[ OK ] Started Daily Cleanup of Temporary Directories. [ OK ] Reached target Timers. Starting System Logging Service... [ OK ] Started Regular background program processing daemon. Starting Permit User Sessions... [ OK ] Started System Logging Service. [ OK ] Found device /dev/ttyS0. [ OK ] Started Permit User Sessions. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. [ 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 Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ 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 '10.128.10.60' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 69.872128][ T7052] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 69.888365][ T7052] ------------[ cut here ]------------ [ 69.894035][ T7052] WARNING: CPU: 0 PID: 7052 at fs/inode.c:360 inc_nlink+0x144/0x160 [ 69.902044][ T7052] Kernel panic - not syncing: panic_on_warn set ... [ 69.908641][ T7052] CPU: 0 PID: 7052 Comm: syz-executor390 Not tainted 5.7.0-rc1-syzkaller #0 [ 69.917581][ T7052] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.927830][ T7052] Call Trace: [ 69.931112][ T7052] dump_stack+0x188/0x20d [ 69.935433][ T7052] ? inc_nlink+0xb0/0x160 [ 69.939759][ T7052] panic+0x2e3/0x75c [ 69.943633][ T7052] ? add_taint.cold+0x16/0x16 [ 69.948291][ T7052] ? printk+0xba/0xed [ 69.952252][ T7052] ? kmsg_dump_rewind_nolock+0xd9/0xd9 [ 69.957708][ T7052] ? __warn.cold+0x14/0x35 [ 69.962133][ T7052] ? __warn+0xd5/0x1c8 [ 69.966214][ T7052] ? inc_nlink+0x144/0x160 [ 69.970635][ T7052] __warn.cold+0x2f/0x35 [ 69.974884][ T7052] ? inc_nlink+0x144/0x160 [ 69.979312][ T7052] report_bug+0x27b/0x2f0 [ 69.983655][ T7052] do_error_trap+0x12b/0x220 [ 69.988408][ T7052] ? inc_nlink+0x144/0x160 [ 69.992819][ T7052] do_invalid_op+0x32/0x40 [ 69.997218][ T7052] ? inc_nlink+0x144/0x160 [ 70.001675][ T7052] invalid_op+0x23/0x30 [ 70.006071][ T7052] RIP: 0010:inc_nlink+0x144/0x160 [ 70.011075][ T7052] 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 6c 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 [ 70.030857][ T7052] RSP: 0018:ffffc90001857d88 EFLAGS: 00010293 [ 70.037015][ T7052] RAX: ffff8880a1b2c600 RBX: ffff888084650a00 RCX: ffffffff81c28b00 [ 70.045191][ T7052] RDX: 0000000000000000 RSI: ffffffff81c28b94 RDI: 0000000000000007 [ 70.053629][ T7052] RBP: 0000000000000000 R08: ffff8880a1b2c600 R09: fffffbfff15128b9 [ 70.061595][ T7052] R10: ffffffff8a8945c7 R11: fffffbfff15128b8 R12: ffff888084650a48 [ 70.069559][ T7052] R13: ffff888089399730 R14: ffff888089399790 R15: 0000000000000000 [ 70.077535][ T7052] ? inc_nlink+0xb0/0x160 [ 70.081842][ T7052] ? inc_nlink+0x144/0x160 [ 70.086259][ T7052] ? inc_nlink+0x144/0x160 [ 70.090662][ T7052] minix_mkdir+0x71/0x1b0 [ 70.094982][ T7052] ? minix_create+0x30/0x30 [ 70.099467][ T7052] ? security_inode_mkdir+0xd9/0x110 [ 70.104763][ T7052] vfs_mkdir+0x419/0x690 [ 70.109012][ T7052] do_mkdirat+0x21e/0x280 [ 70.113495][ T7052] ? __ia32_sys_mknod+0xb0/0xb0 [ 70.118339][ T7052] ? trace_hardirqs_off_caller+0x55/0x230 [ 70.124065][ T7052] do_syscall_64+0xf6/0x7d0 [ 70.128659][ T7052] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 70.134549][ T7052] RIP: 0033:0x444a69 [ 70.138429][ T7052] 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 [ 70.158022][ T7052] RSP: 002b:00007ffd127ca718 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 [ 70.166430][ T7052] RAX: ffffffffffffffda RBX: 00007ffd127ca720 RCX: 0000000000444a69 [ 70.174424][ T7052] RDX: 0000000000000050 RSI: 0000000020000040 RDI: 0000000000000003 [ 70.182740][ T7052] RBP: 0000000000000000 R08: 0000000000400e50 R09: 0000000000400e50 [ 70.190709][ T7052] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004026d0 [ 70.198683][ T7052] R13: 0000000000402760 R14: 0000000000000000 R15: 0000000000000000 [ 70.208390][ T7052] Kernel Offset: disabled [ 70.212778][ T7052] Rebooting in 86400 seconds..