[ OK ] Started Serial Getty on ttyS0. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.246' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 1001.313313] INFO: task systemd-udevd:4627 blocked for more than 140 seconds. [ 1001.320628] Not tainted 4.14.228-syzkaller #0 [ 1001.326871] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1001.334894] systemd-udevd D25768 4627 1 0x00000104 [ 1001.340509] Call Trace: [ 1001.343137] __schedule+0x88b/0x1de0 [ 1001.346846] ? io_schedule_timeout+0x140/0x140 [ 1001.351405] ? lock_downgrade+0x740/0x740 [ 1001.355594] schedule+0x8d/0x1b0 [ 1001.358958] schedule_preempt_disabled+0xf/0x20 [ 1001.363921] __mutex_lock+0x669/0x1310 [ 1001.367898] ? __mutex_lock+0x291/0x1310 [ 1001.371951] ? lo_open+0x19/0xb0 [ 1001.375394] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1001.380839] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1001.386356] ? exact_match+0x9/0x20 [ 1001.389982] ? kobj_lookup+0x31e/0x400 [ 1001.393911] lo_open+0x19/0xb0 [ 1001.397119] ? loop_unregister_transfer+0x90/0x90 [ 1001.401941] __blkdev_get+0xa8c/0x1090 [ 1001.405866] ? lookup_fast+0x430/0xe30 [ 1001.409745] ? sb_min_blocksize+0x1d0/0x1d0 [ 1001.414090] ? fsnotify+0x974/0x11b0 [ 1001.417800] blkdev_get+0x88/0x890 [ 1001.421337] ? __blkdev_get+0x1090/0x1090 [ 1001.425519] ? lock_downgrade+0x740/0x740 [ 1001.429660] ? do_raw_spin_unlock+0x164/0x220 [ 1001.434183] ? _raw_spin_unlock+0x29/0x40 [ 1001.438323] blkdev_open+0x1cc/0x250 [ 1001.442014] ? security_file_open+0x82/0x190 [ 1001.446458] do_dentry_open+0x44b/0xec0 [ 1001.450424] ? blkdev_get_by_dev+0x70/0x70 [ 1001.454684] vfs_open+0x105/0x220 [ 1001.458132] path_openat+0x628/0x2970 [ 1001.461911] ? path_lookupat+0x780/0x780 [ 1001.466009] ? trace_hardirqs_on+0x10/0x10 [ 1001.470236] ? trace_hardirqs_on+0x10/0x10 [ 1001.474560] do_filp_open+0x179/0x3c0 [ 1001.478354] ? may_open_dev+0xe0/0xe0 [ 1001.482135] ? lock_downgrade+0x740/0x740 [ 1001.486374] ? do_raw_spin_unlock+0x164/0x220 [ 1001.490859] ? _raw_spin_unlock+0x29/0x40 [ 1001.495029] ? __alloc_fd+0x1be/0x490 [ 1001.498822] do_sys_open+0x296/0x410 [ 1001.502659] ? filp_open+0x60/0x60 [ 1001.506258] ? do_syscall_64+0x4c/0x640 [ 1001.510233] ? do_sys_open+0x410/0x410 [ 1001.514211] do_syscall_64+0x1d5/0x640 [ 1001.518098] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1001.523334] RIP: 0033:0x7fe635869840 [ 1001.527036] RSP: 002b:00007ffe6aa35288 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 1001.534952] RAX: ffffffffffffffda RBX: 00007ffe6aa35360 RCX: 00007fe635869840 [ 1001.542213] RDX: 00005625a55b0fe3 RSI: 00000000000a0800 RDI: 00005625a691a900 [ 1001.549555] RBP: 0000000000000000 R08: 00005625a55b0670 R09: 0000000000000010 [ 1001.556873] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe6aa35430 [ 1001.564190] R13: 00005625a690d010 R14: 00005625a691c500 R15: 00007ffe6aa35300 [ 1001.571499] INFO: task syz-executor039:8004 blocked for more than 140 