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-------- Original message --------
From: wuzhouhui <wuzhouhui14@mails.ucas.ac.cn>
Date: 12/29/17 2:34 AM (GMT-05:00)
To: crash-utility@redhat.com
Subject: [Crash-utility] Fw: [CentOS] Can't see register value in crash
vmcore
发件人: wuzhouhui <wuzhouhui14@mails.ucas.ac.cn>
发送时间: 2017-12-28 10:10:57 (星期四)
收件人: centos@centos.org
抄送:
主题: [CentOS] Can't see register value in crash vmcore
OS: CentOS 6.5
Crash: crash-7.1.0-6.el6.x86_64
Kdump: kexec-tools-2.0.0-273.el6.x86_64
GDB: gdb-7.2-60.el6_4.1.x86_64
/etc/kdump.conf: core_collector makedumpfile -c --message-level 1 -d 31
Kernel crashed by panic("string"), but I can't see any register in vmcore:
crash> bt
PID: 53331 TASK: ffff880c523ed540 CPU: 2 COMMAND: "bw_sd-ar-7-0_2"
#0 [ffff880c4f12f978] machine_kexec at ffffffff81038ed9
#1 [ffff880c4f12f9d8] crash_kexec at ffffffff810c5a82
#2 [ffff880c4f12faa8] panic at ffffffff815113b2
#3 [ffff880c4f12fb28] sd_submit_bio at ffffffffa0747a02 [sd]
#4 [ffff880c4f12fb68] submit_clone_bio at ffffffffa0747d2b [sd]
#5 [ffff880c4f12fb78] split_and_submit_bio_for_cbd at ffffffffa0747ec9 [sd]
#6 [ffff880c4f12fbf8] sd_make_request at ffffffffa074c812 [sd]
#7 [ffff880c4f12fc68] sdu_make_request at ffffffffa074ca41 [sd]
#8 [ffff880c4f12fc88] generic_make_request at ffffffff81264d70
#9 [ffff880c4f12fd68] submit_bio at ffffffff81265140
#10 [ffff880c4f12fdb8] submit_area_bio at ffffffffa04ade20 [scst_vdisk]
#11 [ffff880c4f12fde8] bwraid_submit_bio at ffffffffa04b03b2 [scst_vdisk]
#12 [ffff880c4f12fe38] worker_thread at ffffffff81094c50
#13 [ffff880c4f12fee8] kthread at ffffffff8109ae26
#14 [ffff880c4f12ff48] kernel_thread at ffffffff8100c20a
crash>
Is it normal?
Thanks.
___________
Yes. A register dump will be displayed if an exception occurred. In the case above, sd_submit_bio() made a direct call to panic(), and so there is no exception register dump. You can use "bt -f", "bt -F" or "bt -FF" to see the stack contents, which may help.
Dave
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