Re: [PATCH v8 1/2] fsstress: add mwrite/mread into test operation list

[Eryu Guan <eguan@redhat.com>]

On Thu, Mar 23, 2017 at 04:10:26PM +0800, Zorro Lang wrote:
> mmap as a popular and basic operation, most of softwares use it to
> access files. More and more customers report bugs related with
> mmap/munmap and other stress conditions.
> 
> So add mmap read/write test into fsstress to increase mmap related
> stress to reproduce or find more bugs easily.
> 
> Signed-off-by: Zorro Lang <zlang@redhat.com>

generic/270 failed in my release testing because fsstress processes
exited early than expected and killall complained no process to kill.

+/tmp/4881.fsstress.bin: no process found

This is because mwrite would trigger SIGBUS if it's writing to a mmap'ed
hole and there's no space left on device, so fsstress processes are
killed by SIGBUS.

Perhaps SIGBUS should be caught and handled so that fsstress won't be
killed. I'll drop this patchset for now.

Thanks,
Eryu
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