Re: WARNING: CPU: 15 PID: 0 at block/blk-mq.c:1111 __blk_mq_run_hw_queue+0x1d8/0x1f0

[Bart Van Assche <Bart.VanAssche@wdc.com>]

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@us.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?

Thanks,

Bart.