[ 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 '10.128.0.47' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 595.942809][ T1133] INFO: task syz-executor670:7187 blocked for more than 143 seconds. [ 595.942831][ T1133] Not tainted 5.6.0-rc7-syzkaller #0 [ 595.942836][ T1133] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 595.942843][ T1133] syz-executor670 D28328 7187 7183 0x00004004 [ 595.942866][ T1133] Call Trace: [ 595.943001][ T1133] ? __schedule+0x934/0x1f90 [ 595.943028][ T1133] ? __sched_text_start+0x8/0x8 [ 595.943059][ T1133] schedule+0xd0/0x2a0 [ 595.943078][ T1133] schedule_preempt_disabled+0xf/0x20 [ 595.943136][ T1133] __mutex_lock+0x7ab/0x13c0 [ 595.943205][ T1133] ? fb_open+0xd3/0x430 [ 595.943228][ T1133] ? mutex_trylock+0x2c0/0x2c0 [ 595.943251][ T1133] ? __mutex_unlock_slowpath+0xe2/0x660 [ 595.943309][ T1133] ? chrdev_open+0xc4/0x5c0 [ 595.943363][ T1133] ? lock_downgrade+0x7f0/0x7f0 [ 595.943393][ T1133] ? fb_open+0xd3/0x430 [ 595.943442][ T1133] fb_open+0xd3/0x430 [ 595.943459][ T1133] ? get_fb_info.part.0+0x80/0x80 [ 595.943472][ T1133] chrdev_open+0x219/0x5c0 [ 595.943487][ T1133] ? rwlock_bug.part.0+0x90/0x90 [ 595.943502][ T1133] ? cdev_put.part.0+0x50/0x50 [ 595.943559][ T1133] do_dentry_open+0x4a2/0x1250 [ 595.943576][ T1133] ? cdev_put.part.0+0x50/0x50 [ 595.943655][ T1133] ? security_inode_permission+0xc4/0xf0 [ 595.943670][ T1133] ? chown_common+0x550/0x550 [ 595.943713][ T1133] ? inode_permission+0xab/0x500 [ 595.943740][ T1133] path_openat+0x122a/0x32b0 [ 595.943776][ T1133] ? path_mountpoint.isra.0+0x370/0x370 [ 595.943788][ T1133] ? __lock_acquire+0x14bd/0x3ca0 [ 595.943808][ T1133] ? __lock_acquire+0x14bd/0x3ca0 [ 595.943837][ T1133] do_filp_open+0x192/0x260 [ 595.943854][ T1133] ? may_open_dev+0xf0/0xf0 [ 595.943883][ T1133] ? do_raw_spin_lock+0x129/0x2e0 [ 595.943914][ T1133] ? _raw_spin_unlock+0x24/0x40 [ 595.943936][ T1133] ? __alloc_fd+0x46d/0x600 [ 595.943965][ T1133] do_sys_openat2+0x54c/0x740 [ 595.943985][ T1133] ? file_open_root+0x3d0/0x3d0 [ 595.944064][ T1133] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 595.944087][ T1133] do_sys_open+0xc3/0x140 [ 595.944102][ T1133] ? filp_open+0x70/0x70 [ 595.944147][ T1133] ? fpregs_mark_activate+0x320/0x320 [ 595.944220][ T1133] ? trace_hardirqs_off_caller+0x55/0x230 [ 595.944281][ T1133] do_syscall_64+0xf6/0x7d0 [ 595.944301][ T1133] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 595.944312][ T1133] RIP: 0033:0x441419 [ 595.944356][ T1133] Code: Bad RIP value. [ 595.944364][ T1133] RSP: 002b:00007ffc34b68778 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 [ 595.944376][ T1133] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441419 [ 595.944385][ T1133] RDX: 0000000000002041 RSI: 00000000200000c0 RDI: ffffffffffffff9c [ 595.944393][ T1133] RBP: 00000000006cb018 R08: 0000000000000004 R09: 00000000004002c8 [ 595.944401][ T1133] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402190 [ 595.944413][ T1133] R13: 0000000000402220 R14: 0000000000000000 R15: 0000000000000000 [ 595.944451][ T1133] INFO: task syz-executor670:7188 blocked for more than 143 seconds. [ 595.944459][ T1133] Not tainted 5.6.0-rc7-syzkaller #0 [ 595.944464][ T1133] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 595.944470][ T1133] syz-executor670 D28096 7188 7186 0x00004004 [ 595.944490][ T1133] Call Trace: [ 595.944512][ T1133] ? __schedule+0x934/0x1f90 [ 595.944537][ T1133] ? __sched_text_start+0x8/0x8 [ 595.944568][ T1133] schedule+0xd0/0x2a0 [ 595.944586][ T1133] schedule_preempt_disabled+0xf/0x20 [ 595.944600][ T1133] __mutex_lock+0x7ab/0x13c0 [ 595.944617][ T1133] ? fb_open+0xd3/0x430 [ 595.944640][ T1133] ? mutex_trylock+0x2c0/0x2c0 [ 595.944663][ T1133] ? __mutex_unlock_slowpath+0xe2/0x660 [ 595.944675][ T1133] ? chrdev_open+0xc4/0x5c0 [ 595.944697][ T1133] ? lock_downgrade+0x7f0/0x7f0 [ 595.944739][ T1133] ? fb_open+0xd3/0x430 [ 595.944749][ T1133] fb_open+0xd3/0x430 [ 595.944767][ T1133] ? get_fb_info.part.0+0x80/0x80 [ 595.944779][ T1133] chrdev_open+0x219/0x5c0 [ 595.944794][ T1133] ? rwlock_bug.part.0+0x90/0x90 [ 595.944808][ T1133] ? cdev_put.part.0+0x50/0x50 [ 595.944839][ T1133] do_dentry_open+0x4a2/0x1250 [ 595.944856][ T1133] ? cdev_put.part.0+0x50/0x50 [ 595.944874][ T1133] ? security_inode_permission+0xc4/0xf0 [ 595.944889][ T1133] ? chown_common+0x550/0x550 [ 595.944902][ T1133] ? inode_permission+0xab/0x500 [ 595.944928][ T1133] path_openat+0x122a/0x32b0 [ 595.944964][ T1133] ? path_mountpoint.isra.0+0x370/0x370 [ 595.944976][ T1133] ? __lock_acquire+0x14bd/0x3ca0 [ 595.944996][ T1133] ? __lock_acquire+0x14bd/0x3ca0 [ 595.945025][ T1133] do_filp_open+0x192/0x260 [ 595.945041][ T1133] ? may_open_dev+0xf0/0xf0 [ 595.945070][ T1133] ? do_raw_spin_lock+0x129/0x2e0 [ 595.945102][ T1133] ? _raw_spin_unlock+0x24/0x40 [ 595.945115][ T1133] ? __alloc_fd+0x46d/0x600 [ 595.945145][ T1133] do_sys_openat2+0x54c/0x740 [ 595.945164][ T1133] ? file_open_root+0x3d0/0x3d0 [ 595.945189][ T1133] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 595.945211][ T1133] do_sys_open+0xc3/0x140 [ 595.945225][ T1133] ? filp_open+0x70/0x70 [ 595.945243][ T1133] ? fpregs_mark_activate+0x320/0x320 [ 595.945259][ T1133] ? trace_hardirqs_off_caller+0x55/0x230 [ 595.945286][ T1133] do_syscall_64+0xf6/0x7d0 [ 595.945305][ T1133] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 595.945314][ T1133] RIP: 0033:0x441419 [ 595.945327][ T1133] Code: Bad RIP value. [ 595.945334][ T1133] RSP: 002b:00007ffc34b68778 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 [ 595.945346][ T1133] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441419 [ 595.945354][ T1133] RDX: 0000000000002041 RSI: 00000000200000c0 RDI: ffffffffffffff9c [ 595.945362][ T1133] RBP: 00000000006cb018 R08: 0000000000000004 R09: 00000000004002c8 [ 595.945370][ T1133] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402190 [ 595.945377][ T1133] R13: 0000000000402220 R14: 0000000000000000 R15: 0000000000000000 [ 595.945418][ T1133] INFO: task syz-executor670:7189 blocked for more than 143 seconds. [ 595.945425][ T1133] Not tainted 5.6.0-rc7-syzkaller #0 [ 595.945430][ T1133] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 595.945436][ T1133] syz-executor670 D28328 7189 7185 0x00004004 [ 595.945457][ T1133] Call Trace: [ 595.945477][ T1133] ? __schedule+0x934/0x1f90 [ 595.945501][ T1133] ? __sched_text_start+0x8/0x8 [ 595.945532][ T1133] schedule+0xd0/0x2a0 [ 595.945550][ T1133] schedule_preempt_disabled+0xf/0x20 [ 595.945563][ T1133] __mutex_lock+0x7ab/0x13c0 [ 595.945581][ T1133] ? fb_open+0xd3/0x430 [ 595.945604][ T1133] ? mutex_trylock+0x2c0/0x2c0 [ 595.945626][ T1133] ? __mutex_unlock_slowpath+0xe2/0x660 [ 595.945638][ T1133] ? chrdev_open+0xc4/0x5c0 [ 595.945660][ T1133] ? lock_downgrade+0x7f0/0x7f0 [ 595.945687][ T1133] ? fb_open+0xd3/0x430 [ 595.945698][ T1133] fb_open+0xd3/0x430 [ 595.945715][ T1133] ? get_fb_info.part.0+0x80/0x80 [ 595.945727][ T1133] chrdev_open+0x219/0x5c0 [ 595.945741][ T1133] ? rwlock_bug.part.0+0x90/0x90 [ 595.945756][ T1133] ? cdev_put.part.0+0x50/0x50 [ 595.945786][ T1133] do_dentry_open+0x4a2/0x1250 [ 595.945804][ T1133] ? cdev_put.part.0+0x50/0x50 [ 595.945822][ T1133] ? security_inode_permission+0xc4/0xf0 [ 595.945836][ T1133] ? chown_common+0x550/0x550 [ 595.945850][ T1133] ? inode_permission+0xab/0x500 [ 595.945876][ T1133] path_openat+0x122a/0x32b0 [ 595.945912][ T1133] ? path_mountpoint.isra.0+0x370/0x370 [ 595.945924][ T1133] ? __lock_acquire+0x14bd/0x3ca0 [ 595.945944][ T1133] ? __lock_acquire+0x14bd/0x3ca0 [ 595.945973][ T1133] do_filp_open+0x192/0x260 [ 595.945990][ T1133] ? may_open_dev+0xf0/0xf0 [ 595.946019][ T1133] ? do_raw_spin_lock+0x129/0x2e0 [ 595.946050][ T1133] ? _raw_spin_unlock+0x24/0x40 [ 595.946064][ T1133] ? __alloc_fd+0x46d/0x600 [ 595.946093][ T1133] do_sys_openat2+0x54c/0x740 [ 595.946112][ T1133] ? file_open_root+0x3d0/0x3d0 [ 595.946137][ T1133] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 595.946158][ T1133] do_sys_open+0xc3/0x140 [ 595.946173][ T1133] ? filp_open+0x70/0x70 [ 595.946190][ T1133] ? fpregs_mark_activate+0x320/0x320 [ 595.946207][ T1133] ? trace_hardirqs_off_caller+0x55/0x230 [ 595.946233][ T1133] do_syscall_64+0xf6/0x7d0 [ 595.946252][ T1133] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 595.946261][ T1133] RIP: 0033:0x441419 [ 595.946274][ T1133] Code: Bad RIP value. [ 595.946281][ T1133] RSP: 002b:00007ffc34b68778 