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segfault caused by rmail-delete-backward

From: Jay Pfaffman
Subject: segfault caused by rmail-delete-backward
Date: Fri, 13 Jun 2003 14:20:59 -0700

This bug report will be sent to the Free Software Foundation,
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Please write in English, because the Emacs maintainers do not have
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In GNU Emacs 21.2.1 (i386-redhat-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2002-04-08 on porky.devel.redhat.com
configured using `configure  i386-redhat-linux --prefix=/usr --exec-prefix=/usr 
--bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc --datadir=/usr/share 
--includedir=/usr/include --libdir=/usr/lib --libexecdir=/usr/libexec 
--localstatedir=/var --sharedstatedir=/usr/com --mandir=/usr/share/man 
--infodir=/usr/share/info --with-gcc --with-pop --with-sound'
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: nil
  locale-coding-system: nil
  default-enable-multibyte-characters: t

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

sometimes when doing a rmail-delete-backward will cause a seg fault.
I've currently got C-d mapped to my own function which calls
rmail-delete-backward (and copies messages into a folder used by a
baysian spam filter), but it did this before I started doing that.
It's been difficult to report this error because often it won't happen
again when I do a restart.

I was unable to get it to happen when I did an "emacs -q".  I might be
able to provide the errant RMAIL file, but it looks like the segfault
might be dependent on BBDB or something else (and obviously don't want
it to go out to the whole world).  Still, emacs should *never*
segfault (this is the first time in my memory that it's done so).
This happens a couple times a week.  Not quite sure when this problem
started.  I'll be glad to provide whatever info I've omitted.

I guess you can see that I'm running RedHat Linux 7.3.

Here's the end of an strace:

stat64("/home/pfaffman/mail/ham", {st_mode=S_IFREG|0644, st_size=8991436, ...}) 
= 0
lstat64("/home/pfaffman/mail/.#ham", {st_mode=S_IFLNK|0777, st_size=44, ...}) = 0
readlink("/home/pfaffman/mail/.#ham", "address@hidden:1051634887", 100) = 44
getpid()                                = 8242
unlink("/home/pfaffman/mail/.#ham")     = 0
write(4, "address@hidden@\0\0)address@hidden", 16) = 16
gettimeofday({1055538198, 294959}, NULL) = 0
gettimeofday({1055538198, 295319}, NULL) = 0
stat64("/home/pfaffman/.bbdb", {st_mode=S_IFREG|0644, st_size=647906, ...}) = 0
stat64("/home/pfaffman/.bbdb", {st_mode=S_IFREG|0644, st_size=647906, ...}) = 0
stat64("/home/pfaffman/.bbdb", {st_mode=S_IFREG|0644, st_size=647906, ...}) = 0
--- SIGSEGV (Segmentation fault) ---
rt_sigaction(SIGSEGV, {SIG_DFL}, {0x80d6230, [], SA_RESTART|0x4000000}, 8) = 0
getpgid(0)                              = 8242
ioctl(0, 0x540f, [8241])                = 0
kill(-8262, SIGHUP)                     = 0
--- SIGCHLD (Child exited) ---
wait4(-1, 0xbfffb544, WNOHANG|WUNTRACED, NULL) = 0
sigreturn()                             = ? (mask now [SEGV])
kill(-8243, SIGHUP)                     = 0
--- SIGCHLD (Child exited) ---
wait4(-1, 0xbfffb544, WNOHANG|WUNTRACED, NULL) = -1 ECHILD (No child processes)
sigreturn()                             = ? (mask now [SEGV])
fstat64(6, {st_mode=S_IFREG|0664, st_size=0, ...}) = 0
write(6, "/home/pfaffman/.bbdb\n/home/pfaff"..., 100) = 100
close(6)                                = 0
munmap(0x400f8000, 4096)                = 0
rt_sigaction(SIGIO, {SIG_IGN}, {0x80deb50, [], SA_RESTART|0x4000000}, 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [SEGV], [SEGV], 8) = 0
getpid()                                = 8242
kill(8242, SIGSEGV)                     = 0
--- SIGSEGV (Segmentation fault) ---
+++ killed by SIGSEGV +++

Thanks.  I hope this helps.

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Jay Pfaffman                           address@hidden
+1-415-821-7507 (H)                    +1-415-812-5047 (M)

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