Subject: Re: RESEND, HTB(?) softlockup, vanilla 2.6.24

From: Jarek Poplawski <[email-masked]>
Date: Sat, 16 Feb 2008 09:00:36 +0100

Denys Fedoryshchenko wrote, On 02/13/2008 09:13 AM:

> It is very difficult to reproduce, happened after running about 1month. No 
> changes done in classes at time of crash.
> 
> Kernel 2.6.24 vanilla

Hi,

I could be wrong, but IMHO this looks like stack was overridden here,
so my proposal is to try this:

CONFIG_DEBUG_STACKOVERFLOW=y

But, if you're not very interested in reproducing this, you could also
try to turn off some other debugging, especially lockdep.

Regards,
Jarek P.

...

> Feb 10 15:53:22 SHAPER [ 8271.778915] BUG: NMI Watchdog detected LOCKUP
> Feb 10 15:53:22 SHAPER on CPU1, eip c01f0e5d, registers:

...

> Feb 10 15:53:22 SHAPER [ 8271.779307] Pid: 0, comm: swapper Not tainted 
> (2.6.24-build-0021 #26)
> Feb 10 15:53:22 SHAPER [ 8271.779327] EIP: 0060:[<c01f0e5d>] EFLAGS: 00000082 
> CPU: 1
> Feb 10 15:53:22 SHAPER [ 8271.779349] EIP is at __rb_rotate_right+0x5/0x50
> Feb 10 15:53:22 SHAPER [ 8271.779366] EAX: f76494a4 EBX: f76494a4 ECX: 
> f76494a4 EDX: c1ff5f80
> Feb 10 15:53:22 SHAPER [ 8271.779386] ESI: f76494a4 EDI: c1ff5f80 EBP: 
> 00000000 ESP: f7c29c70
> Feb 10 15:53:22 SHAPER [ 8271.779406]  DS: 007b ES: 007b FS: 00d8 GS: 0000 
> SS: 0068
> Feb 10 15:53:22 SHAPER [ 8271.779425] Process swapper (pid: 0, ti=f7c28000 
> task=f7c20a60 task.ti=f7c28000)
> Feb 10 15:53:22 SHAPER
> Feb 10 15:53:22 SHAPER [ 8271.779446] Stack:
> Feb 10 15:53:22 SHAPER f76494a4
> Feb 10 15:53:22 SHAPER f76494a4
> Feb 10 15:53:22 SHAPER f76494a4
> Feb 10 15:53:22 SHAPER c01f0ef4
> Feb 10 15:53:22 SHAPER c1ff5f80
> Feb 10 15:53:22 SHAPER f76494a4
> Feb 10 15:53:22 SHAPER f76494a8
> Feb 10 15:53:22 SHAPER c1ff5f78
> Feb 10 15:53:22 SHAPER
> Feb 10 15:53:22 SHAPER [ 8271.779493]
> Feb 10 15:53:22 SHAPER [ 8271.779307] Pid: 0, comm: swapper Not tainted 
> (2.6.24-build-0021 #26)
> Feb 10 15:53:22 SHAPER [ 8271.779327] EIP: 0060:[<c01f0e5d>] EFLAGS: 00000082 
> CPU: 1
> Feb 10 15:53:22 SHAPER [ 8271.779349] EIP is at __rb_rotate_right+0x5/0x50
> Feb 10 15:53:22 SHAPER [ 8271.779366] EAX: f76494a4 EBX: f76494a4 ECX: 
> f76494a4 EDX: c1ff5f80
> Feb 10 15:53:22 SHAPER [ 8271.779386] ESI: f76494a4 EDI: c1ff5f80 EBP: 
> 00000000 ESP: f7c29c70
> Feb 10 15:53:22 SHAPER [ 8271.779406]  DS: 007b ES: 007b FS: 00d8 GS: 0000 
> SS: 0068
> Feb 10 15:53:22 SHAPER [ 8271.779425] Process swapper (pid: 0, ti=f7c28000 
> task=f7c20a60 task.ti=f7c28000)
> Feb 10 15:53:22 SHAPER
> Feb 10 15:53:22 SHAPER [ 8271.779446] Stack:
> Feb 10 15:53:22 SHAPER f76494a4
> Feb 10 15:53:22 SHAPER f76494a4
> Feb 10 15:53:22 SHAPER f76494a4

...