Re: pagefaults and hang with 5.15.11

[Sven Schnelle <svens@stackframe.org>]

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

> Am Samstag, 1. Januar 2022, 23:12:16 CET schrieb Sven Schnelle:
>> 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.
>> > 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.
>
> Yes, this is all from serial. I guess this only works during the hang? That 
> means I have to boot into the bad kernel again and wait until it breaks. 

Yes, when it hangs, press ESC followed by '('. This should give you the
BMC prompt:

CLI>

Enter TOC s - this will take around 10s, and reboot the box. in the boot
menu, you can than take a look at the TOC data with the mentioned
service command.

/Sven