[BUG] Deadlock when using `DefaultAzureCredential`s and virtual threads are available

**Describe the bug**
When using two or more `DefaultAzureCredential` instances to automatically discover Service Principal credentials from the environment _and_ virtual threads are available and used by the `SharedExecutorService`, making any request (in our case blob storage listing) can lead to a deadlock in retrieving tokens. This is because acquiring a token is **pinning the virtual thread**. With only a few carrier threads available, this is quickly leading to a deadlock where the Azure SDK, and virtual threads in general, become unusable.

***Exception or Stack Trace***
First carrier thread

"ForkJoinPool-1-worker-10" daemon prio=5 tid=416 WAITING

    at jdk.internal.misc.Unsafe.park(Native Method)

    at java.lang.VirtualThread.parkOnCarrierThread()

       local variable: java.lang.VirtualThread#2

       local variable: jdk.internal.event.VirtualThreadPinnedEvent#1

    at java.lang.VirtualThread.park()

       local variable: java.lang.VirtualThread#2

    at java.lang.System$2.parkVirtualThread()

       local variable: java.lang.System$2#1

       local variable: java.lang.VirtualThread#2

       local variable: java.lang.VirtualThread#2

    at jdk.internal.misc.VirtualThreads.park()

    at java.util.concurrent.locks.LockSupport.park()

       local variable: java.lang.VirtualThread#2

    at java.util.concurrent.CompletableFuture$Signaller.block()

       local variable: java.util.concurrent.CompletableFuture$Signaller#1

    at java.util.concurrent.ForkJoinPool.unmanagedBlock()

       local variable: java.util.concurrent.CompletableFuture$Signaller#1

    at java.util.concurrent.ForkJoinPool.managedBlock()

    at java.util.concurrent.CompletableFuture.waitingGet()

       local variable: java.util.concurrent.CompletableFuture#19

       local variable: java.util.concurrent.CompletableFuture$Signaller#1

    at java.util.concurrent.CompletableFuture.get()

       local variable: java.util.concurrent.CompletableFuture#19

    at com.azure.identity.implementation.IdentitySyncClient.authenticateWithConfidentialClientCache(IdentitySyncClient.java:173)

       local variable: com.azure.identity.implementation.IdentitySyncClient#9

       local variable: com.azure.core.credential.TokenRequestContext#3

       local variable: com.microsoft.aad.msal4j.ConfidentialClientApplication#1

       local variable: com.microsoft.aad.msal4j.SilentParameters$SilentParametersBuilder#1

    at com.azure.identity.ClientSecretCredential.getTokenSync(ClientSecretCredential.java:124)

       local variable: com.azure.identity.ClientSecretCredential#3

       local variable: com.azure.core.credential.TokenRequestContext#3

    at com.azure.identity.EnvironmentCredential.getTokenSync(EnvironmentCredential.java:186)

       local variable: com.azure.identity.EnvironmentCredential#3

       local variable: com.azure.core.credential.TokenRequestContext#3

    at com.azure.identity.ChainedTokenCredential.getTokenSync(ChainedTokenCredential.java:130)

       local variable: com.azure.identity.DefaultAzureCredential#3

       local variable: com.azure.core.credential.TokenRequestContext#3

       local variable: java.util.ArrayList#6042

    at com.azure.core.implementation.AccessTokenCache.lambda$new$2(AccessTokenCache.java:65)

       local variable: com.azure.core.implementation.AccessTokenCache#3

       local variable: com.azure.identity.DefaultAzureCredential#3

    at com.azure.core.implementation.AccessTokenCache$$Lambda+0x0000783800f17958.get()

       local variable: com.azure.core.implementation.AccessTokenCache$$Lambda+0x0000783800f17958#3

    at com.azure.core.implementation.AccessTokenCache.lambda$retrieveTokenSync$11(AccessTokenCache.java:230)

       local variable: com.azure.core.implementation.AccessTokenCache#3

       local variable: com.azure.core.credential.TokenRequestContext#1

       local variable: com.azure.core.implementation.AccessTokenCacheInfo#3

       local variable: com.azure.identity.implementation.MsalToken#2

       local variable: java.time.OffsetDateTime#4

       local variable: com.azure.core.implementation.AccessTokenCache$$Lambda+0x0000783800f17958#3

       local variable: com.azure.identity.implementation.MsalToken#2

    at com.azure.core.implementation.AccessTokenCache$$Lambda+0x0000783801368d40.get()

       local variable: com.azure.core.implementation.AccessTokenCache$$Lambda+0x0000783801368d40#1

