executing program
syzkaller login: [   19.603889] ------------[ cut here ]------------
[   19.604411] WARNING: CPU: 2 PID: 2993 at ./include/net/sock.h:1507 strp_data_ready+0x2b7/0x390
[   19.605603] Kernel panic - not syncing: panic_on_warn set ...
[   19.605603] 
[   19.606287] CPU: 2 PID: 2993 Comm: syzkaller553538 Not tainted 4.14.0-rc5-next-20171018+ #8
[   19.607048] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
[   19.610190] Call Trace:
[   19.610439]  dump_stack+0x194/0x257
[   19.610780]  ? arch_local_irq_restore+0x53/0x53
[   19.611436]  ? vsnprintf+0x1ed/0x1900
[   19.611803]  panic+0x1e4/0x41c
[   19.612283]  ? refcount_error_report+0x214/0x214
[   19.612718]  ? show_regs_print_info+0x65/0x65
[   19.613145]  ? __warn+0x1a9/0x1e0
[   19.613570]  ? strp_data_ready+0x2b7/0x390
[   19.613961]  __warn+0x1c4/0x1e0
[   19.614323]  ? strp_data_ready+0x2b7/0x390
[   19.614763]  report_bug+0x211/0x2d0
[   19.615169]  fixup_bug+0x40/0x90
[   19.615667]  do_trap+0x260/0x390
[   19.616038]  do_error_trap+0x120/0x390
[   19.616457]  ? sk_filter_trim_cap+0x3f3/0x9b0
[   19.616934]  ? do_trap+0x390/0x390
[   19.617318]  ? strp_data_ready+0x2b7/0x390
[   19.617777]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   19.618300]  do_invalid_op+0x1b/0x20
[   19.618692]  invalid_op+0x18/0x20
[   19.619071] RIP: 0010:strp_data_ready+0x2b7/0x390
[   19.619587] RSP: 0018:ffff88003d52f7d8 EFLAGS: 00010293
[   19.620164] RAX: ffff88003e1cc700 RBX: ffff8800699efc48 RCX: ffffffff847af437
[   19.621163] RDX: 0000000000000000 RSI: ffff880068d29820 RDI: ffffffff85cc4be0
[   19.621828] RBP: ffff88003d52f7f8 R08: 0000000000000002 R09: 1ffffffff0cddfbe
[   19.622507] R10: ffff88003d52f6c0 R11: 1ffff10007c39b3b R12: ffff880068d29780
[   19.623167] R13: ffff8800699efc50 R14: ffff88003d52f960 R15: ffff880068d29780
[   19.623841]  ? strp_data_ready+0x2b7/0x390
[   19.624243]  ? strp_data_ready+0x2b7/0x390
[   19.624637]  psock_data_ready+0x56/0x70
[   19.625007]  unix_dgram_sendmsg+0xa72/0x1600
[   19.625431]  ? unix_shutdown+0x870/0x870
[   19.625801]  ? lock_downgrade+0x990/0x990
[   19.626415]  ? lock_release+0xa40/0xa40
[   19.626805]  unix_seqpacket_sendmsg+0xf3/0x160
[   19.627359]  ? unix_dgram_sendmsg+0x1600/0x1600
[   19.627844]  sock_sendmsg+0xca/0x110
[   19.628195]  ___sys_sendmsg+0x31c/0x890
[   19.628568]  ? copy_msghdr_from_user+0x590/0x590
[   19.629008]  ? find_held_lock+0x35/0x1d0
[   19.629392]  ? handle_mm_fault+0x248/0x8d0
[   19.629784]  ? __fget_light+0x297/0x380
[   19.630163]  ? fget_raw+0x20/0x20
[   19.630492]  ? __do_page_fault+0x64c/0xd60
[   19.630901]  ? __fdget+0x18/0x20
[   19.631221]  __sys_sendmmsg+0x1e6/0x5f0
[   19.631589]  ? __sys_sendmmsg+0x1e6/0x5f0
[   19.631980]  ? SyS_sendmsg+0x50/0x50
[   19.632330]  ? mm_fault_error+0x2c0/0x2c0
[   19.632717]  ? do_vfs_ioctl+0x486/0x1520
[   19.633092]  ? _cond_resched+0x14/0x30
[   19.633475]  ? __fd_install+0x69b/0x6a0
[   19.633846]  ? sock_map_fd+0x53/0x70
[   19.634399]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   19.634868]  SyS_sendmmsg+0x35/0x60
[   19.635211]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   19.635646] RIP: 0033:0x4354b9
[   19.635938] RSP: 002b:00007ffd0f4cbe18 EFLAGS: 00000217 ORIG_RAX: 0000000000000133
[   19.636637] RAX: ffffffffffffffda RBX: 00000000004002b0 RCX: 00000000004354b9
[   19.637293] RDX: 0000000000000003 RSI: 00000000204eff4c RDI: 0000000000000004
[   19.637952] RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
[   19.638785] R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000000000
[   19.639446] R13: 0000000000401e30 R14: 0000000000401ec0 R15: 0000000000000000
[   19.642114] Dumping ftrace buffer:
[   19.642686]    (ftrace buffer empty)
[   19.643026] Kernel Offset: disabled
[   19.643360] Rebooting in 86400 seconds..