Re: [Crash-utility] crash warnings
Badari Pulavarty wrote:
On Thu, 2006-04-27 at 12:21 -0400, Dave Anderson wrote:
> Badari,
>
> What happens when you disassemble sys_read() on a live
> system running that particular kernel? Use "dis sys_read" as the
> crash command.
>
> Thanks,
> Dave
Dave,
crash shows wrong dis-assembly for even live machine...
Thanks,
Badari
elm3a242:~/crash-4.0-2.23 # ./crash /usr/src/linux/vmlinux
crash 4.0-2.23
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Copyright (C) 2005 Fujitsu Limited
Copyright (C) 2005 NEC Corporation
Copyright (C) 1999, 2002 Silicon Graphics, Inc.
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This GDB was configured as "x86_64-unknown-linux-gnu"...
SYSTEM MAP: /usr/src/linux/System.map
DEBUG KERNEL: /usr/src/linux/vmlinux (2.6.16-20-smp)
Strange -- why is it even using /usr/src/linux/System.map?
You didn't enter it on the boot command line, and so I believe
the only way that it would possibly be set would be by the
find_booted_system_map() function -- which only would be
called by match_proc_version() when the vmlinux file doesn't
match the live system.
What happens when you do this:
$ strings /usr/src/linux/vmlinux | grep "Linux ver"
$ cat /proc/version
Are the outputs identical?
Dave
DUMPFILE: /dev/mem
CPUS: 2
DATE: Thu Apr 27 02:06:52 2006
UPTIME: 16:29:16
LOAD AVERAGE: 0.07, 0.02, 0.00
TASKS: 64
NODENAME: elm3a242
RELEASE: 2.6.16-20-smp
VERSION: #1 SMP Mon Apr 10 04:51:13 UTC 2006
MACHINE: x86_64 (3000 Mhz)
MEMORY: 4.6 GB
PID: 12798
COMMAND: "crash"
TASK: ffff8101235e37d0 [THREAD_INFO: ffff810118742000]
CPU: 0
STATE: TASK_RUNNING (ACTIVE)
crash> dis sys_read
0xffffffff8017b991 <sys_read>: add %cl,0xffffffffffffff83(%rax)
0xffffffff8017b994 <sys_read+3>: (bad)
0xffffffff8017b995 <sys_read+4>: sbb %cl,0xffffffffffffff89(%
rax)
0xffffffff8017b998 <sys_read+7>: callq 0xffffffffdc5916f8
0xffffffff8017b99d <sys_read+12>: pop %r13
0xffffffff8017b99f <sys_read+14>: retq
0xffffffff8017b9a0 <sys_read+15>:
mov 1862306(%rip),%eax # 0xffffffff80342448 <files_stat+8>
0xffffffff8017b9a6 <sys_read+21>: retq
0xffffffff8017b9a7 <sys_read+22>: push %rbx
0xffffffff8017b9a8 <sys_read+23>: cmp %rdi,(%rdi)
0xffffffff8017b9ab <sys_read+26>: mov %rdi,%rbx
0xffffffff8017b9ae <sys_read+29>: je 0xffffffff8017b9db
<sys_read+74>
0xffffffff8017b9b0 <sys_read+31>: mov $0xffffffff80456b80,%rdi
0xffffffff8017b9b7 <sys_read+38>:
callq 0xffffffff802d0aad <__down_interruptible+75>
0xffffffff8017b9bc <sys_read+43>: mov (%rbx),%rdx
0xffffffff8017b9bf <sys_read+46>: mov 0x8(%rbx),%rax
0xffffffff8017b9c3 <sys_read+50>: mov %rax,0x8(%rdx)
0xffffffff8017b9c7 <sys_read+54>: mov %rdx,(%rax)
0xffffffff8017b9ca <sys_read+57>: mov %rbx,0x8(%rbx)
0xffffffff8017b9ce <sys_read+61>: mov %rbx,(%rbx)
0xffffffff8017b9d1 <sys_read+64>:
--
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