linux-kernel - Re: WARNING: CPU: 15 PID: 0 at block/blk-mq.c:1111 __blk_mq_run_hw

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Date:   Thu, 17 Aug 2017 14:18:18 -0500
From:   Brian King <brking@...ux.vnet.ibm.com>
To:     Bart Van Assche <Bart.VanAssche@....com>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "abdhalee@...ux.vnet.ibm.com" <abdhalee@...ux.vnet.ibm.com>
Cc:     "sachinp@...ux.vnet.ibm.com" <sachinp@...ux.vnet.ibm.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "sfr@...b.auug.org.au" <sfr@...b.auug.org.au>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "brking@...ibm.com" <brking@...ibm.com>,
        "axboe@...nel.dk" <axboe@...nel.dk>
Subject: Re: WARNING: CPU: 15 PID: 0 at block/blk-mq.c:1111
 __blk_mq_run_hw_queue+0x1d8/0x1f0

On 08/17/2017 10:32 AM, Bart Van Assche wrote:
> On Wed, 2017-08-16 at 15:10 -0500, Brian King wrote:
>> On 08/16/2017 01:15 PM, Bart Van Assche wrote:
>>> On Wed, 2017-08-16 at 23:37 +0530, Abdul Haleem wrote:
>>>> Linux-next booted with the below warnings on powerpc
>>>>
>>>> [ ... ]
>>>>
>>>> boot warnings:
>>>> --------------
>>>> kvm: exiting hardware virtualization
>>>> ------------[ cut here ]------------
>>>> WARNING: CPU: 15 PID: 0 at block/blk-mq.c:1111 __blk_mq_run_hw_queue
>>>> +0x1d8/0x1f0
>>>> Modules linked in: iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4
>>>> Call Trace:
>>>> [c000000ffff37990] [c00000000088f7b0] __blk_mq_delay_run_hw_queue
>>>> +0x1f0/0x210
>>>> [c000000ffff379d0] [c00000000088fcb8] blk_mq_start_hw_queue+0x58/0x80
>>>> [c000000ffff379f0] [c00000000088fd40] blk_mq_start_hw_queues+0x60/0xb0
>>>> [c000000ffff37a30] [c000000000ae2b54] scsi_kick_queue+0x34/0xa0
>>>> [c000000ffff37a50] [c000000000ae2f70] scsi_run_queue+0x3b0/0x660
>>>> [c000000ffff37ac0] [c000000000ae7ed4] scsi_run_host_queues+0x64/0xc0
>>>> [c000000ffff37b00] [c000000000ae7f64] scsi_unblock_requests+0x34/0x60
>>>> [c000000ffff37b20] [c000000000b14998] ipr_ioa_bringdown_done+0xf8/0x3a0
>>>> [c000000ffff37bc0] [c000000000b12528] ipr_reset_ioa_job+0xd8/0x170
>>>> [c000000ffff37c00] [c000000000b18790] ipr_reset_timer_done+0x110/0x160
>>>> [c000000ffff37c50] [c00000000024db50] call_timer_fn+0xa0/0x3a0
>>>> [c000000ffff37ce0] [c00000000024e058] expire_timers+0x1b8/0x350
>>>> [c000000ffff37d50] [c00000000024e2f0] run_timer_softirq+0x100/0x3e0
>>>> [c000000ffff37df0] [c000000000162edc] __do_softirq+0x20c/0x620
>>>> [c000000ffff37ee0] [c000000000163a80] irq_exit+0x230/0x290
>>>> [c000000ffff37f10] [c00000000001d770] __do_irq+0x170/0x410
>>>> [c000000ffff37f90] [c00000000003ea20] call_do_irq+0x14/0x24
>>>> [c0000007f84e3a70] [c00000000001dae0] do_IRQ+0xd0/0x190
>>>> [c0000007f84e3ac0] [c000000000008c58] hardware_interrupt_common
>>>> +0x158/0x160
>>>
>>> Hello Brian,
>>>
>>> In the MAINTAINERS file I found the following:
>>>
>>> IBM Power Linux RAID adapter
>>> M:      Brian King <brking@...ibm.com>
>>> S:      Supported
>>> F:      drivers/scsi/ipr.*
>>>
>>> Is that information up-to-date? Do you agree that the above message indicates
>>> a bug in the ipr driver?
>>
>> Yes. Can you try with this patch that is in 4.13/scsi-fixes:
>>
>> https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git/commit/?h=4.13/scsi-fixes&id=b0e17a9b0df29590c45dfb296f541270a5941f41
> 
> Hello Brian,
> 
> Sorry but I don't have access to a setup on which I can test the ipr driver ...

Understood. That request was intended for Abdul, who reported the issue.
I should have just cc'ed you...

Thanks,

Brian

-- 
Brian King
Power Linux I/O
IBM Linux Technology Center