[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 32.194244] random: sshd: uninitialized urandom read (32 bytes read) [ 32.481986] kauditd_printk_skb: 9 callbacks suppressed [ 32.481993] audit: type=1400 audit(1571682858.846:35): avc: denied { map } for pid=6818 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 [ 32.536041] random: sshd: uninitialized urandom read (32 bytes read) [ 33.126292] random: sshd: uninitialized urandom read (32 bytes read) [ 730.308682] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.189' (ECDSA) to the list of known hosts. [ 736.024519] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 736.151722] audit: type=1400 audit(1571683562.516:36): avc: denied { map } for pid=6832 comm="syz-executor275" path="/root/syz-executor275971265" dev="sda1" ino=2233 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 1001.430176] INFO: task init:1 blocked for more than 140 seconds. [ 1001.436554] Not tainted 4.14.150 #0 [ 1001.441249] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1001.449245] init D25168 1 0 0x00000000 [ 1001.454955] Call Trace: [ 1001.457771] __schedule+0x7b8/0x1cd0 [ 1001.461540] ? pci_mmcfg_check_reserved+0x150/0x150 [ 1001.466621] ? lock_downgrade+0x740/0x740 [ 1001.470790] ? _raw_spin_unlock_irqrestore+0xa4/0xe0 [ 1001.475883] schedule+0x92/0x1c0 [ 1001.479324] ? d_alloc_parallel+0xf1a/0x1800 [ 1001.483762] d_alloc_parallel+0xf77/0x1800 [ 1001.487992] ? __d_lookup_rcu+0x630/0x630 [ 1001.492197] ? lookup_slow+0x138/0x440 [ 1001.496106] ? wake_up_q+0xf0/0xf0 [ 1001.499625] lookup_slow+0x188/0x440 [ 1001.503361] ? vfs_unlink+0x480/0x480 [ 1001.507155] walk_component+0x698/0x1d00 [ 1001.511311] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 1001.516233] ? path_init+0x1920/0x1920 [ 1001.520194] ? security_inode_permission+0xbb/0xf0 [ 1001.525183] ? fuse_getattr+0x2f0/0x2f0 [ 1001.529138] ? __inode_permission+0x84/0x320 [ 1001.533579] link_path_walk+0x81f/0x10a0 [ 1001.537633] ? walk_component+0x1d00/0x1d00 [ 1001.541990] path_lookupat.isra.0+0xcb/0x7b0 [ 1001.546434] ? path_parentat.isra.0+0x150/0x150 [ 1001.551132] ? find_held_lock+0x35/0x130 [ 1001.555253] ? cache_grow_end.part.0+0x92/0x160 [ 1001.559905] filename_lookup+0x18e/0x380 [ 1001.564007] ? lock_downgrade+0x740/0x740 [ 1001.568146] ? filename_parentat.isra.0+0x3b0/0x3b0 [ 1001.573708] ? check_preemption_disabled+0x3c/0x250 [ 1001.578756] ? __phys_addr_symbol+0x23/0x60 [ 1001.583113] ? __check_object_size+0x13b/0x2ac [ 1001.587689] ? getname_flags+0x243/0x580 [ 1001.591792] user_path_at_empty+0x43/0x50 [ 1001.595937] vfs_statx+0xcd/0x160 [ 1001.599380] ? vfs_statx_fd+0xa0/0xa0 [ 1001.603227] ? save_trace+0x290/0x290 [ 1001.607022] SYSC_newstat+0x95/0x100 [ 1001.610753] ? cp_new_stat+0x5a0/0x5a0 [ 1001.614718] ? __might_fault+0x110/0x1d0 [ 1001.618774] ? lock_downgrade+0x740/0x740 [ 1001.622999] ? do_syscall_64+0x53/0x640 [ 1001.626973] ? SyS_fstat+0x30/0x30 [ 1001.630536] SyS_newstat+0x1e/0x30 [ 1001.634072] do_syscall_64+0x1e8/0x640 [ 1001.637937] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 1001.642815] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 1001.647998] RIP: 0033:0x7fa47a700c65 [ 1001.651741] RSP: 002b:00007ffe5eb395a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000004 [ 1001.659483] RAX: ffffffffffffffda RBX: 00007ffe5eb397e0 RCX: 00007fa47a700c65 [ 1001.666788] RDX: 