Hi.
I got following BUG trace.
This is violation of BUG_ON(!buffer_locked(bh)) check on submit_bh() function.
In write_dev_supers(), if wait parameter is set and buffer_uptodate() check
is negative, submit_bh() is executed and hit above BUG_ON.
So I fixed this issue.
Thanks.
Jun 9 00:41:32 dl580 kernel: ------------[ cut here ]------------
Jun 9 00:41:32 dl580 kernel: kernel BUG at fs/buffer.c:2933!
Jun 9 00:41:32 dl580 kernel: invalid opcode: 0000 [#1] SMP
Jun 9 00:41:32 dl580 kernel: last sysfs file:
/sys/devices/system/cpu/cpu7/cache/index1/sha
red_cpu_map
Jun 9 00:41:32 dl580 kernel: CPU 3
Jun 9 00:41:32 dl580 kernel: Modules linked in: btrfs zlib_deflate ext4 jbd2
crc16 sg qla2x
xx scsi_transport_fc autofs4 i2c_dev i2c_core sunrpc ipv6 serio_raw
tg3 libphy ata_piix libata shpchp rtc_cmos rtc_core rtc_lib cciss sd_mod
scsi_mod ext3 jbd [
last unloaded: scsi_transport_fc]
Jun 9 00:41:32 dl580 kernel: Pid: 5207, comm: umount Tainted: G W
2.6.30-rc6 #1 Pro
Liant DL580 G3
Jun 9 00:41:32 dl580 kernel: RIP: 0010:[<ffffffff802c458b>]
[<ffffffff802c458b>] submit_bh
+0x1a/0x105
Jun 9 00:41:32 dl580 kernel: RSP: 0018:ffff8801f46e5bf8 EFLAGS: 00010246
Jun 9 00:41:32 dl580 kernel: RAX: 0000000000000028 RBX: ffff88018a7ea420 RCX:
0000000000000
000
Jun 9 00:41:32 dl580 kernel: RDX: ffff88018a7ea420 RSI: ffff88018a7ea420 RDI:
0000000000000
419
Jun 9 00:41:32 dl580 kernel: RBP: ffff8801f46e5c18 R08: ffffffff802c533d R09:
0000000000000
000
Jun 9 00:41:32 dl580 kernel: R10: 0000000000000001 R11: 0000000000000088 R12:
ffff88021d448
248
Jun 9 00:41:32 dl580 kernel: R13: 0000000000000419 R14: ffff8802191dacbb R15:
0000000000000
000
Jun 9 00:41:32 dl580 kernel: FS: 00007fd64fef3760(0000)
GS:ffff880028150000(0000) knlGS:00
00000000000000
Jun 9 00:41:32 dl580 kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
Jun 9 00:41:32 dl580 kernel: CR2: 000000000044ef40 CR3: 0000000104287000 CR4:
0000000000000
6e0
Jun 9 00:41:32 dl580 kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000
000
Jun 9 00:41:32 dl580 kernel: DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
0000000000000
400
Jun 9 00:41:32 dl580 kernel: Process umount (pid: 5207, threadinfo
ffff8801f46e4000, task f
fff8801e1168000)
Jun 9 00:41:32 dl580 kernel: Stack:
Jun 9 00:41:32 dl580 kernel: 0000000000000003 ffff88018a7ea420
ffff88021d448248 0000000000
000003
Jun 9 00:41:32 dl580 kernel: ffff8801f46e5c68 ffffffffa02d9979
0000000000000000 0000000100
000001
Jun 9 00:41:32 dl580 kernel: 0000000100000000 ffff88021d448248
0000000000000000 ffff880219
1dacbb
Jun 9 00:41:32 dl580 kernel: Call Trace:
Jun 9 00:41:33 dl580 kernel: [<ffffffffa02d9979>]
write_dev_supers+0x1eb/0x258 [btrfs]
Jun 9 00:41:33 dl580 kernel: [<ffffffffa02d9b6d>]
write_all_supers+0x187/0x1c8 [btrfs]
Jun 9 00:41:33 dl580 kernel: [<ffffffffa02d9bbc>] write_ctree_super+0xe/0x10
[btrfs]
Jun 9 00:41:33 dl580 kernel: [<ffffffffa02de39f>]
btrfs_commit_transaction+0x6bb/0x841 [bt
rfs]
Jun 9 00:41:33 dl580 kernel: [<ffffffff80246914>] ?
autoremove_wake_function+0x0/0x38
Jun 9 00:41:33 dl580 kernel: [<ffffffffa02c14ed>] btrfs_sync_fs+0x67/0x72
[btrfs]
Jun 9 00:41:33 dl580 kernel: [<ffffffff802e6e3a>] quota_sync_sb+0x42/0xf3
Jun 9 00:41:33 dl580 kernel: [<ffffffff802e6f14>] sync_dquots+0x29/0x138
Jun 9 00:41:33 dl580 kernel: [<ffffffff802a8c29>] __fsync_super+0x1e/0x7b
Jun 9 00:41:33 dl580 kernel: [<ffffffff802a8c97>] fsync_super+0x11/0x22
Jun 9 00:41:33 dl580 kernel: [<ffffffff802a8ea9>]
generic_shutdown_super+0x26/0xe2
Jun 9 00:41:33 dl580 kernel: [<ffffffff802a8fb6>] kill_anon_super+0x17/0x3b
Jun 9 00:41:33 dl580 kernel: [<ffffffff802a92e8>] deactivate_super+0x62/0x77
Jun 9 00:41:33 dl580 kernel: [<ffffffff802bb7ae>] mntput_no_expire+0xec/0x12c
Jun 9 00:41:33 dl580 kernel: [<ffffffff802bbcff>] sys_umount+0x2c5/0x31c
Jun 9 00:41:33 dl580 kernel: [<ffffffff8020aeeb>] system_call_fastpath+0x16/0x
Jun 9 00:41:33 dl580 kernel: Code: e0 eb ec 44 89 e8 48 83 c4 18 5b 41 5c 41
5d 5d c3 55 48
89 e5 41 55 41 54 53 48 83 ec 08 41 89 fd 48 89 f3 48 8b 06 a8 04 75 04 <0f>
0b eb fe a8 20
75 04 0f 0b eb fe 48 83 7e 38 00 75 04 0f 0b
Jun 9 00:41:33 dl580 kernel: RIP [<ffffffff802c458b>] submit_bh+0x1a/0x105
Jun 9 00:41:33 dl580 kernel: RSP <ffff8801f46e5bf8>
Jun 9 00:41:33 dl580 kernel: ---[ end trace 4eaa2a86a8e2da24 ]---
Signed-off-by: Hisashi Hifumi <hifumi.hisa...@oss.ntt.co.jp>
--- linux-2.6.30-rc8.org/fs/btrfs/disk-io.c 2009-06-04 16:26:25.000000000
+0900
+++ linux-2.6.30-rc8.btrfs/fs/btrfs/disk-io.c 2009-06-08 18:42:46.000000000
+0900
@@ -2045,6 +2045,9 @@ static int write_dev_supers(struct btrfs
if (buffer_uptodate(bh)) {
brelse(bh);
continue;
+ } else {
+ get_bh(bh);
+ lock_buffer(bh);
}
} else {
btrfs_set_super_bytenr(sb, bytenr);
--
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