[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[   82.646972][   T27] audit: type=1800 audit(1579939617.949:25): pid=9406 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0
[   82.667152][   T27] audit: type=1800 audit(1579939617.949:26): pid=9406 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0
[   82.688964][   T27] audit: type=1800 audit(1579939617.949:27): pid=9406 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 '10.128.0.42' (ECDSA) to the list of known hosts.
executing program
executing program
executing program
executing program
executing program
executing program
syzkaller login: [  548.680162][ T1129] INFO: task syz-executor760:9568 blocked for more than 143 seconds.
[  548.680184][ T1129]       Not tainted 5.5.0-rc7-syzkaller #0
[  548.680190][ T1129] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[  548.680198][ T1129] syz-executor760 D28296  9568   9567 0x00000004
[  548.680298][ T1129] Call Trace:
[  548.680354][ T1129]  __schedule+0x934/0x1f90
[  548.680380][ T1129]  ? __sched_text_start+0x8/0x8
[  548.680422][ T1129]  ? lock_downgrade+0x920/0x920
[  548.680440][ T1129]  ? rwlock_bug.part.0+0x90/0x90
[  548.680464][ T1129]  schedule+0xdc/0x2b0
[  548.680485][ T1129]  schedule_preempt_disabled+0x13/0x20
[  548.680522][ T1129]  __mutex_lock+0x7ab/0x13c0
[  548.680571][ T1129]  ? fb_open+0xd7/0x450
[  548.680590][ T1129]  ? mutex_trylock+0x2d0/0x2d0
[  548.680627][ T1129]  ? __kasan_check_write+0x14/0x20
[  548.680646][ T1129]  ? __mutex_unlock_slowpath+0xf0/0x6a0
[  548.680679][ T1129]  ? chrdev_open+0xca/0x6b0
[  548.680709][ T1129]  mutex_lock_nested+0x16/0x20
[  548.680723][ T1129]  ? mutex_lock_nested+0x16/0x20
[  548.680738][ T1129]  fb_open+0xd7/0x450
[  548.680764][ T1129]  ? get_fb_info.part.0+0x80/0x80
[  548.680777][ T1129]  chrdev_open+0x245/0x6b0
[  548.680795][ T1129]  ? cdev_put.part.0+0x50/0x50
[  548.680836][ T1129]  ? security_file_open+0x87/0x300
[  548.680876][ T1129]  do_dentry_open+0x4e6/0x1380
[  548.680890][ T1129]  ? __kasan_check_read+0x11/0x20
[  548.680905][ T1129]  ? cdev_put.part.0+0x50/0x50
[  548.680928][ T1129]  ? chown_common+0x5c0/0x5c0
[  548.680971][ T1129]  ? inode_permission+0xb4/0x520
[  548.680991][ T1129]  vfs_open+0xa0/0xd0
[  548.681010][ T1129]  path_openat+0x118b/0x3180
[  548.681042][ T1129]  ? path_lookupat.isra.0+0x470/0x470
[  548.681055][ T1129]  ? __lock_acquire+0x16f2/0x4a00
[  548.681089][ T1129]  ? __alloc_fd+0x487/0x620
[  548.681112][ T1129]  do_filp_open+0x1a1/0x280
[  548.681132][ T1129]  ? may_open_dev+0x100/0x100
[  548.681162][ T1129]  ? do_raw_spin_unlock+0x181/0x270
[  548.681196][ T1129]  do_sys_open+0x3fe/0x5d0
[  548.681214][ T1129]  ? filp_open+0x80/0x80
[  548.681239][ T1129]  ? trace_hardirqs_on_thunk+0x1a/0x1c
[  548.681256][ T1129]  ? trace_hardirqs_on_thunk+0x1a/0x1c
[  548.681273][ T1129]  ? do_syscall_64+0x26/0x790
[  548.681289][ T1129]  ? entry_SYSCALL_64_after_hwframe+0x49/0xbe
[  548.681306][ T1129]  ? do_syscall_64+0x26/0x790
[  548.681325][ T1129]  __x64_sys_openat+0x9d/0x100
[  548.681345][ T1129]  do_syscall_64+0xfa/0x790
[  548.681368][ T1129]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[  548.681380][ T1129] RIP: 0033:0x441419
[  548.681444][ T1129] Code: Bad RIP value.
