[ 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 '10.128.1.65' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 34.985305] ------------[ cut here ]------------ [ 34.990417] WARNING: CPU: 0 PID: 8098 at fs/inode.c:343 inc_nlink.cold+0x11/0x18 [ 34.997956] Kernel panic - not syncing: panic_on_warn set ... [ 34.997956] [ 35.005324] CPU: 0 PID: 8098 Comm: syz-executor254 Not tainted 4.19.211-syzkaller #0 [ 35.013195] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.022535] Call Trace: [ 35.025110] dump_stack+0x1fc/0x2ef [ 35.028723] panic+0x26a/0x50e [ 35.031897] ? __warn_printk+0xf3/0xf3 [ 35.035768] ? inc_nlink.cold+0x11/0x18 [ 35.039722] ? __probe_kernel_read+0x130/0x1b0 [ 35.044295] ? __warn.cold+0x5/0x5a [ 35.047901] ? __warn+0xe4/0x200 [ 35.051250] ? inc_nlink.cold+0x11/0x18 [ 35.055203] __warn.cold+0x20/0x5a [ 35.058729] ? inc_nlink.cold+0x11/0x18 [ 35.062682] report_bug+0x262/0x2b0 [ 35.066292] do_error_trap+0x1d7/0x310 [ 35.070160] ? math_error+0x310/0x310 [ 35.073943] ? __irq_work_queue_local+0x101/0x160 [ 35.078765] ? irq_work_queue+0x29/0x80 [ 35.082722] ? error_entry+0x72/0xd0 [ 35.086416] ? trace_hardirqs_off_caller+0x6e/0x210 [ 35.091416] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.096241] invalid_op+0x14/0x20 [ 35.099693] RIP: 0010:inc_nlink.cold+0x11/0x18 [ 35.104253] Code: c0 74 04 3c 03 7e 08 8b 5d 48 e9 e7 68 b4 f9 4c 89 e7 e8 aa 99 a3 f9 eb ee e8 43 bd 6d f9 48 c7 c7 80 b0 74 88 e8 a2 ee fe ff <0f> 0b e9 29 6a b4 f9 e8 2b bd 6d f9 48 8d 7b 40 b8 ff ff 37 00 48 [ 35.123136] RSP: 0018:ffff88808cd47ce8 EFLAGS: 00010282 [ 35.128478] RAX: 0000000000000024 RBX: ffff88808d7976c0 RCX: 0000000000000000 [ 35.135743] RDX: 0000000000000000 RSI: ffffffff814dff01 RDI: ffffed10119a8f8f [ 35.143002] RBP: 0000000000000000 R08: 0000000000000024 R09: 0000000000000000 [ 35.150259] R10: 0000000000000005 R11: 0000000000000000 R12: ffff88808d797708 [ 35.157595] R13: ffff88808d64d580 R14: ffff8880b4e7d780 R15: ffff8880a8d88c80 [ 35.164855] ? vprintk_func+0x81/0x180 [ 35.168727] ? inc_nlink.cold+0x11/0x18 [ 35.172701] v9fs_vfs_mkdir_dotl+0x4eb/0x610 [ 35.177093] ? v9fs_vfs_create_dotl+0x30/0x30 [ 35.181570] ? cap_task_prctl+0xb50/0xd30 [ 35.185707] ? capable_wrt_inode_uidgid+0x1d2/0x220 [ 35.190719] ? generic_permission+0x116/0x4d0 [ 35.195197] ? inode_permission.part.0+0x10c/0x450 [ 35.200135] vfs_mkdir+0x508/0x7a0 [ 35.203660] do_mkdirat+0x262/0x2d0 [ 35.207273] ? __ia32_sys_mknod+0x120/0x120 [ 35.211576] ? trace_hardirqs_off_caller+0x6e/0x210 [ 35.216573] ? do_syscall_64+0x21/0x620 [ 35.220531] do_syscall_64+0xf9/0x620 [ 35.224329] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.229499] RIP: 0033:0x7f8e1f81e829 [ 35.233198] Code: 28 c3 e8 5a 14 00 00 66 2e 0f 1f 84 00 00 00 00 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 [ 35.252094] RSP: 002b:00007fff7fbe30e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 [ 35.259780] RAX: ffffffffffffffda RBX: 00007fff7fbe30f8 RCX: 00007f8e1f81e829 [ 35.267027] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200002c0 [ 35.274287] RBP: 00007fff7fbe30f0 R08: 00007f8e1f7dcaf0 R09: 00007f8e1f7dcaf0 [ 35.281543] R10: 0000000020000340 R11: 0000000000000246 R12: 0000000000000000 [ 35.288802] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 35.296371] Kernel Offset: disabled [ 35.300023] Rebooting in 86400 seconds..