[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.139' (ECDSA) to the list of known hosts. executing program executing program executing program syzkaller login: [ 1015.025682] audit: type=1400 audit(1594549589.153:8): avc: denied { execmem } for pid=6349 comm="syz-executor335" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 1288.014023] INFO: task syz-executor335:6357 blocked for more than 140 seconds. [ 1288.021509] Not tainted 4.14.184-syzkaller #0 [ 1288.027852] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1288.035865] syz-executor335 D28832 6357 6355 0x00000004 [ 1288.041528] Call Trace: [ 1288.044300] __schedule+0x8a6/0x1d70 [ 1288.048040] ? firmware_map_remove+0x18f/0x18f [ 1288.052661] ? lock_downgrade+0x6e0/0x6e0 [ 1288.056867] schedule+0x8d/0x1b0 [ 1288.060227] schedule_preempt_disabled+0xf/0x20 [ 1288.064931] __mutex_lock+0x5f0/0x1430 [ 1288.068865] ? __wake_up_common_lock+0xcd/0x140 [ 1288.073533] ? blkdev_reread_part+0x1b/0x40 [ 1288.077890] ? mark_held_locks+0xa6/0xf0 [ 1288.081944] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1288.087426] ? trace_hardirqs_on_caller+0x3a8/0x580 [ 1288.092433] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 1288.097670] ? __wake_up_common_lock+0xcd/0x140 [ 1288.102336] ? blkdev_reread_part+0x1b/0x40 [ 1288.106686] blkdev_reread_part+0x1b/0x40 [ 1288.110865] loop_reread_partitions+0x72/0x80 [ 1288.115384] loop_clr_fd+0x828/0xac0 [ 1288.119091] lo_ioctl+0x89c/0x1c00 [ 1288.122644] ? __check_object_size+0x176/0x229 [ 1288.127284] ? getname_flags+0xc8/0x550 [ 1288.131262] ? loop_clr_fd+0xac0/0xac0 [ 1288.135175] blkdev_ioctl+0x91d/0x17c0 [ 1288.139055] ? blkpg_ioctl+0x8d0/0x8d0 [ 1288.142989] block_ioctl+0xd9/0x120 [ 1288.146697] ? blkdev_fallocate+0x3a0/0x3a0 [ 1288.151027] do_vfs_ioctl+0x75a/0xfe0 [ 1288.155416] ? selinux_parse_skb.constprop.0+0x16c0/0x16c0 [ 1288.161085] ? ioctl_preallocate+0x1a0/0x1a0 [ 1288.165518] ? SyS_fstat+0xd0/0xd0 [ 1288.169095] ? kmem_cache_free+0x23a/0x2b0 [ 1288.173310] ? putname+0xcd/0x110 [ 1288.176834] ? security_file_ioctl+0x76/0xb0 [ 1288.181239] ? security_file_ioctl+0x83/0xb0 [ 1288.185698] SyS_ioctl+0x7f/0xb0 [ 1288.189058] ? do_vfs_ioctl+0xfe0/0xfe0 [ 1288.193014] do_syscall_64+0x1d5/0x640 [ 1288.196934] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1288.202115] RIP: 0033:0x4415a7 [ 1288.205347] RSP: 002b:00007ffdcd66f898 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 1288.213056] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004415a7 [ 1288.220349] RDX: 0000000000000000 RSI: 0000000000004c01 RDI: 0000000000000005 [ 1288.227731] RBP: 0000000000000004 R08: 0000000000000000 R09: 000000000000000c [ 1288.235172] R10: 0000000000000064 R11: 0000000000000246 R12: 0000000000000000 [ 1288.242495] R13: 0000000000000005 R14: 0000000000000000 R15: 0000000000000000 [ 1288.249835] INFO: task syz-executor335:6383 blocked for more than 140 seconds. [ 1288.257304] Not tainted 4.14.184-syzkaller #0 [ 1288.262352] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1288.270344] syz-executor335 D28928 6383 6353 0x00000004 [ 