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 15:32:22 +0000
From:   Bart Van Assche <Bart.VanAssche@....com>
To:     "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "abdhalee@...ux.vnet.ibm.com" <abdhalee@...ux.vnet.ibm.com>,
        "brking@...ux.vnet.ibm.com" <brking@...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 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 ...

Bart.