[ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ OK ] Started Getty on tty6. [ OK ] Started Getty on tty5. [ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.56' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 68.030913][ T7040] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 68.056482][ T7040] ------------[ cut here ]------------ [ 68.062141][ T7040] WARNING: CPU: 0 PID: 7040 at fs/inode.c:360 inc_nlink+0x144/0x160 [ 68.070306][ T7040] Kernel panic - not syncing: panic_on_warn set ... [ 68.076919][ T7040] CPU: 0 PID: 7040 Comm: syz-executor357 Not tainted 5.7.0-rc1-syzkaller #0 [ 68.085596][ T7040] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 68.095778][ T7040] Call Trace: [ 68.099066][ T7040] dump_stack+0x188/0x20d [ 68.103392][ T7040] ? inc_nlink+0xc0/0x160 [ 68.107721][ T7040] panic+0x2e3/0x75c [ 68.111659][ T7040] ? add_taint.cold+0x16/0x16 [ 68.116341][ T7040] ? printk+0xba/0xed [ 68.120325][ T7040] ? kmsg_dump_rewind_nolock+0xd9/0xd9 [ 68.125780][ T7040] ? __warn.cold+0x14/0x35 [ 68.130321][ T7040] ? __warn+0xd5/0x1c8 [ 68.134397][ T7040] ? inc_nlink+0x144/0x160 [ 68.138831][ T7040] __warn.cold+0x2f/0x35 [ 68.143216][ T7040] ? inc_nlink+0x144/0x160 [ 68.147870][ T7040] report_bug+0x27b/0x2f0 [ 68.152209][ T7040] do_error_trap+0x12b/0x220 [ 68.156970][ T7040] ? inc_nlink+0x144/0x160 [ 68.161415][ T7040] do_invalid_op+0x32/0x40 [ 68.165846][ T7040] ? inc_nlink+0x144/0x160 [ 68.170276][ T7040] invalid_op+0x23/0x30 [ 68.174501][ T7040] RIP: 0010:inc_nlink+0x144/0x160 [ 68.179696][ T7040] Code: ff 4c 89 e7 e8 ed 6f ee ff e9 42 ff ff ff 4c 89 e7 e8 70 6f ee ff e9 fc fe ff ff 4c 89 e7 e8 63 6f ee ff eb d4 e8 7c a8 b0 ff <0f> 0b e9 6e ff ff ff e8 60 6f ee ff e9 44 ff ff ff e8 56 6f ee ff [ 68.199918][ T7040] RSP: 0018:ffffc90001477d88 EFLAGS: 00010293 [ 68.206000][ T7040] RAX: ffff88808eca6180 RBX: ffff888084a0ba00 RCX: ffffffff81c28af0 [ 68.213985][ T7040] RDX: 0000000000000000 RSI: ffffffff81c28b84 RDI: 0000000000000007 [ 68.221946][ T7040] RBP: 0000000000000000 R08: ffff88808eca6180 R09: fffffbfff15128a9 [ 68.229916][ T7040] R10: ffffffff8a894547 R11: fffffbfff15128a8 R12: ffff888084a0ba48 [ 68.237886][ T7040] R13: ffff8880890dd170 R14: ffff8880890dd1d0 R15: 0000000000000000 [ 68.245874][ T7040] ? inc_nlink+0xb0/0x160 [ 68.250286][ T7040] ? inc_nlink+0x144/0x160 [ 68.254702][ T7040] ? inc_nlink+0x144/0x160 [ 68.259183][ T7040] minix_mkdir+0x71/0x1b0 [ 68.263571][ T7040] ? minix_create+0x30/0x30 [ 68.268072][ T7040] ? security_inode_mkdir+0xd9/0x110 [ 68.273361][ T7040] vfs_mkdir+0x419/0x690 [ 68.277596][ T7040] do_mkdirat+0x21e/0x280 [ 68.281930][ T7040] ? __ia32_sys_mknod+0xb0/0xb0 [ 68.286817][ T7040] ? filp_close+0x12f/0x170 [ 68.291419][ T7040] ? trace_hardirqs_off_caller+0x55/0x230 [ 68.297143][ T7040] do_syscall_64+0xf6/0x7d0 [ 68.301669][ T7040] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 68.307552][ T7040] RIP: 0033:0x4449f9 [ 68.311444][ T7040] 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 [ 68.331032][ T7040] RSP: 002b:00007fff341eca28 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 [ 68.339429][ T7040] RAX: ffffffffffffffda RBX: 00007fff341eca30 RCX: 00000000004449f9 [ 68.347407][ T7040] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 0000000020000400 [ 68.355368][ T7040] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000400de0 [ 68.363331][ T7040] R10: 00007fff341ec900 R11: 0000000000000246 R12: 0000000000402660 [ 68.371281][ T7040] R13: 00000000004026f0 R14: 0000000000000000 R15: 0000000000000000 [ 68.380829][ T7040] Kernel Offset: disabled [ 68.385239][ T7040] Rebooting in 86400 seconds..