seconds. [ 1001.579055] Not tainted 4.14.228-syzkaller #0 [ 1001.584138] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1001.592094] syz-executor039 D28912 8004 8003 0x00000004 [ 1001.597755] Call Trace: [ 1001.601741] __schedule+0x88b/0x1de0 [ 1001.605511] ? io_schedule_timeout+0x140/0x140 [ 1001.610097] ? lock_downgrade+0x740/0x740 [ 1001.614283] schedule+0x8d/0x1b0 [ 1001.617646] schedule_preempt_disabled+0xf/0x20 [ 1001.622294] __mutex_lock+0x669/0x1310 [ 1001.626248] ? loop_control_ioctl+0x67/0x3f0 [ 1001.630653] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1001.636203] ? lock_acquire+0x170/0x3f0 [ 1001.640174] loop_control_ioctl+0x67/0x3f0 [ 1001.644614] ? loop_lookup+0x190/0x190 [ 1001.648502] ? loop_lookup+0x190/0x190 [ 1001.652442] do_vfs_ioctl+0x75a/0xff0 [ 1001.656340] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 1001.661792] ? ioctl_preallocate+0x1a0/0x1a0 [ 1001.666264] ? kmem_cache_free+0x23a/0x2b0 [ 1001.670550] ? putname+0xcd/0x110 [ 1001.674193] ? do_sys_open+0x208/0x410 [ 1001.678109] ? filp_open+0x60/0x60 [ 1001.681633] ? security_file_ioctl+0x83/0xb0 [ 1001.686172] SyS_ioctl+0x7f/0xb0 [ 1001.689538] ? do_vfs_ioctl+0xff0/0xff0 [ 1001.693560] do_syscall_64+0x1d5/0x640 [ 1001.697446] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1001.702617] RIP: 0033:0x440009 [ 1001.705844] RSP: 002b:00007ffd371b6468 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 1001.713595] RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 0000000000440009 [ 1001.720858] RDX: 0000000000000000 RSI: 0000000000004c82 RDI: 0000000000000003 [ 1001.728164] RBP: 0000000000000000 R08: 000000000000000d R09: 000000000000000d [ 1001.735581] R10: 000000000000000d R11: 0000000000000246 R12: 0000000000403750 [ 1001.742843] R13: 00007ffd371b6490 R14: 00007ffd371b647c R15: 00007ffd371b6480 [ 1001.750181] INFO: task syz-executor039:8005 blocked for more than 140 seconds. [ 1001.757580] Not tainted 4.14.228-syzkaller #0 [ 1001.762592] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1001.770587] syz-executor039 D28664 8005 8001 0x00000004 [ 1001.776278] Call Trace: [ 1001.778873] __schedule+0x88b/0x1de0 [ 1001.782568] ? io_schedule_timeout+0x140/0x140 [ 1001.787334] ? lock_downgrade+0x740/0x740 [ 1001.791475] schedule+0x8d/0x1b0 [ 1001.794872] schedule_preempt_disabled+0xf/0x20 [ 1001.799540] __mutex_lock+0x669/0x1310 [ 1001.803467] ? loop_control_ioctl+0x181/0x3f0 [ 1001.807953] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1001.813451] ? loop_queue_work+0x1e80/0x1e80 [ 1001.817939] loop_control_ioctl+0x181/0x3f0 [ 1001.822238] ? loop_lookup+0x190/0x190 [ 1001.826183] ? loop_lookup+0x190/0x190 [ 1001.830067] do_vfs_ioctl+0x75a/0xff0 [ 1001.833897] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 1001.839341] ? ioctl_preallocate+0x1a0/0x1a0 [ 1001.843792] ? kmem_cache_free+0x23a/0x2b0 [ 1001.848022] ? putname+0xcd/0x110 [ 1001.851455] ? do_sys_open+0x208/0x410 [ 1001.855368] ? filp_open+0x60/0x60 [ 1001.858903] ? security_file_ioctl+0x83/0xb0 [ 1001.863524] SyS_ioctl+0x7f/0xb0 [ 1001.866880] ? do_vfs_ioctl+0xff0/0xff0 [ 1001.871065] do_syscall_64+0x1d5/0x640 [ 1001.874997] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1001.880205] RIP: 0033:0x440009 [ 1001.883530] RSP: 002b:00007ffd371b6468 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 1001.891235] RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 0000000000440009 [ 1001.898540] RDX: 0000000000000002 RSI: 0000000000004c81 RDI: 0000000000000004 [ 1001.905853] RBP: 0000000000000000 R08: 000000000000000d R09: 000000000000000d [ 1001.913151] R10: 000000000000000d R11: 0000000000000246 R12: 0000000000403750 [ 1001.920409] R13: 00007ffd371b6490 R14: 00007ffd371b647c R15: 00007ffd371b6480 [ 1001.927755] INFO: task syz-executor039:8015 blocked for more than 140 seconds. [ 1001.935158] Not tainted 4.14.228-syzkaller #0 [ 1001.940162] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1001.948180] syz-executor039 D28912 8015 8002 0x00000004 [ 1001.953877] Call Trace: [ 1001.956449] __schedule+0x88b/0x1de0 [ 1001.960139] ? io_schedule_timeout+0x140/0x140 [ 1001.964754] ? lock_downgrade+0x740/0x740 [ 1001.968897] schedule+0x8d/0x1b0 [ 1001.972240] schedule_preempt_disabled+0xf/0x20 [ 1001.976935] __mutex_lock+0x669/0x1310 [ 1001.980841] ? lo_release+0x1b/0x190 [ 1001.984600] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1001.990043] ? __blkdev_put+0x330/0x800 [ 1001.994186] ? lock_downgrade+0x740/0x740 [ 1001.998345] ? loop_clr_fd+0xc20/0xc20 [ 1002.002207] lo_release+0x1b/0x190 [ 1002.005803] ? loop_clr_fd+0xc20/0xc20 [ 1002.009687] __blkdev_put+0x5aa/0x800 [ 1002.013555] ? revalidate_disk+0x1f0/0x1f0 [ 1002.017783] ? locks_remove_file+0x2cd/0x420 [ 1002.022170] ? blkdev_put+0x75/0x4c0 [ 1002.025917] ? blkdev_put+0x4c0/0x4c0 [ 1002.029719] blkdev_close+0x86/0xb0 [ 1002.033373] __fput+0x25f/0x7a0 [ 1002.036659] task_work_run+0x11f/0x190 [ 1002.040551] exit_to_usermode_loop+0x1ad/0x200 [ 1002.045179] do_syscall_64+0x4a3/0x640 [ 1002.049059] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1002.054274] RIP: 0033:0x4024a3 [ 1002.057450] RSP: 002b:00007ffd371b6208 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 1002.065448] RAX: 0000000000000000 RBX: 00007ffd371b6230 RCX: 00000000004024a3 [ 1002.072703] RDX: 0000000000000000 RSI: 0000000000004c01 RDI: 0000000000000004 [ 1002.080022] RBP: 0000000000000004 R08: 0000000000000001 R09: 00007ffd371b60a0 [ 1002.087334] R10: 00007ffd371b5f57 R11: 0000000000000246 R12: 0000000000000003 [ 1002.094640] R13: 00000000006ff2c0 R14: 00007ffd371b62b0 R15: 0000000000000008 [ 1002.101945] INFO: task syz-executor039:8019 blocked for more than 140 seconds. [ 1002.109448] Not tainted 4.14.228-syzkaller #0 [ 1002.114497] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1002.122471] syz-executor039 D28912 8019 8000 0x00000004 [ 1002.128136] Call Trace: [ 1002.130717] __schedule+0x88b/0x1de0 [ 1002.134477] ? io_schedule_timeout+0x140/0x140 [ 1002.139052] ? lock_downgrade+0x740/0x740 [ 1002.143266] schedule+0x8d/0x1b0 [ 1002.146622] schedule_preempt_disabled+0xf/0x20 [ 1002.151265] __mutex_lock+0x669/0x1310 [ 1002.155182] ? blkdev_reread_part+0x1b/0x40 [ 1002.159493] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1002.164979] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 1002.170077] ? __wake_up_common+0x5d0/0x5d0 [ 1002.174448] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 1002.179562] blkdev_reread_part+0x1b/0x40 [ 1002.183745] loop_clr_fd+0x9ca/0xc20 [ 1002.187451] lo_ioctl+0x895/0x1cd0 [ 1002.190969] ? __check_object_size+0x179/0x230 [ 1002.195591] ? loop_set_status64+0xe0/0xe0 [ 1002.199817] blkdev_ioctl+0x540/0x1830 [ 1002.203883] ? blkpg_ioctl+0x8d0/0x8d0 [ 1002.207760] ? getname_flags+0x22e/0x550 [ 1002.211801] block_ioctl+0xd9/0x120 [ 1002.215451] ? blkdev_fallocate+0x3a0/0x3a0 [ 1002.219766] do_vfs_ioctl+0x75a/0xff0 [ 1002.223602] ? ioctl_preallocate+0x1a0/0x1a0 [ 1002.228001] ? SyS_fstat+0xd0/0xd0 [ 1002.231519] ? kmem_cache_free+0x23a/0x2b0 [ 1002.235797] ? putname+0xcd/0x110 [ 1002.239240] ? do_sys_open+0x208/0x410 [ 1002.243163] ? filp_open+0x60/0x60 [ 1002.246700] ? security_file_ioctl+0x83/0xb0 [ 1002.251084] SyS_ioctl+0x7f/0xb0 [ 1002.254474] ? do_vfs_ioctl+0xff0/0xff0 [ 1002.258439] do_syscall_64+0x1d5/0x640 [ 1002.262303] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1002.267521] RIP: 0033:0x43feb7 [ 1002.270700] RSP: 002b:00007ffd371b6208 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 1002.278435] RAX: ffffffffffffffda RBX: 00007ffd371b6230 RCX: 000000000043feb7 [ 1002.285748] RDX: 0000000000000000 RSI: 0000000000004c01 RDI: 0000000000000004 [ 1002.293060] RBP: 0000000000000004 R08: 0000000000000001 R09: 00007ffd371b60a0 [ 1002.300323] R10: 00007ffd371b5f57 R11: 0000000000000246 R12: 0000000000000003 [ 1002.307636] R13: 00000000006ff2c0 R14: 00007ffd371b62b0 R15: 0000000000000008 [ 1002.314975] INFO: task syz-executor039:8030 blocked for more than 140 seconds. [ 1002.322320] Not tainted 4.14.228-syzkaller #0 [ 1002.327361] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1002.335361] syz-executor039 D28864 8030 7999 0x00000004 [ 1002.340996] Call Trace: [ 1002.343613] __schedule+0x88b/0x1de0 [ 1002.347327] ? io_schedule_timeout+0x140/0x140 [ 1002.351908] ? lock_downgrade+0x740/0x740 [ 1002.356088] schedule+0x8d/0x1b0 [ 1002.359447] schedule_preempt_disabled+0xf/0x20 [ 1002.364161] __mutex_lock+0x669/0x1310 [ 1002.368064] ? lo_release+0x1b/0x190 [ 1002.371758] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1002.377238] ? __blkdev_put+0x330/0x800 [ 1002.381206] ? lock_downgrade+0x740/0x740 [ 1002.385391] ? loop_clr_fd+0xc20/0xc20 [ 1002.389271] lo_release+0x1b/0x190 [ 1002.392800] ? loop_clr_fd+0xc20/0xc20 [ 1002.396721] __blkdev_put+0x5aa/0x800 [ 1002.400515] ? revalidate_disk+0x1f0/0x1f0 [ 1002.404785] ? locks_remove_file+0x2cd/0x420 [ 1002.409183] ? blkdev_put+0x75/0x4c0 [ 1002.412886] ? blkdev_put+0x4c0/0x4c0 [ 1002.416856] blkdev_close+0x86/0xb0 [ 1002.420496] __fput+0x25f/0x7a0 [ 1002.423831] task_work_run+0x11f/0x190 [ 1002.427723] exit_to_usermode_loop+0x1ad/0x200 [ 1002.432282] do_syscall_64+0x4a3/0x640 [ 1002.436199] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1002.441375] RIP: 0033:0x4024a3 [ 1002.444595] RSP: 002b:00007ffd371b6208 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 1002.452314] RAX: 0000000000000000 RBX: 00007ffd371b6230 RCX: 00000000004024a3 [ 1002.459613] RDX: 0000000000000000 RSI: 0000000000004c01 RDI: 0000000000000004 [ 1002.466933] RBP: 0000000000000004 R08: 0000000000000001 R09: 00007ffd371b60a0 [ 1002.474235] R10: 00007ffd371b5f57 R11: 0000000000000246 R12: 0000000000000003 [ 1002.481509] R13: 00000000006ff2c0 R14: 00007ffd371b62b0 R15: 0000000000000008 [ 1002.488865] INFO: task systemd-udevd:8036 blocked for more than 140 seconds. [ 1002.496084] Not tainted 4.14.228-syzkaller #0 [ 1002.501099] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1002.509116] systemd-udevd D28880 8036 4627 0x00000100 [ 1002.514793] Call Trace: [ 1002.517373] __schedule+0x88b/0x1de0 [ 1002.521067] ? io_schedule_timeout+0x140/0x140 [ 1002.525714] ? lock_downgrade+0x740/0x740 [ 1002.529862] schedule+0x8d/0x1b0 [ 1002.533373] schedule_preempt_disabled+0xf/0x20 [ 1002.538040] __mutex_lock+0x669/0x1310 [ 1002.541927] ? __blkdev_get+0x191/0x1090 [ 1002.546032] ? __mutex_lock+0x290/0x1310 [ 1002.550090] ? lo_open+0x19/0xb0 [ 1002.553492] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1002.558949] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1002.564441] ? exact_match+0x9/0x20 [ 1002.568062] ? kobj_lookup+0x31e/0x400 [ 1002.571944] lo_open+0x19/0xb0 [ 1002.575202] ? loop_unregister_transfer+0x90/0x90 [ 1002.580044] __blkdev_get+0xa8c/0x1090 [ 1002.583985] ? lookup_fast+0x430/0xe30 [ 1002.587880] ? sb_min_blocksize+0x1d0/0x1d0 [ 1002.592186] ? fsnotify+0x974/0x11b0 [ 1002.595937] blkdev_get+0x88/0x890 [ 1002.599472] ? __blkdev_get+0x1090/0x1090 [ 1002.603659] ? lock_downgrade+0x740/0x740 [ 1002.607812] ? do_raw_spin_unlock+0x164/0x220 [ 1002.612290] ? _raw_spin_unlock+0x29/0x40 [ 1002.616476] blkdev_open+0x1cc/0x250 [ 1002.620184] ? security_file_open+0x82/0x190 [ 1002.624788] do_dentry_open+0x44b/0xec0 [ 1002.628758] ? blkdev_get_by_dev+0x70/0x70 [ 1002.633034] vfs_open+0x105/0x220 [ 1002.637097] path_openat+0x628/0x2970 [ 1002.640882] ? path_lookupat+0x780/0x780 [ 1002.645052] ? trace_hardirqs_on+0x10/0x10 [ 1002.649290] do_filp_open+0x179/0x3c0 [ 1002.653125] ? may_open_dev+0xe0/0xe0 [ 1002.656936] ? lock_downgrade+0x740/0x740 [ 1002.661088] ? do_raw_spin_unlock+0x164/0x220 [ 1002.665622] ? _raw_spin_unlock+0x29/0x40 [ 1002.669763] ? __alloc_fd+0x1be/0x490 [ 1002.673661] do_sys_open+0x296/0x410 [ 1002.677376] ? filp_open+0x60/0x60 [ 1002.681140] ? do_syscall_64+0x4c/0x640 [ 