[  OK  ] Reached target Login Prompts.
[  OK  ] Reached target Multi-User System.
[  OK  ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
[  OK  ] Started Update UTMP about System Runlevel Changes.


Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.196' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   32.415505] audit: type=1400 audit(1601445607.360:8): avc:  denied  { execmem } for  pid=6350 comm="syz-executor951" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1
[   32.425604] F2FS-fs (loop0): Magic Mismatch, valid(0xf2f52010) - read(0x0)
[   32.445133] F2FS-fs (loop0): Can't find valid F2FS filesystem in 2th superblock
[   32.453479] F2FS-fs (loop0): invalid crc value
[   32.507112] F2FS-fs (loop0): Try to recover 2th superblock, ret: 0
[   32.513793] F2FS-fs (loop0): Mounted with checkpoint version = 27d57943
[   32.522030] SELinux: (dev loop0, type f2fs) getxattr errno 2
[   32.528413] ------------[ cut here ]------------
[   32.533155] kernel BUG at fs/f2fs/inode.c:600!
[   32.538930] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[   32.544275] Modules linked in:
[   32.547441] CPU: 0 PID: 6350 Comm: syz-executor951 Not tainted 4.14.198-syzkaller #0
[   32.555290] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   32.564618] task: ffff88809b4ce540 task.stack: ffff888086440000
[   32.570650] RIP: 0010:f2fs_evict_inode+0xd97/0x1070
[   32.575634] RSP: 0018:ffff888086447aa0 EFLAGS: 00010297
[   32.580968] RAX: ffff88809b4ce540 RBX: ffff888097fb6600 RCX: 0000000000000001
[   32.589181] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888097fb6684
[   32.596457] RBP: ffff888082aa6000 R08: 0000000000000001 R09: 0000000000000001
[   32.603700] R10: 0000000000000000 R11: ffff88809b4ce540 R12: ffff888097faa2c0
[   32.610940] R13: ffff888097fab068 R14: ffff888082aa63d0 R15: dffffc0000000000
[   32.618214] FS:  0000000001d1f880(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
[   32.626440] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   32.632298] CR2: 0000561cb953b4d0 CR3: 00000000a9b11000 CR4: 00000000001406f0
[   32.639554] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   32.646796] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   32.654049] Call Trace:
[   32.656612]  ? f2fs_write_inode+0x1d0/0x1d0
[   32.660906]  evict+0x2c8/0x700
[   32.664070]  iput+0x458/0x7e0
[   32.667147]  ? f2fs_show_options+0xdf0/0xdf0
[   32.671526]  dentry_unlink_inode+0x25c/0x310
[   32.675919]  __dentry_kill+0x320/0x550
[   32.679777]  ? dput.part.0+0x27/0x710
[   32.683546]  dput.part.0+0x56f/0x710
[   32.687244]  shrink_dcache_for_umount+0xcb/0x270
[   32.691972]  generic_shutdown_super+0x68/0x370
[   32.696528]  kill_block_super+0x95/0xe0
[   32.700474]  deactivate_locked_super+0x6c/0xd0
[   32.705028]  mount_fs+0x23a/0x2a0
[   32.708453]  vfs_kern_mount.part.0+0x5b/0x470
[   32.712922]  do_mount+0xe53/0x2a00
[   32.716433]  ? copy_mount_string+0x40/0x40
[   32.720638]  ? rcu_read_lock_sched_held+0x16c/0x1d0
[   32.725622]  ? copy_mnt_ns+0xa30/0xa30
[   32.729494]  ? copy_mount_options+0x1fa/0x2f0
[   32.733972]  ? copy_mnt_ns+0xa30/0xa30
[   32.737829]  SyS_mount+0xa8/0x120
[   32.741252]  ? copy_mnt_ns+0xa30/0xa30
[   32.745112]  do_syscall_64+0x1d5/0x640
[   32.748974]  entry_SYSCALL_64_after_hwframe+0x46/0xbb
[   32.754133] RIP: 0033:0x44703a
[   32.757296] RSP: 002b:00007ffcb92c5f08 EFLAGS: 00000297 ORIG_RAX: 00000000000000a5
[   32.764976] RAX: ffffffffffffffda RBX: 00007ffcb92c5f60 RCX: 000000000044703a
[   32.772220] RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffcb92c5f20
[   32.779461] RBP: 00007ffcb92c5f20 R08: 00007ffcb92c5f60 R09: 00007ffc00000015
[   32.786712] R10: 0000000000000000 R11: 0000000000000297 R12: 0000000000000008
[   32.793962] R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003
[   32.801208] Code: ad fe 48 c7 c2 e0 3d db 86 be 18 01 00 00 48 c7 c7 40 3e db 86 c6 05 55 d5 df 05 01 e8 ac fe 98 fe e9 35 fc ff ff e8 c9 1b ad fe <0f> 0b 48 8b 7c 24 28 e8 8d ee d6 fe e9 ec f2 ff ff e8 83 ee d6 
[   32.820266] RIP: f2fs_evict_inode+0xd97/0x1070 RSP: ffff888086447aa0
[   32.828146] ---[ end trace f3b06f564c5dba73 ]---
[   32.832900] Kernel panic - not syncing: Fatal exception
[   32.839269] Kernel Offset: disabled
[   32.842875] Rebooting in 86400 seconds..