Messages in this thread | | | Date | Sun, 23 Sep 2007 13:53:03 +0800 | From | Fengguang Wu <> | Subject | Re: [BUG 2.6.23-rc6-mm1] NMI Watchdog detected LOCKUP on CPU 0 |
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On Sat, Sep 22, 2007 at 10:35:45PM -0700, Andrew Morton wrote: > 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.
Let's forget it for now. I can try Ingo's latency tracing patches at some convenient time.
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