* kstopmachine thread panic in do_exit (2.6.9-rc1-bk1)
@ 2004-08-26 17:11 Nathan Lynch
2004-08-27 1:39 ` Rusty Russell
0 siblings, 1 reply; 2+ messages in thread
From: Nathan Lynch @ 2004-08-26 17:11 UTC (permalink / raw)
To: Linus Torvalds; +Cc: lkml, Ingo Molnar, Rusty Russell
Hi-
Something crept in between 2.6.9-rc1 and 2.6.9-rc1-bk1 which reliably
trips the "Aiee, killing interrupt handler!" panic in do_exit when
offlining a cpu. I inserted a BUG() before the panic call to see what's
causing it, looks like one of the kstopmachine threads spawned by
stop_machine. I can't do a comparison with current -mm because
offlining a cpu doesn't even get that far there.
Backing out the most recent sched.c change ("sched: smt fixes" as of
this writing) fixes it. Turning off preempt seems to work around it.
The bug is still present in -bk2. I'm seeing this on a 4-way ppc64
machine.
Nathan
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: kstopmachine thread panic in do_exit (2.6.9-rc1-bk1)
2004-08-26 17:11 kstopmachine thread panic in do_exit (2.6.9-rc1-bk1) Nathan Lynch
@ 2004-08-27 1:39 ` Rusty Russell
0 siblings, 0 replies; 2+ messages in thread
From: Rusty Russell @ 2004-08-27 1:39 UTC (permalink / raw)
To: Nathan Lynch
Cc: Linus Torvalds, lkml - Kernel Mailing List, Ingo Molnar,
Andrew Morton
On Fri, 2004-08-27 at 03:11, Nathan Lynch wrote:
> Hi-
>
> Something crept in between 2.6.9-rc1 and 2.6.9-rc1-bk1 which reliably
> trips the "Aiee, killing interrupt handler!" panic in do_exit when
> offlining a cpu.
Yes, this is fixed in the -mm tree by the two patches I posted
yesterday. Those versions depend on nicksched, so Andrew dropped them.
I'll make new ones and send shortly.
Rusty.
--
Anyone who quotes me in their signature is an idiot -- Rusty Russell
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