[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.176' (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 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 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 syzkaller login: [ 1001.398077] INFO: task systemd-udevd:8108 blocked for more than 140 seconds. [ 1001.405354] Not tainted 4.14.232-syzkaller #0 [ 1001.410648] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1001.418816] systemd-udevd D28496 8108 4630 0x00000104 [ 1001.424454] Call Trace: [ 1001.427064] __schedule+0x88b/0x1de0 [ 1001.430825] ? io_schedule_timeout+0x140/0x140 [ 1001.435410] ? lock_downgrade+0x740/0x740 [ 1001.439619] schedule+0x8d/0x1b0 [ 1001.442990] schedule_preempt_disabled+0xf/0x20 [ 1001.447644] __mutex_lock+0x669/0x1310 [ 1001.452203] ? lo_release+0x1b/0x190 [ 1001.455975] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1001.461499] ? blkdev_put+0x27/0x4c0 [ 1001.465238] ? blkdev_put+0x75/0x4c0 [ 1001.468991] ? lock_downgrade+0x740/0x740 [ 1001.473145] ? loop_clr_fd+0xc20/0xc20 [ 1001.477021] ? blkdev_put+0x4c0/0x4c0 [ 1001.480873] lo_release+0x1b/0x190 [ 1001.484422] ? loop_clr_fd+0xc20/0xc20 [ 1001.488343] __blkdev_put+0x5aa/0x800 [ 1001.492179] ? revalidate_disk+0x1f0/0x1f0 [ 1001.496396] ? locks_remove_file+0x2cd/0x420 [ 1001.500860] ? blkdev_put+0x75/0x4c0 [ 1001.504611] ? blkdev_put+0x4c0/0x4c0 [ 1001.508445] blkdev_close+0x86/0xb0 [ 1001.512080] __fput+0x25f/0x7a0 [ 1001.515349] task_work_run+0x11f/0x190 [ 1001.519302] exit_to_usermode_loop+0x1ad/0x200 [ 1001.524005] do_syscall_64+0x4a3/0x640 [ 1001.528012] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1001.533214] RIP: 0033:0x7fe4ffd58270 [ 1001.536906] RSP: 002b:00007ffec6b20f18 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 1001.544709] RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007fe4ffd58270 [ 1001.552599] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000007 [ 1001.560006] RBP: 00007fe500c12710 R08: 000056316334ad70 R09: 000056316334ab00 [ 1001.567271] R10: 00007fe500c128c0 R11: 0000000000000246 R12: 0000000000000000 [ 1001.574595] R13: 0000563163348d50 R14: 0000000000000003 R15: 000000000000000e [ 1001.582316] INFO: task syz-executor240:8354 blocked for more than 140 seconds. [ 1001.589727] Not tainted 4.14.232-syzkaller #0 [ 1001.594757] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1001.602771] syz-executor240 D28912 8354 7974 0x00000004 [ 1001.608461] Call Trace: [ 1001.611052] __schedule+0x88b/0x1de0 [ 1001.614771] ? io_schedule_timeout+0x140/0x140 [ 1001.619406] ? lock_downgrade+0x740/0x740 [ 1001.623558] schedule+0x8d/0x1b0 [ 1001.626929] schedule_preempt_disabled+0xf/0x20 [ 1001.631809] __mutex_lock+0x669/0x1310 [ 1001.635705] ? blkdev_reread_part+0x1b/0x40 [ 1001.640122] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1001.645607] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 1001.650774] ? __wake_up_common+0x5d0/0x5d0 [ 1001.655122] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 1001.660306] blkdev_reread_part+0x1b/0x40 [ 1001.664461] loop_set_status+0xeeb/0x12b0 [ 1001.668680] loop_set_status64+0x92/0xe0 [ 1001.672747] ? loop_set_status_old+0x200/0x200 [ 1001.677332] ? __mutex_lock+0x360/0x1310 [ 1001.681456] ? wait_for_completion_io+0x10/0x10 [ 1001.686128] ? set_blocksize+0x125/0x380 [ 1001.690248] lo_ioctl+0x587/0x1cd0 [ 1001.693795] ? loop_set_status64+0xe0/0xe0 [ 1001.698086] blkdev_ioctl+0x540/0x1830 [ 1001.701982] ? blkpg_ioctl+0x8d0/0x8d0 [ 1001.705862] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 1001.711586] ? debug_check_no_obj_freed+0x2c0/0x680 [ 1001.716788] block_ioctl+0xd9/0x120 [ 1001.720478] ? blkdev_fallocate+0x3a0/0x3a0 [ 1001.725017] do_vfs_ioctl+0x75a/0xff0 [ 1001.728902] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 1001.734419] ? ioctl_preallocate+0x1a0/0x1a0 [ 1001.739146] ? kmem_cache_free+0x23a/0x2b0 [ 1001.743391] ? putname+0xcd/0x110 [ 1001.746831] ? do_sys_open+0x208/0x410 [ 1001.750785] ? filp_open+0x60/0x60 [ 1001.754341] ? security_file_ioctl+0x83/0xb0 [ 1001.758861] SyS_ioctl+0x7f/0xb0 [ 1001.762255] ? do_vfs_ioctl+0xff0/0xff0 [ 1001.766214] do_syscall_64+0x1d5/0x640 [ 1001.770169] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1001.775377] RIP: 0033:0x43feb7 [ 1001.778641] RSP: 002b:00007fff89b3e0f8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 1001.786410] RAX: ffffffffffffffda RBX: 00007fff89b3e120 RCX: 000000000043feb7 [ 1001.793744] RDX: 00007fff89b3e230 RSI: 0000000000004c04 RDI: 0000000000000004 [ 1001.801166] RBP: 0000000000000004 R08: 00007fff89b3df90 R09: 00000000fbad8001 [ 1001.808484] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003 [ 1001.815777] R13: 0000000000bb62c0 R14: 00007fff89b3e230 R15: 00007fff89b3e370 [ 1001.823142] INFO: task syz-executor240:8358 blocked for more than 140 seconds. [ 1001.830676] Not tainted 4.14.232-syzkaller #0 [ 1001.835723] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1001.844531] syz-executor240 D28912 8358 7977 0x00000004 [ 1001.850240] Call Trace: [ 1001.852828] __schedule+0x88b/0x1de0 [ 1001.856524] ? io_schedule_timeout+0x140/0x140 [ 1001.861147] ? lock_downgrade+0x740/0x740 [ 1001.865300] schedule+0x8d/0x1b0 [ 1001.868713] schedule_preempt_disabled+0xf/0x20 [ 1001.873515] __mutex_lock+0x669/0x1310 [ 1001.877409] ? loop_control_ioctl+0x67/0x3f0 [ 1001.881872] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1001.887343] ? lock_acquire+0x170/0x3f0 [ 1001.891371] loop_control_ioctl+0x67/0x3f0 [ 1001.895618] ? loop_lookup+0x190/0x190 [ 1001.899566] ? loop_lookup+0x190/0x190 [ 1001.903480] do_vfs_ioctl+0x75a/0xff0 [ 1001.907375] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 1001.912863] ? ioctl_preallocate+0x1a0/0x1a0 [ 1001.917298] ? kmem_cache_free+0x23a/0x2b0 [ 1001.921574] ? putname+0xcd/0x110 [ 1001.925035] ? do_sys_open+0x208/0x410 [ 1001.928993] ? filp_open+0x60/0x60 [ 1001.932559] ? security_file_ioctl+0x83/0xb0 [ 1001.936951] SyS_ioctl+0x7f/0xb0 [ 1001.940350] ? do_vfs_ioctl+0xff0/0xff0 [ 1001.944491] do_syscall_64+0x1d5/0x640 [ 1001.948443] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1001.953635] RIP: 0033:0x440009 [ 1001.956863] RSP: 002b:00007fff89b3e358 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 1001.964802] RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 0000000000440009 [ 1001.972239] RDX: 0000000000000000 RSI: 0000000000004c82 RDI: 0000000000000003 [ 1001.979562] RBP: 0000000000000000 R08: 000000000000000d R09: 000000000000000d [ 1001.986839] R10: 