System information

216 System Analysis and Tuning Guide
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KERNEL: /boot/vmlinux-2.6.32.8-0.1-default.gz
DEBUGINFO: /usr/lib/debug/boot/vmlinux-2.6.32.8-0.1-default.debug
DUMPFILE: /var/crash/2009-04-23-11:17/vmcore
CPUS: 2
DATE: Thu Apr 23 13:17:01 2010
UPTIME: 00:10:41
LOAD AVERAGE: 0.01, 0.09, 0.09
TASKS: 42
NODENAME: eros
RELEASE: 2.6.32.8-0.1-default
VERSION: #1 SMP 2010-03-31 14:50:44 +0200
MACHINE: x86_64 (2999 Mhz)
MEMORY: 1 GB
PANIC: "SysRq : Trigger a crashdump"
PID: 9446
COMMAND: "bash"
TASK: ffff88003a57c3c0 [THREAD_INFO: ffff880037168000]
CPU: 1
STATE: TASK_RUNNING (SYSRQ)
crash>
The command output prints first useful data: There were 42 tasks running at the mo-
ment of the kernel crash. The cause of the crash was a SysRq trigger invoked by the
task with PID 9446. It was a Bash process because the echo that has been used is an
internal command of the Bash shell.
The crash utility builds upon GDB and provides many useful additional commands. If
you enter bt without any parameters, the backtrace of the task running at the moment
of the crash is printed:
crash> bt
PID: 9446 TASK: ffff88003a57c3c0 CPU: 1 COMMAND: "bash"
#0 [ffff880037169db0] crash_kexec at ffffffff80268fd6
#1 [ffff880037169e80] __handle_sysrq at ffffffff803d50ed
#2 [ffff880037169ec0] write_sysrq_trigger at ffffffff802f6fc5
#3 [ffff880037169ed0] proc_reg_write at ffffffff802f068b
#4 [ffff880037169f10] vfs_write at ffffffff802b1aba
#5 [ffff880037169f40] sys_write at ffffffff802b1c1f
#6 [ffff880037169f80] system_call_fastpath at ffffffff8020bfbb