On Tuesday 20 April 2010 08:33:11 Bernhard Walle wrote:

Am 19.04.2010 20:12, schrieb Andreas Jaeger:

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(gdb) disassemble /r apbt_cpuhp_notify Dump of assembler code for function apbt_cpuhp_notify: 0xc02240f0: 00 00 add %al,(%eax) 0xc02240f2: 00 00 add %al,(%eax) 0xc02240f4: 00 00 add %al,(%eax) 0xc02240f6: 00 00 add %al,(%eax) 0xc02240f8: 00 00 add %al,(%eax) 0xc02240fa: 00 00 add %al,(%eax) 0xc02240fc: 00 00 add %al,(%eax) 0xc02240fe: 00 00 add %al,(%eax) 0xc0224100: 00 00 add %al,(%eax)

Looks like gdb reads the wrong values from /proc/kcore.

Should I open a bugreport?

Could you give crash live debugging a try? Just invoking crash with the kernel should work:

% crash -s /boot/vmlinux-2.6.34-rc4-4-desktop crash> p jiffies

Does not work for me: crash -s /boot/vmlinux-2.6.34-rc4-4-desktop crash: cannot determine idle task addresses from init_tasks[] or runqueues[] crash: cannot resolve "init_task_union" Another bug report?

The disassemble feature of GDB should also work without /proc/kcore, just with the kernel image. Doesn't it?

Yes, that works and looks sane: gdb /boot/vmlinux-2.6.34-rc4-4-desktop ... (gdb) disassemble apbt_cpuhp_notify Dump of assembler code for function apbt_cpuhp_notify: 0xc02240f0 <+0>: push %ebp 0xc02240f1 <+1>: mov $0xc0a03fe0,%eax 0xc02240f6 <+6>: mov %esp,%ebp 0xc02240f8 <+8>: sub $0x14,%esp 0xc02240fb <+11>: mov %ebx,-0x8(%ebp) Andreas -- Andreas Jaeger, Program Manager openSUSE, aj@{novell.com,opensuse.org} Twitter: jaegerandi | Identica: jaegerandi SUSE LINUX Products GmbH, GF: Markus Rex, HRB 16746 (AG Nürnberg) Maxfeldstr. 5, 90409 Nürnberg, Germany GPG fingerprint = 93A3 365E CE47 B889 DF7F FED1 389A 563C C272 A126

On Tuesday 20 April 2010 21:17:53 Bernhard Walle wrote:

Am 20.04.2010 10:30, schrieb Andreas Jaeger:

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Looks like gdb reads the wrong values from /proc/kcore.

Should I open a bugreport?

Would be reasonable.

OK, bnc#598461.

Looks like that's already fixed in the latest release:

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5.0.3 - Fix for running against 2.6.34 and later kernels to recognize [...]

I saw your update - thanks, Andreas -- Andreas Jaeger, Program Manager openSUSE, aj@{novell.com,opensuse.org} Twitter: jaegerandi | Identica: jaegerandi SUSE LINUX Products GmbH, GF: Markus Rex, HRB 16746 (AG Nürnberg) Maxfeldstr. 5, 90409 Nürnberg, Germany GPG fingerprint = 93A3 365E CE47 B889 DF7F FED1 389A 563C C272 A126