From: Mike Snitzer <snitzer@redhat.com>
To: Ryan Harper <ryanh@us.ibm.com>
Cc: Tejun Heo <tj@kernel.org>, Mikulas Patocka <mpatocka@redhat.com>,
dm-devel@redhat.com, Vivek Goyal <vgoyal@redhat.com>,
john.cooper@redhat.com, rusty@rustcorp.com.au, hch@infradead.org,
kvm@vger.kernel.org
Subject: Re: [REGRESSION][BISECTED] virtio-blk serial attribute causes guest to hang [Was: Re: [PATCH UPDATED 4/5] dm: implement REQ_FLUSH/FUA support for request-based dm]
Date: Thu, 9 Sep 2010 15:15:55 -0400 [thread overview]
Message-ID: <20100909191555.GA14486@redhat.com> (raw)
In-Reply-To: <20100909183554.GK30086@us.ibm.com>
On Thu, Sep 09 2010 at 2:35pm -0400,
Ryan Harper <ryanh@us.ibm.com> wrote:
> * Mike Snitzer <snitzer@redhat.com> [2010-09-09 12:56]:
> > I have verified that I no longer get the hang if I switch the root
> > device from virtio to ide.
>
> And in the failing case, do you see:
>
> /sys/block/vda/serial
>
> attribute in sysfs?
[root@rhel6 ~]# ls -al /sys/block/vda/serial
-r--r--r-- 1 root root 4096 Sep 9 15:07 /sys/block/vda/serial
[root@rhel6 ~]# cat /sys/block/vda/serial
[root@rhel6 ~]#
If I try to access 'serial' once the reproducer script has hung the cat
also hangs:
cat D 00000000fffe5d48 5664 2386 2049 0x00000080
ffff880075129ce8 0000000000000046 ffff880075129c88 ffff880000000000
ffff880075129fd8 ffff8800758aa400 00000000001d4040 ffff880075129fd8
00000000001d4040 00000000001d4040 00000000001d4040 00000000001d4040
Call Trace:
[<ffffffff8136de23>] io_schedule+0x73/0xb5
[<ffffffff811b6882>] get_request_wait+0xf2/0x180
[<ffffffff8105d8da>] ? autoremove_wake_function+0x0/0x39
[<ffffffff811b6951>] blk_get_request+0x41/0x71
[<ffffffff811b69ad>] blk_make_request+0x2c/0x8b
[<ffffffffa0016073>] virtblk_get_id+0x57/0x93 [virtio_blk]
[<ffffffffa00160d0>] virtblk_serial_show+0x21/0x4d [virtio_blk]
[<ffffffff81265f7c>] dev_attr_show+0x27/0x4e
[<ffffffff81157f0b>] ? sysfs_read_file+0x94/0x17f
[<ffffffff810c6d6b>] ? __get_free_pages+0x18/0x55
[<ffffffff81157f34>] sysfs_read_file+0xbd/0x17f
[<ffffffff81100e7a>] vfs_read+0xab/0x108
[<ffffffff8106e428>] ? trace_hardirqs_on_caller+0x11d/0x141
[<ffffffff81100f97>] sys_read+0x4a/0x6e
[<ffffffff81002bf2>] system_call_fastpath+0x16/0x1b
Taking a step back; why did you make the inability to add the 'serial'
attribute such a hard failure?
Strikes me as worthy of a non-fatal warning at most. The serial
attribute is added fine in this instance but I'm just curious.