[  548.681453][ T1129] RSP: 002b:00007ffd7b6905c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
[  548.681467][ T1129] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441419
[  548.681477][ T1129] RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c
[  548.681487][ T1129] RBP: 00000000006cb018 R08: 0000000000000004 R09: 00000000004002c8
[  548.681496][ T1129] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402190
[  548.681505][ T1129] R13: 0000000000402220 R14: 0000000000000000 R15: 0000000000000000
[  548.681534][ T1129] INFO: task syz-executor760:9569 blocked for more than 143 seconds.
[  548.681543][ T1129]       Not tainted 5.5.0-rc7-syzkaller #0
[  548.681549][ T1129] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[  548.681556][ T1129] syz-executor760 D28296  9569   9564 0x00000004
[  548.681578][ T1129] Call Trace:
[  548.681599][ T1129]  __schedule+0x934/0x1f90
[  548.681623][ T1129]  ? __sched_text_start+0x8/0x8
[  548.681637][ T1129]  ? lock_downgrade+0x920/0x920
[  548.681653][ T1129]  ? rwlock_bug.part.0+0x90/0x90
[  548.681677][ T1129]  schedule+0xdc/0x2b0
[  548.681698][ T1129]  schedule_preempt_disabled+0x13/0x20
[  548.681712][ T1129]  __mutex_lock+0x7ab/0x13c0
[  548.681731][ T1129]  ? fb_open+0xd7/0x450
[  548.681755][ T1129]  ? mutex_trylock+0x2d0/0x2d0
[  548.681772][ T1129]  ? __kasan_check_write+0x14/0x20
[  548.681790][ T1129]  ? __mutex_unlock_slowpath+0xf0/0x6a0
[  548.681803][ T1129]  ? chrdev_open+0xca/0x6b0
[  548.681833][ T1129]  mutex_lock_nested+0x16/0x20
[  548.681847][ T1129]  ? mutex_lock_nested+0x16/0x20
[  548.681863][ T1129]  fb_open+0xd7/0x450
[  548.681883][ T1129]  ? get_fb_info.part.0+0x80/0x80
[  548.681895][ T1129]  chrdev_open+0x245/0x6b0
[  548.681913][ T1129]  ? cdev_put.part.0+0x50/0x50
[  548.681933][ T1129]  ? security_file_open+0x87/0x300
[  548.681954][ T1129]  do_dentry_open+0x4e6/0x1380
[  548.681968][ T1129]  ? __kasan_check_read+0x11/0x20
[  548.681983][ T1129]  ? cdev_put.part.0+0x50/0x50
[  548.682005][ T1129]  ? chown_common+0x5c0/0x5c0
[  548.682024][ T1129]  ? inode_permission+0xb4/0x520
[  548.682044][ T1129]  vfs_open+0xa0/0xd0
[  548.682062][ T1129]  path_openat+0x118b/0x3180
[  548.682094][ T1129]  ? path_lookupat.isra.0+0x470/0x470
[  548.682107][ T1129]  ? __lock_acquire+0x16f2/0x4a00
[  548.682130][ T1129]  ? __alloc_fd+0x487/0x620
[  548.682153][ T1129]  do_filp_open+0x1a1/0x280
[  548.682173][ T1129]  ? may_open_dev+0x100/0x100
[  548.682203][ T1129]  ? do_raw_spin_unlock+0x181/0x270
[  548.682238][ T1129]  do_sys_open+0x3fe/0x5d0
[  548.682256][ T1129]  ? filp_open+0x80/0x80
[  548.682275][ T1129]  ? trace_hardirqs_on_thunk+0x1a/0x1c
[  548.682293][ T1129]  ? trace_hardirqs_on_thunk+0x1a/0x1c
[  548.682310][ T1129]  ? do_syscall_64+0x26/0x790
[  548.682326][ T1129]  ? entry_SYSCALL_64_after_hwframe+0x49/0xbe
[  548.682342][ T1129]  ? do_syscall_64+0x26/0x790
[  548.682362][ T1129]  __x64_sys_openat+0x9d/0x100
[  548.682381][ T1129]  do_syscall_64+0xfa/0x790
[  548.682402][ T1129]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[  548.682412][ T1129] RIP: 0033:0x441419
[  548.682428][ T1129] Code: Bad RIP value.
