linux-kernel - Re: [2.6.36-rc5 backtrace] NMI watchdog detects rcu_sched

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Date:	Thu, 23 Sep 2010 12:39:21 +0300
From:	Plamen Petrov <pvp-lsts@...uni-ruse.bg>
To:	Don Zickus <dzickus@...hat.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: [2.6.36-rc5 backtrace] NMI watchdog detects rcu_sched_state stall

Hello again, Don!

Here is what I've got this time, and now it is dmesg + kernel .config:

> [  413.009603] XFS mounting filesystem md1
> [  413.159227] Ending clean XFS mount for filesystem: md1
> [ 3786.389501] IN=eth0 OUT= MAC=00:0e:2e:5c:27:ef:00:0e:2e:5c:27:b2:08:00 SRC=112.90.146.2 DST=192.168.1.2 LEN=48 TOS=0x00 PREC=0x00 TTL=115 ID=14727 PROTO=TCP SPT=40708 DPT=22 WINDOW=65535 RES=0x00 SYN URGP=0
> [ 3789.079725] IN=eth0 OUT= MAC=00:0e:2e:5c:27:ef:00:0e:2e:5c:27:b2:08:00 SRC=112.90.146.2 DST=192.168.1.2 LEN=48 TOS=0x00 PREC=0x00 TTL=115 ID=1948 PROTO=TCP SPT=1116 DPT=22 WINDOW=65535 RES=0x00 SYN URGP=0
> [ 3791.679944] IN=eth0 OUT= MAC=00:0e:2e:5c:27:ef:00:0e:2e:5c:27:b2:08:00 SRC=112.90.146.2 DST=192.168.1.2 LEN=48 TOS=0x00 PREC=0x00 TTL=115 ID=4706 PROTO=TCP SPT=1117 DPT=22 WINDOW=65535 RES=0x00 SYN URGP=0
> [ 3794.280165] IN=eth0 OUT= MAC=00:0e:2e:5c:27:ef:00:0e:2e:5c:27:b2:08:00 SRC=112.90.146.2 DST=192.168.1.2 LEN=48 TOS=0x00 PREC=0x00 TTL=115 ID=18833 PROTO=TCP SPT=1118 DPT=22 WINDOW=65535 RES=0x00 SYN URGP=0
> [ 3796.880371] IN=eth0 OUT= MAC=00:0e
> [ 3797.260001] INFO: rcu_sched_state detected stall on CPU 0 (t=1000 jiffies)
> [ 3797.260001] sending NMI to all CPUs:
> [ 3807.480225] :2e:5c:27:ef:00:0e:2e:5c:27:b2:08:00 SRC=112.90.146.2 DST=192.168.1.2 LEN=48 TOS=0x00 PREC=0x00 TTL=115 ID=2624 PROTO=TCP SPT=1119 DPT=22 WINDOW=65535 RES=0x00 SYN URGP=0

For the record, I have setup the machine to log and drop all attempts to
connect to the world exposed port 22, and as you can see, we've got a
rcu_sched_state stall during such a print...

Plamen

View attachment "dmesg-2010-09-23-Plamen" of type "text/plain" (53669 bytes)

View attachment "config-v2.6.36-rc5-49-gc79bd89-FS" of type "text/plain" (53547 bytes)