Re: pagefaults and hang with 5.15.11

[Sven Schnelle <svens@stackframe.org>]

Hi Eike,

Rolf Eike Beer <eike-kernel@sf-tec.de> writes:

> 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

Looks like you have a serial console connected? If yes, could you trigger a 'TOC
s' from the BMC, and post the output from 'ser x 0 toc', where x is the
processer number? This could help debugging this.

Thanks
Sven