[  548.682436][ T1129] RSP: 002b:00007ffd7b6905c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
[  548.682450][ T1129] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441419
[  548.682460][ T1129] RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c
[  548.682469][ T1129] RBP: 00000000006cb018 R08: 0000000000000004 R09: 00000000004002c8
[  548.682479][ T1129] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402190
[  548.682488][ T1129] R13: 0000000000402220 R14: 0000000000000000 R15: 0000000000000000
[  548.682515][ T1129] INFO: task syz-executor760:9570 blocked for more than 143 seconds.
[  548.682524][ T1129]       Not tainted 5.5.0-rc7-syzkaller #0
[  548.682530][ T1129] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[  548.682536][ T1129] syz-executor760 D28296  9570   9566 0x00000004
[  548.682557][ T1129] Call Trace:
[  548.682578][ T1129]  __schedule+0x934/0x1f90
[  548.682602][ T1129]  ? __sched_text_start+0x8/0x8
[  548.682615][ T1129]  ? lock_downgrade+0x920/0x920
[  548.682632][ T1129]  ? rwlock_bug.part.0+0x90/0x90
[  548.682655][ T1129]  schedule+0xdc/0x2b0
[  548.682677][ T1129]  schedule_preempt_disabled+0x13/0x20
[  548.682690][ T1129]  __mutex_lock+0x7ab/0x13c0
[  548.682709][ T1129]  ? fb_open+0xd7/0x450
[  548.682727][ T1129]  ? mutex_trylock+0x2d0/0x2d0
[  548.682749][ T1129]  ? __kasan_check_write+0x14/0x20
[  548.682767][ T1129]  ? __mutex_unlock_slowpath+0xf0/0x6a0
[  548.682781][ T1129]  ? chrdev_open+0xca/0x6b0
[  548.682811][ T1129]  mutex_lock_nested+0x16/0x20
[  548.682825][ T1129]  ? mutex_lock_nested+0x16/0x20
[  548.682840][ T1129]  fb_open+0xd7/0x450
[  548.682860][ T1129]  ? get_fb_info.part.0+0x80/0x80
[  548.682873][ T1129]  chrdev_open+0x245/0x6b0
[  548.682891][ T1129]  ? cdev_put.part.0+0x50/0x50
[  548.682917][ T1129]  ? security_file_open+0x87/0x300
[  548.682940][ T1129]  do_dentry_open+0x4e6/0x1380
[  548.682953][ T1129]  ? __kasan_check_read+0x11/0x20
[  548.682975][ T1129]  ? cdev_put.part.0+0x50/0x50
[  548.683001][ T1129]  ? chown_common+0x5c0/0x5c0
[  548.683019][ T1129]  ? inode_permission+0xb4/0x520
[  548.683044][ T1129]  vfs_open+0xa0/0xd0
[  548.683062][ T1129]  path_openat+0x118b/0x3180
[  548.683094][ T1129]  ? path_lookupat.isra.0+0x470/0x470
[  548.683108][ T1129]  ? __lock_acquire+0x16f2/0x4a00
[  548.683134][ T1129]  ? __alloc_fd+0x487/0x620
[  548.683158][ T1129]  do_filp_open+0x1a1/0x280
[  548.683177][ T1129]  ? may_open_dev+0x100/0x100
[  548.683207][ T1129]  ? do_raw_spin_unlock+0x181/0x270
[  548.683242][ T1129]  do_sys_open+0x3fe/0x5d0
[  548.683259][ T1129]  ? filp_open+0x80/0x80
[  548.683279][ T1129]  ? trace_hardirqs_on_thunk+0x1a/0x1c
[  548.683296][ T1129]  ? trace_hardirqs_on_thunk+0x1a/0x1c
[  548.683313][ T1129]  ? do_syscall_64+0x26/0x790
[  548.683329][ T1129]  ? entry_SYSCALL_64_after_hwframe+0x49/0xbe
[  548.683345][ T1129]  ? do_syscall_64+0x26/0x790
[  548.683365][ T1129]  __x64_sys_openat+0x9d/0x100
[  548.683385][ T1129]  do_syscall_64+0xfa/0x790
[  548.683405][ T1129]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[  548.683415][ T1129] RIP: 0033:0x441419
[  548.683431][ T1129] Code: Bad RIP value.
