Re: Next 10: Badness at mm/allocpercpu.c:123

Sachin P. Sant wrote:

While booting Next 20090310 on a powerpc box (Power6 9117-MMA)
i observed the following badness :

[    0.339662] ------------[ cut here ]------------
[    0.339666] Badness at mm/allocpercpu.c:123
[    0.339670] NIP: c0000000001129dc LR: c0000000001129b8 CTR: 
0000000000000000
[    0.339676] REGS: c0000000fe1efa10 TRAP: 0700   Not tainted  
(2.6.29-rc7-next-20090310)
[    0.339681] MSR: 8000000000029032 <EE,ME,CE,IR,DR>  CR: 24000024  
XER: 20000002
[    0.339695] TASK = c0000000fe1dd3d0[1] 'swapper' THREAD: 
c0000000fe1ec000 CPU: 0
[    0.339701] GPR00: 0000000000000001 c0000000fe1efc90 
c000000000948660 c0000000fe019000
[    0.339711] GPR04: 0000000000000000 0000000000000000 
c0000000fe019080 c00000000122e980
[    0.339721] GPR08: 0000000000000000 c000000001467dec 
c0000000fe0e2610 c0000000fe1dd3d0
[    0.339732] GPR12: 0000000044000022 c000000000a22300 
c000000000733ad0 c00000000065e0c5
[    0.339742] GPR16: 0000000003c33a08 0000000000000000 
c000000000733a08 0000000002f1fc90
[    0.339752] GPR20: c000000000733a20 c000000000679b30 
0000000000000000 0000000002f1fc90
[    0.339763] GPR24: 0000000000000000 0000000000000000 
c000000000670ccd 0000000000000001
[    0.339773] GPR28: c0000000fe019000 0000000000000080 
c0000000008cb908 0000000000000100
[    0.339788] NIP [c0000000001129dc] .__alloc_percpu+0x7c/0x244
[    0.339793] LR [c0000000001129b8] .__alloc_percpu+0x58/0x244
[    0.339798] Call Trace:
[    0.339801] [c0000000fe1efc90] [c0000000001129b8] 
.__alloc_percpu+0x58/0x244 (unreliable)
[    0.339810] [c0000000fe1efdc0] [c00000000007ce84] 
.__create_workqueue_key+0x74/0x2a0
[    0.339819] [c0000000fe1efe70] [c000000000716990] 
.cpuset_init_smp+0x78/0xa4
[    0.339827] [c0000000fe1eff00] [c000000000700334] 
.kernel_init+0x16c/0x224
[    0.339834] [c0000000fe1eff90] [c00000000002adc8] 
.kernel_thread+0x54/0x70
[    0.339839] Instruction dump:
[    0.339843] 3863007f 78630624 4bffb94d 60000000 2bbd0008 7c7c1b78 
40fd0030 e93e8010
[    0.339856] 80090000 7c000034 5400d97e 78000020 <0b000000> 2fa00000 
41fe0010 e93e8010

I have attached the dmesg log here.

Next 20090306 had the same problem, while 20090305 did not.

I see that this WARN_ON was introduced by the following patch from Tejun.

http://lkml.org/lkml/2009/2/18/56

Should i be worried about this warning ?

Thanks
-Sachin


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Sachin Sant
IBM Linux Technology Center
India Systems and Technology Labs
Bangalore, India
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