    at com.azure.core.implementation.AccessTokenCache.getTokenSync(AccessTokenCache.java:93)

       local variable: com.azure.core.implementation.AccessTokenCache#3

       local variable: com.azure.core.credential.TokenRequestContext#1

    at com.azure.core.http.policy.BearerTokenAuthenticationPolicy.setAuthorizationHeaderHelperSync(BearerTokenAuthenticationPolicy.java:220)

       local variable: com.azure.storage.common.policy.StorageBearerTokenChallengeAuthorizationPolicy#3

       local variable: com.azure.core.http.HttpPipelineCallContext#1

       local variable: com.azure.core.credential.TokenRequestContext#1

    at com.azure.core.http.policy.BearerTokenAuthenticationPolicy.setAuthorizationHeaderSync(BearerTokenAuthenticationPolicy.java:207)

       local variable: com.azure.storage.common.policy.StorageBearerTokenChallengeAuthorizationPolicy#3

       local variable: com.azure.core.http.HttpPipelineCallContext#1

       local variable: com.azure.core.credential.TokenRequestContext#1

    at com.azure.storage.common.policy.StorageBearerTokenChallengeAuthorizationPolicy.authorizeRequestSync(StorageBearerTokenChallengeAuthorizationPolicy.java:63)

       local variable: com.azure.storage.common.policy.StorageBearerTokenChallengeAuthorizationPolicy#3

       local variable: com.azure.core.http.HttpPipelineCallContext#1

       local variable: java.lang.String[]#1260

    at com.azure.core.http.policy.BearerTokenAuthenticationPolicy.processSync(BearerTokenAuthenticationPolicy.java:174)

       local variable: com.azure.storage.common.policy.StorageBearerTokenChallengeAuthorizationPolicy#3

       local variable: com.azure.core.http.HttpPipelineCallContext#1

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#1

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#2

    at com.azure.core.http.HttpPipelineNextSyncPolicy.processSync(HttpPipelineNextSyncPolicy.java:53)

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#1

       local variable: com.azure.storage.common.policy.StorageBearerTokenChallengeAuthorizationPolicy#3

    at com.azure.storage.common.policy.MetadataValidationPolicy.processSync(MetadataValidationPolicy.java:42)

       local variable: com.azure.storage.common.policy.MetadataValidationPolicy#3

       local variable: com.azure.core.http.HttpPipelineCallContext#1

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#1

    at com.azure.core.http.HttpPipelineNextSyncPolicy.processSync(HttpPipelineNextSyncPolicy.java:53)

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#1

       local variable: com.azure.storage.common.policy.MetadataValidationPolicy#3

    at com.azure.core.http.policy.AddHeadersFromContextPolicy.processSync(AddHeadersFromContextPolicy.java:67)

       local variable: com.azure.core.http.policy.AddHeadersFromContextPolicy#3

       local variable: com.azure.core.http.HttpPipelineCallContext#1

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#1

    at com.azure.core.http.HttpPipelineNextSyncPolicy.processSync(HttpPipelineNextSyncPolicy.java:53)

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#1

       local variable: com.azure.core.http.policy.AddHeadersFromContextPolicy#3

    at com.azure.core.http.policy.AddDatePolicy.processSync(AddDatePolicy.java:50)

       local variable: com.azure.core.http.policy.AddDatePolicy#3

       local variable: com.azure.core.http.HttpPipelineCallContext#1

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#1

    at com.azure.core.http.HttpPipelineNextSyncPolicy.processSync(HttpPipelineNextSyncPolicy.java:53)

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#1

       local variable: com.azure.core.http.policy.AddDatePolicy#3

    at com.azure.storage.common.policy.RequestRetryPolicy.lambda$attemptSync$2(RequestRetryPolicy.java:261)

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#3

    at com.azure.storage.common.policy.RequestRetryPolicy$$Lambda+0x0000783801366eb0.call()

       local variable: com.azure.storage.common.policy.RequestRetryPolicy$$Lambda+0x0000783801366eb0#1

    at reactor.core.publisher.MonoCallable.block(MonoCallable.java:62)

       local variable: reactor.core.publisher.MonoCallable#15

       local variable: java.time.Duration#229

    at reactor.core.publisher.MonoCallable.block(MonoCallable.java:55)

       local variable: reactor.core.publisher.MonoCallable#15

    at com.azure.storage.common.policy.RequestRetryPolicy.attemptSync(RequestRetryPolicy.java:270)

       local variable: com.azure.storage.common.policy.RequestRetryPolicy#3

       local variable: com.azure.core.http.HttpPipelineCallContext#1

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#3

       local variable: com.azure.core.http.HttpRequest#3

       local variable: reactor.core.publisher.MonoCallable#15

    at com.azure.storage.common.policy.RequestRetryPolicy.processSync(RequestRetryPolicy.java:71)

       local variable: com.azure.storage.common.policy.RequestRetryPolicy#3

       local variable: com.azure.core.http.HttpPipelineCallContext#1

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#3

       local variable: com.azure.core.http.HttpRequest#3

    at com.azure.core.http.HttpPipelineNextSyncPolicy.processSync(HttpPipelineNextSyncPolicy.java:53)

