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SubjectRe: [PATCH 0/5] Candidate fix for increased number of GFP_ATOMIC failures V2
Mel Gorman wrote:
> [No BZ ID] Kernel crash on 2.6.31.x (kcryptd: page allocation failure..)
> This apparently is easily reproducible, particular in comparison to
> the other reports. The point of greatest interest is that this is
> order-0 GFP_ATOMIC failures. Sven, I'm hoping that you in particular
> will be able to follow the tests below as you are the most likely
> person to have an easily reproducible situation.

I've also seen order-0 failures on 2.6.31.5:
Note that this is with a one process hogging and mlocking memory and
min_free_kbytes reduced to 100 to reproduce the problem more easily.

I tried bisecting the issue, but in the end without memory pressure
I can't reproduce it reliably and with the above mentioned pressure
I get allocation failures even on 2.6.30.o

Initially the issue was that the machine hangs after the allocation
failure, but that seems to be a netconsole related issue, since I
didn't get a hang on 2.6.31 compiled without netconsole.
http://lkml.org/lkml/2009/11/1/66
http://lkml.org/lkml/2009/11/5/100

[ 375.398423] swapper: page allocation failure. order:0, mode:0x20
[ 375.398483] Pid: 0, comm: swapper Not tainted 2.6.31.5-nokmem-tomodachi #3
[ 375.398519] Call Trace:
[ 375.398566] [<c10395a8>] ? __alloc_pages_nodemask+0x40f/0x453
[ 375.398613] [<c104e988>] ? cache_alloc_refill+0x1f3/0x382
[ 375.398648] [<c104eb76>] ? __kmalloc+0x5f/0x97
[ 375.398690] [<c1228003>] ? __alloc_skb+0x44/0x101
[ 375.398723] [<c12289b5>] ? dev_alloc_skb+0x11/0x25
[ 375.398760] [<c11a53a1>] ? tulip_refill_rx+0x3c/0x115
[ 375.398793] [<c11a57f7>] ? tulip_poll+0x37d/0x416
[ 375.398832] [<c122cf56>] ? net_rx_action+0x3a/0xdb
[ 375.398874] [<c101d8b0>] ? __do_softirq+0x5b/0xcb
[ 375.398908] [<c101d855>] ? __do_softirq+0x0/0xcb
[ 375.398937] <IRQ> [<c1003e0b>] ? do_IRQ+0x66/0x76
[ 375.398989] [<c1002d70>] ? common_interrupt+0x30/0x38
[ 375.399026] [<c100725c>] ? default_idle+0x25/0x38
[ 375.399058] [<c1001a1e>] ? cpu_idle+0x64/0x7a
[ 375.399102] [<c14105ff>] ? start_kernel+0x251/0x258
[ 375.399133] Mem-Info:
[ 375.399159] DMA per-cpu:
[ 375.399184] CPU 0: hi: 0, btch: 1 usd: 0
[ 375.399214] Normal per-cpu:
[ 375.399241] CPU 0: hi: 90, btch: 15 usd: 28
[ 375.399276] Active_anon:6709 active_file:1851 inactive_anon:6729
[ 375.399278] inactive_file:2051 unevictable:40962 dirty:998 writeback:914 unstable:0
[ 375.399281] free:232 slab:1843 mapped:1404 pagetables:613 bounce:0
[ 375.399391] DMA free:924kB min:4kB low:4kB high:4kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:15028kB present:15872kB pages_scanned:0 all_unreclaimable? yes
[ 375.399465] lowmem_reserve[]: 0 230 230
[ 375.399537] Normal free:4kB min:92kB low:112kB high:136kB active_anon:26836kB inactive_anon:26916kB active_file:7404kB inactive_file:8204kB unevictable:148820kB present:235648kB pages_scanned:32 all_unreclaimable? no
[ 375.399615] lowmem_reserve[]: 0 0 0
