witness: userret: returning with the following locks held:
exclusive rwlock solock r = 0 (0xfffffd8068f5edf8)
#0  witness_lock+0x44d
#1  unp_solock_peer+0xa6 sys/kern/uipc_usrreq.c:163
#2  uipc_usrreq+0x7c6 sys/kern/uipc_usrreq.c:350
#3  sosend+0x61b sys/kern/uipc_socket.c:657
#4  sendit+0x65d sys/kern/uipc_syscalls.c:682
#5  sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:589
#6  syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline]
#6  syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585
#7  Xsyscall+0x128
panic: witness_warn
Starting stack trace...
panic(ffffffff82593e80) at panic+0x16b sys/kern/subr_prf.c:233
witness_warn(2,0,ffffffff82620d13) at 
witness_warn+0x65e
userret(ffff8000212e8a90) at userret+0x265 sys/kern/kern_sig.c:2012
syscall(ffff8000257b60b0) at syscall+0x57e mi_syscall_return sys/sys/syscall_mi.h:128 [inline]
syscall(ffff8000257b60b0) at syscall+0x57e sys/arch/amd64/amd64/trap.c:607
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x800c27cf9f0, count: 252
End of stack trace.