[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.236' (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 syzkaller login: [ 1001.355392] INFO: task systemd-udevd:4627 blocked for more than 140 seconds. [ 1001.362689] Not tainted 4.14.217-syzkaller #0 [ 1001.368901] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1001.376898] systemd-udevd D25976 4627 1 0x00000104 [ 1001.382543] Call Trace: [ 1001.385107] __schedule+0x88b/0x1de0 [ 1001.388856] ? io_schedule_timeout+0x140/0x140 [ 1001.393428] ? lock_downgrade+0x740/0x740 [ 1001.397644] schedule+0x8d/0x1b0 [ 1001.401006] schedule_preempt_disabled+0xf/0x20 [ 1001.405695] __mutex_lock+0x669/0x1310 [ 1001.409572] ? _raw_spin_unlock+0x29/0x40 [ 1001.413694] ? __mutex_lock+0x360/0x1310 [ 1001.417774] ? lo_open+0x19/0xb0 [ 1001.421129] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1001.426637] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1001.432097] ? exact_match+0x9/0x20 [ 1001.435759] lo_open+0x19/0xb0 [ 1001.438942] ? loop_unregister_transfer+0x90/0x90 [ 1001.443760] __blkdev_get+0xa8c/0x1090 [ 1001.447732] ? lookup_fast+0x430/0xe30 [ 1001.451667] ? sb_min_blocksize+0x1d0/0x1d0 [ 1001.456006] ? fsnotify+0x974/0x11b0 [ 1001.459708] blkdev_get+0x88/0x890 [ 1001.463223] ? __blkdev_get+0x1090/0x1090 [ 1001.467517] ? lock_downgrade+0x740/0x740 [ 1001.471658] ? do_raw_spin_unlock+0x164/0x220 [ 1001.476312] ? _raw_spin_unlock+0x29/0x40 [ 1001.480449] blkdev_open+0x1cc/0x250 [ 1001.484149] ? security_file_open+0x82/0x190 [ 1001.488581] do_dentry_open+0x44b/0xec0 [ 1001.492543] ? blkdev_get_by_dev+0x70/0x70 [ 1001.496798] vfs_open+0x105/0x220 [ 1001.500250] path_openat+0x628/0x2970 [ 1001.504030] ? path_lookupat+0x780/0x780 [ 1001.508114] ? trace_hardirqs_on+0x10/0x10 [ 1001.512382] ? trace_hardirqs_on+0x10/0x10 [ 1001.516637] do_filp_open+0x179/0x3c0 [ 1001.520426] ? may_open_dev+0xe0/0xe0 [ 1001.524204] ? lock_downgrade+0x740/0x740 [ 1001.528373] ? do_raw_spin_unlock+0x164/0x220 [ 1001.532856] ? _raw_spin_unlock+0x29/0x40 [ 1001.537033] ? __alloc_fd+0x1be/0x490 [ 1001.540823] do_sys_open+0x296/0x410 [ 1001.544524] ? filp_open+0x60/0x60 [ 1001.548087] ? do_syscall_64+0x4c/0x640 [ 1001.552047] ? do_sys_open+0x410/0x410 [ 1001.555954] do_syscall_64+0x1d5/0x640 [ 1001.559833] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1001.564998] RIP: 0033:0x7fc8e06d1840 [ 1001.568736] RSP: 002b:00007ffe910d84d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 1001.576482] RAX: ffffffffffffffda RBX: 00007ffe910d85b0 RCX: 00007fc8e06d1840 [ 1001.583739] RDX: 000055991f122fe3 RSI: 00000000000a0800 RDI: 000055991f4bb5b0 [ 1001.591030] RBP: 0000000000000000 R08: 000055991f122670 R09: 0000000000000010 [ 1001.598324] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe910d8680 [ 1001.605624] R13: 000055991f4ad010 R14: 000055991f4bf670 R15: 00007ffe910d8550 [ 1001.612920] INFO: task systemd-udevd:8016 blocked for more than 140 seconds. [ 1001.620130] Not tainted 4.14.217-syzkaller #0 [ 1001.625126] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1001.633110] systemd-udevd D28712 8016 4627 0x00000100 [ 1001.638771] Call Trace: [ 1001.641348] __schedule+0x88b/0x1de0 [ 1001.645054] ? io_schedule_timeout+0x140/0x140 [ 1001.649669] ? lock_downgrade+0x740/0x740 [ 1001.653806] schedule+0x8d/0x1b0 [ 1001.657207] schedule_preempt_disabled+0xf/0x20 [ 1001.661867] __mutex_lock+0x669/0x1310 [ 1001.665780] ? lo_release+0x1b/0x190 [ 1001.669481] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1001.674926] ? __blkdev_put+0x330/0x800 [ 1001.678927] ? lock_downgrade+0x740/0x740 [ 1001.683065] ? loop_clr_fd+0xc20/0xc20 [ 1001.687121] lo_release+0x1b/0x190 [ 1001.690647] ? loop_clr_fd+0xc20/0xc20 [ 1001.694509] __blkdev_put+0x5aa/0x800 [ 1001.698338] ? revalidate_disk+0x1f0/0x1f0 [ 1001.702559] ? locks_remove_file+0x2cd/0x420 [ 1001.707010] ? blkdev_put+0x75/0x4c0 [ 1001.710714] ? blkdev_put+0x4c0/0x4c0 [ 1001.714490] blkdev_close+0x86/0xb0 [ 1001.718136] __fput+0x25f/0x7a0 [ 1001.721426] task_work_run+0x11f/0x190 [ 1001.725358] exit_to_usermode_loop+0x1ad/0x200 [ 1001.729929] do_syscall_64+0x4a3/0x640 [ 1001.733795] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1001.738998] RIP: 0033:0x7fc8e06d1270 [ 1001.742693] RSP: 002b:00007ffe910d83e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 1001.750439] RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007fc8e06d1270 [ 1001.757739] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000007 [ 1001.764996] RBP: 00007fc8e158a710 R08: 000055991f4b30b0 R09: 000055991f4b2e00 [ 1001.772315] R10: 00007fc8e158a8c0 R11: 0000000000000246 R12: 0000000000000000 [ 1001.779624] R13: 000055991f4c1af0 R14: 0000000000000003 R15: 000000000000000e [ 1001.786955] INFO: task syz-executor687:8028 blocked for more than 140 seconds. [ 1001.794299] Not tainted 4.14.217-syzkaller #0 [ 1001.799330] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1001.807319] syz-executor687 D28704 8028 7989 0x00000004 [ 1001.812936] Call Trace: [ 1001.815560] __schedule+0x88b/0x1de0 [ 1001.819268] ? io_schedule_timeout+0x140/0x140 [ 1001.823834] ? lock_downgrade+0x740/0x740 [ 1001.828014] schedule+0x8d/0x1b0 [ 1001.831371] schedule_preempt_disabled+0xf/0x20 [ 1001.836060] __mutex_lock+0x669/0x1310 [ 1001.839962] ? loop_control_ioctl+0x181/0x3f0 [ 1001.844438] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1001.849918] ? loop_queue_work+0x1e80/0x1e80 [ 1001.854316] loop_control_ioctl+0x181/0x3f0 [ 1001.858655] ? loop_lookup+0x190/0x190 [ 1001.862531] ? vm_insert_page+0x7c0/0x7c0 [ 1001.866700] ? loop_lookup+0x190/0x190 [ 1001.870579] do_vfs_ioctl+0x75a/0xff0 [ 1001.874355] ? ioctl_preallocate+0x1a0/0x1a0 [ 1001.878822] ? lock_downgrade+0x740/0x740 [ 1001.882978] ? security_file_ioctl+0x83/0xb0 [ 1001.887408] SyS_ioctl+0x7f/0xb0 [ 1001.890771] ? do_vfs_ioctl+0xff0/0xff0 [ 1001.894720] do_syscall_64+0x1d5/0x640 [ 1001.898769] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1001.903962] RIP: 0033:0x4416b9 [ 1001.907170] RSP: 002b:00007ffe022346e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 1001.914889] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004416b9 [ 1001.922178] RDX: 0000000000000004 RSI: 0000000000004c81 RDI: 0000000000000003 [ 1001.929478] RBP: 00000000000b96a2 R08: 0000000000000001 R09: 0000000000000001 [ 1001.936769] R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000402350 [ 1001.944034] R13: 00000000004023e0 R14: 0000000000000000 R15: 0000000000000000 [ 1001.951347] INFO: task syz-executor687:8033 blocked for more