This bug looks similar/related to: https://github.com/systemd/systemd/issues/10123 https://www.spinics.net/lists/linux-fsdevel/msg132837.html
I've attached my hung tasks (sysrq w). ** Bug watch added: github.com/systemd/systemd/issues #10123 https://github.com/systemd/systemd/issues/10123 ** Attachment added: "hung_tasks" https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1798212/+attachment/5258942/+files/hung_tasks -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1798212 Title: systemd stuck in uninterruptible sleep state Status in systemd package in Ubuntu: Confirmed Bug description: Ubuntu 16.04 systemd 229 may get stuck in an uninterruptible sleep state. Any subsequent systemctl command times out with "Failed to execute operation: Connection timed out" error message. gdb and strace is unable to attach to systemd process 1. $ systemd --version systemd 229 +PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ -LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD -IDN $ cat /proc/1/stack [<0>] flush_work+0x129/0x1e0 [<0>] flush_delayed_work+0x3f/0x50 [<0>] fsnotify_wait_marks_destroyed+0x15/0x20 [<0>] fsnotify_destroy_group+0x48/0xd0 [<0>] inotify_release+0x1e/0x50 [<0>] __fput+0xea/0x220 [<0>] ____fput+0xe/0x10 [<0>] task_work_run+0x8a/0xb0 [<0>] exit_to_usermode_loop+0xc4/0xd0 [<0>] do_syscall_64+0xf4/0x130 [<0>] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [<0>] 0xffffffffffffffff $ cat /proc/1/status Name: systemd Umask: 0000 State: D (disk sleep) Tgid: 1 Ngid: 0 Pid: 1 PPid: 0 TracerPid: 9724 Uid: 0 0 0 0 Gid: 0 0 0 0 FDSize: 128 Groups: NStgid: 1 NSpid: 1 NSpgid: 1 NSsid: 1 VmPeak: 251136 kB VmSize: 185728 kB VmLck: 0 kB VmPin: 0 kB VmHWM: 6620 kB VmRSS: 6264 kB RssAnon: 2380 kB RssFile: 3884 kB RssShmem: 0 kB VmData: 18752 kB VmStk: 132 kB VmExe: 1392 kB VmLib: 3692 kB VmPTE: 128 kB VmSwap: 0 kB HugetlbPages: 0 kB CoreDumping: 0 Threads: 1 SigQ: 1/257098 SigPnd: 0000000000040000 ShdPnd: 0000000000010000 SigBlk: 7be3c0fe28014a03 SigIgn: 0000000000001000 SigCgt: 00000001800004ec CapInh: 0000000000000000 CapPrm: 0000003fffffffff CapEff: 0000003fffffffff CapBnd: 0000003fffffffff CapAmb: 0000000000000000 NoNewPrivs: 0 Seccomp: 0 Speculation_Store_Bypass: vulnerable Cpus_allowed: ffffffff Cpus_allowed_list: 0-31 Mems_allowed: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000003 Mems_allowed_list: 0-1 voluntary_ctxt_switches: 716968 nonvoluntary_ctxt_switches: 9565 $ dmesg [...] [1255076.993707] INFO: task systemd:1 blocked for more than 120 seconds. [1255077.000295] Not tainted 4.15.0-32-generic #35~16.04.1-Ubuntu [1255077.006804] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [1255077.014996] systemd D 0 1 0 0x00000000 [1255077.015000] Call Trace: [1255077.015011] __schedule+0x3d6/0x8b0 [1255077.015019] ? enqueue_entity+0x112/0x670 [1255077.015021] schedule+0x36/0x80 [1255077.015025] schedule_timeout+0x1db/0x370 [1255077.015028] ? check_preempt_curr+0x54/0x90 [1255077.015030] ? ttwu_do_wakeup+0x1e/0x150 [1255077.015033] wait_for_completion+0xb4/0x140 [1255077.015035] ? wake_up_q+0x70/0x70 [1255077.015040] flush_work+0x129/0x1e0 [1255077.015043] ? worker_detach_from_pool+0xb0/0xb0 [1255077.015045] flush_delayed_work+0x3f/0x50 [1255077.015052] fsnotify_wait_marks_destroyed+0x15/0x20 [1255077.015055] fsnotify_destroy_group+0x48/0xd0 [1255077.015058] inotify_release+0x1e/0x50 [1255077.015063] __fput+0xea/0x220 [1255077.015065] ____fput+0xe/0x10 [1255077.015068] task_work_run+0x8a/0xb0 [1255077.015074] exit_to_usermode_loop+0xc4/0xd0 [1255077.015077] do_syscall_64+0xf4/0x130 [1255077.015080] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [1255077.015084] RIP: 0033:0x7f29c9c3457d [1255077.015085] RSP: 002b:00007ffec956fe30 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [1255077.015088] RAX: 0000000000000000 RBX: 0000000000000010 RCX: 00007f29c9c3457d [1255077.015090] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000010 [1255077.015092] RBP: 00007f29cb36d700 R08: 00005625f0043420 R09: 0000000000000001 [1255077.015093] R10: 0000000000000000 R11: 0000000000000293 R12: 000000000000000b [1255077.015095] R13: 00005625eeed6040 R14: 00005625eff179b8 R15: 00005625eeed7460 [1255077.015421] INFO: task kworker/u66:2:108669 blocked for more than 120 seconds. [1255077.022960] Not tainted 4.15.0-32-generic #35~16.04.1-Ubuntu [1255077.029469] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [1255077.037601] kworker/u66:2 D 0 108669 2 0x80000080 [1255077.037613] Workqueue: events_unbound fsnotify_mark_destroy_workfn [1255077.037615] Call Trace: [1255077.037621] __schedule+0x3d6/0x8b0 [1255077.037627] ? __update_load_avg_blocked_se.isra.37+0xc5/0x140 [1255077.037629] schedule+0x36/0x80 [1255077.037633] schedule_timeout+0x1db/0x370 [1255077.037636] ? add_timer+0x125/0x280 [1255077.037639] wait_for_completion+0xb4/0x140 [1255077.037641] ? wake_up_q+0x70/0x70 [1255077.037646] __synchronize_srcu.part.13+0x85/0xb0 [1255077.037650] ? trace_raw_output_rcu_utilization+0x50/0x50 [1255077.037653] synchronize_srcu+0xd3/0xe0 [1255077.037656] ? synchronize_srcu+0xd3/0xe0 [1255077.037660] fsnotify_mark_destroy_workfn+0x7c/0xe0 [1255077.037664] process_one_work+0x14d/0x410 [1255077.037678] worker_thread+0x22b/0x460 [1255077.037682] kthread+0x105/0x140 [1255077.037691] ? process_one_work+0x410/0x410 [1255077.037701] ? kthread_destroy_worker+0x50/0x50 [1255077.037712] ret_from_fork+0x35/0x40 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1798212/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