[  548.683440][ T1129] RSP: 002b:00007ffd7b6905c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
[  548.683454][ T1129] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441419
[  548.683464][ T1129] RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c
[  548.683473][ T1129] RBP: 00000000006cb018 R08: 0000000000000004 R09: 00000000004002c8
[  548.683482][ T1129] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402190
[  548.683492][ T1129] R13: 0000000000402220 R14: 0000000000000000 R15: 0000000000000000
[  548.683519][ T1129] INFO: task syz-executor760:9571 blocked for more than 143 seconds.
[  548.683528][ T1129]       Not tainted 5.5.0-rc7-syzkaller #0
[  548.683534][ T1129] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[  548.683540][ T1129] syz-executor760 D28008  9571   9562 0x00000004
[  548.683561][ T1129] Call Trace:
[  548.683582][ T1129]  __schedule+0x934/0x1f90
[  548.683607][ T1129]  ? __sched_text_start+0x8/0x8
[  548.683619][ T1129]  ? lock_downgrade+0x920/0x920
[  548.683636][ T1129]  ? rwlock_bug.part.0+0x90/0x90
[  548.683660][ T1129]  schedule+0xdc/0x2b0
[  548.683681][ T1129]  schedule_preempt_disabled+0x13/0x20
[  548.683694][ T1129]  __mutex_lock+0x7ab/0x13c0
[  548.683713][ T1129]  ? fb_open+0xd7/0x450
[  548.683732][ T1129]  ? mutex_trylock+0x2d0/0x2d0
[  548.683753][ T1129]  ? __kasan_check_write+0x14/0x20
[  548.683771][ T1129]  ? __mutex_unlock_slowpath+0xf0/0x6a0
[  548.683785][ T1129]  ? chrdev_open+0xca/0x6b0
[  548.683819][ T1129]  mutex_lock_nested+0x16/0x20
[  548.683837][ T1129]  ? mutex_lock_nested+0x16/0x20
[  548.683852][ T1129]  fb_open+0xd7/0x450
[  548.683872][ T1129]  ? get_fb_info.part.0+0x80/0x80
[  548.683888][ T1129]  chrdev_open+0x245/0x6b0
[  548.683910][ T1129]  ? cdev_put.part.0+0x50/0x50
[  548.683930][ T1129]  ? security_file_open+0x87/0x300
[  548.683952][ T1129]  do_dentry_open+0x4e6/0x1380
[  548.683966][ T1129]  ? __kasan_check_read+0x11/0x20
[  548.683980][ T1129]  ? cdev_put.part.0+0x50/0x50
[  548.684003][ T1129]  ? chown_common+0x5c0/0x5c0
[  548.684022][ T1129]  ? inode_permission+0xb4/0x520
[  548.684043][ T1129]  vfs_open+0xa0/0xd0
[  548.684061][ T1129]  path_openat+0x118b/0x3180
[  548.684093][ T1129]  ? path_lookupat.isra.0+0x470/0x470
[  548.684106][ T1129]  ? __lock_acquire+0x16f2/0x4a00
[  548.684129][ T1129]  ? __alloc_fd+0x487/0x620
[  548.684152][ T1129]  do_filp_open+0x1a1/0x280
[  548.684172][ T1129]  ? may_open_dev+0x100/0x100
[  548.684202][ T1129]  ? do_raw_spin_unlock+0x181/0x270
[  548.684237][ T1129]  do_sys_open+0x3fe/0x5d0
[  548.684254][ T1129]  ? filp_open+0x80/0x80
[  548.684273][ T1129]  ? trace_hardirqs_on_thunk+0x1a/0x1c
[  548.684291][ T1129]  ? trace_hardirqs_on_thunk+0x1a/0x1c
[  548.684308][ T1129]  ? do_syscall_64+0x26/0x790
[  548.684324][ T1129]  ? entry_SYSCALL_64_after_hwframe+0x49/0xbe
[  548.684340][ T1129]  ? do_syscall_64+0x26/0x790
[  548.684359][ T1129]  __x64_sys_openat+0x9d/0x100
[  548.684379][ T1129]  do_syscall_64+0xfa/0x790
[  548.684399][ T1129]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[  548.684410][ T1129] RIP: 0033:0x441419
[  548.684424][ T1129] Code: Bad RIP value.