1002.685161] ? do_sys_open+0x410/0x410 [ 1002.689050] do_syscall_64+0x1d5/0x640 [ 1002.692986] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1002.698174] RIP: 0033:0x7fe635869840 [ 1002.701871] RSP: 002b:00007ffe6aa2fd98 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 1002.709632] RAX: ffffffffffffffda RBX: 00005625a690ddc0 RCX: 00007fe635869840 [ 1002.717003] RDX: 00005625a55b0fe3 RSI: 0000000000080000 RDI: 00005625a6911820 [ 1002.724318] RBP: 0000000000000001 R08: 00005625a55b0670 R09: 0000000000000110 [ 1002.731581] R10: 00000000000002fe R11: 0000000000000246 R12: 0000000000000000 [ 1002.738890] R13: 0000000000000000 R14: 00005625a6911530 R15: 00000000ffffffff [ 1002.746241] INFO: task syz-executor039:8042 blocked for more than 140 seconds. [ 1002.753626] Not tainted 4.14.228-syzkaller #0 [ 1002.758627] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1002.766624] syz-executor039 D28912 8042 7998 0x00000004 [ 1002.772272] Call Trace: [ 1002.774896] __schedule+0x88b/0x1de0 [ 1002.778607] ? io_schedule_timeout+0x140/0x140 [ 1002.783237] ? lock_downgrade+0x740/0x740 [ 1002.787389] schedule+0x8d/0x1b0 [ 1002.790738] schedule_preempt_disabled+0xf/0x20 [ 1002.795451] __mutex_lock+0x669/0x1310 [ 1002.799339] ? loop_control_ioctl+0x67/0x3f0 [ 1002.803962] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1002.809417] ? lock_acquire+0x170/0x3f0 [ 1002.813431] loop_control_ioctl+0x67/0x3f0 [ 1002.817662] ? loop_lookup+0x190/0x190 [ 1002.821529] ? loop_lookup+0x190/0x190 [ 1002.825463] do_vfs_ioctl+0x75a/0xff0 [ 1002.829258] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 1002.834896] ? ioctl_preallocate+0x1a0/0x1a0 [ 1002.839299] ? kmem_cache_free+0x23a/0x2b0 [ 1002.843582] ? putname+0xcd/0x110 [ 1002.847038] ? do_sys_open+0x208/0x410 [ 1002.850901] ? filp_open+0x60/0x60 [ 1002.854471] ? security_file_ioctl+0x83/0xb0 [ 1002.858869] SyS_ioctl+0x7f/0xb0 [ 1002.862976] ? do_vfs_ioctl+0xff0/0xff0 [ 1002.866940] do_syscall_64+0x1d5/0x640 [ 1002.870808] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1002.876023] RIP: 0033:0x440009 [ 1002.879199] RSP: 002b:00007ffd371b6468 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 1002.886956] RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 0000000000440009 [ 1002.894262] RDX: 0000000000000000 RSI: 0000000000004c82 RDI: 0000000000000003 [ 1002.901521] RBP: 0000000000000000 R08: 000000000000000d R09: 000000000000000d [ 1002.908822] R10: 000000000000000d R11: 0000000000000246 R12: 00000000000b8a53 [ 1002.916381] R13: 00007ffd371b6490 R14: 00007ffd371b647c R15: 00007ffd371b6480 [ 1002.923707] [ 1002.923707] Showing all locks held in the system: [ 1002.930027] 1 lock held by khungtaskd/1532: [ 1002.934454] #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a [ 1002.943583] 2 locks held by systemd-udevd/4627: [ 1002.948244] #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_get+0x191/0x1090 [ 1002.956967] #1: (loop_index_mutex){+.+.