On 02/13/2014 02:25 PM, Thomas Gleixner wrote:

On Wed, 12 Feb 2014, Fernando Lopez-Lezcano wrote:

quoted

[771508.546449] RIP: 0010:[<ffffffff810dc60a>]  [<ffffffff810dc60a>]
smp_call_function_many+0x2ca/0x330

Can you decode the exact location inside of smp_call_function_many via
addr2line please ?

Hope this is useful (adding 0x2ce/0x330 as offsets does not make any 
difference, don't know if it should)...

# grep smp_call_function /var/log/messages|tail -1
Feb 12 14:18:21 cmn27 kernel: [771840.224419] RIP: 
0010:[<ffffffff810dc60e>]  [<ffffffff810dc60e>] 
smp_call_function_many+0x2ce/0x330
# addr2line -e 
/usr/lib/debug/lib/modules/3.12.10-300.rt15.1.fc20.ccrma.x86_64+rt/vmlinux 
  ffffffff810dc60e
/usr/src/debug/kernel-3.12.fc20.ccrma/linux-3.12.10-300.rt15.1.fc20.ccrma.x86_64/kernel/rtmutex.c:1295

This is the only time I was able to catch some logs of the problem (if 
it is the same). I had to revert to 3.10.27-rt25 for the time being and 
that seems to be holding up well so far.

-- Fernando