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authorPekka Enberg <penberg@cs.helsinki.fi>2007-06-01 00:46:50 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-06-01 08:18:28 -0700
commit926b28984da035ac407e6b8f22ee8b4f94f51cf1 (patch)
tree81bd3124062c614d17650667b4401425365d8237 /Documentation/BUG-HUNTING
parent0a920b5b666d0be8141bd1ce620fffa7de96b81b (diff)
downloadkernel-926b28984da035ac407e6b8f22ee8b4f94f51cf1.tar.gz
Documentation: How to use GDB to decode OOPSes
Adds instructions how to use GDB to figure out the exact location of an OOPS to Documentation/BUG-HUNTING. Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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diff --git a/Documentation/BUG-HUNTING b/Documentation/BUG-HUNTING
index 65b97e1dbf70..35f5bd243336 100644
--- a/Documentation/BUG-HUNTING
+++ b/Documentation/BUG-HUNTING
@@ -191,6 +191,30 @@ e.g. crash dump output as shown by Dave Miller.
> mov 0x8(%ebp), %ebx ! %ebx = skb->sk
> mov 0x13c(%ebx), %eax ! %eax = inet_sk(sk)->opt
+In addition, you can use GDB to figure out the exact file and line
+number of the OOPS from the vmlinux file. If you have
+CONFIG_DEBUG_INFO enabled, you can simply copy the EIP value from the
+OOPS:
+
+ EIP: 0060:[<c021e50e>] Not tainted VLI
+
+And use GDB to translate that to human-readable form:
+
+ gdb vmlinux
+ (gdb) l *0xc021e50e
+
+If you don't have CONFIG_DEBUG_INFO enabled, you use the function
+offset from the OOPS:
+
+ EIP is at vt_ioctl+0xda8/0x1482
+
+And recompile the kernel with CONFIG_DEBUG_INFO enabled:
+
+ make vmlinux
+ gdb vmlinux
+ (gdb) p vt_ioctl
+ (gdb) l *(0x<address of vt_ioctl> + 0xda8)
+
Another very useful option of the Kernel Hacking section in menuconfig is
Debug memory allocations. This will help you see whether data has been
initialised and not set before use etc. To see the values that get assigned