[  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 '10.128.1.12' (ECDSA) to the list of known hosts.
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syzkaller login: [   28.842797] ------------[ cut here ]------------
[   28.847587] kernel BUG at fs/buffer.c:3106!
[   28.859468] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[   28.864855] Modules linked in:
[   28.868050] CPU: 1 PID: 7968 Comm: syz-executor149 Not tainted 4.14.278-syzkaller #0
[   28.875918] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   28.885456] task: ffff888095c204c0 task.stack: ffff8880b3600000
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[   28.891524] RIP: 0010:submit_bh_wbc+0x573/0x6f0
[   28.896194] RSP: 0000:ffff8880b3607970 EFLAGS: 00010297
[   28.901559] RAX: ffff888095c204c0 RBX: ffff88808e2835e8 RCX: 0000000000000000
[   28.908826] RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000000000000000
[   28.916106] RBP: ffff8880b4aba880 R08: 0000000000000000 R09: 0000000000000000
[   28.923376] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000003000
[   28.930645] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8880b3607a38
[   28.937914] FS:  00007f217fe85700(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000
[   28.946137] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   28.952018] CR2: 0000555c07b65008 CR3: 000000009bcbc000 CR4: 00000000003406e0
[   28.959291] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   28.967166] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   28.974703] Call Trace:
[   28.977334]  read_mmp_block+0x119/0x5b0
[   28.981397]  ? write_mmp_block+0x1fb/0x2d0
[   28.985635]  ext4_multi_mount_protect+0x438/0x9c0
[   28.990473]  ? __dump_mmp_msg+0xa0/0xa0
[   28.994454]  ext4_fill_super+0x8e41/0xb3c0
[   28.998695]  ? ext4_calculate_overhead+0x10b0/0x10b0
[   29.003794]  ? lock_downgrade+0x740/0x740
[   29.007940]  ? snprintf+0xa5/0xd0
[   29.011396]  ? ns_test_super+0x50/0x50
[   29.015295]  ? set_blocksize+0x125/0x380
[   29.019352]  mount_bdev+0x2b3/0x360
[   29.022977]  ? ext4_calculate_overhead+0x10b0/0x10b0
[   29.028075]  mount_fs+0x92/0x2a0
[   29.031440]  vfs_kern_mount.part.0+0x5b/0x470
[   29.035936]  do_mount+0xe65/0x2a10
[   29.039515]  ? do_raw_spin_unlock+0x164/0x220
[   29.044010]  ? copy_mount_string+0x40/0x40
[   29.048240]  ? rcu_read_lock_sched_held+0x16c/0x1d0
[   29.053251]  ? copy_mnt_ns+0xa30/0xa30
[   29.057132]  ? copy_mount_options+0x1fa/0x2f0
[   29.061631]  ? copy_mnt_ns+0xa30/0xa30
[   29.065511]  SyS_mount+0xa8/0x120
[   29.068955]  ? copy_mnt_ns+0xa30/0xa30
[   29.072840]  do_syscall_64+0x1d5/0x640
[   29.076733]  entry_SYSCALL_64_after_hwframe+0x46/0xbb
[   29.081913] RIP: 0033:0x7f217fedabaa
[   29.085617] RSP: 002b:00007f217fe85018 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
[   29.093334] RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007f217fedabaa
[   29.100595] RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f217fe85080
[   29.107853] RBP: 0000000000000004 R08: 00007f217fe850c0 R09: 0000000000000000
[   29.115111] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000
[   29.122369] R13: 00000000200003c8 R14: 00007f217fe85080 R15: 0000000020000100
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[   29.129633] Code: 1c c2 ff f0 80 63 01 f7 e9 66 fb ff ff 48 8d 43 10 4c 8d 7b 20 48 89 44 24 08 e9 55 fc ff ff e8 34 1c c2 ff 0f 0b e8 2d 1c c2 ff <0f> 0b e8 26 1c c2 ff 0f 0b e8 1f 1c c2 ff 0f 0b e8 18 1c c2 ff 
[   29.148833] RIP: submit_bh_wbc+0x573/0x6f0 RSP: ffff8880b3607970
[   29.167886] ---[ end trace 14a956aeb989f411 ]---
[   29.176021] Kernel panic - not syncing: Fatal exception
[   29.181587] Kernel Offset: disabled
[   29.185203] Rebooting in 86400 seconds..