Re: [Crash-utility] crash-6.0.2 won't do module source lines on our kernel
----- Original Message -----
----- Original Message -----
> I've reverted back to crash-5.1.9 and applied my kmem patch to that for
> our use here. We're using a 3.1-based kernel, and need the kmem patch
> so crash can deal with the change in CONFIG_SLAB, but we're building
> with gcc-4.4.5 and don't really need the new gdb in crash-6.0.2, and
> crash-6.0.2 is not giving module source line numbers for us with "dis
-l".
>
> This is just a heads up. I don't know why 6.0.2 is failing this, and
> since I found the last module source line number problem, it's not my
> turn ;-)
>
> Bob Montgomery
What kernel version? I'll try to reproduce it.
BTW, you might try this patch to symbols.c:
https://www.redhat.com/archives/crash-utility/2011-December/msg00043.html
> I could not found out corresponding condition from gdb-7.3.1/
> but maybe -readnow is simple and proper way for this problem.
> I've tested and got the good result.
>
> // sprintf(buf, "add-symbol-file %s 0x%lx",
> sprintf(buf, "add-symbol-file %s 0x%lx
> -readnow",
> lm->mod_namelist, section_vaddr);
Although I still don't know why the module line-number fixes that went
into crash-6.0.1 wouldn't accomplish the same thing without the overhead
of doing it for all symbols of all modules.
Dave
So I tried to reproduce it -- at least with this 3.1-based kernel built
with gcc 4.6.2:
crash> help -k | grep proc_version
proc_version: Linux version 3.1.7-1.fc16.x86_64
(mockbuild(a)x86-18.phx2.fedoraproject.org) (gcc version 4.6.2 20111027 (Red Hat 4.6.2-1)
(GCC) ) #1 SMP Tue Jan 3 19:45:05 UTC 2012
crash>
but module line numbers come out OK:
crash> mod -s bnx2 bnx2.ko.debug
MODULE NAME SIZE OBJECT FILE
ffffffffa00c69c0 bnx2 75492 bnx2.ko.debug
crash> dis -l bnx2_open
/usr/src/debug/kernel-3.1.fc16/linux-3.1.x86_64/drivers/net/bnx2.c: 6265
0xffffffffa00c0e80 <bnx2_open>: push %rbp
0xffffffffa00c0e81 <bnx2_open+1>: mov %rsp,%rbp
0xffffffffa00c0e84 <bnx2_open+4>: push %r15
0xffffffffa00c0e86 <bnx2_open+6>: push %r14
0xffffffffa00c0e88 <bnx2_open+8>: push %r13
0xffffffffa00c0e8a <bnx2_open+10>: push %r12
0xffffffffa00c0e8c <bnx2_open+12>: push %rbx
0xffffffffa00c0e8d <bnx2_open+13>: sub $0x8,%rsp
0xffffffffa00c0e91 <bnx2_open+17>: data32 data32 data32 xchg %ax,%ax
/usr/src/debug/kernel-3.1.fc16/linux-3.1.x86_64/drivers/net/bnx2.c: 6266
0xffffffffa00c0e96 <bnx2_open+22>: lea 0x740(%rdi),%r12
/usr/src/debug/kernel-3.1.fc16/linux-3.1.x86_64/drivers/net/bnx2.c: 6265
0xffffffffa00c0e9d <bnx2_open+29>: mov %rdi,%rbx
...
Dave