When I run my unionmount testsuite against overlayfs, I get the following
lockdep warning (unionmount is not in the kernel sources in this test):
================================================
[ BUG: lock held when returning to user space! ]
3.15.0-rc6-fsdevel+ #363 Tainted: G W
------------------------------------------------
mount/4183 is leaving the kernel with locks still held!
1 lock held by mount/4183:
#0: (sb_writers#8){.+.+.+}, at: [<ffffffff8112bf5b>] mnt_want_write+0x1c/0x40
The mounts involved look like:
lower_layer /lower tmpfs ro,seclabel,relatime 0 0
upper_layer /upper tmpfs rw,seclabel,relatime 0 0
overlayfs /mnt overlayfs rw,relatime,lowerdir=/lower,upperdir=/upper/upper,workdir=/upper/work 0 0
I get a busy inodes warning on unmounting /upper (/mnt unmounts okay):
BUG: Dentry ffff88002795feb8{i=2e8e,n=work} still in use (1) [unmount of tmpfs tmpfs]
------------[ cut here ]------------
WARNING: CPU: 0 PID: 2981 at /data/fs/linux-2.6-fscache/fs/dcache.c:1262 umount_check+0x76/0x7a()
Modules linked in:
CPU: 0 PID: 2981 Comm: umount Tainted: G W 3.15.0-rc6-fsdevel+ #363
Hardware name: /DG965RY, BIOS MQ96510J.86A.0816.2006.0716.2308 07/16/2006
0000000000000000 ffff8800383b7d38 ffffffff8148b669 0000000000000000
ffff8800383b7d70 ffffffff81038887 ffffffff81125407 ffff8800279368a0
00000000000005d0 ffff88003b76f630 ffff88002795feb8 ffff8800383b7d80
Call Trace:
[<ffffffff8148b669>] dump_stack+0x4d/0x66
[<ffffffff81038887>] warn_slowpath_common+0x7a/0x93
[<ffffffff81125407>] ? umount_check+0x76/0x7a
[<ffffffff8103893f>] warn_slowpath_null+0x15/0x17
[<ffffffff81125407>] umount_check+0x76/0x7a
[<ffffffff811238bc>] d_walk+0x134/0x2ff
[<ffffffff811251ab>] ? do_one_tree+0x21/0x34
[<ffffffff81125391>] ? dget_parent+0x13f/0x13f
[<ffffffff811251ab>] do_one_tree+0x21/0x34
[<ffffffff81125dbf>] shrink_dcache_for_umount+0x42/0x6b
[<ffffffff81112e73>] generic_shutdown_super+0x1c/0xe8
[<ffffffff8111309b>] kill_anon_super+0xd/0x17
[<ffffffff811130c3>] kill_litter_super+0x1e/0x21
[<ffffffff8111344e>] deactivate_locked_super+0x27/0x48
[<ffffffff81113ff5>] deactivate_super+0x39/0x3c
[<ffffffff8112bc50>] mntput_no_expire+0x237/0x258
[<ffffffff8112d001>] ? SyS_umount+0x3ba/0x3db
[<ffffffff8112d001>] SyS_umount+0x3ba/0x3db
[<ffffffff814923f4>] ? tracesys+0xdd/0xe2
[<ffffffff8100d737>] ? syscall_trace_enter+0x197/0x1eb
[<ffffffff814923f4>] tracesys+0xdd/0xe2
---[ end trace 11bb9aeb6ce29610 ]---
VFS: Busy inodes after unmount of tmpfs. Self-destruct in 5 seconds. Have a nice day...
--
To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
