https://bugs.kde.org/show_bug.cgi?id=368507
Bug ID: 368507
Summary: valgrind throws std::bad_alloc on memory allocations
larger than 34255421416 bytes
Product: valgrind
Version: 3.10.0
Platform: RedHat RPMs
OS: Linux
Status: UNCONFIRMED
Severity: crash
Priority: NOR
Component: general
Assignee: jsew...@acm.org
Reporter: tgra...@umiacs.umd.edu
Memory allocations of 34255421417 and higher cause a std::bad_alloc exception
to be thrown when running a process with valgrind even though the process runs
fine on it's own. This is not a memory overhead issue since I've run this on a
machine with >250GB free memory and a machine with <50GB free memory and had
the same results. If the allocation is lowered to 34255421416 the exception is
not thrown.
-bash-4.2$ cat test.cpp
/* Hello World program */
#include<iostream>
#include <stdio.h>
#include <unistd.h>
using namespace std;
typedef struct test test;
struct test {
char arr[34255421417] = {};
};
int main()
{
cout << "Before Allocation\n";
try{
test * t1 = new test;
}catch(const std::exception &exc){
std::string exception = exc.what();
std::cerr << "Caught exception: " + exception + "\n";
}
cout << "After Allocation\n";
cin.get();
return 0;
}
-bash-4.2$ g++ -std=c++11 test.cpp
-bash-4.2$ valgrind --tool=cachegrind ./a.out
==43814== Cachegrind, a cache and branch-prediction profiler
==43814== Copyright (C) 2002-2013, and GNU GPL'd, by Nicholas Nethercote et al.
==43814== Using Valgrind-3.10.0 and LibVEX; rerun with -h for copyright info
==43814== Command: ./a.out
==43814==
--43814-- warning: L3 cache found, using its data for the LL simulation.
Before Allocation
Caught exception: std::bad_alloc
After Allocation
==43814==
==43814== I refs: 1,477,163
==43814== I1 misses: 1,756
==43814== LLi misses: 1,683
==43814== I1 miss rate: 0.11%
==43814== LLi miss rate: 0.11%
==43814==
==43814== D refs: 499,289 (371,405 rd + 127,884 wr)
==43814== D1 misses: 12,494 ( 10,762 rd + 1,732 wr)
==43814== LLd misses: 7,472 ( 6,209 rd + 1,263 wr)
==43814== D1 miss rate: 2.5% ( 2.8% + 1.3% )
==43814== LLd miss rate: 1.4% ( 1.6% + 0.9% )
==43814==
==43814== LL refs: 14,250 ( 12,518 rd + 1,732 wr)
==43814== LL misses: 9,155 ( 7,892 rd + 1,263 wr)
==43814== LL miss rate: 0.4% ( 0.4% + 0.9% )
-bash-4.2$ ./a.out
Before Allocation
After Allocation
-bash-4.2$ free -g
total used free shared buff/cache available
Mem: 251 2 33 0 215 248
Swap: 3 0 3
-bash-4.2$ valgrind --version
valgrind-3.10.0
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