[[0;32m OK [0m] Reached target Graphical Interface.
Starting Update UTMP about System Runlevel Changes...
[[0;32m OK [0m] Started Update UTMP about System Runlevel Changes.
Starting Load/Save RF Kill Switch Status...
[[0;32m OK [0m] Started Load/Save RF Kill Switch Status.
Debian GNU/Linux 9 syzkaller ttyS0
Warning: Permanently added '10.128.0.38' (ECDSA) to the list of known hosts.
executing program
executing program
executing program
executing program
executing program
executing program
syzkaller login: [ 596.020626][ T1131] INFO: task syz-executor672:7039 blocked for more than 143 seconds.
[ 596.020646][ T1131] Not tainted 5.6.0-syzkaller #0
[ 596.020652][ T1131] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 596.020659][ T1131] syz-executor672 D28128 7039 7037 0x00000004
[ 596.020683][ T1131] Call Trace:
[ 596.020878][ T1131] ? __schedule+0x937/0x1ff0
[ 596.020900][ T1131] ? __sched_text_start+0x8/0x8
[ 596.020925][ T1131] schedule+0xd0/0x2a0
[ 596.020942][ T1131] schedule_preempt_disabled+0xf/0x20
[ 596.020956][ T1131] __mutex_lock+0x7ab/0x13c0
[ 596.021004][ T1131] ? fb_open+0xd3/0x430
[ 596.021023][ T1131] ? mutex_trylock+0x2c0/0x2c0
[ 596.021083][ T1131] ? __mutex_unlock_slowpath+0xe2/0x660
[ 596.021128][ T1131] ? chrdev_open+0xc4/0x5c0
[ 596.021180][ T1131] ? lock_downgrade+0x840/0x840
[ 596.021201][ T1131] ? fb_open+0xd3/0x430
[ 596.021213][ T1131] fb_open+0xd3/0x430
[ 596.021229][ T1131] ? get_fb_info.part.0+0x80/0x80
[ 596.021241][ T1131] chrdev_open+0x219/0x5c0
[ 596.021257][ T1131] ? cdev_put.part.0+0x50/0x50
[ 596.021327][ T1131] ? security_file_open+0x84/0x410
[ 596.021371][ T1131] do_dentry_open+0x4ba/0x1290
[ 596.021386][ T1131] ? cdev_put.part.0+0x50/0x50
[ 596.021404][ T1131] ? security_inode_permission+0xc4/0xf0
[ 596.021416][ T1131] ? chown_common+0x550/0x550
[ 596.021432][ T1131] ? inode_permission+0xab/0x500
[ 596.021453][ T1131] path_openat+0x1e59/0x27d0
[ 596.021477][ T1131] ? path_lookupat.isra.0+0x530/0x530
[ 596.021494][ T1131] ? print_usage_bug+0x240/0x240
[ 596.021517][ T1131] do_filp_open+0x192/0x260
[ 596.021532][ T1131] ? may_open_dev+0xf0/0xf0
[ 596.021582][ T1131] ? do_raw_spin_lock+0x129/0x2e0
[ 596.021613][ T1131] ? _raw_spin_unlock+0x24/0x40
[ 596.021649][ T1131] ? __alloc_fd+0x46d/0x600
[ 596.021672][ T1131] do_sys_openat2+0x585/0x7d0
[ 596.021688][ T1131] ? file_open_root+0x400/0x400
[ 596.021766][ T1131] ? rcu_read_lock_sched_held+0x9c/0xd0
[ 596.021784][ T1131] do_sys_open+0xc3/0x140
[ 596.021798][ T1131] ? filp_open+0x70/0x70
[ 596.021847][ T1131] ? fpregs_mark_activate+0x320/0x320
[ 596.021882][ T1131] ? trace_hardirqs_off_caller+0x55/0x230
[ 596.021931][ T1131] do_syscall_64+0xf6/0x7d0
[ 596.021970][ T1131] entry_SYSCALL_64_after_hwframe+0x49/0xb3
[ 596.021983][ T1131] RIP: 0033:0x441419
[ 596.022003][ T1131] Code: Bad RIP value.
