linux-kernel - Re: [syzbot] [audit?] [bpf?] INFO: rcu detected stall in kauditd

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Message-Id: <20240331072502.3456-1-hdanton@sina.com>
Date: Sun, 31 Mar 2024 15:25:02 +0800
From: Hillf Danton <hdanton@...a.com>
To: Petr Mladek <pmladek@...e.com>
Cc: Eric Dumazet <edumazet@...gle.com>,
	Paul Moore <paul@...l-moore.com>,
	syzbot <syzbot+81f5ca46b043d4a1b789@...kaller.appspotmail.com>,
	linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [audit?] [bpf?] INFO: rcu detected stall in kauditd_thread (4)

On Thu, 28 Mar 2024 15:44:27 +0100 Petr Mladek <pmladek@...e.com>
> > > Call Trace:
> > >  <IRQ>
> > >  </IRQ>
> > >  <TASK>
> > >  csd_lock_wait kernel/smp.c:311 [inline]
> > >  smp_call_function_many_cond+0x50b/0x1590 kernel/smp.c:855
> > >  on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1023
> > >  on_each_cpu include/linux/smp.h:71 [inline]
> 
> It seems that this is really stuck because it is not able to
> run something on the other CPU.
> 
> IMHO, the primary problem is in the code proceed by the hrtimer.
> Adding networking people into Cc.

Yes the taprio hrtimer is a CPU hog [1]

[1] https://lore.kernel.org/lkml/00000000000003c53d0614ef21a4@google.com/