[ 375.399681] DMA: 1*4kB 1*8kB 1*16kB 0*32kB 0*64kB 1*128kB 1*256kB 1*512kB 0*1024kB 0*2048kB 0*4096kB = 924kB
[ 375.399850] Normal: 1*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 4kB
[ 375.400016] 4412 total pagecache pages
[ 375.400041] 494 pages in swap cache
[ 375.400041] Swap cache stats: add 8110, delete 7616, find 139/205
[ 375.400041] Free swap = 494212kB
[ 375.400041] Total swap = 524280kB
[ 375.400041] 63472 pages RAM
[ 375.400041] 1742 pages reserved
[ 375.400041] 14429 pages shared
[ 375.400041] 56917 pages non-shared
[ 378.306631] swapper: page allocation failure. order:0, mode:0x20
[ 378.306686] Pid: 0, comm: swapper Not tainted 2.6.31.5-nokmem-tomodachi #3
[ 378.306722] Call Trace:
[ 378.306769] [<c10395a8>] ? __alloc_pages_nodemask+0x40f/0x453
[ 378.306817] [<c104e988>] ? cache_alloc_refill+0x1f3/0x382
[ 378.306853] [<c104eb76>] ? __kmalloc+0x5f/0x97
[ 378.306894] [<c1228003>] ? __alloc_skb+0x44/0x101
[ 378.306927] [<c12289b5>] ? dev_alloc_skb+0x11/0x25
[ 378.306964] [<c11a53a1>] ? tulip_refill_rx+0x3c/0x115
[ 378.306996] [<c11a57f7>] ? tulip_poll+0x37d/0x416
[ 378.307035] [<c122cf56>] ? net_rx_action+0x3a/0xdb
[ 378.307079] [<c101d8b0>] ? __do_softirq+0x5b/0xcb
[ 378.307112] [<c101d855>] ? __do_softirq+0x0/0xcb
[ 378.307142] <IRQ> [<c1003e0b>] ? do_IRQ+0x66/0x76
[ 378.307193] [<c1002d70>] ? common_interrupt+0x30/0x38
[ 378.307232] [<c100725c>] ? default_idle+0x25/0x38
[ 378.307263] [<c1001a1e>] ? cpu_idle+0x64/0x7a
[ 378.307306] [<c14105ff>] ? start_kernel+0x251/0x258
[ 378.307338] Mem-Info:
[ 378.307364] DMA per-cpu:
[ 378.307389] CPU 0: hi: 0, btch: 1 usd: 0
[ 378.307420] Normal per-cpu:
[ 378.307446] CPU 0: hi: 90, btch: 15 usd: 70
[ 378.307480] Active_anon:6231 active_file:2340 inactive_anon:6283
[ 378.307483] inactive_file:2445 unevictable:40962 dirty:989 writeback:1024 unstable:0
[ 378.307485] free:232 slab:1872 mapped:1408 pagetables:613 bounce:0
[ 378.307595] DMA free:924kB min:4kB low:4kB high:4kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:15028kB present:15872kB pages_scanned:0 all_unreclaimable? yes
[ 378.307668] lowmem_reserve[]: 0 230 230
[ 378.307739] Normal free:4kB min:92kB low:112kB high:136kB active_anon:24924kB inactive_anon:25132kB active_file:9360kB inactive_file:9780kB unevictable:148820kB present:235648kB pages_scanned:32 all_unreclaimable? no
[ 378.307816] lowmem_reserve[]: 0 0 0
[ 378.307882] DMA: 1*4kB 1*8kB 1*16kB 0*32kB 0*64kB 1*128kB 1*256kB 1*512kB 0*1024kB 0*2048kB 0*4096kB = 924kB
[ 378.308052] Normal: 1*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 4kB
[ 378.308219] 5866 total pagecache pages
[ 378.308247] 1065 pages in swap cache
[ 378.308277] Swap cache stats: add 9651, delete 8586, find 152/220
[ 378.308308] Free swap = 488152kB
[ 378.308334] Total swap = 524280kB
[ 378.310030] 63472 pages RAM
[ 378.310030] 1742 pages reserved
[ 378.310030] 15289 pages shared
[ 378.310030] 56019 pages non-shared

--
Tobias PGP: http://8ef7ddba.uguu.de


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