Not sure whether the issue is a poor interaction with sd-pam and the
kernel or strictly a kernel issue.
Kernel timeout backtrace:
Sep 21 03:00:33 mainframe01 kernel: [292411.276266] Not tainted
4.15.0-1021-aws #21-Ubuntu
Sep 21 03:00:33 mainframe01 kernel: [292411.277931] "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
Sep 21 03:00:33 mainframe01 kernel: [292411.280331] kworker/u8:5 D 0
25806 2 0x80000080
Sep 21 03:00:33 mainframe01 kernel: [292411.280339] Workqueue: events_unbound
fsnotify_mark_destroy_workfn
Sep 21 03:00:33 mainframe01 kernel: [292411.280340] Call Trace:
Sep 21 03:00:33 mainframe01 kernel: [292411.280347] __schedule+0x291/0x8a0
Sep 21 03:00:33 mainframe01 kernel: [292411.280349] schedule+0x2c/0x80
Sep 21 03:00:33 mainframe01 kernel: [292411.280350]
schedule_timeout+0x1cf/0x350
Sep 21 03:00:33 mainframe01 kernel: [292411.280354] ? add_timer+0x124/0x280
Sep 21 03:00:33 mainframe01 kernel: [292411.280357]
wait_for_completion+0xba/0x140
Sep 21 03:00:33 mainframe01 kernel: [292411.280362] ? wake_up_q+0x80/0x80
Sep 21 03:00:33 mainframe01 kernel: [292411.280365]
__synchronize_srcu.part.13+0x85/0xb0
Sep 21 03:00:33 mainframe01 kernel: [292411.280367] ?
trace_raw_output_rcu_utilization+0x50/0x50
Sep 21 03:00:33 mainframe01 kernel: [292411.280369] synchronize_srcu+0x66/0xe0
Sep 21 03:00:33 mainframe01 kernel: [292411.280370] ?
synchronize_srcu+0x66/0xe0
Sep 21 03:00:33 mainframe01 kernel: [292411.280372]
fsnotify_mark_destroy_workfn+0x7b/0xe0
Sep 21 03:00:33 mainframe01 kernel: [292411.280375]
process_one_work+0x1de/0x410
Sep 21 03:00:33 mainframe01 kernel: [292411.280377] worker_thread+0x253/0x410
Sep 21 03:00:33 mainframe01 kernel: [292411.280379] kthread+0x121/0x140
Sep 21 03:00:33 mainframe01 kernel: [292411.280380] ?
process_one_work+0x410/0x410
Sep 21 03:00:33 mainframe01 kernel: [292411.280382] ?
kthread_create_worker_on_cpu+0x70/0x70
Sep 21 03:00:33 mainframe01 kernel: [292411.280385] ? do_syscall_64+0x73/0x130
Sep 21 03:00:33 mainframe01 kernel: [292411.280387] ? SyS_exit+0x17/0x20
Sep 21 03:00:33 mainframe01 kernel: [292411.280391] ret_from_fork+0x35/0x40
** Information type changed from Private Security to Public Security
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags added: bionic
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https://bugs.launchpad.net/bugs/1794169
Title:
AWS ubuntu became unreachable after ssh login
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