00007ffe5eb397e0 RSI: 00007ffe5eb397e0 RDI: 0000000000407545 [ 1001.674086] RBP: 0000000000000000 R08: 0000000001d2ab60 R09: 0000000000000001 [ 1001.681399] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 1001.688660] R13: 00007ffe5eb39ce0 R14: 0000000000000000 R15: 0000000000000000 [ 1001.696049] INFO: task cron:6730 blocked for more than 140 seconds. [ 1001.702817] Not tainted 4.14.150 #0 [ 1001.706956] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1001.714969] cron D25968 6730 1 0x00000000 [ 1001.720642] Call Trace: [ 1001.723216] __schedule+0x7b8/0x1cd0 [ 1001.726909] ? __mutex_lock+0x737/0x1470 [ 1001.730991] ? pci_mmcfg_check_reserved+0x150/0x150 [ 1001.736014] schedule+0x92/0x1c0 [ 1001.739371] schedule_preempt_disabled+0x13/0x20 [ 1001.744160] __mutex_lock+0x73c/0x1470 [ 1001.748039] ? save_trace+0x290/0x290 [ 1001.751990] ? fuse_lock_inode+0xbc/0xf0 [ 1001.756051] ? find_held_lock+0x35/0x130 [ 1001.760140] ? mutex_trylock+0x1c0/0x1c0 [ 1001.764193] ? __d_lookup_rcu+0x312/0x630 [ 1001.768347] mutex_lock_nested+0x16/0x20 [ 1001.772448] ? mutex_lock_nested+0x16/0x20 [ 1001.776686] fuse_lock_inode+0xbc/0xf0 [ 1001.780597] fuse_lookup+0x7a/0x380 [ 1001.784215] ? find_held_lock+0x35/0x130 [ 1001.788254] ? fuse_lookup_name+0x610/0x610 [ 1001.792604] ? __d_lookup_rcu+0x630/0x630 [ 1001.796765] ? lock_acquire+0x16f/0x430 [ 1001.800762] ? lookup_slow+0x138/0x440 [ 1001.804643] lookup_slow+0x226/0x440 [ 1001.808340] ? vfs_unlink+0x480/0x480 [ 1001.812178] walk_component+0x698/0x1d00 [ 1001.816233] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 1001.821192] ? path_init+0x1920/0x1920 [ 1001.825070] ? security_inode_permission+0xbb/0xf0 [ 1001.830533] ? fuse_getattr+0x2f0/0x2f0 [ 1001.834556] ? __inode_permission+0x84/0x320 [ 1001.838952] link_path_walk+0x81f/0x10a0 [ 1001.843068] ? walk_component+0x1d00/0x1d00 [ 1001.847381] path_lookupat.isra.0+0xcb/0x7b0 [ 1001.851817] ? path_parentat.isra.0+0x150/0x150 [ 1001.856481] ? find_held_lock+0x35/0x130 [ 1001.860564] ? cache_grow_end.part.0+0x92/0x160 [ 1001.865225] filename_lookup+0x18e/0x380 [ 1001.869268] ? lock_downgrade+0x740/0x740 [ 1001.873440] ? filename_parentat.isra.0+0x3b0/0x3b0 [ 1001.878450] ? check_preemption_disabled+0x3c/0x250 [ 1001.883495] ? __phys_addr_symbol+0x23/0x60 [ 1001.887804] ? __check_object_size+0x13b/0x2ac [ 1001.892411] ? getname_flags+0x243/0x580 [ 1001.896463] user_path_at_empty+0x43/0x50 [ 1001.900627] vfs_statx+0xcd/0x160 [ 1001.904071] ? vfs_statx_fd+0xa0/0xa0 [ 1001.907987] SYSC_newstat+0x95/0x100 [ 1001.911721] ? cp_new_stat+0x5a0/0x5a0 [ 1001.915596] ? _copy_from_user+0x99/0x110 [ 1001.919776] ? enqueue_hrtimer+0x3b0/0x3b0 [ 1001.924100] ? SyS_nanosleep+0x12b/0x170 [ 1001.931919] ? do_syscall_64+0x53/0x640 [ 1001.935871] ? SyS_fstat+0x30/0x30 [ 1001.939387] SyS_newstat+0x1e/0x30 [ 1001.942941] do_syscall_64+0x1e8/0x640 [ 1001.946814] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 1001.951686] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 1001.956876] RIP: 0033:0x7f09fe6c7c65 [ 1001.961016] RSP: 002b:00007ffd25dbb598 EFLAGS: 00000246 ORIG_RAX: 0000000000000004 [ 1001.968709] RAX: ffffffffffffffda RBX: 00007f09fe745aa4 RCX: 00007f09fe6c7c65 [ 1001.976001] RDX: 00007ffd25dbb5e0 RSI: 00007ffd25dbb5e0 RDI: 00007f09fe745aa4 [ 1001.983288] RBP: 00007ffd25dbb6e0 R08: 0000000001eab710 R09: 0000000000000000 [ 