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#3

       local variable: com.azure.storage.common.policy.RequestRetryPolicy#3

    at com.azure.core.http.policy.RequestIdPolicy.processSync(RequestIdPolicy.java:77)

       local variable: com.azure.core.http.policy.RequestIdPolicy#3

       local variable: com.azure.core.http.HttpPipelineCallContext#1

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#3

    at com.azure.core.http.HttpPipelineNextSyncPolicy.processSync(HttpPipelineNextSyncPolicy.java:53)

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#3

       local variable: com.azure.core.http.policy.RequestIdPolicy#3

    at com.azure.core.http.policy.HttpPipelineSyncPolicy.processSync(HttpPipelineSyncPolicy.java:51)

       local variable: com.azure.core.http.policy.UserAgentPolicy$1#4

       local variable: com.azure.core.http.HttpPipelineCallContext#1

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#3

    at com.azure.core.http.policy.UserAgentPolicy.processSync(UserAgentPolicy.java:174)

       local variable: com.azure.core.http.policy.UserAgentPolicy#4

       local variable: com.azure.core.http.HttpPipelineCallContext#1

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#3

    at com.azure.core.http.HttpPipelineNextSyncPolicy.processSync(HttpPipelineNextSyncPolicy.java:53)

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#3

       local variable: com.azure.core.http.policy.UserAgentPolicy#4

    at com.azure.core.http.HttpPipeline.sendSync(HttpPipeline.java:138)

       local variable: com.azure.core.http.HttpPipeline#3

       local variable: com.azure.core.http.HttpRequest#3

       local variable: com.azure.core.util.Context#7

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#3

    at com.azure.core.implementation.http.rest.SyncRestProxy.send(SyncRestProxy.java:62)

       local variable: com.azure.core.implementation.http.rest.SyncRestProxy#26

       local variable: com.azure.core.http.HttpRequest#3

       local variable: com.azure.core.util.Context#7

    at com.azure.core.implementation.http.rest.SyncRestProxy.invoke(SyncRestProxy.java:83)

       local variable: com.azure.core.implementation.http.rest.SyncRestProxy#26

       local variable: jdk.proxy2.$Proxy213#5

       local variable: java.lang.reflect.Method#8034

       local variable: com.azure.core.implementation.http.rest.SwaggerMethodParser#2

       local variable: com.azure.core.http.HttpRequest#3

       local variable: com.azure.core.util.Context#7

       local variable: com.azure.core.util.tracing.Utils$$Lambda+0x000078380135f268#1

    at com.azure.core.implementation.http.rest.RestProxyBase.invoke(RestProxyBase.java:124)

       local variable: com.azure.core.implementation.http.rest.SyncRestProxy#26

       local variable: jdk.proxy2.$Proxy213#5

       local variable: java.lang.reflect.Method#8034

       local variable: com.azure.core.implementation.http.rest.SwaggerMethodParser#2

       local variable: java.lang.Object[]#9601

       local variable: com.azure.core.http.HttpRequest#3

       local variable: com.azure.core.util.Context#7

    at com.azure.core.http.rest.RestProxy.invoke(RestProxy.java:95)

       local variable: com.azure.core.http.rest.RestProxy#26

       local variable: jdk.proxy2.$Proxy213#5

       local variable: java.lang.reflect.Method#8034

       local variable: java.lang.Object[]#9601

       local variable: com.azure.core.implementation.http.rest.SwaggerMethodParser#2

       local variable: com.azure.core.util.Context$1#1

    at jdk.proxy2.$Proxy213.listBlobFlatSegmentSync()

       local variable: jdk.proxy2.$Proxy213#5

       local variable: java.lang.String#70505

       local variable: java.lang.String#102455

       local variable: java.lang.String#169761

       local variable: java.lang.String#84991

       local variable: java.lang.String#39616

       local variable: java.lang.String#102453

       local variable: java.lang.String#139122

       local variable: com.azure.core.util.Context$1#1

    at com.azure.storage.blob.implementation.ContainersImpl.listBlobFlatSegmentWithResponse(ContainersImpl.java:5959)

