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Subject: Re: [PATCH v8 17/18] scsi: megaraid_sas: Added support for shared
 host tagset for cpuhotplug
To:     Qian Cai <cai@redhat.com>, <axboe@kernel.dk>, <jejb@linux.ibm.com>,
        <martin.petersen@oracle.com>, <don.brace@microsemi.com>,
        <kashyap.desai@broadcom.com>, <ming.lei@redhat.com>,
        <bvanassche@acm.org>, <dgilbert@interlog.com>,
        <paolo.valente@linaro.org>, <hare@suse.de>, <hch@lst.de>
CC:     <sumit.saxena@broadcom.com>, <linux-block@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>, <linux-scsi@vger.kernel.org>,
        <esc.storagedev@microsemi.com>, <megaraidlinux.pdl@broadcom.com>,
        <chenxiang66@hisilicon.com>, <luojiaxing@huawei.com>,
        Hannes Reinecke <hare@suse.com>
References: <1597850436-116171-1-git-send-email-john.garry@huawei.com>
 <1597850436-116171-18-git-send-email-john.garry@huawei.com>
 <fe3dff7dae4494e5a88caffbb4d877bbf472dceb.camel@redhat.com>
From:   John Garry <john.garry@huawei.com>
Message-ID: <385d5408-6ba2-6bb6-52d3-b59c9aa9c5e5@huawei.com>
Date:   Mon, 2 Nov 2020 14:51:48 +0000
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On 02/11/2020 14:17, Qian Cai wrote:
> [  251.961152][  T330] INFO: task systemd-udevd:567 blocked for more than 122 seconds.
> [  251.968876][  T330]       Not tainted 5.10.0-rc1-next-20201102 #1
> [  251.975003][  T330] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> [  251.983546][  T330] task:systemd-udevd   state:D stack:27224 pid:  567 ppid:   506 flags:0x00004324
> [  251.992620][  T330] Call Trace:
> [  251.995784][  T330]  __schedule+0x71d/0x1b60
> [  252.000067][  T330]  ? __sched_text_start+0x8/0x8
> [  252.004798][  T330]  schedule+0xbf/0x270
> [  252.008735][  T330]  schedule_timeout+0x3fc/0x590
> [  252.013464][  T330]  ? usleep_range+0x120/0x120
> [  252.018008][  T330]  ? wait_for_completion+0x156/0x250
> [  252.023176][  T330]  ? lock_downgrade+0x700/0x700
> [  252.027886][  T330]  ? rcu_read_unlock+0x40/0x40
> [  252.032530][  T330]  ? do_raw_spin_lock+0x121/0x290
> [  252.037412][  T330]  ? lockdep_hardirqs_on_prepare+0x27c/0x3d0
> [  252.043268][  T330]  ? _raw_spin_unlock_irq+0x1f/0x30
> [  252.048331][  T330]  wait_for_completion+0x15e/0x250
> [  252.053323][  T330]  ? wait_for_completion_interruptible+0x320/0x320
> [  252.059687][  T330]  ? lockdep_hardirqs_on_prepare+0x27c/0x3d0
> [  252.065543][  T330]  ? _raw_spin_unlock_irq+0x1f/0x30
> [  252.070606][  T330]  __flush_work+0x42a/0x900
> [  252.074989][  T330]  ? queue_delayed_work_on+0x90/0x90
> [  252.080139][  T330]  ? __queue_work+0x463/0xf40
> [  252.084700][  T330]  ? init_pwq+0x320/0x320
> [  252.088891][  T330]  ? queue_work_on+0x5e/0x80
> [  252.093364][  T330]  ? trace_hardirqs_on+0x1c/0x150
> [  252.098255][  T330]  work_on_cpu+0xe7/0x130
> [  252.102461][  T330]  ? flush_delayed_work+0xc0/0xc0
> [  252.107342][  T330]  ? __mutex_unlock_slowpath+0xd4/0x670
> [  252.112764][  T330]  ? work_debug_hint+0x30/0x30
> [  252.117391][  T330]  ? pci_device_shutdown+0x80/0x80
> [  252.122378][  T330]  ? cpumask_next_and+0x57/0x80
> [  252.127094][  T330]  pci_device_probe+0x500/0x5c0
> [  252.131824][  T330]  ? pci_device_remove+0x1f0/0x1f0

Is CONFIG_DEBUG_TEST_DRIVER_REMOVE enabled? I figure it is, with this call.

