[uml-devel] kernel panic with 2.6.7-bb6

[uml-devel] kernel panic with 2.6.7-bb6

[Sebastian Böhm]

Hi,

I had a kernel panic while just hanging around in the shell (connected 
via ssh).

the host kernel is 2.6.7 , the client kernel is 2.6.7-bb6. (skas ; 
sysemu enabled ; no /dev/anon ; no COW; no hostfs (reiserfs); 
/dev/net/tun networking, some swap from a swap file in the udb 
root-filesystem, most on default in ".config", but absolute 
minimalistic, all uncesessary things removed (filesystems,sound, tt 
support, ...)  )

Do you have an idea why gdb did not stop at the kernel panic (I did 
"break panic"), but exited. So I am not able to provide a backtrace.


/sebastian



----------------------------
Kernel panic: Kernel mode fault at addr 0x40007, ip 0x0
In interrupt handler - not syncing

EIP: 0000:[<00000000>] CPU: 0 Not tainted EFLAGS: 00000000
    Not tainted
EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: 00000000
ESI: 00000000 EDI: 00000000 EBP: 00000000 DS: 0000 ES: 0000
Call Trace:  [<a0034c5d>] notifier_call_chain+0x2d/0x50
 [<a0028c4b>] panic+0xab/0x130
 [<a0022cb1>] arch_fixup+0x11/0x30
 [<a0016591>] segv+0x201/0x230
 [<a00193e1>] sig_handler_common_skas+0x81/0xa0

    [<a00168b8>] sig_handler+0x18/0x20
 [<a00147d3>] change_signals+0x73/0xa0
 [<a0016887>] segv_handler+0xd7/0xe0
 [<a0014832>] unblock_signals+0x12/0x20
 [<a00193e1>] sig_handler_common_skas+0x81/0xa0
 [<a00168b8>] sig_handler+0x18/0x20

    [<a00461e1>] free_block+0x31/0xd0
 [<a000f50e>] handle_IRQ_event+0x4e/0x70
 [<a000f6c4>] do_IRQ+0x94/0xd0
 [<a000fe0d>] sigio_handler+0x3d/0x130
 [<a00193e1>] sig_handler_common_skas+0x81/0xa0
 [<a00168b8>] sig_handler+0x18/0x20

    [<a00149ec>] set_signals+0xfc/0x1c0
 [<a00149ec>] set_signals+0xfc/0x1c0
 [<a00148c4>] get_signals+0x84/0xb0
 [<a00149ec>] set_signals+0xfc/0x1c0
 [<a00149ec>] set_signals+0xfc/0x1c0
 [<a00147d3>] change_signals+0x73/0xa0

    [<a00148c4>] get_signals+0x84/0xb0
 [<a00147d3>] change_signals+0x73/0xa0
 [<a0011761>] __virt_to_page+0x11/0x30
 [<a0046a07>] drain_array+0x67/0xa0
 [<a0046b67>] reap_timer_fnc+0x67/0x1c0
 [<a0046b00>] reap_timer_fnc+0x0/0x1c0

    [<a0030dc4>] run_timer_softirq+0xc4/0x190
 [<a002c975>] __do_softirq+0xa5/0xb0
 [<a002c9c5>] do_softirq+0x45/0x50
 [<a000f6fb>] do_IRQ+0xcb/0xd0
 [<a0015cd0>] timer_irq+0x150/0x190
 [<a0015f7b>] timer_handler+0x2b/0x30

    [<a00193e1>] sig_handler_common_skas+0x81/0xa0
 [<a0018d10>] start_kernel_proc+0x0/0x30
 [<a00189d0>] new_thread_handler+0x0/0x100
 [<a00168e9>] alarm_handler+0x29/0x60
 [<a00168b8>] sig_handler+0x18/0x20
 [<a00189d0>] new_thread_handler+0x0/0x100

    [<a0018d10>] start_kernel_proc+0x0/0x30
 [<a0012845>] default_idle+0x45/0x70
 [<a00149ec>] set_signals+0xfc/0x1c0
 [<a00149ec>] set_signals+0xfc/0x1c0
 [<a00149ec>] set_signals+0xfc/0x1c0
 [<a00183df>] switch_threads+0x5f/0x60

    [<a00148c4>] get_signals+0x84/0xb0
 [<a00147d3>] change_signals+0x73/0xa0
 [<a0014832>] unblock_signals+0x12/0x20
 [<a0025c67>] finish_task_switch+0x27/0x70
 [<a012a77f>] schedule+0x28f/0x400
 [<a00189d0>] new_thread_handler+0x0/0x100