[ 596.022010][ T1131] RSP: 002b:00007ffff32ba288 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
[ 596.022024][ T1131] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441419
[ 596.022032][ T1131] RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c
[ 596.022045][ T1131] RBP: 00000000006cb018 R08: 0000000000000004 R09: 00000000004002c8
[ 596.022053][ T1131] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402190
[ 596.022061][ T1131] R13: 0000000000402220 R14: 0000000000000000 R15: 0000000000000000
[ 596.022089][ T1131] INFO: task syz-executor672:7040 blocked for more than 143 seconds.
[ 596.022097][ T1131] Not tainted 5.6.0-syzkaller #0
[ 596.022102][ T1131] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 596.022108][ T1131] syz-executor672 D28128 7040 7036 0x00004004
[ 596.022129][ T1131] Call Trace:
[ 596.022148][ T1131] ? __schedule+0x937/0x1ff0
[ 596.022169][ T1131] ? __sched_text_start+0x8/0x8
[ 596.022193][ T1131] schedule+0xd0/0x2a0
[ 596.022211][ T1131] schedule_preempt_disabled+0xf/0x20
[ 596.022224][ T1131] __mutex_lock+0x7ab/0x13c0
[ 596.022240][ T1131] ? fb_open+0xd3/0x430
[ 596.022260][ T1131] ? mutex_trylock+0x2c0/0x2c0
[ 596.022279][ T1131] ? __mutex_unlock_slowpath+0xe2/0x660
[ 596.022291][ T1131] ? chrdev_open+0xc4/0x5c0
[ 596.022310][ T1131] ? lock_downgrade+0x840/0x840
[ 596.022332][ T1131] ? fb_open+0xd3/0x430
[ 596.022343][ T1131] fb_open+0xd3/0x430
[ 596.022358][ T1131] ? get_fb_info.part.0+0x80/0x80
[ 596.022370][ T1131] chrdev_open+0x219/0x5c0
[ 596.022385][ T1131] ? cdev_put.part.0+0x50/0x50
[ 596.022405][ T1131] ? security_file_open+0x84/0x410
[ 596.022421][ T1131] do_dentry_open+0x4ba/0x1290
[ 596.022436][ T1131] ? cdev_put.part.0+0x50/0x50
[ 596.022453][ T1131] ? security_inode_permission+0xc4/0xf0
[ 596.022466][ T1131] ? chown_common+0x550/0x550
[ 596.022481][ T1131] ? inode_permission+0xab/0x500
[ 596.022501][ T1131] path_openat+0x1e59/0x27d0
[ 596.022525][ T1131] ? path_lookupat.isra.0+0x530/0x530
[ 596.022542][ T1131] ? lock_acquire+0x1f2/0x8f0
[ 596.022565][ T1131] do_filp_open+0x192/0x260
[ 596.022579][ T1131] ? may_open_dev+0xf0/0xf0
[ 596.022603][ T1131] ? do_raw_spin_lock+0x129/0x2e0
[ 596.022627][ T1131] ? _raw_spin_unlock+0x24/0x40
[ 596.022640][ T1131] ? __alloc_fd+0x46d/0x600
[ 596.022662][ T1131] do_sys_openat2+0x585/0x7d0
[ 596.022678][ T1131] ? file_open_root+0x400/0x400
[ 596.022700][ T1131] ? rcu_read_lock_sched_held+0x9c/0xd0
[ 596.022717][ T1131] do_sys_open+0xc3/0x140
[ 596.022731][ T1131] ? filp_open+0x70/0x70
[ 596.022747][ T1131] ? fpregs_mark_activate+0x320/0x320
[ 596.022762][ T1131] ? trace_hardirqs_off_caller+0x55/0x230
[ 596.022783][ T1131] do_syscall_64+0xf6/0x7d0
[ 596.022801][ T1131] entry_SYSCALL_64_after_hwframe+0x49/0xb3
[ 596.022810][ T1131] RIP: 0033:0x441419
[ 596.022823][ T1131] Code: Bad RIP value.
[ 596.022831][ T1131] RSP: 002b:00007ffff32ba288 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
[ 596.022844][ T1131] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441419
[ 596.022852][ T1131] RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c
[ 596.022860][ T1131] RBP: 00000000006cb018 R08: 0000000000000004 R09: 00000000004002c8
[ 596.022868][ T1131] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402190
[ 596.022876][ T1131] R13: 0000000000402220 R14: 0000000000000000 R15: 0000000000000000
[ 596.022902][ T1131] INFO: task syz-executor672:7041 blocked for more than 143 seconds.
