Got some more information. I installed Debian on another disk ("rescue")
running 2.6.32, pulled the latest btrfs module code from git, applied an
earlier mentioned patch[1], then compiled and loaded the new module.
It's able to mount the volume initially...
Jan 3 14:46:57 rescue kernel: [ 25.984141] Btrfs loaded
Jan 3 14:46:57 rescue kernel: [ 25.984711] device fsid
334a5cd99de23fc4-ed77fc1dc6f59780 devid 1 transid 29665 /dev/sdb3
Jan 3 14:46:57 rescue kernel: [ 25.985137] btrfs: use compression
But after a little activity (chrooting in and running "apt-get update"),
the apt-get freezes and I get many hundreds of thousands of these:
Jan 3 14:47:30 rescue kernel: [ 59.275031] parent transid verify
failed on 111181824 wanted 29645 found 27038
Eventually, I get this:
Jan 3 14:50:31 rescue kernel: [ 240.364274] INFO: task
btrfs-transacti:1400 blocked for more than 120 seconds.
Jan 3 14:50:31 rescue kernel: [ 240.364337] "echo 0
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Jan 3 14:50:31 rescue kernel: [ 240.364399] btrfs-transac D
0000000000000000 0 1400 2 0x00000000
Jan 3 14:50:31 rescue kernel: [ 240.364515] ffff88021f06b880
0000000000000046 0000000000000000 ffffffffa02d4e98
Jan 3 14:50:31 rescue kernel: [ 240.364692] ffffea0007646b10
0000000000000000 000000000000f8a0 ffff88021cb75fd8
Jan 3 14:50:31 rescue kernel: [ 240.364867] 00000000000155c0
00000000000155c0 ffff88021dc37810 ffff88021dc37b08
Jan 3 14:50:31 rescue kernel: [ 240.365042] Call Trace:
Jan 3 14:50:31 rescue kernel: [ 240.365097] [<ffffffffa02d4e98>] ?
update_block_group+0x1b1/0x1d3 [btrfs]
Jan 3 14:50:31 rescue kernel: [ 240.365150] [<ffffffff8106bebd>] ?
ktime_get_ts+0x68/0xb2
Jan 3 14:50:31 rescue kernel: [ 240.365201] [<ffffffff810989b2>] ?
delayacct_end+0x74/0x7f
Jan 3 14:50:31 rescue kernel: [ 240.365251] [<ffffffff810b2c91>] ?
sync_page+0x0/0x46
Jan 3 14:50:31 rescue kernel: [ 240.365300] [<ffffffff812e412e>] ?
io_schedule+0x73/0xb7
Jan 3 14:50:31 rescue kernel: [ 240.365349] [<ffffffff810b2cd2>] ?
sync_page+0x41/0x46
Jan 3 14:50:31 rescue kernel: [ 240.365397] [<ffffffff812e462e>] ?
__wait_on_bit+0x41/0x70
Jan 3 14:50:31 rescue kernel: [ 240.365447] [<ffffffff810b2e56>] ?
wait_on_page_bit+0x6b/0x71
Jan 3 14:50:31 rescue kernel: [ 240.365496] [<ffffffff81064a9c>] ?
wake_bit_function+0x0/0x23
Jan 3 14:50:31 rescue kernel: [ 240.365547] [<ffffffff810ba94e>] ?
pagevec_lookup_tag+0x1a/0x21
Jan 3 14:50:31 rescue kernel: [ 240.365596] [<ffffffff810b35f2>] ?
wait_on_page_writeback_range+0x69/0x11b
Jan 3 14:50:31 rescue kernel: [ 240.365655] [<ffffffffa02f83d9>] ?
btrfs_wait_ordered_range+0x6b/0x112 [btrfs]
Jan 3 14:50:31 rescue kernel: [ 240.365725] [<ffffffffa02f865e>] ?
btrfs_run_ordered_operations+0x12d/0x1b6 [btrfs]
Jan 3 14:50:31 rescue kernel: [ 240.365794] [<ffffffffa02e353f>] ?
btrfs_commit_transaction+0x29f/0x618 [btrfs]
Jan 3 14:50:31 rescue kernel: [ 240.365857] [<ffffffff81064a6e>] ?
autoremove_wake_function+0x0/0x2e
Jan 3 14:50:31 rescue kernel: [ 240.365913] [<ffffffffa02df2cf>] ?
transaction_kthread+0x173/0x204 [btrfs]
Jan 3 14:50:31 rescue kernel: [ 240.365970] [<ffffffffa02df15c>] ?
transaction_kthread+0x0/0x204 [btrfs]
Jan 3 14:50:31 rescue kernel: [ 240.366021] [<ffffffff810647a1>] ?
kthread+0x79/0x81
Jan 3 14:50:31 rescue kernel: [ 240.366070] [<ffffffff81011b6a>] ?
child_rip+0xa/0x20
Jan 3 14:50:31 rescue kernel: [ 240.366118] [<ffffffff81064728>] ?
kthread+0x0/0x81
Jan 3 14:50:31 rescue kernel: [ 240.366166] [<ffffffff81011b60>] ?
child_rip+0x0/0x20
Jan 3 14:50:31 rescue kernel: [ 240.366214] INFO: task apt-get:1411
blocked for more than 120 seconds.
