core:~# egdb /home/misha/bin/gotd
[...]
Reading symbols from /home/misha/bin/gotd...
(gdb) run -vvvvd
Starting program: /home/misha/bin/gotd -vvvvd
gotd: socket: /var/run/gotd.sock
gotd: user: misha
listen: gotd_accept: new client connected on fd 6 uid 1000 gid 1000
parent: recv_connect: new client uid 1000 connected on fd 5
parent: list-refs request from uid 1000
parent: starting auth for uid 1000 repository src
parent: proc auth /var/git/src.git is on fd 7
auth /var/git/src.git: authentication request received
auth /var/git/src.git: authenticating uid 1000 gid 1000
auth /var/git/src.git: src: Permission denied
parent: uid 1000: src: Permission denied
parent: uid 1000: disconnecting
parent: waiting for child PID 25599 to terminate
auth /var/git/src.git: shutting down

Program received signal SIGSEGV, Segmentation fault.
0x00000b9ad943f762 in gotd_dispatch_auth_child (fd=7, event=2, arg=0xb9d122b0510) at /home/misha/work/got/gotd/gotd.c:1143
1143                    log_warnx("uid %d: %s", client->euid, err->msg);
(gdb) bt
#0  0x00000b9ad943f762 in gotd_dispatch_auth_child (fd=7, event=2, arg=0xb9d122b0510) at /home/misha/work/got/gotd/gotd.c:1143
#1  0x00000b9cf77db41f in event_process_active (base=0xb9d512f9760) at /usr/src/lib/libevent/event.c:333
#2  event_base_loop (base=0xb9d512f9760, flags=<optimized out>) at /usr/src/lib/libevent/event.c:483
#3  0x00000b9ad943cb43 in main (argc=0, argv=0x78b213c7bff8) at /home/misha/work/got/gotd/gotd.c:1932
(gdb) p client
$1 = (struct gotd_client *) 0xb9cdc05a000
(gdb) p err
$2 = (const struct got_error *) 0xb9ad9514030 <custom_errors>
(gdb) p err->msg
$3 = 0xb9ad9514040 <custom_errors+16> "src: Permission denied"
(gdb) p client->euid
Cannot access memory at address 0xb9cdc06a170

Is this info enough?