executing program
syzkaller login: [   18.628221] ------------[ cut here ]------------
[   18.628723] WARNING: CPU: 0 PID: 2977 at ./include/net/sock.h:1507 strp_data_ready+0x2b7/0x390
[   18.629586] Kernel panic - not syncing: panic_on_warn set ...
[   18.629586] 
[   18.630246] CPU: 0 PID: 2977 Comm: syzkaller082417 Not tainted 4.14.0-rc5-next-20171018+ #8
[   18.630982] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
[   18.631690] Call Trace:
[   18.631929]  dump_stack+0x194/0x257
[   18.632263]  ? arch_local_irq_restore+0x53/0x53
[   18.632685]  ? vsnprintf+0x1ed/0x1900
[   18.633040]  panic+0x1e4/0x41c
[   18.633367]  ? refcount_error_report+0x214/0x214
[   18.633840]  ? show_regs_print_info+0x65/0x65
[   18.634273]  ? __warn+0x1a9/0x1e0
[   18.634596]  ? strp_data_ready+0x2b7/0x390
[   18.635037]  __warn+0x1c4/0x1e0
[   18.635367]  ? strp_data_ready+0x2b7/0x390
[   18.635792]  report_bug+0x211/0x2d0
[   18.636153]  fixup_bug+0x40/0x90
[   18.636495]  do_trap+0x260/0x390
[   18.636818]  do_error_trap+0x120/0x390
[   18.637168]  ? sk_filter_trim_cap+0x3f3/0x9b0
[   18.637848]  ? do_trap+0x390/0x390
[   18.638096]  ? strp_data_ready+0x2b7/0x390
[   18.638417]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   18.638846]  do_invalid_op+0x1b/0x20
[   18.639177]  invalid_op+0x18/0x20
[   18.639491] RIP: 0010:strp_data_ready+0x2b7/0x390
[   18.639924] RSP: 0018:ffff8800692677d8 EFLAGS: 00010293
[   18.640410] RAX: ffff8800691647c0 RBX: ffff880039485c48 RCX: ffffffff847af437
[   18.641112] RDX: 0000000000000000 RSI: ffff88003966e0a0 RDI: ffffffff85cc4be0
[   18.641819] RBP: ffff8800692677f8 R08: 0000000000000002 R09: 1ffffffff0cddfbe
[   18.642479] R10: ffff8800692676c0 R11: 1ffff1000d22cb53 R12: ffff88003966e000
[   18.643208] R13: ffff880039485c50 R14: ffff880069267960 R15: ffff88003966e000
[   18.643930]  ? strp_data_ready+0x2b7/0x390
[   18.644361]  ? strp_data_ready+0x2b7/0x390
[   18.644784]  psock_data_ready+0x56/0x70
[   18.645181]  unix_dgram_sendmsg+0xa72/0x1600
[   18.645632]  ? unix_shutdown+0x870/0x870
[   18.646000]  ? lock_downgrade+0x990/0x990
[   18.646399]  ? lock_release+0xa40/0xa40
[   18.646836]  unix_seqpacket_sendmsg+0xf3/0x160
[   18.647249]  ? unix_dgram_sendmsg+0x1600/0x1600
[   18.647666]  sock_sendmsg+0xca/0x110
[   18.648056]  ___sys_sendmsg+0x31c/0x890
[   18.648432]  ? copy_msghdr_from_user+0x590/0x590
[   18.648869]  ? find_held_lock+0x35/0x1d0
[   18.649242]  ? handle_mm_fault+0x248/0x8d0
[   18.649664]  ? __do_page_fault+0x64c/0xd60
[   18.649997]  ? __fdget+0x18/0x20
[   18.650201]  __sys_sendmmsg+0x1e6/0x5f0
[   18.650463]  ? __sys_sendmmsg+0x1e6/0x5f0
[   18.650769]  ? SyS_sendmsg+0x50/0x50
[   18.651066]  ? mm_fault_error+0x2c0/0x2c0
[   18.651402]  ? syscall_return_slowpath+0x2b3/0x510
[   18.651841]  ? prepare_exit_to_usermode+0x2d0/0x2d0
[   18.652291]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   18.652746]  SyS_sendmmsg+0x35/0x60
[   18.653079]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   18.653500] RIP: 0033:0x435809
[   18.653787] RSP: 002b:00007ffe02548918 EFLAGS: 00000217 ORIG_RAX: 0000000000000133
[   18.654425] RAX: ffffffffffffffda RBX: 00000000004002b0 RCX: 0000000000435809
[   18.655080] RDX: 0000000000000004 RSI: 0000000020ed9f10 RDI: 0000000000000004
[   18.655715] RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
[   18.656356] R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000000000
[   18.656998] R13: 0000000000402180 R14: 0000000000402210 R15: 0000000000000000
[   18.657879] Dumping ftrace buffer:
[   18.658266]    (ftrace buffer empty)
[   18.658593] Kernel Offset: disabled
[   18.659399] Rebooting in 86400 seconds..