Re: F14 kernel process loop, possibly in ext4 filesystem code
Michał Piotrowski wrote:
CC'ing kernel list
Regards,
Michal
2010/10/4 Anne & Lynn Wheeler <lynn(a)garlic.com>:
> EXT4 filesystem directory with 100,000+ small files, 4-core intel
> processor, batch process that runs parallel on all four processors
> ... adding/deleting several hundred files.
Let me guess - fsfuzzer? :)
> No problem on F13 but fairly consistently happens since recent
> "preupgrade" to F14. If I serialize the processing, problem
> doesn't occur.
>
> Initial symptom is that batch process doesn't complete and gkrellm
> shows one of the processors at 100% cpu in the kernel. Eventually
> whole system locks up and requires reboot (with manual reset switch).
> Directory will then frequently show numerous newly added files
> as zero bytes (i.e. metadata had been logged, but actual data
> never written to disk).
Is there any actual information about the kernel version, the testcase,
or the failure available?
sysrq-w or sysrq-t would at least show which processes are stuck (former)
and/or where they all are in the callchains (latter)
-Eric