1288.276013] Call Trace: [ 1288.278621] __schedule+0x8a6/0x1d70 [ 1288.282359] ? firmware_map_remove+0x18f/0x18f [ 1288.287474] ? lock_downgrade+0x6e0/0x6e0 [ 1288.291622] schedule+0x8d/0x1b0 [ 1288.295018] schedule_preempt_disabled+0xf/0x20 [ 1288.299676] __mutex_lock+0x5f0/0x1430 [ 1288.303541] ? loop_control_ioctl+0x15b/0x2d0 [ 1288.308071] ? lock_downgrade+0x6e0/0x6e0 [ 1288.312218] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1288.317696] ? wake_up_q+0x90/0xe0 [ 1288.321226] ? __mutex_unlock_slowpath+0x268/0x780 [ 1288.326196] ? loop_control_ioctl+0x15b/0x2d0 [ 1288.330689] loop_control_ioctl+0x15b/0x2d0 [ 1288.335057] ? loop_probe+0x160/0x160 [ 1288.338850] ? selinux_file_ioctl+0x3f7/0x560 [ 1288.343322] ? loop_probe+0x160/0x160 [ 1288.347166] do_vfs_ioctl+0x75a/0xfe0 [ 1288.350985] ? selinux_parse_skb.constprop.0+0x16c0/0x16c0 [ 1288.356641] ? ioctl_preallocate+0x1a0/0x1a0 [ 1288.361060] ? lock_downgrade+0x6e0/0x6e0 [ 1288.365252] ? security_file_ioctl+0x76/0xb0 [ 1288.369658] ? security_file_ioctl+0x83/0xb0 [ 1288.374109] SyS_ioctl+0x7f/0xb0 [ 1288.377481] ? do_vfs_ioctl+0xfe0/0xfe0 [ 1288.381438] do_syscall_64+0x1d5/0x640 [ 1288.385400] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1288.390602] RIP: 0033:0x441699 [ 1288.393851] RSP: 002b:00007ffdcd66fad8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 1288.401576] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441699 [ 1288.408877] RDX: 0000000000000005 RSI: 0000000000004c81 RDI: 0000000000000003 [ 1288.416503] RBP: 00000000000f7d6e R08: 0000000000000001 R09: 0000000000000001 [ 1288.423819] R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000402330 [ 1288.431076] R13: 00000000004023c0 R14: 0000000000000000 R15: 0000000000000000 [ 1288.438418] INFO: task syz-executor335:6385 blocked for more than 140 seconds. [ 1288.445949] Not tainted 4.14.184-syzkaller #0 [ 1288.450957] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1288.458969] syz-executor335 D28928 6385 6354 0x00000004 [ 1288.464650] Call Trace: [ 1288.467234] __schedule+0x8a6/0x1d70 [ 1288.470953] ? firmware_map_remove+0x18f/0x18f [ 1288.475559] ? lock_downgrade+0x6e0/0x6e0 [ 1288.479708] schedule+0x8d/0x1b0 [ 1288.483086] schedule_preempt_disabled+0xf/0x20 [ 1288.487801] __mutex_lock+0x5f0/0x1430 [ 1288.491761] ? wp_page_copy+0xfb6/0x1bc0 [ 1288.495852] ? loop_control_ioctl+0x61/0x2d0 [ 1288.500275] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1288.505794] ? __lock_acquire+0x655/0x42a0 [ 1288.510095] ? debug_check_no_obj_freed+0x27c/0x5fd [ 1288.515159] ? loop_control_ioctl+0x61/0x2d0 [ 1288.519563] loop_control_ioctl+0x61/0x2d0 [ 1288.523846] ? loop_probe+0x160/0x160 [ 1288.527637] ? selinux_file_ioctl+0x3f7/0x560 [ 1288.532126] ? loop_probe+0x160/0x160 [ 1288.535955] do_vfs_ioctl+0x75a/0xfe0 [ 1288.539746] ? selinux_parse_skb.constprop.0+0x16c0/0x16c0 [ 1288.545936] ? ioctl_preallocate+0x1a0/0x1a0 [ 1288.550343] ? lock_downgrade+0x6e0/0x6e0 [ 1288.554514] ? security_file_ioctl+0x76/0xb0 [ 1288.558915] ? security_file_ioctl+0x83/0xb0 [ 1288.563299] SyS_ioctl+0x7f/0xb0 [ 1288.566697] ? do_vfs_ioctl+0xfe0/0xfe0 [ 1288.570677] do_syscall_64+0x1d5/0x640 [ 1288.574599] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1288.579783] RIP: 0033:0x441699 [ 1288.582951] RSP: 002b:00007ffdcd66fad8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 1288.590820] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441699 [ 1288.598137] RDX: 0000000000000000 RSI: 0000000000004c82 RDI: 0000000000000003 [ 1288.605444] RBP: 00000000000f7e7f R08: 0000000000000001 R09: 0000000000000001 [ 1288.612751] R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000402330 [ 1288.620054] R13: 00000000004023c0 R14: 0000000000000000 R15: 0000000000000000 [ 1288.627398] INFO: task syz-executor335:6386 blocked for more than 140 seconds. [ 1288.634791] Not tainted 4.14.184-syzkaller #0 [ 1288.639799] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1288.647791] syz-executor335 D28928 6386 6350 0x00000004 [ 1288.653471] Call Trace: [ 1288.656235] __schedule+0x8a6/0x1d70 [ 1288.659945] ? firmware_map_remove+0x18f/0x18f [ 1288.664561] ? lock_downgrade+0x6e0/0x6e0 [ 1288.668728] schedule+0x8d/0x1b0 [ 1288.672073] schedule_preempt_disabled+0xf/0x20 [ 1288.677300] __mutex_lock+0x5f0/0x1430 [ 1288.681211] ? wp_page_copy+0xfb6/0x1bc0 [ 1288.685297] ? loop_control_ioctl+0x61/0x2d0 [ 1288.689698] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1288.695173] ? __lock_acquire+0x655/0x42a0 [ 1288.699420] ? debug_check_no_obj_freed+0x27c/0x5fd [ 1288.704469] ? loop_control_ioctl+0x61/0x2d0 [ 1288.708879] loop_control_ioctl+0x61/0x2d0 [ 1288.713116] ? loop_probe+0x160/0x160 [ 1288.716954] ? selinux_file_ioctl+0x3f7/0x560 [ 1288.721441] ? loop_probe+0x160/0x160 [ 1288.725285] do_vfs_ioctl+0x75a/0xfe0 [ 1288.729095] ? selinux_parse_skb.constprop.0+0x16c0/0x16c0 [ 1288.734764] ? ioctl_preallocate+0x1a0/0x1a0 [ 1288.739216] ? lock_downgrade+0x6e0/0x6e0 [ 1288.743346] ? security_file_ioctl+0x76/0xb0 [ 1288.747789] ? security_file_ioctl+0x83/0xb0 [ 1288.752199] SyS_ioctl+0x7f/0xb0 [ 1288.755591] ? do_vfs_ioctl+0xfe0/0xfe0 [ 1288.759557] do_syscall_64+0x1d5/0x640 [ 1288.763424] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1288.768636] RIP: 0033:0x441699 [ 1288.771813] RSP: 002b:00007ffdcd66fad8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 1288.779573] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441699 [ 1288.786885] RDX: 0000000000000000 RSI: 0000000000004c82 RDI: 0000000000000003 [ 1288.794186] RBP: 00000000000f7e7f R08: 0000000000000001 R09: 0000000000000001 [ 1288.801446] R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000402330 [ 1288.809392] R13: 00000000004023c0 R14: 0000000000000000 R15: 0000000000000000 [ 1288.816787] INFO: task syz-executor335:6387 blocked for more than 140 seconds. [ 1288.824200] Not tainted 4.14.184-syzkaller #0 [ 1288.829209] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1288.837236] syz-executor335 D28928 6387 6351 0x00000004 [ 1288.842873] Call Trace: [ 1288.845509] __schedule+0x8a6/0x1d70 [ 1288.849368] ? firmware_map_remove+0x18f/0x18f [ 1288.854004] ? lock_downgrade+0x6e0/0x6e0 [ 1288.858152] schedule+0x8d/0x1b0 [ 1288.861513] schedule_preempt_disabled+0xf/0x20 [ 1288.866378] __mutex_lock+0x5f0/0x1430 [ 1288.870268] ? wp_page_copy+0xfb6/0x1bc0 [ 1288.874376] ? loop_control_ioctl+0x61/0x2d0 [ 1288.878785] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1288.884279] ? __lock_acquire+0x655/0x42a0 [ 1288.888647] ? debug_check_no_obj_freed+0x27c/0x5fd [ 1288.893653] ? loop_control_ioctl+0x61/0x2d0 [ 1288.898108] loop_control_ioctl+0x61/0x2d0 [ 1288.902347] ? loop_probe+0x160/0x160 [ 1288.906187] ? selinux_file_ioctl+0x3f7/0x560 [ 1288.910684] ? loop_probe+0x160/0x160 [ 1288.914620] do_vfs_ioctl+0x75a/0xfe0 [ 1288.918416] ? selinux_parse_skb.constprop.0+0x16c0/0x16c0 [ 1288.924219] ? ioctl_preallocate+0x1a0/0x1a0 [ 1288.928641] ? lock_downgrade+0x6e0/0x6e0 [ 1288.932786] ? security_file_ioctl+0x76/0xb0 [ 1288.937725] ? security_file_ioctl+0x83/0xb0 [ 1288.942141] SyS_ioctl+0x7f/0xb0 [ 1288.945535] ? do_vfs_ioctl+0xfe0/0xfe0 [ 1288.949498] do_syscall_64+0x1d5/0x640 [ 1288.953367] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1288.958743] RIP: 0033:0x441699 [ 1288.961931] RSP: 002b:00007ffdcd66fad8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 1288.969684] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441699 [ 1288.977243] RDX: 0000000000000000 RSI: 0000000000004c82 RDI: 0000000000000003 [ 1288.984634] RBP: 00000000000f7eea R08: 0000000000000001 R09: 0000000000000001 [ 1288.991893] R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000402330 [ 1288.999426] R13: 00000000004023c0 R14: 0000000000000000 R15: 0000000000000000 [ 1289.006795] INFO: task systemd-udevd:6389 blocked for more than 140 seconds. [ 1289.014025] Not tainted 4.14.184-syzkaller #0 [ 1289.019363] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1289.027412] systemd-udevd D28752 6389 3643 0x00000104 [ 1289.033045] Call Trace: [ 1289.035682] __schedule+0x8a6/0x1d70 [ 1289.039436] ? firmware_map_remove+0x18f/0x18f [ 1289.044052] ? lock_downgrade+0x6e0/0x6e0 [ 1289.048196] schedule+0x8d/0x1b0 [ 1289.051542] schedule_preempt_disabled+0xf/0x20 [ 1289.056247] __mutex_lock+0x5f0/0x1430 [ 1289.060127] ? __blkdev_get+0x192/0x10c0 [ 1289.064743] ? lo_open+0x19/0xb0 [ 1289.068116] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1289.073606] ? get_disk+0xd0/0xd0 [ 1289.077276] ? exact_match+0x9/0x20 [ 1289.080952] ? kobj_lookup+0x320/0x410 [ 1289.084887] ? blkdev_ioctl+0x17c0/0x17c0 [ 1289.089034] ? loop_unregister_transfer+0x90/0x90 [ 1289.093905] ? lo_open+0x19/0xb0 [ 1289.097266] lo_open+0x19/0xb0 [ 1289.100458] __blkdev_get+0xa70/0x10c0 [ 1289.104421] ? trace_hardirqs_on+0x10/0x10 [ 1289.108653] ? trace_hardirqs_on+0x10/0x10 [ 1289.112867] ? __blkdev_put+0x6a0/0x6a0 [ 1289.116867] ? fsnotify+0x897/0x1110 [ 1289.120574] blkdev_get+0x84/0x8a0 [ 1289.124139] ? bd_may_claim+0xd0/0xd0 [ 1289.127927] ? lock_downgrade+0x6e0/0x6e0 [ 1289.132051] ? selinux_quota_on+0x110/0x110 [ 1289.136521] ? do_raw_spin_unlock+0x164/0x250 [ 1289.141016] ? _raw_spin_unlock+0x29/0x40 [ 1289.145190] blkdev_open+0x1cc/0x250 [ 1289.148897] ? security_file_open+0x82/0x190 [ 