Comment # 1 on bug 1207914 from Luca Beltrame

Actually scratch that. I thought it was enough, but it wasn't. Here's a proper
backtrace:


#0  0x00007ffff799180f in EVP_CIPHER_CTX_set_key_length (c=c@entry=0x0,
keylen=keylen@entry=20) at crypto/evp/evp_enc.c:994
#1  0x00005555555a3f39 in tr_rc4_set_key (key_length=20, key=0x7ffff66a4210
"", handle=0x0) at ../libtransmission/crypto-utils-openssl.c:208
#2  initRC4 (crypto=crypto@entry=0x7ffff0051970,
setme=setme@entry=0x7ffff0051978, key=0x5555555ca7d1 "keyA") at
../libtransmission/crypto.c:106
#3  0x00005555555a40a0 in tr_cryptoEncryptInit (crypto=0x7ffff0051970) at
../libtransmission/crypto.c:140
#4  0x00005555555a54d4 in readYb (inbuf=0x7ffff0050e40,
handshake=0x7ffff0051ad0) at ../libtransmission/handshake.c:460
#5  canRead (io=<optimized out>, arg=<optimized out>,
piece=<optimized out>) at ../libtransmission/handshake.c:1060
#6  0x000055555558d829 in canReadWrapper (io=0x7ffff00515b0) at
../libtransmission/peer-io.c:211
#7  0x00005555555b2a56 in UTP_ProcessIncoming (conn=0x7ffff0051220,
packet=<optimized out>, len=<optimized out>, syn=<optimized
out>) at ../third-party/libutp/utp.cpp:2158
#8  0x00005555555bcb23 in UTP_IsIncomingUTP.constprop.0.isra.0
(send_to_userdata=send_to_userdata@entry=0x5555555e38b0,
buffer=buffer@entry=0x7ffff66a4bc0 "\001", len=len@entry=125,
to=to@entry=0x7ffff66a4b40, send_to_proc=<optimized out>,
incoming_proc=<optimized out>, 
    tolen=<optimized out>) at ../third-party/libutp/utp.cpp:2587
#9  0x000055555556d878 in tr_utpPacket (fromlen=<optimized out>,
ss=0x5555555e38b0, from=0x7ffff66a4b40, buflen=125, buf=0x7ffff66a4bc0
"\001") at ../libtransmission/tr-utp.c:181
#10 event_callback (s=<optimized out>, type=<optimized out>,
sv=0x5555555e38b0) at ../libtransmission/tr-udp.c:285
#11 0x00007ffff7f56925 in event_persist_closure (ev=<optimized out>,
base=0x7ffff0000bb0) at /usr/src/debug/libevent-2.1.12-stable/event.c:1638
#12 event_process_active_single_queue (base=base@entry=0x7ffff0000bb0,
activeq=0x7ffff0001020, max_to_process=max_to_process@entry=2147483647,
endtime=endtime@entry=0x0) at
/usr/src/debug/libevent-2.1.12-stable/event.c:1697
#13 0x00007ffff7f582bf in event_process_active (base=0x7ffff0000bb0) at
/usr/src/debug/libevent-2.1.12-stable/event.c:1798
#14 event_base_loop (base=base@entry=0x7ffff0000bb0, flags=flags@entry=0) at
/usr/src/debug/libevent-2.1.12-stable/event.c:2040
#15 0x00007ffff7f58577 in event_base_dispatch
(event_base=event_base@entry=0x7ffff0000bb0) at
/usr/src/debug/libevent-2.1.12-stable/event.c:1832
#16 0x0000555555576fd8 in libeventThreadFunc (veh=0x5555555dfae0) at
../libtransmission/trevent.c:263
#17 0x000055555555f547 in ThreadFunc (_t=0x5555555e3e60) at
../libtransmission/platform.c:104
#18 0x00007ffff769398d in start_thread (arg=<optimized out>) at
pthread_create.c:442
#19 0x00007ffff771a380 in clone3 () at
../sysdeps/unix/sysv/linux/x86_64/clone3.S:81