[ 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 Warning: Permanently added '10.128.15.200' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 69.747893][ T7086] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 69.784868][ T7086] ------------[ cut here ]------------ [ 69.790573][ T7086] WARNING: CPU: 0 PID: 7086 at fs/inode.c:360 inc_nlink+0x144/0x160 [ 69.798724][ T7086] Kernel panic - not syncing: panic_on_warn set ... [ 69.805377][ T7086] CPU: 0 PID: 7086 Comm: syz-executor015 Not tainted 5.7.0-rc1-next-20200415-syzkaller #0 [ 69.815615][ T7086] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.825682][ T7086] Call Trace: [ 69.828989][ T7086] dump_stack+0x188/0x20d [ 69.833333][ T7086] ? inc_nlink+0x140/0x160 [ 69.837758][ T7086] panic+0x2e3/0x75c [ 69.841661][ T7086] ? add_taint.cold+0x16/0x16 [ 69.846437][ T7086] ? printk+0xba/0xed [ 69.850597][ T7086] ? kmsg_dump_rewind_nolock+0xd9/0xd9 [ 69.856071][ T7086] ? __warn.cold+0x14/0x35 [ 69.861186][ T7086] ? __warn+0xd5/0x1c8 [ 69.865301][ T7086] ? inc_nlink+0x144/0x160 [ 69.869730][ T7086] __warn.cold+0x2f/0x35 [ 69.874023][ T7086] ? inc_nlink+0x144/0x160 [ 69.878445][ T7086] report_bug+0x27b/0x2f0 [ 69.883574][ T7086] do_error_trap+0x12b/0x220 [ 69.888166][ T7086] ? inc_nlink+0x144/0x160 [ 69.892613][ T7086] do_invalid_op+0x32/0x40 [ 69.897038][ T7086] ? inc_nlink+0x144/0x160 [ 69.901471][ T7086] invalid_op+0x23/0x30 [ 69.905629][ T7086] RIP: 0010:inc_nlink+0x144/0x160 [ 69.910738][ T7086] 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 [ 69.930351][ T7086] RSP: 0018:ffffc90005277d88 EFLAGS: 00010293 [ 69.936462][ T7086] RAX: ffff8880948c0040 RBX: ffff888086acca00 RCX: ffffffff81c2ac70 [ 69.944571][ T7086] RDX: 0000000000000000 RSI: ffffffff81c2ad04 RDI: 0000000000000007 [ 69.952535][ T7086] RBP: 0000000000000000 R08: ffff8880948c0040 R09: ffffed1015440757 [ 69.960494][ T7086] R10: ffff8880aa203ab3 R11: ffffed1015440756 R12: ffff888086acca48 [ 69.968647][ T7086] R13: ffff88808abf3e60 R14: ffff88808abf3ec0 R15: 0000000000000000 [ 69.976622][ T7086] ? inc_nlink+0xb0/0x160 [ 69.980940][ T7086] ? inc_nlink+0x144/0x160 [ 69.985339][ T7086] ? inc_nlink+0x144/0x160 [ 69.989739][ T7086] minix_mkdir+0x71/0x1b0 [ 69.994051][ T7086] ? minix_create+0x30/0x30 [ 69.998577][ T7086] ? generic_permission+0x116/0x520 [ 70.003781][ T7086] ? security_inode_permission+0xc4/0xf0 [ 70.009433][ T7086] ? security_inode_mkdir+0xd9/0x110 [ 70.014706][ T7086] vfs_mkdir+0x419/0x690 [ 70.018937][ T7086] do_mkdirat+0x21e/0x280 [ 70.023247][ T7086] ? __ia32_sys_mknod+0xb0/0xb0 [ 70.028082][ T7086] ? filp_close+0x12f/0x170 [ 70.032566][ T7086] ? trace_hardirqs_off_caller+0x55/0x230 [ 70.038268][ T7086] do_syscall_64+0xf6/0x7d0 [ 70.042767][ T7086] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 70.048652][ T7086] RIP: 0033:0x444a59 [ 70.052545][ T7086] 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 [ 70.072237][ T7086] RSP: 002b:00007fff707b4e68 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 [ 70.080663][ T7086] RAX: ffffffffffffffda RBX: 00007fff707b4e70 RCX: 0000000000444a59 [ 70.088623][ T7086] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000240 [ 70.100668][ T7086] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000400e40 [ 70.108625][ T7086] R10: 00007fff707b4d40 R11: 0000000000000246 R12: 00000000004026c0 [ 70.116589][ T7086] R13: 0000000000402750 R14: 0000000000000000 R15: 0000000000000000 [ 70.126266][ T7086] Kernel Offset: disabled [ 70.130697][ T7086] Rebooting in 86400 seconds..