Re: 2.6.34-rc3: simple du (on a big xfs tree) triggers oom killer

Dave Chinner
2010-04-05T00:47:23Z

On Mon, Apr 05, 2010 at 12:49:17AM +0200, Hans-Peter Jansen wrote:
> [Sorry for the cross post, but I don't know where to start to tackle this
> issue]
>
> Hi,
>
> on an attempt to get to a current kernel, I suffer from an issue, where a
> simple du on a reasonably big xfs tree leads to invoking the oom killer:

How big is the directory tree (how many inodes, etc)?

> Apr 4 23:24:53 tyrex kernel: [ 418.913223] XFS mounting filesystem sdd1
> Apr 4 23:24:54 tyrex kernel: [ 419.774606] Ending clean XFS mount for filesystem: sdd1
> Apr 4 23:26:02 tyrex kernel: [ 488.160795] du invoked oom-killer: gfp_mask=0x802d0, order=0, oom_adj=0
> Apr 4 23:26:02 tyrex kernel: [ 488.160798] du cpuset=/ mems_allowed=0
> Apr 4 23:26:02 tyrex kernel: [ 488.160800] Pid: 6397, comm: du Tainted: G W 2.6.34-rc3-13-vanilla #1
> Apr 4 23:26:02 tyrex kernel: [ 488.160802] Call Trace:
> Apr 4 23:26:02 tyrex kernel: [ 488.160808] [<c02becc7>] dump_header+0x67/0x1a0
> Apr 4 23:26:02 tyrex kernel: [ 488.160811] [<c03cf1a7>] ? ___ratelimit+0x77/0xe0
> Apr 4 23:26:02 tyrex kernel: [ 488.160813] [<c02bee59>] oom_kill_process+0x59/0x160
> Apr 4 23:26:02 tyrex kernel: [ 488.160815] [<c02bf43e>] __out_of_memory+0x4e/0xc0
> Apr 4 23:26:02 tyrex kernel: [ 488.160817] [<c02bf502>] out_of_memory+0x52/0xc0
> Apr 4 23:26:02 tyrex kernel: [ 488.160819] [<c02c20f4>] __alloc_pages_slowpath+0x444/0x4c0
> Apr 4 23:26:02 tyrex kernel: [ 488.160822] [<c02c22c2>] __alloc_pages_nodemask+0x152/0x160
> Apr 4 23:26:02 tyrex kernel: [ 488.160825] [<c02ea4a9>] cache_grow+0x249/0x2e0
> Apr 4 23:26:02 tyrex kernel: [ 488.160838] [<c02ea748>] cache_alloc_refill+0x208/0x240
> Apr 4 23:26:02 tyrex kernel: [ 488.160840] [<c02eab19>] kmem_cache_alloc+0xb9/0xc0
> Apr 4 23:26:02 tyrex kernel: [ 488.160868] [<f86375dd>] ? xfs_trans_brelse+0xfd/0x150 [xfs]
> Apr 4 23:26:02 tyrex kernel: [ 488.160888] [<f863d547>] kmem_zone_alloc+0x77/0xb0 [xfs]
> Apr 4 23:26:02 tyrex kernel: [ 488.160905] [<f860a043>] ? xfs_da_state_free+0x53/0x60 [xfs]
> Apr 4 23:26:02 tyrex kernel: [ 488.160923] [<f861c796>] xfs_inode_alloc+0x26/0x110 [xfs]
> Apr 4 23:26:02 tyrex kernel: [ 488.160941] [<f861c8b2>] xfs_iget_cache_miss+0x32/0x200 [xfs]
> Apr 4 23:26:02 tyrex kernel: [ 488.160960] [<f8630fd9>] ? xfs_perag_get+0x29/0xa0 [xfs]
> Apr 4 23:26:02 tyrex kernel: [ 488.160977] [<f861cbac>] xfs_iget+0x12c/0x1b0 [xfs]
> Apr 4 23:26:02 tyrex kernel: [ 488.160997] [<f863c9c5>] xfs_lookup+0xc5/0x110 [xfs]
> Apr 4 23:26:02 tyrex kernel: [ 488.161017] [<f86467d1>] xfs_vn_lookup+0x51/0xa0 [xfs]
> Apr 4 23:26:02 tyrex kernel: [ 488.161021] [<c02ffef7>] do_lookup+0xa7/0x1c0
> Apr 4 23:26:02 tyrex kernel: [ 488.161023] [<c030089b>] link_path_walk+0x1db/0x850
> Apr 4 23:26:02 tyrex kernel: [ 488.161026] [<c024a870>] ? capable+0x10/0x40
> Apr 4 23:26:02 tyrex kernel: [ 488.161028] [<c038969e>] ? security_inode_permission+0x1e/0x20
> Apr 4 23:26:02 tyrex kernel: [ 488.161030] [<c0301294>] path_walk+0x54/0xc0
> Apr 4 23:26:02 tyrex kernel: [ 488.161032] [<c0301431>] do_path_lookup+0x51/0x90
