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[SOLVED] Uninterruptible processes w/ both linux-zen and linux-lts

A couple of days ago I started having neofetch hang on GPU detection, but today it hanged completely on me. I checked in System Monitor and it had lspci -mm process in Uninterruptible state. After a quick search, I found that the likely culprit is some kernel driver not responding to a system call indefinitely. I was using linux-zen at the time. So, I installed linux-lts, uninstalled linux-zen, updated GRUB and rebooted [reboot hanged, so I had to resort to SysRq+REISUB]. After the reboot, the problem remained, despite the kernel change from ZEN to LTS. I also searched both Artix and Arch forums, but nobody reported a similar issue.

Re: Uninterruptible processes w/ both linux-zen and linux-lts

Reply #1 –
Open a terminal and issue dmesg -wHT. In another terminal (or tab) run neofetch or lspci -nn and see if dmesg shows anything relevant.

Re: Uninterruptible processes w/ both linux-zen and linux-lts

Reply #2 –
Rund dmesg in first tab, then neofetch in the second. Waited for 10 minutes. There was no new output from dmesg. Last 2 lines from dmesg, just in case:
Code: [Select]
[Sat Oct 16 10:59:39 2021] elogind[768]: Lid opened.
[Sat Oct 16 11:00:09 2021] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
Output of uname -a, just in case:
Code: [Select]
Linux lenovo-g570 5.10.72-1-lts #1 SMP Sun, 10 Oct 2021 09:57:11 +0000 x86_64 GNU/Linux
I'm thinking about what other package could cause besides the kernel, since problem is present w/ both ZEN and LTS.

Re: Uninterruptible processes w/ both linux-zen and linux-lts

Reply #3 –
By going through the backlog of dmesg ouput, I found this:
Code: [Select]
[Fri Oct 15 16:35:47 2021] elogind[768]: New session c1 of user lightdm.
[Fri Oct 15 16:35:52 2021] elogind[768]: Removed session c1.
[Fri Oct 15 16:35:52 2021] elogind[768]: New session 1 of user alexander.
[Fri Oct 15 16:36:22 2021] [TTM] Buffer eviction failed
[Fri Oct 15 16:39:27 2021] INFO: task kworker/0:4:142 blocked for more than 122 seconds.
[Fri Oct 15 16:39:27 2021]       Not tainted 5.10.72-1-lts #1
[Fri Oct 15 16:39:27 2021] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[Fri Oct 15 16:39:27 2021] task:kworker/0:4     state:D stack:    0 pid:  142 ppid:     2 flags:0x00004000
[Fri Oct 15 16:39:27 2021] Workqueue: pm pm_runtime_work
[Fri Oct 15 16:39:27 2021] Call Trace:
[Fri Oct 15 16:39:27 2021]  __schedule+0x295/0x7f0
[Fri Oct 15 16:39:27 2021]  schedule+0x46/0xb0
[Fri Oct 15 16:39:27 2021]  schedule_timeout+0x103/0x140
[Fri Oct 15 16:39:27 2021]  radeon_fence_wait_seq_timeout+0x293/0x350 [radeon]
[Fri Oct 15 16:39:27 2021]  ? add_wait_queue_exclusive+0x70/0x70
[Fri Oct 15 16:39:27 2021]  radeon_fence_wait_empty+0x7e/0xa0 [radeon]
[Fri Oct 15 16:39:27 2021]  radeon_suspend_kms+0x1e9/0x310 [radeon]
[Fri Oct 15 16:39:27 2021]  radeon_pmops_runtime_suspend+0x43/0xb0 [radeon]
[Fri Oct 15 16:39:27 2021]  pci_pm_runtime_suspend+0x5e/0x170
[Fri Oct 15 16:39:27 2021]  ? vga_switcheroo_runtime_resume+0x60/0x60
[Fri Oct 15 16:39:27 2021]  vga_switcheroo_runtime_suspend+0x22/0xb0
[Fri Oct 15 16:39:27 2021]  ? vga_switcheroo_runtime_resume+0x60/0x60
[Fri Oct 15 16:39:27 2021]  ? vga_switcheroo_runtime_resume+0x60/0x60
[Fri Oct 15 16:39:27 2021]  __rpm_callback+0x81/0x140
[Fri Oct 15 16:39:27 2021]  ? vga_switcheroo_runtime_resume+0x60/0x60
[Fri Oct 15 16:39:27 2021]  rpm_callback+0x1f/0x70
[Fri Oct 15 16:39:27 2021]  ? vga_switcheroo_runtime_resume+0x60/0x60
[Fri Oct 15 16:39:27 2021]  rpm_suspend+0x174/0x720
[Fri Oct 15 16:39:27 2021]  pm_runtime_work+0x8e/0x90
[Fri Oct 15 16:39:27 2021]  process_one_work+0x1b6/0x350
[Fri Oct 15 16:39:27 2021]  worker_thread+0x53/0x3e0
[Fri Oct 15 16:39:27 2021]  ? process_one_work+0x350/0x350
[Fri Oct 15 16:39:27 2021]  kthread+0x11b/0x140
[Fri Oct 15 16:39:27 2021]  ? kthread_associate_blkcg+0xa0/0xa0
[Fri Oct 15 16:39:27 2021]  ret_from_fork+0x22/0x30
[Fri Oct 15 16:39:29 2021] wl: loading out-of-tree module taints kernel.