[ 596.022910][ T1131] Not tainted 5.6.0-syzkaller #0
[ 596.022915][ T1131] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 596.022921][ T1131] syz-executor672 D27856 7041 7033 0x00000004
[ 596.022940][ T1131] Call Trace:
[ 596.022958][ T1131] ? __schedule+0x937/0x1ff0
[ 596.022980][ T1131] ? __sched_text_start+0x8/0x8
[ 596.023004][ T1131] schedule+0xd0/0x2a0
[ 596.023021][ T1131] schedule_preempt_disabled+0xf/0x20
[ 596.023035][ T1131] __mutex_lock+0x7ab/0x13c0
[ 596.023058][ T1131] ? fb_open+0xd3/0x430
[ 596.023078][ T1131] ? mutex_trylock+0x2c0/0x2c0
[ 596.023097][ T1131] ? __mutex_unlock_slowpath+0xe2/0x660
[ 596.023109][ T1131] ? chrdev_open+0xc4/0x5c0
[ 596.023128][ T1131] ? lock_downgrade+0x840/0x840
[ 596.023149][ T1131] ? fb_open+0xd3/0x430
[ 596.023161][ T1131] fb_open+0xd3/0x430
[ 596.023176][ T1131] ? get_fb_info.part.0+0x80/0x80
[ 596.023188][ T1131] chrdev_open+0x219/0x5c0
[ 596.023202][ T1131] ? cdev_put.part.0+0x50/0x50
[ 596.023221][ T1131] ? security_file_open+0x84/0x410
[ 596.023238][ T1131] do_dentry_open+0x4ba/0x1290
[ 596.023253][ T1131] ? cdev_put.part.0+0x50/0x50
[ 596.023270][ T1131] ? security_inode_permission+0xc4/0xf0
[ 596.023283][ T1131] ? chown_common+0x550/0x550
[ 596.023298][ T1131] ? inode_permission+0xab/0x500
[ 596.023318][ T1131] path_openat+0x1e59/0x27d0
[ 596.023342][ T1131] ? path_lookupat.isra.0+0x530/0x530
[ 596.023359][ T1131] ? print_usage_bug+0x240/0x240
[ 596.023382][ T1131] do_filp_open+0x192/0x260
[ 596.023397][ T1131] ? may_open_dev+0xf0/0xf0
[ 596.023421][ T1131] ? do_raw_spin_lock+0x129/0x2e0
[ 596.023445][ T1131] ? _raw_spin_unlock+0x24/0x40
[ 596.023458][ T1131] ? __alloc_fd+0x46d/0x600
[ 596.023480][ T1131] do_sys_openat2+0x585/0x7d0
[ 596.023496][ T1131] ? file_open_root+0x400/0x400
[ 596.023517][ T1131] ? rcu_read_lock_sched_held+0x9c/0xd0
[ 596.023535][ T1131] do_sys_open+0xc3/0x140
[ 596.023557][ T1131] ? filp_open+0x70/0x70
[ 596.023574][ T1131] ? fpregs_mark_activate+0x320/0x320
[ 596.023588][ T1131] ? trace_hardirqs_off_caller+0x55/0x230
[ 596.023610][ T1131] do_syscall_64+0xf6/0x7d0
[ 596.023627][ T1131] entry_SYSCALL_64_after_hwframe+0x49/0xb3
[ 596.023637][ T1131] RIP: 0033:0x441419
[ 596.023649][ T1131] Code: Bad RIP value.
[ 596.023657][ T1131] RSP: 002b:00007ffff32ba288 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
[ 596.023669][ T1131] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441419
[ 596.023678][ T1131] RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c
[ 596.023686][ T1131] RBP: 00000000006cb018 R08: 0000000000000004 R09: 00000000004002c8
[ 596.023694][ T1131] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402190
[ 596.023702][ T1131] R13: 0000000000402220 R14: 0000000000000000 R15: 0000000000000000
[ 596.023729][ T1131] INFO: task syz-executor672:7042 blocked for more than 143 seconds.
