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

From: "Denys Fedoryshchenko" <[email-masked]>
Date: Sat, 16 Feb 2008 12:25:31 +0200

Thanks, i will try it.
You think lockdep can be buggy?

On Sat, 16 Feb 2008 09:00:36 +0100, Jarek Poplawski wrote
> 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
> 
> ....
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--
Denys Fedoryshchenko
Technical Manager
Virtual ISP S.A.L.