Re: SIGSEGV in dc, at bcode.c:277 (function reset_bmachine())

В Sat, 10 Apr 2010 17:14:54 -0700
David Wolfskill <david_at_catwhisker.org> пишет:

> As these things go, this probably isn't as critical as most thinsg
> disussed on this list, but I happened to notice it today, built a
> debugging world and at least cornered the annoying little varmint.
> 
> Sorry; no patch at this time. :-(
> 
> Here's how to reproduce it: while running CURRENT, invoke dc(1)
> using the command-line expression-soecification ("-e ..."), thus:
> 
> freebeast(9.0-C)[2] dc -e "6 2/p"
> Segmentation fault (core dumped)
> freebeast(9.0-C)[3] 
> 
> This was running:
> 
> FreeBSD freebeast.catwhisker.org 9.0-CURRENT FreeBSD 9.0-CURRENT #1
> r206447: Sat Apr 10 14:49:56 PDT 2010
> root_at_freebeast.catwhisker.org:/common/S1/obj/usr/src/sys/GENERIC  i386
> 

Also, when using the option -f file must be core dump :(

foo# echo '6 2/p' > /tmp/test
foo# dc -f /tmp/test
Segmentation fault (core dumped)
foo# gdb /usr/bin/dc dc.core 
GNU gdb 6.1.1 [FreeBSD]
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This GDB was configured as "i386-marcel-freebsd"...
Core was generated by `dc'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /lib/libcrypto.so.6...done.
Loaded symbols for /lib/libcrypto.so.6
Reading symbols from /lib/libc.so.7...done.
Loaded symbols for /lib/libc.so.7
Reading symbols from /libexec/ld-elf.so.1...done.
Loaded symbols for /libexec/ld-elf.so.1
#0  0x08049818 in reset_bmachine (src=0x804fc48) at /usr/src/usr.bin/dc/bcode.c:277
277             bmachine.readstack[0] = *src;
(gdb) bt
#0  0x08049818 in reset_bmachine (src=0x804fc48) at /usr/src/usr.bin/dc/bcode.c:277
#1  0x0804947e in procfile (fname=0xbfbfea22 "/tmp/test") at /usr/src/usr.bin/dc/dc.c:75
#2  0x0804951f in main (argc=3, argv=0xbfbfe8fc) at /usr/src/usr.bin/dc/dc.c:96
(gdb) quit
foo# uname -a
FreeBSD foo.vyborg.ru 9.0-CURRENT FreeBSD 9.0-CURRENT #1: Sun Apr 11 21:00:05 MSD 2010     root_at_foo.vyborg.ru:/usr/obj/usr/src/sys/GENERIC  i386