[ 596.023737][ T1131] Not tainted 5.6.0-syzkaller #0
[ 596.023742][ T1131] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 596.023748][ T1131] syz-executor672 D28128 7042 7035 0x00000004
[ 596.023768][ T1131] Call Trace:
[ 596.023786][ T1131] ? __schedule+0x937/0x1ff0
[ 596.023807][ T1131] ? __sched_text_start+0x8/0x8
[ 596.023831][ T1131] schedule+0xd0/0x2a0
[ 596.023849][ T1131] schedule_preempt_disabled+0xf/0x20
[ 596.023862][ T1131] __mutex_lock+0x7ab/0x13c0
[ 596.023878][ T1131] ? fb_open+0xd3/0x430
[ 596.023898][ T1131] ? mutex_trylock+0x2c0/0x2c0
[ 596.023917][ T1131] ? __mutex_unlock_slowpath+0xe2/0x660
[ 596.023929][ T1131] ? chrdev_open+0xc4/0x5c0
[ 596.023948][ T1131] ? lock_downgrade+0x840/0x840
[ 596.023969][ T1131] ? fb_open+0xd3/0x430
[ 596.023981][ T1131] fb_open+0xd3/0x430
[ 596.023996][ T1131] ? get_fb_info.part.0+0x80/0x80
[ 596.024008][ T1131] chrdev_open+0x219/0x5c0
[ 596.024023][ T1131] ? cdev_put.part.0+0x50/0x50
[ 596.024047][ T1131] ? security_file_open+0x84/0x410
[ 596.024064][ T1131] do_dentry_open+0x4ba/0x1290
[ 596.024079][ T1131] ? cdev_put.part.0+0x50/0x50
[ 596.024096][ T1131] ? security_inode_permission+0xc4/0xf0
[ 596.024108][ T1131] ? chown_common+0x550/0x550
[ 596.024123][ T1131] ? inode_permission+0xab/0x500
[ 596.024143][ T1131] path_openat+0x1e59/0x27d0
[ 596.024167][ T1131] ? path_lookupat.isra.0+0x530/0x530
[ 596.024184][ T1131] ? print_usage_bug+0x240/0x240
[ 596.024208][ T1131] do_filp_open+0x192/0x260
[ 596.024222][ T1131] ? may_open_dev+0xf0/0xf0
[ 596.024246][ T1131] ? do_raw_spin_lock+0x129/0x2e0
[ 596.024270][ T1131] ? _raw_spin_unlock+0x24/0x40
[ 596.024283][ T1131] ? __alloc_fd+0x46d/0x600
[ 596.024305][ T1131] do_sys_openat2+0x585/0x7d0
[ 596.024321][ T1131] ? file_open_root+0x400/0x400
[ 596.024342][ T1131] ? rcu_read_lock_sched_held+0x9c/0xd0
[ 596.024359][ T1131] do_sys_open+0xc3/0x140
[ 596.024372][ T1131] ? filp_open+0x70/0x70
[ 596.024389][ T1131] ? fpregs_mark_activate+0x320/0x320
[ 596.024403][ T1131] ? trace_hardirqs_off_caller+0x55/0x230
[ 596.024425][ T1131] do_syscall_64+0xf6/0x7d0
[ 596.024442][ T1131] entry_SYSCALL_64_after_hwframe+0x49/0xb3
[ 596.024451][ T1131] RIP: 0033:0x441419
[ 596.024464][ T1131] Code: Bad RIP value.
[ 596.024472][ T1131] RSP: 002b:00007ffff32ba288 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
[ 596.024484][ T1131] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441419
[ 596.024492][ T1131] RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c
[ 596.024500][ T1131] RBP: 00000000006cb018 R08: 0000000000000004 R09: 00000000004002c8
[ 596.024508][ T1131] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402190
[ 596.024516][ T1131] R13: 0000000000402220 R14: 0000000000000000 R15: 0000000000000000
[ 596.024542][ T1131] INFO: task syz-executor672:7043 blocked for more than 143 seconds.
