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This was with 2.6.16.9
There's an nfs export from an xfs on an lvm on a raid5 on some
libata/sata disks.
(cc'ing xfs since I recall rumoured(?) badness in old nfs/xfs/md/lvm
setups and xfs_sendfile is mentioned)
dmesg had:
Bad page state in process 'nfsd'
page:b1602060 flags:0x80000008 mapping:00000000 mapcount:0 count:16777216
Trying to fix it up, but a reboot is needed
Backtrace:
[<b013bda2>] bad_page+0x62/0x90
[<b013c1c8>] prep_new_page+0x78/0x80
[<b013c6b6>] buffered_rmqueue+0xf6/0x1f0
[<b013c8e2>] get_page_from_freelist+0x92/0xb0
[<b013c956>] __alloc_pages+0x56/0x300
[<b013f00c>] __do_page_cache_readahead+0xdc/0x120
[<b013f1b9>] blockable_page_cache_readahead+0x59/0xd0
[<b013f2aa>] make_ahead_window+0x7a/0xb0
[<b013f39f>] page_cache_readahead+0xbf/0x1b0
[<b0138b91>] do_generic_mapping_read+0x4b1/0x4c0
[<b01390e2>] generic_file_sendfile+0x62/0x70
[<f1097080>] nfsd_read_actor+0x0/0xd0 [nfsd]
[<b021bab0>] xfs_sendfile+0xc0/0x190
[<f1097080>] nfsd_read_actor+0x0/0xd0 [nfsd]
[<b0217fe8>] linvfs_open+0x48/0x50
[<b0217f97>] linvfs_sendfile+0x57/0x60
[<f1097080>] nfsd_read_actor+0x0/0xd0 [nfsd]
[<f109734f>] nfsd_vfs_read+0x1ff/0x370 [nfsd]
[<f1097080>] nfsd_read_actor+0x0/0xd0 [nfsd]
[<f1097933>] nfsd_read+0x103/0x120 [nfsd]
[<f109e234>] nfsd3_proc_read+0xe4/0x170 [nfsd]
[<f1093649>] nfsd_dispatch+0xd9/0x210 [nfsd]
[<f10e4792>] svc_process+0x482/0x670 [sunrpc]
[<f10933fc>] nfsd+0x18c/0x300 [nfsd]
[<f1093270>] nfsd+0x0/0x300 [nfsd]
[<b0101391>] kernel_thread_helper+0x5/0x14
more info on request but I have rebooted as suggested.
David
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