BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 156s! INFO: task jbd2/sda1-8:2273 blocked for more than 120 seconds. Showing busy workqueues and worker pools: workqueue events: flags=0x0 Not tainted 4.17.0-rc3+ #30 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. jbd2/sda1-8 D17736 2273 2 0x80000000 pwq 0: Call Trace: context_switch kernel/sched/core.c:2848 [inline] __schedule+0x801/0x1e30 kernel/sched/core.c:3490 cpus=0 node=0 flags=0x0 nice=0 active=8/256 pending: defense_work_handler, defense_work_handler, defense_work_handler schedule+0xef/0x430 kernel/sched/core.c:3549 , defense_work_handler, vmstat_shepherd, cache_reap , defense_work_handler, switchdev_deferred_process_work workqueue events_long: flags=0x0 pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 pending: io_schedule+0x1c/0x70 kernel/sched/core.c:5169 br_fdb_cleanup workqueue events_power_efficient: flags=0x80 bit_wait_io+0x18/0x90 kernel/sched/wait_bit.c:207 __wait_on_bit+0xb3/0x130 kernel/sched/wait_bit.c:48 pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=2/256 pending: out_of_line_wait_on_bit+0x204/0x3a0 kernel/sched/wait_bit.c:63 do_cache_clean, check_lifetime workqueue mm_percpu_wq: flags=0x8 pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 pending: wait_on_bit_io include/linux/wait_bit.h:101 [inline] __wait_on_buffer+0x76/0x90 fs/buffer.c:118 vmstat_update workqueue kblockd: flags=0x18 wait_on_buffer include/linux/buffer_head.h:356 [inline] journal_wait_on_commit_record fs/jbd2/commit.c:174 [inline] jbd2_journal_commit_transaction+0x655b/0x8c18 fs/jbd2/commit.c:865 pwq 1: cpus=0 node=0 flags=0x0 nice=-20 active=2/256 pending: blk_mq_requeue_work, blk_mq_timeout_work workqueue dm_bufio_cache: flags=0x8 pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 pending: work_fn workqueue ipv6_addrconf: flags=0x40008 pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/1 pending: addrconf_verify_work kjournald2+0x26c/0xb30 fs/jbd2/journal.c:229 kthread+0x345/0x410 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 Showing all locks held in the system: 2 locks held by khungtaskd/894: #0: 000000002c9207b6 (rcu_read_lock){....}, at: check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] #0: 000000002c9207b6 (rcu_read_lock){....}, at: watchdog+0x1ff/0xf60 kernel/hung_task.c:249 #1: 0000000043c813b0 (tasklist_lock){.+.+}, at: debug_show_all_locks+0xde/0x34a kernel/locking/lockdep.c:4470 2 locks held by getty/4474: #0: 00000000ec5c755a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 0000000086796c18 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4475: #0: 00000000837e7827 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000fa666e15 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4476: #0: 000000000fc0f8a7 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000cc22faba (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4477: #0: 00000000a70eb546 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000441dbbbc (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4478: #0: 00000000cf093160 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000001d989e60 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4479: #0: 00000000df9cd846 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000c73eb3bc (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4480: #0: 00000000061651b0 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000000d544550 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 894 Comm: khungtaskd Not tainted 4.17.0-rc3+ #30 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1b9/0x294 lib/dump_stack.c:113 nmi_cpu_backtrace.cold.4+0x19/0xce lib/nmi_backtrace.c:103 nmi_trigger_cpumask_backtrace+0x151/0x192 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline] check_hung_task kernel/hung_task.c:132 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline] watchdog+0xc10/0xf60 kernel/hung_task.c:249 kthread+0x345/0x410 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 26153 Comm: syz-executor0 Not tainted 4.17.0-rc3+ #30 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:vmx_complete_atomic_exit arch/x86/kvm/vmx.c:9437 [inline] RIP: 0010:vmx_vcpu_run+0x1c82/0x25f0 arch/x86/kvm/vmx.c:9929 RSP: 0018:ffff880188f973b0 EFLAGS: 00000046 RAX: ffff8801ca890500 RBX: ffff8801ca895b90 RCX: ffffc90003cef000 RDX: 0000000000040000 RSI: ffffffff811f8594 RDI: 0000000000000005 RBP: ffff880188f97860 R08: ffff8801c8a3c540 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000080000202 R13: 0000000000000000 R14: 0000000080000202 R15: 0000000080000200 FS: 00007f3bad489700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000001bc68c000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: vcpu_run arch/x86/kvm/x86.c:7559 [inline] kvm_arch_vcpu_ioctl_run+0x33e/0x1690 arch/x86/kvm/x86.c:7736 kvm_vcpu_ioctl+0x79d/0x12e0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2560 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x1cf/0x16a0 fs/ioctl.c:684 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701 __do_sys_ioctl fs/ioctl.c:708 [inline] __se_sys_ioctl fs/ioctl.c:706 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:706 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455979 RSP: 002b:00007f3bad488c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f3bad4896d4 RCX: 0000000000455979 RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000016 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000027e R14: 00000000006f7c70 R15: 0000000000000000 Code: fe bf 00 02 00 80 e8 ce ba 59 00 41 81 ff 00 02 00 80 0f 85 93 01 00 00 e8 ac b9 59 00 48 8b 04 24 65 48 89 05 30 4b e2 7e cd 02 <48> b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 65 48 c7 05