> Apr 4 23:26:02 tyrex kernel: [ 488.161034] [<c0301f8a>] user_path_at+0x4a/0x80
> Apr 4 23:26:02 tyrex kernel: [ 488.161037] [<c02f9748>] ? cp_new_stat64+0xe8/0x100
> Apr 4 23:26:02 tyrex kernel: [ 488.161039] [<c02f9bb5>] vfs_fstatat+0x35/0x70
> Apr 4 23:26:02 tyrex kernel: [ 488.161041] [<c02f9c0d>] sys_fstatat64+0x1d/0x40
> Apr 4 23:26:02 tyrex kernel: [ 488.161044] [<c0202d8c>] sysenter_do_call+0x12/0x22
> Apr 4 23:26:02 tyrex kernel: [ 488.161045] Mem-Info:
> Apr 4 23:26:02 tyrex kernel: [ 488.161046] DMA per-cpu:
> Apr 4 23:26:02 tyrex kernel: [ 488.161047] CPU 0: hi: 0, btch: 1 usd: 0
> Apr 4 23:26:02 tyrex kernel: [ 488.161048] CPU 1: hi: 0, btch: 1 usd: 0
> Apr 4 23:26:02 tyrex kernel: [ 488.161050] CPU 2: hi: 0, btch: 1 usd: 0
> Apr 4 23:26:02 tyrex kernel: [ 488.161051] CPU 3: hi: 0, btch: 1 usd: 0
> Apr 4 23:26:02 tyrex kernel: [ 488.161052] CPU 4: hi: 0, btch: 1 usd: 0
> Apr 4 23:26:02 tyrex kernel: [ 488.161053] CPU 5: hi: 0, btch: 1 usd: 0
> Apr 4 23:26:02 tyrex kernel: [ 488.161054] CPU 6: hi: 0, btch: 1 usd: 0
> Apr 4 23:26:02 tyrex kernel: [ 488.161056] CPU 7: hi: 0, btch: 1 usd: 0
> Apr 4 23:26:02 tyrex kernel: [ 488.161057] Normal per-cpu:
> Apr 4 23:26:02 tyrex kernel: [ 488.161058] CPU 0: hi: 186, btch: 31 usd: 173
> Apr 4 23:26:02 tyrex kernel: [ 488.161059] CPU 1: hi: 186, btch: 31 usd: 18
> Apr 4 23:26:02 tyrex kernel: [ 488.161060] CPU 2: hi: 186, btch: 31 usd: 41
> Apr 4 23:26:02 tyrex kernel: [ 488.161061] CPU 3: hi: 186, btch: 31 usd: 197
> Apr 4 23:26:02 tyrex kernel: [ 488.161062] CPU 4: hi: 186, btch: 31 usd: 175
> Apr 4 23:26:02 tyrex kernel: [ 488.161063] CPU 5: hi: 186, btch: 31 usd: 157
> Apr 4 23:26:02 tyrex kernel: [ 488.161065] CPU 6: hi: 186, btch: 31 usd: 182
> Apr 4 23:26:02 tyrex kernel: [ 488.161066] CPU 7: hi: 186, btch: 31 usd: 173
> Apr 4 23:26:02 tyrex kernel: [ 488.161067] HighMem per-cpu:
> Apr 4 23:26:02 tyrex kernel: [ 488.161068] CPU 0: hi: 186, btch: 31 usd: 24
> Apr 4 23:26:02 tyrex kernel: [ 488.161069] CPU 1: hi: 186, btch: 31 usd: 33
> Apr 4 23:26:02 tyrex kernel: [ 488.161070] CPU 2: hi: 186, btch: 31 usd: 55
> Apr 4 23:26:02 tyrex kernel: [ 488.161071] CPU 3: hi: 186, btch: 31 usd: 172
> Apr 4 23:26:02 tyrex kernel: [ 488.161072] CPU 4: hi: 186, btch: 31 usd: 177
> Apr 4 23:26:02 tyrex kernel: [ 488.161073] CPU 5: hi: 186, btch: 31 usd: 100
> Apr 4 23:26:02 tyrex kernel: [ 488.161075] CPU 6: hi: 186, btch: 31 usd: 38
> Apr 4 23:26:02 tyrex kernel: [ 488.161076] CPU 7: hi: 186, btch: 31 usd: 115
> Apr 4 23:26:02 tyrex kernel: [ 488.161078] active_anon:98428 inactive_anon:24627 isolated_anon:0
> Apr 4 23:26:02 tyrex kernel: [ 488.161079] active_file:4141 inactive_file:25571 isolated_file:0
> Apr 4 23:26:02 tyrex kernel: [ 488.161080] unevictable:0 dirty:2 writeback:0 unstable:0
> Apr 4 23:26:02 tyrex kernel: [ 488.161080] free:403317 slab_reclaimable:203863 slab_unreclaimable:4837
> Apr 4 23:26:02 tyrex kernel: [ 488.161081] mapped:7418 shmem:137 pagetables:625 bounce:0
> Apr 4 23:26:02 tyrex kernel: [ 488.161085]
> DMA free:3520kB min:64kB low:80kB high:96kB active_anon:0kB inactive_anon:0kB
