[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 66.108681][ T26] audit: type=1800 audit(1584380412.604:25): pid=9593 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 66.128657][ T26] audit: type=1800 audit(1584380412.604:26): pid=9593 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 66.156102][ T26] audit: type=1800 audit(1584380412.614:27): pid=9593 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.80' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 593.976170][ T1127] INFO: task syz-executor734:9753 blocked for more than 143 seconds. [ 593.976191][ T1127] Not tainted 5.6.0-rc6-syzkaller #0 [ 593.976197][ T1127] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 593.976204][ T1127] syz-executor734 D28392 9753 9752 0x20020004 [ 593.976228][ T1127] Call Trace: [ 593.976438][ T1127] ? __schedule+0x934/0x1f90 [ 593.976468][ T1127] ? __sched_text_start+0x8/0x8 [ 593.976501][ T1127] schedule+0xd0/0x2a0 [ 593.976522][ T1127] schedule_preempt_disabled+0xf/0x20 [ 593.976537][ T1127] __mutex_lock+0x7ab/0x13c0 [ 593.976611][ T1127] ? fb_open+0xd3/0x430 [ 593.976637][ T1127] ? mutex_trylock+0x2c0/0x2c0 [ 593.976661][ T1127] ? __mutex_unlock_slowpath+0xe2/0x660 [ 593.976721][ T1127] ? chrdev_open+0xc4/0x5c0 [ 593.976778][ T1127] ? lock_downgrade+0x7f0/0x7f0 [ 593.976808][ T1127] ? fb_open+0xd3/0x430 [ 593.976819][ T1127] fb_open+0xd3/0x430 [ 593.976838][ T1127] ? get_fb_info.part.0+0x80/0x80 [ 593.976852][ T1127] chrdev_open+0x219/0x5c0 [ 593.976868][ T1127] ? rwlock_bug.part.0+0x90/0x90 [ 593.976899][ T1127] ? cdev_put.part.0+0x50/0x50 [ 593.976933][ T1127] do_dentry_open+0x4a2/0x1250 [ 593.976952][ T1127] ? cdev_put.part.0+0x50/0x50 [ 593.976994][ T1127] ? security_inode_permission+0xc4/0xf0 [ 593.977011][ T1127] ? chown_common+0x550/0x550 [ 593.977026][ T1127] ? inode_permission+0xab/0x500 [ 593.977054][ T1127] path_openat+0x122a/0x32b0 [ 593.977093][ T1127] ? path_mountpoint.isra.0+0x370/0x370 [ 593.977105][ T1127] ? __lock_acquire+0x14bd/0x3ca0 [ 593.977127][ T1127] ? __lock_acquire+0x14bd/0x3ca0 [ 593.977158][ T1127] do_filp_open+0x192/0x260 [ 593.977176][ T1127] ? may_open_dev+0xf0/0xf0 [ 593.977207][ T1127] ? do_raw_spin_lock+0x129/0x2e0 [ 593.977240][ T1127] ? _raw_spin_unlock+0x24/0x40 [ 593.977276][ T1127] ? __alloc_fd+0x46d/0x600 [ 593.977308][ T1127] do_sys_openat2+0x54c/0x740 [ 593.977330][ T1127] ? file_open_root+0x3d0/0x3d0 [ 593.977368][ T1127] do_sys_open+0xc3/0x140 [ 593.977383][ T1127] ? filp_open+0x70/0x70 [ 593.977433][ T1127] ? fpregs_mark_activate+0x320/0x320 [ 593.977475][ T1127] ? trace_hardirqs_off_caller+0x55/0x230 [ 593.977509][ T1127] do_fast_syscall_32+0x270/0xe8f [ 593.977550][ T1127] entry_SYSENTER_compat+0x70/0x7f [ 593.977591][ T1127] INFO: task syz-executor734:9754 blocked for more than 143 