[ 596.024550][ T1131] Not tainted 5.6.0-syzkaller #0
[ 596.024555][ T1131] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 596.024561][ T1131] syz-executor672 D28128 7043 7038 0x00004004
[ 596.024580][ T1131] Call Trace:
[ 596.024599][ T1131] ? __schedule+0x937/0x1ff0
[ 596.024620][ T1131] ? __sched_text_start+0x8/0x8
[ 596.024644][ T1131] schedule+0xd0/0x2a0
[ 596.024661][ T1131] schedule_preempt_disabled+0xf/0x20
[ 596.024674][ T1131] __mutex_lock+0x7ab/0x13c0
[ 596.024690][ T1131] ? fb_open+0xd3/0x430
[ 596.024710][ T1131] ? mutex_trylock+0x2c0/0x2c0
[ 596.024729][ T1131] ? __mutex_unlock_slowpath+0xe2/0x660
[ 596.024741][ T1131] ? chrdev_open+0xc4/0x5c0
[ 596.024760][ T1131] ? lock_downgrade+0x840/0x840
[ 596.024782][ T1131] ? fb_open+0xd3/0x430
[ 596.024793][ T1131] fb_open+0xd3/0x430
[ 596.024808][ T1131] ? get_fb_info.part.0+0x80/0x80
[ 596.024820][ T1131] chrdev_open+0x219/0x5c0
[ 596.024835][ T1131] ? cdev_put.part.0+0x50/0x50
[ 596.024854][ T1131] ? security_file_open+0x84/0x410
[ 596.024871][ T1131] do_dentry_open+0x4ba/0x1290
[ 596.024886][ T1131] ? cdev_put.part.0+0x50/0x50
[ 596.024903][ T1131] ? security_inode_permission+0xc4/0xf0
[ 596.024916][ T1131] ? chown_common+0x550/0x550
[ 596.024931][ T1131] ? inode_permission+0xab/0x500
[ 596.024951][ T1131] path_openat+0x1e59/0x27d0
[ 596.024975][ T1131] ? path_lookupat.isra.0+0x530/0x530
[ 596.024992][ T1131] ? lock_acquire+0x1f2/0x8f0
[ 596.025015][ T1131] do_filp_open+0x192/0x260
[ 596.025029][ T1131] ? may_open_dev+0xf0/0xf0
[ 596.025058][ T1131] ? do_raw_spin_lock+0x129/0x2e0
[ 596.025083][ T1131] ? _raw_spin_unlock+0x24/0x40
[ 596.025095][ T1131] ? __alloc_fd+0x46d/0x600
[ 596.025117][ T1131] do_sys_openat2+0x585/0x7d0
[ 596.025134][ T1131] ? file_open_root+0x400/0x400
[ 596.025155][ T1131] ? rcu_read_lock_sched_held+0x9c/0xd0
[ 596.025173][ T1131] do_sys_open+0xc3/0x140
[ 596.025186][ T1131] ? filp_open+0x70/0x70
[ 596.025203][ T1131] ? fpregs_mark_activate+0x320/0x320
[ 596.025217][ T1131] ? trace_hardirqs_off_caller+0x55/0x230
[ 596.025239][ T1131] do_syscall_64+0xf6/0x7d0
[ 596.025257][ T1131] entry_SYSCALL_64_after_hwframe+0x49/0xb3
[ 596.025266][ T1131] RIP: 0033:0x441419
[ 596.025279][ T1131] Code: Bad RIP value.
[ 596.025286][ T1131] RSP: 002b:00007ffff32ba288 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
[ 596.025299][ T1131] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441419
[ 596.025307][ T1131] RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c
[ 596.025315][ T1131] RBP: 00000000006cb018 R08: 0000000000000004 R09: 00000000004002c8
[ 596.025323][ T1131] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402190
[ 596.025331][ T1131] R13: 0000000000402220 R14: 0000000000000000 R15: 0000000000000000
[ 596.025354][ T1131]
[ 596.025354][ T1131] Showing all locks held in the system:
[ 596.025368][ T1131] 1 lock held by khungtaskd/1131:
[ 596.025373][ T1131] #0: ffffffff899bc240 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260
[ 596.025431][ T1131] 1 lock held by in:imklog/6707:
[ 596.025436][ T1131] #0: ffff8880a3470e30 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100
[ 596.025468][ T1131] 2 locks held by syz-executor672/7034:
[ 596.025478][ T1131] 1 lock held by syz-executor672/7039:
