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.wangc...@gmail.com> 2012-03-05 20:05:13
Committer: Ingo Molnar <mi...@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
dmesg.log.gz
Description: GNU Zip compressed data
