[  OK  ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
         Starting Load/Save RF Kill Switch Status...
[  OK  ] Started Update UTMP about System Runlevel Changes.
[  OK  ] Started Load/Save RF Kill Switch Status.


Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.100' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [  757.446730] audit: type=1400 audit(1601357270.954:8): avc:  denied  { execmem } for  pid=6396 comm="syz-executor010" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1
[  757.481729] EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue
[ 1001.350390] INFO: task syz-executor010:6397 blocked for more than 140 seconds.
[ 1001.357985]       Not tainted 4.14.198-syzkaller #0
[ 1001.364005] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 1001.372164] syz-executor010 D27160  6397   6396 0x00000004
[ 1001.377776] Call Trace:
[ 1001.380424]  __schedule+0x88b/0x1de0
[ 1001.384243]  ? mark_held_locks+0xa6/0xf0
[ 1001.388291]  ? io_schedule_timeout+0x140/0x140
[ 1001.392956]  schedule+0x8d/0x1b0
[ 1001.396367]  io_schedule+0xb5/0x120
[ 1001.399979]  bit_wait_io+0x12/0x90
[ 1001.404214]  __wait_on_bit_lock+0xc2/0x1d0
[ 1001.408451]  ? bit_wait+0x90/0x90
[ 1001.412028]  ? mark_buffer_dirty_inode+0x2ce/0x3a0
[ 1001.416997]  out_of_line_wait_on_bit_lock+0xbc/0xd0
[ 1001.422047]  ? __wait_on_bit_lock+0x1d0/0x1d0
[ 1001.426564]  ? bit_waitqueue+0x30/0x30
[ 1001.430548]  __lock_buffer+0x43/0x50
[ 1001.434256]  __sync_dirty_buffer+0x214/0x290
[ 1001.438679]  __ext4_handle_dirty_metadata+0x169/0x480
[ 1001.443937]  ext4_convert_inline_data_nolock+0x4ce/0xb40
[ 1001.449386]  ? ext4_read_inline_page+0x560/0x560
[ 1001.454188]  ext4_convert_inline_data+0x2ae/0x2fc
[ 1001.459020]  ? ext4_inline_data_truncate+0x920/0x920
[ 1001.464177]  ext4_fallocate+0x106/0x1d80
[ 1001.468277]  ? rcu_lockdep_current_cpu_online+0xed/0x140
[ 1001.473774]  ? ext4_insert_range+0x1340/0x1340
[ 1001.478408]  vfs_fallocate+0x346/0x790
[ 1001.482328]  SyS_fallocate+0x4a/0x80
[ 1001.486035]  ? compat_SyS_ftruncate+0x20/0x20
[ 1001.490578]  do_syscall_64+0x1d5/0x640
[ 1001.494511]  entry_SYSCALL_64_after_hwframe+0x46/0xbb
[ 1001.499678] RIP: 0033:0x445489
[ 1001.503028] RSP: 002b:00007ffebbb4f898 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
[ 1001.510785] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000445489
[ 1001.518054] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
[ 1001.525466] RBP: 00000000006d1018 R08: 0000000000000001 R09: 0000000000000001
[ 1001.533119] R10: 000000000000ffe0 R11: 0000000000000246 R12: 00000000004025f0
[ 1001.540402] R13: 0000000000402680 R14: 0000000000000000 R15: 0000000000000000
[ 1001.547681] 
[ 1001.547681] Showing all locks held in the system:
[ 1001.554048] 1 lock held by khungtaskd/1068:
[ 1001.558442]  #0:  (tasklist_lock){.+.+}, at: [<ffffffff814777f4>] debug_show_all_locks+0x7c/0x21a
[ 1001.567549] 2 locks held by syz-executor010/6397:
[ 1001.572436]  #0:  (sb_writers#3){.+.+}, at: [<ffffffff818c80f1>] vfs_fallocate+0x5c1/0x790
[ 1001.580926]  #1:  (&ei->xattr_sem){++++}, at: [<ffffffff81c0938d>] ext4_convert_inline_data+0x19d/0x2fc
[ 1001.590516] 
[ 1001.592129] =============================================
[ 1001.592129] 
[ 1001.599116] NMI backtrace for cpu 1
[ 1001.602769] CPU: 1 PID: 1068 Comm: khungtaskd Not tainted 4.14.198-syzkaller #0
[ 1001.610206] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 1001.619545] Call Trace:
[ 1001.622182]  dump_stack+0x1b2/0x283
[ 1001.625787]  nmi_cpu_backtrace.cold+0x57/0x93
[ 1001.630303]  ? irq_force_complete_move.cold+0x7c/0x7c
[ 1001.635483]  nmi_trigger_cpumask_backtrace+0x13a/0x17f
[ 1001.640764]  watchdog+0x5b9/0xb40
[ 1001.644195]  ? hungtask_pm_notify+0x50/0x50
[ 1001.648529]  kthread+0x30d/0x420
[ 1001.651872]  ? kthread_create_on_node+0xd0/0xd0
[ 1001.656518]  ret_from_fork+0x24/0x30
[ 1001.660300] Sending NMI from CPU 1 to CPUs 0:
[ 1001.664836] NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff8655830e
[ 1001.666276] Kernel panic - not syncing: hung_task: blocked tasks
[ 1001.678165] CPU: 1 PID: 1068 Comm: khungtaskd Not tainted 4.14.198-syzkaller #0
[ 1001.685607] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 1001.694936] Call Trace:
[ 1001.697501]  dump_stack+0x1b2/0x283
[ 1001.701181]  panic+0x1f9/0x42d
[ 1001.704349]  ? add_taint.cold+0x16/0x16
[ 1001.708303]  watchdog+0x5ca/0xb40
[ 1001.711750]  ? hungtask_pm_notify+0x50/0x50
[ 1001.716049]  kthread+0x30d/0x420
[ 1001.719387]  ? kthread_create_on_node+0xd0/0xd0
[ 1001.724036]  ret_from_fork+0x24/0x30
[ 1001.729120] Kernel Offset: disabled
[ 1001.732736] Rebooting in 86400 seconds..