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Re: [Qemu-devel] [Qemu-block] segfault in parallel blockjobs (iotest 30)
From: |
Fam Zheng |
Subject: |
Re: [Qemu-devel] [Qemu-block] segfault in parallel blockjobs (iotest 30) |
Date: |
Fri, 10 Nov 2017 11:02:23 +0800 |
User-agent: |
Mutt/1.9.1 (2017-09-22) |
On Thu, 11/09 17:26, Alberto Garcia wrote:
> On Wed 08 Nov 2017 03:45:38 PM CET, Alberto Garcia wrote:
>
> > I'm thinking that perhaps we should add the pause point directly to
> > block_job_defer_to_main_loop(), to prevent any block job from running
> > the exit function when it's paused.
>
> I was trying this and unfortunately this breaks the mirror job at least
> (reproduced with a simple block-commit on the topmost node, which uses
> commit_active_start() -> mirror_start_job()).
>
> So what happens is that mirror_run() always calls bdrv_drained_begin()
> before returning, pausing the block job. The closing bdrv_drained_end()
> call is at the end of mirror_exit(), already in the main loop.
>
> So the mirror job is always calling block_job_defer_to_main_loop() and
> mirror_exit() when the job is paused.
>
FWIW, I think Max's report on 194 failures is related:
https://lists.gnu.org/archive/html/qemu-devel/2017-11/msg01822.html
so perhaps it's worth testing his patch too:
https://lists.gnu.org/archive/html/qemu-devel/2017-11/msg01835.html
Fam
- [Qemu-devel] segfault in parallel blockjobs (iotest 30), Anton Nefedov, 2017/11/07
- Re: [Qemu-devel] [Qemu-block] segfault in parallel blockjobs (iotest 30), Alberto Garcia, 2017/11/08
- Re: [Qemu-devel] [Qemu-block] segfault in parallel blockjobs (iotest 30), Alberto Garcia, 2017/11/08
- Re: [Qemu-devel] [Qemu-block] segfault in parallel blockjobs (iotest 30), Alberto Garcia, 2017/11/09
- Re: [Qemu-devel] [Qemu-block] segfault in parallel blockjobs (iotest 30),
Fam Zheng <=
- Re: [Qemu-devel] [Qemu-block] segfault in parallel blockjobs (iotest 30), Alberto Garcia, 2017/11/15
- Re: [Qemu-devel] [Qemu-block] segfault in parallel blockjobs (iotest 30), Anton Nefedov, 2017/11/15
- Re: [Qemu-devel] [Qemu-block] segfault in parallel blockjobs (iotest 30), Alberto Garcia, 2017/11/16
- Re: [Qemu-devel] [Qemu-block] segfault in parallel blockjobs (iotest 30), Anton Nefedov, 2017/11/16
- Re: [Qemu-devel] [Qemu-block] segfault in parallel blockjobs (iotest 30), Alberto Garcia, 2017/11/21
- Re: [Qemu-devel] [Qemu-block] segfault in parallel blockjobs (iotest 30), Anton Nefedov, 2017/11/21
- Re: [Qemu-devel] [Qemu-block] segfault in parallel blockjobs (iotest 30), Alberto Garcia, 2017/11/21
- Re: [Qemu-devel] [Qemu-block] segfault in parallel blockjobs (iotest 30), John Snow, 2017/11/21
- Re: [Qemu-devel] [Qemu-block] segfault in parallel blockjobs (iotest 30), Alberto Garcia, 2017/11/22
- Re: [Qemu-devel] [Qemu-block] segfault in parallel blockjobs (iotest 30), John Snow, 2017/11/22