       local variable: com.azure.storage.blob.implementation.ContainersImpl#5

       local variable: java.lang.String#102455

       local variable: java.lang.String#39616

       local variable: com.azure.core.util.Context$1#1

       local variable: java.lang.String#169761

       local variable: java.lang.String#84991

       local variable: java.lang.String#139122

    at com.azure.storage.blob.BlobContainerClient.lambda$listBlobs$6(BlobContainerClient.java:1046)

       local variable: com.azure.storage.blob.BlobContainerClient#5

       local variable: com.azure.storage.blob.models.ListBlobsOptions#1

    at com.azure.storage.blob.BlobContainerClient$$Lambda+0x0000783801537760.call()

       local variable: com.azure.storage.blob.BlobContainerClient$$Lambda+0x0000783801537760#1

    at com.azure.storage.common.implementation.StorageImplUtils.sendRequest(StorageImplUtils.java:494)

       local variable: com.azure.storage.blob.BlobContainerClient$$Lambda+0x0000783801537760#1

       local variable: class com.azure.storage.blob.models.BlobStorageException

    at com.azure.storage.blob.BlobContainerClient.lambda$listBlobs$7(BlobContainerClient.java:1050)

       local variable: com.azure.storage.blob.BlobContainerClient#5

       local variable: com.azure.storage.blob.models.ListBlobsOptions#2

       local variable: com.azure.storage.blob.models.ListBlobsOptions#1

       local variable: com.azure.storage.blob.BlobContainerClient$$Lambda+0x0000783801537760#1

    at com.azure.storage.blob.BlobContainerClient$$Lambda+0x0000783801534938.apply()

       local variable: com.azure.storage.blob.BlobContainerClient$$Lambda+0x0000783801534938#1

    at com.azure.storage.blob.BlobContainerClient.lambda$listBlobs$8(BlobContainerClient.java:1065)

       local variable: com.azure.storage.blob.BlobContainerClient$$Lambda+0x0000783801534938#1

    at com.azure.storage.blob.BlobContainerClient$$Lambda+0x0000783801536170.apply()

       local variable: com.azure.storage.blob.BlobContainerClient$$Lambda+0x0000783801536170#1

    at com.azure.core.http.rest.PagedIterable.lambda$new$5(PagedIterable.java:193)

       local variable: com.azure.storage.blob.BlobContainerClient$$Lambda+0x0000783801536170#1

       local variable: com.azure.storage.blob.BlobContainerClient$$Lambda+0x0000783801534938#1

    at com.azure.core.http.rest.PagedIterable$$Lambda+0x0000783801536e40.getPage()

       local variable: com.azure.core.http.rest.PagedIterable$$Lambda+0x0000783801536e40#1

    at com.azure.core.util.paging.ContinuablePagedByIteratorBase.requestPage(ContinuablePagedByIteratorBase.java:104)

       local variable: com.azure.core.util.paging.ContinuablePagedByItemIterable$ContinuablePagedByItemIterator#1

       local variable: java.util.concurrent.atomic.AtomicBoolean#270

    at com.azure.core.util.paging.ContinuablePagedByItemIterable$ContinuablePagedByItemIterator.(ContinuablePagedByItemIterable.java:83)

       local variable: com.azure.core.util.paging.ContinuablePagedByItemIterable$ContinuablePagedByItemIterator#1

       local variable: com.azure.core.http.rest.PagedIterable$$Lambda+0x0000783801536e40#1

       local variable: com.azure.core.http.rest.PagedIterableBase$$Lambda+0x00007838015367b0#1

    at com.azure.core.util.paging.ContinuablePagedByItemIterable.iterator(ContinuablePagedByItemIterable.java:58)

       local variable: com.azure.core.util.paging.ContinuablePagedByItemIterable#1

       local variable: com.azure.core.util.paging.ContinuablePagedByItemIterable$ContinuablePagedByItemIterator#1

    at java.lang.Iterable.spliterator()

    at com.azure.core.util.paging.ContinuablePagedIterable.stream(ContinuablePagedIterable.java:85)

       local variable: com.azure.core.http.rest.PagedIterable#1

Second carrier thread

"ForkJoinPool-1-worker-9" daemon prio=5 tid=417 WAITING

    at jdk.internal.misc.Unsafe.park(Native Method)

    at java.lang.VirtualThread.parkOnCarrierThread()

       local variable: java.lang.VirtualThread#3

       local variable: jdk.internal.event.VirtualThreadPinnedEvent#2

    at java.lang.VirtualThread.park()

