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Subject2.6.9-1.667smp perl page allocation failure
Hi,

Im specting some problems with a server. Somtimes (each 7 days more or
less) i can found some
errors in dmesg like the following:

perl5.8.5: page allocation failure. order:4, mode:0x50
[<0213d396>] __alloc_pages+0x28b/0x298
[<0213d3bb>] __get_free_pages+0x18/0x24
[<0213fc88>] kmem_getpages+0x1c/0xbb
[<021407d9>] cache_grow+0xae/0x136
[<021409c6>] cache_alloc_refill+0x165/0x19d
[<02140d9d>] __kmalloc+0x76/0x88
[<8293ee20>] kmem_alloc+0x50/0x9e [xfs]
[<8293eef0>] kmem_realloc+0x17/0x52 [xfs]
[<82924188>] xfs_iext_realloc+0xc9/0xdc [xfs]
[<82901912>] xfs_bmap_insert_exlist+0x22/0x77 [xfs]
[<828fed42>] xfs_bmap_add_extent_hole_delay+0x438/0x48e [xfs]
[<828fc7b4>] xfs_bmap_add_extent+0x146/0x399 [xfs]
[<829039bc>] xfs_bmapi+0xb00/0x12bf [xfs]
[<829031e2>] xfs_bmapi+0x326/0x12bf [xfs]
[<021398ef>] wake_up_page+0x9/0x29
[<82926bdf>] xfs_iomap_write_delay+0x628/0x702 [xfs]
[<8292ad03>] xlog_state_get_iclog_space+0x163/0x172 [xfs]
[<82925b32>] xfs_imap_to_bmap+0x2a/0x28a [xfs]
[<82925fcc>] xfs_iomap+0x23a/0x3ec [xfs]
[<82926076>] xfs_iomap+0x2e4/0x3ec [xfs]
[<82945e39>] xfs_bmap+0x1a/0x1e [xfs]
[<8294005f>] linvfs_get_block_core+0x6b/0x257 [xfs]
[<02139c3f>] find_or_create_page+0x18/0x72
[<022b7b17>] __cond_resched+0x14/0x39
[<02156002>] set_bh_page+0x2c/0x34
[<8294025e>] linvfs_get_block+0x13/0x17 [xfs]
[<0215664f>] __block_prepare_write+0x15d/0x3e4
[<02156f61>] block_prepare_write+0x16/0x23
[<8294024b>] linvfs_get_block+0x0/0x17 [xfs]
[<82940578>] linvfs_prepare_write+0x12/0x16 [xfs]
[<8294024b>] linvfs_get_block+0x0/0x17 [xfs]
[<0213b3c8>] generic_file_buffered_write+0x1b5/0x4ae
[<8290e4ed>] xfs_da_brelse+0x73/0x92 [xfs]
[<828f7400>] xfs_attr_leaf_get+0x4b/0x82 [xfs]
[<82945a87>] xfs_write+0x622/0x982 [xfs]
[<8294230d>] linvfs_write+0x6f/0x77 [xfs]
[<02153d7b>] do_sync_write+0x97/0xc9
[<8293a4d9>] xfs_inactive_free_eofblocks+0xd2/0x210 [xfs]
[<0211deca>] autoremove_wake_function+0x0/0x2d
[<02153e63>] vfs_write+0xb6/0xe2
[<02153f2d>] sys_write+0x3c/0x62
possible deadlock in kmem_alloc (mode:0x50)

There is alot of errors in a few second like that and its always follow
by several "possible deadlock in kmem_alloc (mode:0x50)"

Whats does it means?

The error is on a production server, is it dangerous?

What shoud I do to fix it?

Some extra info:
Filesystem: XFS
Kernel: 2.6.9-1.667smp


Thanks in advance. I have been searching several days and I have found nothing .

Ruben Rubio Rey

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