BIRD 2.0.1 Segmentation fault when configured with merge paths

[Petko Bordjukov]

Hello,

Example config file that causes the SEGFAULT:

router id 192.168.1.1;

protocol kernel {
        merge paths;
        ipv6 {
                export all;
        };
}

Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x000056445cef23ea in krt_set_merge_paths (cc=0x0, merge=1, limit=16) at obj/conf/cf-parse.y:819
819       cc->ra_mode = merge ? RA_MERGED : RA_OPTIMAL;
(gdb) bt
#0  0x000056445cef23ea in krt_set_merge_paths (cc=0x0, merge=1, limit=16) at obj/conf/cf-parse.y:819
#1  0x000056445cefe0d5 in cf_parse () at obj/conf/cf-parse.y:4391
#2  0x000056445cf02d1c in config_parse (c=0x56445ec8b3f0) at conf/conf.c:140
#3  0x000056445cf93b8e in unix_read_config (cp=0x7ffe249d0930, name=0x56445cfb02d4 "bird.conf")
    at sysdep/unix/main.c:203
#4  0x000056445cf93bd5 in read_config () at sysdep/unix/main.c:213
#5  0x000056445cf94f21 in main (argc=1, argv=0x7ffe249d0a68) at sysdep/unix/main.c:855
(gdb) list
814     krt_set_merge_paths(struct channel_config *cc, uint merge, uint limit)
815     {
816       if ((limit <= 0) || (limit > 255))
817         cf_error("Merge paths limit must be in range 1-255");
818
819       cc->ra_mode = merge ? RA_MERGED : RA_OPTIMAL;
820       cc->merge_limit = limit;
821     }
822
823     static void
(gdb)

Kernel version:
Linux edge 4.14.13-1-ARCH #1 SMP PREEMPT Wed Jan 10 11:14:50 UTC 2018 x86_64 GNU/Linux

I am able to provide core dump and binary if necessary.

Cheers,
P.