[Fri Oct 15 16:39:29 2021] wl: module license 'MIXED/Proprietary' taints kernel.
[Fri Oct 15 16:39:29 2021] Disabling lock debugging due to kernel taint
[Fri Oct 15 16:39:29 2021] wl: module verification failed: signature and/or required key missing - tainting kernel
[Fri Oct 15 16:39:29 2021] wlan0: Broadcom BCM4727 802.11 Hybrid Wireless Controller 6.30.223.271 (r587334)

[Fri Oct 15 16:39:44 2021] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[Fri Oct 15 16:41:30 2021] INFO: task kworker/0:4:142 blocked for more than 245 seconds.
[Fri Oct 15 16:41:30 2021]       Tainted: P           OE     5.10.72-1-lts #1
[Fri Oct 15 16:41:30 2021] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[Fri Oct 15 16:41:30 2021] task:kworker/0:4     state:D stack:    0 pid:  142 ppid:     2 flags:0x00004000
[Fri Oct 15 16:41:30 2021] Workqueue: pm pm_runtime_work
[Fri Oct 15 16:41:30 2021] Call Trace:
[Fri Oct 15 16:41:30 2021]  __schedule+0x295/0x7f0
[Fri Oct 15 16:41:30 2021]  schedule+0x46/0xb0
[Fri Oct 15 16:41:30 2021]  schedule_timeout+0x103/0x140
[Fri Oct 15 16:41:30 2021]  radeon_fence_wait_seq_timeout+0x293/0x350 [radeon]
[Fri Oct 15 16:41:30 2021]  ? add_wait_queue_exclusive+0x70/0x70
[Fri Oct 15 16:41:30 2021]  radeon_fence_wait_empty+0x7e/0xa0 [radeon]
[Fri Oct 15 16:41:30 2021]  radeon_suspend_kms+0x1e9/0x310 [radeon]
[Fri Oct 15 16:41:30 2021]  radeon_pmops_runtime_suspend+0x43/0xb0 [radeon]
[Fri Oct 15 16:41:30 2021]  pci_pm_runtime_suspend+0x5e/0x170
[Fri Oct 15 16:41:30 2021]  ? vga_switcheroo_runtime_resume+0x60/0x60
[Fri Oct 15 16:41:30 2021]  vga_switcheroo_runtime_suspend+0x22/0xb0
[Fri Oct 15 16:41:30 2021]  ? vga_switcheroo_runtime_resume+0x60/0x60
[Fri Oct 15 16:41:30 2021]  ? vga_switcheroo_runtime_resume+0x60/0x60
[Fri Oct 15 16:41:30 2021]  __rpm_callback+0x81/0x140
[Fri Oct 15 16:41:30 2021]  ? vga_switcheroo_runtime_resume+0x60/0x60
[Fri Oct 15 16:41:30 2021]  rpm_callback+0x1f/0x70
[Fri Oct 15 16:41:30 2021]  ? vga_switcheroo_runtime_resume+0x60/0x60
[Fri Oct 15 16:41:30 2021]  rpm_suspend+0x174/0x720
[Fri Oct 15 16:41:30 2021]  pm_runtime_work+0x8e/0x90
[Fri Oct 15 16:41:30 2021]  process_one_work+0x1b6/0x350
[Fri Oct 15 16:41:30 2021]  worker_thread+0x53/0x3e0
[Fri Oct 15 16:41:30 2021]  ? process_one_work+0x350/0x350
[Fri Oct 15 16:41:30 2021]  kthread+0x11b/0x140
[Fri Oct 15 16:41:30 2021]  ? kthread_associate_blkcg+0xa0/0xa0
[Fri Oct 15 16:41:30 2021]  ret_from_fork+0x22/0x30
[Fri Oct 15 16:43:33 2021] INFO: task kworker/0:4:142 blocked for more than 368 seconds.