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 [ 595.946293][ T1133] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441419 [ 595.946301][ T1133] RDX: 0000000000002041 RSI: 00000000200000c0 RDI: ffffffffffffff9c [ 595.946309][ T1133] RBP: 00000000006cb018 R08: 0000000000000004 R09: 00000000004002c8 [ 595.946317][ T1133] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402190 [ 595.946324][ T1133] R13: 0000000000402220 R14: 0000000000000000 R15: 0000000000000000 [ 595.946372][ T1133] INFO: task syz-executor670:7190 blocked for more than 143 seconds. [ 595.946379][ T1133] Not tainted 5.6.0-rc7-syzkaller #0 [ 595.946384][ T1133] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 595.946390][ T1133] syz-executor670 D28328 7190 7181 0x00004004 [ 595.946412][ T1133] Call Trace: [ 595.946433][ T1133] ? __schedule+0x934/0x1f90 [ 595.946459][ T1133] ? __sched_text_start+0x8/0x8 [ 595.946489][ T1133] schedule+0xd0/0x2a0 [ 595.946507][ T1133] schedule_preempt_disabled+0xf/0x20 [ 595.946520][ T1133] __mutex_lock+0x7ab/0x13c0 [ 595.946538][ T1133] ? fb_open+0xd3/0x430 [ 595.946560][ T1133] ? mutex_trylock+0x2c0/0x2c0 [ 595.946583][ T1133] ? __mutex_unlock_slowpath+0xe2/0x660 [ 595.946596][ T1133] ? chrdev_open+0xc4/0x5c0 [ 595.946617][ T1133] ? lock_downgrade+0x7f0/0x7f0 [ 595.946644][ T1133] ? fb_open+0xd3/0x430 [ 595.946655][ T1133] fb_open+0xd3/0x430 [ 595.946672][ T1133] ? get_fb_info.part.0+0x80/0x80 [ 595.946684][ T1133] chrdev_open+0x219/0x5c0 [ 595.946699][ T1133] ? rwlock_bug.part.0+0x90/0x90 [ 595.946713][ T1133] ? cdev_put.part.0+0x50/0x50 [ 595.946743][ T1133] do_dentry_open+0x4a2/0x1250 [ 595.946760][ T1133] ? cdev_put.part.0+0x50/0x50 [ 595.946779][ T1133] ? security_inode_permission+0xc4/0xf0 [ 595.946799][ T1133] ? chown_common+0x550/0x550 [ 595.946813][ T1133] ? inode_permission+0xab/0x500 [ 595.946839][ T1133] path_openat+0x122a/0x32b0 [ 595.946876][ T1133] ? path_mountpoint.isra.0+0x370/0x370 [ 595.946897][ T1133] ? __lock_acquire+0x14bd/0x3ca0 [ 595.946925][ T1133] do_filp_open+0x192/0x260 [ 595.946942][ T1133] ? may_open_dev+0xf0/0xf0 [ 595.946971][ T1133] ? do_raw_spin_lock+0x129/0x2e0 [ 595.947002][ T1133] ? _raw_spin_unlock+0x24/0x40 [ 595.947015][ T1133] ? __alloc_fd+0x46d/0x600 [ 595.947044][ T1133] do_sys_openat2+0x54c/0x740 [ 595.947064][ T1133] ? file_open_root+0x3d0/0x3d0 [ 595.947088][ T1133] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 595.947110][ T1133] do_sys_open+0xc3/0x140 [ 595.947124][ T1133] ? filp_open+0x70/0x70 [ 595.947142][ T1133] ? fpregs_mark_activate+0x320/0x320 [ 595.947158][ T1133] ? trace_hardirqs_off_caller+0x55/0x230 [ 595.947185][ T1133] do_syscall_64+0xf6/0x7d0 [ 595.947204][ T1133] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 595.947212][ T1133] RIP: 0033:0x441419 [ 595.947225][ T1133] Code: Bad RIP value. [ 