DynamoRIO / DynamoRIO/drmemory
uninit in NtContinue at init on GA CI
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Description
This showed up in a mallocMD run once on GA CI:
https://github.com/DynamoRIO/drmemory/pull/2360/checks?check_run_id=1714548633
```
2021-01-16T19:19:52.8495990Z 48/118 Test #48: mallocMD ..........................***Failed 4.67 sec
2021-01-16T19:19:52.8414391Z 48: CMake Error at runtest.cmake:572 (message):
2021-01-16T19:19:52.8415046Z 48: stderr failed to match "~~Dr\.M~~ 2 unique, 2 total uninitialized
2021-01-16T19:19:52.8415793Z 48: access\(es\)", found "~~Dr.M~~ 3 unique, 3 total uninitialized access(es)"
2021-01-16T19:19:52.8416349Z 48: instead
2021-01-16T19:19:52.8348663Z 48: Error #1: UNINITIALIZED READ: reading register r10
2021-01-16T19:19:52.8349292Z 48: # 0 system call NtContinue parameter value #0
2021-01-16T19:19:52.8349817Z 48:
2021-01-16T19:19:52.8350461Z 48: # 1 ntdll.dll!LdrInitializeThunk (0x00007ffa6c707cb8 )
2021-01-16T19:19:52.8351202Z 48: ??:0
2021-01-16T19:19:52.8352400Z 48: Note: @0:00:00.228 in thread 1548
```
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