panic: memory chunk 0xfffff8004f0a407f is already allocated!
cpuid = 0
Trace beginning at frame 0xfffff80117a7f678
chunk_mark_allocated() at chunk_mark_allocated+0x9e 0xffffffff80655e5e 
chunk_mark_allocated() at chunk_mark_allocated+0x9e 0xffffffff80655e5e 
_kmalloc() at _kmalloc+0x684 0xffffffff80657444 
dup_sockaddr() at dup_sockaddr+0x20 0xffffffff806c9ca0 
soreceive() at soreceive+0x2ca 0xffffffff806c5a2a 
kern_recvmsg() at kern_recvmsg+0xf7 0xffffffff806cba17 
Debugger("panic")

CPU0 stopping CPUs: 0x0000003e
 stopped
Stopped at      Debugger+0x7c:  movb    $0,0xbdaf09(%rip)
db>