[ 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... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.42' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 68.114735][ T7113] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 68.137950][ T7113] ------------[ cut here ]------------ [ 68.143625][ T7113] WARNING: CPU: 0 PID: 7113 at fs/inode.c:360 inc_nlink+0x144/0x160 [ 68.151608][ T7113] Kernel panic - not syncing: panic_on_warn set ... [ 68.158317][ T7113] CPU: 0 PID: 7113 Comm: syz-executor493 Not tainted 5.7.0-rc1-next-20200415-syzkaller #0 [ 68.168201][ T7113] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 68.178237][ T7113] Call Trace: [ 68.181535][ T7113] dump_stack+0x188/0x20d [ 68.185881][ T7113] ? inc_nlink+0x140/0x160 [ 68.190316][ T7113] panic+0x2e3/0x75c [ 68.194227][ T7113] ? add_taint.cold+0x16/0x16 [ 68.198929][ T7113] ? printk+0xba/0xed [ 68.202921][ T7113] ? kmsg_dump_rewind_nolock+0xd9/0xd9 [ 68.208408][ T7113] ? __warn.cold+0x14/0x35 [ 68.212812][ T7113] ? __warn+0xd5/0x1c8 [ 68.216859][ T7113] ? inc_nlink+0x144/0x160 [ 68.221250][ T7113] __warn.cold+0x2f/0x35 [ 68.225470][ T7113] ? inc_nlink+0x144/0x160 [ 68.229881][ T7113] report_bug+0x27b/0x2f0 [ 68.234203][ T7113] do_error_trap+0x12b/0x220 [ 68.238777][ T7113] ? inc_nlink+0x144/0x160 [ 68.243302][ T7113] do_invalid_op+0x32/0x40 [ 68.247729][ T7113] ? inc_nlink+0x144/0x160 [ 68.252130][ T7113] invalid_op+0x23/0x30 [ 68.256288][ T7113] RIP: 0010:inc_nlink+0x144/0x160 [ 68.261312][ T7113] 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 [ 68.280990][ T7113] RSP: 0018:ffffc900050c7d88 EFLAGS: 00010293 [ 68.287034][ T7113] RAX: ffff88808927c580 RBX: ffff88808670ca00 RCX: ffffffff81c2ac70 [ 68.294982][ T7113] RDX: 0000000000000000 RSI: ffffffff81c2ad04 RDI: 0000000000000007 [ 68.302941][ T7113] RBP: 0000000000000000 R08: ffff88808927c580 R09: ffffed1015440757 [ 68.310898][ T7113] R10: ffff8880aa203ab3 R11: ffffed1015440756 R12: ffff88808670ca48 [ 68.318859][ T7113] R13: ffff888089a1f730 R14: ffff888089a1f790 R15: 0000000000000000 [ 68.326840][ T7113] ? inc_nlink+0xb0/0x160 [ 68.331158][ T7113] ? inc_nlink+0x144/0x160 [ 68.335556][ T7113] ? inc_nlink+0x144/0x160 [ 68.339953][ T7113] minix_mkdir+0x71/0x1b0 [ 68.344263][ T7113] ? minix_create+0x30/0x30 [ 68.348745][ T7113] ? generic_permission+0x116/0x520 [ 68.353957][ T7113] ? security_inode_permission+0xc4/0xf0 [ 68.359681][ T7113] ? security_inode_mkdir+0xd9/0x110 [ 68.365270][ T7113] vfs_mkdir+0x419/0x690 [ 68.369541][ T7113] do_mkdirat+0x21e/0x280 [ 68.373879][ T7113] ? __ia32_sys_mknod+0xb0/0xb0 [ 68.378715][ T7113] ? filp_close+0x12f/0x170 [ 68.383212][ T7113] ? trace_hardirqs_off_caller+0x55/0x230 [ 68.388927][ T7113] do_syscall_64+0xf6/0x7d0 [ 68.393431][ T7113] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 68.399302][ T7113] RIP: 0033:0x444ac9 [ 68.403173][ T7113] 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 [ 68.423028][ T7113] RSP: 002b:00007ffe0a43bf28 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 [ 68.431432][ T7113] RAX: ffffffffffffffda RBX: 00007ffe0a43bf30 RCX: 0000000000444ac9 [ 68.439380][ T7113] RDX: 00000000000001ff RSI: 0000000020000080 RDI: 0000000000000003 [ 68.447332][ T7113] RBP: 0000000000000000 R08: 0000000000400eb0 R09: 0000000000400eb0 [ 68.455280][ T7113] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402730 [ 68.463243][ T7113] R13: 00000000004027c0 R14: 0000000000000000 R15: 0000000000000000 [ 68.472701][ T7113] Kernel Offset: disabled [ 68.477112][ T7113] Rebooting in 86400 seconds..