On Thu, Oct 30 2008, Mike Anderson wrote:
> Jens Axboe <jens.axboe@xxxxxxxxxx> wrote:
> > On Thu, Oct 30 2008, Tejun Heo wrote:
> > > Jens Axboe wrote:
> > > > That's actually a pretty dumb error, I'm surprised it hasn't reared its
> > > > ugly face in more ways. Presumably because the timeout is usually so
> > > > long, that we'll get to actually issuing and completing it within the
> > > > normal timeout anyway.
> > >
> > > Heh... it showed its ugly face in many different ways while I was
> > > playing with PMP connected via a very long eSATA cable.
> >
> > Ah :-)
> >
> > If we had it wired up for eg the old IDE drivers, it would have shown up
> > quite quickly as well I think.
>
> I am getting errors now and my system will not boot up. The system is
> connected to storage with active / passive paths. If we are doing a
> BLKPREP_KILL we will call elv_dequeue_request which will add the
> timer for the request we are killing.
>
> The attached patch is a quick patch to work around my issue, but we
> probably need something better. I would like to run some short timeout
> testing on it for a while (though that previously did not catch Tejun's
> issue). I will look at this more tomorrow unless someone beats me to it.
>
> -andmike
> --
> Michael Anderson
> andmike@xxxxxxxxxxxxxxxxxx
>
> 1.) Dmesg
> [ 35.104483] Buffer I/O error on device sda, logical block 0
> [ 35.104493] ------------[ cut here ]------------
> [ 35.104496] WARNING: at
> /home/data/xbuild/source/linux-2.6_work/lib/list_debug.c:30
> __list_add+0x6e/0x87()
> [ 35.104499] list_add corruption. prev->next should be next
> (ffff88007c5be568), but was ffff88007bd3ce88. (prev=ffff88007bd3ce88).
> [ 35.104501] Modules linked in: sd_mod(+) usbcore(+) dm_snapshot dm_mod
> edd ext3 jbd fan mptsas mptscsih mptbase scsi_transport_sas lpfc
> scsi_transport_fc scsi_dh_rdac scsi_dh scsi_mod thermal processor
> [ 35.104512] Pid: 1168, comm: modprobe Not tainted
> 2.6.28-rc2-00044-g9678cc9 #1
> [ 35.104514] Call Trace:
> [ 35.104521] [<ffffffff8023a368>] warn_slowpath+0xae/0xd5
> [ 35.104527] [<ffffffff80256daf>] ? trace_hardirqs_off+0xd/0xf
> [ 35.104531] [<ffffffff8025ad17>] ? __lock_acquire+0x1541/0x155d
> [ 35.104537] [<ffffffff80457e17>] ? printk+0x67/0x70
> [ 35.104542] [<ffffffff80335106>] ? __ratelimit+0xb6/0xc0
> [ 35.104546] [<ffffffff80387d9e>] ? mix_pool_bytes_extract+0x13e/0x14d
> [ 35.104549] [<ffffffff80256daf>] ? trace_hardirqs_off+0xd/0xf
> [ 35.104553] [<ffffffff8045acb9>] ? _spin_unlock_irqrestore+0x38/0x47
> [ 35.104556] [<ffffffff8033b96b>] __list_add+0x6e/0x87
> [ 35.104561] [<ffffffff80327c6a>] blk_add_timer+0x99/0xe4
> [ 35.104564] [<ffffffff803219d4>] elv_dequeue_request+0x53/0x55
> [ 35.104567] [<ffffffff80323395>] end_that_request_last+0x4b/0x1e5
> [ 35.104570] [<ffffffff80323610>] __blk_end_request+0x3c/0x45
> [ 35.104572] [<ffffffff80321b9c>] elv_next_request+0x1c6/0x234
> [ 35.104576] [<ffffffff80243777>] ? lock_timer_base+0x26/0x4a
> [ 35.104608] [<ffffffffa0028d0a>] scsi_request_fn+0x93/0x510 [scsi_mod]
> [ 35.104611] [<ffffffff80323e02>] __generic_unplug_device+0x27/0x2c
> [ 35.104614] [<ffffffff80323e2b>] blk_start_queueing+0x24/0x26
> [ 35.104617] [<ffffffff8032ec40>] cfq_insert_request+0x333/0x352
> [ 35.104620] [<ffffffff80321dff>] elv_insert+0x1f5/0x29e
> [ 35.104622] [<ffffffff80321f3e>] __elv_add_request+0x96/0x9f
> [ 35.104625] [<ffffffff803249d6>] __make_request+0x405/0x46e
> [ 35.104628] [<ffffffff80258eed>] ? trace_hardirqs_on_caller+0xf9/0x124
> [ 35.104631] [<ffffffff8032306b>] generic_make_request+0x3a6/0x3e9
> [ 35.104635] [<ffffffff8027c1e3>] ? mempool_alloc+0x5b/0x113
> [ 35.104638] [<ffffffff80323161>] submit_bio+0xb3/0xbc
> [ 35.104643] [<ffffffff802c650f>] submit_bh+0xea/0x10e
> [ 35.104647] [<ffffffff802c98a3>] block_read_full_page+0x273/0x292
> [ 35.104650] [<ffffffff802cb011>] ? blkdev_get_block+0x0/0x5d
