Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote: > > Well, not sure. Most likely candidate is the new block timer code. > > What seems to be happening is that the queue is being released with > > either an outstanding request (refcounting problem) or ticking timer > > with no work (block timer problem). The way scanning works is that we > > create a request queue for each device we probe and then delete it again > > if nothing appears after the bus settle time. The argument against > > this is that it should show up on every scanned bus. However, these are > > getting rarer; I was just about to write that I hadn't seen it when I > > remembered that all my SCSI testing systems are currently running > > hotplug reporting busses (i.e. don't do scanning). However, > > fortunately, I've also booted voyager recently which does use parallel > > SCSI and doesn't see this either, so it could also be megaraid_sas > > specific. > > 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. -andmike -- Michael Anderson andmike@xxxxxxxxxxxxxxxxxx blk: blk_add_timer debug patch [DEBUG] Debug only patch. Debug patch to blk_add_timer to not start timer for request that do not have the REQ_STARTED flag set. Signed-off-by: Mike Anderson <andmike@xxxxxxxxxxxxxxxxxx> --- block/blk-timeout.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-) diff --git a/block/blk-timeout.c b/block/blk-timeout.c index 69185ea..4389391 100644 --- a/block/blk-timeout.c +++ b/block/blk-timeout.c @@ -177,6 +177,9 @@ void blk_add_timer(struct request *req) BUG_ON(!list_empty(&req->timeout_list)); BUG_ON(test_bit(REQ_ATOM_COMPLETE, &req->atomic_flags)); + if (!(req->cmd_flags & REQ_STARTED)) + return; + if (req->timeout) req->deadline = jiffies + req->timeout; else { -- 1.5.6.5 -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
