[  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: [   30.181443][ T6839] bash (6839) used greatest stack depth: 24640 bytes left
Warning: Permanently added '10.128.0.125' (ECDSA) to the list of known hosts.
executing program
[   48.969527][ T6994] MINIX-fs: mounting unchecked file system, running fsck is recommended
[   48.980194][ T6994] ------------[ cut here ]------------
[   48.985785][ T6994] WARNING: CPU: 1 PID: 6994 at fs/inode.c:360 inc_nlink+0x11e/0x130
[   48.993769][ T6994] Kernel panic - not syncing: panic_on_warn set ...
[   49.000466][ T6994] CPU: 1 PID: 6994 Comm: syz-executor292 Not tainted 5.7.0-rc2-syzkaller #0
[   49.009262][ T6994] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   49.019417][ T6994] Call Trace:
[   49.022694][ T6994]  dump_stack+0x1e9/0x30e
[   49.027026][ T6994]  panic+0x264/0x7a0
[   49.031141][ T6994]  ? __warn+0x102/0x210
[   49.035473][ T6994]  ? inc_nlink+0x11e/0x130
[   49.039876][ T6994]  __warn+0x209/0x210
[   49.043849][ T6994]  ? inc_nlink+0x11e/0x130
[   49.048313][ T6994]  report_bug+0x1ac/0x2d0
[   49.052629][ T6994]  do_error_trap+0xca/0x1c0
[   49.057116][ T6994]  do_invalid_op+0x32/0x40
[   49.061513][ T6994]  ? inc_nlink+0x11e/0x130
[   49.065966][ T6994]  invalid_op+0x23/0x30
[   49.070106][ T6994] RIP: 0010:inc_nlink+0x11e/0x130
[   49.075110][ T6994] Code: ef ff e9 38 ff ff ff 44 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c 49 ff ff ff 4c 89 ef e8 7c 93 ef ff e9 3c ff ff ff e8 72 b5 b1 ff <0f> 0b eb 80 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 41 57 41 56
[   49.095300][ T6994] RSP: 0018:ffffc900014a7dc0 EFLAGS: 00010293
[   49.101356][ T6994] RAX: ffffffff81c1ac1e RBX: 1ffff11011cafd49 RCX: ffff8880a7486140
[   49.109411][ T6994] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[   49.117464][ T6994] RBP: 0000000000000000 R08: ffffffff81c1ab98 R09: ffffc900014a7db0
[   49.125708][ T6994] R10: fffff52000294fba R11: 0000000000000000 R12: dffffc0000000000
[   49.133751][ T6994] R13: ffff88808e57ea48 R14: ffff88808e57ea00 R15: 0000000000000000
[   49.141719][ T6994]  ? inc_nlink+0x98/0x130
[   49.146032][ T6994]  ? inc_nlink+0x11e/0x130
[   49.150605][ T6994]  minix_mkdir+0x3b/0x200
[   49.154946][ T6994]  ? security_inode_mkdir+0xcf/0x120
[   49.160364][ T6994]  vfs_mkdir+0x42a/0x620
[   49.164730][ T6994]  do_mkdirat+0x1b9/0x310
[   49.169057][ T6994]  do_syscall_64+0xf3/0x1b0
[   49.173999][ T6994]  entry_SYSCALL_64_after_hwframe+0x49/0xb3
[   49.179988][ T6994] RIP: 0033:0x444ac9
[   49.183868][ T6994] Code: 0d d8 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 db d7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
[   49.203584][ T6994] RSP: 002b:00007fff41d96558 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
[   49.212250][ T6994] RAX: ffffffffffffffda RBX: 00007fff41d96560 RCX: 0000000000444ac9
[   49.220735][ T6994] RDX: 00000000000001ff RSI: 0000000020000080 RDI: 0000000000000003
[   49.228758][ T6994] RBP: 0000000000000000 R08: 0000000000400eb0 R09: 0000000000400eb0
[   49.236790][ T6994] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402730
[   49.244747][ T6994] R13: 00000000004027c0 R14: 0000000000000000 R15: 0000000000000000
[   49.254290][ T6994] Kernel Offset: disabled
[   49.258676][ T6994] Rebooting in 86400 seconds..