1001.990586] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000000 [ 1001.997856] R13: 0000000000000001 R14: 000000000000002f R15: 0000000000000000 [ 1002.005255] INFO: task syz-executor275:6832 blocked for more than 140 seconds. [ 1002.012671] Not tainted 4.14.150 #0 [ 1002.016803] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1002.024799] syz-executor275 D28144 6832 6830 0x00000000 [ 1002.030455] Call Trace: [ 1002.033027] __schedule+0x7b8/0x1cd0 [ 1002.036716] ? __mutex_lock+0x737/0x1470 [ 1002.040800] ? pci_mmcfg_check_reserved+0x150/0x150 [ 1002.045832] schedule+0x92/0x1c0 [ 1002.049176] schedule_preempt_disabled+0x13/0x20 [ 1002.053955] __mutex_lock+0x73c/0x1470 [ 1002.057831] ? save_trace+0x290/0x290 [ 1002.061657] ? fuse_lock_inode+0xbc/0xf0 [ 1002.065707] ? d_alloc_parallel+0x670/0x1800 [ 1002.070425] ? mutex_trylock+0x1c0/0x1c0 [ 1002.074475] ? d_alloc_parallel+0x6bf/0x1800 [ 1002.078876] ? __d_lookup_rcu+0x312/0x630 [ 1002.083081] mutex_lock_nested+0x16/0x20 [ 1002.087221] ? mutex_lock_nested+0x16/0x20 [ 1002.091933] fuse_lock_inode+0xbc/0xf0 [ 1002.095901] fuse_lookup+0x7a/0x380 [ 1002.099506] ? find_held_lock+0x35/0x130 [ 1002.103593] ? fuse_lookup_name+0x610/0x610 [ 1002.107909] ? __d_lookup_rcu+0x630/0x630 [ 1002.112080] ? lock_acquire+0x16f/0x430 [ 1002.116046] ? lookup_slow+0x138/0x440 [ 1002.119913] lookup_slow+0x226/0x440 [ 1002.123669] ? vfs_unlink+0x480/0x480 [ 1002.127465] walk_component+0x698/0x1d00 [ 1002.131550] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 1002.136477] ? path_init+0x1920/0x1920 [ 1002.140382] ? security_inode_permission+0xbb/0xf0 [ 1002.145301] ? fuse_getattr+0x2f0/0x2f0 [ 1002.149253] ? __inode_permission+0x84/0x320 [ 1002.153689] link_path_walk+0x81f/0x10a0 [ 1002.157738] ? walk_component+0x1d00/0x1d00 [ 1002.162078] ? __mutex_init+0xd3/0x110 [ 1002.165955] path_openat+0x189/0x3f70 [ 1002.169748] ? save_trace+0x290/0x290 [ 1002.173573] ? path_lookupat.isra.0+0x7b0/0x7b0 [ 1002.178242] ? save_trace+0x290/0x290 [ 1002.182066] ? __alloc_fd+0x1d4/0x4a0 [ 1002.185854] do_filp_open+0x18e/0x250 [ 1002.189644] ? may_open_dev+0xe0/0xe0 [ 1002.193486] ? _raw_spin_unlock+0x2d/0x50 [ 1002.197636] ? __alloc_fd+0x1d4/0x4a0 [ 1002.201468] do_sys_open+0x2c5/0x430 [ 1002.205177] ? filp_open+0x70/0x70 [ 1002.208696] ? SyS_nanosleep+0x12b/0x170 [ 1002.212785] SyS_open+0x2d/0x40 [ 1002.216051] ? do_sys_open+0x430/0x430 [ 1002.219918] do_syscall_64+0x1e8/0x640 [ 1002.224280] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 1002.229144] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 1002.234393] RIP: 0033:0x444c90 [ 1002.237579] RSP: 002b:00007ffc7a0b4ec0 EFLAGS: 00000206 ORIG_RAX: 0000000000000002 [ 1002.245324] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000444c90 [ 1002.252614] RDX: 0000000000000000 RSI: 0000000000090800 RDI: 00000000004ae8f6 [ 1002.259872] RBP: 0000000000001ab4 R08: 0000000000001ab0 R09: 0000000000c76880 [ 1002.267211] R10: 0000000000000000 R11: 0000000000000206 R12: 00007ffc7a0b50f0 [ 1002.274508] R13: 00000000004075c0 R14: 0000000000000000 R15: 0000000000000000 [ 1002.281823] INFO: task syz-executor275:6836 blocked for more than 140 seconds. [ 1002.289175] Not tainted 4.14.150 #0 [ 1002.293345] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1002.301322] syz-executor275 D28480 6836 6832 0x00000004 [ 1002.306934] Call Trace: [ 