Arthur Marsh wrote, on 30/04/11 07:06:
Hi, I'd previously (2011-03-28) run into an issue with commit
f99a99330f85a84c346ddeb4adc72dbfad9b9e3e
kernel/watchdog.c: always return NOTIFY_OK during cpu up/down events
but wasn't sure that this commit was the cause of a problem or simply
revealing symptoms. I have since re-run a git-bisect and the same commit
was implicated.
On on old Pentium-II-266 machine with 440BX chipset I would get numerous
"BUG: soft lockup - CPU#0 stuck for 63s!" type errors in dmesg with
different applications being reported and even a command like:
dmesg|tail -100
executed in a konsole window would cause the machine to be unresponsive
for a few minutes. System shutdown would also fail, requiring "init 0"
to be entered a second time.
This behaviour happened both with and without "lapic" on the kernel
command line, and with a kernel from Debian Experimental as documented
at: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=624129
As this bisection took a couple of days I haven't tested the last few
snapshots at kernel.org but will do so later today.
I'm happy to test any new versions of patches to work around this issue.
Arthur.
Even with kernel 2.6.39-rc5-git2 I'm seeing:
$ dmesg|grep -i cpu
[ 323.983198] BUG: soft lockup - CPU#0 stuck for 63s! [egrep:3599]
[ 323.983198] EIP: 0073:[<08051305>] EFLAGS: 00000212 CPU: 0
[ 467.206148] BUG: soft lockup - CPU#0 stuck for 61s! [kded:2679]
[ 467.206148] EIP: 0073:[<41fdbb1c>] EFLAGS: 00000246 CPU: 0
[ 651.351146] BUG: soft lockup - CPU#0 stuck for 63s! [Xorg:1566]
[ 651.351146] EIP: 0073:[<081a1ae5>] EFLAGS: 00003246 CPU: 0
[ 777.521288] BUG: soft lockup - CPU#0 stuck for 61s! [icedove-bin:3534]
[ 777.521288] EIP: 0073:[<b75fee57>] EFLAGS: 00200283 CPU: 0
[ 893.462901] BUG: soft lockup - CPU#0 stuck for 64s! [aptitude:3856]
[ 893.462901] EIP: 0073:[<4107b35d>] EFLAGS: 00200202 CPU: 0
but at least with 2.6.39-rc5-git2, I'm not seeing a lock-up happening
when entering a command like:
dmesg|tail -100
in a konsole window.
Arthur.
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