[  548.684433][ T1129] RSP: 002b:00007ffd7b6905c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
[  548.684447][ T1129] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441419
[  548.684456][ T1129] RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c
[  548.684466][ T1129] RBP: 00000000006cb018 R08: 0000000000000004 R09: 00000000004002c8
[  548.684475][ T1129] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402190
[  548.684484][ T1129] R13: 0000000000402220 R14: 0000000000000000 R15: 0000000000000000
[  548.684512][ T1129] INFO: task syz-executor760:9572 blocked for more than 143 seconds.
[  548.684521][ T1129]       Not tainted 5.5.0-rc7-syzkaller #0
[  548.684527][ T1129] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[  548.684533][ T1129] syz-executor760 D28296  9572   9565 0x00000004
[  548.684554][ T1129] Call Trace:
[  548.684575][ T1129]  __schedule+0x934/0x1f90
[  548.684600][ T1129]  ? __sched_text_start+0x8/0x8
[  548.684613][ T1129]  ? lock_downgrade+0x920/0x920
[  548.684634][ T1129]  ? rwlock_bug.part.0+0x90/0x90
[  548.684658][ T1129]  schedule+0xdc/0x2b0
[  548.684680][ T1129]  schedule_preempt_disabled+0x13/0x20
[  548.684693][ T1129]  __mutex_lock+0x7ab/0x13c0
[  548.684712][ T1129]  ? fb_open+0xd7/0x450
[  548.684734][ T1129]  ? mutex_trylock+0x2d0/0x2d0
[  548.684755][ T1129]  ? __kasan_check_write+0x14/0x20
[  548.684773][ T1129]  ? __mutex_unlock_slowpath+0xf0/0x6a0
[  548.684787][ T1129]  ? chrdev_open+0xca/0x6b0
[  548.684821][ T1129]  mutex_lock_nested+0x16/0x20
[  548.684834][ T1129]  ? mutex_lock_nested+0x16/0x20
[  548.684850][ T1129]  fb_open+0xd7/0x450
[  548.684870][ T1129]  ? get_fb_info.part.0+0x80/0x80
[  548.684882][ T1129]  chrdev_open+0x245/0x6b0
[  548.684904][ T1129]  ? cdev_put.part.0+0x50/0x50
[  548.684924][ T1129]  ? security_file_open+0x87/0x300
[  548.684946][ T1129]  do_dentry_open+0x4e6/0x1380
[  548.684959][ T1129]  ? __kasan_check_read+0x11/0x20
[  548.684974][ T1129]  ? cdev_put.part.0+0x50/0x50
[  548.684997][ T1129]  ? chown_common+0x5c0/0x5c0
[  548.685016][ T1129]  ? inode_permission+0xb4/0x520
[  548.685036][ T1129]  vfs_open+0xa0/0xd0
[  548.685054][ T1129]  path_openat+0x118b/0x3180
[  548.685086][ T1129]  ? path_lookupat.isra.0+0x470/0x470
[  548.685099][ T1129]  ? __lock_acquire+0x16f2/0x4a00
[  548.685122][ T1129]  ? __alloc_fd+0x487/0x620
[  548.685145][ T1129]  do_filp_open+0x1a1/0x280
[  548.685165][ T1129]  ? may_open_dev+0x100/0x100
[  548.685195][ T1129]  ? do_raw_spin_unlock+0x181/0x270
[  548.685230][ T1129]  do_sys_open+0x3fe/0x5d0
[  548.685247][ T1129]  ? filp_open+0x80/0x80
[  548.685267][ T1129]  ? trace_hardirqs_on_thunk+0x1a/0x1c
[  548.685285][ T1129]  ? trace_hardirqs_on_thunk+0x1a/0x1c
[  548.685302][ T1129]  ? do_syscall_64+0x26/0x790
[  548.685318][ T1129]  ? entry_SYSCALL_64_after_hwframe+0x49/0xbe
[  548.685333][ T1129]  ? do_syscall_64+0x26/0x790
[  548.685351][ T1129]  __x64_sys_openat+0x9d/0x100
[  548.685371][ T1129]  do_syscall_64+0xfa/0x790
[  548.685391][ T1129]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[  548.685401][ T1129] RIP: 0033:0x441419
[  548.685416][ T1129] Code: Bad RIP value.