[ 596.025482][ T1131] #0: ffff8880a3402078 (&fb_info->lock){+.+.}-{3:3}, at: fb_open+0xd3/0x430
[ 596.025517][ T1131] 1 lock held by syz-executor672/7040:
[ 596.025521][ T1131] #0: ffff8880a3402078 (&fb_info->lock){+.+.}-{3:3}, at: fb_open+0xd3/0x430
[ 596.025550][ T1131] 1 lock held by syz-executor672/7041:
[ 596.025555][ T1131] #0: ffff8880a3402078 (&fb_info->lock){+.+.}-{3:3}, at: fb_open+0xd3/0x430
[ 596.025584][ T1131] 1 lock held by syz-executor672/7042:
[ 596.025588][ T1131] #0: ffff8880a3402078 (&fb_info->lock){+.+.}-{3:3}, at: fb_open+0xd3/0x430
[ 596.025617][ T1131] 1 lock held by syz-executor672/7043:
[ 596.025622][ T1131] #0: ffff8880a3402078 (&fb_info->lock){+.+.}-{3:3}, at: fb_open+0xd3/0x430
[ 596.025647][ T1131]
[ 596.025652][ T1131] =============================================
[ 596.025652][ T1131]
[ 596.025658][ T1131] NMI backtrace for cpu 1
[ 596.025671][ T1131] CPU: 1 PID: 1131 Comm: khungtaskd Not tainted 5.6.0-syzkaller #0
[ 596.025679][ T1131] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 596.025683][ T1131] Call Trace:
[ 596.025752][ T1131] dump_stack+0x188/0x20d
[ 596.025772][ T1131] nmi_cpu_backtrace.cold+0x70/0xb1
[ 596.025810][ T1131] ? lapic_can_unplug_cpu.cold+0x3b/0x3b
[ 596.025826][ T1131] nmi_trigger_cpumask_backtrace+0x231/0x27e
[ 596.025870][ T1131] watchdog+0xa8c/0x1010
[ 596.025888][ T1131] ? reset_hung_task_detector+0x30/0x30
[ 596.025930][ T1131] kthread+0x388/0x470
[ 596.025944][ T1131] ? kthread_mod_delayed_work+0x1a0/0x1a0
[ 596.025958][ T1131] ret_from_fork+0x24/0x30
[ 596.025982][ T1131] Sending NMI from CPU 1 to CPUs 0:
[ 596.026696][ C0] NMI backtrace for cpu 0
[ 596.026701][ C0] CPU: 0 PID: 7034 Comm: syz-executor672 Not tainted 5.6.0-syzkaller #0
[ 596.026707][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 596.026711][ C0] RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x4/0x20
[ 596.026721][ C0] Code: 84 00 00 00 00 00 48 8b 0c 24 0f b7 d6 0f b7 f7 bf 03 00 00 00 e9 ec fe ff ff 66 90 66 2e 0f 1f 84 00 00 00 00 00 48 8b 0c 24 <89> f2 89 fe bf 05 00 00 00 e9 ce fe ff ff 0f 1f 40 00 66 2e 0f 1f
[ 596.026724][ C0] RSP: 0018:ffffc900018074d0 EFLAGS: 00000212
[ 596.026731][ C0] RAX: ffff8880000a0238 RBX: 0000000000000000 RCX: ffffffff83ba5b24
[ 596.026736][ C0] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000007
[ 596.026741][ C0] RBP: ffff8880000a0240 R08: ffff888095062540 R09: 0000000000000040
[ 596.026745][ C0] R10: ffff8880a405255f R11: ffffed101480a4ab R12: 0000000000000050
[ 596.026750][ C0] R13: ffff8880000a0000 R14: 0000000000000000 R15: 0000000000000008
[ 596.026754][ C0] FS: 00000000025fd880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
[ 596.026758][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 596.026763][ C0] CR2: 00000000006cc080 CR3: 000000009a3d3000 CR4: 00000000001406f0
[ 596.026767][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 596.026772][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 596.026774][ C0] Call Trace:
[ 596.026778][ C0] bitfill_aligned+0x134/0x200
[ 596.026781][ C0] cfb_fillrect+0x418/0x7a0
[ 596.026784][ C0] ? cfb_fillrect+0x7a0/0x7a0
[ 596.026787][ C0] vga16fb_fillrect+0x68f/0x1960
[ 596.026790][ C0] ? memcpy+0x39/0x60
[ 596.026793][ C0] bit_clear_margins+0x2d5/0x4a0
