could you explain the usage of siglock/PF_EXITING in
cgroup_enable_task_cg_lists() ?
PF_EXITING is protected by cgroup_threadgroup_rwsem, not by
sighand->siglock.
Oleg.
On 10/21, Marco Elver wrote:
>
> On Mon, 21 Oct 2019 at 14:00, Oleg Nesterov wrote:
> >
> > I think this is WONTFIX.
>
> If taking the spinlock is unnecessary (which AFAIK it probably is) and
> there are no other writers to this flag, you will still need a
> WRITE_ONCE(tsk->flags, tsk->flags |
On Mon, Oct 21, 2019 at 02:00:30PM +0200, Oleg Nesterov wrote:
> On 10/21, Christian Brauner wrote:
> >
> > This traces back to Oleg fixing a race between a group stop and a thread
> > exiting before it notices that it has a pending signal or is in the middle
> > of
> > do_exit() already, causing
On Mon, 21 Oct 2019 at 14:00, Oleg Nesterov wrote:
>
> On 10/21, Christian Brauner wrote:
> >
> > This traces back to Oleg fixing a race between a group stop and a thread
> > exiting before it notices that it has a pending signal or is in the middle
> > of
> > do_exit() already, causing group
On 10/21, Christian Brauner wrote:
>
> This traces back to Oleg fixing a race between a group stop and a thread
> exiting before it notices that it has a pending signal or is in the middle of
> do_exit() already, causing group stop to get wacky.
> The original commit to fix this race is
> commit
ve any reproducer for this crash yet.
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+492a4acccd8fc75dd...@syzkaller.appspotmail.com
>
> ==========
> BUG: KCSAN: data-r
-by: syzbot+492a4acccd8fc75dd...@syzkaller.appspotmail.com
==
BUG: KCSAN: data-race in exit_signals / prepare_signal
read to 0x888103566064 of 4 bytes by interrupt on cpu 0:
sig_task_ignored kernel/signal.c:94 [inline]
sig_ignored
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