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Date: Mon, 25 Aug 2008 10:48:21 +1000 From: Benjamin Herrenschmidt <benh@...nel.crashing.org> To: "Rafael J. Wysocki" <rjw@...k.pl> Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Adrian Bunk <bunk@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Natalie Protasevich <protasnb@...il.com>, Kernel Testers List <kernel-testers@...r.kernel.org> Subject: Re: 2.6.27-rc4-git1: Reported regressions from 2.6.26 > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=11414 > Subject : Random crashes with 2.6.27-rc3 on PPC > Submitter : Michael Buesch <mb@...sch.de> > Date : 2008-08-23 14:10 (1 days old) > References : http://marc.info/?l=linux-kernel&m=121950076812616&w=4 This appears to be a gcc bug when -fno-omit-stack-pointer is used (which we mostly don't need on ppc anyway except that another gcc stupidity makes it mandatory for -pg which ftrace needs). We're working on a two fold workaround: removing -fno-omit-stack-pointer in all the cases where we don't really need it, and for when we do (ie, CONFIG_FTRACE becaues of -pg), using -mno-sched-epilog which seems to work around it. The root cause in gcc hasn't been fully identified yet. Ben. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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