Messages in this thread | | | Date | Wed, 23 Nov 2022 23:06:48 +0100 | From | Frederic Weisbecker <> | Subject | Re: PID_NS unshare VS synchronize_rcu_tasks() (was: Re: [Syzkaller & bisect] There is task hung in "synchronize_rcu" in v6.1-rc5 kernel) |
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On Wed, Nov 23, 2022 at 11:45:50PM +0800, Pengfei Xu wrote: > On 2022-11-23 at 15:37:58 +0100, Frederic Weisbecker wrote: > > I have no idea how to solve the situation without violating the pid_namespace > > rules and unshare() semantics (although I wish unshare(CLONE_NEWPID) had a less > > error prone behaviour with allowing creating more than one task belonging to the > > same namespace). > > > > So probably having an SRCU read side critical section within exit_notify() is > > not a good idea, is there a solution to work around that for rcu tasks? > > > Thanks for the analysis! > Add one more information: I tried to revert this commit only on top of > v6.1-rc5 mainline by script, but it caused kernel make to fail, it could not > confirm the bisect information is 100% accurate if I could not pass the > revert step verification. I just provide all the information I could.
No problem, I managed to reproduce with latest upstream. I don't think the bisected commit is the culprit though, it may perhaps just make the issue more likely to happen.
Thanks.
> > And this issue is too difficult to me. > If I find more clue, I will update the eamil. > > Thanks! > BR. > > > Thanks.
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