the basic tutorial crashes in 2.26.1

darthvolvo · 2013-03-09T00:09:28

Following the basic tutorial in the latest release, the program segfaults. This is on 64-bit linux. Valgrind output:==4057== Memcheck, a memory error detector ==4057== Copyright (C) 2002-2012, and GNU GPL'd, by Julian Seward et al. ==4057== Using Valgrind-3.8.1 and LibVEX; rerun with -h for copyright info ==4057== Command: ./foo ==4057== ==4057== Invalid read of size 8 ==4057== at 0x4EC68C8: std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::string const&) (in /usr/lib/libstdc++.so.6.0.9) ==4057== by 0x4075E0: CopyConstructString(std::string const&, std::string*) (scriptstdstring.cpp:125) ==4057== by 0x449A5F: X64_CallFunction(unsigned long const*, int, unsigned long (*)(), unsigned long&, bool) (as_callfunc_x64_gcc.cpp:142) ==4057== Address 0x0 is not stack'd, malloc'd or (recently) free'd ==4057== ==4057== ==4057== Process terminating with default action of signal 11 (SIGSEGV) ==4057== Access not within mapped region at address 0x0 ==4057== at 0x4EC68C8: std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::string const&) (in /usr/lib/libstdc++.so.6.0.9) ==4057== by 0x4075E0: CopyConstructString(std::string const&, std::string*) (scriptstdstring.cpp:125) ==4057== by 0x449A5F: X64_CallFunction(unsigned long const*, int, unsigned long (*)(), unsigned long&, bool) (as_callfunc_x64_gcc.cpp:142) ==4057== If you believe this happened as a result of a stack ==4057== overflow in your program's main thread (unlikely but ==4057== possible), you can try to increase the size of the ==4057== main thread stack using the --main-stacksize= flag. ==4057== The main thread stack size used in this run was 8388608. ==4057== ==4057== HEAP SUMMARY: ==4057== in use at exit: 67,922 bytes in 366 blocks ==4057== total heap usage: 766 allocs, 400 frees, 90,995 bytes allocated ==4057== ==4057== LEAK SUMMARY: ==4057== definitely lost: 0 bytes in 0 blocks ==4057== indirectly lost: 0 bytes in 0 blocks ==4057== possibly lost: 35 bytes in 1 blocks ==4057== still reachable: 67,887 bytes in 365 blocks ==4057== suppressed: 0 bytes in 0 blocks ==4057== Rerun with --leak-check=full to see details of leaked memory ==4057== ==4057== For counts of detected and suppressed errors, rerun with: -v ==4057== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 5 from 5) Code attached.

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Started by darthvolvo March 04, 2013 09:32 PM

9 comments, last by WitchLord 11 years, 1 month ago

WitchLord

4,834

March 09, 2013 12:09 AM

I found the problem. The compiler was optimizing away a local variable in X64_CallFunction because it didn't see that it was updated by the assembler code.

I've checked in the fix in revision 1588.

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the basic tutorial crashes in 2.26.1

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