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![]() Josef has suggested that this is not necessary. Removing it also avoids this lockdep splat (after the new sb_internal locking stuff was added): [ 604.090449] ====================================================== [ 604.114819] [ INFO: possible circular locking dependency detected ] [ 604.139262] 3.6.0-rc2-ceph-00144-g463b030 #1 Not tainted [ 604.162193] ------------------------------------------------------- [ 604.186139] btrfs-cleaner/6669 is trying to acquire lock: [ 604.209555] (sb_internal#2){.+.+..}, at: [<ffffffffa0042b84>] start_transaction+0x124/0x430 [btrfs] [ 604.257100] [ 604.257100] but task is already holding lock: [ 604.300366] (&fs_info->cleanup_work_sem){.+.+..}, at: [<ffffffffa0048002>] btrfs_run_delayed_iputs+0x72/0x130 [btrfs] [ 604.352989] [ 604.352989] which lock already depends on the new lock. [ 604.352989] [ 604.427104] [ 604.427104] the existing dependency chain (in reverse order) is: [ 604.478493] [ 604.478493] -> #1 (&fs_info->cleanup_work_sem){.+.+..}: [ 604.529313] [<ffffffff810b2c82>] lock_acquire+0xa2/0x140 [ 604.559621] [<ffffffff81632b69>] down_read+0x39/0x4e [ 604.589382] [<ffffffffa004db98>] btrfs_lookup_dentry+0x218/0x550 [btrfs] [ 604.596161] btrfs: unlinked 1 orphans [ 604.675002] [<ffffffffa006aadd>] create_subvol+0x62d/0x690 [btrfs] [ 604.708859] [<ffffffffa006d666>] btrfs_mksubvol.isra.52+0x346/0x3a0 [btrfs] [ 604.772466] [<ffffffffa006d7f2>] btrfs_ioctl_snap_create_transid+0x132/0x190 [btrfs] [ 604.842245] [<ffffffffa006d8ae>] btrfs_ioctl_snap_create+0x5e/0x80 [btrfs] [ 604.912852] [<ffffffffa00708ae>] btrfs_ioctl+0x138e/0x1990 [btrfs] [ 604.951888] [<ffffffff8118e9b8>] do_vfs_ioctl+0x98/0x560 [ 604.989961] [<ffffffff8118ef11>] sys_ioctl+0x91/0xa0 [ 605.026628] [<ffffffff8163d569>] system_call_fastpath+0x16/0x1b [ 605.064404] [ 605.064404] -> #0 (sb_internal#2){.+.+..}: [ 605.126832] [<ffffffff810b25e8>] __lock_acquire+0x1ac8/0x1b90 [ 605.163671] [<ffffffff810b2c82>] lock_acquire+0xa2/0x140 [ 605.200228] [<ffffffff8117dac6>] __sb_start_write+0xc6/0x1b0 [ 605.236818] [<ffffffffa0042b84>] start_transaction+0x124/0x430 [btrfs] [ 605.274029] [<ffffffffa00431a3>] btrfs_start_transaction+0x13/0x20 [btrfs] [ 605.340520] [<ffffffffa004ccfa>] btrfs_evict_inode+0x19a/0x330 [btrfs] [ 605.378720] [<ffffffff811972c8>] evict+0xb8/0x1c0 [ 605.416057] [<ffffffff811974d5>] iput+0x105/0x210 [ 605.452373] [<ffffffffa0048082>] btrfs_run_delayed_iputs+0xf2/0x130 [btrfs] [ 605.521627] [<ffffffffa003b5e1>] cleaner_kthread+0xa1/0x120 [btrfs] [ 605.560520] [<ffffffff810791ee>] kthread+0xae/0xc0 [ 605.598094] [<ffffffff8163e744>] kernel_thread_helper+0x4/0x10 [ 605.636499] [ 605.636499] other info that might help us debug this: [ 605.636499] [ 605.736504] Possible unsafe locking scenario: [ 605.736504] [ 605.801931] CPU0 CPU1 [ 605.835126] ---- ---- [ 605.867093] lock(&fs_info->cleanup_work_sem); [ 605.898594] lock(sb_internal#2); [ 605.931954] lock(&fs_info->cleanup_work_sem); [ 605.965359] lock(sb_internal#2); [ 605.994758] [ 605.994758] *** DEADLOCK *** [ 605.994758] [ 606.075281] 2 locks held by btrfs-cleaner/6669: [ 606.104528] #0: (&fs_info->cleaner_mutex){+.+...}, at: [<ffffffffa003b5d5>] cleaner_kthread+0x95/0x120 [btrfs] [ 606.165626] #1: (&fs_info->cleanup_work_sem){.+.+..