Re: kdump regression compared to v2.6.35 - caiqian-H+wXaHxf7aLQT0dZR+AlfA

From: caiqian-H+wXaHxf7aLQT0dZR+AlfA@public•gmane.org
To: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public•gmane.org>
Cc: kexec <kexec-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public•gmane.org>,
	linux-next-u79uwXL29TY76Z2rM5mHXA@public•gmane.org,
	torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public•gmane.org,
	linux-kernel
	<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public•gmane.org>
Subject: Re: kdump regression compared to v2.6.35
Date: Sun, 29 Aug 2010 07:41:33 -0400 (EDT)	[thread overview]
Message-ID: <171172387.1479581283082093912.JavaMail.root@zmail06.collab.prod.int.phx2.redhat.com> (raw)
In-Reply-To: <123671462.1479561283081998014.JavaMail.root-k5qu2F3t005+R5eDjrG6zsCp5Q1pQRjfhaY/URYTgi6ny3qCrzbmXA@public.gmane.org>


----- "Tejun Heo" <tj-DgEjT+Ai2ygdnm+yROfE0A@public•gmane.org> wrote:

> Hello,
> 
> On 08/29/2010 01:24 PM, CAI Qian wrote:
> >> On 08/29/2010 09:01 AM, caiqian-H+wXaHxf7aLQT0dZR+AlfA@public•gmane.org wrote:
> >>> Further bisect indicated this bad commit from the merge. Given kdump
> >>> kernel was running with maxcpus=1, I guess this work caused
> fs/bio.c
> >>> hung in the workqueue on UP. Reverted the whole merge let kdump
> work
> >>> again.
> >>
> >> Can you please pull from the following git tree and see whether it
> >> fixes the problem?  There was a bug in nr_active accounting.
> >
> > It had the same problem.
> 
> I see.  Hmm... a different issue then.  Can you please tell me how to
> reproduce the problem?
First, to configure kdump - see Documentation/kdump/kdump.txt. It might be easier if you are using a distro that provide advanced kdump tools. Then, to trigger the kdump - echo c >/proc/sysrq-trigger. In case needed, here is the system information,
# lscpu
Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
CPU(s):                64
Thread(s) per core:    2
Core(s) per socket:    8
CPU socket(s):         4
NUMA node(s):          4
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 46
Stepping:              6
CPU MHz:               1064.000
Virtualization:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              18432K
NUMA node0 CPU(s):     0,4,8,12,16,20,24,28,32,36,40,44,48,52,56,60
NUMA node1 CPU(s):     1,5,9,13,17,21,25,29,33,37,41,45,49,53,57,61
NUMA node2 CPU(s):     2,6,10,14,18,22,26,30,34,38,42,46,50,54,58,62
NUMA node3 CPU(s):     3,7,11,15,19,23,27,31,35,39,43,47,51,55,59,63

> Thanks.
> 
> -- 
> tejun
> 
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