       local variable: java.lang.VirtualThread#3

    at java.lang.System$2.parkVirtualThread()

       local variable: java.lang.System$2#1

       local variable: java.lang.VirtualThread#3

       local variable: java.lang.VirtualThread#3

    at jdk.internal.misc.VirtualThreads.park()

    at java.util.concurrent.locks.LockSupport.park()

       local variable: java.lang.VirtualThread#3

    at java.util.concurrent.CompletableFuture$Signaller.block()

       local variable: java.util.concurrent.CompletableFuture$Signaller#2

    at java.util.concurrent.ForkJoinPool.unmanagedBlock()

       local variable: java.util.concurrent.CompletableFuture$Signaller#2

    at java.util.concurrent.ForkJoinPool.managedBlock()

    at java.util.concurrent.CompletableFuture.waitingGet()

       local variable: java.util.concurrent.CompletableFuture#21

       local variable: java.util.concurrent.CompletableFuture$Signaller#2

    at java.util.concurrent.CompletableFuture.get()

       local variable: java.util.concurrent.CompletableFuture#21

    at com.azure.identity.implementation.IdentitySyncClient.authenticateWithConfidentialClientCache(IdentitySyncClient.java:173)

       local variable: com.azure.identity.implementation.IdentitySyncClient#18

       local variable: com.azure.core.credential.TokenRequestContext#4

       local variable: com.microsoft.aad.msal4j.ConfidentialClientApplication#2

       local variable: com.microsoft.aad.msal4j.SilentParameters$SilentParametersBuilder#2

    at com.azure.identity.ClientSecretCredential.getTokenSync(ClientSecretCredential.java:124)

       local variable: com.azure.identity.ClientSecretCredential#6

       local variable: com.azure.core.credential.TokenRequestContext#4

    at com.azure.identity.EnvironmentCredential.getTokenSync(EnvironmentCredential.java:186)

       local variable: com.azure.identity.EnvironmentCredential#6

       local variable: com.azure.core.credential.TokenRequestContext#4

    at com.azure.identity.ChainedTokenCredential.getTokenSync(ChainedTokenCredential.java:130)

       local variable: com.azure.identity.DefaultAzureCredential#6

       local variable: com.azure.core.credential.TokenRequestContext#4

       local variable: java.util.ArrayList#6043

    at com.azure.core.implementation.AccessTokenCache.lambda$new$2(AccessTokenCache.java:65)

       local variable: com.azure.core.implementation.AccessTokenCache#6

       local variable: com.azure.identity.DefaultAzureCredential#6

    at com.azure.core.implementation.AccessTokenCache$$Lambda+0x0000783800f17958.get()

       local variable: com.azure.core.implementation.AccessTokenCache$$Lambda+0x0000783800f17958#6

    at com.azure.core.implementation.AccessTokenCache.lambda$retrieveTokenSync$11(AccessTokenCache.java:230)

       local variable: com.azure.core.implementation.AccessTokenCache#6

       local variable: com.azure.core.credential.TokenRequestContext#2

       local variable: com.azure.core.implementation.AccessTokenCacheInfo#4

       local variable: com.azure.identity.implementation.MsalToken#1

       local variable: java.time.OffsetDateTime#5

       local variable: com.azure.core.implementation.AccessTokenCache$$Lambda+0x0000783800f17958#6

       local variable: com.azure.identity.implementation.MsalToken#1

    at com.azure.core.implementation.AccessTokenCache$$Lambda+0x0000783801368d40.get()

       local variable: com.azure.core.implementation.AccessTokenCache$$Lambda+0x0000783801368d40#2

    at com.azure.core.implementation.AccessTokenCache.getTokenSync(AccessTokenCache.java:93)

       local variable: com.azure.core.implementation.AccessTokenCache#6

       local variable: com.azure.core.credential.TokenRequestContext#2

    at com.azure.core.http.policy.BearerTokenAuthenticationPolicy.setAuthorizationHeaderHelperSync(BearerTokenAuthenticationPolicy.java:220)

       local variable: com.azure.storage.common.policy.StorageBearerTokenChallengeAuthorizationPolicy#6

       local variable: com.azure.core.http.HttpPipelineCallContext#2

       local variable: com.azure.core.credential.TokenRequestContext#2

    at com.azure.core.http.policy.BearerTokenAuthenticationPolicy.setAuthorizationHeaderSync(BearerTokenAuthenticationPolicy.java:207)

       local variable: com.azure.storage.common.policy.StorageBearerTokenChallengeAuthorizationPolicy#6

