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[linux-lvm] "broken" snapshot volume -- how to remove?

Once more -- running "lvremove" on a snapshot volume causes a kernel BUG
(see attached file).

- vgck reports no corruption of lvm meta-data
- vgscan (without -D option) crashes as well (though not in the kernel)

What other information can I provide for someone to make sense of this?

I *have* to bring the vg into a consistent state and I urgently need to
drop the snapshot volume -- is there any tool to manipulate lvm purely in
userspace that can simply delete the snapshot volume?

Helge Bahmann <hcb chaoticmind net>                     /| \__
The past: Smart users in front of dumb terminals       /_|____\
                                                     _/\ |   __)
$ ./configure                                        \\ \|__/__|
checking whether build environment is sane... yes     \\/___/ |
checking for AIX... no (we already did this)            |

ksymoops 2.4.5 on i686 2.4.21-241-smp.  Options used
     -V (default)
     -k /proc/ksyms (default)
     -l /proc/modules (default)
     -o /lib/modules/2.4.21-241-smp/ (default)
     -m /boot/System.map-2.4.21-241-smp (default)

Warning: You did not tell me where to find symbol information.  I will
assume that the log matches the kernel and modules that are running
right now and I'll use the default options above for symbol resolution.
If the current kernel and/or modules do not match the log, you can get
more accurate output by telling me the kernel version and where to find
map, modules, ksyms etc.  ksymoops -h explains the options.

kernel BUG at memory.c:531!
invalid operand: 0000 2.4.21-241-smp #1 SMP Tue Aug 10 15:55:34 UTC 2004
CPU:    0
EIP:    0010:[<c0139ebb>]    Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010246
eax: 00000000   ebx: c10bfa50   ecx: 0000000b   edx: c27fe840
esi: c27ffd10   edi: 00000000   ebp: 00000012   esp: cdd03d68
ds: 0018   es: 0018   ss: 0018
Process lvremove (pid: 1804, stackpage=cdd03000)
Stack: c10bfa50 f541fea0 c013a358 c10bfa50 f5480000 f5480000 f5484a00 f54a5f76 
       f541fea0 f5480000 f54f8000 f54a3b7f f5480000 f595adc0 f5484b70 00000000 
       4004fe21 f54f8000 bfffed00 f54a084b 00000000 f54aafe0 ffffffff ccb19190 
Call Trace:         [<c013a358>] (20) [<f54a5f76>] (16) [<f54a3b7f>] (32)
  [<f54a084b>] (08) [<f54aafe0>] (12) [<c028bc44>] (68) [<c025d26d>] (20)
  [<c028ea96>] (08) [<c01421d5>] (48) [<c013b9cc>] (100) [<c013c078>] (52)
  [<c0170f20>] (16) [<c0156b05>] (56) [<c0156d01>] (28) [<c01550ea>] (28)
  [<c0154f68>] (28) [<c016b776>] (28) [<c0155382>] (24) [<c0109717>] (60)
Code: 0f 0b 13 02 86 eb 2e c0 eb c2 8d 74 26 00 8d bc 27 00 00 00 

>>EIP; c0139ebb <unpin_pte_page+5b/70>   <=====

>>ebx; c10bfa50 <_end+c1bd78/2d9c388>
>>edx; c27fe840 <_end+235ab68/2d9c388>
>>esi; c27ffd10 <_end+235c038/2d9c388>
>>esp; cdd03d68 <[ide-cd].data.end+424009/1b20301>

Trace; c013a358 <unmap_kiobuf+38/60>
Trace; f54a5f76 <[lvm-mod]lvm_snapshot_release+96/100>
Trace; f54a3b7f <[lvm-mod]lvm_do_lv_remove+13f/300>
Trace; f54a084b <[lvm-mod]lvm_chr_ioctl+39b/6d0>
Trace; f54aafe0 <[lvm-mod]lv_req+0/a0>
Trace; c028bc44 <tcp_clean_rtx_queue+334/340>
Trace; c025d26d <__kfree_skb+10d/170>
Trace; c028ea96 <tcp_rcv_established+4a6/880>
Trace; c01421d5 <filemap_nopage+1c5/240>
Trace; c013b9cc <do_no_page+dc/4c0>
Trace; c013c078 <handle_mm_fault+c8/200>
Trace; c0170f20 <dput+30/150>
Trace; c0156b05 <get_chrfops+155/170>
Trace; c0156d01 <chrdev_open+71/b0>
Trace; c01550ea <dentry_open+17a/1d0>
Trace; c0154f68 <filp_open+68/70>
Trace; c016b776 <sys_ioctl+f6/2d2>
Trace; c0155382 <sys_open+a2/c0>
Trace; c0109717 <system_call+33/38>

Code;  c0139ebb <unpin_pte_page+5b/70>
00000000 <_EIP>:
Code;  c0139ebb <unpin_pte_page+5b/70>   <=====
   0:   0f 0b                     ud2a      <=====
Code;  c0139ebd <unpin_pte_page+5d/70>
   2:   13 02                     adc    (%edx),%eax
Code;  c0139ebf <unpin_pte_page+5f/70>
   4:   86 eb                     xchg   %ch,%bl
Code;  c0139ec1 <unpin_pte_page+61/70>
   6:   2e                        cs
Code;  c0139ec2 <unpin_pte_page+62/70>
   7:   c0 eb c2                  shr    $0xc2,%bl
Code;  c0139ec5 <unpin_pte_page+65/70>
   a:   8d 74 26 00               lea    0x0(%esi,1),%esi
Code;  c0139ec9 <unpin_pte_page+69/70>
   e:   8d bc 27 00 00 00 00      lea    0x0(%edi,1),%edi

1 warning issued.  Results may not be reliable.

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