    [<a0015b24>] idle_sleep+0x24/0x30
 [<a001285d>] default_idle+0x5d/0x70
 [<a00189d0>] new_thread_handler+0x0/0x100
 [<a000be91>] rest_init+0x21/0x30
 [<a000bf10>] init+0x0/0x100
 [<a0018d05>] init_idle_skas+0x25/0x30

    [<a0001549>] start_kernel+0x149/0x170
 [<a00012b0>] unknown_bootoption+0x0/0x120
 [<a0014812>] block_signals+0x12/0x20
 [<a0018d39>] start_kernel_proc+0x29/0x30
 [<a0018d10>] start_kernel_proc+0x0/0x30
 [<a00122e9>] run_kernel_thread+0x49/0x50

    [<a0018d10>] start_kernel_proc+0x0/0x30
 [<a00189d0>] new_thread_handler+0x0/0x100
 [<a00122ce>] run_kernel_thread+0x2e/0x50
 [<a0018d10>] start_kernel_proc+0x0/0x30
 [<a00189d0>] new_thread_handler+0x0/0x100
 [<a0018a7e>] new_thread_handler+0xae/0x100

    [<a0018d10>] start_kernel_proc+0x0/0x30
 [<a00189d0>] new_thread_handler+0x0/0x100
 [<a0018aed>] new_thread_proc+0x1d/0x30

 ---Type <return> to continue, or q <return> to quit---Detaching after 
fork from child process 1937.


Program exited with code 01.
(gdb)



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Re: [uml-devel] kernel panic with 2.6.7-bb6

[Paolo Giarrusso]

Alle 02:19, mercoledì 25 agosto 2004, Sebastian Böhm ha scritto:
> Hi,
>
> I had a kernel panic while just hanging around in the shell (connected
> via ssh).
>
> the host kernel is 2.6.7 , the client kernel is 2.6.7-bb6. (skas ;
> sysemu enabled ; no /dev/anon ; no COW; no hostfs (reiserfs);
> /dev/net/tun networking, some swap from a swap file in the udb
> root-filesystem, most on default in ".config", but absolute
> minimalistic, all uncesessary things removed (filesystems,sound, tt
> support, ...)  )
>
> Do you have an idea why gdb did not stop at the kernel panic (I did
> "break panic"), but exited. So I am not able to provide a backtrace.

Well, there are at least some known bugs in -bb6 which are fixed in the new 
2.6 mainline patches. I fear that is not repeatable (but the 2.4 bug you 
reported some time ago was repeatable, and I feel like this is a similar one, 
so you could try).

Note that to compile them you need to disable module support. Anyway, what the 
kernel has output actually *is* a backtrace. And why didn't you press Enter 
at the end, as it asks in the message? Anyway, it looks like something 
known... it's not normal a so long backtrace. Again, try the later mainline 
patches.