[ 596.026796][ C0] ? bit_bmove+0x210/0x210
[ 596.026799][ C0] ? vesafb_probe.cold+0x1162/0x1162
[ 596.026803][ C0] fbcon_clear_margins+0x1de/0x240
[ 596.026806][ C0] fbcon_switch+0xd21/0x1740
[ 596.026809][ C0] ? fbcon_set_def_font+0x370/0x370
[ 596.026812][ C0] ? fbcon_cursor+0x477/0x650
[ 596.026815][ C0] ? bit_clear+0x4e0/0x4e0
[ 596.026819][ C0] ? is_console_locked+0x5/0x10
[ 596.026822][ C0] ? fbcon_set_origin+0x26/0x50
[ 596.026825][ C0] redraw_screen+0x2ae/0x770
[ 596.026828][ C0] ? vesafb_probe.cold+0x1162/0x1162
[ 596.026832][ C0] ? respond_string+0x290/0x290
[ 596.026835][ C0] ? fbcon_set_palette+0x3b1/0x4a0
[ 596.026838][ C0] fbcon_modechanged+0x5c3/0x790
[ 596.026841][ C0] fbcon_update_vcs+0x3a/0x50
[ 596.026844][ C0] fb_set_var+0xad0/0xd40
[ 596.026847][ C0] ? fb_blank+0x190/0x190
[ 596.026850][ C0] ? preempt_schedule_common+0x5e/0xc0
[ 596.026854][ C0] ? preempt_schedule_thunk+0x16/0x18
[ 596.026857][ C0] ? _raw_spin_unlock_irqrestore+0x62/0xe0
[ 596.026860][ C0] do_fb_ioctl+0x390/0x6e0
[ 596.026863][ C0] ? fb_mmap+0x550/0x550
[ 596.026867][ C0] ? tomoyo_execute_permission+0x470/0x470
[ 596.026870][ C0] ? __sanitizer_cov_trace_switch+0x45/0x70
[ 596.026873][ C0] ? do_vfs_ioctl+0x50c/0x12d0
[ 596.026876][ C0] ? up_read+0x1ab/0x750
[ 596.026879][ C0] ? down_read_nested+0x420/0x420
[ 596.026882][ C0] fb_ioctl+0xdd/0x130
[ 596.026885][ C0] ? do_fb_ioctl+0x6e0/0x6e0
[ 596.026888][ C0] ksys_ioctl+0x11a/0x180
[ 596.026891][ C0] __x64_sys_ioctl+0x6f/0xb0
[ 596.026894][ C0] ? lockdep_hardirqs_on+0x463/0x620
[ 596.026897][ C0] do_syscall_64+0xf6/0x7d0
[ 596.026901][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xb3
[ 596.026904][ C0] RIP: 0033:0x441419
[ 596.026914][ 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
[ 596.026917][ C0] RSP: 002b:00007ffff32ba288 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[ 596.026925][ C0] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441419
[ 596.026930][ C0] RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000003
[ 596.026935][ C0] RBP: 00000000006cb018 R08: 00000000004002c8 R09: 00000000004002c8
[ 596.026939][ C0] R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000402190
[ 596.026944][ C0] R13: 0000000000402220 R14: 0000000000000000 R15: 0000000000000000
[ 596.027001][ T1131] Kernel panic - not syncing: hung_task: blocked tasks
[ 596.027013][ T1131] CPU: 1 PID: 1131 Comm: khungtaskd Not tainted 5.6.0-syzkaller #0
[ 596.027019][ T1131] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 596.027023][ T1131] Call Trace:
[ 596.027035][ T1131] dump_stack+0x188/0x20d
[ 596.027092][ T1131] panic+0x2e3/0x75c
[ 596.027104][ T1131] ? add_taint.cold+0x16/0x16
[ 596.027118][ T1131] ? cpumask_next+0x3c/0x40
[ 596.027128][ T1131] ? printk_safe_flush+0xd9/0x120
[ 596.027137][ T1131] ? watchdog+0xa8c/0x1010
[ 596.027149][ T1131] ? nmi_trigger_cpumask_backtrace+0x214/0x27e
[ 596.027160][ T1131] watchdog+0xa9d/0x1010
[ 596.027175][ T1131] ? reset_hung_task_detector+0x30/0x30
[ 596.027186][ T1131] kthread+0x388/0x470
[ 596.027196][ T1131] ? kthread_mod_delayed_work+0x1a0/0x1a0
[ 596.027208][ T1131] ret_from_fork+0x24/0x30
[ 596.029097][ T1131] Kernel Offset: disabled
[ 598.089045][ T1131] Rebooting in 86400 seconds..