than 140 seconds. [ 1001.958739] Not tainted 4.14.217-syzkaller #0 [ 1001.963737] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1001.971740] syz-executor687 D28912 8033 7988 0x00000004 [ 1001.977457] Call Trace: [ 1001.980034] __schedule+0x88b/0x1de0 [ 1001.983728] ? io_schedule_timeout+0x140/0x140 [ 1001.988340] ? lock_downgrade+0x740/0x740 [ 1001.992521] schedule+0x8d/0x1b0 [ 1001.995937] schedule_preempt_disabled+0xf/0x20 [ 1002.000595] __mutex_lock+0x669/0x1310 [ 1002.004461] ? blkdev_reread_part+0x1b/0x40 [ 1002.008807] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1002.014255] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 1002.019381] ? __wake_up_common+0x5d0/0x5d0 [ 1002.023697] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 1002.028826] blkdev_reread_part+0x1b/0x40 [ 1002.032961] loop_set_status+0xeeb/0x12b0 [ 1002.037131] loop_set_status64+0x92/0xe0 [ 1002.041180] ? loop_set_status_old+0x200/0x200 [ 1002.045785] ? __mutex_lock+0x360/0x1310 [ 1002.052097] ? wait_for_completion_io+0x10/0x10 [ 1002.056785] ? set_blocksize+0x125/0x380 [ 1002.060839] lo_ioctl+0x587/0x1cd0 [ 1002.064358] ? loop_set_status64+0xe0/0xe0 [ 1002.068634] blkdev_ioctl+0x540/0x1830 [ 1002.072567] ? blkpg_ioctl+0x8d0/0x8d0 [ 1002.076480] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 1002.081574] ? debug_check_no_obj_freed+0x2c0/0x680 [ 1002.086620] block_ioctl+0xd9/0x120 [ 1002.090234] ? blkdev_fallocate+0x3a0/0x3a0 [ 1002.094530] do_vfs_ioctl+0x75a/0xff0 [ 1002.098349] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 1002.103832] ? ioctl_preallocate+0x1a0/0x1a0 [ 1002.108441] ? kmem_cache_free+0x23a/0x2b0 [ 1002.112676] ? putname+0xcd/0x110 [ 1002.116149] ? do_sys_open+0x208/0x410 [ 1002.120021] ? filp_open+0x60/0x60 [ 1002.123537] ? security_file_ioctl+0x83/0xb0 [ 1002.127964] SyS_ioctl+0x7f/0xb0 [ 1002.131338] ? do_vfs_ioctl+0xff0/0xff0 [ 1002.135346] do_syscall_64+0x1d5/0x640 [ 1002.139255] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1002.144418] RIP: 0033:0x4415c7 [ 1002.147625] RSP: 002b:00007ffe022344a8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 1002.155360] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00000000004415c7 [ 1002.162614] RDX: 00007ffe02234540 RSI: 0000000000004c04 RDI: 0000000000000004 [ 1002.169902] RBP: 0000000000000003 R08: 000000000000000a R09: 00007ffe02234700 [ 1002.177245] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000402350 [ 1002.184503] R13: 00000000004023e0 R14: 0000000000000000 R15: 0000000000000000 [ 1002.191855] INFO: task syz-executor687:8037 blocked for more than 140 seconds. [ 1002.199240] Not tainted 4.14.217-syzkaller #0 [ 1002.204235] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1002.212215] syz-executor687 D28912 8037 7986 0x00000004 [ 1002.217938] Call Trace: [ 1002.220538] __schedule+0x88b/0x1de0 [ 1002.224230] ? io_schedule_timeout+0x140/0x140 [ 1002.228840] ? lock_downgrade+0x740/0x740 [ 1002.233066] schedule+0x8d/0x1b0 [ 1002.236453] schedule_preempt_disabled+0xf/0x20 [ 1002.241109] __mutex_lock+0x669/0x1310 [ 1002.244973] ? loop_control_ioctl+0x67/0x3f0 [ 1002.249402] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1002.254842] ? __lock_acquire+0x5fc/0x3f20 [ 1002.259096] ? do_wp_page+0x24d/0x1db0 [ 