[Fri Oct 15 16:43:33 2021]       Tainted: P           OE     5.10.72-1-lts #1
[Fri Oct 15 16:43:33 2021] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[Fri Oct 15 16:43:33 2021] task:kworker/0:4     state:D stack:    0 pid:  142 ppid:     2 flags:0x00004000
[Fri Oct 15 16:43:33 2021] Workqueue: pm pm_runtime_work
[Fri Oct 15 16:43:33 2021] Call Trace:
[Fri Oct 15 16:43:33 2021]  __schedule+0x295/0x7f0
[Fri Oct 15 16:43:33 2021]  schedule+0x46/0xb0
[Fri Oct 15 16:43:33 2021]  schedule_timeout+0x103/0x140
[Fri Oct 15 16:43:33 2021]  radeon_fence_wait_seq_timeout+0x293/0x350 [radeon]
[Fri Oct 15 16:43:33 2021]  ? add_wait_queue_exclusive+0x70/0x70
[Fri Oct 15 16:43:33 2021]  radeon_fence_wait_empty+0x7e/0xa0 [radeon]
[Fri Oct 15 16:43:33 2021]  radeon_suspend_kms+0x1e9/0x310 [radeon]
[Fri Oct 15 16:43:33 2021]  radeon_pmops_runtime_suspend+0x43/0xb0 [radeon]
[Fri Oct 15 16:43:33 2021]  pci_pm_runtime_suspend+0x5e/0x170
[Fri Oct 15 16:43:33 2021]  ? vga_switcheroo_runtime_resume+0x60/0x60
[Fri Oct 15 16:43:33 2021]  vga_switcheroo_runtime_suspend+0x22/0xb0
[Fri Oct 15 16:43:33 2021]  ? vga_switcheroo_runtime_resume+0x60/0x60
[Fri Oct 15 16:43:33 2021]  ? vga_switcheroo_runtime_resume+0x60/0x60
[Fri Oct 15 16:43:33 2021]  __rpm_callback+0x81/0x140
[Fri Oct 15 16:43:33 2021]  ? vga_switcheroo_runtime_resume+0x60/0x60
[Fri Oct 15 16:43:33 2021]  rpm_callback+0x1f/0x70
[Fri Oct 15 16:43:33 2021]  ? vga_switcheroo_runtime_resume+0x60/0x60
[Fri Oct 15 16:43:33 2021]  rpm_suspend+0x174/0x720
[Fri Oct 15 16:43:33 2021]  pm_runtime_work+0x8e/0x90
[Fri Oct 15 16:43:33 2021]  process_one_work+0x1b6/0x350
[Fri Oct 15 16:43:33 2021]  worker_thread+0x53/0x3e0
[Fri Oct 15 16:43:33 2021]  ? process_one_work+0x350/0x350
[Fri Oct 15 16:43:33 2021]  kthread+0x11b/0x140
[Fri Oct 15 16:43:33 2021]  ? kthread_associate_blkcg+0xa0/0xa0
[Fri Oct 15 16:43:33 2021]  ret_from_fork+0x22/0x30
[Fri Oct 15 16:44:18 2021] ptrace attach of "lspci -mm"[8868] was attempted by "cat /proc/8868/syscall"[9527]
[Fri Oct 15 16:45:36 2021] INFO: task kworker/0:4:142 blocked for more than 491 seconds.
