Re: BUG: Dentry still in use during umount in 2.6.21-rc5-git6

[Jan Kara <jack@suse.cz>]

> One of my autoboot test clients gave me this during shutdown. It used
> reiserfs and autofs and NFS heavily.
  Jeff has a fix for this bug so it should go away soon... Thanks for
report anyway :).

									Honza

> Unmounting file systems
> BUG: Dentry ffff8100f3693a40{i=2352220,n=xattrs} still in use (1) [unmount of reiserfs sda9]
> ------------[ cut here ]------------
> kernel BUG at /mnt/dm-2/newautoboot/autoboot/lsrc/mainline/linux/fs/dcache.c:623!
> invalid opcode: 0000 [1] SMP 
> CPU 1 
> Modules linked in:
> Pid: 15791, comm: umount Not tainted 2.6.21-rc5-git6 #44
> RIP: 0010:[<ffffffff80287454>]  [<ffffffff80287454>] shrink_dcache_for_umount_subtree+0x178/0x250
> RSP: 0018:ffff8100f5f67e18  EFLAGS: 00010292
> RAX: 0000000000000060 RBX: ffff8100f3693a40 RCX: 0000000000005207
> RDX: 00000000ffffffff RSI: 0000000000000046 RDI: 0000000000014661
> RBP: ffff8100f6dc9cc0 R08: 00000000000000a0 R09: 00000005ffffffff
> R10: 0000000000000000 R11: 0000000000000000 R12: ffff8100f3693aa0
> R13: 0000000000014661 R14: 000000000050ea70 R15: 000000000050ead0
> FS:  00002adc863a86d0(0000) GS:ffff8100f7fdc1c0(0000) knlGS:00000000b7be38d0
> CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> CR2: 00002adc8626a688 CR3: 00000000f628b000 CR4: 00000000000006e0
> Process umount (pid: 15791, threadinfo ffff8100f5f66000, task ffff8100f7a08100)
> Stack:  ffff810004dab218 ffff810004dab000 ffffffff80558860 ffff810004dab000
>  0000000000000000 ffffffff8028815b ffff810004dab000 ffffffff8027a1a5
>  0000000000000000 ffff8100f6c50980 ffffffff806c1600 ffffffff8027a2a4
> Call Trace:
>  [<ffffffff8028815b>] shrink_dcache_for_umount+0x2f/0x3d
>  [<ffffffff8027a1a5>] generic_shutdown_super+0x19/0xf2
>  [<ffffffff8027a2a4>] kill_block_super+0x26/0x3b
>  [<ffffffff8027a350>] deactivate_super+0x47/0x60
>  [<ffffffff8028bf94>] sys_umount+0x1f7/0x22a
>  [<ffffffff8027b64d>] sys_newstat+0x19/0x31
>  [<ffffffff8020932e>] system_call+0x7e/0x83
> 
> 
> Code: 0f 0b eb fe 48 8b 6b 28 48 39 dd 75 04 31 ed eb 04 f0 ff 4d 
> RIP  [<ffffffff80287454>] shrink_dcache_for_umount_subtree+0x178/0x250
>  RSP <ffff8100f5f67e18>
> /etc/init.d/boot.d/K14boot.localfs: line 93: 15791 Segmentation fault      umount -avt noproc,nonfs,nonfs4,nosmbfs,nocifs,notmpfs
> 
> 
> 
> -Andi
> -
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-- 
Jan Kara <jack@suse.cz>
SuSE CR Labs
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