executing program
syzkaller login: [   21.446482] ------------[ cut here ]------------
[   21.446866] WARNING: CPU: 3 PID: 3030 at ./include/net/sock.h:1507 strp_data_ready+0x2b7/0x390
[   21.447644] Kernel panic - not syncing: panic_on_warn set ...
[   21.447644] 
[   21.448391] CPU: 3 PID: 3030 Comm: syzkaller782056 Not tainted 4.14.0-rc5-next-20171018+ #8
[   21.449254] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
[   21.449937] Call Trace:
[   21.450128]  dump_stack+0x194/0x257
[   21.450349]  ? arch_local_irq_restore+0x53/0x53
[   21.450628]  ? vsnprintf+0x1ed/0x1900
[   21.450858]  panic+0x1e4/0x41c
[   21.451061]  ? refcount_error_report+0x214/0x214
[   21.451342]  ? show_regs_print_info+0x65/0x65
[   21.451613]  ? __warn+0x1a9/0x1e0
[   21.451821]  ? strp_data_ready+0x2b7/0x390
[   21.452117]  __warn+0x1c4/0x1e0
[   21.452419]  ? strp_data_ready+0x2b7/0x390
[   21.452788]  report_bug+0x211/0x2d0
[   21.453421]  fixup_bug+0x40/0x90
[   21.453737]  do_trap+0x260/0x390
[   21.454061]  do_error_trap+0x120/0x390
[   21.454416]  ? sk_filter_trim_cap+0x3f3/0x9b0
[   21.454758]  ? do_trap+0x390/0x390
[   21.455045]  ? strp_data_ready+0x2b7/0x390
[   21.455437]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   21.455863]  do_invalid_op+0x1b/0x20
[   21.456151]  invalid_op+0x18/0x20
[   21.456471] RIP: 0010:strp_data_ready+0x2b7/0x390
[   21.456919] RSP: 0018:ffff88003d92f7d8 EFLAGS: 00010293
[   21.457425] RAX: ffff880037550100 RBX: ffff88006cc69c48 RCX: ffffffff847af437
[   21.458089] RDX: 0000000000000000 RSI: ffff88006da7d7e0 RDI: ffffffff85cc4be0
[   21.458756] RBP: ffff88003d92f7f8 R08: 0000000000000002 R09: 1ffffffff0cddfbe
[   21.459423] R10: ffff88003d92f6c0 R11: 1ffff10006eaa27b R12: ffff88006da7d740
[   21.460094] R13: ffff88006cc69c50 R14: ffff88003d92f960 R15: ffff88006da7d740
[   21.460775]  ? strp_data_ready+0x2b7/0x390
[   21.461179]  ? strp_data_ready+0x2b7/0x390
[   21.461575]  psock_data_ready+0x56/0x70
[   21.461944]  unix_dgram_sendmsg+0xa72/0x1600
[   21.462367]  ? unix_shutdown+0x870/0x870
[   21.462749]  ? lock_downgrade+0x990/0x990
[   21.463169]  ? lock_release+0xa40/0xa40
[   21.463552]  unix_seqpacket_sendmsg+0xf3/0x160
[   21.463978]  ? unix_dgram_sendmsg+0x1600/0x1600
[   21.464415]  sock_sendmsg+0xca/0x110
[   21.464766]  ___sys_sendmsg+0x31c/0x890
[   21.465150]  ? copy_msghdr_from_user+0x590/0x590
[   21.465594]  ? find_held_lock+0x35/0x1d0
[   21.465976]  ? handle_mm_fault+0x248/0x8d0
[   21.466380]  ? __do_page_fault+0x64c/0xd60
[   21.466784]  ? __fdget+0x18/0x20
[   21.467098]  __sys_sendmmsg+0x1e6/0x5f0
[   21.467466]  ? __sys_sendmmsg+0x1e6/0x5f0
[   21.467856]  ? SyS_sendmsg+0x50/0x50
[   21.468205]  ? mm_fault_error+0x2c0/0x2c0
[   21.468584]  ? do_vfs_ioctl+0x486/0x1520
[   21.468963]  ? _cond_resched+0x14/0x30
[   21.469341]  ? __fd_install+0x69b/0x6a0
[   21.469711]  ? sock_map_fd+0x53/0x70
[   21.470063]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   21.470529]  SyS_sendmmsg+0x35/0x60
[   21.470872]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   21.471311] RIP: 0033:0x435629
[   21.471604] RSP: 002b:00007ffdb4638668 EFLAGS: 00000217 ORIG_RAX: 0000000000000133
[   21.472313] RAX: ffffffffffffffda RBX: 00000000004002b0 RCX: 0000000000435629
[   21.473066] RDX: 0000000000000005 RSI: 0000000020c7b000 RDI: 0000000000000004
[   21.473770] RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
[   21.474686] R10: 0000000020008010 R11: 0000000000000217 R12: 0000000000000000
[   21.475354] R13: 0000000000401fa0 R14: 0000000000402030 R15: 0000000000000000
[   21.476148] Dumping ftrace buffer:
[   21.476515]    (ftrace buffer empty)
[   21.476857] Kernel Offset: disabled
[   21.477209] Rebooting in 86400 seconds..