[linux-lvm] Xen, LVM, Snapshots Random Kernel Panics

Norbert Phillipps nphillipps at smytheonline.com
Mon Jul 30 17:22:46 UTC 2007

Hi all,

I'm currently running lvm 2.02.25, and device-mapper 1.02.19 on  
kernel with Xen 3.1 on Gentoo Linux

I randomly have kernel panics when creating snapshots and also when  
removing snapshots.

Attached is one of the kernel panics that I have seen while creating  
a snapshot.  I'm trying to find a stable combination of kernel, lvm,  
and Xen version.


------------[ cut here ]------------
kernel BUG at mm/mempool.c:121!
invalid opcode: 0000 [#1]
Modules linked in: ipv6 nfs lockd nfs_acl sunrpc bridge llc  
dm_snapshot dm_mod aoe qla2xxx i2c_i801 i2c_core firmware_class e1000  
uhci_hcd evdev
CPU:    0
EIP:    0061:[<c013d66b>]    Not tainted VLI
EFLAGS: 00010282   ( #5)
EIP is at mempool_resize+0x137/0x16c
eax: ec5a6900   ebx: ffffffe0   ecx: 000000d0   edx: ffffffe0
esi: e9395b00   edi: f07f5080   ebp: ec5a6900   esp: e8317d5c
ds: 007b   es: 007b   ss: 0069
Process vgchange (pid: 8179, ti=e8316000 task=e873da70 task.ti=e8316000)
Stack: 00692000 000000d0 ffffffe0 80000000 ffffffe0 e9395b00 f07f5080  
        ee24a3c8 00000000 e8d289c0 ee24a5cd e873da70 c012d034  
e8317d94 e8317d94
        c0156c7e e93962c0 e9395b00 f07f5080 ee06ebf1 f07f5080  
e93964c0 00000000
Call Trace:
  [<ee24a3c8>] resize_pool+0x47/0xb2 [dm_mod]
  [<ee24a5cd>] kcopyd_client_destroy+0x84/0xc9 [dm_mod]
  [<c012d034>] autoremove_wake_function+0x0/0x37
  [<c0156c7e>] kfree+0xe/0x7d
  [<ee06ebf1>] snapshot_dtr+0x85/0xcf [dm_snapshot]
  [<ee246d73>] dm_table_put+0x55/0xbd [dm_mod]
  [<ee245b0e>] dm_put+0x6f/0x110 [dm_mod]
  [<ee249561>] dev_remove+0x76/0xa4 [dm_mod]
  [<ee249b48>] ctl_ioctl+0x1eb/0x255 [dm_mod]
  [<c0107457>] monotonic_clock+0x37/0x74
  [<ee2494eb>] dev_remove+0x0/0xa4 [dm_mod]
  [<c0164874>] do_ioctl+0x64/0x6d
  [<c01648cd>] vfs_ioctl+0x50/0x278
  [<c0164b29>] sys_ioctl+0x34/0x53
  [<c0104c34>] syscall_call+0x7/0xb
  [<c0320033>] unix_dgram_sendmsg+0x2f9/0x48a
Code: 8b 45 08 3b 45 04 0f 8d 4c ff ff ff 8b 14 24 89 e8 e8 c4 93 1e  
00 8b 55 10 8b 44 24 04 ff 55 14 89 c3 85 c0 75 bf e9 37 ff ff ff  
<0f> 0b eb fe 8b 14 24 89 e8 e8 a1 93 1e 00 8b 55 10 89 d8 ff 55
EIP: [<c013d66b>] mempool_resize+0x137/0x16c SS:ESP 0069:e8317d5c
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