1289.153283] do_dentry_open+0x44b/0xec0 [ 1289.157281] ? bd_acquire+0x2c0/0x2c0 [ 1289.161089] vfs_open+0x105/0x220 [ 1289.164570] path_openat+0xb68/0x2aa0 [ 1289.168423] ? path_mountpoint+0x960/0x960 [ 1289.172638] ? trace_hardirqs_on+0x10/0x10 [ 1289.176904] do_filp_open+0x18e/0x250 [ 1289.180697] ? may_open_dev+0xe0/0xe0 [ 1289.184527] ? lock_acquire+0x170/0x3f0 [ 1289.188491] ? lock_downgrade+0x6e0/0x6e0 [ 1289.192635] ? do_raw_spin_unlock+0x164/0x250 [ 1289.197702] ? __alloc_fd+0x1bf/0x490 [ 1289.201506] do_sys_open+0x292/0x3e0 [ 1289.205263] ? filp_open+0x60/0x60 [ 1289.208802] ? do_syscall_64+0x4c/0x640 [ 1289.212772] ? do_sys_open+0x3e0/0x3e0 [ 1289.216703] do_syscall_64+0x1d5/0x640 [ 1289.220582] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1289.225796] RIP: 0033:0x7f82e9f34840 [ 1289.229492] RSP: 002b:00007fff8c468558 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 1289.237222] RAX: ffffffffffffffda RBX: 000055a1c9d032f0 RCX: 00007f82e9f34840 [ 1289.244525] RDX: 000055a1c8fc1fe3 RSI: 00000000000a0800 RDI: 000055a1c9d05040 [ 1289.251783] RBP: 00007fff8c4686d0 R08: 000055a1c8fc1670 R09: 0000000000000010 [ 1289.259081] R10: 000055a1c8fc1d0c R11: 0000000000000246 R12: 00007fff8c468620 [ 1289.266387] R13: 000055a1c9cfc800 R14: 0000000000000003 R15: 000000000000000e [ 1289.273666] INFO: task syz-executor335:6395 blocked for more than 140 seconds. [ 1289.281050] Not tainted 4.14.184-syzkaller #0 [ 1289.286208] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1289.294187] syz-executor335 D28832 6395 6352 0x00000004 [ 1289.299827] Call Trace: [ 1289.302394] __schedule+0x8a6/0x1d70 [ 1289.306134] ? firmware_map_remove+0x18f/0x18f [ 1289.310709] ? lock_downgrade+0x6e0/0x6e0 [ 1289.314880] schedule+0x8d/0x1b0 [ 1289.318253] schedule_preempt_disabled+0xf/0x20 [ 1289.322896] __mutex_lock+0x5f0/0x1430 [ 1289.327346] ? wp_page_copy+0xfb6/0x1bc0 [ 1289.331426] ? loop_control_ioctl+0x61/0x2d0 [ 1289.335864] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1289.341305] ? __lock_acquire+0x655/0x42a0 [ 1289.345561] ? debug_check_no_obj_freed+0x27c/0x5fd [ 1289.350585] ? loop_control_ioctl+0x61/0x2d0 [ 1289.355018] loop_control_ioctl+0x61/0x2d0 [ 1289.359245] ? loop_probe+0x160/0x160 [ 1289.363071] ? selinux_file_ioctl+0x3f7/0x560 [ 1289.367589] ? loop_probe+0x160/0x160 [ 1289.371381] do_vfs_ioctl+0x75a/0xfe0 [ 1289.375208] ? selinux_parse_skb.constprop.0+0x16c0/0x16c0 [ 1289.380843] ? ioctl_preallocate+0x1a0/0x1a0 [ 1289.385280] ? lock_downgrade+0x6e0/0x6e0 [ 1289.389423] ? security_file_ioctl+0x76/0xb0 [ 1289.393866] ? security_file_ioctl+0x83/0xb0 [ 1289.398291] SyS_ioctl+0x7f/0xb0 [ 1289.401632] ? do_vfs_ioctl+0xfe0/0xfe0 [ 1289.405632] do_syscall_64+0x1d5/0x640 [ 1289.409514] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1289.414725] RIP: 0033:0x441699 [ 1289.417926] RSP: 002b:00007ffdcd66fad8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 1289.425684] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441699 [ 1289.432956] RDX: 0000000000000000 RSI: 0000000000004c82 RDI: 0000000000000003 [ 1289.440345] RBP: 00000000000f7ff3 R08: 