Re: [IB/srpt] c804af2c1d: last_state.test.blktests.exit_code.143

[Yamin Friedman]

On 8/2/2020 6:05 PM, Bart Van Assche wrote:
> On 2020-08-01 23:09, kernel test robot wrote:
> > Greeting,
> >
> > FYI, we noticed the following commit (built with gcc-9):
> >
> > commit: c804af2c1d3152c0cf877eeb50d60c2d49ac0cf0 ("IB/srpt: use new shared CQ mechanism")
> > https://git.kernel.org/cgit/linux/kernel/git/rdma/rdma.git for-next
> >
> >
> > in testcase: blktests
> > with following parameters:
> >
> > 	test: srp-group1
> > 	ucode: 0x21
> >
> >
> >
> > on test machine: 4 threads Intel(R) Core(TM) i3-3220 CPU @ 3.30GHz with 4G memory
> >
> > caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
> >
> >
> >
> >
> > If you fix the issue, kindly add following tag
> > Reported-by: kernel test robot <rong.a.chen@xxxxxxxxx>
> >
> >
> > user  :notice: [   44.688140] 2020-08-01 16:10:22 ./check srp/001 srp/002 srp/003 srp/004 srp/005 srp/006 srp/007 srp/008 srp/009 srp/010 srp/011 srp/012 srp/013 srp/015
> > user  :notice: [   44.706657] srp/001 (Create and remove LUNs)
> > user  :notice: [   44.718405] srp/001 (Create and remove LUNs)                             [passed]
> > user  :notice: [   44.729902]     runtime  ...  1.972s
> > user  :notice: [   99.038748] IPMI BMC is not supported on this machine, skip bmc-watchdog setup!
> > user  :notice: [ 3699.039790] Sat Aug  1 17:11:22 UTC 2020 detected soft_timeout
> > user  :notice: [ 3699.060341] kill 960 /usr/bin/time -v -o /tmp/lkp/blktests.time /lkp/lkp/src/tests/blktests
> Yamin and Max, can you take a look at this? The SRP tests from the
> blktests repository pass reliably with kernel version v5.7 and before.
> With label next-20200731 from linux-next however that test triggers the
> following hang:

I will look into it.

> sd 8:0:0:0: [sda] Synchronizing SCSI cache
> rdma_rxe: not configured on eth0
> rdma_rxe: not configured on lo
> INFO: task modprobe:1894 blocked for more than 122 seconds.
>        Not tainted 5.8.0-rc7-next-20200731-dbg+ #3
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> modprobe        D27624  1894   1081 0x00004000
> Call Trace:
>   __schedule+0x4ee/0x1170
>   schedule+0x7f/0x170
>   schedule_timeout+0x453/0x6f0
>   wait_for_completion+0x126/0x1b0
>   disable_device+0x12a/0x1c0 [ib_core]
>   __ib_unregister_device+0x64/0x100 [ib_core]
>   ib_unregister_driver+0x11c/0x180 [ib_core]
>   rxe_module_exit+0x1e/0x36 [rdma_rxe]
>   __x64_sys_delete_module+0x22a/0x310
>   do_syscall_64+0x36/0x80
>   entry_SYSCALL_64_after_hwframe+0x44/0xa9
> RIP: 0033:0x7f8d0e0c8a3b
> Code: Bad RIP value.
> RSP: 002b:00007ffe8238f798 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0
> RAX: ffffffffffffffda RBX: 000055a2c7d9be80 RCX: 00007f8d0e0c8a3b
> RDX: 0000000000000000 RSI: 0000000000000800 RDI: 000055a2c7d9bee8
> RBP: 000055a2c7d9be80 R08: 0000000000000000 R09: 0000000000000000
> R10: 00007f8d0e144ac0 R11: 0000000000000206 R12: 000055a2c7d9bee8
> R13: 0000000000000000 R14: 000055a2c7d9bee8 R15: 000055a2c7d9be80
>
> Showing all locks held in the system:
> 1 lock held by khungtaskd/53:
>   #0: ffffffff82895880 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x37/0x20f
> 1 lock held by modprobe/1894:
>   #0: ffff8881c5e8c660 (&device->unregistration_lock){+.+.}-{3:3}, at: __ib_unregister_device+0x23/0x100 [ib_core]
>
> =============================================
> INFO: task modprobe:1894 blocked for more than 245 seconds.
>        Not tainted 5.8.0-rc7-next-20200731-dbg+ #3
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> modprobe        D27624  1894   1081 0x00004000
> Call Trace:
>   __schedule+0x4ee/0x1170
>   schedule+0x7f/0x170
>   schedule_timeout+0x453/0x6f0
>   wait_for_completion+0x126/0x1b0
>   disable_device+0x12a/0x1c0 [ib_core]
>   __ib_unregister_device+0x64/0x100 [ib_core]
>   ib_unregister_driver+0x11c/0x180 [ib_core]
>   rxe_module_exit+0x1e/0x36 [rdma_rxe]
>   __x64_sys_delete_module+0x22a/0x310
>   do_syscall_64+0x36/0x80
>   entry_SYSCALL_64_after_hwframe+0x44/0xa9
> RIP: 0033:0x7f8d0e0c8a3b
> Code: Bad RIP value.
> RSP: 002b:00007ffe8238f798 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0
> RAX: ffffffffffffffda RBX: 000055a2c7d9be80 RCX: 00007f8d0e0c8a3b
> RDX: 0000000000000000 RSI: 0000000000000800 RDI: 000055a2c7d9bee8
> RBP: 000055a2c7d9be80 R08: 0000000000000000 R09: 0000000000000000
> R10: 00007f8d0e144ac0 R11: 0000000000000206 R12: 000055a2c7d9bee8
> R13: 0000000000000000 R14: 000055a2c7d9bee8 R15: 000055a2c7d9be80
>
> Showing all locks held in the system:
> 1 lock held by khungtaskd/53:
>   #0: ffffffff82895880 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x37/0x20f
> no locks held by systemd-journal/241.
> 1 lock held by modprobe/1894:
>   #0: ffff8881c5e8c660 (&device->unregistration_lock){+.+.}-{3:3}, at: __ib_unregister_device+0x23/0x100 [ib_core]
>
> =============================================