       local variable: com.azure.core.http.HttpPipelineCallContext#2

       local variable: com.azure.core.credential.TokenRequestContext#2

    at com.azure.storage.common.policy.StorageBearerTokenChallengeAuthorizationPolicy.authorizeRequestSync(StorageBearerTokenChallengeAuthorizationPolicy.java:63)

       local variable: com.azure.storage.common.policy.StorageBearerTokenChallengeAuthorizationPolicy#6

       local variable: com.azure.core.http.HttpPipelineCallContext#2

       local variable: java.lang.String[]#1261

    at com.azure.core.http.policy.BearerTokenAuthenticationPolicy.processSync(BearerTokenAuthenticationPolicy.java:174)

       local variable: com.azure.storage.common.policy.StorageBearerTokenChallengeAuthorizationPolicy#6

       local variable: com.azure.core.http.HttpPipelineCallContext#2

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#4

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#5

    at com.azure.core.http.HttpPipelineNextSyncPolicy.processSync(HttpPipelineNextSyncPolicy.java:53)

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#4

       local variable: com.azure.storage.common.policy.StorageBearerTokenChallengeAuthorizationPolicy#6

    at com.azure.storage.common.policy.MetadataValidationPolicy.processSync(MetadataValidationPolicy.java:42)

       local variable: com.azure.storage.common.policy.MetadataValidationPolicy#6

       local variable: com.azure.core.http.HttpPipelineCallContext#2

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#4

    at com.azure.core.http.HttpPipelineNextSyncPolicy.processSync(HttpPipelineNextSyncPolicy.java:53)

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#4

       local variable: com.azure.storage.common.policy.MetadataValidationPolicy#6

    at com.azure.core.http.policy.AddHeadersFromContextPolicy.processSync(AddHeadersFromContextPolicy.java:67)

       local variable: com.azure.core.http.policy.AddHeadersFromContextPolicy#6

       local variable: com.azure.core.http.HttpPipelineCallContext#2

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#4

    at com.azure.core.http.HttpPipelineNextSyncPolicy.processSync(HttpPipelineNextSyncPolicy.java:53)

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#4

       local variable: com.azure.core.http.policy.AddHeadersFromContextPolicy#6

    at com.azure.core.http.policy.AddDatePolicy.processSync(AddDatePolicy.java:50)

       local variable: com.azure.core.http.policy.AddDatePolicy#6

       local variable: com.azure.core.http.HttpPipelineCallContext#2

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#4

    at com.azure.core.http.HttpPipelineNextSyncPolicy.processSync(HttpPipelineNextSyncPolicy.java:53)

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#4

       local variable: com.azure.core.http.policy.AddDatePolicy#6

    at com.azure.storage.common.policy.RequestRetryPolicy.lambda$attemptSync$2(RequestRetryPolicy.java:261)

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#6

    at com.azure.storage.common.policy.RequestRetryPolicy$$Lambda+0x0000783801366eb0.call()

       local variable: com.azure.storage.common.policy.RequestRetryPolicy$$Lambda+0x0000783801366eb0#2

    at reactor.core.publisher.MonoCallable.block(MonoCallable.java:62)

       local variable: reactor.core.publisher.MonoCallable#16

       local variable: java.time.Duration#229

    at reactor.core.publisher.MonoCallable.block(MonoCallable.java:55)

       local variable: reactor.core.publisher.MonoCallable#16

    at com.azure.storage.common.policy.RequestRetryPolicy.attemptSync(RequestRetryPolicy.java:270)

       local variable: com.azure.storage.common.policy.RequestRetryPolicy#6

       local variable: com.azure.core.http.HttpPipelineCallContext#2

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#6

       local variable: com.azure.core.http.HttpRequest#4

       local variable: reactor.core.publisher.MonoCallable#16

    at com.azure.storage.common.policy.RequestRetryPolicy.processSync(RequestRetryPolicy.java:71)

       local variable: com.azure.storage.common.policy.RequestRetryPolicy#6

       local variable: com.azure.core.http.HttpPipelineCallContext#2

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#6

       local variable: com.azure.core.http.HttpRequest#4

    at com.azure.core.http.HttpPipelineNextSyncPolicy.processSync(HttpPipelineNextSyncPolicy.java:53)

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#6

       local variable: com.azure.storage.common.policy.RequestRetryPolicy#6

    at com.azure.core.http.policy.RequestIdPolicy.processSync(RequestIdPolicy.java:77)

       local variable: com.azure.core.http.policy.RequestIdPolicy#6

       local variable: com.azure.core.http.HttpPipelineCallContext#2

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#6

    at com.azure.core.http.HttpPipelineNextSyncPolicy.processSync(HttpPipelineNextSyncPolicy.java:53)

