kenny at panix
Nov 4, 2009, 4:30 PM
Post #1 of 1
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Re: [TuxOnIce-users] strange OOM receiving a wireless network packet on a SLUB system
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This is a known issue in the .31 kernels. Google for it. I'm on a plane right now {gotta love GoGo Wireless :-) and will give more details later and a workaround.
Nix <nix [at] esperi> wrote:
>On 4 Nov 2009, Dominik Stadler stated:
>> I just saw a very similar thing happening to me here, ThinkPad T500, Ubuntu
>> 9.10, latest 3.0.1+TOI-Kernel from Karmic-PPA, I have some other weirdness
>> as well which I am not sure if TOI-related or Karmic, will do some
>> Divide-And-Conquer analysis next to find out the root cause of these and
>> report back.
>>
>> $ uname -a
>> Linux XXXXXX 2.6.31-15-generic #49+tuxonice2-Ubuntu SMP Sat Oct 31 01:46:15
>> UTC 2009 x86_64 GNU/Linux
>>
>> This is what I got just now:
>>
>> Nov 4 22:40:22 dstathink kernel: [39835.951178] swapper: page allocation
>> failure. order:2, mode:0x4020
>
>That doesn't really look similar to me (not a decompressor -22 error).
>To me it looks more like you ran out of memory, or at least ran very close
>to out: an order-2 allocation is not enormous (16Kb on x86) and should
>definitely work after everything's been chucked out. (mode 0x4020 implies
>a compound-page GFP_ATOMIC allocation, so it couldn't swap, but it
>could certainly discard clean pages.)
>
>Did this happen at suspension time, resumption time,or what? It looks
>like the kernel hadn't been up for long, so I guess we can rule out
>really really bad arena fragmentation... but it was long enough that I
>guess this was at suspension time?
>
>> Nov 4 22:40:22 dstathink kernel: [39835.951178] Pid: 0, comm: swapper
>> Tainted: G C 2.6.31-15-generic #49+tuxonice2-Ubuntu
>> Nov 4 22:40:22 dstathink kernel: [39835.951178] Call
>> Trace:
>> Nov 4 22:40:22 dstathink kernel: [39835.951178] <IRQ>
>> [<ffffffff810f1abc>]
>> __alloc_pages_slowpath+0x4cc/0x4e0
>>
>> Nov 4 22:40:22 dstathink kernel: [39835.951178] [<ffffffff810f1c1e>]
>> __alloc_pages_nodemask+0x14e/0x150
>>
>> Nov 4 22:40:22 dstathink kernel: [39835.951178] [<ffffffff811230ca>]
>> kmalloc_large_node+0x5a/0xb0
>>
>> Nov 4 22:40:22 dstathink kernel: [39835.951178] [<ffffffff81127275>]
>> __kmalloc_node_track_caller+0x135/0x180
>
>This is SLUB stuff. Is SLUB production-ready yet? (I haven't been
>following it.)
>
>(Networking, wireless, SLUB, no idea where to Cc this. I'll just Cc LKML
>and see if anyone notices :) )
>
>> Nov 4 22:40:22 dstathink kernel: [39835.951178] [<ffffffffa0245899>] ?
>> iwl_rx_allocate+0x1a9/0x230
>> [iwlcore]
>>
>> Nov 4 22:40:22 dstathink kernel: [39835.951178] [<ffffffff8144088b>]
>> __alloc_skb+0x7b/0x180
>>
>> Nov 4 22:40:22 dstathink kernel: [39835.951178] [<ffffffffa0245899>]
>> iwl_rx_allocate+0x1a9/0x230
>> [iwlcore]
>
>Wireless network packet reception leading to OOM. Not TuxOnIce, I'd say.
>Certainly not the same problem as me: I don't even *have* any wireless
>hardware (with my RSI, laptops might as well have razor blades on their
>keys).
>
>(Why does it need a 16Kb contiguous region anyway?
>
>> Nov 4 22:40:22 dstathink kernel: [39835.951178] [<ffffffff81010e12>] ?
>> cpu_idle+0xb2/0x100
>
>Idle, not suspending...
>
>> Nov 4 22:40:22 dstathink kernel: [39835.951178] Active_anon:365111
>> active_file:88612 inactive_anon:162361
>
>Lots of inactive pages. Why were none chucked out?
