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List:       linux-parisc
Subject:    Re: pagefaults and hang with 5.15.11
From:       Rolf Eike Beer <eike-kernel () sf-tec ! de>
Date:       2021-12-28 21:55:47
Message-ID: 3407744.iIbC2pHGDl () daneel ! sf-tec ! de
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Am Montag, 27. Dezember 2021, 15:30:10 CET schrieb Rolf Eike Beer:
> Am Sonntag, 26. Dezember 2021, 18:22:12 CET schrieb John David Anglin:
> > On 2021-12-26 11:21 a.m., Rolf Eike Beer wrote:
> > > [139181.966881] WARNING: CPU: 1 PID: 0 at kernel/rcu/tree.c:613
> > > rcu_eqs_enter.constprop.0+0x8c/0x98
> > 
> > This is probably not reproducible. You might try this change from Sven
> 
> At least this time the git testsuite has finished, but with some errors as
> usual.
> 
> > diff --git a/arch/parisc/kernel/smp.c b/arch/parisc/kernel/smp.c
> > index cf92ece20b75..0cd97fa004c5 100644
> > --- a/arch/parisc/kernel/smp.c
> > +++ b/arch/parisc/kernel/smp.c
> > @@ -228,11 +228,13 @@ static inline void
> > 
> >   send_IPI_allbutself(enum ipi_message_type op)
> >   {
> >   
> >          int i;
> > 
> > -
> > +
> > +       preempt_disable();
> > 
> >          for_each_online_cpu(i) {
> >          
> >                  if (i != smp_processor_id())
> >                  
> >                          send_IPI_single(i, op);
> >          
> >          }
> > 
> > +       preempt_enable();
> > 
> >   }
> >   
> >   #ifdef CONFIG_KGDB
> 
> I'll add this and see what happens.

The machine locked up again, but without many output:

[13093.642353] INEQUIVALENT ALIASES 0x96000 and 0xf5bba000 in file xargs
[13094.122900] INEQUIVALENT ALIASES 0x110000 and 0xf5a63000 in file find
[13260.968430] INEQUIVALENT ALIASES 0x96000 and 0xf5bba000 in file xargs
[16995.351108] ttyS ttyS1:[17649.655079] t[17650.739194] t[17658.174951] 
t[17659.307044] t[24039.432030] INEQUIVALENT ALIASES 0x113000 and 0xf5a66000 
in file find

And after reset it got trouble during boot:

  Configuration setting "allocation/zero_metadata" unknown.
[   76.490814] watchdog: BUG: soft lockup - CPU#3 stuck for 23s! [lvm:2612]

Luckily it worked on the next attempt.

> > and my "[PATCH v3] parisc: Rewrite light-weight syscall and futex code"
> > change. Page faults in the LWS code can mess up scheduling.
> 
> But that would be nothing new. At least the machine has been quite stable in
> the last time.
> 
> > I haven't found 5.15.11 to be stable.

Neither do I.

I assume it's some sort of backport, since 5.15.0 has been quite stable:

reboot   system boot  5.15.11-gentoo-p Sat Dec 25 00:18   still running
reboot   system boot  5.15.0-gentoo-pa Sun Dec 19 11:46 - 00:13 (5+12:27)
reboot   system boot  5.15.0-gentoo-pa Thu Nov 25 14:40 - 00:13 (29+09:33)
reboot   system boot  5.15.0-gentoo-pa Thu Nov  4 10:23 - 14:35 (21+04:11)

Eike
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