[Fri Oct 15 16:45:36 2021]       Tainted: P           OE     5.10.72-1-lts #1
[Fri Oct 15 16:45:36 2021] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[Fri Oct 15 16:45:36 2021] task:kworker/0:4     state:D stack:    0 pid:  142 ppid:     2 flags:0x00004000
[Fri Oct 15 16:45:36 2021] Workqueue: pm pm_runtime_work
[Fri Oct 15 16:45:36 2021] Call Trace:
[Fri Oct 15 16:45:36 2021]  __schedule+0x295/0x7f0
[Fri Oct 15 16:45:36 2021]  schedule+0x46/0xb0
[Fri Oct 15 16:45:36 2021]  schedule_timeout+0x103/0x140
[Fri Oct 15 16:45:36 2021]  radeon_fence_wait_seq_timeout+0x293/0x350 [radeon]
[Fri Oct 15 16:45:36 2021]  ? add_wait_queue_exclusive+0x70/0x70
[Fri Oct 15 16:45:36 2021]  radeon_fence_wait_empty+0x7e/0xa0 [radeon]
[Fri Oct 15 16:45:36 2021]  radeon_suspend_kms+0x1e9/0x310 [radeon]
[Fri Oct 15 16:45:36 2021]  radeon_pmops_runtime_suspend+0x43/0xb0 [radeon]
[Fri Oct 15 16:45:36 2021]  pci_pm_runtime_suspend+0x5e/0x170
[Fri Oct 15 16:45:36 2021]  ? vga_switcheroo_runtime_resume+0x60/0x60
[Fri Oct 15 16:45:36 2021]  vga_switcheroo_runtime_suspend+0x22/0xb0
[Fri Oct 15 16:45:36 2021]  ? vga_switcheroo_runtime_resume+0x60/0x60
[Fri Oct 15 16:45:36 2021]  ? vga_switcheroo_runtime_resume+0x60/0x60
[Fri Oct 15 16:45:36 2021]  __rpm_callback+0x81/0x140
[Fri Oct 15 16:45:36 2021]  ? vga_switcheroo_runtime_resume+0x60/0x60
[Fri Oct 15 16:45:36 2021]  rpm_callback+0x1f/0x70
[Fri Oct 15 16:45:36 2021]  ? vga_switcheroo_runtime_resume+0x60/0x60
[Fri Oct 15 16:45:36 2021]  rpm_suspend+0x174/0x720
[Fri Oct 15 16:45:36 2021]  pm_runtime_work+0x8e/0x90
[Fri Oct 15 16:45:36 2021]  process_one_work+0x1b6/0x350
[Fri Oct 15 16:45:36 2021]  worker_thread+0x53/0x3e0
[Fri Oct 15 16:45:36 2021]  ? process_one_work+0x350/0x350
[Fri Oct 15 16:45:36 2021]  kthread+0x11b/0x140
[Fri Oct 15 16:45:36 2021]  ? kthread_associate_blkcg+0xa0/0xa0
[Fri Oct 15 16:45:36 2021]  ret_from_fork+0x22/0x30
[Fri Oct 15 16:45:36 2021] INFO: task lspci:8868 blocked for more than 122 seconds.
