TiFlash v7.1.6 panic when running `br restore`

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

Using br restore command to restore a chbenchmark 1500 database with TiFlash replica. There are already more than 4 TiB storage used on TiFlash instance.

2. What did you expect to see? (Required)

br restore run successfully and TiFlash replica are restored successfully too.

3. What did you see instead (Required)

During the br restore, TiFlash happen to a panic with stacktrace as follow. TiFlash panic repeatedly after this error happened.

[2025/04/23 07:09:53.408 +00:00] [FATAL] [lib.rs:497] ["[region 181708757] 181708761 ingest uuid: ? range { start: ? end: ? } length: 7104738 cf_name: \"write\" region_id: 181708757 region_epoch { conf_ver: 86 version: 2168 } cipher_iv: ?: EngineTraits(Engine(Status { code: IoError, sub_code: None, sev: NoError, state: \"IO error: No such file or directory: while stat a file for size: /data0/proxy/import/54c46afb-667d-4bd0-b8f2-68ef1c87e92f_181708757_86_2168_write.sst: No such file or directory\" }))"] [backtrace="   0: tikv_util::set_panic_hook::{{closure}}\n   1: std::panicking::rust_panic_with_hook\n   2: std::panicking::begin_panic_handler::{{closure}}\n   3: std::sys_common::backtrace::__rust_end_short_backtrace\n   4: rust_begin_unwind\n   5: core::panicking::panic_fmt\n   6: raftstore::store::fsm::apply::ApplyDelegate<EK>::apply_raft_cmd\n   7: raftstore::store::fsm::apply::ApplyDelegate<EK>::process_raft_cmd\n   8: raftstore::store::fsm::apply::ApplyDelegate<EK>::handle_raft_committed_entries\n   9: <raftstore::store::fsm::apply::ApplyPoller<EK> as batch_system::batch::PollHandler<raftstore::store::fsm::apply::ApplyFsm<EK>,raftstore::store::fsm::apply::ControlFsm>>::handle_normal\n  10: batch_system::batch::Poller<N,C,Handler>::poll\n  11: std::sys_common::backtrace::__rust_begin_short_backtrace\n  12: core::ops::function::FnOnce::call_once{{vtable.shim}}\n  13: std::sys::unix::thread::Thread::new::thread_start\n  14: start_thread\n  15: thread_start\n"] [location=/workspace/source/tiflash/contrib/tiflash-proxy/components/raftstore/src/store/fsm/apply.rs:2005] [thread_name=apply-low-5]

4. What is your TiFlash version? (Required)

v7.1.6

Start with the panic location at tiflash-proxy/components/raftstore/src/store/fsm/apply.rs:2005 and inspect the reported missing .sst file during a br restore. Reproduce the restore against TiFlash v7.1.6 with a TiFlash replica and verify that TiFlash no longer panics repeatedly and the replica restores successfully.