Re: [PATCH v8 17/18] scsi: megaraid_sas: Added support for shared host tagset for cpuhotplug

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On Tue, 2020-11-03 at 08:04 -0500, Qian Cai wrote:
> On Tue, 2020-11-03 at 10:54 +0000, John Garry wrote:
> > I have no x86 system to test that x86 config, though. How about 
> > v5.10-rc2 for this issue?
> 
> v5.10-rc2 is also broken here.

John, Kashyap, any update on this? If this is going to take a while to fix it
proper, should I send a patch to revert this or at least disable the feature by
default for megaraid_sas in the meantime, so it no longer breaks the existing
systems out there?

> 
> [  251.941451][  T330] INFO: task systemd-udevd:551 blocked for more than 122
> seconds.
> [  251.949176][  T330]       Not tainted 5.10.0-rc2 #3
> [  251.954094][  T330] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
> disables this message.
> [  251.962633][  T330] task:systemd-udevd   state:D stack:27160 pid:  551
> ppid:   506 flags:0x00000324
> [  251.971707][  T330] Call Trace:
> [  251.974871][  T330]  __schedule+0x71d/0x1b50
> [  251.979155][  T330]  ? kcore_callback+0x1d/0x1d
> [  251.983709][  T330]  schedule+0xbf/0x270
> [  251.987640][  T330]  schedule_timeout+0x3fc/0x590
> [  251.992370][  T330]  ? usleep_range+0x120/0x120
> [  251.996910][  T330]  ? wait_for_completion+0x156/0x250
> [  252.002080][  T330]  ? lock_downgrade+0x700/0x700
> [  252.006792][  T330]  ? rcu_read_unlock+0x40/0x40
> [  252.011435][  T330]  ? do_raw_spin_lock+0x121/0x290
> [  252.016324][  T330]  ? lockdep_hardirqs_on_prepare+0x27c/0x3d0
> [  252.022178][  T330]  ? _raw_spin_unlock_irq+0x1f/0x30
> [  252.027235][  T330]  wait_for_completion+0x15e/0x250
> [  252.032226][  T330]  ? wait_for_completion_interruptible+0x2f0/0x2f0
> [  252.038590][  T330]  ? lockdep_hardirqs_on_prepare+0x27c/0x3d0
> [  252.044443][  T330]  ? _raw_spin_unlock_irq+0x1f/0x30
> [  252.049502][  T330]  __flush_work+0x42a/0x900
> [  252.053882][  T330]  ? queue_delayed_work_on+0x90/0x90
> [  252.059025][  T330]  ? __queue_work+0x463/0xf40
> [  252.063583][  T330]  ? init_pwq+0x320/0x320
> [  252.067777][  T330]  ? queue_work_on+0x5e/0x80
> [  252.072249][  T330]  ? trace_hardirqs_on+0x1c/0x150
> [  252.077138][  T330]  work_on_cpu+0xe7/0x130
> [  252.081347][  T330]  ? flush_delayed_work+0xc0/0xc0
> [  252.086231][  T330]  ? __mutex_unlock_slowpath+0xd4/0x670
> [  252.091655][  T330]  ? work_debug_hint+0x30/0x30
> [  252.096284][  T330]  ? pci_device_shutdown+0x80/0x80
> [  252.101274][  T330]  ? cpumask_next_and+0x57/0x80
> [  252.105990][  T330]  pci_device_probe+0x500/0x5c0
> [  252.110703][  T330]  ? pci_device_remove+0x1f0/0x1f0
> [  252.115697][  T330]  really_probe+0x207/0xad0
> [  252.120065][  T330]  ? device_driver_attach+0x120/0x120
> [  252.125317][  T330]  driver_probe_device+0x1f1/0x370
> [  252.130291][  T330]  device_driver_attach+0xe5/0x120
> [  252.135281][  T330]  __driver_attach+0xf0/0x260
> [  252.139827][  T330]  bus_for_each_dev+0x117/0x1a0
> [  252.144552][  T330]  ? subsys_dev_iter_exit+0x10/0x10
> [  252.149609][  T330]  bus_add_driver+0x399/0x560
