[mythtv-users] Mythbackend: page allocation failure

Fedor Pikus fpikus at gmail.com
Tue Jun 14 16:16:06 UTC 2005

On 6/14/05, Khanh Tran <khanh at slc.edu> wrote:
> I keep getting the following errors in my kernel messages.  Also,
> playback from pre-recorded files is starting to get unstable.
> Mythcommflag processes also seem to never end.  Can anyone tell me
> what's going on and how to fix this?

Which kernel version? There are bugs filed against XFS with similar
problems, seems to be a known issue occuring with XFS under high
loads. It is *supposed* to be recoverable, but it will pause your
system for several seconds, probably not good for recording in real
time. Commflagger may get confused by pauses and takes forever trying
to slice your recordings to ribbons.

> Thanks!
> mythbackend: page allocation failure. order:4, mode:0x50
>  [<c013a790>] __alloc_pages+0x400/0x470
>  [<c013a818>] __get_free_pages+0x18/0x30
>  [<c013d569>] kmem_getpages+0x19/0xb0
>  [<c013e084>] cache_grow+0x84/0x120
>  [<c013e24a>] cache_alloc_refill+0x12a/0x1e0
>  [<c013e66c>] __kmalloc+0x5c/0x60
>  [<ece14650>] kmem_alloc+0x50/0xc0 [xfs]
>  [<ece14747>] kmem_realloc+0x17/0x60 [xfs]
>  [<ecdf69c7>] xfs_iext_realloc+0x87/0xe0 [xfs]
>  [<ecdcf025>] xfs_bmap_insert_exlist+0x25/0x70 [xfs]
>  [<ecdc9bd6>] xfs_bmap_add_extent_delay_real+0x7f6/0x1310 [xfs]
>  [<ece0af94>] xfs_trans_log_inode+0x14/0x40 [xfs]
>  [<ecdcd207>] xfs_bmap_alloc+0xf77/0x1b00 [xfs]
>  [<ecdd7aba>] xfs_bmbt_get_state+0xa/0x20 [xfs]
>  [<ecdc93cc>] xfs_bmap_add_extent+0x3fc/0x410 [xfs]
>  [<ece147cb>] kmem_zone_alloc+0x3b/0x90 [xfs]
>  [<ecdd0feb>] xfs_bmapi+0x73b/0x1710 [xfs]
>  [<ecdf9898>] xfs_iomap_write_delay+0x638/0x7b0 [xfs]
>  [<ecdd7aba>] xfs_bmbt_get_state+0xa/0x20 [xfs]
>  [<ecdcf481>] xfs_bmap_do_search_extents+0x121/0x440 [xfs]
>  [<ecdf9c24>] xfs_iomap_write_allocate+0x214/0x4a0 [xfs]
>  [<c02436da>] elv_merged_request+0xa/0x10
>  [<c024668e>] __make_request+0x4be/0x4d0
>  [<ecdf8ab7>] xfs_iomap+0x157/0x440 [xfs]
>  [<ecdf8d91>] xfs_iomap+0x431/0x440 [xfs]
>  [<c0155426>] bio_alloc+0xc6/0x1b0
>  [<ece1be8a>] xfs_bmap+0x1a/0x20 [xfs]
>  [<ece14999>] xfs_map_blocks+0x29/0x50 [xfs]
>  [<ece15741>] xfs_page_state_convert+0x491/0x5a0 [xfs]
>  [<c01d1220>] radix_tree_gang_lookup_tag+0x40/0x60
>  [<ece15d1f>] linvfs_writepage+0x4f/0xe0 [xfs]
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Fedor G Pikus (fpikus at gmail.com)

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