thanks
this is a dumb bug that released a vmalloc region
and then referenced data in the region
fixed for the next beta release
On Sun, 4 Apr 2010 22:25:49 +0200 Sven Mascheck wrote:
> Hello,
> I have a problem with the current (2010-03-09) find:
> (freshly unpacked)
> $ ./find . -exec echo {} +
> . ./bb2tok ./look ./pax [...] ./vmstate ./bzip2
> Segmentation fault (core dumped)
> $ uname -sr; dpkg -l libc6
> Linux 2.6.27.31
> [...]
> ii libc6 2.3.6.ds1-13etch10+b1
> All found files are displayed, the problem occurs later.
> I couldn't get insight with the provided binary, although
> I tried to provide gdb with the source.
> (gdb) bt
> #0 0xb7f5c938 in cmdclose () from
> /home/mascheck/tapes/shell/ast/arch/linux.i386/bin/../lib/libast.so
> #1 0x0804baaa in main ()
> I compiled it with CFLAGS=-g, but it was linked statically then, anyway.
> $ ldd arch/linux.i386/bin/find
> linux-gate.so.1 => (0xffffe000)
> libc.so.6 => /lib/tls/libc.so.6 (0xb7dce000)
> /lib/ld-linux.so.2 (0xb7f09000)
> I still got the segv,
> $ gdb ./arch/linux.i386/bin/find core
> Core was generated by `./arch/linux.i386/bin/find arch/linux.i386/bin/
> -exec echo {} +'.
> Program terminated with signal 11, Segmentation fault.
> #0 0x0808364e in cmdclose (cmd=0x68637261) at
> /home/mascheck/tapes/shell/ast/source/src/lib/libast/misc/cmdarg.c:343
> 343 if ((cmd->flags & CMD_EXACT) && cmd->argcount < cmd->argmax)
> (gdb) bt
> #0 0x0808364e in cmdclose (cmd=0x68637261) at
> /home/mascheck/tapes/shell/ast/source/src/lib/libast/misc/cmdarg.c:343
> #1 0x0804e4a1 in main (argc=6, argv=0xbff78d34) at
> /home/mascheck/tapes/shell/ast/source/src/cmd/tw/find.c:1856
> (gdb) print *cmd
> Cannot access memory at address 0x68637261
> Oh, and I guess, find would be so glad if -exec + would be
> documented, because David Korn himself gave birth to this
> feature in SVR4 -- where it was not documented, either ;-)
> My earlier hint to this list apparently got lost:
> On Thu, Jan 26, 2006 at 09:42:07PM +0100, Sven Mascheck wrote:
> >
> > - find actually implements the SVR4/SUSv3 "-exec cmd {} +".
> >
> > This is not documented (neither mentioned in the manual page,
> > nor in cmd/tw/RELEASE).
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