On Mon, 24 Nov 2008 16:09:02 -0800 malahal@xxxxxxxxxx wrote: > > Thomas Gleixner [tglx@xxxxxxxxxxxxx] wrote: > > On Mon, 24 Nov 2008, Mike Anderson wrote: > > > Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote: > > > > Yeah, block could it be as well. Jens, Mike ? > > > > > > I added a comment to bug 12020 on Thursday about a few other systems that > > > where seeing the signature shown in bug 12020. It appeared from debug that > > > there where a few paths that where adding timers for requests that where > > > not expected. > > > > > > http://bugzilla.kernel.org/show_bug.cgi?id=12020 > > > > > > It would be good to know if the debug patch below effects your problem as while. > > > > > > If it does we need to investigated a solution to resolve not adding a > > > timer for these requests. > > The block timer code calls del_timer(), should it call del_timer_sync()? > It is possible although unlikely that you are hitting del_timer_sync vs > del_timer problem in the block timeout code. Can only be seen on SMP > systems though! Is this still a problem in next-20081121? In that tree, the block commit "block: leave the request timeout timer running even on an empty list" was changed to add this: diff --git a/block/blk-core.c b/block/blk-core.c index 04267d6..44f547c 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -391,6 +391,7 @@ EXPORT_SYMBOL(blk_stop_queue); void blk_sync_queue(struct request_queue *q) { del_timer_sync(&q->unplug_timer); + del_timer_sync(&q->timeout); kblockd_flush_work(&q->unplug_work); } EXPORT_SYMBOL(blk_sync_queue); After I spent some time bisecting a boot failure in PowerPC. -- Cheers, Stephen Rothwell sfr@xxxxxxxxxxxxxxxx http://www.canb.auug.org.au/~sfr/
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