[ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.29' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 62.993490][ T7072] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 63.043724][ T7072] ------------[ cut here ]------------ [ 63.049335][ T7072] WARNING: CPU: 0 PID: 7072 at fs/inode.c:360 inc_nlink+0x144/0x160 [ 63.057311][ T7072] Kernel panic - not syncing: panic_on_warn set ... [ 63.063905][ T7072] CPU: 0 PID: 7072 Comm: syz-executor476 Not tainted 5.7.0-rc1-next-20200415-syzkaller #0 [ 63.073784][ T7072] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.083821][ T7072] Call Trace: [ 63.087104][ T7072] dump_stack+0x188/0x20d [ 63.091432][ T7072] ? inc_nlink+0x140/0x160 [ 63.095856][ T7072] panic+0x2e3/0x75c [ 63.099761][ T7072] ? add_taint.cold+0x16/0x16 [ 63.104443][ T7072] ? printk+0xba/0xed [ 63.108455][ T7072] ? kmsg_dump_rewind_nolock+0xd9/0xd9 [ 63.113906][ T7072] ? __warn.cold+0x14/0x35 [ 63.118418][ T7072] ? __warn+0xd5/0x1c8 [ 63.122494][ T7072] ? inc_nlink+0x144/0x160 [ 63.126897][ T7072] __warn.cold+0x2f/0x35 [ 63.131140][ T7072] ? inc_nlink+0x144/0x160 [ 63.135551][ T7072] report_bug+0x27b/0x2f0 [ 63.139869][ T7072] do_error_trap+0x12b/0x220 [ 63.144452][ T7072] ? inc_nlink+0x144/0x160 [ 63.148856][ T7072] do_invalid_op+0x32/0x40 [ 63.153276][ T7072] ? inc_nlink+0x144/0x160 [ 63.157678][ T7072] invalid_op+0x23/0x30 [ 63.161817][ T7072] RIP: 0010:inc_nlink+0x144/0x160 [ 63.166827][ T7072] Code: ff 4c 89 e7 e8 dd a8 ee ff e9 42 ff ff ff 4c 89 e7 e8 60 a8 ee ff e9 fc fe ff ff 4c 89 e7 e8 53 a8 ee ff eb d4 e8 8c 87 b0 ff <0f> 0b e9 6e ff ff ff e8 50 a8 ee ff e9 44 ff ff ff e8 46 a8 ee ff [ 63.186426][ T7072] RSP: 0018:ffffc900010b7d88 EFLAGS: 00010293 [ 63.192476][ T7072] RAX: ffff888094cb84c0 RBX: ffff888088368a00 RCX: ffffffff81c2ac70 [ 63.200443][ T7072] RDX: 0000000000000000 RSI: ffffffff81c2ad04 RDI: 0000000000000007 [ 63.208406][ T7072] RBP: 0000000000000000 R08: ffff888094cb84c0 R09: ffffed1015440757 [ 63.216370][ T7072] R10: ffff8880aa203ab3 R11: ffffed1015440756 R12: ffff888088368a48 [ 63.224337][ T7072] R13: ffff88808f4f7000 R14: ffff88808f4f7060 R15: 0000000000000000 [ 63.232317][ T7072] ? inc_nlink+0xb0/0x160 [ 63.236626][ T7072] ? inc_nlink+0x144/0x160 [ 63.241025][ T7072] ? inc_nlink+0x144/0x160 [ 63.245435][ T7072] minix_mkdir+0x71/0x1b0 [ 63.249749][ T7072] ? minix_create+0x30/0x30 [ 63.254246][ T7072] ? generic_permission+0x116/0x520 [ 63.259425][ T7072] ? security_inode_permission+0xc4/0xf0 [ 63.265042][ T7072] ? security_inode_mkdir+0xd9/0x110 [ 63.270328][ T7072] vfs_mkdir+0x419/0x690 [ 63.274557][ T7072] do_mkdirat+0x21e/0x280 [ 63.278877][ T7072] ? __ia32_sys_mknod+0xb0/0xb0 [ 63.283705][ T7072] ? filp_close+0x12f/0x170 [ 63.288206][ T7072] ? trace_hardirqs_off_caller+0x55/0x230 [ 63.293921][ T7072] do_syscall_64+0xf6/0x7d0 [ 63.298477][ T7072] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 63.304360][ T7072] RIP: 0033:0x444a69 [ 63.308241][ T7072] 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 [ 63.327853][ T7072] RSP: 002b:00007fffa7e02e28 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 [ 63.336264][ T7072] RAX: ffffffffffffffda RBX: 00007fffa7e02e30 RCX: 0000000000444a69 [ 63.344218][ T7072] RDX: 0000000000000100 RSI: 0000000020000300 RDI: 0000000000000003 [ 63.352171][ T7072] RBP: 0000000000000000 R08: 0000000000400e50 R09: 0000000000400e50 [ 63.360188][ T7072] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004026d0 [ 63.368177][ T7072] R13: 0000000000402760 R14: 0000000000000000 R15: 0000000000000000 [ 63.377594][ T7072] Kernel Offset: disabled [ 63.381972][ T7072] Rebooting in 86400 seconds..