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From: "hjl.tools at gmail dot com" <sourceware-bugzilla@sourceware.org> To: glibc-bugs@sources.redhat.com Subject: [Bug libc/12597] New: SSE4 strncmp failure Date: Mon, 21 Mar 2011 04:43:00 -0000 [thread overview] Message-ID: <bug-12597-131@http.sourceware.org/bugzilla/> (raw) http://sourceware.org/bugzilla/show_bug.cgi?id=12597 Summary: SSE4 strncmp failure Product: glibc Version: 2.13 Status: NEW Severity: normal Priority: P2 Component: libc AssignedTo: drepper.fsp@gmail.com ReportedBy: hjl.tools@gmail.com On Intel Core i7, I got [hjl@gnu-6 997]$ cat saved.c #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/mman.h> int main() { char *buf, *buf2; buf = (char*)mmap((void*)0x100000000, 0x2000 * 2, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); buf = mmap((char *)buf, 0x2000, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0); memset(buf, 'a', 0x2000); buf[0x1fff] = 0; buf2 = strdup(buf); if (strncmp (buf + 3994, buf2 + 2635, 6241) >= 0) abort (); return 0; } [hjl@gnu-6 997]$ gcc saved.c [hjl@gnu-6 997]$ ./a.out Segmentation fault [hjl@gnu-6 997]$ gdb a.out GNU gdb (GDB) 7.2.50.20110312-cvs Copyright (C) 2011 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-unknown-linux-gnu". For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>... Reading symbols from /export/home/hjl/bugs/libc/997/a.out...(no debugging symbols found)...done. (gdb) r Starting program: /export/home/hjl/bugs/libc/997/a.out Program received signal SIGSEGV, Segmentation fault. 0x0000003f7d3214a0 in __strncmp_sse42 () from /lib64/libc.so.6 (gdb) -- Configure bugmail: http://sourceware.org/bugzilla/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.
next reply other threads:[~2011-03-21 4:43 UTC|newest] Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top 2011-03-21 4:43 hjl.tools at gmail dot com [this message] 2011-03-21 4:52 ` [Bug libc/12597] " hjl.tools at gmail dot com 2011-03-21 9:39 ` drepper.fsp at gmail dot com
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