Re: [Various] libc/1208: segfault in fclose on fdopen'ed FILE pointer

[Andreas Jaeger <aj@arthur.rhein-neckar.de>]

>>>>> H J Lu writes:

>> 
>> >Number:         1208
>> >Category:       libc
>> >Synopsis:       segfault in fclose on fdopen'ed FILE pointer
>> >Confidential:   no
>> >Severity:       serious
>> >Priority:       medium
>> >Responsible:    libc-gnats
>> >State:          open
>> >Class:          sw-bug
>> >Submitter-Id:   unknown
>> >Arrival-Date:   Sat Jul 17 13:30:01 EDT 1999
>> >Last-Modified:
>> >Originator:     sascha@schumann.cx
>> >Organization:
>> net
>> >Release:        2.1.1
>> >Environment:
>> Alpha, egcs 1.1.2, Linux 2.2.10
>> >Description:
>> The following program segfaults on Alpha, but not on x86. We eventually hit 
>> this particular bug in one program on x86, but I'm not able to produce a short 
>> test program which works on that platform.
>> 
>> $ gdb fd
>> GNU gdb 4.17.0.11 with Linux support
>> ...
>> 
>> (gdb) r
>> Starting program: /home/sas/fd
>> Program received signal SIGSEGV, Segmentation fault.
>> 0x20000183000 in _IO_new_fclose ()
>> (gdb) bt
>> #0  0x20000183000 in _IO_new_fclose ()
>> #1  0x120000580 in main () at fd.c:14
>> #2  0x2000014f990 in __libc_start_main ()
>> 
>> (14 is the fclose statement)
>> 
>> >How-To-Repeat:
>> #include <stdio.h>
>> #include <sys/types.h>
>> #include <sys/stat.h>
>> #include <fcntl.h>
>> #include <unistd.h>
>> 
>> main() {
>> int f;
>> FILE *f2;
>> 
>> f = open("/dev/stdin", O_RDONLY);
>> f2 = fdopen(f, "r");
>> fclose(f2);
>> close(f);
>> }%0

HJ> I tried this program on my alpha box with glibc 2.1.1 and egcs
HJ> 1.1.2. It works just fine. If you can tell me how to reproduce
HJ> it on my alpha. I will look into it.

Read all emails, please.  That program is just fine.  Sascha didn't
provide a test program (he only offered the source but didn't ask for
them;-) to reproduce the bug.

Andreas
-- 
 Andreas Jaeger   aj@arthur.rhein-neckar.de    jaeger@informatik.uni-kl.de
  for pgp-key finger ajaeger@aixd1.rhrk.uni-kl.de