[Fri Oct 15 16:45:36 2021]       Tainted: P           OE     5.10.72-1-lts #1
[Fri Oct 15 16:45:36 2021] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[Fri Oct 15 16:45:36 2021] task:lspci           state:D stack:    0 pid: 8868 ppid:  8867 flags:0x00000000
[Fri Oct 15 16:45:36 2021] Call Trace:
[Fri Oct 15 16:45:36 2021]  __schedule+0x295/0x7f0
[Fri Oct 15 16:45:36 2021]  schedule+0x46/0xb0
[Fri Oct 15 16:45:36 2021]  __pm_runtime_barrier+0xd6/0x1a0
[Fri Oct 15 16:45:36 2021]  ? add_wait_queue_exclusive+0x70/0x70
[Fri Oct 15 16:45:36 2021]  pm_runtime_barrier+0x48/0x90
[Fri Oct 15 16:45:36 2021]  pci_config_pm_runtime_get+0x36/0x50
[Fri Oct 15 16:45:36 2021]  pci_read_config+0xac/0x270
[Fri Oct 15 16:45:36 2021]  ? kernfs_fop_read_iter+0x11b/0x1a0
[Fri Oct 15 16:45:36 2021]  kernfs_fop_read_iter+0xa6/0x1a0
[Fri Oct 15 16:45:36 2021]  new_sync_read+0x152/0x1e0
[Fri Oct 15 16:45:36 2021]  vfs_read+0x147/0x1a0
[Fri Oct 15 16:45:36 2021]  __x64_sys_pread64+0x8c/0xc0
[Fri Oct 15 16:45:36 2021]  do_syscall_64+0x33/0x40
[Fri Oct 15 16:45:36 2021]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[Fri Oct 15 16:45:36 2021] RIP: 0033:0x7f343f0ff27a
[Fri Oct 15 16:45:36 2021] RSP: 002b:00007fffd4490a28 EFLAGS: 00000246 ORIG_RAX: 0000000000000011
[Fri Oct 15 16:45:36 2021] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f343f0ff27a
[Fri Oct 15 16:45:36 2021] RDX: 0000000000000040 RSI: 0000556360a23c00 RDI: 0000000000000003
[Fri Oct 15 16:45:36 2021] RBP: 0000000000000040 R08: 00007f343f197040 R09: 00007fffd4490400
[Fri Oct 15 16:45:36 2021] R10: 0000000000000000 R11: 0000000000000246 R12: 0000556360a2bbf0
[Fri Oct 15 16:45:36 2021] R13: 0000556360a23c00 R14: 0000000000000000 R15: 0000000000000000
[Fri Oct 15 16:47:39 2021] INFO: task kworker/0:4:142 blocked for more than 614 seconds.
[Fri Oct 15 16:47:39 2021]       Tainted: P           OE     5.10.72-1-lts #1
[Fri Oct 15 16:47:39 2021] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[Fri Oct 15 16:47:39 2021] task:kworker/0:4     state:D stack:    0 pid:  142 ppid:     2 flags:0x00004000
[Fri Oct 15 16:47:39 2021] Workqueue: pm pm_runtime_work
[Fri Oct 15 16:47:39 2021] Call Trace:
[Fri Oct 15 16:47:39 2021]  __schedule+0x295/0x7f0
[Fri Oct 15 16:47:39 2021]  schedule+0x46/0xb0
[Fri Oct 15 16:47:39 2021]  schedule_timeout+0x103/0x140
[Fri Oct 15 16:47:39 2021]  radeon_fence_wait_seq_timeout+0x293/0x350 [radeon]
[Fri Oct 15 16:47:39 2021]  ? add_wait_queue_exclusive+0x70/0x70
[Fri Oct 15 16:47:39 2021]  radeon_fence_wait_empty+0x7e/0xa0 [radeon]
[Fri Oct 15 16:47:39 2021]  radeon_suspend_kms+0x1e9/0x310 [radeon]
[Fri Oct 15 16:47:39 2021]  radeon_pmops_runtime_suspend+0x43/0xb0 [radeon]
[Fri Oct 15 16:47:39 2021]  pci_pm_runtime_suspend+0x5e/0x170
[Fri Oct 15 16:47:39 2021]  ? vga_switcheroo_runtime_resume+0x60/0x60
[Fri Oct 15 16:47:39 2021]  vga_switcheroo_runtime_suspend+0x22/0xb0
[Fri Oct 15 16:47:39 2021]  ? vga_switcheroo_runtime_resume+0x60/0x60
[Fri Oct 15 16:47:39 2021]  ? vga_switcheroo_runtime_resume+0x60/0x60
[Fri Oct 15 16:47:39 2021]  __rpm_callback+0x81/0x140
[Fri Oct 15 16:47:39 2021]  ? vga_switcheroo_runtime_resume+0x60/0x60
[Fri Oct 15 16:47:39 2021]  rpm_callback+0x1f/0x70
[Fri Oct 15 16:47:39 2021]  ? vga_switcheroo_runtime_resume+0x60/0x60
[Fri Oct 15 16:47:39 2021]  rpm_suspend+0x174/0x720
[Fri Oct 15 16:47:39 2021]  pm_runtime_work+0x8e/0x90
[Fri Oct 15 16:47:39 2021]  process_one_work+0x1b6/0x350
[Fri Oct 15 16:47:39 2021]  worker_thread+0x53/0x3e0
[Fri Oct 15 16:47:39 2021]  ? process_one_work+0x350/0x350
[Fri Oct 15 16:47:39 2021]  kthread+0x11b/0x140
[Fri Oct 15 16:47:39 2021]  ? kthread_associate_blkcg+0xa0/0xa0
[Fri Oct 15 16:47:39 2021]  ret_from_fork+0x22/0x30
[Fri Oct 15 16:47:39 2021] INFO: task lspci:8868 blocked for more than 245 seconds.
