INIT: Id "5" respawning too fast: disabled for 5 minutes INIT: Id "1" respawning too fast: disabled for 5 minutes INIT: Id "4" respawning too fast: disabled for 5 minutes INIT: Id "3" respawning too fast: disabled for 5 minutes INIT: Id "2" respawning too fast: disabled for 5 minutes Warning: Permanently added '10.128.0.61' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program INIT: Id "6" respawning too fast: disabled for 5 minutes INIT: Id "2" respawning too fast: disabled for 5 minutes INIT: Id "4" respawning too fast: disabled for 5 minutes INIT: Id "5" respawning too fast: disabled for 5 minutes INIT: Id "1" respawning too fast: disabled for 5 minutes INIT: Id "3" respawning too fast: disabled for 5 minutes [ 613.588836] INFO: task syz-executor903:3768 blocked for more than 120 seconds. [ 613.596213] Not tainted 4.9.109-ge1815b3 #52 [ 613.601165] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 613.609303] syz-executor903 D27176 3768 3766 0x00000000 [ 613.615088] ffff8801d8031800 ffff8801d8dab480 ffff8801d944b9c0 ffff8801bfb2c800 [ 613.623100] ffff8801db321c18 ffff8801d7ccf9f0 ffffffff839e8a8d 0000000000000002 [ 613.631111] 0000000041b58ab3 ffffffff843b9d9b 00ffffff81221500 ffff8801db3224e8 [ 613.639148] Call Trace: [ 613.641779] [] ? __schedule+0x64d/0x1bd0 [ 613.647465] [] schedule+0x7f/0x1b0 [ 613.652717] [] blk_mq_freeze_queue_wait+0x114/0x230 [ 613.659404] [] ? plug_ctx_cmp+0x100/0x100 [ 613.665225] [] ? prepare_to_wait_event+0x450/0x450 [ 613.671834] [] blk_mq_freeze_queue+0x1d/0x20 [ 613.678464] [] lo_ioctl+0x722/0x1aa0 [ 613.683931] [] ? loop_lookup.part.19+0x110/0x110 [ 613.690326] [] blkdev_ioctl+0x7b6/0x1a70 [ 613.696010] [] ? blkpg_ioctl+0x920/0x920 [ 613.701773] [] ? do_readv_writev+0x1fe/0x7a0 [ 613.707816] [] ? vfs_write+0x530/0x530 [ 613.713406] [] block_ioctl+0xde/0x120 [ 613.718852] [] ? blkdev_fallocate+0x440/0x440 [ 613.724983] [] do_vfs_ioctl+0x1ac/0x11a0 [ 613.730686] [] ? ioctl_preallocate+0x220/0x220 [ 613.736988] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 613.743944] [] ? selinux_capable+0x40/0x40 [ 613.749819] [] ? vfs_writev+0x8f/0xc0 [ 613.755239] [] ? do_pwritev+0x13e/0x240 [ 613.760869] [] ? security_file_ioctl+0x8f/0xc0 [ 613.767071] [] SyS_ioctl+0x8f/0xc0 [ 613.772246] [] ? do_vfs_ioctl+0x11a0/0x11a0 [ 613.778204] [] do_syscall_64+0x1a6/0x490 [ 613.783903] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 613.790809] [ 613.790809] Showing all locks held in the system: [ 613.797101] 2 locks held by khungtaskd/519: [ 613.801404] #0: (rcu_read_lock){......}, at: [] watchdog+0x11c/0xa20 [ 613.810133] #1: (tasklist_lock){.+.+..}, at: [] debug_show_all_locks+0x79/0x218 [ 613.819826] 2 locks held by getty/3666: [ 613.823772] #0: (&tty->ldisc_sem){++++++}, at: [] ldsem_down_read+0x32/0x40 [ 613.833080] #1: (&ldata->atomic_read_lock){+.+...}, at: [] n_tty_read+0x202/0x16e0 [ 613.843026] 1 lock held by syz-executor903/3768: [ 613.847752] #0: (&lo->lo_ctl_mutex/1){+.+.+.}, at: [] lo_ioctl+0x8b/0x1aa0 [ 613.857092] [ 613.858706] ============================================= [ 613.858706] [ 613.865742] NMI backtrace for cpu 1 [ 613.869385] CPU: 1 PID: 519 Comm: khungtaskd Not tainted 4.9.109-ge1815b3 #52 [ 613.876629] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 613.885955] ffff8801d86a7d08 ffffffff81eb3e29 0000000000000000 0000000000000001 [ 613.893935] 0000000000000001 0000000000000001 ffffffff810b9580 ffff8801d86a7d40 [ 613.901923] ffffffff81ebf127 0000000000000001 0000000000000000 0000000000000003 [ 613.909902] Call Trace: [ 613.912486] [] dump_stack+0xc1/0x128 [ 613.917858] [] ? irq_force_complete_move+0x320/0x320 [ 613.924585] [] nmi_cpu_backtrace.cold.2+0x48/0x87 [ 613.931045] [] ? irq_force_complete_move+0x320/0x320 [ 613.937774] [] nmi_trigger_cpumask_backtrace+0x12a/0x14f [ 613.944845] [] arch_trigger_cpumask_backtrace+0x14/0x20 [ 613.951828] [] watchdog+0x6b4/0xa20 [ 613.957075] [] ? watchdog+0x11c/0xa20 [ 613.962523] [] kthread+0x26d/0x300 [ 613.967686] [] ? reset_hung_task_detector+0x20/0x20 [ 613.974323] [] ? kthread_park+0xa0/0xa0 [ 613.979923] [] ? kthread_park+0xa0/0xa0 [ 613.985517] [] ? kthread_park+0xa0/0xa0 [ 613.991116] [] ret_from_fork+0x5c/0x70 [ 613.996737] Sending NMI from CPU 1 to CPUs 0: [ 614.001246] NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff839f8596 [ 614.008617] Kernel panic - not syncing: hung_task: blocked tasks [ 614.014739] CPU: 0 PID: 519 Comm: khungtaskd Not tainted 4.9.109-ge1815b3 #52 [ 614.021983] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 614.031305] ffff8801d86a7cc8 ffffffff81eb3e29 ffffffff83c8bbe0 00000000ffffffff [ 614.039293] 0000000000000000 0000000000000000 dffffc0000000000 ffff8801d86a7d88 [ 614.047268] ffffffff81421925 0000000041b58ab3 ffffffff843b9a40 ffffffff81421766 [ 614.055244] Call Trace: [ 614.057801] [] dump_stack+0xc1/0x128 [ 614.063139] [] panic+0x1bf/0x3bc [ 614.068127] [] ? add_taint.cold.6+0x16/0x16 [ 614.074074] [] ? ___preempt_schedule+0x16/0x18 [ 614.080279] [] ? nmi_trigger_cpumask_backtrace+0x100/0x14f [ 614.087533] [] watchdog+0x6c5/0xa20 [ 614.092779] [] ? watchdog+0x11c/0xa20 [ 614.098201] [] kthread+0x26d/0x300 [ 614.103366] [] ? reset_hung_task_detector+0x20/0x20 [ 614.110000] [] ? kthread_park+0xa0/0xa0 [ 614.115597] [] ? kthread_park+0xa0/0xa0 [ 614.121192] [] ? kthread_park+0xa0/0xa0 [ 614.126792] [] ret_from_fork+0x5c/0x70 [ 614.132959] Dumping ftrace buffer: [ 614.136596] (ftrace buffer empty) [ 614.140277] Kernel Offset: disabled [ 614.144060] Rebooting in 86400 seconds..