rlog segfault on CentOS 7

[Michael Watters]

I am attempting to use rcs/rlog on CentOS 7 and the process is 
segfaulting when run on one of our rcs files.

Here is the command output when run from the command line.

address@hidden pc104]# rlog source-after-upgrade.tar,v

RCS file: source-after-upgrade.tar,v
Working file: source-after-upgrade.tar
head: 1.2
branch:
locks: strict
        d35110: 1.2
access list:
symbolic names:
        INITIAL_IMPORT_RELEASE_TAG: 1.1.1.1
        INITIAL_IMPORT_VENDOR_TAG: 1.1.1
keyword substitution: b
total revisions: 3;     selected revisions: 3
description:
----------------------------
revision 1.2    locked by: d35110;
Segmentation fault (core dumped)

gdb shows that the process received a signal 11 in the string_from_atat 
function.

Reading symbols from /usr/bin/rcs...Reading symbols from 
/usr/lib/debug/usr/bin/rcs.debug...done.
done.
Core was generated by `/usr/bin/rcs rlog source-after-upgrade.tar,v'.
Program terminated with signal 11, Segmentation fault.
#0  0x000000000040e5ca in string_from_atat (space=0x16e7200, 
atat=0x1bae340) at b-fro.c:389
389           r[i].beg = 1 + (i ? atat->holes[i - 1] : atat->beg);

Here is the full backtrace.

#0  0x000000000040e5ca in string_from_atat (space=0x16e7200, 
atat=0x1bae340) at b-fro.c:389
        f = 0x16e72c0
        count = 594082
        r = <error reading variable r (Cannot access memory at address 
0x7ffcf5276810)>
        cb = {string = 0x7f89115a4740 "@GZ\021\211\177", size = 24015744}
        i = <optimized out>
#1  0x000000000040ac92 in count_a_d (edits=<optimized out>, 
d=0x7ffcf5b87308, a=0x7ffcf5b87310) at rlog.c:134
        s = <optimized out>
        totals = <optimized out>
#2  putadelta (address@hidden, editscript=0x16e7b18, 
address@hidden, address@hidden "  
lines: +%ld -%ld") at rlog.c:189
        a = 24015552
        d = 140724430992208
        out = 0x7f891138c400 <_IO_2_1_stdout_>
        datebuf = "2006/08/25 
22:21:00\000\374\177\000\000\001\000\000\000\000\000\000\000\340|n\001\000\000\000", 
<incomplete sequence \335>
        log = <optimized out>
#3  0x000000000040c1c4 in putrunk (insDelFormat=0x421e0d "  lines: +%ld 
-%ld") at rlog.c:224
        ptr = 0x16e7a28
#4  rlog_main (address@hidden "rlog", argc=1, 
address@hidden, argv=<optimized out>, address@hidden) at rlog.c:986
        tip = 0x16e7a28
        defbr = 0x0
        strictly_locking = true
        kws = 5
        repo_filename = 0x16e7308 "source-after-upgrade.tar,v"
        locks = 0x2036940
        exitstatus = 0
        branchflag = false
        lockflag = false
        datesel = {in = 0x0, by = 0x0}
        criteria = {revs = 0x0, actual = 0x0, authors = 0x0, lockers = 
0x0, states = 0x0}
        insDelFormat = 0x421e0d "  lines: +%ld -%ld"
        out = 0x7f891138c400 <_IO_2_1_stdout_>
        a = <optimized out>
        newargv = 0x7ffcf5b876d0
        accessListString = 0x421dff "\naccess list:"
        accessFormat = 0x421dfa "\n\t%s"
        headFormat = 0x421fa8 "\nRCS file: %s\nWorking file: 
%s\nhead:%s%s\nbranch:%s%s\nlocks:%s"
        symbolFormat = 0x421df1 "\n\t%s: %s"
        descflag = true
        selectflag = true
        onlylockflag = false
        onlyRCSflag = false
        pre5 = false
        shownames = true
        revno = <optimized out>
#5  0x0000000000402659 in dispatch (argv=0x7ffcf5b876d0, argc=2, 
cmd=0x7ffcf5b882c9 "rlog", sub=0x40afb0 <rlog_main>, exitval=<synthetic 
pointer>) at super.c:74

Any idea on what would cause this?  I've looked at line 389 in the 
b-fro.c file but I don't see anything that would cause a segfault there.