[  548.685425][ T1129] RSP: 002b:00007ffd7b6905c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
[  548.685439][ T1129] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441419
[  548.685449][ T1129] RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c
[  548.685458][ T1129] RBP: 00000000006cb018 R08: 0000000000000004 R09: 00000000004002c8
[  548.685467][ T1129] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402190
[  548.685476][ T1129] R13: 0000000000402220 R14: 0000000000000000 R15: 0000000000000000
[  548.685500][ T1129] 
[  548.685500][ T1129] Showing all locks held in the system:
[  548.685514][ T1129] 1 lock held by khungtaskd/1129:
[  548.685519][ T1129]  #0: ffffffff899a3dc0 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x279
[  548.685577][ T1129] 1 lock held by rsyslogd/9444:
[  548.685582][ T1129]  #0: ffff88809f66b420 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110
[  548.685615][ T1129] 2 locks held by getty/9534:
[  548.685620][ T1129]  #0: ffff8880a21e2090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40
[  548.685761][ T1129]  #1: ffffc9000196b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0
[  548.685866][ T1129] 2 locks held by getty/9535:
[  548.685871][ T1129]  #0: ffff888091c1a090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40
[  548.685899][ T1129]  #1: ffffc9000198b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0
[  548.685934][ T1129] 2 locks held by getty/9536:
[  548.685939][ T1129]  #0: ffff8880a29ad090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40
[  548.685965][ T1129]  #1: ffffc9000195b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0
[  548.686000][ T1129] 2 locks held by getty/9537:
[  548.686005][ T1129]  #0: ffff888095a68090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40
[  548.686031][ T1129]  #1: ffffc900019eb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0
[  548.686065][ T1129] 2 locks held by getty/9538:
[  548.686070][ T1129]  #0: ffff8880a51c1090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40
[  548.686097][ T1129]  #1: ffffc900019cb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0
[  548.686131][ T1129] 2 locks held by getty/9539:
[  548.686136][ T1129]  #0: ffff8880a8a39090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40
[  548.686162][ T1129]  #1: ffffc900019db2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0
[  548.686196][ T1129] 2 locks held by getty/9540:
[  548.686201][ T1129]  #0: ffff88808e736090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40
[  548.686228][ T1129]  #1: ffffc9000192b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0
[  548.686263][ T1129] 2 locks held by syz-executor760/9563:
[  548.686274][ T1129] 1 lock held by syz-executor760/9568:
[  548.686279][ T1129]  #0: ffff8880a3e90070 (&fb_info->lock){+.+.}, at: fb_open+0xd7/0x450
[  548.686312][ T1129] 1 lock held by syz-executor760/9569:
[  548.686317][ T1129]  #0: ffff8880a3e90070 (&fb_info->lock){+.+.}, at: fb_open+0xd7/0x450
[  548.686349][ T1129] 1 lock held by syz-executor760/9570:
[  548.686353][ T1129]  #0: ffff8880a3e90070 (&fb_info->lock){+.+.}, at: fb_open+0xd7/0x450
[  548.686384][ T1129] 1 lock held by syz-executor760/9571:
[  548.686389][ T1129]  #0: ffff8880a3e90070 (&fb_info->lock){+.+.}, at: fb_open+0xd7/0x450
[  548.686422][ T1129] 1 lock held by syz-executor760/9572:
