From: Flavio Leitner <fbl@redhat.com>
To: lkml <linux-kernel@vger.kernel.org>
Cc: Ingo Molnar <mingo@elte.hu>, WANG Cong <xiyou.wangcong@gmail.com>,
Yinghai Lu <yinghai@kernel.org>, Tejun Heo <tj@kernel.org>,
<ianfang.cn@gmail.com>, Andrew Morton <akpm@linux-foundation.org>
Subject: kexec/kdump kernel fails to start
Date: Tue, 4 Sep 2012 14:32:15 -0300 [thread overview]
Message-ID: <20120904143215.5bbbb2a4@obelix.rh> (raw)
[-- Attachment #1: Type: text/plain, Size: 2397 bytes --]
Hi folks,
I have system that no longer boots kdump kernel. Basically,
# echo c > /proc/sysrq-trigger
to dump a vmcore doesn't work. It just hangs after showing the usual
panic messages. I've bisected the problem and the commit introducing
the issue is the one below.
Any idea?
commit 722bc6b16771ed80871e1fd81c86d3627dda2ac8
Author: WANG Cong <xiyou.wangcong@gmail.com> 2012-03-05 20:05:13
Committer: Ingo Molnar <mingo@elte.hu> 2012-03-06 05:38:26
Parent: 550cf00dbc8ee402bef71628cb71246493dd4500 (Merge tag 'mmc-fixes-for-3.3' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc)
Child: a6fca40f1d7f3e232c9de27c1cebbb9f787fbc4f (x86, tlb: Switch cr3 in leave_mm() only when needed)
Branches: master, remotes/origin/master
Follows: v3.3-rc6
Precedes: v3.5-rc1
x86/mm: Fix the size calculation of mapping tables
For machines that enable PSE, the first 2/4M memory region still uses
4K pages, so needs more PTEs in this case, but
find_early_table_space() doesn't count this.
This patch fixes it.
The bug was found via code review, no misbehavior of the kernel
was observed.
Machine details:
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 26
model name : Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz
stepping : 5
microcode : 0x11
cpu MHz : 1596.000
cache size : 8192 KB
physical id : 0
siblings : 8
core id : 0
cpu cores : 4
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt lahf_lm ida dts tpr_shadow vnmi flexpriority ept vpid
bogomips : 5333.87
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:
# free
total used free shared buffers cached
Mem: 16161684 11749100 4412584 0 10212 11421096
-/+ buffers/cache: 317792 15843892
Swap: 17406420 0 17406420
dmesg is attached.
thanks,
fbl
[-- Attachment #2: dmesg.log.gz --]
[-- Type: application/x-gzip, Size: 18917 bytes --]
next reply other threads:[~2012-09-04 17:32 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-04 17:32 Flavio Leitner [this message]
2012-09-04 19:02 ` kexec/kdump kernel fails to start Yinghai Lu
2012-09-04 19:17 ` Flavio Leitner
2012-09-04 19:20 ` Yinghai Lu
2012-09-04 20:00 ` Flavio Leitner
2012-09-04 20:26 ` Flavio Leitner
2012-09-04 20:45 ` Yinghai Lu
2012-09-04 21:37 ` Flavio Leitner
2012-09-04 22:25 ` Yinghai Lu
2012-09-04 22:40 ` Flavio Leitner
2012-09-05 0:01 ` Flavio Leitner
2012-09-05 1:15 ` Yinghai Lu
2012-09-05 13:46 ` Flavio Leitner
2012-09-05 15:34 ` Cong Wang
2012-09-23 20:27 ` Dan Carpenter
2012-09-23 20:52 ` Yinghai Lu
2012-09-29 7:13 ` Ingo Molnar
2012-10-18 2:16 ` Dave Young
2012-10-18 6:33 ` Dave Young
2012-10-18 13:57 ` Cong Wang
2012-10-18 16:27 ` Flavio Leitner
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20120904143215.5bbbb2a4@obelix.rh \
--to=fbl@redhat.com \
--cc=akpm@linux-foundation.org \
--cc=ianfang.cn@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=tj@kernel.org \
--cc=xiyou.wangcong@gmail.com \
--cc=yinghai@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).