Mike
next prev parent reply other threads:[~2010-09-09 19:15 UTC|newest]
Thread overview: 88+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-30 9:58 [PATCHSET 2.6.36-rc2] block, dm: finish REQ_FLUSH/FUA conversion, take#2 Tejun Heo
2010-08-30 9:58 ` Tejun Heo
2010-08-30 9:58 ` [PATCH 1/5] block: make __blk_rq_prep_clone() copy most command flags Tejun Heo
2010-08-30 9:58 ` Tejun Heo
2010-08-30 9:58 ` Tejun Heo
2010-09-01 15:30 ` Christoph Hellwig
2010-08-30 9:58 ` Tejun Heo
2010-08-30 9:58 ` [PATCH 2/5] dm: implement REQ_FLUSH/FUA support for bio-based dm Tejun Heo
2010-08-30 9:58 ` Tejun Heo
2010-09-01 13:43 ` Mike Snitzer
2010-09-01 13:50 ` Tejun Heo
2010-09-01 13:54 ` Mike Snitzer
2010-09-01 13:56 ` Tejun Heo
2010-08-30 9:58 ` Tejun Heo
2010-08-30 9:58 ` [PATCH 3/5] dm: relax ordering of bio-based flush implementation Tejun Heo
2010-08-30 9:58 ` Tejun Heo
2010-09-01 13:51 ` Mike Snitzer
2010-09-01 13:51 ` Mike Snitzer
2010-09-01 13:56 ` Tejun Heo
2010-09-01 13:56 ` Tejun Heo
2010-09-03 6:04 ` Kiyoshi Ueda
2010-09-03 9:42 ` Tejun Heo
2010-08-30 9:58 ` Tejun Heo
2010-08-30 9:58 ` [PATCH 4/5] dm: implement REQ_FLUSH/FUA support for request-based dm Tejun Heo
2010-08-30 9:58 ` Tejun Heo
2010-08-30 9:58 ` Tejun Heo
2010-08-30 9:58 ` Tejun Heo
2010-08-30 13:28 ` Mike Snitzer
2010-08-30 13:59 ` Tejun Heo
2010-08-30 15:07 ` Tejun Heo
2010-08-30 19:08 ` Mike Snitzer
2010-08-30 21:28 ` Mike Snitzer
2010-08-31 10:29 ` Tejun Heo
2010-08-31 13:02 ` Mike Snitzer
2010-08-31 13:14 ` Tejun Heo
2010-08-30 19:08 ` Mike Snitzer
2010-08-30 15:07 ` Tejun Heo
2010-08-30 15:42 ` [PATCH] block: initialize flush request with WRITE_FLUSH instead of REQ_FLUSH Tejun Heo
2010-08-30 15:42 ` Tejun Heo
2010-08-30 15:45 ` [PATCH UPDATED 4/5] dm: implement REQ_FLUSH/FUA support for request-based dm Tejun Heo
2010-08-30 19:18 ` Mike Snitzer
2010-08-30 19:18 ` Mike Snitzer
2010-09-01 7:15 ` Kiyoshi Ueda
2010-09-01 12:25 ` Mike Snitzer
2010-09-02 13:22 ` Tejun Heo
2010-09-02 13:32 ` Tejun Heo
2010-09-03 5:46 ` Kiyoshi Ueda
2010-09-02 17:43 ` [PATCH] block: make sure FSEQ_DATA request has the same rq_disk as the original Tejun Heo
2010-09-03 5:47 ` Kiyoshi Ueda
2010-09-03 9:33 ` Tejun Heo
2010-09-03 10:28 ` Kiyoshi Ueda
2010-09-03 11:42 ` Tejun Heo
2010-09-03 11:51 ` Kiyoshi Ueda
[not found] ` <20100830194731.GA10702@redhat.com>
2010-09-01 10:31 ` [PATCH UPDATED 4/5] dm: implement REQ_FLUSH/FUA support for request-based dm Mikulas Patocka
2010-09-01 11:20 ` Tejun Heo
2010-09-01 12:12 ` Mikulas Patocka
2010-09-01 12:42 ` Tejun Heo
2010-09-01 12:54 ` Mike Snitzer
2010-09-01 15:20 ` Mike Snitzer
2010-09-01 15:35 ` Mikulas Patocka
2010-09-01 17:07 ` Mike Snitzer
2010-09-01 18:59 ` Mike Snitzer
2010-09-02 3:22 ` Mike Snitzer
2010-09-02 10:24 ` Tejun Heo
2010-09-02 15:11 ` Mike Snitzer
2010-09-09 15:26 ` [REGRESSION][BISECTED] virtio-blk serial attribute causes guest to hang [Was: Re: [PATCH UPDATED 4/5] dm: implement REQ_FLUSH/FUA support for request-based dm] Mike Snitzer
2010-09-09 15:44 ` Ryan Harper
2010-09-09 15:57 ` Mike Snitzer
2010-09-09 16:03 ` Ryan Harper
2010-09-09 17:55 ` Mike Snitzer
2010-09-09 18:35 ` Ryan Harper
2010-09-09 19:15 ` Mike Snitzer [this message]
2010-09-09 19:43 ` Mike Snitzer
2010-09-09 20:14 ` Mike Snitzer
2010-09-09 20:30 ` Ryan Harper
2010-09-09 21:00 ` [PATCH] virtio-blk: put request that was created to retrieve the device id Mike Snitzer
2010-09-09 21:15 ` Christoph Hellwig
2010-09-17 14:58 ` Ryan Harper
2010-09-21 21:00 ` Christoph Hellwig
2010-10-08 16:06 ` [2.6.36 REGRESSION] " Mike Snitzer
2010-10-09 1:41 ` [PATCH] " Rusty Russell
2010-08-30 15:45 ` [PATCH UPDATED 4/5] dm: implement REQ_FLUSH/FUA support for request-based dm Tejun Heo
2010-08-30 13:59 ` [PATCH " Tejun Heo
2010-08-30 13:28 ` Mike Snitzer
2010-08-30 9:58 ` [PATCH 5/5] block: remove the WRITE_BARRIER flag Tejun Heo
2010-08-30 9:58 ` Tejun Heo
2010-08-30 9:58 ` Tejun Heo
2010-08-30 9:58 ` Tejun Heo
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