595.947232][ T1133] RSP: 002b:00007ffc34b68778 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 [ 595.947244][ T1133] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441419 [ 595.947253][ T1133] RDX: 0000000000002041 RSI: 00000000200000c0 RDI: ffffffffffffff9c [ 595.947260][ T1133] RBP: 00000000006cb018 R08: 0000000000000004 R09: 00000000004002c8 [ 595.947268][ T1133] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402190 [ 595.947276][ T1133] R13: 0000000000402220 R14: 0000000000000000 R15: 0000000000000000 [ 595.947311][ T1133] INFO: task syz-executor670:7191 blocked for more than 143 seconds. [ 595.947319][ T1133] Not tainted 5.6.0-rc7-syzkaller #0 [ 595.947324][ T1133] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 595.947329][ T1133] syz-executor670 D28328 7191 7184 0x00000004 [ 595.947347][ T1133] Call Trace: [ 595.947368][ T1133] ? __schedule+0x934/0x1f90 [ 595.947393][ T1133] ? __sched_text_start+0x8/0x8 [ 595.947429][ T1133] schedule+0xd0/0x2a0 [ 595.947448][ T1133] schedule_preempt_disabled+0xf/0x20 [ 595.947461][ T1133] __mutex_lock+0x7ab/0x13c0 [ 595.947478][ T1133] ? fb_open+0xd3/0x430 [ 595.947501][ T1133] ? mutex_trylock+0x2c0/0x2c0 [ 595.947523][ T1133] ? __mutex_unlock_slowpath+0xe2/0x660 [ 595.947536][ T1133] ? chrdev_open+0xc4/0x5c0 [ 595.947558][ T1133] ? lock_downgrade+0x7f0/0x7f0 [ 595.947585][ T1133] ? fb_open+0xd3/0x430 [ 595.947595][ T1133] fb_open+0xd3/0x430 [ 595.947612][ T1133] ? get_fb_info.part.0+0x80/0x80 [ 595.947625][ T1133] chrdev_open+0x219/0x5c0 [ 595.947639][ T1133] ? rwlock_bug.part.0+0x90/0x90 [ 595.947654][ T1133] ? cdev_put.part.0+0x50/0x50 [ 595.947684][ T1133] do_dentry_open+0x4a2/0x1250 [ 595.947701][ T1133] ? cdev_put.part.0+0x50/0x50 [ 595.947720][ T1133] ? security_inode_permission+0xc4/0xf0 [ 595.947734][ T1133] ? chown_common+0x550/0x550 [ 595.947748][ T1133] ? inode_permission+0xab/0x500 [ 595.947774][ T1133] path_openat+0x122a/0x32b0 [ 595.947810][ T1133] ? path_mountpoint.isra.0+0x370/0x370 [ 595.947822][ T1133] ? __lock_acquire+0x14bd/0x3ca0 [ 595.947842][ T1133] ? __lock_acquire+0x14bd/0x3ca0 [ 595.947871][ T1133] do_filp_open+0x192/0x260 [ 595.947888][ T1133] ? may_open_dev+0xf0/0xf0 [ 595.947916][ T1133] ? do_raw_spin_lock+0x129/0x2e0 [ 595.947947][ T1133] ? _raw_spin_unlock+0x24/0x40 [ 595.947960][ T1133] ? __alloc_fd+0x46d/0x600 [ 595.947989][ T1133] do_sys_openat2+0x54c/0x740 [ 595.948009][ T1133] ? file_open_root+0x3d0/0x3d0 [ 595.948034][ T1133] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 595.948055][ T1133] do_sys_open+0xc3/0x140 [ 595.948082][ T1133] ? filp_open+0x70/0x70 [ 595.948100][ T1133] ? fpregs_mark_activate+0x320/0x320 [ 595.948116][ T1133] ? trace_hardirqs_off_caller+0x55/0x230 [ 595.948143][ T1133] do_syscall_64+0xf6/0x7d0 [ 595.948162][ T1133] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 595.948171][ T1133] RIP: 0033:0x441419 [ 595.948183][ T1133] Code: Bad RIP value. [ 595.948191][ T1133] RSP: 002b:00007ffc34b68778 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 [ 595.948202][ T1133] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441419 [ 595.948211][ T1133] RDX: 0000000000002041 RSI: 00000000200000c0 RDI: ffffffffffffff9c [ 595.948218][ T1133] RBP: 00000000006cb018 R08: 0000000000000004 R09: 00000000004002c8 [ 595.948226][ T1133] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402190 [ 595.948234][ T1133] R13: 0000000000402220 R14: 0000000000000000 R15: 0000000000000000 [ 595.948266][ T1133] [ 595.948266][ T1133] Showing all locks held in the system: [ 595.948279][ T1133] 1 lock held by khungtaskd/1133: [ 595.948284][ T1133] #0: ffffffff897accc0 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x260 [ 595.948339][ T1133] 1 lock held by in:imklog/6772: [ 595.948344][ T1133] #0: ffff8880909c0120 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xe3/0x100 [ 595.948375][ T1133] 2 locks held by syz-executor670/7182: [ 595.948384][ T1133] 1 lock held by syz-executor670/7187: [ 595.948388][ T1133] #0: ffff88821973f070 (&fb_info->lock){+.+.}, at: fb_open+0xd3/0x430 [ 595.948420][ T1133] 1 lock held by syz-executor670/7188: [ 595.948424][ T1133] #0: ffff88821973f070 (&fb_info->lock){+.+.}, at: fb_open+0xd3/0x430 [ 595.948450][ T1133] 1 lock held by syz-executor670/7189: [ 595.948454][ T1133] #0: ffff88821973f070 (&fb_info->lock){+.+.}, at: fb_open+0xd3/0x430 [ 595.948480][ T1133] 1 lock held by syz-executor670/7190: [ 595.948485][ T1133] #0: ffff88821973f070 (&fb_info->lock){+.+.}, at: fb_open+0xd3/0x430 [ 595.948510][ T1133] 1 lock held by syz-executor670/7191: [ 595.948515][ T1133] #0: ffff88821973f070 (&fb_info->lock){+.+.}, at: fb_open+0xd3/0x430 [ 595.948537][ T1133] [ 595.948542][ T1133] ============================================= [ 595.948542][ T1133] [ 595.948549][ T1133] NMI backtrace for cpu 1 [ 595.948561][ T1133] CPU: 1 PID: 1133 Comm: khungtaskd Not tainted 5.6.0-rc7-syzkaller #0 [ 595.948568][ T1133] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 595.948572][ T1133] Call Trace: [ 595.948666][ T1133] dump_stack+0x188/0x20d [ 595.948689][ T1133] nmi_cpu_backtrace.cold+0x70/0xb1 [ 595.948750][ T1133] ? lapic_can_unplug_cpu.cold+0x3b/0x3b [ 595.948766][ T1133] nmi_trigger_cpumask_backtrace+0x231/0x27e [ 595.948839][ T1133] watchdog+0xa8c/0x1010 [ 595.948864][ T1133] ? reset_hung_task_detector+0x30/0x30 [ 595.948911][ T1133] kthread+0x357/0x430 [ 595.948924][ T1133] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 595.948941][ T1133] ret_from_fork+0x24/0x30 [ 595.948975][ T1133] Sending NMI from CPU 1 to CPUs 0: [ 595.949994][ C0] NMI backtrace for cpu 0 [ 595.949999][ C0] CPU: 0 