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re: port-sparc/45255: GCC 4.5.3 and sparc re-triggers the NULL savefpstate IPI issue
The following reply was made to PR port-sparc/45255; it has been noted by GNATS.
From: Hauke Fath <hauke%Espresso.Rhein-Neckar.DE@localhost>
Subject: re: port-sparc/45255: GCC 4.5.3 and sparc re-triggers the NULL
savefpstate IPI issue
Date: Wed, 17 Aug 2011 09:36:20 +0200
At 18:10 Uhr +0000 15.8.2011, matthew green wrote:
> > ...interesting. I have seen these NULL savefpstate panics on my ss20 (2x
> > SM71) ever since I upgraded to HEAD. Just last weekend, I switched to a UP
> > kernel to at least be able to build a few packages. Should have sent-pr
> > earlier, I guess.
> hmmm, i haven't seen those panics for several months, not since i
> made this change:
> revision 1.225
> date: 2011/01/22 12:13:25; author: mrg; state: Exp; lines: +3 -3
> convert xpmsg_lock to IPL_SCHED. the old spl/simple_lock code ran at
> splsched(), and this significantly helps with stability under load
> when running with multiple active CPUs.
I've seen several reboots every day, and the machine wouldn't stay up long
enough to build a non-trivial package, or make it through the nightly
Amanda backup run.
Since your change, I haven't seen a single kernel panic.
> > Are you positive this is an exclusively gcc 4.5 related issue?
> not any more. when it fails for you, can you get the backtraces
> of both CPUs and post them? thanks.
I'll look into that next week.
"It's never straight up and down" (DEVO)
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