Controller and Target Crash while using Socks Proxy

I found a bug where Controller and Target both would crash while downloading a file using Socks Proxy

The crash will happen randomly anytime your downloading or browsing using the socks proxy but I found a specific procedure to reproduce this bug

Both Target and Controller are running in keepalive mode
On Controller open Firefox and set it to use revsh socks proxy
Make sure that "Always ask you where to save files" is selected in Firefox / Preferences / General
Now try to browse a local network webserver and download a file that is +20MB in size in my test it was "vlc-2.2.6-win32.exe" and instead of choosing "Save" choose "Cancel"
Controller and Target will both crash

here is the last part of strace output from controller:

read(4, "\xbd\x13\x65\x9e\x51\x0e\x36\xcc\xec\x2f\x62\xd5\x5c\x25\xeb\xe6\x8d\xfe\xcc\x50\x10\x02\x31\xe9\xf3\x8f\xe0\x1f\x93\xfa\xaa\x20"..., 4128) = 914
read(4, 0x63a76a, 3214) = -1 EAGAIN (Resource temporarily unavailable)
select(5, [4], NULL, NULL, NULL) = 1 (in [4])
read(4, "\xd2\xb5\xe6\x61\x80\x2f\x27\x1c\x7c\x60\xcc\x4c\x1c\x54\x25\x65\x45\xb2\x90\xdb\xe1\xb0\xd5\xb7\x46\xfa\xcc\xb9\x09\xf7\x30\x7b"..., 3214) = 1420
read(4, 0x63acf6, 1794) = -1 EAGAIN (Resource temporarily unavailable)
select(5, [4], NULL, NULL, NULL) = 1 (in [4])
read(4, "\xeb\x6f\x06\x8d\xc7\xd7\xac\x40\x4a\x2c\xeb\x86\xf5\xe1\x32\x0e\xbb\x41\xa1\x7a\x82\x55\x86\x9d\xa3\xd6\x5c\x6b\x61\x8b\x94\x9c"..., 1794) = 1420
read(4, 0x63b282, 374) = -1 EAGAIN (Resource temporarily unavailable)
select(5, [4], NULL, NULL, NULL) = 1 (in [4])
read(4, "\x1f\x60\xfa\x65\xff\x58\xd6\x69\x95\xac\x27\xf7\xb2\xba\xd8\xd6\xf8\x12\x81\x2e\x2d\xda\xe5\x3c\x52\x03\xe3\x10\xbb\xa6\x21\xd8"..., 374) = 374
write(5, "\xb3\xf2\x26\xf0\xbc\x33\x7c\xa4\x8f\xec\xf6\xab\x53\xea\xd1\x88\x83\xdd\xa6\x0b\xbc\xb3\x85\xd6\x1e\x94\x5a\xcb\xe0\x61\x38\xbb"..., 4096) = -1 EPIPE (Broken pipe)
--- SIGPIPE {si_signo=SIGPIPE, si_code=SI_USER, si_pid=24072, si_uid=0} ---
+++ killed by SIGPIPE +++

emptymonkey / revsh

Controller and Target Crash while using Socks Proxy #17