}, at: [<ffffffffa0048002>] btrfs_run_delayed_iputs+0x72/0x130 [btrfs] [ 606.231297] [ 606.231297] stack backtrace: [ 606.287723] Pid: 6669, comm: btrfs-cleaner Not tainted 3.6.0-rc2-ceph-00144-g463b030 #1 [ 606.347823] Call Trace: [ 606.376184] [<ffffffff8162a77c>] print_circular_bug+0x1fb/0x20c [ 606.409243] [<ffffffff810b25e8>] __lock_acquire+0x1ac8/0x1b90 [ 606.441343] [<ffffffffa0042b84>] ? start_transaction+0x124/0x430 [btrfs] [ 606.474583] [<ffffffff810b2c82>] lock_acquire+0xa2/0x140 [ 606.505934] [<ffffffffa0042b84>] ? start_transaction+0x124/0x430 [btrfs] [ 606.539429] [<ffffffff8132babd>] ? do_raw_spin_unlock+0x5d/0xb0 [ 606.571719] [<ffffffff8117dac6>] __sb_start_write+0xc6/0x1b0 [ 606.603498] [<ffffffffa0042b84>] ? start_transaction+0x124/0x430 [btrfs] [ 606.637405] [<ffffffffa0042b84>] ? start_transaction+0x124/0x430 [btrfs] [ 606.670165] [<ffffffff81172e75>] ? kmem_cache_alloc+0xb5/0x160 [ 606.702144] [<ffffffffa0042b84>] start_transaction+0x124/0x430 [btrfs] [ 606.735562] [<ffffffffa00256a6>] ? block_rsv_add_bytes+0x56/0x80 [btrfs] [ 606.769861] [<ffffffffa00431a3>] btrfs_start_transaction+0x13/0x20 [btrfs] [ 606.804575] [<ffffffffa004ccfa>] btrfs_evict_inode+0x19a/0x330 [btrfs] [ 606.838756] [<ffffffff81634c6b>] ? _raw_spin_unlock+0x2b/0x40 [ 606.872010] [<ffffffff811972c8>] evict+0xb8/0x1c0 [ 606.903800] [<ffffffff811974d5>] iput+0x105/0x210 [ 606.935416] [<ffffffffa0048082>] btrfs_run_delayed_iputs+0xf2/0x130 [btrfs] [ 606.970510] [<ffffffffa003b5d5>] ? cleaner_kthread+0x95/0x120 [btrfs] [ 607.005648] [<ffffffffa003b5e1>] cleaner_kthread+0xa1/0x120 [btrfs] [ 607.040724] [<ffffffffa003b540>] ? btrfs_destroy_delayed_refs.isra.102+0x220/0x220 [btrfs] [ 607.104740] [<ffffffff810791ee>] kthread+0xae/0xc0 [ 607.137119] [<ffffffff810b379d>] ? trace_hardirqs_on+0xd/0x10 [ 607.169797] [<ffffffff8163e744>] kernel_thread_helper+0x4/0x10 [ 607.202472] [<ffffffff81635430>] ? retint_restore_args+0x13/0x13 [ 607.235884] [<ffffffff81079140>] ? flush_kthread_work+0x1a0/0x1a0 [ 607.268731] [<ffffffff8163e740>] ? gs_change+0x13/0x13 Signed-off-by: Sage Weil <sage@inktank.com> |
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.. | ||
9p | ||
adfs | ||
affs | ||
afs | ||
autofs4 | ||
befs | ||
bfs | ||
btrfs | ||
cachefiles | ||
ceph | ||
cifs | ||
coda | ||
configfs | ||
cramfs | ||
debugfs | ||
devpts | ||
dlm | ||
ecryptfs | ||
efs | ||
exofs | ||
exportfs | ||
ext2 | ||
ext3 | ||
ext4 | ||
fat | ||
freevxfs | ||
fscache | ||
fuse | ||
gfs2 | ||
hfs | ||
hfsplus | ||
hostfs | ||
hpfs | ||
hppfs | ||
hugetlbfs | ||
isofs | ||
jbd | ||
jbd2 | ||
jffs2 | ||
jfs | ||
lockd | ||
logfs | ||
minix | ||
ncpfs | ||
nfs | ||
nfs_common | ||
nfsd | ||
nilfs2 | ||
nls | ||
notify | ||
ntfs | ||
ocfs2 | ||
omfs | ||
openpromfs | ||
proc | ||
pstore | ||
qnx4 | ||
qnx6 | ||
quota | ||
ramfs | ||
reiserfs | ||
romfs | ||
squashfs | ||
sysfs | ||
sysv | ||
ubifs | ||
udf | ||
ufs | ||
xfs | ||
aio.c | ||
anon_inodes.c | ||
attr.c | ||
bad_inode.c | ||
binfmt_aout.c | ||
binfmt_elf.c | ||
binfmt_elf_fdpic.c | ||
binfmt_em86.c | ||
binfmt_flat.c | ||
binfmt_misc.c | ||
binfmt_script.c | ||
binfmt_som.c | ||
bio-integrity.c | ||
bio.c | ||
block_dev.c | ||
buffer.c | ||
char_dev.c | ||
compat.c | ||
compat_binfmt_elf.c | ||
compat_ioctl.c | ||
dcache.c | ||
dcookies.c | ||
direct-io.c | ||
drop_caches.c | ||
eventfd.c | ||
eventpoll.c | ||
exec.c | ||
fcntl.c | ||
fhandle.c | ||
fifo.c | ||
file.c | ||
file_table.c | ||
filesystems.c | ||
fs-writeback.c | ||
fs_struct.c | ||
generic_acl.c | ||
inode.c | ||
internal.h | ||
ioctl.c | ||
ioprio.c | ||
Kconfig | ||
Kconfig.binfmt | ||
libfs.c | ||
locks.c | ||
Makefile | ||
mbcache.c | ||
mount.h | ||
mpage.c | ||
namei.c | ||
namespace.c | ||
no-block.c | ||
open.c | ||
pipe.c | ||
pnode.c | ||
pnode.h | ||
posix_acl.c | ||
proc_namespace.c | ||
read_write.c | ||
read_write.h | ||
readdir.c | ||
select.c | ||
seq_file.c | ||
signalfd.c | ||
splice.c | ||
stack.c | ||
stat.c | ||
statfs.c | ||
super.c | ||
sync.c | ||
timerfd.c | ||
utimes.c | ||
xattr.c | ||
xattr_acl.c |