On Tue, Nov 29, 2011 at 09:18:35AM +0800, Liu Bo wrote:
> a) For the first one (last_snapshot bug),
>
> The test involves three processes (derived from Chris):
>
> mkfs.btrfs /dev/xxx
> mount /dev/xxx /mnt
>
> 1) run compilebench -i 30 --makej -D /mnt
>
> Let compilebench run until it starts the create phase.
>
> 2) run synctest -f -u -n 200 -t 3 /mnt
> 3) for x in `seq 1 200` ; do btrfs subvol snap /mnt /mnt/snap$x ; sleep 0.5 ;
> done
I have hit following 2 warnings during this test. Phase 1 was at compile
stage, 2 and 3 were running. I did not see them during first run and other
activity at the filestystem was 'du -sh /mnt'.
mount options: compress-force=lzo,discard,space_cache,autodefrag,inode_cache
Label: none uuid: 79f4160b-81f8-46ed-968c-968cb17a2e87
Total devices 4 FS bytes used 7.76GB
devid 4 size 13.96GB used 2.26GB path /dev/sdb4
devid 3 size 13.96GB used 2.26GB path /dev/sdb3
devid 2 size 13.96GB used 3.00GB path /dev/sdb2
devid 1 size 13.96GB used 3.02GB path /dev/sdb1
fresh and default mkfs
430 WARN_ON(root->ref_cows && trans->transaction->transid !=
431 root->fs_info->running_transaction->transid);
432 WARN_ON(root->ref_cows && trans->transid < root->last_trans);
20433.473713] ------------[ cut here ]------------
[20433.478825] WARNING: at fs/btrfs/ctree.c:432 __btrfs_cow_block+0x429/0x5e0
[btrfs]()
[20433.487148] Hardware name: Santa Rosa platform
[20433.487150] Modules linked in: btrfs aoe sr_mod ide_cd_mod cdrom loop [last
unloaded: btrfs]
[20433.487162] Pid: 12099, comm: btrfs Tainted: G W 3.1.0-default+ #80
[20433.487165] Call Trace:
[20433.487174] [<ffffffff81051c0f>] warn_slowpath_common+0x7f/0xc0
[20433.487179] [<ffffffff81051c6a>] warn_slowpath_null+0x1a/0x20
[20433.487190] [<ffffffffa00d6909>] __btrfs_cow_block+0x429/0x5e0 [btrfs]
[20433.487196] [<ffffffff8108a429>] ? trace_hardirqs_off_caller+0x29/0xc0
[20433.487201] [<ffffffff8108a7ed>] ? lock_release_holdtime+0x3d/0x1c0
[20433.487218] [<ffffffffa0129cc0>] ? btrfs_set_lock_blocking_rw+0x50/0xb0
[btrfs]
[20433.487230] [<ffffffffa00d6c66>] btrfs_cow_block+0x1a6/0x3d0 [btrfs]
[20433.487236] [<ffffffff818b90cb>] ? _raw_write_unlock+0x2b/0x50
[20433.487247] [<ffffffffa00dae70>] btrfs_search_slot+0x300/0xd20 [btrfs]
[20433.487262] [<ffffffffa00eedcf>] btrfs_lookup_inode+0x2f/0xa0 [btrfs]
[20433.487279] [<ffffffffa00fd186>] btrfs_update_inode_item+0x66/0x120 [btrfs]
[20433.487296] [<ffffffffa00fe63b>] btrfs_update_inode+0xab/0xc0 [btrfs]
[20433.487313] [<ffffffffa0134e61>] ? lookup_free_ino_inode+0x51/0xe0 [btrfs]
[20433.487327] [<ffffffffa00ef515>] btrfs_save_ino_cache+0x145/0x2f0 [btrfs]
[20433.487342] [<ffffffffa00f7464>] ? commit_fs_roots+0xa4/0x1c0 [btrfs]
[20433.487357] [<ffffffffa00f7494>] commit_fs_roots+0xd4/0x1c0 [btrfs]
[20433.487373] [<ffffffffa00f86a4>] btrfs_commit_transaction+0x454/0x900
[btrfs]
[20433.487378] [<ffffffff8108a7ed>] ? lock_release_holdtime+0x3d/0x1c0
[20433.487395] [<ffffffffa0126e08>] ? btrfs_mksubvol+0x298/0x360 [btrfs]
[20433.487400] [<ffffffff81076550>] ? wake_up_bit+0x40/0x40
[20433.487405] [<ffffffff8134738e>] ? do_raw_spin_unlock+0x5e/0xb0
[20433.487421] [<ffffffffa0126ec8>] btrfs_mksubvol+0x358/0x360 [btrfs]
[20433.487427] [<ffffffff8110ece3>] ? might_fault+0x53/0xb0
[20433.487443] [<ffffffffa0126fd0>]
btrfs_ioctl_snap_create_transid+0x100/0x160 [btrfs]
[20433.487448] [<ffffffff8110ece3>] ? might_fault+0x53/0xb0