> [ 35.104652] [<ffffffff80279dd3>] ? __lock_page+0x63/0x6a
> [ 35.104656] [<ffffffff802cc502>] blkdev_readpage+0x13/0x15
> [ 35.104658] [<ffffffff8027a454>] read_cache_page_async+0x118/0x143
> [ 35.104661] [<ffffffff802cc4ef>] ? blkdev_readpage+0x0/0x15
> [ 35.104663] [<ffffffff8027a48d>] read_cache_page+0xe/0x46
> [ 35.104668] [<ffffffff802f03a0>] read_dev_sector+0x2e/0x93
> [ 35.104671] [<ffffffff802f411f>] read_lba+0x5b/0xb3
> [ 35.104674] [<ffffffff80258f25>] ? trace_hardirqs_on+0xd/0xf
> [ 35.104677] [<ffffffff802f43cb>] efi_partition+0x9f/0x5f8
> [ 35.104679] [<ffffffff80258f25>] ? trace_hardirqs_on+0xd/0xf
> [ 35.104682] [<ffffffff80258eed>] ? trace_hardirqs_on_caller+0xf9/0x124
> [ 35.104686] [<ffffffff802f0bb2>] rescan_partitions+0x159/0x2e1
> [ 35.104693] [<ffffffffa01a047a>] ? sd_open+0xcd/0x18d [sd_mod]
> [ 35.104695] [<ffffffff802cbf4b>] __blkdev_get+0x1ff/0x2cf
> [ 35.104699] [<ffffffff80332697>] ? kobject_put+0x47/0x4b
> [ 35.104701] [<ffffffff802cc026>] blkdev_get+0xb/0xd
> [ 35.104704] [<ffffffff802f04e5>] register_disk+0xe0/0x145
> [ 35.104707] [<ffffffff80329280>] add_disk+0xc0/0x124
> [ 35.104711] [<ffffffffa01a1fa8>] sd_probe+0x2c6/0x39e [sd_mod]
> [ 35.104715] [<ffffffff802f6c1e>] ? sysfs_create_link+0xe/0x10
> [ 35.104719] [<ffffffff803ad9f2>] driver_probe_device+0xc0/0x16e
> [ 35.104721] [<ffffffff803adb02>] __driver_attach+0x62/0x8c
> [ 35.104724] [<ffffffff803adaa0>] ? __driver_attach+0x0/0x8c
> [ 35.104726] [<ffffffff803ad269>] bus_for_each_dev+0x52/0x8c
> [ 35.104729] [<ffffffff803ad83a>] driver_attach+0x1c/0x1e
> [ 35.104731] [<ffffffff803acb2a>] bus_add_driver+0xba/0x207
> [ 35.104734] [<ffffffff803adcf6>] driver_register+0xab/0x12b
> [ 35.104749] [<ffffffffa002dcbc>] scsi_register_driver+0x11/0x13
> [scsi_mod]
> [ 35.104752] [<ffffffffa01ac0a4>] init_sd+0xa4/0xff [sd_mod]
> [ 35.104756] [<ffffffffa01ac000>] ? init_sd+0x0/0xff [sd_mod]
> [ 35.104760] [<ffffffff80209058>] _stext+0x58/0x138
> [ 35.104763] [<ffffffff80256daf>] ? trace_hardirqs_off+0xd/0xf
> [ 35.104766] [<ffffffff8045acb9>] ? _spin_unlock_irqrestore+0x38/0x47
> [ 35.104769] [<ffffffff80233a6c>] ? try_to_wake_up+0x186/0x198
> [ 35.104772] [<ffffffff80258f25>] ? trace_hardirqs_on+0xd/0xf
> [ 35.104775] [<ffffffff80258eed>] ? trace_hardirqs_on_caller+0xf9/0x124
> [ 35.104780] [<ffffffff802642a7>] sys_init_module+0xab/0x1bc
> [ 35.104783] [<ffffffff8020be9b>] system_call_fastpath+0x16/0x1b
> [ 35.104785] ---[ end trace 08ddd733955d992c ]---
> [
>
> 2.) Patch
>
> From 698916fcee612e84ecce89f27ea66dd5f21bc351 Mon Sep 17 00:00:00 2001
> From: Mike Anderson <andmike@xxxxxxxxxxxxxxxxxx>
> Date: Thu, 30 Oct 2008 02:16:20 -0700
> Subject: [PATCH 1/1] blk: move blk_delete_timer call in end_that_request_last
>
> Move the calling blk_delete_timer to later in end_that_request_last to
> address an issue where blkdev_dequeue_request may have add a timer for the
> request.
>
> Signed-off-by: Mike Anderson <andmike@xxxxxxxxxxxxxxxxxx>
> ---
> block/blk-core.c | 4 ++--
> 1 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/block/blk-core.c b/block/blk-core.c
> index c3df30c..10e8a64 100644
> --- a/block/blk-core.c
> +++ b/block/blk-core.c
> @@ -1770,8 +1770,6 @@ static void end_that_request_last(struct request *req, int error)
> {
> struct gendisk *disk = req->rq_disk;
>
> - blk_delete_timer(req);
> -
> if (blk_rq_tagged(req))
> blk_queue_end_tag(req->q, req);
>
> @@ -1781,6 +1779,8 @@ static void end_that_request_last(struct request *req, int error)
> if (unlikely(laptop_mode) && blk_fs_request(req))
> laptop_io_completion();
>
> + blk_delete_timer(req);
> +
> /*
> * Account IO completion. bar_rq isn't accounted as a normal
> * IO on queueing nor completion. Accounting the containing
> --
> 1.5.6.5
Good catch, I queued this up for 2.6.28 (and added Tejuns ack).
--
Jens Axboe
--
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