> active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB
> present:15804kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:6032kB
> slab_unreclaimable:36kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB writeback_tmp:0kB
> pages_scanned:0 all_unreclaimable? yes
> Apr 4 23:26:02 tyrex kernel: [ 488.161089] lowmem_reserve[]: 0 865 3023 3023
> Apr 4 23:26:02 tyrex kernel: [ 488.161093]
> Normal free:3580kB min:3728kB low:4660kB high:5592kB active_anon:0kB inactive_anon:0kB
> active_file:360kB inactive_file:264kB unevictable:0kB isolated(anon):0kB isolated(file):0kB
> present:885944kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:809420kB
> slab_unreclaimable:19312kB kernel_stack:3304kB pagetables:0kB unstable:0kB bounce:0kB writeback_tmp:0kB
> pages_scanned:24 all_unreclaimable? no
> Apr 4 23:26:02 tyrex kernel: [ 488.161097] lowmem_reserve[]: 0 0 17267 17267
> Apr 4 23:26:02 tyrex kernel: [ 488.161101]
> HighMem free:1606168kB min:512kB low:2836kB high:5164kB active_anon:393712kB inactive_anon:98508kB
> active_file:16228kB inactive_file:102020kB unevictable:0kB isolated(anon):0kB isolated(file):0kB
> present:2210252kB mlocked:0kB dirty:8kB writeback:0kB mapped:29672kB shmem:548kB slab_reclaimable:0kB
> slab_unreclaimable:0kB kernel_stack:0kB pagetables:2500kB unstable:0kB bounce:0kB writeback_tmp:0kB
> pages_scanned:0 all_unreclaimable? no
> Apr 4 23:26:02 tyrex kernel: [ 488.161105] lowmem_reserve[]: 0 0 0 0
> Apr 4 23:26:02 tyrex kernel: [ 488.161107] DMA: 18*4kB 53*8kB 31*16kB 20*32kB 14*64kB 8*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 3552kB
> Apr 4 23:26:02 tyrex kernel: [ 488.161112] Normal: 32*4kB 1*8kB 1*16kB 1*32kB 1*64kB 1*128kB 1*256kB 0*512kB 1*1024kB 1*2048kB 0*4096kB = 3704kB
> Apr 4 23:26:02 tyrex kernel: [ 488.161117] HighMem: 17*4kB 29*8kB 47*16kB 16*32kB 6*64kB 30*128kB 53*256kB 27*512kB 14*1024kB 7*2048kB 377*4096kB = 1606044kB
> Apr 4 23:26:02 tyrex kernel: [ 488.161122] 29947 total pagecache pages
> Apr 4 23:26:02 tyrex kernel: [ 488.161123] 0 pages in swap cache
> Apr 4 23:26:02 tyrex kernel: [ 488.161124] Swap cache stats: add 0, delete 0, find 0/0
> Apr 4 23:26:02 tyrex kernel: [ 488.161125] Free swap = 2104476kB
> Apr 4 23:26:02 tyrex kernel: [ 488.161126] Total swap = 2104476kB
> Apr 4 23:26:02 tyrex kernel: [ 488.165523] 784224 pages RAM
> Apr 4 23:26:02 tyrex kernel: [ 488.165524] 556914 pages HighMem
> Apr 4 23:26:02 tyrex kernel: [ 488.165525] 12060 pages reserved
> Apr 4 23:26:02 tyrex kernel: [ 488.165526] 82604 pages shared
> Apr 4 23:26:02 tyrex kernel: [ 488.165527] 328045 pages non-shared
> Apr 4 23:26:02 tyrex kernel: [ 488.165529] Out of memory: kill process 4788 (mysqld-max) score 326208 or a child
> Apr 4 23:26:02 tyrex kernel: [ 488.165531] Killed process 4788 (mysqld-max) vsz:1304832kB, anon-rss:121428kB, file-rss:4336kB
> [...]

Oh, this is a highmem box. You ran out of low memory, I think, which
is where all the inodes are cached. Seems like a VM problem or a
highmem/lowmem split config problem to me, not anything to do with
XFS...

Cheers,

Dave.
--
Dave Chinner
david@fromorbit.com