[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.44' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 51.586051] ------------[ cut here ]------------ [ 51.591002] WARNING: CPU: 0 PID: 8406 at net/kcm/kcmsock.c:629 kcm_write_msgs+0xf72/0x1740 [ 51.599403] Kernel panic - not syncing: panic_on_warn set ... [ 51.599403] [ 51.606766] CPU: 0 PID: 8406 Comm: syz-executor414 Not tainted 4.14.175-syzkaller #0 [ 51.614639] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.624120] Call Trace: [ 51.626710] dump_stack+0x13e/0x194 [ 51.630343] panic+0x1f9/0x42d [ 51.633547] ? add_taint.cold+0x16/0x16 [ 51.637530] ? kcm_write_msgs+0xf72/0x1740 [ 51.641766] ? kcm_write_msgs+0xf72/0x1740 [ 51.646001] __warn.cold+0x2f/0x30 [ 51.649532] ? ist_end_non_atomic+0x10/0x10 [ 51.653851] ? kcm_write_msgs+0xf72/0x1740 [ 51.658085] report_bug+0x20a/0x248 [ 51.661704] do_error_trap+0x195/0x2d0 [ 51.665578] ? math_error+0x2d0/0x2d0 [ 51.669361] ? tcp_sendpage+0x45/0x60 [ 51.673180] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 51.678017] invalid_op+0x1b/0x40 [ 51.681469] RIP: 0010:kcm_write_msgs+0xf72/0x1740 [ 51.686307] RSP: 0018:ffff8880973679f8 EFLAGS: 00010297 [ 51.691653] RAX: ffff8880a4efe340 RBX: 00000000000000c0 RCX: 0000000000000007 [ 51.698909] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880a5a41b42 [ 51.706162] RBP: ffff8880a5a41b40 R08: 0000000000000001 R09: 0000000000000000 [ 51.713419] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000008000 [ 51.720686] R13: ffff88808a69d380 R14: ffff8880a5a41a80 R15: 0000000000000000 [ 51.727961] ? kcm_write_msgs+0xf72/0x1740 [ 51.732188] kcm_sendmsg+0x1841/0x1df0 [ 51.736059] ? sock_has_perm+0x1c0/0x230 [ 51.740110] ? kcm_sendpage+0x14b0/0x14b0 [ 51.744260] ? security_socket_sendmsg+0x83/0xb0 [ 51.749008] ? kcm_sendpage+0x14b0/0x14b0 [ 51.753138] sock_sendmsg+0xc5/0x100 [ 51.756845] sock_write_iter+0x22c/0x370 [ 51.760887] ? sock_sendmsg+0x100/0x100 [ 51.764858] ? inode_has_perm.isra.0+0x153/0x1d0 [ 51.769597] ? iov_iter_init+0xa6/0x1c0 [ 51.773556] __vfs_write+0x44e/0x630 [ 51.777261] ? kernel_read+0x110/0x110 [ 51.781136] ? selinux_file_permission+0x7a/0x440 [ 51.785963] ? rw_verify_area+0xe1/0x2a0 [ 51.790004] vfs_write+0x192/0x4e0 [ 51.793531] SyS_write+0xf2/0x210 [ 51.797049] ? SyS_read+0x210/0x210 [ 51.800657] ? __do_page_fault+0x35b/0xb40 [ 51.804875] ? do_syscall_64+0x4c/0x640 [ 51.808841] ? SyS_read+0x210/0x210 [ 51.812449] do_syscall_64+0x1d5/0x640 [ 51.816323] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 51.821494] RIP: 0033:0x446b79 [ 51.824668] RSP: 002b:00007f2b8e2d3d98 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 51.832379] RAX: ffffffffffffffda RBX: 00000000006dbc48 RCX: 0000000000446b79 [ 51.839647] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 [ 51.846899] RBP: 00000000006dbc40 R08: 0000000000000000 R09: 0000000000000000 [ 51.854150] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc4c [ 51.861409] R13: 00000000200003c0 R14: 00000000004aea28 R15: 000000000000d4f5 [ 51.870065] Kernel Offset: disabled [ 51.873733] Rebooting in 86400 seconds..