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Date: Tue, 17 Apr 2007 18:01:42 +0200 From: Ingo Molnar <mingo@...e.hu> To: S.Çağlar Onur <caglar@...dus.org.tr> Cc: linux-kernel@...r.kernel.org, Linus Torvalds <torvalds@...ux-foundation.org>, Andrew Morton <akpm@...ux-foundation.org>, Con Kolivas <kernel@...ivas.org>, Nick Piggin <npiggin@...e.de>, Mike Galbraith <efault@....de>, Arjan van de Ven <arjan@...radead.org>, Peter Williams <pwil3058@...pond.net.au>, Thomas Gleixner <tglx@...utronix.de>, Willy Tarreau <w@....eu>, Gene Heskett <gene.heskett@...il.com>, Dmitry Adamushko <dmitry.adamushko@...il.com>, Christophe Thommeret <hftom@...e.fr>, Christoph Pfister <christophpfister@...il.com>, Jurgen Kofler <kaffeine@....net> Subject: Re: [patch] CFS (Completely Fair Scheduler), v2 * S.Çağlar Onur <caglar@...dus.org.tr> wrote: > If you want me to test something else just ask please :) yes, it would be nice to do a: strace -o kaffine.log -f -tttTTT kaffeine log. Because in your old log this is visible: clone(child_stack=0xb02394a4, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0xb0239bd8, {entry_number:6, base_addr:0xb0239b90, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}, child_tidptr=0xb0239bd8) = 11340 futex(0x89ac218, FUTEX_WAKE, 1) = 1 we cloned a task and immediately afterwards we used futex 0x89ac218. After that point many things happen, but the lockup itself: futex(0x89ac218, FUTEX_WAIT, 2, NULL) = 0 futex(0x89ac218, FUTEX_WAIT, 2, NULL) = 0 futex(0x89ac218, FUTEX_WAIT, 2, NULL) = 0 is the same futex. Probably related to the same child thread? It would be nice to also get a gdb backtrace: gdb kaffine <reproduce the hang> Ctrl-C bt this should give you a gdb backtrace of that kaffeine hang. Thanks, Ingo - 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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