}, at: [] lo_open+0x19/0xb0 [ 1002.965108] 1 lock held by in:imklog/7660: [ 1002.969327] #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x1fb/0x2b0 [ 1002.977767] 1 lock held by syz-executor039/8004: [ 1002.982506] #0: (loop_index_mutex){+.+.}, at: [] loop_control_ioctl+0x67/0x3f0 [ 1002.991672] 2 locks held by syz-executor039/8005: [ 1002.996556] #0: (loop_index_mutex){+.+.}, at: [] loop_control_ioctl+0x67/0x3f0 [ 1003.007210] #1: (&lo->lo_ctl_mutex){+.+.}, at: [] loop_control_ioctl+0x181/0x3f0 [ 1003.019696] 2 locks held by syz-executor039/8015: [ 1003.024593] #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_put+0xd8/0x800 [ 1003.033151] #1: (loop_index_mutex){+.+.}, at: [] lo_release+0x1b/0x190 [ 1003.041589] 2 locks held by syz-executor039/8019: [ 1003.046484] #0: (&lo->lo_ctl_mutex/1){+.+.}, at: [] lo_ioctl+0x87/0x1cd0 [ 1003.055118] #1: (&bdev->bd_mutex){+.+.}, at: [] blkdev_reread_part+0x1b/0x40 [ 1003.064133] 2 locks held by syz-executor039/8030: [ 1003.068967] #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_put+0xd8/0x800 [ 1003.077499] #1: (loop_index_mutex){+.+.}, at: [] lo_release+0x1b/0x190 [ 1003.085989] 2 locks held by systemd-udevd/8036: [ 1003.090651] #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_get+0x191/0x1090 [ 1003.099361] #1: (loop_index_mutex){+.+.}, at: [] lo_open+0x19/0xb0 [ 1003.107495] 1 lock held by syz-executor039/8042: [ 1003.112234] #0: (loop_index_mutex){+.+.}, at: [] loop_control_ioctl+0x67/0x3f0 [ 1003.121365] [ 1003.123037] ============================================= [ 1003.123037] [ 1003.130077] NMI backtrace for cpu 0 [ 1003.130086] CPU: 0 PID: 1532 Comm: khungtaskd Not tainted 4.14.228-syzkaller #0 [ 1003.130091] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1003.130094] Call Trace: [ 1003.130109] dump_stack+0x1b2/0x281 [ 1003.130120] nmi_cpu_backtrace.cold+0x57/0x93 [ 1003.130129] ? irq_force_complete_move+0x350/0x350 [ 1003.130138] nmi_trigger_cpumask_backtrace+0x13a/0x180 [ 1003.130148] watchdog+0x5b9/0xb40 [ 1003.130156] ? hungtask_pm_notify+0x50/0x50 [ 1003.130165] kthread+0x30d/0x420 [ 1003.130172] ? kthread_create_on_node+0xd0/0xd0 [ 1003.130180] ret_from_fork+0x24/0x30 [ 1003.130194] Sending NMI from CPU 0 to CPUs 1: [ 1003.195629] NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff87223bce [ 1003.196588] Kernel panic - not syncing: hung_task: blocked tasks [ 1003.209000] CPU: 0 PID: 1532 Comm: khungtaskd Not tainted 4.14.228-syzkaller #0 [ 1003.216424] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1003.225752] Call Trace: [ 1003.228318] dump_stack+0x1b2/0x281 [ 1003.231921] panic+0x1f9/0x42d [ 1003.235088] ? add_taint.cold+0x16/0x16 [ 1003.239041] watchdog+0x5ca/0xb40 [ 1003.242470] ? hungtask_pm_notify+0x50/0x50 [ 1003.246770] kthread+0x30d/0x420 [ 1003.250117] ? kthread_create_on_node+0xd0/0xd0 [ 1003.254761] ret_from_fork+0x24/0x30 [ 1003.259578] Kernel Offset: disabled [ 1003.263209] Rebooting in 86400 seconds..