> [  252.154166][  T330]  driver_register+0x189/0x310
> [  252.158795][  T330]  ? 0xffffffffc05c5000
> [  252.162838][  T330]  megasas_init+0x117/0x1000 [megaraid_sas]
> [  252.168593][  T330]  do_one_initcall+0xf6/0x510
> [  252.173143][  T330]  ? perf_trace_initcall_level+0x490/0x490
> [  252.178809][  T330]  ? kasan_unpoison_shadow+0x30/0x40
> [  252.183973][  T330]  ? __kasan_kmalloc.constprop.11+0xc1/0xd0
> [  252.189728][  T330]  ? do_init_module+0x49/0x6c0
> [  252.194370][  T330]  ? kmem_cache_alloc_trace+0x12e/0x2a0
> [  252.199780][  T330]  ? kasan_unpoison_shadow+0x30/0x40
> [  252.204942][  T330]  do_init_module+0x1ed/0x6c0
> [  252.209479][  T330]  load_module+0x4a25/0x5cf0
> [  252.213950][  T330]  ? layout_and_allocate+0x2770/0x2770
> [  252.219271][  T330]  ? __vmalloc_node+0x8d/0x100
> [  252.223913][  T330]  ? kernel_read_file+0x485/0x5a0
> [  252.228796][  T330]  ? kernel_read_file+0x305/0x5a0
> [  252.233696][  T330]  ? __ia32_sys_fsconfig+0x6a0/0x6a0
> [  252.238841][  T330]  ? __do_sys_finit_module+0xff/0x180
> [  252.244093][  T330]  __do_sys_finit_module+0xff/0x180
> [  252.249155][  T330]  ? __do_sys_init_module+0x1d0/0x1d0
> [  252.254403][  T330]  ? __fget_files+0x1c3/0x2e0
> [  252.258940][  T330]  do_syscall_64+0x33/0x40
> [  252.263234][  T330]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
> [  252.268984][  T330] RIP: 0033:0x7f7cf6a4878d
> [  252.273276][  T330] Code: Unable to access opcode bytes at RIP
> 0x7f7cf6a48763.
> [  252.280499][  T330] RSP: 002b:00007ffcfa94b978 EFLAGS: 00000246 ORIG_RAX:
> 0000000000000139
> [  252.288781][  T330] RAX: ffffffffffffffda RBX: 000055e01f48b730 RCX:
> 00007f7cf6a4878d
> [  252.296628][  T330] RDX: 0000000000000000 RSI: 00007f7cf75ba82d RDI:
> 0000000000000006
> [  252.304482][  T330] RBP: 00007f7cf75ba82d R08: 0000000000000000 R09:
> 00007ffcfa94baa0
> [  252.312331][  T330] R10: 0000000000000006 R11: 0000000000000246 R12:
> 0000000000000000
> [  252.320167][  T330] R13: 000055e01f433530 R14: 0000000000020000 R15:
> 0000000000000000
> [  252.328052][  T330] 
> [  252.328052][  T330] Showing all locks held in the system:
> [  252.335722][  T330] 3 locks held by kworker/3:1/289:
> [  252.340697][  T330]  #0: ffff8881001eb338 ((wq_completion)events){+.+.}-
> {0:0}, at: process_one_work+0x7ec/0x1610
> [  252.350906][  T330]  #1: ffffc90004ef7e00
> ((work_completion)(&wfc.work)){+.+.}-{0:0}, at: process_one_work+0x820/0x1610
> [  252.361725][  T330]  #2: ffff88810dc600e0 (&shost->scan_mutex){+.+.}-{3:3}, 
> at: scsi_scan_host_selected+0xde/0x260
> [  252.372132][  T330] 1 lock held by khungtaskd/330:
> [  252.376933][  T330]  #0: ffffffffb42d2de0 (rcu_read_lock){....}-{1:2}, at:
> rcu_lock_acquire.constprop.52+0x0/0x30
> [  252.387234][  T330] 1 lock held by systemd-journal/398:
> [  252.392489][  T330] 1 lock held by systemd-udevd/551:
> [  252.397550][  T330]  #0: ffff888109a49218 (&dev->mutex){....}-{3:3}, at:
> device_driver_attach+0x37/0x120
> [  252.407085][  T330] 
> [  252.409285][  T330] =============================================
> [  252.409285][  T330] 
> 




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