Date: Wed, 07 Oct 1998 22:38:04 -0700 From: Mike Smith <mike@smith.net.au> To: Studded <Studded@dal.net> Cc: Archie Cobbs <archie@whistle.com>, FreeBSD-Hackers@FreeBSD.ORG Subject: Re: mail in free(): warning: junk pointer, too high to make sense. Message-ID: <199810080538.WAA01196@dingo.cdrom.com> In-Reply-To: Your message of "Wed, 07 Oct 1998 17:31:46 PDT." <361C07F2.85106E15@dal.net>
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> Ok, I did that, then compiled a mail binary with -ggdb. Here's the > result: > > Core was generated by `mail'. > Program terminated with signal 6, Abort trap. > Cannot access memory at address 0x20027080. > #0 0x20080d51 in ?? () > (gdb) bt > #0 0x20080d51 in ?? () > #1 0x200805c4 in ?? () > #2 0x2007f01c in ?? () > #3 0x2007f058 in ?? () > #4 0x2008007d in ?? () > #5 0x200802ba in ?? () > #6 0x8e73 in execute (linebuf=0x0, contxt=110592) at lex.c:322 > #7 0x84c2 in __isctype () at v7.local.c:56 > #8 0xb0a2 in main (argc=1, argv=0xefbfd788) at main.c:95 > > Attempting to run it in gdb got a different response: This is a better idea. > (gdb) run > Starting program: /usr/home/myusername/./mail > mail in free(): error: junk pointer, too high to make sense. > > Program received signal SIGABRT, Aborted. > 0x20080d51 in kill () > (gdb) bt > #0 0x20080d51 in kill () > #1 0x200805c4 in abort () > #2 0x2007f01c in getdtablesize () > #3 0x2007f058 in getdtablesize () > #4 0x2008007d in getdtablesize () > #5 0x200802ba in free () > #6 0x9263 in setmsize (sz=0) at lex.c:445 > #7 0x88b2 in setfile (name=0x1b080 "/var/mail/myusername") at lex.c:146 > #8 0xb492 in main (argc=1, argv=0xefbfd768) at main.c:246 > > I hope this is what you were looking for. My experience with gdb is > limited, my C only slightly less so. :) Try 'frame 5', 'print msgvec'. mail(1) is extremely funky; there's lots of room for really bad scope abuse in it. You could try replacing all occurrences of 'msgvec' in lex.c with 'msgfoo' and see if the problem changes. -- \\ Sometimes you're ahead, \\ Mike Smith \\ sometimes you're behind. \\ mike@smith.net.au \\ The race is long, and in the \\ msmith@freebsd.org \\ end it's only with yourself. \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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