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#6

       local variable: com.azure.core.http.policy.RequestIdPolicy#6

    at com.azure.core.http.policy.HttpPipelineSyncPolicy.processSync(HttpPipelineSyncPolicy.java:51)

       local variable: com.azure.core.http.policy.UserAgentPolicy$1#8

       local variable: com.azure.core.http.HttpPipelineCallContext#2

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#6

    at com.azure.core.http.policy.UserAgentPolicy.processSync(UserAgentPolicy.java:174)

       local variable: com.azure.core.http.policy.UserAgentPolicy#8

       local variable: com.azure.core.http.HttpPipelineCallContext#2

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#6

    at com.azure.core.http.HttpPipelineNextSyncPolicy.processSync(HttpPipelineNextSyncPolicy.java:53)

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#6

       local variable: com.azure.core.http.policy.UserAgentPolicy#8

    at com.azure.core.http.HttpPipeline.sendSync(HttpPipeline.java:138)

       local variable: com.azure.core.http.HttpPipeline#7

       local variable: com.azure.core.http.HttpRequest#4

       local variable: com.azure.core.util.Context#8

       local variable: com.azure.core.http.HttpPipelineNextSyncPolicy#6

    at com.azure.core.implementation.http.rest.SyncRestProxy.send(SyncRestProxy.java:62)

       local variable: com.azure.core.implementation.http.rest.SyncRestProxy#32

       local variable: com.azure.core.http.HttpRequest#4

       local variable: com.azure.core.util.Context#8

    at com.azure.core.implementation.http.rest.SyncRestProxy.invoke(SyncRestProxy.java:83)

       local variable: com.azure.core.implementation.http.rest.SyncRestProxy#32

       local variable: jdk.proxy2.$Proxy213#6

       local variable: java.lang.reflect.Method#8034

       local variable: com.azure.core.implementation.http.rest.SwaggerMethodParser#2

       local variable: com.azure.core.http.HttpRequest#4

       local variable: com.azure.core.util.Context#8

       local variable: com.azure.core.util.tracing.Utils$$Lambda+0x000078380135f268#1

    at com.azure.core.implementation.http.rest.RestProxyBase.invoke(RestProxyBase.java:124)

       local variable: com.azure.core.implementation.http.rest.SyncRestProxy#32

       local variable: jdk.proxy2.$Proxy213#6

       local variable: java.lang.reflect.Method#8034

       local variable: com.azure.core.implementation.http.rest.SwaggerMethodParser#2

       local variable: java.lang.Object[]#9605

       local variable: com.azure.core.http.HttpRequest#4

       local variable: com.azure.core.util.Context#8

    at com.azure.core.http.rest.RestProxy.invoke(RestProxy.java:95)

       local variable: com.azure.core.http.rest.RestProxy#32

       local variable: jdk.proxy2.$Proxy213#6

       local variable: java.lang.reflect.Method#8034

       local variable: java.lang.Object[]#9605

       local variable: com.azure.core.implementation.http.rest.SwaggerMethodParser#2

       local variable: com.azure.core.util.Context$1#1

    at jdk.proxy2.$Proxy213.listBlobFlatSegmentSync()

       local variable: jdk.proxy2.$Proxy213#6

       local variable: java.lang.String#182829

       local variable: java.lang.String#102455

       local variable: java.lang.String#169761

       local variable: java.lang.String#84991

       local variable: java.lang.String#39623

       local variable: java.lang.String#102453

       local variable: java.lang.String#139122

       local variable: com.azure.core.util.Context$1#1

    at com.azure.storage.blob.implementation.ContainersImpl.listBlobFlatSegmentWithResponse(ContainersImpl.java:5959)

       local variable: com.azure.storage.blob.implementation.ContainersImpl#6

       local variable: java.lang.String#102455

       local variable: java.lang.String#39623

       local variable: com.azure.core.util.Context$1#1

       local variable: java.lang.String#169761

       local variable: java.lang.String#84991

       local variable: java.lang.String#139122

    at com.azure.storage.blob.BlobContainerClient.lambda$listBlobs$6(BlobContainerClient.java:1046)

       local variable: com.azure.storage.blob.BlobContainerClient#6

       local variable: com.azure.storage.blob.models.ListBlobsOptions#3

    at com.azure.storage.blob.BlobContainerClient$$Lambda+0x0000783801537760.call()

