Yanqin Jin 6a76008369 Fix TSAN caused by calling rend() and pop_front(). (#9698)
Summary:
PR9686 makes `WriteToWAL()` call `assert(...!=rend())` while not holding
db mutex or log mutex. Another thread may concurrently call
`pop_front()`, causing race condition.
To fix, assert only if mutex is held.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9698

Test Plan: COMPILE_WITH_TSAN=1 make check

Reviewed By: jay-zhuang

Differential Revision: D34898535

Pulled By: riversand963

fbshipit-source-id: 1ddfa5bf1b6ae8d409cab6ff6e1b5321c6803da9
2022-03-15 12:16:40 -07:00
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