Kernel panic with 2.6.11.6

Hmmm, I think I need to recompile the kernel with debug information. In any case, here are the results:

myserver:~#
Program received signal SIGSEGV, Segmentation fault. 0x0806b21f in chan_interrupt ()
(gdb) bt
#0 0x0806b21f in chan_interrupt ()
#1 0x00000000 in ?? ()
(gdb) c
Continuing.

Kernel panic - not syncing: Kernel mode fault at addr 0xd, ip 0x0

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: 
08297338:  [<0808c30d>] notifier_call_chain+0x2d/0x50
08297348:  [<0818fe16>] bust_spinlocks+0x46/0x50
08297358:  [<0807d131>] panic+0x71/0x120
08297378:  [<08066997>] segv+0x217/0x250
082973d8:  [<08064eb5>] change_signals+0x65/0x90
08297468:  [<08066cb7>] segv_handler+0xd7/0xe0
08297488:  [<080697f0>] sig_handler_common_skas+0x90/0xe0
082974b8:  [<08075e87>] sig_handler+0x17/0x20
08297508:  [<0806b21f>] chan_interrupt+0xf/0x130
08297530:  [<08064f70>] enable_mask+0x50/0x70
08297550:  [<08064fc3>] get_signals+0x33/0x50
082975b0:  [<0806505d>] set_signals+0x7d/0x130
08297620:  [<0806505d>] set_signals+0x7d/0x130
082976b0:  [<0806505d>] set_signals+0x7d/0x130
08297710:  [<0806505d>] set_signals+0x7d/0x130
08297740:  [<08064eb5>] change_signals+0x65/0x90
082977d0:  [<0806b85f>] line_interrupt+0x2f/0x40
082977f0:  [<08099900>] handle_IRQ_event+0x30/0x80
08297820:  [<080999f8>] __do_IRQ+0xa8/0xf0
08297840:  [<0805fea3>] do_IRQ+0x33/0x50
08297850:  [<0806004a>] sigio_handler+0xda/0x140
08297870:  [<080697f0>] sig_handler_common_skas+0x90/0xe0
08297894:  [<080690e0>] start_kernel_proc+0x0/0x40
0829789c:  [<08068cc0>] new_thread_handler+0x0/0x120
082978a0:  [<08075e87>] sig_handler+0x17/0x20
082978cc:  [<080690e0>] start_kernel_proc+0x0/0x40
082978d0:  [<08068cc0>] new_thread_handler+0x0/0x120
08297a40:  [<08068937>] switch_threads+0x87/0x90
08297a70:  [<08064eb5>] change_signals+0x65/0x90
08297b10:  [<08064f0f>] unblock_signals+0xf/0x20
08297b20:  [<080799e7>] finish_task_switch+0x27/0x70
08297b40:  [<08244353>] schedule+0x2e3/0x4e0
08297b90:  [<08065e93>] idle_sleep+0x23/0x30
08297bac:  [<08068cc0>] new_thread_handler+0x0/0x120
08297bb0:  [<08062f37>] default_idle+0x67/0x70
08297bd0:  [<080690d8>] init_idle_skas+0x28/0x30
08297bd4:  [<0805f210>] init+0x0/0x110
08297be0:  [<080495b3>] start_kernel+0x163/0x1a0
08297bf4:  [<08049130>] unknown_bootoption+0x0/0x200
08297c00:  [<0806910b>] start_kernel_proc+0x2b/0x40
08297c04:  [<080690e0>] start_kernel_proc+0x0/0x40
08297c10:  [<08062978>] run_kernel_thread+0x78/0x80
08297c28:  [<080690e0>] start_kernel_proc+0x0/0x40
08297c30:  [<08068cc0>] new_thread_handler+0x0/0x120
08297c38:  [<08062940>] run_kernel_thread+0x40/0x80
08297cd4:  [<080690e0>] start_kernel_proc+0x0/0x40
08297cdc:  [<08068cc0>] new_thread_handler+0x0/0x120
08297ce0:  [<08068d8e>] new_thread_handler+0xce/0x120
08297ce4:  [<080690e0>] start_kernel_proc+0x0/0x40
08297d40:  [<08068cc0>] new_thread_handler+0x0/0x120

Program exited with code 01.
(gdb)

Close. What I'd really like is to get it to crash when it's running under gdb, with a breakpoint on panic. Then, 'bt' to gdb at that point.

That gives the true call trace, plus line number information.

This tells me that chan_interrupt segfaulted, but not necessarily exactly where, and a lot of the other stuff on the stack isn't in the true call chain.

Jeff

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