View Incident:
http://co-op.engr.sgi.com/BugWorks/code/bwxquery.cgi?search=Search&wlong=1&view_type=Bug&wi=821124
Submitter : ananth Submitter Domain : engr
Assigned Engineer : nb Assigned Domain : sgi.com
Assigned Group : xfs-linux Category : software
Customer Reported : F Priority : 2
Project : xfs-linux Status : open
Description :
This problem seen with XFS 1.0 bits on a 64 M, 2CPU system with
1 scsi disk. Tests being run in parallel:
while true; do holes -l 300000000 -b 4099 -i 7 -c 7 /xfs/holes; date; done
and AIM 7, run to crossover.
It took about 3-4 hours to hit this problem, by then
AIM had gone to about 170 processes. In the end,
console became unresponsive ... looking at time-stamps
printed by the test processes it appears to have been
stuck for over 16+ hours.
A complete list of stack traces available at:
waco.engr:/home/ananth/xfs.debug.7
The crux of the problem seems to be this:
----------------
[1]kdb> btp 16044
Function
schedule+0x41e
__down+0x73
__down_failed+0x8
[pagebuf]_pagebuf_grab_lock+0x11
[pagebuf]_pagebuf_find_lockable_buffer+0x116
[pagebuf]_pagebuf_get_lockable_buffer+0x2f
[pagebuf]pagebuf_get_Rsmp_e7734c5d+0xae
[xfs]xfs_trans_read_buf+0x207
[xfs]xfs_alloc_read_agf+0x77
[xfs]xfs_alloc_fix_freelist+0x16f
[xfs]xfs_alloc_vextent+0x310
[xfs]xfs_bmap_alloc+0x1f22
[xfs]xfs_bmapi+0x883
[xfs]xfs_strategy+0x694
[xfs]linvfs_pb_bmap+0x7f
[pagebuf]pagebuf_delalloc_convert+0x44
[pagebuf]pagebuf_write_full_page_Rsmp_960947d6+0x64
[xfs]linvfs_write_full_page_nounlock+0xf
try_to_free_buffers+0x50
page_launder+0x389
do_try_to_free_pages+0x34
try_to_free_pages+0x22
__alloc_pages+0x252
__get_free_pages+0x14
kmem_cache_grow+0xdc
kmem_cache_alloc+0xa9
[pagebuf]_pagebuf_get_object+0x1c
[pagebuf]_pagebuf_get_lockable_buffer+0x69
[pagebuf]pagebuf_get_Rsmp_e7734c5d+0xae
[xfs]xfs_trans_read_buf+0x207
[xfs]xfs_btree_read_bufl+0xd4
[xfs]xfs_bmbt_lookup+0x167
[xfs]xfs_bmbt_lookup_eq+0x3e
[xfs]xfs_bmap_add_extent_delay_real+0x942
[xfs]xfs_bmap_add_extent+0x26f
[xfs]xfs_bmapi+0xac4
[xfs]xfs_strategy+0x694
[xfs]linvfs_pb_bmap+0x7f
[pagebuf]__pb_block_prepare_write_async+0x12b
[pagebuf]pagebuf_write_full_page_Rsmp_960947d6+0xce
[xfs]linvfs_write_full_page_nounlock+0xf
_write_buffer+0x73
fsync_inode_buffers+0xc2
[xfs]xfs_write+0x364
[xfs]linvfs_write+0x114
sys_write+0x8e
system_call+0x33
----------------------
ananth.
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