Varun S Nair comments

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                                            Varun S Nair

[Non-repro][Windows 10]:Crash in ZSTD_pthread_cond_broadcast/WakeAllConditionVariable on freeing multi-threaded compression context

@terrelln if we could reproduce this issue at our end, increasing logging would have helped. However we're only getting this from the field. We do have `DEBUGLEVEL` set as `1`...

[Non-repro][Windows 10]:Crash in ZSTD_pthread_cond_broadcast/WakeAllConditionVariable on freeing multi-threaded compression context

Visual Studio 2017 (version 15.9.15) was used for building this. OS on which crash occurred was Windows 10 Pro (version 10.0.18363). I have the full memory dump available, so we...

[Non-repro][Windows 10]:Crash in ZSTD_pthread_cond_broadcast/WakeAllConditionVariable on freeing multi-threaded compression context

Not sure if it is relevant, but we previously found an issue (#1830) where the mutex and condition variable were being overwritten by a `memset` call. Though that doesn't look...

[Non-repro][Windows 10]:Crash in ZSTD_pthread_cond_broadcast/WakeAllConditionVariable on freeing multi-threaded compression context

@terrelln @yoniko unfortunately we were not able to reproduce this issue in-house. We haven't heard about or seen evidence of this issue's occurrence at customer's end in recent times, but...