[Fri Oct 15 16:47:39 2021]       Tainted: P           OE     5.10.72-1-lts #1
[Fri Oct 15 16:47:39 2021] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[Fri Oct 15 16:47:39 2021] task:lspci           state:D stack:    0 pid: 8868 ppid:  8867 flags:0x00000000
[Fri Oct 15 16:47:39 2021] Call Trace:
[Fri Oct 15 16:47:39 2021]  __schedule+0x295/0x7f0
[Fri Oct 15 16:47:39 2021]  schedule+0x46/0xb0
[Fri Oct 15 16:47:39 2021]  __pm_runtime_barrier+0xd6/0x1a0
[Fri Oct 15 16:47:39 2021]  ? add_wait_queue_exclusive+0x70/0x70
[Fri Oct 15 16:47:39 2021]  pm_runtime_barrier+0x48/0x90
[Fri Oct 15 16:47:39 2021]  pci_config_pm_runtime_get+0x36/0x50
[Fri Oct 15 16:47:39 2021]  pci_read_config+0xac/0x270
[Fri Oct 15 16:47:39 2021]  ? kernfs_fop_read_iter+0x11b/0x1a0
[Fri Oct 15 16:47:39 2021]  kernfs_fop_read_iter+0xa6/0x1a0
[Fri Oct 15 16:47:39 2021]  new_sync_read+0x152/0x1e0
[Fri Oct 15 16:47:39 2021]  vfs_read+0x147/0x1a0
[Fri Oct 15 16:47:39 2021]  __x64_sys_pread64+0x8c/0xc0
[Fri Oct 15 16:47:39 2021]  do_syscall_64+0x33/0x40
[Fri Oct 15 16:47:39 2021]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[Fri Oct 15 16:47:39 2021] RIP: 0033:0x7f343f0ff27a
[Fri Oct 15 16:47:39 2021] RSP: 002b:00007fffd4490a28 EFLAGS: 00000246 ORIG_RAX: 0000000000000011
[Fri Oct 15 16:47:39 2021] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f343f0ff27a
[Fri Oct 15 16:47:39 2021] RDX: 0000000000000040 RSI: 0000556360a23c00 RDI: 0000000000000003
[Fri Oct 15 16:47:39 2021] RBP: 0000000000000040 R08: 00007f343f197040 R09: 00007fffd4490400
[Fri Oct 15 16:47:39 2021] R10: 0000000000000000 R11: 0000000000000246 R12: 0000556360a2bbf0
[Fri Oct 15 16:47:39 2021] R13: 0000556360a23c00 R14: 0000000000000000 R15: 0000000000000000
[Fri Oct 15 16:49:42 2021] INFO: task kworker/0:4:142 blocked for more than 737 seconds.