PID: 7182 Comm: syz-executor670 Not tainted 5.6.0-rc7-syzkaller #0 [ 595.950003][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 595.950007][ C0] RIP: 0010:__sanitizer_cov_trace_pc+0x1a/0x50 [ 595.950015][ C0] Code: c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 65 48 8b 04 25 c0 1e 02 00 65 8b 15 58 f9 8f 7e 81 e2 00 01 1f 00 48 8b 34 24 <75> 2b 8b 90 80 13 00 00 83 fa 02 75 20 48 8b 88 88 13 00 00 8b 80 [ 595.950018][ C0] RSP: 0018:ffffc90001abf068 EFLAGS: 00000246 [ 595.950024][ C0] RAX: ffff88809b9f8440 RBX: 0000000000000050 RCX: ffffffff83b77f8a [ 595.950027][ C0] RDX: 0000000000000000 RSI: ffffffff83b77f76 RDI: 0000000000000004 [ 595.950031][ C0] RBP: 0000000000000012 R08: ffff88809b9f8440 R09: ffffed1043186d54 [ 595.950035][ C0] R10: ffffed1043186d53 R11: ffff888218c36a9f R12: ffff8880000a0012 [ 595.950039][ C0] R13: ffff8880000a0000 R14: 0000000000000000 R15: 00000000edf6311e [ 595.950043][ C0] FS: 0000000001b39880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 595.950046][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 595.950050][ C0] CR2: 00000000200000c8 CR3: 000000009e474000 CR4: 00000000001406f0 [ 595.950053][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 595.950057][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 595.950059][ C0] Call Trace: [ 595.950062][ C0] vga16fb_fillrect+0x9c6/0x1960 [ 595.950064][ C0] ? memcpy+0x35/0x50 [ 595.950066][ C0] bit_clear_margins+0x2d5/0x4a0 [ 595.950069][ C0] ? bit_bmove+0x210/0x210 [ 595.950071][ C0] ? vesafb_probe.cold+0x1162/0x1162 [ 595.950074][ C0] fbcon_clear_margins+0x1de/0x240 [ 595.950076][ C0] fbcon_switch+0xd1b/0x1740 [ 595.950079][ C0] ? fbcon_set_def_font+0x370/0x370 [ 595.950081][ C0] ? fbcon_cursor+0x477/0x650 [ 595.950084][ C0] ? bit_clear+0x4e0/0x4e0 [ 595.950086][ C0] ? is_console_locked+0x5/0x10 [ 595.950089][ C0] ? fbcon_set_origin+0x26/0x50 [ 595.950091][ C0] redraw_screen+0x2a8/0x770 [ 595.950094][ C0] ? vesafb_probe.cold+0x1162/0x1162 [ 595.950096][ C0] ? respond_string+0x290/0x290 [ 595.950099][ C0] ? fbcon_set_palette+0x3b1/0x4a0 [ 595.950101][ C0] fbcon_modechanged+0x5bd/0x780 [ 595.950104][ C0] fbcon_update_vcs+0x3a/0x50 [ 595.950106][ C0] fb_set_var+0xad0/0xd40 [ 595.950108][ C0] ? fb_blank+0x190/0x190 [ 595.950111][ C0] ? find_held_lock+0x2d/0x110 [ 595.950114][ C0] ? stack_depot_save+0x252/0x440 [ 595.950116][ C0] ? vga16fb_imageblit+0xc49/0x2210 [ 595.950119][ C0] ? bit_cursor+0xa62/0x1900 [ 595.950121][ C0] ? fb_videomode_to_var+0xf/0x610 [ 595.950124][ C0] fbcon_switch+0x520/0x1740 [ 595.950126][ C0] ? fbcon_set_def_font+0x370/0x370 [ 595.950129][ C0] ? fbcon_cursor+0x477/0x650 [ 595.950131][ C0] ? bit_clear+0x4e0/0x4e0 [ 595.950134][ C0] ? is_console_locked+0x5/0x10 [ 595.950136][ C0] ? fbcon_set_origin+0x26/0x50 [ 595.950139][ C0] redraw_screen+0x2a8/0x770 [ 595.950141][ C0] ? vesafb_probe.cold+0x1162/0x1162 [ 595.950144][ C0] ? respond_string+0x290/0x290 [ 595.950146][ C0] ? fbcon_set_palette+0x3b1/0x4a0 [ 595.950149][ C0] fbcon_modechanged+0x5bd/0x780 [ 595.950151][ C0] fbcon_update_vcs+0x3a/0x50 [ 595.950154][ C0] fb_set_var+0xad0/0xd40 [ 595.950156][ C0] ? fb_blank+0x190/0x190 [ 595.950158][ C0] ? do_fb_ioctl+0x348/0x7d0 [ 595.950161][ C0] ? lock_acquire+0x197/0x420 [ 595.950163][ C0] ? do_fb_ioctl+0x335/0x7d0 [ 595.950166][ C0] do_fb_ioctl+0x390/0x7d0 [ 595.950168][ C0] ? fb_mmap+0x550/0x550 [ 595.950171][ C0] ? tomoyo_execute_permission+0x470/0x470 [ 595.950174][ C0] ? do_wp_page+0x50b/0x13c0 [ 595.950177][ C0] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 595.950179][ C0] ? do_vfs_ioctl+0x506/0x12c0 [ 595.950181][ C0] ? up_read+0x1ab/0x750 [ 595.950184][ C0] ? mark_held_locks+0x9f/0xe0 [ 595.950186][ C0] fb_ioctl+0xdd/0x130 [ 595.950189][ C0] ? do_fb_ioctl+0x7d0/0x7d0 [ 595.950191][ C0] ksys_ioctl+0x11a/0x180 [ 595.950193][ C0] __x64_sys_ioctl+0x6f/0xb0 [ 595.950196][ C0] ? lockdep_hardirqs_on+0x417/0x5d0 [ 595.950198][ C0] do_syscall_64+0xf6/0x7d0 [ 595.950201][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 595.950204][ C0] RIP: 0033:0x441419 [ 595.950212][ C0] Code: e8 ac e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 595.950215][ C0] RSP: 002b:00007ffc34b68778 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 595.950221][ C0] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441419 [ 595.950225][ C0] RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000003 [ 595.950229][ C0] RBP: 00000000006cb018 R08: 00000000004002c8 R09: 00000000004002c8 [ 595.950232][ C0] R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000402190 [ 595.950236][ C0] R13: 0000000000402220 R14: 0000000000000000 R15: 0000000000000000 [ 595.950247][ T1133] Kernel panic - not syncing: hung_task: blocked tasks [ 595.950259][ T1133] CPU: 1 PID: 1133 Comm: khungtaskd Not tainted 5.6.0-rc7-syzkaller #0 [ 595.950267][ T1133] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 595.950270][ T1133] Call Trace: [ 595.950284][ T1133] dump_stack+0x188/0x20d [ 595.950343][ T1133] panic+0x2e3/0x75c [ 595.950355][ T1133] ? add_taint.cold+0x16/0x16 [ 595.950371][ T1133] ? cpumask_next+0x3c/0x40 [ 595.950383][ T1133] ? printk_safe_flush+0xd9/0x120 [ 595.950394][ T1133] ? watchdog+0xa8c/0x1010 [ 595.950411][ T1133] ? nmi_trigger_cpumask_backtrace+0x214/0x27e [ 595.950428][ T1133] watchdog+0xa9d/0x1010 [ 595.950448][ T1133] ? reset_hung_task_detector+0x30/0x30 [ 595.950460][ T1133] kthread+0x357/0x430 [ 595.950471][ T1133] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 595.950484][ T1133] ret_from_fork+0x24/0x30 [ 595.952244][ T1133] Kernel Offset: disabled [ 598.158726][ T1133] Rebooting in 86400 seconds..