>
>> Nov 4 22:40:22 dstathink kernel: [39835.951178] inactive_file:243222
>> unevictable:4 dirty:214598 writeback:320 unstable:0
>
>214000+ dirty pages seems awfully high.
>
>> Nov 4 22:40:22 dstathink kernel: [39835.951178] free:6876 slab:51582
>> mapped:40147 pagetables:8440 bounce:0
>
>6876 free pages, a reasonable-enough figure, yet it couldn't find four
>in a row to receive a network packet? Seems unlikely.
>
>> Nov 4 22:40:22 dstathink kernel: [39835.951178] Node 0 DMA free:15644kB
>> min:28kB low:32kB high:40kB active_anon:12kB inactive_anon:32kB
>> active_file:4kB inactive_file:208kB unevictable:0kB present:15336kB
>> pages_scanned:0 all_unreclaimable? no
>>
>> Nov 4 22:40:22 dstathink kernel: [39835.951178] lowmem_reserve[]: 0 2958
>> 3905 3905
>>
>> Nov 4 22:40:22 dstathink kernel: [39835.951178] Node 0 DMA32 free:10124kB
>> min:6044kB low:7552kB high:9064kB active_anon:1223088kB
>> inactive_anon:367500kB active_file:218036kB inactive_file:833596kB
>> unevictable:16kB present:3029636kB pages_scanned:0 all_unreclaimable?
>> no
>>
>> Nov 4 22:40:22 dstathink kernel: [39835.951178] lowmem_reserve[]: 0 0 946
>> 946
>>
>> Nov 4 22:40:22 dstathink kernel: [39835.951178] Node 0 Normal free:1736kB
>> min:1932kB low:2412kB high:2896kB active_anon:237344kB
>> inactive_anon:281912kB active_file:136408kB inactive_file:139084kB
>> unevictable:0kB present:969600kB pages_scanned:0 all_unreclaimable?
>> no
>
>Again, heaps of inactive.
>
>> Nov 4 22:40:22 dstathink kernel: [39835.951178] lowmem_reserve[]: 0 0 0
>> 0
>>
>> Nov 4 22:40:22 dstathink kernel: [39835.951178] Node 0 DMA: 7*4kB 4*8kB
>> 2*16kB 2*32kB 2*64kB 2*128kB 3*256kB 2*512kB 3*1024kB 3*2048kB 1*4096kB 15644kB
>> Nov 4 22:40:22 dstathink kernel: [39835.951178] Node 0 DMA32: 2249*4kB
>> 35*8kB 1*16kB 0*32kB 1*64kB 0*128kB 1*256kB 1*512kB 0*1024kB 0*2048kB
>> 0*4096kB = 10124kB
>> Nov 4 22:40:22 dstathink kernel: [39835.951178] Node 0 Normal: 132*4kB
>> 127*8kB 2*16kB 1*32kB 0*64kB 1*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB
>> 0*4096kB = 1736kB
>> Nov 4 22:40:22 dstathink kernel: [39835.951178] 390803 total pagecache
>> pages
>>
>> Nov 4 22:40:22 dstathink kernel: [39835.951178] 12039 pages in swap
>> cache
>>
>> Nov 4 22:40:22 dstathink kernel: [39835.951178] Swap cache stats: add
>> 41296, delete 29257, find
>> 4825/7516
>>
>> Nov 4 22:40:22 dstathink kernel: [39835.951178] Free swap 8330844kB
>>
>> Nov 4 22:40:22 dstathink kernel: [39835.951178] Total swap 8393952kB
>>
>> Nov 4 22:40:22 dstathink kernel: [39835.951178] 1032192 pages
>> RAM
>>
>> Nov 4 22:40:22 dstathink kernel: [39835.951178] 76928 pages
>> reserved
>>
>> Nov 4 22:40:22 dstathink kernel: [39835.951178] 488347 pages
>> shared
>>
>> Nov 4 22:40:22 dstathink kernel: [39835.951178] 596692 pages non-shared
>
>OK, I don't know why this failed, but I'm an mm neophyte running on pure
>grep. Any ideas from anyone with an actual clue in this area? (I know OOM
>is all the rage right now, so maybe this will garner some attention :) )
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