       local variable: com.azure.storage.blob.BlobContainerClient$$Lambda+0x0000783801537760#2

    at com.azure.storage.common.implementation.StorageImplUtils.sendRequest(StorageImplUtils.java:494)

       local variable: com.azure.storage.blob.BlobContainerClient$$Lambda+0x0000783801537760#2

       local variable: class com.azure.storage.blob.models.BlobStorageException

    at com.azure.storage.blob.BlobContainerClient.lambda$listBlobs$7(BlobContainerClient.java:1050)

       local variable: com.azure.storage.blob.BlobContainerClient#6

       local variable: com.azure.storage.blob.models.ListBlobsOptions#4

       local variable: com.azure.storage.blob.models.ListBlobsOptions#3

       local variable: com.azure.storage.blob.BlobContainerClient$$Lambda+0x0000783801537760#2

    at com.azure.storage.blob.BlobContainerClient$$Lambda+0x0000783801534938.apply()

       local variable: com.azure.storage.blob.BlobContainerClient$$Lambda+0x0000783801534938#2

    at com.azure.storage.blob.BlobContainerClient.lambda$listBlobs$8(BlobContainerClient.java:1065)

       local variable: com.azure.storage.blob.BlobContainerClient$$Lambda+0x0000783801534938#2

    at com.azure.storage.blob.BlobContainerClient$$Lambda+0x0000783801536170.apply()

       local variable: com.azure.storage.blob.BlobContainerClient$$Lambda+0x0000783801536170#2

    at com.azure.core.http.rest.PagedIterable.lambda$new$5(PagedIterable.java:193)

       local variable: com.azure.storage.blob.BlobContainerClient$$Lambda+0x0000783801536170#2

       local variable: com.azure.storage.blob.BlobContainerClient$$Lambda+0x0000783801534938#2

    at com.azure.core.http.rest.PagedIterable$$Lambda+0x0000783801536e40.getPage()

       local variable: com.azure.core.http.rest.PagedIterable$$Lambda+0x0000783801536e40#2

    at com.azure.core.util.paging.ContinuablePagedByIteratorBase.requestPage(ContinuablePagedByIteratorBase.java:104)

       local variable: com.azure.core.util.paging.ContinuablePagedByItemIterable$ContinuablePagedByItemIterator#2

       local variable: java.util.concurrent.atomic.AtomicBoolean#271

    at com.azure.core.util.paging.ContinuablePagedByItemIterable$ContinuablePagedByItemIterator.(ContinuablePagedByItemIterable.java:83)

       local variable: com.azure.core.util.paging.ContinuablePagedByItemIterable$ContinuablePagedByItemIterator#2

       local variable: com.azure.core.http.rest.PagedIterable$$Lambda+0x0000783801536e40#2

       local variable: com.azure.core.http.rest.PagedIterableBase$$Lambda+0x00007838015367b0#1

    at com.azure.core.util.paging.ContinuablePagedByItemIterable.iterator(ContinuablePagedByItemIterable.java:58)

       local variable: com.azure.core.util.paging.ContinuablePagedByItemIterable#2

       local variable: com.azure.core.util.paging.ContinuablePagedByItemIterable$ContinuablePagedByItemIterator#2

    at java.lang.Iterable.spliterator()

    at com.azure.core.util.paging.ContinuablePagedIterable.stream(ContinuablePagedIterable.java:85)

       local variable: com.azure.core.http.rest.PagedIterable#2

The heap dump shows multiple virtual threads. `azure-sdk-global-thread-5` and `azure-sdk-global-thread-4` are started but don't have a carrier thread yet. Thread `#415` and `#416` are the threads from above that are pinned to their carrier threads.

**To Reproduce**
Steps to reproduce the behavior:
- Have virtual threads available
- Have few CPUs available, leading to a small number of carrier threads
- Have multiple `DefaultAzureCredential` instances
- Make multiple concurrent request that need to retrieve a new token from the credential chain

This is the scenario that leads to fairly reliable deadlocks. I'm not actually sure if multiple `DefaultAzureCredential` instances are required or not, or even if the issue would also occur when using one of the authentication methods explicitly.

**Expected behavior**
No deadlocks. The Azure SDK should not use virtual threads if it pins them by using `synchronized` or calling into native code.

**Setup (please complete the following information):**
- OS: Linux
- Library/Libraries: Azure SDK 1.2.36
- Java version: 21

**Information Checklist**
Kindly make sure that you have added all the following information above and checkoff the required fields otherwise we will treat the issuer as an incomplete report
- [x] Bug Description Added
- [x] Repro Steps Added
- [x] Setup information Added