[  548.686427][ T1129]  #0: ffff8880a3e90070 (&fb_info->lock){+.+.}, at: fb_open+0xd7/0x450
[  548.686455][ T1129] 
[  548.686461][ T1129] =============================================
[  548.686461][ T1129] 
[  548.686469][ T1129] NMI backtrace for cpu 0
[  548.686485][ T1129] CPU: 0 PID: 1129 Comm: khungtaskd Not tainted 5.5.0-rc7-syzkaller #0
[  548.686520][ T1129] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  548.686526][ T1129] Call Trace:
[  548.686588][ T1129]  dump_stack+0x197/0x210
[  548.686612][ T1129]  nmi_cpu_backtrace.cold+0x70/0xb2
[  548.686648][ T1129]  ? vprintk_func+0x86/0x189
[  548.686703][ T1129]  ? lapic_can_unplug_cpu.cold+0x3a/0x3a
[  548.686723][ T1129]  nmi_trigger_cpumask_backtrace+0x23b/0x28b
[  548.686744][ T1129]  arch_trigger_cpumask_backtrace+0x14/0x20
[  548.686807][ T1129]  watchdog+0xb11/0x10c0
[  548.686856][ T1129]  kthread+0x361/0x430
[  548.686873][ T1129]  ? reset_hung_task_detector+0x30/0x30
[  548.686886][ T1129]  ? kthread_mod_delayed_work+0x1f0/0x1f0
[  548.686903][ T1129]  ret_from_fork+0x24/0x30
[  548.686928][ T1129] Sending NMI from CPU 0 to CPUs 1:
[  548.687735][    C1] NMI backtrace for cpu 1
[  548.687742][    C1] CPU: 1 PID: 9563 Comm: syz-executor760 Not tainted 5.5.0-rc7-syzkaller #0
[  548.687749][    C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  548.687753][    C1] RIP: 0010:write_comp_data+0x9/0x70
[  548.687765][    C1] Code: 13 00 00 8b 80 84 13 00 00 48 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 5d c3 0f 1f 00 65 4c 8b 04 25 c0 1e 02 00 <65> 8b 05 c8 26 8d 7e a9 00 01 1f 00 75 51 41 8b 80 80 13 00 00 83
[  548.687769][    C1] RSP: 0018:ffffc90001fe7390 EFLAGS: 00000286
[  548.687778][    C1] RAX: ffff8880a3578240 RBX: 0000000000000050 RCX: ffffffff83c542c0
[  548.687783][    C1] RDX: 0000000000000014 RSI: 0000000000000050 RDI: 0000000000000004
[  548.687789][    C1] RBP: ffffc90001fe7398 R08: ffff8880a3578240 R09: ffffed10431a840c
[  548.687794][    C1] R10: ffffed10431a840b R11: ffff888218d4205f R12: 0000000000000014
[  548.687800][    C1] R13: ffff8880000a0014 R14: ffff8880000a0000 R15: 0000000000000000
[  548.687806][    C1] FS:  000000000085c880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
[  548.687810][    C1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  548.687816][    C1] CR2: ffffffffff600400 CR3: 00000000a89bd000 CR4: 00000000001406e0
[  548.687821][    C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  548.687826][    C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  548.687829][    C1] Call Trace:
[  548.687833][    C1]  ? __sanitizer_cov_trace_cmp4+0x16/0x20
[  548.687837][    C1]  vga16fb_fillrect+0xa20/0x19b0
[  548.687841][    C1]  bit_clear_margins+0x30b/0x530
[  548.687844][    C1]  ? bit_bmove+0x270/0x270
[  548.687848][    C1]  ? efifb_probe.cold+0x181f/0x181f
[  548.687852][    C1]  fbcon_clear_margins+0x1e9/0x250
[  548.687856][    C1]  fbcon_switch+0xd7f/0x17f0
[  548.687859][    C1]  ? fbcon_set_def_font+0x360/0x360
[  548.687863][    C1]  ? fbcon_cursor+0x48c/0x660
[  548.687868][    C1]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[  548.687872][    C1]  ? fbcon_set_origin+0x2b/0x50
[  548.687875][    C1]  ? fbcon_scrolldelta+0x1220/0x1220
[  548.687880][    C1]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[  548.687883][    C1]  redraw_screen+0x2b6/0x7d0
[  548.687887][    C1]  ? efifb_probe.cold+0x181f/0x181f
[  548.687890][    C1]  ? respond_string+0x2c0/0x2c0
