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Date:	Thu, 3 Jan 2013 09:28:15 -0600
From:	Ed Cashin <ecashin@...aid.com>
To:	Jens Axboe <axboe@...nel.dk>
CC:	Josh Boyer <jwboyer@...hat.com>,
	"mitko@...ksoft-bg.com" <mitko@...ksoft-bg.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kernel-team@...oraproject.org" <kernel-team@...oraproject.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: Oops on aoe module removal

On Jan 3, 2013, at 9:12 AM, Jens Axboe wrote:

> On 2013-01-03 15:09, Jens Axboe wrote:
>> On 2013-01-03 15:02, Ed Cashin wrote:
>>> On Jan 3, 2013, at 8:25 AM, Josh Boyer wrote:
>>> 
>>>> Hello,
>>>> 
>>>> We have a user that has reported an oops when removing the aoe module.
>>>> This seems to have been happening since the 3.4 kernel, as you can see
>>>> in this bug: https://bugzilla.redhat.com/show_bug.cgi?id=853064
>>>> 
>>>> The recreate steps and oops output from a 3.6.11 kernel is below.  Any
>>>> thoughts on what could be causing this?
>>>> 
>>>> josh
>>>> 
>>>> 
>>>> I run the following commands sequentially
>>>> 
>>>> - modprobe aoe
>>>> - dmesg:
>>>> [699170.611997] aoe: AoE v47 initialised.
>>>> [699170.653980] aoe: e4.1: setting 8192 byte data frames on eth1:000423d36ac3
>>>> [699170.654106] aoe: e6.0: setting 8192 byte data frames on eth1:000423d36ac3
>>>> [699170.654961] aoe: e6.2: setting 8192 byte data frames on eth1:000423d36ac3
>>>> [699170.654961] aoe: e6.3: setting 8192 byte data frames on eth1:000423d36ac3
>>>> [699170.654961] aoe: e8.1: setting 8192 byte data frames on eth1:000423d36ac3
>>>> [699170.654961] aoe: e8.2: setting 8192 byte data frames on eth1:000423d36ac3
>>>> [699170.654961] aoe: e8.10: setting 8192 byte data frames on eth1:000423d36ac3
>>>> [699170.654961] aoe: e8.11: setting 8192 byte data frames on eth1:000423d36ac3
>>>> [699170.654961] aoe: 000423d36ac3 e4.1 v0100 has 33554432 sectors
>>>> [699170.654961] aoe: 000423d36ac3 e6.0 v0100 has 12582912 sectors
>>>> [699170.654961] aoe: 000423d36ac3 e6.2 v0100 has 16777216 sectors
>>>> [699170.702143] aoe: 000423d36ac3 e6.3 v0100 has 104857600 sectors
>>>> [699170.706391] aoe: 000423d36ac3 e8.1 v0100 has 272629760 sectors
>>>> [699170.710623] aoe: 000423d36ac3 e8.2 v0100 has 67108864 sectors
>>>> [699170.714851] aoe: 000423d36ac3 e8.10 v0100 has 33554432 sectors
>>>> [699170.719056] aoe: 000423d36ac3 e8.11 v0100 has 67108864 sectors
>>>> [699170.824774]  etherd/e4.1: p1
>>>> [699170.829069]  etherd/e6.0: p1 p2
>>>> [699170.833274]  etherd/e8.1: p1 p2
>>>> [699170.837329]  etherd/e8.2: p1
>>>> [699170.841204]  etherd/e8.10: p1
>>>> [699170.845030]  etherd/e8.11: p1
>>>> [699170.848706]  etherd/e6.3: unknown partition table
>>>> [699170.852384]  etherd/e6.2: unknown partition table
>>>> 
>>>> - lsmod |grep aoe
>>>> aoe                    32214  0	  
>>>> 
>>>> - modprobe -vr aoe
>>>> - dmesg:
>>>> [699231.304689] ------------[ cut here ]------------
>>>> [699231.308319] WARNING: at lib/list_debug.c:62 __list_del_entry+0x82/0xd0()
>>>> [699231.312031] Hardware name: S5000VSA
>>>> [699231.315658] list_del corruption. next->prev should be ffff880009fa37e8, but was ffffffff81c79c00
