linux-kernel - fscanf changes value when reading . cc version 4.1.2 20071124 (Red Hat 4.1.2-42)

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Date:	Tue, 12 Aug 2008 10:39:16 -0500
From:	Beverly Seavey <seavey@...stat.wisc.edu>
To:	linux-kernel@...r.kernel.org
Subject: fscanf changes value when reading .  cc version 4.1.2 20071124 (Red
 Hat 4.1.2-42)

hornbill% 10:36>g++ -v
Using built-in specs.
Target: i386-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man 
--infodir=/usr/share/info --enable-shared --enable-threads=posix 
--enable-checking=release --with-system-zlib --enable-__cxa_atexit 
--disable-libunwind-exceptions --enable-libgcj-multifile 
--enable-languages=c,c++,objc,obj-c++,java,fortran,ada 
--enable-java-awt=gtk --disable-dssi --enable-plugin 
--with-java-home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre 
--with-cpu=generic --host=i386-redhat-linux
Thread model: posix
gcc version 4.1.2 20071124 (Red Hat 4.1.2-42)
hornbill% 10:36>



(gdb) watch *(allLeavesUpperBounds + 12)
Hardware watchpoint 1: *(allLeavesUpperBounds + 12)
(gdb) run
Starting program: 
/v/v03/s/seavey/private/condStuff/apD14L14-S07-75751_S04-1616-100f-NF
Hardware watchpoint 1: *(allLeavesUpperBounds + 12)
Hardware watchpoint 1: *(allLeavesUpperBounds + 12)
Hardware watchpoint 1: *(allLeavesUpperBounds + 12)
Hardware watchpoint 1: *(allLeavesUpperBounds + 12)
Hardware watchpoint 1: *(allLeavesUpperBounds + 12)
Hardware watchpoint 1: *(allLeavesUpperBounds + 12)

Old value = 
0                                                                            
<<<<<<<<<<<<<<< this I did
New value = 1
0x00546231 in _IO_vfscanf_internal () from /lib/libc.so.6
(gdb) cont
Continuing.
Hardware watchpoint 1: *(allLeavesUpperBounds + 12)

Old value = 1
New value = 
0                                                                         
<<<<<<<<<<<<<<< fscanf did this
0x00546231 in _IO_vfscanf_internal () from /lib/libc.so.6
(gdb) where
#0  0x00546231 in _IO_vfscanf_internal () from /lib/libc.so.6
#1  0x00547b33 in vfscanf () from /lib/libc.so.6
#2  0x0054c612 in fscanf () from /lib/libc.so.6
#3  0x0804b7e2 in readCompiled (readParamsPtr=0x870f070, treeCtr=14, 
numLeaves=1, allTreesLowerBounds=0x804efa0, allTreesUpperBounds=0x8050bc0)
    at apD14L14-S07-75751_S04-1616-100f-NF.c:880
#4  0x0804c230 in main () at apD14L14-S07-75751_S04-1616-100f-NF.c:423
(gdb)

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