[20433.487464] [<ffffffffa01271ad>]
btrfs_ioctl_snap_create_v2.clone.0+0xfd/0x110 [btrfs]
[20433.487482] [<ffffffffa0128a78>] btrfs_ioctl+0x588/0x1080 [btrfs]
[20433.487487] [<ffffffff818bd9c0>] ? do_page_fault+0x2d0/0x580
[20433.487492] [<ffffffff8107d6cf>] ? local_clock+0x6f/0x80
[20433.487498] [<ffffffff811473e8>] do_vfs_ioctl+0x98/0x560
[20433.487502] [<ffffffff818b9fd9>] ? retint_swapgs+0x13/0x1b
[20433.487507] [<ffffffff811478ff>] sys_ioctl+0x4f/0x80
[20433.487512] [<ffffffff818c21c2>] system_call_fastpath+0x16/0x1b
[20433.487515] ---[ end trace d93007cf8d0a8eac ]---
[20433.487576] ------------[ cut here ]------------
[20433.487587] WARNING: at fs/btrfs/ctree.c:432 __btrfs_cow_block+0x429/0x5e0
[btrfs]()
[20433.487590] Hardware name: Santa Rosa platform
[20433.487592] Modules linked in: btrfs aoe sr_mod ide_cd_mod cdrom loop [last
unloaded: btrfs]
[20433.487601] Pid: 12099, comm: btrfs Tainted: G W 3.1.0-default+ #80
[20433.487603] Call Trace:
[20433.487608] [<ffffffff81051c0f>] warn_slowpath_common+0x7f/0xc0
[20433.487613] [<ffffffff81051c6a>] warn_slowpath_null+0x1a/0x20
[20433.487623] [<ffffffffa00d6909>] __btrfs_cow_block+0x429/0x5e0 [btrfs]
[20433.487628] [<ffffffff8108a429>] ? trace_hardirqs_off_caller+0x29/0xc0
[20433.487633] [<ffffffff8108a7ed>] ? lock_release_holdtime+0x3d/0x1c0
[20433.487649] [<ffffffffa0129cc0>] ? btrfs_set_lock_blocking_rw+0x50/0xb0
[btrfs]
[20433.487660] [<ffffffffa00d6c66>] btrfs_cow_block+0x1a6/0x3d0 [btrfs]
[20433.487665] [<ffffffff818b90cb>] ? _raw_write_unlock+0x2b/0x50
[20433.487676] [<ffffffffa00dae70>] btrfs_search_slot+0x300/0xd20 [btrfs]
[20433.487691] [<ffffffffa00eedcf>] btrfs_lookup_inode+0x2f/0xa0 [btrfs]
[20433.487707] [<ffffffffa00fd186>] btrfs_update_inode_item+0x66/0x120 [btrfs]
[20433.487723] [<ffffffffa00fe63b>] btrfs_update_inode+0xab/0xc0 [btrfs]
[20433.487739] [<ffffffffa0134e61>] ? lookup_free_ino_inode+0x51/0xe0 [btrfs]
[20433.487753] [<ffffffffa00ef515>] btrfs_save_ino_cache+0x145/0x2f0 [btrfs]
[20433.487769] [<ffffffffa00f7464>] ? commit_fs_roots+0xa4/0x1c0 [btrfs]
[20433.487784] [<ffffffffa00f7494>] commit_fs_roots+0xd4/0x1c0 [btrfs]
[20433.487800] [<ffffffffa00f86a4>] btrfs_commit_transaction+0x454/0x900
[btrfs]
[20433.487805] [<ffffffff8108a7ed>] ? lock_release_holdtime+0x3d/0x1c0
[20433.487821] [<ffffffffa0126e08>] ? btrfs_mksubvol+0x298/0x360 [btrfs]
[20433.487826] [<ffffffff81076550>] ? wake_up_bit+0x40/0x40
[20433.487830] [<ffffffff8134738e>] ? do_raw_spin_unlock+0x5e/0xb0
[20433.487846] [<ffffffffa0126ec8>] btrfs_mksubvol+0x358/0x360 [btrfs]
[20433.487851] [<ffffffff8110ece3>] ? might_fault+0x53/0xb0
[20433.487867] [<ffffffffa0126fd0>]
btrfs_ioctl_snap_create_transid+0x100/0x160 [btrfs]
[20433.487872] [<ffffffff8110ece3>] ? might_fault+0x53/0xb0
[20433.487888] [<ffffffffa01271ad>]
btrfs_ioctl_snap_create_v2.clone.0+0xfd/0x110 [btrfs]
[20433.487905] [<ffffffffa0128a78>] btrfs_ioctl+0x588/0x1080 [btrfs]
[20433.487909] [<ffffffff818bd9c0>] ? do_page_fault+0x2d0/0x580
[20433.487913] [<ffffffff8107d6cf>] ? local_clock+0x6f/0x80
[20433.487918] [<ffffffff811473e8>] do_vfs_ioctl+0x98/0x560
[20433.487922] [<ffffffff818b9fd9>] ? retint_swapgs+0x13/0x1b
[20433.487926] [<ffffffff811478ff>] sys_ioctl+0x4f/0x80
[20433.487931] [<ffffffff818c21c2>] system_call_fastpath+0x16/0x1b
[20433.487934] ---[ end trace d93007cf8d0a8ead ]---
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