Or please share the .config

Cheers,
John

> [  252.136805][  T330]  really_probe+0x207/0xad0
> [  252.141191][  T330]  ? device_driver_attach+0x120/0x120
> [  252.146428][  T330]  driver_probe_device+0x1f1/0x370
> [  252.151424][  T330]  device_driver_attach+0xe5/0x120
> [  252.156399][  T330]  __driver_attach+0xf0/0x260
> [  252.160953][  T330]  bus_for_each_dev+0x117/0x1a0
> [  252.165669][  T330]  ? subsys_dev_iter_exit+0x10/0x10
> [  252.170731][  T330]  bus_add_driver+0x399/0x560
> [  252.175289][  T330]  driver_register+0x189/0x310
> [  252.179919][  T330]  ? 0xffffffffc05c1000
> [  252.183960][  T330]  megasas_init+0x117/0x1000 [megaraid_sas]
> [  252.189713][  T330]  do_one_initcall+0xf6/0x510
> [  252.194267][  T330]  ? perf_trace_initcall_level+0x490/0x490
> [  252.199940][  T330]  ? kasan_unpoison_shadow+0x30/0x40
> [  252.205104][  T330]  ? __kasan_kmalloc.constprop.11+0xc1/0xd0
> [  252.210859][  T330]  ? do_init_module+0x49/0x6c0
> [  252.215500][  T330]  ? kmem_cache_alloc_trace+0x11f/0x1e0
> [  252.220925][  T330]  ? kasan_unpoison_shadow+0x30/0x40
> [  252.226068][  T330]  do_init_module+0x1ed/0x6c0
> [  252.230608][  T330]  load_module+0x4a59/0x5d20
> [  252.235081][  T330]  ? layout_and_allocate+0x2770/0x2770
> [  252.240404][  T330]  ? __vmalloc_node+0x8d/0x100
> [  252.245046][  T330]  ? kernel_read_file+0x485/0x5a0
> [  252.249934][  T330]  ? kernel_read_file+0x305/0x5a0
> [  252.254839][  T330]  ? __x64_sys_fsconfig+0x970/0x970
> [  252.259903][  T330]  ? __do_sys_finit_module+0xff/0x180
> [  252.265153][  T330]  __do_sys_finit_module+0xff/0x180
> [  252.270216][  T330]  ? __do_sys_init_module+0x1d0/0x1d0
> [  252.275465][  T330]  ? __fget_files+0x1c3/0x2e0
> [  252.280010][  T330]  do_syscall_64+0x33/0x40
> [  252.284304][  T330]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
> [  252.290054][  T330] RIP: 0033:0x7fbb3e2fa78d
> [  252.294348][  T330] Code: Unable to access opcode bytes at RIP 0x7fbb3e2fa763.
> [  252.301584][  T330] RSP: 002b:00007ffe572e8d18 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
> [  252.309855][  T330] RAX: ffffffffffffffda RBX: 000055c7795d90f0 RCX: 00007fbb3e2fa78d
> [  252.317703][  T330] RDX: 0000000000000000 RSI: 00007fbb3ee6c82d RDI: 0000000000000006
> [  252.325553][  T330] RBP: 00007fbb3ee6c82d R08: 0000000000000000 R09: 00007ffe572e8e40
> [  252.333402][  T330] R10: 0000000000000006 R11: 0000000000000246 R12: 0000000000000000
> [  252.341257][  T330] R13: 000055c7795930e0 R14: 0000000000020000 R15: 0000000000000000
> [  252.349117][  T330]