1002.262971] ? finish_mkwrite_fault+0x5e0/0x5e0 [ 1002.267665] loop_control_ioctl+0x67/0x3f0 [ 1002.271893] ? loop_lookup+0x190/0x190 [ 1002.275812] ? vm_insert_page+0x7c0/0x7c0 [ 1002.279949] ? loop_lookup+0x190/0x190 [ 1002.283814] do_vfs_ioctl+0x75a/0xff0 [ 1002.287642] ? ioctl_preallocate+0x1a0/0x1a0 [ 1002.292073] ? lock_downgrade+0x740/0x740 [ 1002.296245] ? security_file_ioctl+0x83/0xb0 [ 1002.300645] SyS_ioctl+0x7f/0xb0 [ 1002.303987] ? do_vfs_ioctl+0xff0/0xff0 [ 1002.307987] do_syscall_64+0x1d5/0x640 [ 1002.311870] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1002.317222] RIP: 0033:0x4416b9 [ 1002.320400] RSP: 002b:00007ffe022346e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 1002.328173] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004416b9 [ 1002.335478] RDX: 0000000000000000 RSI: 0000000000004c82 RDI: 0000000000000003 [ 1002.342734] RBP: 00000000000b96ad R08: 0000000000000001 R09: 0000000000000001 [ 1002.350028] R10: 00007ffe02234700 R11: 0000000000000246 R12: 0000000000402350 [ 1002.357327] R13: 00000000004023e0 R14: 0000000000000000 R15: 0000000000000000 [ 1002.364705] INFO: task syz-executor687:8038 blocked for more than 140 seconds. [ 1002.372095] Not tainted 4.14.217-syzkaller #0 [ 1002.377132] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1002.385122] syz-executor687 D28704 8038 7987 0x00000004 [ 1002.390743] Call Trace: [ 1002.393309] __schedule+0x88b/0x1de0 [ 1002.397082] ? wp_page_copy+0xc31/0x25c0 [ 1002.401133] ? io_schedule_timeout+0x140/0x140 [ 1002.405736] ? lock_downgrade+0x740/0x740 [ 1002.409873] schedule+0x8d/0x1b0 [ 1002.413236] schedule_preempt_disabled+0xf/0x20 [ 1002.417939] __mutex_lock+0x669/0x1310 [ 1002.421829] ? loop_control_ioctl+0x67/0x3f0 [ 1002.426264] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1002.431737] ? __lock_acquire+0x5fc/0x3f20 [ 1002.436047] ? do_wp_page+0x24d/0x1db0 [ 1002.439930] ? finish_mkwrite_fault+0x5e0/0x5e0 [ 1002.444596] loop_control_ioctl+0x67/0x3f0 [ 1002.448850] ? loop_lookup+0x190/0x190 [ 1002.452732] ? vm_insert_page+0x7c0/0x7c0 [ 1002.456901] ? loop_lookup+0x190/0x190 [ 1002.460782] do_vfs_ioctl+0x75a/0xff0 [ 1002.464562] ? ioctl_preallocate+0x1a0/0x1a0 [ 1002.469006] ? lock_downgrade+0x740/0x740 [ 1002.473144] ? security_file_ioctl+0x83/0xb0 [ 1002.477581] SyS_ioctl+0x7f/0xb0 [ 1002.480930] ? do_vfs_ioctl+0xff0/0xff0 [ 1002.484879] do_syscall_64+0x1d5/0x640 [ 1002.488787] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1002.493965] RIP: 0033:0x4416b9 [ 1002.497172] RSP: 002b:00007ffe022346e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 1002.504869] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004416b9 [ 1002.512153] RDX: 0000000000000000 RSI: 0000000000004c82 RDI: 0000000000000003 [ 1002.519459] RBP: 00000000000b96a4 R08: 0000000000000001 R09: 0000000000000001 [ 1002.526923] R10: 00007ffe02234700 R11: 0000000000000246 R12: 0000000000402350 [ 1002.534169] R13: 00000000004023e0 R14: 0000000000000000 R15: 0000000000000000 [ 1002.541494] INFO: task syz-executor687:8045 blocked for more than 140 seconds. [ 1002.548891] Not tainted 4.14.217-syzkaller #0 [ 1002.553896] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1002.561880] syz-executor687 D28912 8045 7985 0x00000004 [ 1002.567539] Call Trace: [ 