Re: Oops - 2.4.2-SGI_XFS_1.0.1_PR1

[Andrew Klaassen <ak@xxxxxxx>]

On Tue, Jun 26, 2001 at 11:46:12AM +1000, 
Keith Owens wrote:

> Capture the serial console output.  'bt' to trace the failing
> task is probably all you need at this stage.  For an oops it
> is usually only the current task that is interesting.  For
> loops and hangs, 'ps' and 'bta' are useful to get backtrace
> for all processes.

Okay...

This happened during... either test 13 or 14 or 15 of the checks
in the cmd/xfstests directory.  (Unfortunately, the screen saver
on the machine's console appears to have kicked in
overnight....(?))

Will anything else from kdb be useful to have before I reboot
and try again?

Andrew Klaassen


Unable to handle kernel NULL pointer dereference at virtual address 00000000
 printing eip:
c0156c6a
pgd entry f68ff000: 0000000000000000
pmd entry f68ff000: 0000000000000000
... pmd not present!

Entering kdb (current=0xf68b8000, pid 649) Oops: Oops
due to oops @ 0xc0156c6a
eax = 0x00000000 ebx = 0x00001000 ecx = 0x00000400 edx = 0xe6be8e60
esi = 0x00000001 edi = 0x00000000 esp = 0xf68b9ddc eip = 0xc0156c6a
ebp = 0x00003dbd xss = 0x00000018 xcs = 0x00000010 eflags = 0x00010246
xds = 0xe6be0018 xes = 0x00000018 origeax = 0xffffffff &regs = 0xf68b9da8
kdb> bt
    EBP       EIP         Function(args)
0x00003dbd 0xc0156c6a ext2_alloc_branch+0xf2 (0xf6b6a040, 0x2, 0x3dbc, 0xf68b9e)
                               kernel .text 0xc0100000 0xc0156b78 0xc0156d9c
           0xc01570d0 ext2_get_block+0x334 (0xf6b6a040, 0xc, 0xe6bd75a0, 0x1, 0)
                               kernel .text 0xc0100000 0xc0156d9c 0xc0157298
           0xc0135e21 __block_prepare_write+0x139 (0xf6b6a040, 0xc209bd48, 0x0,)
                               kernel .text 0xc0100000 0xc0135ce8 0xc0135fe4
           0xc0136776 block_prepare_write+0x22 (0xc209bd48, 0x0, 0x60, 0xc0156d)
                               kernel .text 0xc0100000 0xc0136754 0xc01367c4
           0xc01574b1 ext2_prepare_write+0x19 (0xf6978860, 0xc209bd48, 0x0, 0x6)
                               kernel .text 0xc0100000 0xc0157498 0xc01574b8
           0xc0127c39 generic_file_write+0x401 (0xf6978860, 0x4001900c, 0x60, 0)
                               kernel .text 0xc0100000 0xc0127838 0xc0127ec8
           0xc01338ba sys_write+0x8e (0x2, 0x40019000, 0x6c, 0x6c, 0x40019000)
                               kernel .text 0xc0100000 0xc013382c 0xc01338f0
           0xc0108edb system_call+0x33
                               kernel .text 0xc0100000 0xc0108ea8 0xc0108ee0