>>>> [699231.319352] Modules linked in: aoe(-) ip6table_filter ip6_tables ebtable_nat ebtables lockd sunrpc bridge 8021q garp stp llc vfat fat binfmt_misc iTCO_wdt iTCO_vendor_support vhost_net lpc_ich radeon tun macvtap mfd_core serio_raw coretemp i2c_algo_bit ttm i5000_edac macvlan drm_kms_helper e1000e edac_core microcode i5k_amb shpchp i2c_i801 drm kvm_intel i2c_core kvm ioatdma dca raid1
>>>> [699231.336259] Pid: 8584, comm: modprobe Not tainted 3.6.11-1.fc17.x86_64 #1
>>>> [699231.340561] Call Trace:
>>>> [699231.344865]  [<ffffffff8105c8ef>] warn_slowpath_common+0x7f/0xc0
>>>> [699231.349212]  [<ffffffff8105c9e6>] warn_slowpath_fmt+0x46/0x50
>>>> [699231.353595]  [<ffffffff812eee52>] __list_del_entry+0x82/0xd0
>>>> [699231.357954]  [<ffffffff812eeeb1>] list_del+0x11/0x40
>>>> [699231.362319]  [<ffffffff812f6458>] percpu_counter_destroy+0x28/0x50
>>>> [699231.366712]  [<ffffffff8114c513>] bdi_destroy+0x43/0x140
>>>> [699231.371127]  [<ffffffff812be20c>] blk_release_queue+0x8c/0xc0
>>>> [699231.375454]  [<ffffffff812dc322>] kobject_cleanup+0x82/0x1b0
>>>> [699231.379675]  [<ffffffff812dc1ab>] kobject_put+0x2b/0x60
>>>> [699231.383851]  [<ffffffff812b80a5>] blk_put_queue+0x15/0x20
>>>> [699231.387899]  [<ffffffff812bc659>] blk_cleanup_queue+0xc9/0xe0
>>>> [699231.391794]  [<ffffffffa01f53f5>] aoedev_freedev+0x135/0x150 [aoe]
>>>> [699231.395668]  [<ffffffffa01f59a5>] aoedev_exit+0x65/0x80 [aoe]
>>>> [699231.399493]  [<ffffffffa01f5afe>] aoe_exit+0x2e/0x40 [aoe]
>>>> [699231.403273]  [<ffffffff810bdefe>] sys_delete_module+0x16e/0x2d0
>>>> [699231.407119]  [<ffffffff8161db56>] ? __schedule+0x3c6/0x7a0
>>>> [699231.411050]  [<ffffffff8119054a>] ? sys_write+0x4a/0x90
>>>> [699231.415033]  [<ffffffff81627329>] system_call_fastpath+0x16/0x1b
>>>> [699231.419117] ---[ end trace 9e1558af1964b569 ]---
>>>> [699231.423248] ------------[ cut here ]------------
>>> 
>>> Thanks for the report.  The problem seems to be older than that (see
>>> 2.6.32 below), and it seems to be related to changes that first
>>> appeared in 2.6.24.  I'm going to investigate the changes introduced
>>> in the commit below to see whether the aoe driver needed updating when
>>> they went in.  I'm Cc-ing Peter Zijlstra in case this rings any bells.
>> 
>> I highly doubt that has anything to do with it. Since it triggers
>> immediately on rmmod after modprobe (and not having set a device up,
>> presumably, being the key), it looks like a generic bug in aoeblk.
>> 
>> Ed, can you reproduce the issue?
> 
> Quick guess...
> 
> 
> diff --git a/drivers/block/aoe/aoedev.c b/drivers/block/aoe/aoedev.c
> index 98f2965..e4473af 100644
> --- a/drivers/block/aoe/aoedev.c
> +++ b/drivers/block/aoe/aoedev.c
> @@ -280,8 +280,8 @@ freedev(struct aoedev *d)
> 	if (d->gd) {
> 		aoedisk_rm_sysfs(d);
> 		del_gendisk(d->gd);
> -		put_disk(d->gd);
> 		blk_cleanup_queue(d->blkq);
> +		put_disk(d->gd);
> 	}
> 	t = d->targets;
> 	e = t + d->ntargets;

Yes, I can reproduce it on 3.5.6.  There are devices up, none down, when I do rmmod.  If no aoe devices are present, the warnings do not appear.

The suggestion above to move put_disk after blk_cleanup_queue doesn't affect the list_del warnings, but thanks for the quick guess---Is that something we need to change regardless of the issue at hand?

-- 
  Ed Cashin
  ecashin@...aid.com


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