1002.570115] __schedule+0x88b/0x1de0 [ 1002.573802] ? wp_page_copy+0xc31/0x25c0 [ 1002.577890] ? io_schedule_timeout+0x140/0x140 [ 1002.582476] ? lock_downgrade+0x740/0x740 [ 1002.586644] schedule+0x8d/0x1b0 [ 1002.589997] schedule_preempt_disabled+0xf/0x20 [ 1002.594655] __mutex_lock+0x669/0x1310 [ 1002.598568] ? loop_control_ioctl+0x67/0x3f0 [ 1002.602978] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1002.608448] ? __lock_acquire+0x5fc/0x3f20 [ 1002.612671] ? do_wp_page+0x24d/0x1db0 [ 1002.616578] ? finish_mkwrite_fault+0x5e0/0x5e0 [ 1002.621234] loop_control_ioctl+0x67/0x3f0 [ 1002.625486] ? loop_lookup+0x190/0x190 [ 1002.629378] ? vm_insert_page+0x7c0/0x7c0 [ 1002.633497] ? loop_lookup+0x190/0x190 [ 1002.637408] do_vfs_ioctl+0x75a/0xff0 [ 1002.641194] ? ioctl_preallocate+0x1a0/0x1a0 [ 1002.645622] ? lock_downgrade+0x740/0x740 [ 1002.649759] ? security_file_ioctl+0x83/0xb0 [ 1002.654142] SyS_ioctl+0x7f/0xb0 [ 1002.657538] ? do_vfs_ioctl+0xff0/0xff0 [ 1002.661501] do_syscall_64+0x1d5/0x640 [ 1002.665418] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1002.670599] RIP: 0033:0x4416b9 [ 1002.673761] RSP: 002b:00007ffe022346e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 1002.681489] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004416b9 [ 1002.688782] RDX: 0000000000000000 RSI: 0000000000004c82 RDI: 0000000000000003 [ 1002.696079] RBP: 00000000000b9715 R08: 0000000000000001 R09: 0000000000000001 [ 1002.703334] R10: 00007ffe02234700 R11: 0000000000000246 R12: 0000000000402350 [ 1002.710618] R13: 00000000004023e0 R14: 0000000000000000 R15: 0000000000000000 [ 1002.717960] INFO: task syz-executor687:8046 blocked for more than 140 seconds. [ 1002.725351] Not tainted 4.14.217-syzkaller #0 [ 1002.730363] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1002.738493] syz-executor687 D28912 8046 7984 0x00000004 [ 1002.744118] Call Trace: [ 1002.746731] __schedule+0x88b/0x1de0 [ 1002.750432] ? wp_page_copy+0xc31/0x25c0 [ 1002.754472] ? io_schedule_timeout+0x140/0x140 [ 1002.759073] ? lock_downgrade+0x740/0x740 [ 1002.763222] schedule+0x8d/0x1b0 [ 1002.766606] schedule_preempt_disabled+0xf/0x20 [ 1002.771261] __mutex_lock+0x669/0x1310 [ 1002.775184] ? loop_control_ioctl+0x67/0x3f0 [ 1002.779579] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1002.785001] ? __lock_acquire+0x5fc/0x3f20 [ 1002.789258] ? do_wp_page+0x24d/0x1db0 [ 1002.793136] ? finish_mkwrite_fault+0x5e0/0x5e0 [ 1002.797828] loop_control_ioctl+0x67/0x3f0 [ 1002.802050] ? loop_lookup+0x190/0x190 [ 1002.805952] ? vm_insert_page+0x7c0/0x7c0 [ 1002.810084] ? loop_lookup+0x190/0x190 [ 1002.813965] do_vfs_ioctl+0x75a/0xff0 [ 1002.817789] ? ioctl_preallocate+0x1a0/0x1a0 [ 1002.822186] ? lock_downgrade+0x740/0x740 [ 1002.826352] ? security_file_ioctl+0x83/0xb0 [ 1002.830746] SyS_ioctl+0x7f/0xb0 [ 1002.834086] ? do_vfs_ioctl+0xff0/0xff0 [ 1002.838076] do_syscall_64+0x1d5/0x640 [ 1002.841952] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1002.847151] RIP: 0033:0x4416b9 [ 1002.850323] RSP: 002b:00007ffe022346e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 1002.858049] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004416b9 [ 1002.865346] RDX: 0000000000000000 RSI: 0000000000004c82 RDI: 0000000000000003 [ 1002.872612] RBP: 