0000000000000001 R09: 0000000000000001 [ 1289.447677] R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000402330 [ 1289.455405] R13: 00000000004023c0 R14: 0000000000000000 R15: 0000000000000000 [ 1289.462699] [ 1289.462699] Showing all locks held in the system: [ 1289.469071] 1 lock held by khungtaskd/1057: [ 1289.473474] #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a [ 1289.482587] 2 locks held by syz-executor335/6357: [ 1289.487471] #0: (&lo->lo_ctl_mutex/1){+.+.}, at: [] lo_ioctl+0x87/0x1c00 [ 1289.496122] #1: (&bdev->bd_mutex){+.+.}, at: [] blkdev_reread_part+0x1b/0x40 [ 1289.505106] 2 locks held by syz-executor335/6383: [ 1289.509947] #0: (loop_index_mutex){+.+.}, at: [] loop_control_ioctl+0x61/0x2d0 [ 1289.519120] #1: (&lo->lo_ctl_mutex){+.+.}, at: [] loop_control_ioctl+0x15b/0x2d0 [ 1289.528508] 1 lock held by syz-executor335/6385: [ 1289.533246] #0: (loop_index_mutex){+.+.}, at: [] loop_control_ioctl+0x61/0x2d0 [ 1289.542403] 1 lock held by syz-executor335/6386: [ 1289.547196] #0: (loop_index_mutex){+.+.}, at: [] loop_control_ioctl+0x61/0x2d0 [ 1289.556349] 1 lock held by syz-executor335/6387: [ 1289.561119] #0: (loop_index_mutex){+.+.}, at: [] loop_control_ioctl+0x61/0x2d0 [ 1289.570267] 2 locks held by systemd-udevd/6389: [ 1289.574979] #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_get+0x192/0x10c0 [ 1289.583650] #1: (loop_index_mutex){+.+.}, at: [] lo_open+0x19/0xb0 [ 1289.591794] 1 lock held by syz-executor335/6395: [ 1289.596590] #0: (loop_index_mutex){+.+.}, at: [] loop_control_ioctl+0x61/0x2d0 [ 1289.605740] [ 1289.607351] ============================================= [ 1289.607351] [ 1289.615026] NMI backtrace for cpu 1 [ 1289.618657] CPU: 1 PID: 1057 Comm: khungtaskd Not tainted 4.14.184-syzkaller #0 [ 1289.626078] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1289.635459] Call Trace: [ 1289.638184] dump_stack+0x1b2/0x283 [ 1289.641793] nmi_cpu_backtrace.cold+0x57/0x93 [ 1289.646318] ? irq_force_complete_move.cold+0x7b/0x7b [ 1289.651482] nmi_trigger_cpumask_backtrace+0x13a/0x17f [ 1289.656799] watchdog+0x5e2/0xb80 [ 1289.660286] ? hungtask_pm_notify+0x50/0x50 [ 1289.664586] kthread+0x30d/0x420 [ 1289.667925] ? kthread_create_on_node+0xd0/0xd0 [ 1289.672569] ret_from_fork+0x24/0x30 [ 1289.676412] Sending NMI from CPU 1 to CPUs 0: [ 1289.680950] NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff863e461e [ 1289.681909] Kernel panic - not syncing: hung_task: blocked tasks [ 1289.694269] CPU: 1 PID: 1057 Comm: khungtaskd Not tainted 4.14.184-syzkaller #0 [ 1289.701806] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1289.711138] Call Trace: [ 1289.713714] dump_stack+0x1b2/0x283 [ 1289.717321] panic+0x1f9/0x42d [ 1289.720488] ? add_taint.cold+0x16/0x16 [ 1289.724437] ? irq_force_complete_move.cold+0x7b/0x7b [ 1289.729607] watchdog+0x5f3/0xb80 [ 1289.733035] ? hungtask_pm_notify+0x50/0x50 [ 1289.737347] kthread+0x30d/0x420 [ 1289.740693] ? kthread_create_on_node+0xd0/0xd0 [ 1289.745336] ret_from_fork+0x24/0x30 [ 1289.750452] Kernel Offset: disabled [ 1289.754108] Rebooting in 86400 seconds..