seconds. [ 593.977600][ T1127] Not tainted 5.6.0-rc6-syzkaller #0 [ 593.977605][ T1127] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 593.977612][ T1127] syz-executor734 D28392 9754 9749 0x20020004 [ 593.977634][ T1127] Call Trace: [ 593.977657][ T1127] ? __schedule+0x934/0x1f90 [ 593.977684][ T1127] ? __sched_text_start+0x8/0x8 [ 593.977716][ T1127] schedule+0xd0/0x2a0 [ 593.977736][ T1127] schedule_preempt_disabled+0xf/0x20 [ 593.977750][ T1127] __mutex_lock+0x7ab/0x13c0 [ 593.977769][ T1127] ? fb_open+0xd3/0x430 [ 593.977793][ T1127] ? mutex_trylock+0x2c0/0x2c0 [ 593.977817][ T1127] ? __mutex_unlock_slowpath+0xe2/0x660 [ 593.977830][ T1127] ? chrdev_open+0xc4/0x5c0 [ 593.977853][ T1127] ? lock_downgrade+0x7f0/0x7f0 [ 593.977882][ T1127] ? fb_open+0xd3/0x430 [ 593.977901][ T1127] fb_open+0xd3/0x430 [ 593.977919][ T1127] ? get_fb_info.part.0+0x80/0x80 [ 593.977933][ T1127] chrdev_open+0x219/0x5c0 [ 593.977948][ T1127] ? rwlock_bug.part.0+0x90/0x90 [ 593.977964][ T1127] ? cdev_put.part.0+0x50/0x50 [ 593.977996][ T1127] do_dentry_open+0x4a2/0x1250 [ 593.978014][ T1127] ? cdev_put.part.0+0x50/0x50 [ 593.978034][ T1127] ? security_inode_permission+0xc4/0xf0 [ 593.978049][ T1127] ? chown_common+0x550/0x550 [ 593.978064][ T1127] ? inode_permission+0xab/0x500 [ 593.978092][ T1127] path_openat+0x122a/0x32b0 [ 593.978130][ T1127] ? path_mountpoint.isra.0+0x370/0x370 [ 593.978142][ T1127] ? __lock_acquire+0x14bd/0x3ca0 [ 593.978163][ T1127] ? __lock_acquire+0x14bd/0x3ca0 [ 593.978194][ T1127] do_filp_open+0x192/0x260 [ 593.978212][ T1127] ? may_open_dev+0xf0/0xf0 [ 593.978243][ T1127] ? do_raw_spin_lock+0x129/0x2e0 [ 593.978276][ T1127] ? _raw_spin_unlock+0x24/0x40 [ 593.978291][ T1127] ? __alloc_fd+0x46d/0x600 [ 593.978322][ T1127] do_sys_openat2+0x54c/0x740 [ 593.978342][ T1127] ? file_open_root+0x3d0/0x3d0 [ 593.978380][ T1127] do_sys_open+0xc3/0x140 [ 593.978395][ T1127] ? filp_open+0x70/0x70 [ 593.978422][ T1127] ? trace_hardirqs_off_caller+0x55/0x230 [ 593.978448][ T1127] do_fast_syscall_32+0x270/0xe8f [ 593.978470][ T1127] entry_SYSENTER_compat+0x70/0x7f [ 593.978509][ T1127] INFO: task syz-executor734:9755 blocked for more than 143 seconds. [ 593.978517][ T1127] Not tainted 5.6.0-rc6-syzkaller #0 [ 593.978523][ T1127] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 593.978529][ T1127] syz-executor734 D28392 9755 9751 0x20020004 [ 593.978551][ T1127] Call Trace: [ 593.978574][ T1127] ? __schedule+0x934/0x1f90 [ 593.978600][ T1127] ? __sched_text_start+0x8/0x8 [ 593.978633][ T1127] schedule+0xd0/0x2a0 [ 593.978652][ T1127] schedule_preempt_disabled+0xf/0x20 [ 593.978666][ T1127] __mutex_lock+0x7ab/0x13c0 [ 593.978685][ T1127] ? fb_open+0xd3/0x430 [ 593.978709][ T1127] ? mutex_trylock+0x2c0/0x2c0 [ 593.978733][ T1127] ? __mutex_unlock_slowpath+0xe2/0x660 [ 593.978746][ T1127] ? chrdev_open+0xc4/0x5c0 [ 593.978769][ T1127] ? lock_downgrade+0x7f0/0x7f0 [ 593.978798][ T1127] ? fb_open+0xd3/0x430 [ 593.978809][ T1127] fb_open+0xd3/0x430 [ 593.978827][ T1127] ? get_fb_info.part.0+0x80/0x80 [ 593.978841][ T1127] chrdev_open+0x219/0x5c0 [ 593.978856][ T1127] ? rwlock_bug.part.0+0x90/0x90 [ 593.978872][ T1127] ? cdev_put.part.0+0x50/0x50 [ 593.978911][ T1127] do_dentry_open+0x4a2/0x1250 [ 593.978930][ T1127] ? cdev_put.part.0+0x50/0x50 [ 593.978949][ T1127] ? security_inode_permission+0xc4/0xf0 [ 593.978964][ T1127] ? chown_common+0x550/0x550 [ 593.978979][ T1127] ? inode_permission+0xab/0x500 [ 593.979007][ T1127] path_openat+0x122a/0x32b0 [ 593.979046][ T1127] ? path_mountpoint.isra.0+0x370/0x370 [ 593.979068][ T1127] ? __lock_acquire+0x14bd/0x3ca0 [ 593.979099][ T1127] do_filp_open+0x192/0x260 [ 593.979118][ T1127] ? may_open_dev+0xf0/0xf0 [ 593.979148][ T1127] ? do_raw_spin_lock+0x129/0x2e0 [ 593.979181][ T1127] ? _raw_spin_unlock+0x24/0x40 [ 593.979196][ T1127] ? __alloc_fd+0x46d/0x600 [ 593.979227][ T1127] do_sys_openat2+0x54c/0x740 [ 593.979247][ T1127] ? file_open_root+0x3d0/0x3d0 [ 593.979285][ T1127] do_sys_open+0xc3/0x140 [ 593.979301][ T1127] ? filp_open+0x70/0x70 [ 593.979323][ T1127] ? fpregs_mark_activate+0x320/0x320 [ 593.979340][ T1127] ? trace_hardirqs_off_caller+0x55/0x230 [ 593.979366][ T1127] do_fast_syscall_32+0x270/0xe8f [ 593.979388][ T1127] entry_SYSENTER_compat+0x70/0x7f [ 593.979427][ T1127] INFO: task syz-executor734:9756 blocked for more than 143 seconds. [ 593.979435][ T1127] Not tainted 5.6.0-rc6-syzkaller #0 [ 593.979440][ T1127] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 593.979446][ T1127] syz-executor734 D28048 9756 9747 0x20020004 [ 593.979467][ T1127] Call Trace: [ 593.979490][ T1127] ? __schedule+0x934/0x1f90 [ 593.979516][ T1127] ? __sched_text_start+0x8/0x8 [ 593.979549][ T1127] schedule+0xd0/0x2a0 [ 593.979569][ T1127] schedule_preempt_disabled+0xf/0x20 [ 593.979582][ T1127] __mutex_lock+0x7ab/0x13c0 [ 593.979601][ T1127] ? fb_open+0xd3/0x430 [ 593.979625][ T1127] ? mutex_trylock+0x2c0/0x2c0 [ 593.979649][ T1127] ? __mutex_unlock_slowpath+0xe2/0x660 [ 593.979663][ T1127] ? chrdev_open+0xc4/0x5c0 [ 593.979685][ T1127] ? lock_downgrade+0x7f0/0x7f0 [ 593.979714][ T1127] ? fb_open+0xd3/0x430 [ 593.979726][ T1127] fb_open+0xd3/0x430 [ 593.979744][ T1127] ? get_fb_info.part.0+0x80/0x80 [ 593.979758][ T1127] chrdev_open+0x219/0x5c0 [ 593.979773][ T1127] ? rwlock_bug.part.0+0x90/0x90 [ 593.979788][ T1127] ? cdev_put.part.0+0x50/0x50 [ 593.979821][ T1127] do_dentry_open+0x4a2/0x1250 [ 593.979839][ T1127] ? cdev_put.part.0+0x50/0x50 [ 593.979858][ T1127] ? security_inode_permission+0xc4/0xf0 [ 593.979874][ T1127] ? chown_common+0x550/0x550 [ 593.979894][ T1127] ? inode_permission+0xab/0x500 [ 593.979923][ T1127] path_openat+0x122a/0x32b0 [ 593.979961][ T1127] ? path_mountpoint.isra.0+0x370/0x370 [ 593.979984][ T1127] ? __lock_acquire+0x14bd/0x3ca0 [ 593.980015][ T1127] do_filp_open+0x192/0x260 [ 593.980033][ T1127] ? may_open_dev+0xf0/0xf0 [ 593.980064][ T1127] ? do_raw_spin_lock+0x129/0x2e0 [ 593.980097][ T1127] ? _raw_spin_unlock+0x24/0x40 [ 593.980112][ T1127] ? __alloc_fd+0x46d/0x600 [ 593.980143][ T1127] do_sys_openat2+0x54c/0x740 [ 593.980163][ T1127] ? file_open_root+0x3d0/0x3d0 [ 593.980201][ T1127] do_sys_open+0xc3/0x140 [ 593.980217][ T1127] ? filp_open+0x70/0x70 [ 593.980239][ T1127] ? fpregs_mark_activate+0x320/0x320 [ 593.980256][ T1127] ? trace_hardirqs_off_caller+0x55/0x230 [ 593.980282][ T1127] do_fast_syscall_32+0x270/0xe8f [ 593.980305][ T1127] entry_SYSENTER_compat+0x70/0x7f [ 593.980343][ T1127] INFO: task syz-executor734:9757 blocked for more than 143 seconds. [ 593.980351][ T1127] Not tainted 5.6.0-rc6-syzkaller #0 [ 593.980356][ T1127] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 593.980362][ T1127] syz-executor734 D28392 9757 9750 0x20020004 [ 593.980384][ T1127] Call Trace: [ 593.980406][ T1127] ? __schedule+0x934/0x1f90 [ 593.980433][ T1127] ? __sched_text_start+0x8/0x8 [ 593.980524][ T1127] schedule+0xd0/0x2a0 [ 593.980569][ T1127] schedule_preempt_disabled+0xf/0x20 [ 593.980590][ T1127] __mutex_lock+0x7ab/0x13c0 [ 593.980610][ T1127] ? fb_open+0xd3/0x430 [ 593.980632][ T1127] ? mutex_trylock+0x2c0/0x2c0 [ 593.980656][ T1127] ? __mutex_unlock_slowpath+0xe2/0x660 [ 593.980680][ T1127] ? chrdev_open+0xc4/0x5c0 [ 593.980703][ T1127] ? lock_downgrade+0x7f0/0x7f0 [ 593.980731][ T1127] ? fb_open+0xd3/0x430 [ 593.980743][ T1127] fb_open+0xd3/0x430 [ 593.980761][ T1127] ? get_fb_info.part.0+0x80/0x80 [ 593.980775][ T1127] chrdev_open+0x219/0x5c0 [ 593.980789][ T1127] ? rwlock_bug.part.0+0x90/0x90 [ 593.980805][ T1127] ? cdev_put.part.0+0x50/0x50 [ 593.980837][ T1127] do_dentry_open+0x4a2/0x1250 [ 593.980856][ T1127] ? cdev_put.part.0+0x50/0x50 [ 593.980876][ T1127] ? security_inode_permission+0xc4/0xf0 [ 593.980890][ T1127] ? chown_common+0x550/0x550 [ 593.980905][ T1127] ? inode_permission+0xab/0x500 [ 593.980933][ T1127] path_openat+0x122a/0x32b0 [ 593.980970][ T1127] ? path_mountpoint.isra.0+0x370/0x370 [ 593.980982][ T1127] ? __lock_acquire+0x14bd/0x3ca0 [ 593.981003][ T1127] ? __lock_acquire+0x14bd/0x3ca0 [ 593.981034][ T1127] do_filp_open+0x192/0x260 [ 593.981052][ T1127] ? may_open_dev+0xf0/0xf0 [ 593.981082][ T1127] ? do_raw_spin_lock+0x129/0x2e0 [ 593.981120][ T1127] ? _raw_spin_unlock+0x24/0x40 [ 593.981146][ T1127] ? __alloc_fd+0x46d/0x600 [ 593.981181][ T1127] do_sys_openat2+0x54c/0x740 [ 593.981202][ T1127] ? file_open_root+0x3d0/0x3d0 [ 593.981240][ T1127] do_sys_open+0xc3/0x140 [ 593.981267][ T1127] ? filp_open+0x70/0x70 [ 593.981289][ T1127] ? fpregs_mark_activate+0x320/0x320 [ 593.981307][ T1127] ? trace_hardirqs_off_caller+0x55/0x230 [ 593.981333][ T1127] do_fast_syscall_32+0x270/0xe8f [ 593.981360][ T1127] entry_SYSENTER_compat+0x70/0x7f [ 593.981396][ T1127] [ 593.981396][ T1127] Showing all locks held in the system: [ 593.981408][ T1127] 1 lock held by khungtaskd/1127: [ 593.981414][ T1127] #0: ffffffff897accc0 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x260 [ 593.981465][ T1127] 1 lock held by rsyslogd/9631: [ 593.981470][ T1127] #0: ffff8880a9221860 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xe3/0x100 [ 593.981500][ T1127] 2 locks held by getty/9721: [ 593.981505][ T1127] #0: ffff88809684e090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 [ 593.981603][ T1127] #1: ffffc900017db2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21d/0x1b30 [ 593.981633][ T1127] 2 locks held by getty/9722: [ 593.981637][ T1127] #0: ffff8880a8e87090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 [ 593.981662][ T1127] #1: ffffc9000176b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21d/0x1b30 [ 593.981702][ T1127] 2 locks held by getty/9723: [ 593.981707][ T1127] #0: ffff88809d6a1090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 [ 593.981732][ T1127] #1: ffffc9000175b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21d/0x1b30 [ 593.981765][ T1127] 2 locks held by getty/9724: [ 593.981769][ T1127] #0: ffff888096ba5090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 [ 593.981794][ T1127] #1: ffffc9000179b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21d/0x1b30 [ 593.981822][ T1127] 2 locks held by getty/9725: [ 593.981827][ T1127] #0: ffff8880a0665090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 [ 593.981852][ T1127] #1: ffffc900017bb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21d/0x1b30 [ 593.981893][ T1127] 2 locks held by getty/9726: [ 593.981898][ T1127] #0: ffff888098534090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 [ 593.981923][ T1127] #1: ffffc9000177b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21d/0x1b30 [ 593.981951][ T1127] 2 locks held by getty/9727: [ 593.981956][ T1127] #0: ffff8880a645e090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 [ 593.981981][ T1127] #1: ffffc9000171b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21d/0x1b30 [ 593.982011][ T1127] 2 locks held by syz-executor734/9748: [ 593.982020][ T1127] 1 lock held by syz-executor734/9753: [ 593.982025][ T1127] #0: ffff8880a3909070 (&fb_info->lock){+.+.}, at: fb_open+0xd3/0x430 [ 593.982053][ T1127] 1 lock held by syz-executor734/9754: [ 593.982057][ T1127] #0: ffff8880a3909070 (&fb_info->lock){+.+.