panic: receive 1: so ADDR, so_type 3, sb

Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported
panic: receive 1: so ADDR, so_type 3, sb_cc 6586				1	1547d	1547d

panic: receive 1: so 0xfffffd805e556000, so_type 3, sb_cc 2878
Stopped at      db_enter+0x18:  addq    $0x8,%rsp
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
*138643  15787      0           0          0    0  dhclient
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic(ffffffff821a4f02) at panic+0x15c sys/kern/subr_prf.c:207
soreceive(fffffd805e556000,0,ffff80001d382c98,0,0,ffff80001d382ba4) at soreceive+0x16ac sys/kern/uipc_socket.c:823
soo_read(fffffd80693fe3c0,ffff80001d382c98,0) at soo_read+0x53 sys/kern/sys_socket.c:70
dofilereadv(ffff80001d3494e8,6,ffff80001d382c98,0,ffff80001d382d80) at dofilereadv+0x1a2 sys/kern/sys_generic.c:236
sys_read(ffff80001d3494e8,ffff80001d382d30,ffff80001d382d80) at sys_read+0x83 sys/kern/sys_generic.c:156
syscall(ffff80001d382e00) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7fffff5700, count: 7
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