[  OK  ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
[  OK  ] Started Update UTMP about System Runlevel Changes.
         Starting Load/Save RF Kill Switch Status...
[  OK  ] Started Load/Save RF Kill Switch Status.

Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.1.54' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   40.789244] VFS: Found a V7 FS (block size = 512) on device loop0
[   40.796968] ------------[ cut here ]------------
[   40.804499] WARNING: CPU: 1 PID: 8114 at fs/inode.c:343 inc_nlink.cold+0x11/0x18
[   40.812044] Kernel panic - not syncing: panic_on_warn set ...
[   40.812044] 
[   40.819398] CPU: 1 PID: 8114 Comm: syz-executor923 Not tainted 4.19.154-syzkaller #0
[   40.827286] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   40.836625] Call Trace:
[   40.839202]  dump_stack+0x1fc/0x2fe
[   40.842813]  panic+0x26a/0x50e
[   40.845995]  ? __warn_printk+0xf3/0xf3
[   40.849864]  ? inc_nlink.cold+0x11/0x18
[   40.853823]  ? __probe_kernel_read+0x130/0x1b0
[   40.858404]  ? __warn.cold+0x5/0x61
[   40.862009]  ? __warn+0xe4/0x200
[   40.865356]  ? inc_nlink.cold+0x11/0x18
[   40.869324]  __warn.cold+0x20/0x61
[   40.872860]  ? inc_nlink.cold+0x11/0x18
[   40.876838]  report_bug+0x262/0x2b0
[   40.880472]  do_error_trap+0x1d7/0x310
[   40.884380]  ? math_error+0x310/0x310
[   40.888171]  ? __irq_work_queue_local+0x101/0x160
[   40.892996]  ? irq_work_queue+0x29/0x80
[   40.896950]  ? error_entry+0x72/0xd0
[   40.900651]  ? trace_hardirqs_off_caller+0x6e/0x210
[   40.905793]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   40.910624]  invalid_op+0x14/0x20
[   40.914067] RIP: 0010:inc_nlink.cold+0x11/0x18
[   40.918660] Code: c0 74 04 3c 03 7e 08 8b 5d 48 e9 65 7e ff ff 4c 89 e7 e8 18 96 ee ff eb ee e8 51 6d b8 ff 48 c7 c7 80 a6 74 88 e8 54 67 a3 ff <0f> 0b e9 a7 7f ff ff e8 39 6d b8 ff 48 8d 7b 40 b8 ff ff 37 00 48
[   40.937726] RSP: 0018:ffff8880b139fdf0 EFLAGS: 00010282
[   40.943081] RAX: 0000000000000024 RBX: ffff88808b01c948 RCX: 0000000000000000
[   40.950415] RDX: 0000000000000000 RSI: ffffffff814fdb21 RDI: ffffed1016273fb0
[   40.957765] RBP: 0000000000000000 R08: 0000000000000024 R09: 0000000000000000
[   40.965030] R10: 0000000000000005 R11: 0000000000000000 R12: ffff88808b01c990
[   40.972279] R13: ffff88808e61a9e0 R14: 000000000000007e R15: 0000000000000021
[   40.979545]  ? vprintk_func+0x81/0x17e
[   40.983424]  sysv_mkdir+0x21/0x150
[   40.986946]  vfs_mkdir+0x508/0x7a0
[   40.990477]  do_mkdirat+0x262/0x2d0
[   40.994098]  ? __ia32_sys_mknod+0x120/0x120
[   40.998418]  ? trace_hardirqs_off_caller+0x6e/0x210
[   41.003424]  ? do_syscall_64+0x21/0x620
[   41.007384]  do_syscall_64+0xf9/0x620
[   41.011178]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   41.016359] RIP: 0033:0x444439
[   41.019534] Code: 8d d7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 5b d7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
[   41.038422] RSP: 002b:00007ffc0983ab18 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
[   41.046113] RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000444439
[   41.053465] RDX: 0000000000400fe0 RSI: 0000000000000023 RDI: 0000000020000080
[   41.060714] RBP: 00000000006cf018 R08: 00007ffc00000015 R09: 0000000000000000
[   41.067976] R10: 00007ffc0983a9d0 R11: 0000000000000246 R12: 0000000000402020
[   41.075233] R13: 00000000004020b0 R14: 0000000000000000 R15: 0000000000000000
[   41.083394] Kernel Offset: disabled
[   41.087080] Rebooting in 86400 seconds..