Wessel, Jason wrote:
>>-----Original Message-----
>>From: Sergei Shtylyov [mailto:[EMAIL PROTECTED]
>> I suppose KGDB makes no use of neither of the unwinder
>>itself nor of the extra section it adds to the kernel, so I
>>should have said gdb gets muddled in that section -- mine
>>wasn't all that new, custome patched 6.3... should try the
>>newer one yet...
> I would recommend using gdb 6.6. I had good luck with it and seeing
> reasonable stack back traces. Until I switch to gdb 6.6 I found that the
> x86_64 did not work to well in fact.
Yeah, I've tried 6.6.50 and it kind of worked... until on hit of do_mount()
breakpoint and doing a backtrace, the kernel went all random and colorful. :-)
It still was able to hit the b/p once more, but then got SIGSEGV on the next
hit:
(gdb) c
Continuing.
Program received signal SIGSEGV, Segmentation fault.
0xffffffff802985a9 in do_mount (dev_name=0xffff81007e119000 "/dev/root",
dir_name=0xffff81007dc2b000 "/",
type_page=0xffffffffc0ed0020 <Address 0xffffffffc0ed0020 out of bounds>,
flags=0xffffffffc0ed0020, data_page=0xffff81007e427000)
at fs/namespace.c:1384
1384 if ((flags & MS_MGC_MSK) == MS_MGC_VAL)
(gdb) c
Continuing.
Can't send signals to this remote system. SIGSEGV not sent.
[New Thread 23]
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 23]
__switch_to_end () at kernel/sched.c:2344
2344 struct mm_struct *mm = rq->prev_mm;
> With respect to the need for the stack unwind perhaps that will still need to
> be added back I am not sure...
> You mentioned there might be some problems with the ARM arch which I have yet
> to see for myself.
Unwinder isn't available (and reportably isn't usable) for ARM, and the
kernel fails to link with CONFIG_UNWIND_INFO=y.
> Jason.
WBR, Sergei
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