[  548.687894][    C1]  ? fbcon_set_palette+0x3c4/0x4a0
[  548.687898][    C1]  fbcon_modechanged+0x5c3/0x790
[  548.687901][    C1]  fbcon_update_vcs+0x42/0x50
[  548.687905][    C1]  fb_set_var+0xb32/0xdd0
[  548.687908][    C1]  ? fb_blank+0x1a0/0x1a0
[  548.687912][    C1]  ? lock_acquire+0x190/0x410
[  548.687915][    C1]  ? __mutex_lock+0x458/0x13c0
[  548.687918][    C1]  ? down+0x50/0x90
[  548.687922][    C1]  ? do_fb_ioctl+0x335/0x7d0
[  548.687925][    C1]  do_fb_ioctl+0x390/0x7d0
[  548.687928][    C1]  ? fb_mmap+0x520/0x520
[  548.687933][    C1]  ? tomoyo_path_number_perm+0x214/0x520
[  548.687936][    C1]  ? find_held_lock+0x35/0x130
[  548.687940][    C1]  ? tomoyo_path_number_perm+0x214/0x520
[  548.687943][    C1]  ? lock_downgrade+0x920/0x920
[  548.687946][    C1]  ? lockdep_hardirqs_on+0x421/0x5e0
[  548.687950][    C1]  ? tomoyo_path_number_perm+0x454/0x520
[  548.687953][    C1]  ? __do_page_fault+0x56a/0xd80
[  548.687955][    C1]  fb_ioctl+0xe6/0x130
[  548.687958][    C1]  ? do_fb_ioctl+0x7d0/0x7d0
[  548.687962][    C1]  do_vfs_ioctl+0x977/0x14e0
[  548.687965][    C1]  ? compat_ioctl_preallocate+0x220/0x220
[  548.687968][    C1]  ? __kasan_check_write+0x14/0x20
[  548.687971][    C1]  ? up_read+0x1cd/0x810
[  548.687974][    C1]  ? tomoyo_file_ioctl+0x23/0x30
[  548.687978][    C1]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[  548.687981][    C1]  ? security_file_ioctl+0x8d/0xc0
[  548.687984][    C1]  ksys_ioctl+0xab/0xd0
[  548.687986][    C1]  __x64_sys_ioctl+0x73/0xb0
[  548.687989][    C1]  do_syscall_64+0xfa/0x790
[  548.687993][    C1]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[  548.687995][    C1] RIP: 0033:0x441419
[  548.688006][    C1] 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
[  548.688010][    C1] RSP: 002b:00007ffd7b6905c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[  548.688017][    C1] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441419
[  548.688022][    C1] RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000003
[  548.688027][    C1] RBP: 00000000006cb018 R08: 00000000004002c8 R09: 00000000004002c8
[  548.688031][    C1] R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000402190
[  548.688036][    C1] R13: 0000000000402220 R14: 0000000000000000 R15: 0000000000000000
[  548.688047][ T1129] Kernel panic - not syncing: hung_task: blocked tasks
[  548.688061][ T1129] CPU: 0 PID: 1129 Comm: khungtaskd Not tainted 5.5.0-rc7-syzkaller #0
[  548.688067][ T1129] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  548.688071][ T1129] Call Trace:
[  548.688085][ T1129]  dump_stack+0x197/0x210
[  548.688121][ T1129]  panic+0x2e3/0x75c
[  548.688140][ T1129]  ? add_taint.cold+0x16/0x16
[  548.688159][ T1129]  ? __sanitizer_cov_trace_cmp4+0x16/0x20
[  548.688177][ T1129]  ? printk_safe_flush+0xf2/0x140
[  548.688194][ T1129]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[  548.688212][ T1129]  ? nmi_trigger_cpumask_backtrace+0x224/0x28b
[  548.688230][ T1129]  ? nmi_trigger_cpumask_backtrace+0x21b/0x28b
[  548.688248][ T1129]  watchdog+0xb22/0x10c0
[  548.688272][ T1129]  kthread+0x361/0x430
[  548.688289][ T1129]  ? reset_hung_task_detector+0x30/0x30
[  548.688304][ T1129]  ? kthread_mod_delayed_work+0x1f0/0x1f0
[  548.688321][ T1129]  ret_from_fork+0x24/0x30
[  548.690260][ T1129] Kernel Offset: disabled
[  551.066897][ T1129] Rebooting in 86400 seconds..