1002.309507] __schedule+0x7b8/0x1cd0 [ 1002.313252] ? __mutex_lock+0x737/0x1470 [ 1002.317307] ? pci_mmcfg_check_reserved+0x150/0x150 [ 1002.322362] schedule+0x92/0x1c0 [ 1002.325717] schedule_preempt_disabled+0x13/0x20 [ 1002.330491] __mutex_lock+0x73c/0x1470 [ 1002.334371] ? save_trace+0x290/0x290 [ 1002.338160] ? fuse_lock_inode+0xbc/0xf0 [ 1002.342264] ? d_alloc_parallel+0x670/0x1800 [ 1002.346670] ? mutex_trylock+0x1c0/0x1c0 [ 1002.351165] ? d_alloc_parallel+0x6bf/0x1800 [ 1002.355562] ? __d_lookup_rcu+0x312/0x630 [ 1002.359696] mutex_lock_nested+0x16/0x20 [ 1002.363782] ? mutex_lock_nested+0x16/0x20 [ 1002.368009] fuse_lock_inode+0xbc/0xf0 [ 1002.371918] fuse_lookup+0x7a/0x380 [ 1002.375553] ? find_held_lock+0x35/0x130 [ 1002.379603] ? fuse_lookup_name+0x610/0x610 [ 1002.383949] ? __d_lookup_rcu+0x630/0x630 [ 1002.388101] ? lock_acquire+0x16f/0x430 [ 1002.392096] ? lookup_slow+0x138/0x440 [ 1002.396076] lookup_slow+0x226/0x440 [ 1002.399784] ? vfs_unlink+0x480/0x480 [ 1002.403614] walk_component+0x698/0x1d00 [ 1002.407676] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 1002.412628] ? path_init+0x1920/0x1920 [ 1002.416510] ? security_inode_permission+0xbb/0xf0 [ 1002.421462] ? fuse_getattr+0x2f0/0x2f0 [ 1002.425436] ? __inode_permission+0x84/0x320 [ 1002.429824] link_path_walk+0x81f/0x10a0 [ 1002.433919] ? walk_component+0x1d00/0x1d00 [ 1002.438232] ? __mutex_init+0xd3/0x110 [ 1002.442159] path_openat+0x189/0x3f70 [ 1002.445953] ? trace_hardirqs_on+0x10/0x10 [ 1002.450214] ? path_lookupat.isra.0+0x7b0/0x7b0 [ 1002.454874] ? find_held_lock+0x35/0x130 [ 1002.458913] ? save_trace+0x290/0x290 [ 1002.462753] ? __alloc_fd+0x1d4/0x4a0 [ 1002.466546] do_filp_open+0x18e/0x250 [ 1002.470387] ? may_open_dev+0xe0/0xe0 [ 1002.474185] ? _raw_spin_unlock+0x2d/0x50 [ 1002.478313] ? __alloc_fd+0x1d4/0x4a0 [ 1002.482574] do_sys_open+0x2c5/0x430 [ 1002.486277] ? filp_open+0x70/0x70 [ 1002.489797] SyS_open+0x2d/0x40 [ 1002.493098] ? do_sys_open+0x430/0x430 [ 1002.496977] do_syscall_64+0x1e8/0x640 [ 1002.500905] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 1002.505742] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 1002.510952] RIP: 0033:0x405800 [ 1002.514145] RSP: 002b:00007ffc7a0b4bc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 1002.521897] RAX: ffffffffffffffda RBX: 00007ffc7a0b4bf4 RCX: 0000000000405800 [ 1002.529168] RDX: 00007ffc7a0b4bfa RSI: 0000000000080001 RDI: 00000000004ae914 [ 1002.536542] RBP: 00007ffc7a0b4bf0 R08: 0000000000000000 R09: 0000000000000004 [ 1002.543838] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000407530 [ 1002.551131] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 1002.558396] [ 1002.558396] Showing all locks held in the system: [ 1002.564741] 1 lock held by init/1: [ 1002.568350] #0: (&type->i_mutex_dir_key#6){++++}, at: [] lookup_slow+0x138/0x440 [ 1002.577664] 1 lock held by khungtaskd/1016: [ 1002.582003] #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7f/0x21f [ 1002.591070] 2 locks held by udevd/3536: [ 1002.595017] #0: (&type->i_mutex_dir_key#6){++++}, at: [] lookup_slow+0x138/0x440 [ 1002.604320] #1: (&fi->mutex){+.+.}, at: [] fuse_lock_inode+0xbc/0xf0 [ 1002.612605] 1 lock held by rsyslogd/6685: [ 1002.616739] #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0xab/0xd0 [ 1002.626037] 2 locks held by cron/6730: [ 1002.629904] #0: (&type->i_mutex_dir_key#6){++++}, at: [] lookup_slow+0x138/0x440 [ 1002.639210] #1: (&fi->mutex){+.