On (21/02/09 10:19), Petr Mladek wrote:
> On Sat 2021-02-06 13:41:24, Muchun Song wrote:
[..]
> What about the following commit message? It uses imperative language
> and explains that the patch just prevents the deadlock. It removes
> some details. The diagram is better than many words.
>
>
>
On (21/02/09 09:39), Petr Mladek wrote:
> > > So then this never re-inits the safe_read_lock?
>
> Yes, but it will also not cause the deadlock.
Right.
> I prefer this approach. It is straightforward because it handles
> read_lock the same way as logbuf_lock.
I'm fine with that approach, but
On Tue, Feb 9, 2021 at 5:19 PM Petr Mladek wrote:
>
> On Sat 2021-02-06 13:41:24, Muchun Song wrote:
> > We found a deadlock bug on our server when the kernel panic. It can be
> > described in the following diagram.
> >
> > CPU0: CPU1:
> > panic
On Sat 2021-02-06 13:41:24, Muchun Song wrote:
> We found a deadlock bug on our server when the kernel panic. It can be
> described in the following diagram.
>
> CPU0: CPU1:
> panic rcu_dump_cpu_stacks
>
On Mon 2021-02-08 23:40:07, Muchun Song wrote:
> On Mon, Feb 8, 2021 at 9:12 PM Sergey Senozhatsky
> wrote:
> >
> > On (21/02/08 16:49), Muchun Song wrote:
> > > On Mon, Feb 8, 2021 at 2:38 PM Sergey Senozhatsky
> > > wrote:
> > > >
> > > > On (21/02/06 13:41), Muchun Song wrote:
> > > > > We
On Mon, Feb 8, 2021 at 9:12 PM Sergey Senozhatsky
wrote:
>
> On (21/02/08 16:49), Muchun Song wrote:
> > On Mon, Feb 8, 2021 at 2:38 PM Sergey Senozhatsky
> > wrote:
> > >
> > > On (21/02/06 13:41), Muchun Song wrote:
> > > > We found a deadlock bug on our server when the kernel panic. It can be
On (21/02/08 16:49), Muchun Song wrote:
> On Mon, Feb 8, 2021 at 2:38 PM Sergey Senozhatsky
> wrote:
> >
> > On (21/02/06 13:41), Muchun Song wrote:
> > > We found a deadlock bug on our server when the kernel panic. It can be
> > > described in the following diagram.
> > >
> > > CPU0:
On Mon, Feb 8, 2021 at 2:38 PM Sergey Senozhatsky
wrote:
>
> On (21/02/06 13:41), Muchun Song wrote:
> > We found a deadlock bug on our server when the kernel panic. It can be
> > described in the following diagram.
> >
> > CPU0: CPU1:
> > panic
On (21/02/06 13:41), Muchun Song wrote:
> We found a deadlock bug on our server when the kernel panic. It can be
> described in the following diagram.
>
> CPU0: CPU1:
> panic rcu_dump_cpu_stacks
>
We found a deadlock bug on our server when the kernel panic. It can be
described in the following diagram.
CPU0: CPU1:
panic rcu_dump_cpu_stacks
kdump_nmi_shootdown_cpus
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