linux-kernel - Strange behaviour after uptime of 208-209 days

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Date:	Mon, 07 May 2012 01:33:06 +0200
From:	Christoph Bartoschek <ponto@...tohonk.de>
To:	linux-kernel@...r.kernel.org
Subject: Strange behaviour after uptime of 208-209 days

Hi,

we run kernel 2.6.37.6 from opensuse 11.4. All machines with uptimes more 
than 208 days show strange behaviour. The scheduler seems to avoid some 
cores. For example on a 12 core machine only 3 cores are used. I see the 
following messages in the logfiles

May  6 04:16:50 r1106i14 kernel: [18446743865.627390] BUG: soft lockup - 
CPU#1 stuck for 4278190091s! [bonnRoute:12613]
May  6 04:16:51 r1106i14 kernel: [18446743866.001912] BUG: soft lockup - 
CPU#6 stuck for 4278190091s! [bonnRoute:25309]
May  6 04:16:51 r1106i14 kernel: [18446743866.676048] BUG: soft lockup - 
CPU#15 stuck for 4278190091s! [bonnRoute:28259]              
May  6 04:16:43 r1106i11 kernel: [18446743821.077585] BUG: soft lockup - 
CPU#2 stuck for 4278190091s! [chipbench:14254]
May  6 04:16:43 r1106i11 kernel: [18446743821.152489] BUG: soft lockup - 
CPU#3 stuck for 4278190091s! [chipbench:14246]
May  6 04:16:43 r1106i11 kernel: [18446743821.227393] BUG: soft lockup - 
CPU#4 stuck for 4278190091s! [chipbench:14220]
May  6 04:16:44 r1106i11 kernel: [18446743821.302297] BUG: soft lockup - 
CPU#5 stuck for 4278190091s! [chipbench:14271]
May  6 04:16:44 r1106i11 kernel: [18446743821.452108] BUG: soft lockup - 
CPU#7 stuck for 4278190092s! [chipbench:14190]
May  6 04:16:44 r1106i11 kernel: [18446743821.527011] BUG: soft lockup - 
CPU#8 stuck for 4278190092s! [chipbench:14173]
May  6 04:16:44 r1106i11 kernel: [18446743821.601915] BUG: soft lockup - 
CPU#9 stuck for 4278190091s! [chipbench:14162]
May  6 04:16:44 r1106i11 kernel: [18446743821.676820] BUG: soft lockup - 
CPU#10 stuck for 4278190091s! [chipbench:14296]
May  6 04:16:44 r1106i11 kernel: [18446743821.751724] BUG: soft lockup - 
CPU#11 stuck for 4278190091s! [chipbench:14203]


The representation of the kernel time stamp is near to 2^64. Is there an 
integer overflow involved?

Could you please tell me which kernel version fixed this bug?

Thanks
Christoph

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