000000000000000d R11: 0000000000000246 R12: 00000000000b9587 [ 1001.994168] R13: 00007fff89b3e380 R14: 00007fff89b3e36c R15: 00007fff89b3e370 [ 1002.001551] INFO: task syz-executor240:8360 blocked for more than 140 seconds. [ 1002.009597] Not tainted 4.14.232-syzkaller #0 [ 1002.014639] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1002.022665] syz-executor240 D28912 8360 7976 0x00000004 [ 1002.028443] Call Trace: [ 1002.031039] __schedule+0x88b/0x1de0 [ 1002.034736] ? io_schedule_timeout+0x140/0x140 [ 1002.039386] ? lock_downgrade+0x740/0x740 [ 1002.043556] schedule+0x8d/0x1b0 [ 1002.046931] schedule_preempt_disabled+0xf/0x20 [ 1002.051638] __mutex_lock+0x669/0x1310 [ 1002.055530] ? loop_control_ioctl+0x67/0x3f0 [ 1002.059991] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1002.065466] ? lock_acquire+0x170/0x3f0 [ 1002.069497] loop_control_ioctl+0x67/0x3f0 [ 1002.073751] ? loop_lookup+0x190/0x190 [ 1002.077644] ? loop_lookup+0x190/0x190 [ 1002.081583] do_vfs_ioctl+0x75a/0xff0 [ 1002.085406] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 1002.090908] ? ioctl_preallocate+0x1a0/0x1a0 [ 1002.095320] ? kmem_cache_free+0x23a/0x2b0 [ 1002.099591] ? putname+0xcd/0x110 [ 1002.103074] ? do_sys_open+0x208/0x410 [ 1002.106952] ? filp_open+0x60/0x60 [ 1002.110539] ? security_file_ioctl+0x83/0xb0 [ 1002.114969] SyS_ioctl+0x7f/0xb0 [ 1002.118394] ? do_vfs_ioctl+0xff0/0xff0 [ 1002.122575] do_syscall_64+0x1d5/0x640 [ 1002.126595] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1002.131849] RIP: 0033:0x440009 [ 1002.135071] RSP: 002b:00007fff89b3e358 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 1002.142927] RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 0000000000440009 [ 1002.150380] RDX: 0000000000000000 RSI: 0000000000004c82 RDI: 0000000000000003 [ 1002.157653] RBP: 0000000000000000 R08: 000000000000000d R09: 000000000000000d [ 1002.164969] R10: 000000000000000d R11: 0000000000000246 R12: 00000000000b955f [ 1002.172290] R13: 00007fff89b3e380 R14: 00007fff89b3e36c R15: 00007fff89b3e370 [ 1002.179635] INFO: task syz-executor240:8364 blocked for more than 140 seconds. [ 1002.186993] Not tainted 4.14.232-syzkaller #0 [ 1002.192095] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1002.200123] syz-executor240 D28912 8364 7979 0x00000004 [ 1002.205765] Call Trace: [ 1002.208399] __schedule+0x88b/0x1de0 [ 1002.212147] ? io_schedule_timeout+0x140/0x140 [ 1002.216730] ? lock_downgrade+0x740/0x740 [ 1002.220918] schedule+0x8d/0x1b0 [ 1002.224288] schedule_preempt_disabled+0xf/0x20 [ 1002.228993] __mutex_lock+0x669/0x1310 [ 1002.232885] ? loop_control_ioctl+0x181/0x3f0 [ 1002.237365] ? lock_downgrade+0x740/0x740 [ 1002.241569] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1002.247029] ? loop_queue_work+0x1e80/0x1e80 [ 1002.251478] loop_control_ioctl+0x181/0x3f0 [ 1002.255800] ? loop_lookup+0x190/0x190 [ 1002.259747] ? loop_lookup+0x190/0x190 [ 1002.263634] do_vfs_ioctl+0x75a/0xff0 [ 1002.267422] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 1002.272936] ? ioctl_preallocate+0x1a0/0x1a0 [ 1002.277513] ? kmem_cache_free+0x23a/0x2b0 [ 1002.282023] ? putname+0xcd/0x110 [ 1002.285698] ? do_sys_open+0x208/0x410 [ 1002.289656] ? filp_open+0x60/0x60 [ 1002.293289] ? security_file_ioctl+0x83/0xb0 [ 1002.297856] SyS_ioctl+0x7f/0xb0 [ 1002.301228] ? do_vfs_ioctl+0xff0/0xff0 [ 1002.305228] do_syscall_64+0x1d5/0x640 [ 1002.309156] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1002.314346] RIP: 0033:0x440009 [ 1002.317547] RSP: 002b:00007fff89b3e358 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 1002.325304] RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 0000000000440009 [ 1002.332766] RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000004 [ 1002.340086] RBP: 0000000000000000 R08: 000000000000000d R09: 000000000000000d [ 1002.347361] R10: 000000000000000d R11: 0000000000000246 R12: 00000000000b960a [ 1002.354769] R13: 00007fff89b3e380 R14: 00007fff89b3e36c R15: 00007fff89b3e370 [ 1002.362115] INFO: task syz-executor240:8365 blocked for more than 140 seconds. [ 1002.369579] Not tainted 4.14.232-syzkaller #0 [ 1002.374591] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1002.382591] syz-executor240 D28912 8365 7978 0x00000004 [ 1002.388271] Call Trace: [ 1002.390870] __schedule+0x88b/0x1de0 [ 1002.394605] ? io_schedule_timeout+0x140/0x140 [ 1002.399251] ? lock_downgrade+0x740/0x740 [ 1002.403401] schedule+0x8d/0x1b0 [ 1002.406750] schedule_preempt_disabled+0xf/0x20 [ 1002.411454] __mutex_lock+0x669/0x1310 [ 1002.415349] ? loop_control_ioctl+0x67/0x3f0 [ 1002.419804] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1002.425263] ? lock_acquire+0x170/0x3f0 [ 1002.429275] loop_control_ioctl+0x67/0x3f0 [ 1002.433555] ? loop_lookup+0x190/0x190 [ 1002.437426] ? loop_lookup+0x190/0x190 [ 1002.441345] do_vfs_ioctl+0x75a/0xff0 [ 1002.445191] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 1002.450669] ? ioctl_preallocate+0x1a0/0x1a0 [ 1002.455079] ? kmem_cache_free+0x23a/0x2b0 [ 1002.459380] ? putname+0xcd/0x110 [ 1002.462860] ? do_sys_open+0x208/0x410 [ 1002.466731] ? filp_open+0x60/0x60 [ 1002.470302] ? security_file_ioctl+0x83/0xb0 [ 1002.474711] SyS_ioctl+0x7f/0xb0 [ 1002.478106] ? do_vfs_ioctl+0xff0/0xff0 [ 1002.482081] do_syscall_64+0x1d5/0x640 [ 1002.485956] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1002.491182] RIP: 0033:0x440009 [ 1002.494401] RSP: 002b:00007fff89b3e358 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 1002.502281] RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 0000000000440009 [ 1002.509637] RDX: 0000000000000000 RSI: 0000000000004c82 RDI: 0000000000000003 [ 1002.516937] RBP: 0000000000000000 R08: 000000000000000d R09: 000000000000000d [ 1002.524253] R10: 000000000000000d R11: 0000000000000246 R12: 00000000000b9609 [ 1002.531587] R13: 00007fff89b3e380 R14: 00007fff89b3e36c R15: 00007fff89b3e370 [ 1002.538930] INFO: task syz-executor240:8366 blocked for more than 140 seconds. [ 1002.546292] Not tainted 4.14.232-syzkaller #0 [ 1002.551366] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1002.559441] syz-executor240 D28912 8366 7975 0x00000004 [ 1002.565073] Call Trace: [ 1002.567652] __schedule+0x88b/0x1de0 [ 1002.571491] ? io_schedule_timeout+0x140/0x140 [ 1002.576076] ? lock_downgrade+0x740/0x740 [ 1002.580284] schedule+0x8d/0x1b0 [ 1002.583734] schedule_preempt_disabled+0xf/0x20 [ 1002.588512] __mutex_lock+0x669/0x1310 [ 1002.592408] ? loop_control_ioctl+0x67/0x3f0 [ 