Date: Sun, 15 Jan 2012 16:32:09 GMT From: Shane Ambler <FreeBSD@Shaneware.biz> To: freebsd-gnats-submit@FreeBSD.org Subject: misc/164144: Crash on sending float/double values to std::ostringstream Message-ID: <201201151632.q0FGW96B010738@red.freebsd.org> Resent-Message-ID: <201201151640.q0FGeABo097134@freefall.freebsd.org>
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>Number: 164144 >Category: misc >Synopsis: Crash on sending float/double values to std::ostringstream >Confidential: no >Severity: serious >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Sun Jan 15 16:40:09 UTC 2012 >Closed-Date: >Last-Modified: >Originator: Shane Ambler >Release: 9.0-RELEASE >Organization: >Environment: FreeBSD leader 9.0-RELEASE FreeBSD 9.0-RELEASE #0: Tue Jan 3 07:46:30 UTC 2012 root@farrell.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC amd64 >Description: In c++ code sending a float or double value to a std::ostringstream using a << operator causes an illegal instruction. Sending a long double in the same place works. I find clang++ g++ and g++46 produce the same results so expect this is within libc++. This bug was found running blender - it is used within the elbeem lib code for fluid sims. Within gdb the following example code gives - For float values -- Program received signal SIGILL, Illegal instruction. 0x00000008008e0060 in std::ostream::operator<< (this=0x7fffffffd2c0, __f=100.255997) at ostream.tcc:221 221 ostream.tcc: No such file or directory. in ostream.tcc Current language: auto; currently c++ For double values -- Program received signal SIGILL, Illegal instruction. 0x00000008008dfe6b in std::ostream::_M_insert<double> (this=0x7fffffffd2c0, __v=100.256) at ostream.tcc:221 221 ostream.tcc: No such file or directory. in ostream.tcc Current language: auto; currently c++ >How-To-Repeat: Build the following - clang++ test.cpp - and run #include <sstream> int main(int argc, char ** argv) { std::ostringstream testout; // broken testout << (float)100.256; // broken testout << (double)100.256; // works testout << (long double)100.256; // exit nicely if we get here return 0; } >Fix: >Release-Note: >Audit-Trail: >Unformatted:
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