Date: Sun, 12 May 2002 14:22:36 -0700 From: Marcel Moolenaar <marcel@xcllnt.net> To: current@FreeBSD.org Subject: Keywords: pre-GCC3 tcsh coredump free/malloc reentrancy signal Message-ID: <20020512212236.GB20876@dhcp01.pn.xcllnt.net>
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Gang, I occasionally get tcsh coredumps (signal 6). I mostly ignored it, but today I decided to track it down for once. This is the backtrace: (gdb) bt #0 0x808e4a3 in access () #1 0x80ba9fa in abort () at /usr/src/lib/libc/../libc/stdlib/abort.c:78 #2 0x80b97a9 in wrtwarning (p=0x80ef54e "in free():") at /usr/src/lib/libc/../libc/stdlib/malloc.c:314 #3 0x80b97c8 in wrtwarning (p=0x80ef54e "in free():") at /usr/src/lib/libc/../libc/stdlib/malloc.c:315 #4 0x80ba5aa in malloc (size=1644) at /usr/src/lib/libc/../libc/stdlib/malloc.c:1093 #5 0x8079163 in smalloc (n=1644) at /usr/src/bin/csh/../../contrib/tcsh/tc.alloc.c:505 #6 0x80757d8 in ReBufferDisplay () at /usr/src/bin/csh/../../contrib/tcsh/ed.screen.c:506 #7 0x8077cf9 in ChangeSize (lins=24, cols=80) at /usr/src/bin/csh/../../contrib/tcsh/ed.screen.c:1742 #8 0x8071542 in check_window_size (force=0) at /usr/src/bin/csh/../../contrib/tcsh/ed.init.c:128 #9 0x8071564 in window_change (snum=28) at /usr/src/bin/csh/../../contrib/tcsh/ed.init.c:148 #10 <signal handler called> #11 0x80baa8f in memcpy () #12 0x80ba6c9 in free (ptr=0x814f600) at /usr/src/lib/libc/../libc/stdlib/malloc.c:1125 #13 0x8079287 in sfree (p=0x814f600) at /usr/src/bin/csh/../../contrib/tcsh/tc.alloc.c:586 #14 0x805c2ca in blkfree (av0=0x814f600) at /usr/src/bin/csh/../../contrib/tcsh/sh.misc.c:169 #15 0x8057600 in backeval (cp=0x8150900, literal=0) at /usr/src/bin/csh/../../contrib/tcsh/sh.glob.c:842 #16 0x80574e8 in dobackp (cp=0x8147060, literal=0) at /usr/src/bin/csh/../../contrib/tcsh/sh.glob.c:784 #17 0x8056aa1 in globexpand (v=0x814ac54) at /usr/src/bin/csh/../../contrib/tcsh/sh.glob.c:386 #18 0x8057171 in globall (v=0x814ac50) at /usr/src/bin/csh/../../contrib/tcsh/sh.glob.c:632 #19 0x80622c1 in set1 (var=0x814acf0, vec=0x814ac50, head=0x8130fc4, flags=2) at /usr/src/bin/csh/../../contrib/tcsh/sh.set.c:616 #20 0x806227a in set (var=0x814acf0, val=0x8147060, flags=2) at /usr/src/bin/csh/../../contrib/tcsh/sh.set.c:601 #21 0x8061a41 in doset (v=0x814f200, c=0x814cce0) at /usr/src/bin/csh/../../contrib/tcsh/sh.set.c:292 #22 0x8053428 in func (t=0x814cce0, bp=0x80f4a44) at /usr/src/bin/csh/../../contrib/tcsh/sh.func.c:149 #23 0x80608d7 in execute (t=0x814cce0, wanttty=634, pipein=0x0, pipeout=0x0) at /usr/src/bin/csh/../../contrib/tcsh/sh.sem.c:657 #24 0x8060b15 in execute (t=0x814ccc0, wanttty=634, pipein=0x0, pipeout=0x0) at /usr/src/bin/csh/../../contrib/tcsh/sh.sem.c:734 #25 0x804a847 in process (catch=0) at /usr/src/bin/csh/../../contrib/tcsh/sh.c:2125 #26 0x804a0f9 in srcunit (unit=3, onlyown=1, hflg=0, av=0x0) at /usr/src/bin/csh/../../contrib/tcsh/sh.c:1661 #27 0x8049cce in srcfile (f=0x814b700 "USER", onlyown=1, flag=0, av=0x0) at /usr/src/bin/csh/../../contrib/tcsh/sh.c:1468 #28 0x8049c70 in srccat (cp=0x814ca00, dp=0x80f64a4) at /usr/src/bin/csh/../../contrib/tcsh/sh.c:1441 #29 0x8049973 in main (argc=0, argv=0xbfbffaa4) at /usr/src/bin/csh/../../contrib/tcsh/sh.c:1301 Apparently what's happening is that tcsh get's interrupted while in free() and the signal handler itself calls malloc(). Note that this typically happens when I open a new GNOME terminal. I guess the grand question is: is this a genuine bug or just a nasty side effect of our malloc options? -- Marcel Moolenaar USPA: A-39004 marcel@xcllnt.net To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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