| Date | Sat, 22 Sep 2007 22:35:45 -0700 | From | Andrew Morton <> | Subject | Re: [BUG 2.6.23-rc6-mm1] NMI Watchdog detected LOCKUP on CPU 0 |
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On Sun, 23 Sep 2007 13:30:40 +0800 Fengguang Wu <wfg@mail.ustc.edu.cn> wrote:
> > That's interensting. serial_in(). We have had NMI watchdog expiries when > > the kernel is printing a large amount of stuff out a slow serial port with > > interrutps disabled. But I thought we'd pretty much plugged those problems > > by sprinkling touch_nmi_watchdog() in various places. > > > > Do you think this is what was happening on your system? > > Very likely. I'm running linux with cmdline > "root=/dev/sda1 ro nmi_watchdog=1 console=ttyS0,115200 console=tty0", > and doing a lot of printks at the time ;-)
OK. We need to find a suitable place to poke yet another touch_nmi_watchdog(). Maybe we should give up and put one in printk().
And you oopsed for different reasons in the nmi-watchdog handling code too. I think I'll pretend I didn't see that.
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