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    SubjectRe: 2.6.15-rc1-git crashes in kswapd
    On Thu, Nov 17 2005, Jens Axboe wrote:
    > Hi,
    >
    > Running some disk tests on a box here (which has always been stable),
    > crashes in kswapd after the oom killer has triggered. It appears to be
    > calling wakeup_kswapd() with zone == NULL. Recent __alloc_pages()
    > "cleanup" perhaps not functionally equivelant?
    >
    >
    > oom-killer: gfp_mask=0x200d2, order=0
    > Mem-info:
    > DMA per-cpu:
    > cpu 0 hot: low 0, high 12, batch 2 used:0
    > cpu 0 cold: low 0, high 4, batch 1 used:3
    > DMA32 per-cpu:
    > cpu 0 hot: low 0, high 384, batch 64 used:41
    > cpu 0 cold: low 0, high 128, batch 32 used:63
    > Normal per-cpu: empty
    > HighMem per-cpu: empty
    > Free pages: 5396kB (0kB HighMem)
    > Active:55783 inactive:61639 dirty:0 writeback:0 unstable:0 free:1349 slab:6009 mapped:117281 pagetables:811
    > DMA free:2020kB min:56kB low:68kB high:84kB active:8200kB inactive:0kB present:10204kB pages_scanned:8293 all_unreclaimable? yes
    > lowmem_reserve[]: 0 488 488 488
    > DMA32 free:3376kB min:2796kB low:3492kB high:4192kB active:214932kB inactive:246556kB present:500140kB pages_scanned:289230 all_unreclaimable? no
    > lowmem_reserve[]: 0 0 0 0
    > Normal free:0kB min:0kB low:0kB high:0kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
    > lowmem_reserve[]: 0 0 0 0
    > HighMem free:0kB min:128kB low:128kB high:128kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
    > lowmem_reserve[]: 0 0 0 0
    > DMA: 1*4kB 0*8kB 0*16kB 1*32kB 1*64kB 1*128kB 1*256kB 1*512kB 1*1024kB 0*2048kB 0*4096kB = 2020kB
    > DMA32: 0*4kB 0*8kB 5*16kB 1*32kB 1*64kB 1*128kB 0*256kB 0*512kB 1*1024kB 1*2048kB 0*4096kB = 3376kB
    > Normal: empty
    > HighMem: empty
    > Swap cache: add 5310, delete 5278, find 817/1120, race 0+1
    > Free swap = 1103376kB
    > Total swap = 1116476kB
    > Free swap: 1103376kB
    > 130864 pages of RAM
    > 4182 reserved pages
    > 338330 pages shared
    > 32 pages swap cached
    > Out of Memory: Killed process 4045 (fio).
    > Unable to handle kernel NULL pointer dereference at 00000000000006b8 RIP:
    > <ffffffff8015a2e1>{wakeup_kswapd+8}
    > PGD 11fea067 PUD 11b24067 PMD 0
    > Oops: 0000 [1] SMP
    > CPU 0
    > Modules linked in: aic7xxx scsi_transport_spi ide_cd cdrom loop
    > Pid: 2256, comm: slpd Not tainted 2.6.15-rc1-ga620bc08 #15
    > RIP: 0010:[<ffffffff8015a2e1>] <ffffffff8015a2e1>{wakeup_kswapd+8}
    > RSP: 0000:ffff81000f87dca8 EFLAGS: 00010292
    > RAX: ffffffff804edd60 RBX: 0000000000000000 RCX: 0000000000000000
    > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
    > RBP: ffff81001cf3e040 R08: 0000000000000000 R09: 0000000000000000
    > R10: 00000000000001f9 R11: 0000000000000001 R12: 00000000000200d2
    > R13: 0000000000000000 R14: ffffffff804edd50 R15: 0000000000000000
    > FS: 00002aaaab4a16e0(0000) GS:ffffffff80624800(0000) knlGS:00000000556e28e0
    > CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
    > CR2: 00000000000006b8 CR3: 000000001430d000 CR4: 00000000000006e0
    > Process slpd (pid: 2256, threadinfo ffff81000f87c000, task ffff81001cf3e040)
    > Stack: 0000000000000000 0000000000000000 ffff81001cf3e040 ffffffff80154e1e
    > ffff810000000000 000000100000008d ffffffff804edd60 000200d200000008
    > 0000000000000000 ffffffff8014ff29
    > Call Trace:<ffffffff80154e1e>{__alloc_pages+119} <ffffffff8014ff29>{__lock_page+95}
    > <ffffffff80166ebe>{read_swap_cache_async+61} <ffffffff8015da45>{swapin_readahead+85}
    > <ffffffff8015fe11>{__handle_mm_fault+1758} <ffffffff803dbfd9>{do_page_fault+1049}
    > <ffffffff801393bd>{lock_timer_base+27} <ffffffff8013a059>{__mod_timer+177}
    > <ffffffff8013a143>{try_to_del_timer_sync+86} <ffffffff80134a8c>{do_setitimer+352}
    > <ffffffff8010e955>{error_exit+0}
    >
    > Code: 48 83 bf b8 06 00 00 00 74 55 48 8b af 98 06 00 00 48 8b 57
    > RIP <ffffffff8015a2e1>{wakeup_kswapd+8} RSP <ffff81000f87dca8>
    > CR2: 00000000000006b8

    This fixes it for me, does zonelist->zones change further down the path
    and we need the revalidation before after restarting?


    diff --git a/mm/page_alloc.c b/mm/page_alloc.c
    index 104e69c..77c663f 100644
    --- a/mm/page_alloc.c
    +++ b/mm/page_alloc.c
    @@ -857,6 +857,7 @@ restart:
    if (page)
    goto got_pg;

    + z = zonelist->zones; /* the list of zones suitable for gfp_mask */
    do
    wakeup_kswapd(*z, order);
    while (*(++z));

    --
    Jens Axboe

    -
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