INIT: Entering runlevel: 2

[info] Using makefile-style concurrent boot in runlevel 2.
[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[....] 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 '10.128.10.4' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   30.268308] EXT4-fs (sda1): shut down requested (0)
[   30.536562] ------------[ cut here ]------------
[   30.541385] DEBUG_LOCKS_WARN_ON(sem->owner != get_current())
[   30.541443] WARNING: CPU: 0 PID: 4473 at kernel/locking/rwsem.c:133 up_write+0x1c6/0x210
[   30.555415] Kernel panic - not syncing: panic_on_warn set ...
[   30.555415] 
[   30.562763] CPU: 0 PID: 4473 Comm: syzkaller097542 Not tainted 4.16.0+ #2
[   30.569670] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   30.579007] Call Trace:
[   30.581575]  dump_stack+0x1b9/0x29f
[   30.585192]  ? arch_local_irq_restore+0x52/0x52
[   30.589840]  ? up_write+0x1b0/0x210
[   30.593444]  panic+0x22f/0x4de
[   30.596621]  ? add_taint.cold.5+0x16/0x16
[   30.600750]  ? __warn.cold.8+0x148/0x1a3
[   30.604798]  ? __warn.cold.8+0x117/0x1a3
[   30.608836]  ? up_write+0x1c6/0x210
[   30.612437]  __warn.cold.8+0x163/0x1a3
[   30.616300]  ? up_write+0x1c6/0x210
[   30.619901]  report_bug+0x252/0x2d0
[   30.623503]  do_error_trap+0x1bc/0x470
[   30.627365]  ? math_error+0x3f0/0x3f0
[   30.631152]  ? vprintk_func+0x81/0xe7
[   30.634927]  ? printk+0x9e/0xba
[   30.638186]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   30.643015]  do_invalid_op+0x1b/0x20
[   30.646708]  invalid_op+0x1b/0x40
[   30.650140] RIP: 0010:up_write+0x1c6/0x210
[   30.654346] RSP: 0018:ffff8801b9587670 EFLAGS: 00010286
[   30.659687] RAX: 0000000000000030 RBX: ffff8801cd7d8f00 RCX: ffffffff815ecc1d
[   30.666934] RDX: 0000000000000000 RSI: ffffffff815f1a01 RDI: 0000000000000001
[   30.674180] RBP: ffff8801b95876f8 R08: ffff8801ad4a6140 R09: fffffbfff1170628
[   30.681434] R10: fffffbfff1170628 R11: ffffffff88b83143 R12: 1ffff100372b0ece
[   30.688680] R13: dffffc0000000000 R14: ffff8801b95876d0 R15: ffff8801cd7d8f58
[   30.695936]  ? console_unlock+0x8ad/0x1100
[   30.700154]  ? vprintk_func+0x81/0xe7
[   30.703934]  ? up_read+0x110/0x110
[   30.707453]  ? lock_release+0xa10/0xa10
[   30.711415]  ? thaw_super+0x119/0x270
[   30.715210]  percpu_up_write+0xcd/0x110
[   30.719158]  ? __percpu_up_read+0x50/0x50
[   30.723281]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[   30.728791]  thaw_super+0x205/0x270
[   30.732393]  thaw_bdev+0x162/0x1a0
[   30.735910]  ext4_ioctl+0x12da/0x4190
[   30.739685]  ? ext4_ioctl_group_add+0x560/0x560
[   30.744329]  ? kasan_check_read+0x11/0x20
[   30.748449]  ? rcu_is_watching+0x85/0x140
[   30.752584]  ? rcu_bh_force_quiescent_state+0x20/0x20
[   30.757755]  ? rcu_bh_force_quiescent_state+0x20/0x20
[   30.762928]  ? kernel_text_address+0x79/0xf0
[   30.767315]  ? __unwind_start+0x166/0x330
[   30.771437]  ? __kernel_text_address+0xd/0x40
[   30.775908]  ? unwind_get_return_address+0x61/0xa0
[   30.780813]  ? __save_stack_trace+0x7e/0xd0
[   30.785113]  ? save_stack+0xa9/0xd0
[   30.788715]  ? save_stack+0x43/0xd0
[   30.792315]  ? __kasan_slab_free+0x11a/0x170
[   30.796697]  ? kasan_slab_free+0xe/0x10
[   30.800646]  ? kmem_cache_free+0x86/0x2d0
[   30.804766]  ? putname+0xf2/0x130
[   30.808190]  ? do_sys_open+0x57f/0x770
[   30.812054]  ? SyS_creat+0x27/0x30
[   30.815573]  ? do_syscall_64+0x29e/0x9d0
[   30.819612]  ? entry_SYSCALL_64_after_hwframe+0x42/0xb7
[   30.824958]  ? kasan_check_read+0x11/0x20
[   30.829080]  ? do_raw_spin_unlock+0x9e/0x2e0
[   30.833462]  ? do_raw_spin_trylock+0x1b0/0x1b0
[   30.838037]  ? kasan_check_write+0x14/0x20
[   30.842252]  ? do_raw_spin_lock+0xc1/0x200
[   30.846464]  ? trace_hardirqs_off+0xd/0x10
[   30.850767]  ? _raw_spin_unlock_irqrestore+0x63/0xc0
[   30.855845]  ? debug_check_no_obj_freed+0x2ff/0x584
[   30.860840]  ? ext4_ioctl_group_add+0x560/0x560
[   30.865487]  do_vfs_ioctl+0x1cf/0x1650
[   30.869353]  ? ioctl_preallocate+0x2e0/0x2e0
[   30.873737]  ? fget_raw+0x20/0x20
[   30.877166]  ? rcu_read_lock_sched_held+0x108/0x120
[   30.882155]  ? kmem_cache_free+0x25c/0x2d0
[   30.886364]  ? putname+0xf7/0x130
[   30.889801]  ? do_sys_open+0x3b7/0x770
[   30.893668]  ? security_file_ioctl+0x9b/0xd0
[   30.898050]  ksys_ioctl+0xa9/0xd0
[   30.901477]  SyS_ioctl+0x24/0x30
[   30.904819]  ? ksys_ioctl+0xd0/0xd0
[   30.908425]  do_syscall_64+0x29e/0x9d0
[   30.912288]  ? vmalloc_sync_all+0x30/0x30
[   30.916413]  ? trace_hardirqs_on_thunk+0x1a/0x1c
[   30.921147]  ? syscall_return_slowpath+0x5c0/0x5c0
[   30.926052]  ? syscall_return_slowpath+0x30f/0x5c0
[   30.930973]  ? entry_SYSCALL_64_after_hwframe+0x52/0xb7
[   30.936313]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   30.941132]  entry_SYSCALL_64_after_hwframe+0x42/0xb7
[   30.946297] RIP: 0033:0x43fcb9
[   30.949462] RSP: 002b:00007ffcd3fefe38 EFLAGS: 00000213 ORIG_RAX: 0000000000000010
[   30.957146] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fcb9
[   30.964390] RDX: 0000000020000a80 RSI: 000000008004587d RDI: 0000000000000003
[   30.971634] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
[   30.978880] R10: 00000000004002c8 R11: 0000000000000213 R12: 00000000004015e0
[   30.986125] R13: 0000000000401670 R14: 0000000000000000 R15: 0000000000000000
[   30.993826] Dumping ftrace buffer:
[   30.997337]    (ftrace buffer empty)
[   31.001022] Kernel Offset: disabled
[   31.004625] Rebooting in 86400 seconds..