Re: Anti-critical-section assertion failure in mcxt.c reached by walsender

Hi,

On 2021-05-07 17:14:18 -0700, Noah Misch wrote:
> Having a flaky buildfarm member is bad news.  I'll LD_PRELOAD the attached to
> prevent fsync from reaching the kernel.  Hopefully, that will make the
> hardware-or-kernel trouble unreachable.  (Changing 008_fsm_truncation.pl
> wouldn't avoid this, because fsync=off doesn't affect syncs outside the
> backend.)

Not sure how reliable that is - there's other paths that could return an
error, I think. If the root cause is the disk responding weirdly to
write cache flushes, you could tell the kernel that that the disk has no
write cache (e.g. echo write through > /sys/block/sda/queue/write_cache).

Greetings,

Andres Freund