[  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

syzkaller login: [   34.926684][ T8447] sshd (8447) used greatest stack depth: 11016 bytes left
Warning: Permanently added '10.128.1.61' (ECDSA) to the list of known hosts.
executing program
[   49.221468][ T8487] loop0: detected capacity change from 4096 to 0
[   49.229869][ T8487] Quota error (device loop0): v2_read_file_info: Free block number too big (0 >= 0).
[   49.239457][ T8487] EXT4-fs warning (device loop0): ext4_enable_quotas:6392: Failed to enable quota tracking (type=0, err=-117). Please run e2fsck to fix.
[   49.253665][ T8487] EXT4-fs (loop0): mount failed
[   55.192820][ T8486] kmemleak: 1 new suspected memory leaks (see /sys/kernel/debug/kmemleak)
BUG: memory leak
unreferenced object 0xffff88810e72c080 (size 64):
  comm "syz-executor604", pid 8487, jiffies 4294942188 (age 8.060s)
  hex dump (first 32 bytes):
    00 d8 e4 0a 81 88 ff ff 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 0a 00 00 00 48 00 00 00  ............H...
  backtrace:
    [<000000004bb212fb>] v2_read_file_info+0x1ae/0x430
    [<00000000354a35cb>] dquot_load_quota_sb+0x351/0x650
    [<0000000065e9c328>] dquot_load_quota_inode+0xda/0x160
    [<0000000075eab84f>] ext4_enable_quotas+0x1b2/0x2f0
    [<00000000eb15d61a>] ext4_fill_super+0x3bc5/0x5ac0
    [<00000000c6711e1f>] mount_bdev+0x223/0x260
    [<00000000e8207ad9>] legacy_get_tree+0x2b/0x90
    [<00000000594f9fef>] vfs_get_tree+0x28/0x100
    [<000000003bdb17b9>] path_mount+0xc5e/0x1170
    [<00000000be617ba6>] __x64_sys_mount+0x18e/0x1d0
    [<00000000fbbc7eaa>] do_syscall_64+0x2d/0x70
    [<000000003d151a76>] entry_SYSCALL_64_after_hwframe+0x44/0xa9