[ 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 '10.128.0.2' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 42.867330][ T7099] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 42.887265][ T7099] ------------[ cut here ]------------ [ 42.892858][ T7099] WARNING: CPU: 0 PID: 7099 at fs/inode.c:360 inc_nlink+0x11e/0x130 [ 42.900839][ T7099] Kernel panic - not syncing: panic_on_warn set ... [ 42.907433][ T7099] CPU: 0 PID: 7099 Comm: syz-executor172 Not tainted 5.7.0-rc1-syzkaller #0 [ 42.916104][ T7099] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.926161][ T7099] Call Trace: [ 42.929462][ T7099] dump_stack+0x1e9/0x30e [ 42.933932][ T7099] panic+0x264/0x7a0 [ 42.937831][ T7099] ? __warn+0x102/0x210 [ 42.941996][ T7099] ? inc_nlink+0x11e/0x130 [ 42.946419][ T7099] __warn+0x209/0x210 [ 42.950428][ T7099] ? inc_nlink+0x11e/0x130 [ 42.955199][ T7099] report_bug+0x1ac/0x2d0 [ 42.959517][ T7099] do_error_trap+0xca/0x1c0 [ 42.964019][ T7099] do_invalid_op+0x32/0x40 [ 42.968430][ T7099] ? inc_nlink+0x11e/0x130 [ 42.973720][ T7099] invalid_op+0x23/0x30 [ 42.977863][ T7099] RIP: 0010:inc_nlink+0x11e/0x130 [ 42.982874][ T7099] Code: ef ff e9 38 ff ff ff 44 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c 49 ff ff ff 4c 89 ef e8 7c 93 ef ff e9 3c ff ff ff e8 72 b5 b1 ff <0f> 0b eb 80 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 41 57 41 56 [ 43.002559][ T7099] RSP: 0018:ffffc90001627dc0 EFLAGS: 00010293 [ 43.008605][ T7099] RAX: ffffffff81c1ad5e RBX: 1ffff11010bdff49 RCX: ffff88808fc52400 [ 43.016559][ T7099] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 43.024645][ T7099] RBP: 0000000000000000 R08: ffffffff81c1acd8 R09: ffffc90001627db0 [ 43.032601][ T7099] R10: fffff520002c4fba R11: 0000000000000000 R12: dffffc0000000000 [ 43.040696][ T7099] R13: ffff888085effa48 R14: ffff888085effa00 R15: 0000000000000000 [ 43.048827][ T7099] ? inc_nlink+0x98/0x130 [ 43.053147][ T7099] ? inc_nlink+0x11e/0x130 [ 43.057653][ T7099] minix_mkdir+0x3b/0x200 [ 43.062024][ T7099] ? security_inode_mkdir+0xcf/0x120 [ 43.067343][ T7099] vfs_mkdir+0x42a/0x620 [ 43.071590][ T7099] do_mkdirat+0x1b9/0x310 [ 43.075920][ T7099] do_syscall_64+0xf3/0x1b0 [ 43.080411][ T7099] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 43.086297][ T7099] RIP: 0033:0x4449f9 [ 43.090200][ T7099] 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 [ 43.109798][ T7099] RSP: 002b:00007ffc6f32e688 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 [ 43.118192][ T7099] RAX: ffffffffffffffda RBX: 00007ffc6f32e690 RCX: 00000000004449f9 [ 43.126167][ T7099] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 0000000020000400 [ 43.134130][ T7099] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000400de0 [ 43.142096][ T7099] R10: 00007ffc6f32e560 R11: 0000000000000246 R12: 0000000000402660 [ 43.150173][ T7099] R13: 00000000004026f0 R14: 0000000000000000 R15: 0000000000000000 [ 43.159528][ T7099] Kernel Offset: disabled [ 43.163996][ T7099] Rebooting in 86400 seconds..