[ 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. Starting Load/Save RF Kill Switch Status... Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.126' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 63.461571][ T7150] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 63.472844][ T7150] ------------[ cut here ]------------ [ 63.478517][ T7150] WARNING: CPU: 0 PID: 7150 at fs/inode.c:360 inc_nlink+0x144/0x160 [ 63.486499][ T7150] Kernel panic - not syncing: panic_on_warn set ... [ 63.493098][ T7150] CPU: 0 PID: 7150 Comm: syz-executor563 Not tainted 5.7.0-rc1-next-20200415-syzkaller #0 [ 63.503077][ T7150] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.513138][ T7150] Call Trace: [ 63.516448][ T7150] dump_stack+0x188/0x20d [ 63.520791][ T7150] ? inc_nlink+0x140/0x160 [ 63.525227][ T7150] panic+0x2e3/0x75c [ 63.529138][ T7150] ? add_taint.cold+0x16/0x16 [ 63.533815][ T7150] ? printk+0xba/0xed [ 63.537952][ T7150] ? kmsg_dump_rewind_nolock+0xd9/0xd9 [ 63.543423][ T7150] ? __warn.cold+0x14/0x35 [ 63.547915][ T7150] ? __warn+0xd5/0x1c8 [ 63.551968][ T7150] ? inc_nlink+0x144/0x160 [ 63.556367][ T7150] __warn.cold+0x2f/0x35 [ 63.560609][ T7150] ? inc_nlink+0x144/0x160 [ 63.565120][ T7150] report_bug+0x27b/0x2f0 [ 63.569443][ T7150] do_error_trap+0x12b/0x220 [ 63.574032][ T7150] ? inc_nlink+0x144/0x160 [ 63.578440][ T7150] do_invalid_op+0x32/0x40 [ 63.582850][ T7150] ? inc_nlink+0x144/0x160 [ 63.587262][ T7150] invalid_op+0x23/0x30 [ 63.591420][ T7150] RIP: 0010:inc_nlink+0x144/0x160 [ 63.596434][ T7150] 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 [ 63.616135][ T7150] RSP: 0018:ffffc90002177d88 EFLAGS: 00010293 [ 63.622190][ T7150] RAX: ffff888094458400 RBX: ffff88808631aa00 RCX: ffffffff81c2ac70 [ 63.630145][ T7150] RDX: 0000000000000000 RSI: ffffffff81c2ad04 RDI: 0000000000000007 [ 63.638098][ T7150] RBP: 0000000000000000 R08: ffff888094458400 R09: ffffed1015440757 [ 63.646054][ T7150] R10: ffff8880aa203ab3 R11: ffffed1015440756 R12: ffff88808631aa48 [ 63.654008][ T7150] R13: ffff8880894d78a0 R14: ffff8880894d7900 R15: 0000000000000000 [ 63.661984][ T7150] ? inc_nlink+0xb0/0x160 [ 63.666309][ T7150] ? inc_nlink+0x144/0x160 [ 63.670726][ T7150] ? inc_nlink+0x144/0x160 [ 63.675534][ T7150] minix_mkdir+0x71/0x1b0 [ 63.679864][ T7150] ? minix_create+0x30/0x30 [ 63.684398][ T7150] ? generic_permission+0x116/0x520 [ 63.689632][ T7150] ? security_inode_permission+0xc4/0xf0 [ 63.695252][ T7150] ? security_inode_mkdir+0xd9/0x110 [ 63.700526][ T7150] vfs_mkdir+0x419/0x690 [ 63.704770][ T7150] do_mkdirat+0x21e/0x280 [ 63.709132][ T7150] ? __ia32_sys_mknod+0xb0/0xb0 [ 63.713963][ T7150] ? filp_close+0x12f/0x170 [ 63.718448][ T7150] ? trace_hardirqs_off_caller+0x55/0x230 [ 63.724197][ T7150] do_syscall_64+0xf6/0x7d0 [ 63.728687][ T7150] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 63.734604][ T7150] RIP: 0033:0x444a59 [ 63.738486][ T7150] 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 [ 63.758073][ T7150] RSP: 002b:00007fff3434ecc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 [ 63.766477][ T7150] RAX: ffffffffffffffda RBX: 00007fff3434ecd0 RCX: 0000000000444a59 [ 63.774446][ T7150] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 0000000020000400 [ 63.782626][ T7150] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000400e40 [ 63.790596][ T7150] R10: 00007fff3434eba0 R11: 0000000000000246 R12: 00000000004026c0 [ 63.798559][ T7150] R13: 0000000000402750 R14: 0000000000000000 R15: 0000000000000000 [ 63.808114][ T7150] Kernel Offset: disabled [ 63.812502][ T7150] Rebooting in 86400 seconds..