Comment 0 for bug 1856511

1) Ubuntu 19.10
2) iwconfig Wireless-Tools version 30
3) Suspend system with task freeze.
4) Task froze when system was suspended.

Dec 15 10:21:00 htpc-GA-MA780G-UD3H kernel: [43132.514342] PM: suspend entry (deep)
Dec 15 10:21:00 htpc-GA-MA780G-UD3H kernel: [43132.883332] Filesystems sync: 0.368 seconds
Dec 15 10:21:20 htpc-GA-MA780G-UD3H kernel: [43132.939352] Freezing user space processes ...
Dec 15 10:21:20 htpc-GA-MA780G-UD3H kernel: [43152.948498] Freezing of tasks failed after 20.009 seconds (1 tasks refusing to freeze, wq_busy=0):
Dec 15 10:21:20 htpc-GA-MA780G-UD3H kernel: [43152.948984] iwconfig D 0 18556 18555 0x00004004
Dec 15 10:21:20 htpc-GA-MA780G-UD3H kernel: [43152.948986] Call Trace:
Dec 15 10:21:20 htpc-GA-MA780G-UD3H kernel: [43152.948992] __schedule+0x2b9/0x6c0
Dec 15 10:21:20 htpc-GA-MA780G-UD3H kernel: [43152.948994] schedule+0x42/0xb0
Dec 15 10:21:20 htpc-GA-MA780G-UD3H kernel: [43152.948996] fanotify_handle_event+0x2fb/0x45e
Dec 15 10:21:20 htpc-GA-MA780G-UD3H kernel: [43152.948998] ? wait_woken+0x80/0x80
Dec 15 10:21:20 htpc-GA-MA780G-UD3H kernel: [43152.949000] fsnotify+0x29d/0x3d0
Dec 15 10:21:20 htpc-GA-MA780G-UD3H kernel: [43152.949003] security_file_open+0xa2/0xe0
Dec 15 10:21:20 htpc-GA-MA780G-UD3H kernel: [43152.949004] do_dentry_open+0xdf/0x3a0
Dec 15 10:21:20 htpc-GA-MA780G-UD3H kernel: [43152.949006] vfs_open+0x2d/0x30
Dec 15 10:21:20 htpc-GA-MA780G-UD3H kernel: [43152.949007] do_last+0x185/0x930
Dec 15 10:21:20 htpc-GA-MA780G-UD3H kernel: [43152.949009] path_openat+0x8d/0x270
Dec 15 10:21:20 htpc-GA-MA780G-UD3H kernel: [43152.949010] do_filp_open+0x91/0x100
Dec 15 10:21:20 htpc-GA-MA780G-UD3H kernel: [43152.949013] ? __alloc_fd+0x46/0x150
Dec 15 10:21:20 htpc-GA-MA780G-UD3H kernel: [43152.949014] do_sys_open+0x17e/0x290
Dec 15 10:21:20 htpc-GA-MA780G-UD3H kernel: [43152.949016] __x64_sys_openat+0x20/0x30
Dec 15 10:21:20 htpc-GA-MA780G-UD3H kernel: [43152.949018] do_syscall_64+0x5a/0x130
Dec 15 10:21:20 htpc-GA-MA780G-UD3H kernel: [43152.949020] entry_SYSCALL_64_after_hwframe+0x44/0xa9
Dec 15 10:21:20 htpc-GA-MA780G-UD3H kernel: [43152.949022] RIP: 0033:0x7f64f98d1d08
Dec 15 10:21:20 htpc-GA-MA780G-UD3H kernel: [43152.949025] Code: Bad RIP value.
Dec 15 10:21:20 htpc-GA-MA780G-UD3H kernel: [43152.949026] RSP: 002b:00007ffe70914968 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
Dec 15 10:21:20 htpc-GA-MA780G-UD3H kernel: [43152.949028] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f64f98d1d08
Dec 15 10:21:20 htpc-GA-MA780G-UD3H kernel: [43152.949028] RDX: 0000000000080000 RSI: 00007f64f98e2df0 RDI: 00000000ffffff9c
Dec 15 10:21:20 htpc-GA-MA780G-UD3H kernel: [43152.949029] RBP: 00007ffe709149d0 R08: 0000000000080000 R09: 00007f64f98e2df0
Dec 15 10:21:20 htpc-GA-MA780G-UD3H kernel: [43152.949030] R10: 0000000000000000 R11: 0000000000000287 R12: 00007f64f98e2df0
Dec 15 10:21:20 htpc-GA-MA780G-UD3H kernel: [43152.949030] R13: 000055f345e92839 R14: 00007ffe70914a40 R15: 00007ffe70914a40
Dec 15 10:21:20 htpc-GA-MA780G-UD3H kernel: [43152.949032] OOM killer enabled.
Dec 15 10:21:20 htpc-GA-MA780G-UD3H kernel: [43152.949033] Restarting tasks ... done.
Dec 15 10:21:20 htpc-GA-MA780G-UD3H kernel: [43152.953953] PM: suspend exit