Debian GNU/Linux 7 syzkaller ttyS0

executing program
syzkaller login: [   32.633061] ------------[ cut here ]------------
[   32.633593] WARNING: CPU: 3 PID: 3001 at ./include/net/sock.h:1505 strp_data_ready+0x2b7/0x390
[   32.634263] Kernel panic - not syncing: panic_on_warn set ...
[   32.634263] 
[   32.634785] CPU: 3 PID: 3001 Comm: syzkaller177476 Not tainted 4.13.0-next-20170905+ #15
[   32.635428] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
[   32.636072] Call Trace:
[   32.636262]  dump_stack+0x194/0x257
[   32.636523]  ? arch_local_irq_restore+0x53/0x53
[   32.636856]  panic+0x1e4/0x417
[   32.637084]  ? __warn+0x1d9/0x1d9
[   32.637316]  ? show_regs_print_info+0x65/0x65
[   32.637661]  ? retint_kernel+0x10/0x10
[   32.637954]  ? strp_data_ready+0x2b7/0x390
[   32.638260]  __warn+0x1c4/0x1d9
[   32.638491]  ? strp_data_ready+0x2b9/0x390
[   32.638783]  ? strp_data_ready+0x2b7/0x390
[   32.639132]  report_bug+0x211/0x2d0
[   32.639390]  fixup_bug+0x40/0x90
[   32.639626]  do_trap+0x260/0x390
[   32.639868]  do_error_trap+0x120/0x390
[   32.640165]  ? find_held_lock+0x39/0x1d0
[   32.640447]  ? do_trap+0x390/0x390
[   32.640695]  ? strp_data_ready+0x2b7/0x390
[   32.640995]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   32.641332]  do_invalid_op+0x1b/0x20
[   32.641591]  invalid_op+0x18/0x20
[   32.641832] RIP: 0010:strp_data_ready+0x2b7/0x390
[   32.642192] RSP: 0018:ffff88003dc9f990 EFLAGS: 00010297
[   32.642590] RAX: ffff88003d380740 RBX: ffff880067985a48 RCX: 0000000000000000
[   32.643119] RDX: 0000000000000000 RSI: ffff88006c5b60e0 RDI: ffffffff85cc1060
[   32.643609] RBP: ffff88003dc9f9b0 R08: 0000000000000000 R09: 0000000000000001
[   32.644096] R10: ffff88003dc9f130 R11: ffffffff8705fca0 R12: ffff88006c5b6040
[   32.645217] R13: ffff880067985a50 R14: ffff880068947d40 R15: 0000000000000099
[   32.645749]  psock_data_ready+0x56/0x70
[   32.646045]  unix_stream_sendmsg+0x708/0xbe0
[   32.646370]  ? unix_stream_recvmsg+0x2c0/0x2c0
[   32.646718]  ? security_socket_sendmsg+0x89/0xb0
[   32.647059]  ? unix_stream_recvmsg+0x2c0/0x2c0
[   32.647375]  sock_sendmsg+0xca/0x110
[   32.647634]  ___sys_sendmsg+0x75b/0x8a0
[   32.647912]  ? copy_msghdr_from_user+0x590/0x590
[   32.648257]  ? lock_downgrade+0x990/0x990
[   32.648559]  ? handle_mm_fault+0x4a2/0x860
[   32.648851]  ? __handle_mm_fault+0x39c0/0x39c0
[   32.649177]  ? vmacache_find+0x61/0x270
[   32.649458]  ? __fdget+0x18/0x20
[   32.649695]  __sys_sendmsg+0xe5/0x210
[   32.649955]  ? __sys_sendmsg+0xe5/0x210
[   32.650246]  ? SyS_shutdown+0x290/0x290
[   32.650523]  ? __do_page_fault+0xb60/0xb60
[   32.650821]  ? fd_install+0x2b/0x60
[   32.651094]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   32.651442]  SyS_sendmsg+0x2d/0x50
[   32.651688]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   32.652020] RIP: 0033:0x4351d9
[   32.652247] RSP: 002b:00007ffc27db3b88 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   32.652771] RAX: ffffffffffffffda RBX: 00000000004002b0 RCX: 00000000004351d9
[   32.653275] RDX: 0000000000008080 RSI: 00000000203a3000 RDI: 0000000000000003
[   32.653767] RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
[   32.654272] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
[   32.654769] R13: 0000000000401b50 R14: 0000000000401be0 R15: 0000000000000000
[   32.655454] Dumping ftrace buffer:
[   32.655750]    (ftrace buffer empty)
[   32.656051] Kernel Offset: disabled
[   32.656309] Rebooting in 86400 seconds..