1002.596804] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1002.602299] ? lock_acquire+0x170/0x3f0 [ 1002.606276] loop_control_ioctl+0x67/0x3f0 [ 1002.610542] ? loop_lookup+0x190/0x190 [ 1002.614434] ? loop_lookup+0x190/0x190 [ 1002.618365] do_vfs_ioctl+0x75a/0xff0 [ 1002.622166] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 1002.627600] ? ioctl_preallocate+0x1a0/0x1a0 [ 1002.632049] ? kmem_cache_free+0x23a/0x2b0 [ 1002.636372] ? putname+0xcd/0x110 [ 1002.639962] ? do_sys_open+0x208/0x410 [ 1002.643857] ? filp_open+0x60/0x60 [ 1002.647400] ? security_file_ioctl+0x83/0xb0 [ 1002.651846] SyS_ioctl+0x7f/0xb0 [ 1002.655231] ? do_vfs_ioctl+0xff0/0xff0 [ 1002.659241] do_syscall_64+0x1d5/0x640 [ 1002.663134] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1002.668353] RIP: 0033:0x440009 [ 1002.671544] RSP: 002b:00007fff89b3e358 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 1002.679310] RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 0000000000440009 [ 1002.686622] RDX: 0000000000000000 RSI: 0000000000004c82 RDI: 0000000000000003 [ 1002.693963] RBP: 0000000000000000 R08: 000000000000000d R09: 000000000000000d [ 1002.701277] R10: 000000000000000d R11: 0000000000000246 R12: 00000000000b960d [ 1002.708617] R13: 00007fff89b3e380 R14: 00007fff89b3e36c R15: 00007fff89b3e370 [ 1002.716069] [ 1002.716069] Showing all locks held in the system: [ 1002.722532] 1 lock held by khungtaskd/1534: [ 1002.726998] #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a [ 1002.736130] 2 locks held by systemd-udevd/8108: [ 1002.740974] #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_put+0xd8/0x800 [ 1002.749822] #1: (loop_index_mutex){+.+.}, at: [] lo_release+0x1b/0x190 [ 1002.758311] 2 locks held by syz-executor240/8354: [ 1002.763176] #0: (&lo->lo_ctl_mutex/1){+.+.}, at: [] lo_ioctl+0x87/0x1cd0 [ 1002.771805] #1: (&bdev->bd_mutex){+.+.}, at: [] blkdev_reread_part+0x1b/0x40 [ 1002.780806] 1 lock held by syz-executor240/8358: [ 1002.785555] #0: (loop_index_mutex){+.+.}, at: [] loop_control_ioctl+0x67/0x3f0 [ 1002.794725] 1 lock held by syz-executor240/8360: [ 1002.799872] #0: (loop_index_mutex){+.+.}, at: [] loop_control_ioctl+0x67/0x3f0 [ 1002.809080] 2 locks held by syz-executor240/8364: [ 1002.813918] #0: (loop_index_mutex){+.+.}, at: [] loop_control_ioctl+0x67/0x3f0 [ 1002.823178] #1: (&lo->lo_ctl_mutex){+.+.}, at: [] loop_control_ioctl+0x181/0x3f0 [ 1002.832525] 1 lock held by syz-executor240/8365: [ 1002.837276] #0: (loop_index_mutex){+.+.}, at: [] loop_control_ioctl+0x67/0x3f0 [ 1002.846428] 1 lock held by syz-executor240/8366: [ 1002.851341] #0: (loop_index_mutex){+.+.}, at: [] loop_control_ioctl+0x67/0x3f0 [ 1002.860505] [ 1002.862132] ============================================= [ 1002.862132] [ 1002.869267] NMI backtrace for cpu 1 [ 1002.872900] CPU: 1 PID: 1534 Comm: khungtaskd Not tainted 4.14.232-syzkaller #0 [ 1002.880332] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1002.889674] Call Trace: [ 1002.892297] dump_stack+0x1b2/0x281 [ 1002.895947] nmi_cpu_backtrace.cold+0x57/0x93 [ 1002.900429] ? irq_force_complete_move+0x350/0x350 [ 1002.905342] nmi_trigger_cpumask_backtrace+0x13a/0x180 [ 1002.910605] watchdog+0x5b9/0xb40 [ 1002.914042] ? hungtask_pm_notify+0x50/0x50 [ 1002.918376] kthread+0x30d/0x420 [ 1002.921743] ? kthread_create_on_node+0xd0/0xd0 [ 1002.926391] ret_from_fork+0x24/0x30 [ 1002.930184] Sending NMI from CPU 1 to CPUs 0: [ 1002.935060] NMI backtrace for cpu 0 [ 1002.935065] CPU: 0 PID: 4615 Comm: systemd-journal Not tainted 4.14.232-syzkaller #0 [ 1002.935069] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1002.935072] task: ffff8880a1872600 task.stack: ffff8880a1878000 [ 1002.935075] RIP: 0010:__mod_node_page_state+0x55/0xd0 [ 1002.935078] RSP: 0018:ffff8880a187fcd8 EFLAGS: 00000097 [ 1002.935083] RAX: 0000000000000000 RBX: 0000000000040200 RCX: 0000000000000000 [ 1002.935087] RDX: 0000000000000000 RSI: ffffffff8790a220 RDI: ffffffff87ccea40 [ 1002.935090] RBP: 000000000002df0f R08: 0000000000001000 R09: ffffed10125a7800 [ 1002.935094] R10: 0000000000000000 R11: ffff8880a1872600 R12: 0000000000000006 [ 1002.935097] R13: 0000000000000002 R14: ffff88813fffb000 R15: 000000000002df08 [ 1002.935101] FS: 00007f6894efe8c0(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 [ 1002.935104] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1002.935108] CR2: 00007f68922eb000 CR3: 00000000a1f1d000 CR4: 00000000001406f0 [ 1002.935111] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 1002.935115] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 1002.935117] Call Trace: [ 1002.935119] ? __seccomp_filter+0xbd/0xd60 [ 1002.935121] cache_grow_begin+0x65d/0x700 [ 1002.935124] ? check_preemption_disabled+0x35/0x240 [ 1002.935127] cache_alloc_refill+0x273/0x350 [ 1002.935129] kmem_cache_alloc+0x333/0x3c0 [ 1002.935132] getname_flags+0xc8/0x550 [ 1002.935134] do_sys_open+0x1ce/0x410 [ 1002.935136] ? filp_open+0x60/0x60 [ 1002.935139] ? do_syscall_64+0x4c/0x640 [ 1002.935141] ? do_sys_open+0x410/0x410 [ 1002.935143] do_syscall_64+0x1d5/0x640 [ 1002.935146] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1002.935149] RIP: 0033:0x7f689448d840 [ 1002.935151] RSP: 002b:00007ffcf21e8618 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 1002.935157] RAX: ffffffffffffffda RBX: 00007ffcf21e8920 RCX: 00007f689448d840 [ 1002.935161] RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 00005653db041890 [ 1002.935164] RBP: 000000000000000d R08: 000000000000c0c1 R09: 00000000ffffffff [ 1002.935168] R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff [ 1002.935171] R13: 00005653db03d040 R14: 00007ffcf21e88e0 R15: 00005653db042c20 [ 1002.935173] Code: ec 08 80 3c 02 00 0f 85 85 00 00 00 4d 8b be 00 4d 00 00 41 89 f4 48 c7 c7 20 a2 90 87 e8 04 39 a9 01 4b 8d 6c 27 01 65 8a 5d 00 <48> c7 c7 20 a2 90 87 48 0f be db e8 eb 38 a9 01 4c 01 eb 65 41 [ 1002.935695] Kernel panic - not syncing: hung_task: blocked tasks [ 1003.170732] CPU: 1 PID: 1534 Comm: khungtaskd Not tainted 4.14.232-syzkaller #0 [ 1003.178187] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1003.187621] Call Trace: [ 1003.190226] dump_stack+0x1b2/0x281 [ 1003.193863] panic+0x1f9/0x42d [ 1003.197042] ? add_taint.cold+0x16/0x16 [ 1003.201010] watchdog+0x5ca/0xb40 [ 1003.204615] ? hungtask_pm_notify+0x50/0x50 [ 1003.208925] kthread+0x30d/0x420 [ 1003.212271] ? kthread_create_on_node+0xd0/0xd0 [ 1003.217040] ret_from_fork+0x24/0x30 [ 1003.221915] Kernel Offset: disabled [ 1003.225542] Rebooting in 86400 seconds..