}, at: fb_open+0xd3/0x430 [ 593.982090][ T1127] 1 lock held by syz-executor734/9755: [ 593.982095][ T1127] #0: ffff8880a3909070 (&fb_info->lock){+.+.}, at: fb_open+0xd3/0x430 [ 593.982127][ T1127] 1 lock held by syz-executor734/9756: [ 593.982143][ T1127] #0: ffff8880a3909070 (&fb_info->lock){+.+.}, at: fb_open+0xd3/0x430 [ 593.982171][ T1127] 1 lock held by syz-executor734/9757: [ 593.982176][ T1127] #0: ffff8880a3909070 (&fb_info->lock){+.+.}, at: fb_open+0xd3/0x430 [ 593.982199][ T1127] [ 593.982205][ T1127] ============================================= [ 593.982205][ T1127] [ 593.982211][ T1127] NMI backtrace for cpu 0 [ 593.982225][ T1127] CPU: 0 PID: 1127 Comm: khungtaskd Not tainted 5.6.0-rc6-syzkaller #0 [ 593.982233][ T1127] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 593.982238][ T1127] Call Trace: [ 593.982305][ T1127] dump_stack+0x188/0x20d [ 593.982331][ T1127] nmi_cpu_backtrace.cold+0x70/0xb1 [ 593.982391][ T1127] ? lapic_can_unplug_cpu.cold+0x3b/0x3b [ 593.982410][ T1127] nmi_trigger_cpumask_backtrace+0x231/0x27e [ 593.982469][ T1127] watchdog+0xa8c/0x1010 [ 593.982495][ T1127] ? reset_hung_task_detector+0x30/0x30 [ 593.982542][ T1127] kthread+0x357/0x430 [ 593.982557][ T1127] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 593.982575][ T1127] ret_from_fork+0x24/0x30 [ 593.982611][ T1127] Sending NMI from CPU 0 to CPUs 1: [ 593.983373][ C1] NMI backtrace for cpu 1 [ 593.983379][ C1] CPU: 1 PID: 9748 Comm: syz-executor734 Not tainted 5.6.0-rc6-syzkaller #0 [ 593.983385][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 593.983389][ C1] RIP: 0010:__sanitizer_cov_trace_pc+0x1a/0x50 [ 593.983399][ C1] 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 [ 593.983403][ C1] RSP: 0018:ffffc900021e74b0 EFLAGS: 00000246 [ 593.983411][ C1] RAX: ffff8880a241a500 RBX: 0000000000000050 RCX: ffffffff83b6d1aa [ 593.983416][ C1] RDX: 0000000000000000 RSI: ffffffff83b6d196 RDI: 0000000000000004 [ 593.983420][ C1] RBP: 0000000000000046 R08: ffff8880a241a500 R09: ffffed101472cf0c [ 593.983425][ C1] R10: ffffed101472cf0b R11: ffff8880a396785f R12: ffff8880000a0046 [ 593.983430][ C1] R13: ffff8880000a0000 R14: 0000000000000000 R15: 00000000ee00833a [ 593.983435][ C1] FS: 0000000000000000(0000) GS:ffff8880ae700000(0063) knlGS:000000000886a840 [ 593.983439][ C1] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 593.983444][ C1] CR2: ffffffffff600400 CR3: 00000000a3b11000 CR4: 00000000001406e0 [ 593.983449][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 593.983454][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 593.983456][ C1] Call Trace: [ 593.983460][ C1] vga16fb_fillrect+0x9c6/0x1960 [ 593.983463][ C1] ? memcpy+0x35/0x50 [ 593.983466][ C1] bit_clear_margins+0x2d5/0x4a0 [ 593.983470][ C1] ? bit_bmove+0x210/0x210 [ 593.983473][ C1] ? vesafb_probe.cold+0x1162/0x1162 [ 593.983477][ C1] fbcon_clear_margins+0x1de/0x240 [ 593.983480][ C1] fbcon_switch+0xd1b/0x1740 [ 593.983484][ C1] ? fbcon_set_def_font+0x370/0x370 [ 593.983487][ C1] ? fbcon_cursor+0x477/0x650 [ 593.983490][ C1] ? bit_clear+0x4e0/0x4e0 [ 593.983494][ C1] ? is_console_locked+0x5/0x10 [ 593.983497][ C1] ? fbcon_set_origin+0x26/0x50 [ 593.983501][ C1] redraw_screen+0x2a8/0x770 [ 593.983504][ C1] ? vesafb_probe.cold+0x1162/0x1162 [ 593.983508][ C1] ? respond_string+0x290/0x290 [ 593.983511][ C1] ? fbcon_set_palette+0x3b1/0x4a0 [ 593.983515][ C1] fbcon_modechanged+0x5bd/0x780 [ 593.983518][ C1] fbcon_update_vcs+0x3a/0x50 [ 593.983521][ C1] fb_set_var+0xad0/0xd40 [ 593.983525][ C1] ? fb_blank+0x190/0x190 [ 593.983528][ C1] ? do_fb_ioctl+0x348/0x7d0 [ 593.983531][ C1] ? lock_acquire+0x197/0x420 [ 593.983534][ C1] ? do_fb_ioctl+0x335/0x7d0 [ 593.983537][ C1] do_fb_ioctl+0x390/0x7d0 [ 593.983540][ C1] ? fb_mmap+0x550/0x550 [ 593.983544][ C1] ? lock_downgrade+0x7f0/0x7f0 [ 593.983547][ C1] ? quarantine_put+0x119/0x1c0 [ 593.983550][ C1] ? kfree+0x1eb/0x2b0 [ 593.983554][ C1] ? tomoyo_path_number_perm+0x411/0x4d0 [ 593.983558][ C1] ? lockdep_hardirqs_on+0x417/0x5d0 [ 593.983562][ C1] ? tomoyo_path_number_perm+0x238/0x4d0 [ 593.983566][ C1] ? tomoyo_execute_permission+0x470/0x470 [ 593.983569][ C1] ? trace_hardirqs_off+0x50/0x220 [ 593.983573][ C1] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 593.983577][ C1] ? do_vfs_ioctl+0x506/0x12c0 [ 593.983580][ C1] fb_compat_ioctl+0x305/0xc50 [ 593.983583][ C1] ? fb_release+0x140/0x140 [ 593.983586][ C1] ? do_sys_open+0xc3/0x140 [ 593.983590][ C1] ? fb_release+0x140/0x140 [ 593.983594][ C1] __ia32_compat_sys_ioctl+0x23d/0x2b0 [ 593.983597][ C1] do_fast_syscall_32+0x270/0xe8f [ 593.983601][ C1] entry_SYSENTER_compat+0x70/0x7f [ 593.983630][ T1127] Kernel panic - not syncing: hung_task: blocked tasks [ 593.983643][ T1127] CPU: 0 PID: 1127 Comm: khungtaskd Not tainted 5.6.0-rc6-syzkaller #0 [ 593.983648][ T1127] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 593.983652][ T1127] Call Trace: [ 593.983666][ T1127] dump_stack+0x188/0x20d [ 593.983722][ T1127] panic+0x2e3/0x75c [ 593.983740][ T1127] ? add_taint.cold+0x16/0x16 [ 593.983767][ T1127] ? cpumask_next+0x3c/0x40 [ 593.983786][ T1127] ? printk_safe_flush+0xd9/0x120 [ 593.983803][ T1127] ? watchdog+0xa8c/0x1010 [ 593.983823][ T1127] ? nmi_trigger_cpumask_backtrace+0x214/0x27e [ 593.983849][ T1127] watchdog+0xa9d/0x1010 [ 593.983877][ T1127] ? reset_hung_task_detector+0x30/0x30 [ 593.983894][ T1127] kthread+0x357/0x430 [ 593.983911][ T1127] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 593.983928][ T1127] ret_from_fork+0x24/0x30 [ 593.985292][ T1127] Kernel Offset: disabled [ 595.823396][ T1127] Rebooting in 86400 seconds..