Le 12.07.2005 11:17, Andrew Morton wrote:
> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.13-rc2/2.6.13-rc2-mm2/

Hello Andrew,

I just got this oops.

device-mapper: 4.4.0-ioctl (2005-01-12) initialised: dm-devel@redhat.com
Unable to handle kernel NULL pointer dereference at virtual address 00000094
 printing eip:
d08612ec
*pde = 00000000
Oops: 0000 [#1]
last sysfs file:
Modules linked in: dm_mod joydev usbhid uhci_hcd usbcore video hotkey configfs
CPU:    0
EIP:    0060:[<d08612ec>]    Not tainted VLI
EFLAGS: 00010246   (2.6.13-rc2-mm2)
EIP is at suspend_targets+0x8/0x42 [dm_mod]
eax: 00000000   ebx: cf764340   ecx: 00000000   edx: 00000000
esi: 00000000   edi: 00000000   ebp: cf06bec4   esp: cf06beb8
ds: 007b   es: 007b   ss: 0068
Process lvm2 (pid: 1532, threadinfo=cf06a000 task=cfa3e520)
Stack: cf764340 00000000 ffffffea cf06becc d0861330 cf06bf20 d085ff99 00000000
       cfa3e520 c0114664 00000000 00000000 00000000 00000000 00000000 00000000
       cfa3e520 c0114664 00000000 00000000 00000000 cf06bf20 d0861e0f cf615aa0
Call Trace:
 [<c01038e1>] show_stack+0x76/0x7e
 [<c01039ea>] show_registers+0xea/0x152
 [<c0103b8e>] die+0xc2/0x13c
 [<c0113348>] do_page_fault+0x394/0x4d4
 [<c0103583>] error_code+0x4f/0x54
 [<d0861330>] dm_table_presuspend_targets+0xa/0xc [dm_mod]
 [<d085ff99>] dm_suspend+0x79/0x1a3 [dm_mod]
 [<d0862b51>] do_resume+0xee/0x173 [dm_mod]
 [<d0862beb>] dev_suspend+0x15/0x17 [dm_mod]
 [<d0863ae3>] ctl_ioctl+0xcb/0x10d [dm_mod]
 [<c0156830>] do_ioctl+0x40/0x49
 [<c0156a61>] vfs_ioctl+0x179/0x187
 [<c0156a99>] sys_ioctl+0x2a/0x45
 [<c0102a7f>] sysenter_past_esp+0x54/0x75
Code: 5e c9 c3 55 8b 80 88 00 00 00 89 e5 c9 c3 55 05 9c 00 00 00 89 e5 c9 c3 55 8b 80 98 00 00 00 89 e5 c9 c3 55 89 e5 57 89 d7 56 53 <8b> 88 94 00 00 00 8b 80 88 00 00 00 48 83 f8 ff 74 23 85 ff 8d


Please see below :
- disassembly output of suspend_targets
- normal output of "dmsetup status" (kernel 2.6.13-rc2-mm1).
- full dmesg output
- .config

--
laurent


$ objdump -d dm-table.o
...00000ed0 <suspend_targets>:
     ed0:       55                      push   %ebp
     ed1:       89 e5                   mov    %esp,%ebp
     ed3:       57                      push   %edi
     ed4:       89 d7                   mov    %edx,%edi
     ed6:       56                      push   %esi
     ed7:       53                      push   %ebx
     ed8:       8b 88 94 00 00 00       mov    0x94(%eax),%ecx
     ede:       8b 80 88 00 00 00       mov    0x88(%eax),%eax
     ee4:       48                      dec    %eax
     ee5:       83 f8 ff                cmp    $0xffffffff,%eax
     ee8:       74 23                   je     f0d <suspend_targets+0x3d>
     eea:       85 ff                   test   %edi,%edi
     eec:       8d 70 ff                lea    0xffffffff(%eax),%esi
     eef:       8d 59 2c                lea    0x2c(%ecx),%ebx
     ef2:       8b 41 04                mov    0x4(%ecx),%eax
     ef5:       74 05                   je     efc <suspend_targets+0x2c>
     ef7:       8b 50 28                mov    0x28(%eax),%edx
     efa:       eb 03                   jmp    eff <suspend_targets+0x2f>
     efc:       8b 50 24                mov    0x24(%eax),%edx
     eff:       85 d2                   test   %edx,%edx
     f01:       74 04                   je     f07 <suspend_targets+0x37>
     f03:       89 c8                   mov    %ecx,%eax
     f05:       ff d2                   call   *%edx
     f07:       89 d9                   mov    %ebx,%ecx
     f09:       89 f0                   mov    %esi,%eax
     f0b:       eb d8                   jmp    ee5 <suspend_targets+0x15>
     f0d:       5b                      pop    %ebx
     f0e:       5e                      pop    %esi
     f0f:       5f                      pop    %edi
     f10:       c9                      leave
     f11:       c3                      ret
....

# dmsetup status
vglinux1-lvhome: 0 7340032 linear
vglinux1-lvhome: 7340032 1048576 linear
vglinux1-lvtmp: 0 106496 linear
vglinux1-lvusr: 0 4194304 linear
vglinux1-lvusr: 4194304 212992 linear
vglinux1-lvusr: 4407296 835584 linear
vglinux1-lvvar: 0 409600 linear
vglinux1-lvvar: 409600 245760 linear
crypt-swap2: 0 1590434 crypt
crypt-swap1: 0 128457 crypt
vglinux1-test: 0 1310720 linear