+.}, at: [] fuse_lock_inode+0xbc/0xf0 [ 1002.647483] 2 locks held by getty/6808: [ 1002.651466] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 [ 1002.660167] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 [ 1002.669525] 2 locks held by getty/6809: [ 1002.673526] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 [ 1002.682228] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 [ 1002.691538] 2 locks held by getty/6810: [ 1002.695507] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 [ 1002.704211] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 [ 1002.713546] 2 locks held by getty/6811: [ 1002.717501] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 [ 1002.726194] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 [ 1002.735526] 2 locks held by getty/6812: [ 1002.739479] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 [ 1002.748169] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 [ 1002.757483] 2 locks held by getty/6813: [ 1002.761474] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 [ 1002.770188] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 [ 1002.779478] 2 locks held by getty/6814: [ 1002.783468] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 [ 1002.792204] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 [ 1002.801529] 2 locks held by syz-executor275/6832: [ 1002.806358] #0: (&type->i_mutex_dir_key#6){++++}, at: [] lookup_slow+0x138/0x440 [ 1002.815675] #1: (&fi->mutex){+.+.}, at: [] fuse_lock_inode+0xbc/0xf0 [ 1002.823965] 2 locks held by syz-executor275/6836: [ 1002.828802] #0: (&type->i_mutex_dir_key#6){++++}, at: [] lookup_slow+0x138/0x440 [ 1002.838221] #1: (&fi->mutex){+.+.}, at: [] fuse_lock_inode+0xbc/0xf0 [ 1002.846534] [ 1002.848148] ============================================= [ 1002.848148] [ 1002.855418] NMI backtrace for cpu 1 [ 1002.859049] CPU: 1 PID: 1016 Comm: khungtaskd Not tainted 4.14.150 #0 [ 1002.865647] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1002.874977] Call Trace: [ 1002.877603] dump_stack+0x138/0x197 [ 1002.881210] nmi_cpu_backtrace.cold+0x57/0x94 [ 1002.885727] ? irq_force_complete_move.cold+0x7d/0x7d [ 1002.890895] nmi_trigger_cpumask_backtrace+0x141/0x189 [ 1002.896153] arch_trigger_cpumask_backtrace+0x14/0x20 [ 1002.901456] watchdog+0x5e7/0xb90 [ 1002.904915] kthread+0x319/0x430 [ 1002.908258] ? hungtask_pm_notify+0x50/0x50 [ 1002.912557] ? kthread_create_on_node+0xd0/0xd0 [ 1002.917207] ret_from_fork+0x24/0x30 [ 1002.921016] Sending NMI from CPU 1 to CPUs 0: [ 1002.925571] NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff861c3a9e [ 1002.926527] Kernel panic - not syncing: hung_task: blocked tasks [ 1002.938895] CPU: 1 PID: 1016 Comm: khungtaskd Not tainted 4.14.150 #0 [ 1002.945461] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1002.954809] Call Trace: [ 1002.957386] dump_stack+0x138/0x197 [ 1002.961057] panic+0x1f9/0x42d [ 1002.964241] ? add_taint.cold+0x16/0x16 [ 1002.968194] ? irq_force_complete_move.cold+0x7d/0x7d [ 1002.973366] watchdog+0x5f8/0xb90 [ 1002.976804] kthread+0x319/0x430 [ 1002.980172] ? hungtask_pm_notify+0x50/0x50 [ 1002.984480] ? kthread_create_on_node+0xd0/0xd0 [ 1002.989149] ret_from_fork+0x24/0x30 [ 1002.994493] Kernel Offset: disabled [ 1002.998125] Rebooting in 86400 seconds..