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

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On 02/11/2020 15:18, Qian Cai wrote:
On Mon, 2020-11-02 at 14:51 +0000, John Garry wrote:
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

No. https://cailca.coding.net/public/linux/mm/git/files/master/x86.config


thanks, FWIW, I just tested another megaraid sas card on linux-next 02 Nov with vanilla arm64 defconfig and no special commandline param, and found no issue:

dmesg | grep mega
[30.031739] megasas: 07.714.04.00-rc1
[30.039749] megaraid_sas 0000:08:00.0: Adding to iommu group 0
[30.053247] megaraid_sas 0000:08:00.0: BAR:0x0 BAR's base_addr(phys):0x0000080010000000 mapped virt_addr:0x(____ptrval____)
[30.053251] megaraid_sas 0000:08:00.0: FW now in Ready state
[30.065162] megaraid_sas 0000:08:00.0: 63 bit DMA mask and 63 bit consistent mask
[30.081197] megaraid_sas 0000:08:00.0: firmware supports msix  : (128)
[30.096349] megaraid_sas 0000:08:00.0: requested/available msix 128/128
[30.110277] megaraid_sas 0000:08:00.0: current msix/online cpus: (128/128)
[30.124917] megaraid_sas 0000:08:00.0: RDPQ mode  : (enabled)
[30.136821] megaraid_sas 0000:08:00.0: Current firmware supports maximum commands: 4077 LDIO threshold: 0 [30.208538] megaraid_sas 0000:08:00.0: Performance mode :Latency (latency index = 1)
[30.224838] megaraid_sas 0000:08:00.0: FW supports sync cache  : Yes
[30.238021] megaraid_sas 0000:08:00.0: megasas_disable_intr_fusion is called outbound_intr_mask:0x40000009 [30.311960] megaraid_sas 0000:08:00.0: FW provided supportMaxExtLDs: 1 max_lds: 64
[30.327885] megaraid_sas 0000:08:00.0: controller type : MR(2048MB)
[30.341066] megaraid_sas 0000:08:00.0: Online Controller Reset(OCR) : Enabled
[30.356076] megaraid_sas 0000:08:00.0: Secure JBOD support: Yes
[30.368710] megaraid_sas 0000:08:00.0: NVMe passthru support : Yes
[30.381708] megaraid_sas 0000:08:00.0: FW provided TM TaskAbort/Reset timeout : 6 secs/60 secs
[30.399825] megaraid_sas 0000:08:00.0: JBOD sequence map support  : Yes
[30.413552] megaraid_sas 0000:08:00.0: PCI Lane Margining support : No
[30.452059] megaraid_sas 0000:08:00.0: NVME page size  : (4096)
[30.465079] megaraid_sas 0000:08:00.0: megasas_enable_intr_fusion is called outbound_intr_mask:0x40000000
[30.485208] megaraid_sas 0000:08:00.0: INIT adapter done
[30.496609] megaraid_sas 0000:08:00.0: pci id : (0x1000)/(0x0016)/(0x19e5)/(0xd215)
[30.512931] megaraid_sas 0000:08:00.0: unevenspan support : no
[30.525199] megaraid_sas 0000:08:00.0: firmware crash dump: no
[30.537649] megaraid_sas 0000:08:00.0: JBOD sequence map  : enabled
[30.550743] megaraid_sas 0000:08:00.0: Max firmware commands: 4076 shared with nr_hw_queues = 127

john@ubuntu:~$ lspci -s 08:00.0 -v
08:00.0 RAID bus controller: LSI Logic / Symbios Logic MegaRAID Tri-Mode SAS3508 (rev 01)
  Subsystem: Huawei Technologies Co., Ltd. MegaRAID Tri-Mode SAS3508
  Flags: bus master, fast devsel, latency 0, IRQ 41, NUMA node 0
  Memory at 80010000000 (64-bit, prefetchable) [size=1M]
  Memory at 80010100000 (64-bit, prefetchable) [size=1M]
  Memory at e9400000 (32-bit, non-prefetchable) [size=1M]
  I/O ports at 1000 [size=256]
  Expansion ROM at e9500000 [disabled] [size=1M]
  Capabilities: <access denied>
  Kernel driver in use: megaraid_sas

I have no x86 system to test that x86 config, though. How about v5.10-rc2 for this issue?

Thanks,
John



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]

.





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