[Fri Oct 15 16:49:42 2021]       Tainted: P           OE     5.10.72-1-lts #1
[Fri Oct 15 16:49:42 2021] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[Fri Oct 15 16:49:42 2021] task:kworker/0:4     state:D stack:    0 pid:  142 ppid:     2 flags:0x00004000
[Fri Oct 15 16:49:42 2021] Workqueue: pm pm_runtime_work
[Fri Oct 15 16:49:42 2021] Call Trace:
[Fri Oct 15 16:49:42 2021]  __schedule+0x295/0x7f0
[Fri Oct 15 16:49:42 2021]  schedule+0x46/0xb0
[Fri Oct 15 16:49:42 2021]  schedule_timeout+0x103/0x140
[Fri Oct 15 16:49:42 2021]  radeon_fence_wait_seq_timeout+0x293/0x350 [radeon]
[Fri Oct 15 16:49:42 2021]  ? add_wait_queue_exclusive+0x70/0x70
[Fri Oct 15 16:49:42 2021]  radeon_fence_wait_empty+0x7e/0xa0 [radeon]
[Fri Oct 15 16:49:42 2021]  radeon_suspend_kms+0x1e9/0x310 [radeon]
[Fri Oct 15 16:49:42 2021]  radeon_pmops_runtime_suspend+0x43/0xb0 [radeon]
[Fri Oct 15 16:49:42 2021]  pci_pm_runtime_suspend+0x5e/0x170
[Fri Oct 15 16:49:42 2021]  ? vga_switcheroo_runtime_resume+0x60/0x60
[Fri Oct 15 16:49:42 2021]  vga_switcheroo_runtime_suspend+0x22/0xb0
[Fri Oct 15 16:49:42 2021]  ? vga_switcheroo_runtime_resume+0x60/0x60
[Fri Oct 15 16:49:42 2021]  ? vga_switcheroo_runtime_resume+0x60/0x60
[Fri Oct 15 16:49:42 2021]  __rpm_callback+0x81/0x140
[Fri Oct 15 16:49:42 2021]  ? vga_switcheroo_runtime_resume+0x60/0x60
[Fri Oct 15 16:49:42 2021]  rpm_callback+0x1f/0x70
[Fri Oct 15 16:49:42 2021]  ? vga_switcheroo_runtime_resume+0x60/0x60
[Fri Oct 15 16:49:42 2021]  rpm_suspend+0x174/0x720
[Fri Oct 15 16:49:42 2021]  pm_runtime_work+0x8e/0x90
[Fri Oct 15 16:49:42 2021]  process_one_work+0x1b6/0x350
[Fri Oct 15 16:49:42 2021]  worker_thread+0x53/0x3e0
[Fri Oct 15 16:49:42 2021]  ? process_one_work+0x350/0x350
[Fri Oct 15 16:49:42 2021]  kthread+0x11b/0x140
[Fri Oct 15 16:49:42 2021]  ? kthread_associate_blkcg+0xa0/0xa0
[Fri Oct 15 16:49:42 2021]  ret_from_fork+0x22/0x30
[Fri Oct 15 16:49:42 2021] INFO: task lspci:8868 blocked for more than 368 seconds.
[Fri Oct 15 16:49:42 2021]       Tainted: P           OE     5.10.72-1-lts #1
[Fri Oct 15 16:49:42 2021] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[Fri Oct 15 16:49:42 2021] task:lspci           state:D stack:    0 pid: 8868 ppid:  8867 flags:0x00000000
[Fri Oct 15 16:49:42 2021] Call Trace:
[Fri Oct 15 16:49:42 2021]  __schedule+0x295/0x7f0
[Fri Oct 15 16:49:42 2021]  schedule+0x46/0xb0
[Fri Oct 15 16:49:42 2021]  __pm_runtime_barrier+0xd6/0x1a0
[Fri Oct 15 16:49:42 2021]  ? add_wait_queue_exclusive+0x70/0x70
[Fri Oct 15 16:49:42 2021]  pm_runtime_barrier+0x48/0x90
[Fri Oct 15 16:49:42 2021]  pci_config_pm_runtime_get+0x36/0x50
[Fri Oct 15 16:49:42 2021]  pci_read_config+0xac/0x270
[Fri Oct 15 16:49:42 2021]  ? kernfs_fop_read_iter+0x11b/0x1a0
[Fri Oct 15 16:49:42 2021]  kernfs_fop_read_iter+0xa6/0x1a0
[Fri Oct 15 16:49:42 2021]  new_sync_read+0x152/0x1e0
[Fri Oct 15 16:49:42 2021]  vfs_read+0x147/0x1a0
[Fri Oct 15 16:49:42 2021]  __x64_sys_pread64+0x8c/0xc0
[Fri Oct 15 16:49:42 2021]  do_syscall_64+0x33/0x40
[Fri Oct 15 16:49:42 2021]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[Fri Oct 15 16:49:42 2021] RIP: 0033:0x7f343f0ff27a
[Fri Oct 15 16:49:42 2021] RSP: 002b:00007fffd4490a28 EFLAGS: 00000246 ORIG_RAX: 0000000000000011
[Fri Oct 15 16:49:42 2021] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f343f0ff27a
[Fri Oct 15 16:49:42 2021] RDX: 0000000000000040 RSI: 0000556360a23c00 RDI: 0000000000000003
[Fri Oct 15 16:49:42 2021] RBP: 0000000000000040 R08: 00007f343f197040 R09: 00007fffd4490400
[Fri Oct 15 16:49:42 2021] R10: 0000000000000000 R11: 0000000000000246 R12: 0000556360a2bbf0
[Fri Oct 15 16:49:42 2021] R13: 0000556360a23c00 R14: 0000000000000000 R15: 0000000000000000
[Fri Oct 15 16:50:57 2021] Adding 4194300k swap on /home/swapfile.  Priority:-2 extents:178 across:180440384k SSDscFS
[Fri Oct 15 16:51:45 2021] INFO: task kworker/0:4:142 blocked for more than 860 seconds.
