[  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 '10.128.10.5' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   38.158340] EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue
[   38.167475] Quota error (device loop0): qtree_write_dquot: Error -1986711217 occurred while creating quota
[   38.178628] EXT4-fs error (device loop0): ext4_mb_generate_buddy:754: group 0, block bitmap and bg descriptor inconsistent: 32768 vs 25 free clusters
[   38.192982] Quota error (device loop0): write_blk: dquota write failed
[   38.200153] Quota error (device loop0): qtree_write_dquot: Error -28 occurred while creating quota
executing program
[   38.282575] EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue
[   38.291280] Quota error (device loop0): qtree_write_dquot: Error -1986711217 occurred while creating quota
[   38.301977] EXT4-fs error (device loop0): ext4_mb_generate_buddy:754: group 0, block bitmap and bg descriptor inconsistent: 32768 vs 25 free clusters
[   38.316025] Quota error (device loop0): write_blk: dquota write failed
[   38.322710] Quota error (device loop0): qtree_write_dquot: Error -28 occurred while creating quota
[   38.333982] list_del corruption. prev->next should be ffff88808dfc4e20, but was ffffffff8903d2e0
[   38.343151] ------------[ cut here ]------------
[   38.347881] kernel BUG at lib/list_debug.c:51!
[   38.352491] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[   38.357838] Modules linked in:
[   38.361003] CPU: 0 PID: 7991 Comm: syz-executor330 Not tainted 4.14.211-syzkaller #0
[   38.368866] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   38.378207] task: ffff8880b335e540 task.stack: ffff8880b2978000
[   38.384336] RIP: 0010:__list_del_entry_valid.cold+0xf/0x55
[   38.389925] RSP: 0018:ffff8880b297fb30 EFLAGS: 00010282
[   38.395255] RAX: 0000000000000054 RBX: ffff88808dfc4c40 RCX: 0000000000000000
[   38.402508] RDX: 0000000000000000 RSI: ffffffff878bbac0 RDI: ffffed101652ff5c
[   38.409835] RBP: ffff88808dfc4e20 R08: 0000000000000054 R09: 0000000000000000
[   38.417079] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff8995316f
[   38.424332] R13: ffff88808dfc4c60 R14: ffff88808dfc4e20 R15: dffffc0000000000
[   38.431572] FS:  0000000002628880(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000
[   38.439765] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   38.445616] CR2: 00000000026318b8 CR3: 0000000098fdb000 CR4: 00000000001406f0
[   38.452866] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   38.460114] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   38.467443] Call Trace:
[   38.470020]  dquot_disable+0xd72/0x1810
[   38.473968]  ? dquot_file_open+0x90/0x90
[   38.478002]  ? lock_acquire+0x170/0x3f0
[   38.481967]  ? lock_downgrade+0x740/0x740
[   38.486087]  ? do_raw_spin_unlock+0x164/0x220
[   38.490552]  ext4_quota_off+0xd8/0x3a0
[   38.494405]  ? ext4_unregister_li_request+0x22c/0x2b0
[   38.499565]  ext4_put_super+0x86/0xf00
[   38.503420]  ? fsnotify_unmount_inodes+0x1b4/0x210
[   38.508317]  ? ext4_quota_write+0x490/0x490
[   38.512612]  generic_shutdown_super+0x144/0x370
[   38.517252]  kill_block_super+0x95/0xe0
[   38.521192]  deactivate_locked_super+0x6c/0xd0
[   38.525741]  deactivate_super+0x7f/0xa0
[   38.529700]  cleanup_mnt+0x186/0x2c0
[   38.533401]  task_work_run+0x11f/0x190
[   38.537269]  exit_to_usermode_loop+0x1ad/0x200
[   38.541821]  do_syscall_64+0x4a3/0x640
[   38.545777]  entry_SYSCALL_64_after_hwframe+0x46/0xbb
[   38.551044] RIP: 0033:0x4481f7
[   38.554214] RSP: 002b:00007ffdd042bca8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6
[   38.561890] RAX: 0000000000000000 RBX: 00007ffdd042ce20 RCX: 00000000004481f7
[   38.569127] RDX: 0000000000400bb0 RSI: 0000000000000002 RDI: 00007ffdd042bd50
[   38.576362] RBP: 0000000000009595 R08: 0000000000000000 R09: 0000000000000009
[   38.583600] R10: 0000000000000005 R11: 0000000000000202 R12: 00007ffdd042cdc0
[   38.590841] R13: 0000000002629880 R14: 0000000000000000 R15: 0000000000000000
[   38.598086] Code: 87 e8 9c f8 23 fe 0f 0b 48 89 f1 48 c7 c7 e0 d1 cc 87 4c 89 e6 e8 88 f8 23 fe 0f 0b 48 89 ee 48 c7 c7 80 d3 cc 87 e8 77 f8 23 fe <0f> 0b 4c 89 ea 48 89 ee 48 c7 c7 c0 d2 cc 87 e8 63 f8 23 fe 0f 
[   38.617126] RIP: __list_del_entry_valid.cold+0xf/0x55 RSP: ffff8880b297fb30
[   38.624480] ---[ end trace 3584cc6ac8feaf23 ]---
[   38.629242] Kernel panic - not syncing: Fatal exception
[   38.635127] Kernel Offset: disabled
[   38.638732] Rebooting in 86400 seconds..