Messages in this thread | | | Date | Fri, 22 Jul 2011 08:10:54 +0200 | From | Tejun Heo <> | Subject | Re: Kernel Oops on enabling CONFIG_LOCK_STAT |
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(cc'ing Andrew. Thanks for forwarding. :)
Hi,
On Tue, Jul 19, 2011 at 06:59:36PM +0530, Shreshtha wrote: > After enabling CONFIG_LOCK_STAT, kernel Oops with following -
How reproducible is the problem? Can you please attach .config?
> <4>WARNING: at /home/kernel/mm/percpu-vm.c:181 pcpu_unmap_pages+0x44/0x10c() > <d>Modules linked in: > Backtrace: > [<c01a4e0c>] (dump_backtrace+0x0/0xf8) from [<c01a4f38>] (dump_stack+0x18/0x1c) > r7:00000000 r6:c028f6e0 r5:c0848bd2 r4:000000b5 > [<c01a4f20>] (dump_stack+0x0/0x1c) from [<c01e6848>] > (warn_slowpath_common+0x54/0x6c) > [<c01e67f4>] (warn_slowpath_common+0x0/0x6c) from [<c01e6884>] > (warn_slowpath_null+0x24/0x2c) > r9:df801fa0 r8:c1a27180 r7:00000000 r6:00000001 r5:00000167 > r4:00000167 > [<c01e6860>] (warn_slowpath_null+0x0/0x2c) from [<c028f6e0>] > (pcpu_unmap_pages+0x44/0x10c) > [<c028f69c>] (pcpu_unmap_pages+0x0/0x10c) from [<c0290778>] > (pcpu_populate_chunk+0x250/0x314) > [<c0290528>] (pcpu_populate_chunk+0x0/0x314) from [<c0290a38>] > (pcpu_alloc+0x1fc/0x2f0) > [<c029083c>] (pcpu_alloc+0x0/0x2f0) from [<c0290b58>] (__alloc_percpu+0x14/0x18) > [<c0290b44>] (__alloc_percpu+0x0/0x18) from [<c03c6468>] > (__percpu_counter_init+0x48/0xa4) > [<c03c6420>] (__percpu_counter_init+0x0/0xa4) from [<c00192c0>] > (mmap_init+0x28/0x34) > r7:c0913d7c r6:c0035074 r5:c0977ca0 r4:00000000 > [<c0019298>] (mmap_init+0x0/0x34) from [<c0013860>] (proc_caches_init+0xc8/0xf0) > [<c0013798>] (proc_caches_init+0x0/0xf0) from [<c0008f58>] > (start_kernel+0x204/0x288) > r5:c0974240 r4:c0f2b54c > [<c0008d54>] (start_kernel+0x0/0x288) from [<00008080>] (0x8080) > r5:c0975284 r4:10c53c7d
Hrmm... so it's pcpu_populate_chunk() failure path. Can you please attach full kernel log? Attaching full kernel log and including a bit of hardware details is generally a good idea when reporting a bug.
It's most likely there's a bug in the code which rolls back from partial allocation after encountering alloc failure in the middle. I'll take a deeper look there and report what I find.
Thank you.
-- tejun
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