[Fri Oct 15 16:51:45 2021]       Tainted: P           OE     5.10.72-1-lts #1
[Fri Oct 15 16:51:45 2021] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[Fri Oct 15 16:51:45 2021] task:kworker/0:4     state:D stack:    0 pid:  142 ppid:     2 flags:0x00004000
[Fri Oct 15 16:51:45 2021] Workqueue: pm pm_runtime_work
[Fri Oct 15 16:51:45 2021] Call Trace:
[Fri Oct 15 16:51:45 2021]  __schedule+0x295/0x7f0
[Fri Oct 15 16:51:45 2021]  schedule+0x46/0xb0
[Fri Oct 15 16:51:45 2021]  schedule_timeout+0x103/0x140
[Fri Oct 15 16:51:45 2021]  radeon_fence_wait_seq_timeout+0x293/0x350 [radeon]
[Fri Oct 15 16:51:45 2021]  ? add_wait_queue_exclusive+0x70/0x70
[Fri Oct 15 16:51:45 2021]  radeon_fence_wait_empty+0x7e/0xa0 [radeon]
[Fri Oct 15 16:51:45 2021]  radeon_suspend_kms+0x1e9/0x310 [radeon]
[Fri Oct 15 16:51:45 2021]  radeon_pmops_runtime_suspend+0x43/0xb0 [radeon]
[Fri Oct 15 16:51:45 2021]  pci_pm_runtime_suspend+0x5e/0x170
[Fri Oct 15 16:51:45 2021]  ? vga_switcheroo_runtime_resume+0x60/0x60
[Fri Oct 15 16:51:45 2021]  vga_switcheroo_runtime_suspend+0x22/0xb0
[Fri Oct 15 16:51:45 2021]  ? vga_switcheroo_runtime_resume+0x60/0x60
[Fri Oct 15 16:51:45 2021]  ? vga_switcheroo_runtime_resume+0x60/0x60
[Fri Oct 15 16:51:45 2021]  __rpm_callback+0x81/0x140
[Fri Oct 15 16:51:45 2021]  ? vga_switcheroo_runtime_resume+0x60/0x60
[Fri Oct 15 16:51:45 2021]  rpm_callback+0x1f/0x70
[Fri Oct 15 16:51:45 2021]  ? vga_switcheroo_runtime_resume+0x60/0x60
[Fri Oct 15 16:51:45 2021]  rpm_suspend+0x174/0x720
[Fri Oct 15 16:51:45 2021]  pm_runtime_work+0x8e/0x90
[Fri Oct 15 16:51:45 2021]  process_one_work+0x1b6/0x350
[Fri Oct 15 16:51:45 2021]  worker_thread+0x53/0x3e0
[Fri Oct 15 16:51:45 2021]  ? process_one_work+0x350/0x350
[Fri Oct 15 16:51:45 2021]  kthread+0x11b/0x140
[Fri Oct 15 16:51:45 2021]  ? kthread_associate_blkcg+0xa0/0xa0
[Fri Oct 15 16:51:45 2021]  ret_from_fork+0x22/0x30
Now, taint comes from broadcom-wl-dkms, which I had to install after switching to LTS kernel, since brcmsmac module is causing kernel panics on LTS, but I could repeat after switching to ZEN and uninstalling proprietary module.

Re: Uninterruptible processes w/ both linux-zen and linux-lts

Reply #4 –
By the looks of it, radeon module is the culprit. I'll blacklist it and reboot, see if that solves the issue.
 

Re: Uninterruptible processes w/ both linux-zen and linux-lts

Reply #5 –
Blacklisting radeon module solved the issue.