Umount reiserfs partition caused crash on 2.6.18-rc3-mm2

Umount reiserfs partition caused crash on 2.6.18-rc3-mm2

[Lei CL Cheng]

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Hi,

I installed latest mm kernel 2.6.18-rc3-mm2 on ppc64 with RHEL4-U3.
And I made a reiserfs partition by mkfs command in this kernel.
But when I tried to umount this reiserfs partition, the kernel
crashed and xmon will be entered.

the steps:
 1. mkfs -t reiserfs -f --format 3.6 /dev/sdb
 2. mount /dev/sdb /mnt/tmp
 3. umount /mnt/tmp

Additional information:
./mkreiserfs -V
mkreiserfs 3.6.19 (2003 www.namesys.com)

The error message printed by xmon is like:
---------------------------------------------
  BUG: Dentry c0000000718178a0{i=3,n=.reiserfs_priv} still in use (1)
    [unmount
  of reiserfs sdb]
  kernel BUG in shrink_dcache_for_umount_subtree at fs/dcache.c:611!
  cpu 0x3: Vector: 700 (Program Check) at [c0000001667ef690]
    pc: c0000000000e06cc: .shrink_dcache_for_umount_subtree+0x214/0x364
    lr: c0000000000e06c8: .shrink_dcache_for_umount_subtree+0x210/0x364
    sp: c0000001667ef910
    msr: 8000000000029032
    current = 0xc00000007180b040
    paca    = 0xc000000000567800
    pid   = 5220, comm = umount
  kernel BUG in shrink_dcache_for_umount_subtree at fs/dcache.c:611!
  enter ? for help

  2:mon> t
  [c0000001667ef9a0] c0000000000e086c .shrink_dcache_for_umount+0x50/0x78
  [c0000001667efa20] c0000000000c9c74 .generic_shutdown_super+0x40/0x230
  [c0000001667efab0] c0000000000cb07c .kill_block_super+0x30/0x60
  [c0000001667efb40] c0000000000c9be0 .deactivate_super+0x8c/0xe0
  [c0000001667efbd0] c0000000000e69e8 .mntput_no_expire+0x84/0xcc
  [c0000001667efc60] c0000000000d36c4 .path_release_on_umount+0x30/0x48
  [c0000001667efcf0] c0000000000e75dc .sys_umount+0x264/0x294
  [c0000001667efe30] c00000000000861c syscall_exit+0x0/0x40
  --- Exception: c01 (System Call) at 000000000ff31f84
  SP (ffca1750) is in userspace

  2:mon> r
  R00 = c0000000000e06c8   R16 = 00000000ffffffff
  R01 = c0000001667ef910   R17 = 0000000010020000
  R02 = c000000000748448   R18 = 0000000000000000
  R03 = 0000000000000061   R19 = 00000000ffca1df8
  R04 = 8000000000001032   R20 = 0000000000000000
  R05 = 0000000000000000   R21 = 0000000000000000
  R06 = 8000000000b10393   R22 = 00000000100c0000
  R07 = 0000000000000000   R23 = 0000000000000000
  R08 = 0000000000000001   R24 = 0000000000000000
  R09 = c000000000594660   R25 = 0000000000000000
  R10 = c00000016763bbd8   R26 = c0000001667efdf0
  R11 = c000000000594660   R27 = 0000000000000000
  R12 = 0000000000004000   R28 = c000000169e0f800
  R13 = c000000000567800   R29 = c000000071817980
  R14 = 00000000ffca18d0   R30 = c0000000005bd348
  R15 = 0000000010020000   R31 = c0000000718178a0
  pc  = c0000000000e06cc .shrink_dcache_for_umount_subtree+0x214/0x364
  lr  = c0000000000e06c8 .shrink_dcache_for_umount_subtree+0x210/0x364
  msr = 8000000000029032   cr  = 24004424
  ctr = 8000000000132d10   xer = 000000000000000f   trap =  700

  2:mon> S
  msr  = 8000000000001032  sprg0= 0000000000000000
  pvr  = 00000000003a0201  sprg1= c000000000567600
  dec  = 00000000ad4830a1  sprg2= c000000000567600
  sp   = c00000016691ad50  sprg3= c000000000567600
  toc  = c000000000748448  dar  = c000000071794010

  -Thanks

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Re: Umount reiserfs partition caused crash on 2.6.18-rc3-mm2

[Olof Johansson]

On Tue, Aug 08, 2006 at 01:57:19PM +0800, Lei CL Cheng wrote:
> Hi,
> 
> I installed latest mm kernel 2.6.18-rc3-mm2 on ppc64 with RHEL4-U3.
> And I made a reiserfs partition by mkfs command in this kernel.
> But when I tried to umount this reiserfs partition, the kernel
> crashed and xmon will be entered.

Hi,

This doesn't at first look seem like a PPC-specific bug. You will probably
get more eyes on the problem if you report it on LKML instead.


-Olof

Re: Umount reiserfs partition caused crash on 2.6.18-rc3-mm2

[David Howells]

Olof Johansson <olof@lixom.net> wrote:

> This doesn't at first look seem like a PPC-specific bug. You will probably
> get more eyes on the problem if you report it on LKML instead.

That may be due to one of my patches, and if so it's not PPC specific.

Do you get a bug report looking something like this:

> BUG: Dentry ffff810037c573e8{i=3,n=.reiserfs_priv} still in use (1) [unmount of reiserfs hdc7]
> ----------- [cut here ] --------- [please bite here ] ---------
> Kernel BUG at fs/dcache.c:611

David