00000000000b973f R08: 0000000000000001 R09: 0000000000000001 [ 1002.879900] R10: 00007ffe02234700 R11: 0000000000000246 R12: 0000000000402350 [ 1002.887213] R13: 00000000004023e0 R14: 0000000000000000 R15: 0000000000000000 [ 1002.894488] [ 1002.894488] Showing all locks held in the system: [ 1002.900839] 1 lock held by khungtaskd/1531: [ 1002.905286] #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a [ 1002.914332] 2 locks held by systemd-udevd/4627: [ 1002.919019] #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_get+0x191/0x1090 [ 1002.927756] #1: (loop_index_mutex){+.+.}, at: [] lo_open+0x19/0xb0 [ 1002.935866] 2 locks held by systemd-udevd/8016: [ 1002.940521] #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_put+0xd8/0x800 [ 1002.949083] #1: (loop_index_mutex){+.+.}, at: [] lo_release+0x1b/0x190 [ 1002.957560] 2 locks held by syz-executor687/8028: [ 1002.962379] #0: (loop_index_mutex){+.+.}, at: [] loop_control_ioctl+0x67/0x3f0 [ 1002.971531] #1: (&lo->lo_ctl_mutex){+.+.}, at: [] loop_control_ioctl+0x181/0x3f0 [ 1002.980856] 2 locks held by syz-executor687/8033: [ 1002.985732] #0: (&lo->lo_ctl_mutex/1){+.+.}, at: [] lo_ioctl+0x87/0x1cd0 [ 1002.994329] #1: (&bdev->bd_mutex){+.+.}, at: [] blkdev_reread_part+0x1b/0x40 [ 1003.003301] 1 lock held by syz-executor687/8037: [ 1003.008092] #0: (loop_index_mutex){+.+.}, at: [] loop_control_ioctl+0x67/0x3f0 [ 1003.017239] 1 lock held by syz-executor687/8038: [ 1003.021995] #0: (loop_index_mutex){+.+.}, at: [] loop_control_ioctl+0x67/0x3f0 [ 1003.031142] 1 lock held by syz-executor687/8045: [ 1003.035927] #0: (loop_index_mutex){+.+.}, at: [] loop_control_ioctl+0x67/0x3f0 [ 1003.045069] 1 lock held by syz-executor687/8046: [ 1003.049808] #0: (loop_index_mutex){+.+.}, at: [] loop_control_ioctl+0x67/0x3f0 [ 1003.058936] [ 1003.060547] ============================================= [ 1003.060547] [ 1003.068011] NMI backtrace for cpu 1 [ 1003.071633] CPU: 1 PID: 1531 Comm: khungtaskd Not tainted 4.14.217-syzkaller #0 [ 1003.079052] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1003.088386] Call Trace: [ 1003.090949] dump_stack+0x1b2/0x281 [ 1003.094551] nmi_cpu_backtrace.cold+0x57/0x93 [ 1003.099020] ? irq_force_complete_move+0x350/0x350 [ 1003.103922] nmi_trigger_cpumask_backtrace+0x13a/0x180 [ 1003.109187] watchdog+0x5b9/0xb40 [ 1003.112613] ? hungtask_pm_notify+0x50/0x50 [ 1003.116907] kthread+0x30d/0x420 [ 1003.120245] ? kthread_create_on_node+0xd0/0xd0 [ 1003.124887] ret_from_fork+0x24/0x30 [ 1003.128637] Sending NMI from CPU 1 to CPUs 0: [ 1003.133172] NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff8720e0fe [ 1003.134132] Kernel panic - not syncing: hung_task: blocked tasks [ 1003.146484] CPU: 1 PID: 1531 Comm: khungtaskd Not tainted 4.14.217-syzkaller #0 [ 1003.153901] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1003.163228] Call Trace: [ 1003.165795] dump_stack+0x1b2/0x281 [ 1003.169396] panic+0x1f9/0x42d [ 1003.172559] ? add_taint.cold+0x16/0x16 [ 1003.176510] watchdog+0x5ca/0xb40 [ 1003.179935] ? hungtask_pm_notify+0x50/0x50 [ 1003.184325] kthread+0x30d/0x420 [ 1003.187680] ? kthread_create_on_node+0xd0/0xd0 [ 1003.192326] ret_from_fork+0x24/0x30 [ 1003.196692] Kernel Offset: disabled [ 1003.200312] Rebooting in 86400 seconds..