Jan 3 14:50:31 rescue kernel: [ 240.366264] "echo 0
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Jan 3 14:50:31 rescue kernel: [ 240.366326] apt-get D
0000000000000002 0 1411 1407 0x00000004
Jan 3 14:50:31 rescue kernel: [ 240.366433] ffff88021dc32a60
0000000000000082 0000005001c9f000 0000000001c9f000
Jan 3 14:50:31 rescue kernel: [ 240.366608] 0000000000000000
0000000000000000 000000000000f8a0 ffff88021b869fd8
Jan 3 14:50:31 rescue kernel: [ 240.366782] 00000000000155c0
00000000000155c0 ffff88021c3d69f0 ffff88021c3d6ce8
Jan 3 14:50:31 rescue kernel: [ 240.366957] Call Trace:
Jan 3 14:50:31 rescue kernel: [ 240.367002] [<ffffffff810b7df3>] ?
__pagevec_free+0x69/0x80
Jan 3 14:50:31 rescue kernel: [ 240.367051] [<ffffffff81017131>] ?
read_tsc+0xa/0x20
Jan 3 14:50:31 rescue kernel: [ 240.367100] [<ffffffff810b2c91>] ?
sync_page+0x0/0x46
Jan 3 14:50:31 rescue kernel: [ 240.367148] [<ffffffff812e412e>] ?
io_schedule+0x73/0xb7
Jan 3 14:50:31 rescue kernel: [ 240.367197] [<ffffffff810b2cd2>] ?
sync_page+0x41/0x46
Jan 3 14:50:31 rescue kernel: [ 240.367245] [<ffffffff812e462e>] ?
__wait_on_bit+0x41/0x70
Jan 3 14:50:31 rescue kernel: [ 240.367294] [<ffffffff810b2e56>] ?
wait_on_page_bit+0x6b/0x71
Jan 3 14:50:31 rescue kernel: [ 240.367343] [<ffffffff81064a9c>] ?
wake_bit_function+0x0/0x23
Jan 3 14:50:31 rescue kernel: [ 240.367393] [<ffffffff810bb33e>] ?
lock_page+0x9/0x1f
Jan 3 14:50:31 rescue kernel: [ 240.367441] [<ffffffff810bba88>] ?
truncate_inode_pages_range+0x257/0x2b0
Jan 3 14:50:31 rescue kernel: [ 240.367500] [<ffffffffa02e9881>] ?
btrfs_delete_inode+0x27/0x132 [btrfs]
Jan 3 14:50:31 rescue kernel: [ 240.367557] [<ffffffffa02e985a>] ?
btrfs_delete_inode+0x0/0x132 [btrfs]
Jan 3 14:50:31 rescue kernel: [ 240.367609] [<ffffffff810fd840>] ?
generic_delete_inode+0xdc/0x168
Jan 3 14:50:31 rescue kernel: [ 240.367659] [<ffffffff810fa1ff>] ?
d_kill+0x34/0x55
Jan 3 14:50:31 rescue kernel: [ 240.367707] [<ffffffff810fbd76>] ?
dput+0x13d/0x149
Jan 3 14:50:31 rescue kernel: [ 240.367755] [<ffffffff810f651c>] ?
sys_renameat+0x184/0x1e9
Jan 3 14:50:31 rescue kernel: [ 240.367804] [<ffffffff81064a6e>] ?
autoremove_wake_function+0x0/0x2e
Jan 3 14:50:31 rescue kernel: [ 240.367854] [<ffffffff8106bebd>] ?
ktime_get_ts+0x68/0xb2
Jan 3 14:50:31 rescue kernel: [ 240.367904] [<ffffffff810ec812>] ?
vfs_read+0xca/0xff
Jan 3 14:50:31 rescue kernel: [ 240.367953] [<ffffffff81010b02>] ?
system_call_fastpath+0x16/0x1b
Any ideas? I'm happy to apply any patches you suggest and try again...
Steve
[1]http://www.mail-archive.com/linux-btrfs@xxxxxxxxxxxxxxx/msg03686.html
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