> Kernel panic: Kernel mode fault at addr 0x40007, ip 0x0
> In interrupt handler - not syncing
>
> EIP: 0000:[<00000000>] CPU: 0 Not tainted EFLAGS: 00000000
>     Not tainted
> EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: 00000000
> ESI: 00000000 EDI: 00000000 EBP: 00000000 DS: 0000 ES: 0000
> Call Trace:  [<a0034c5d>] notifier_call_chain+0x2d/0x50
>  [<a0028c4b>] panic+0xab/0x130
>  [<a0022cb1>] arch_fixup+0x11/0x30
>  [<a0016591>] segv+0x201/0x230
>  [<a00193e1>] sig_handler_common_skas+0x81/0xa0
>
>     [<a00168b8>] sig_handler+0x18/0x20
>  [<a00147d3>] change_signals+0x73/0xa0
>  [<a0016887>] segv_handler+0xd7/0xe0
>  [<a0014832>] unblock_signals+0x12/0x20
>  [<a00193e1>] sig_handler_common_skas+0x81/0xa0
>  [<a00168b8>] sig_handler+0x18/0x20
>
>     [<a00461e1>] free_block+0x31/0xd0
>  [<a000f50e>] handle_IRQ_event+0x4e/0x70
>  [<a000f6c4>] do_IRQ+0x94/0xd0
>  [<a000fe0d>] sigio_handler+0x3d/0x130
>  [<a00193e1>] sig_handler_common_skas+0x81/0xa0
>  [<a00168b8>] sig_handler+0x18/0x20
>
>     [<a00149ec>] set_signals+0xfc/0x1c0
>  [<a00149ec>] set_signals+0xfc/0x1c0
>  [<a00148c4>] get_signals+0x84/0xb0
>  [<a00149ec>] set_signals+0xfc/0x1c0
>  [<a00149ec>] set_signals+0xfc/0x1c0
>  [<a00147d3>] change_signals+0x73/0xa0
>
>     [<a00148c4>] get_signals+0x84/0xb0
>  [<a00147d3>] change_signals+0x73/0xa0
>  [<a0011761>] __virt_to_page+0x11/0x30
>  [<a0046a07>] drain_array+0x67/0xa0
>  [<a0046b67>] reap_timer_fnc+0x67/0x1c0
>  [<a0046b00>] reap_timer_fnc+0x0/0x1c0
>
>     [<a0030dc4>] run_timer_softirq+0xc4/0x190
>  [<a002c975>] __do_softirq+0xa5/0xb0
>  [<a002c9c5>] do_softirq+0x45/0x50
>  [<a000f6fb>] do_IRQ+0xcb/0xd0
>  [<a0015cd0>] timer_irq+0x150/0x190
>  [<a0015f7b>] timer_handler+0x2b/0x30
>
>     [<a00193e1>] sig_handler_common_skas+0x81/0xa0
>  [<a0018d10>] start_kernel_proc+0x0/0x30
>  [<a00189d0>] new_thread_handler+0x0/0x100
>  [<a00168e9>] alarm_handler+0x29/0x60
>  [<a00168b8>] sig_handler+0x18/0x20
>  [<a00189d0>] new_thread_handler+0x0/0x100
>
>     [<a0018d10>] start_kernel_proc+0x0/0x30
>  [<a0012845>] default_idle+0x45/0x70
>  [<a00149ec>] set_signals+0xfc/0x1c0
>  [<a00149ec>] set_signals+0xfc/0x1c0
>  [<a00149ec>] set_signals+0xfc/0x1c0
>  [<a00183df>] switch_threads+0x5f/0x60
>
>     [<a00148c4>] get_signals+0x84/0xb0
>  [<a00147d3>] change_signals+0x73/0xa0
>  [<a0014832>] unblock_signals+0x12/0x20
>  [<a0025c67>] finish_task_switch+0x27/0x70
>  [<a012a77f>] schedule+0x28f/0x400
>  [<a00189d0>] new_thread_handler+0x0/0x100
>
>     [<a0015b24>] idle_sleep+0x24/0x30
>  [<a001285d>] default_idle+0x5d/0x70
>  [<a00189d0>] new_thread_handler+0x0/0x100
>  [<a000be91>] rest_init+0x21/0x30
>  [<a000bf10>] init+0x0/0x100
>  [<a0018d05>] init_idle_skas+0x25/0x30
>
>     [<a0001549>] start_kernel+0x149/0x170
>  [<a00012b0>] unknown_bootoption+0x0/0x120
>  [<a0014812>] block_signals+0x12/0x20
>  [<a0018d39>] start_kernel_proc+0x29/0x30
>  [<a0018d10>] start_kernel_proc+0x0/0x30
>  [<a00122e9>] run_kernel_thread+0x49/0x50
>
>     [<a0018d10>] start_kernel_proc+0x0/0x30
>  [<a00189d0>] new_thread_handler+0x0/0x100
>  [<a00122ce>] run_kernel_thread+0x2e/0x50
>  [<a0018d10>] start_kernel_proc+0x0/0x30
>  [<a00189d0>] new_thread_handler+0x0/0x100
>  [<a0018a7e>] new_thread_handler+0xae/0x100
>
>     [<a0018d10>] start_kernel_proc+0x0/0x30
>  [<a00189d0>] new_thread_handler+0x0/0x100
>  [<a0018aed>] new_thread_proc+0x1d/0x30
>
>  ---Type <return> to continue, or q <return> to quit---Detaching after
> fork from child process 1937.
>
>
> Program exited with code 01.
> (gdb)
>
>
>
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-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729


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Re: [uml-devel] kernel panic with 2.6.7-bb6

[Jeff Dike]

seb@exse.net said:
> Do you have an idea why gdb did not stop at the kernel panic (I did
> "break panic"), but exited. So I am not able to provide a backtrace. 

What was the panic message, at least?

				Jeff



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