Hi,
How does allocator_may_return_null=1 work?
When I run the following code with address sanitizer compile option, it
gave me some error (see below for detail). After I use
allocator_may_return_null=1
in ASAN_OPTIONS, the error still there.
int main()
{
// test bad alloc exception
try{
void* ladd = new char[999999999999];
if (ladd == 0)
printf("return null pointer\n");
}
catch(...)
{
printf("expection throw\n");
}
return 0;
}
compiler option:
g++ -g -std=c++11 -lpthread -fsanitize=address -fno-omit-frame-pointer
foo.cpp -o foo
ASAN_OPTIONS=symbolize=1
bash-4.1$ ./foo
==9485==AddressSanitizer's allocator is terminating the process instead of
returning 0
==9485==*If you don't like this behavior set allocator_may_return_null=1*
==9485==AddressSanitizer CHECK failed:
../../../../libsanitizer/sanitizer_common/sanitizer_allocator.cc:216 "((0))
!= (0)" (0x0, 0x0)
#0 0x7fd80c924475 in AsanCheckFailed
../../../../libsanitizer/asan/asan_rtl.cc:67
#1 0x7fd80c93ecd9 in __sanitizer::CheckFailed(char const*, int, char
const*, unsigned long long, unsigned long long)
../../../../libsanitizer/sanitizer_common/sanitizer_termination.cc:77
#2 0x7fd80c929526 in __sanitizer::ReportAllocatorCannotReturnNull()
../../../../libsanitizer/sanitizer_common/sanitizer_allocator.cc:216
#3 0x7fd80c92958a in __sanitizer::ReturnNullOrDieOnFailure::OnOOM()
../../../../libsanitizer/sanitizer_common/sanitizer_allocator.cc:239
#4 0x7fd80c85a501 in
__sanitizer::LargeMmapAllocator<__asan::AsanMapUnmapCallback,
__sanitizer::ReturnNullOrDieOnFailure>::Allocate(__sanitizer::AllocatorStats*,
unsigned long, unsigned long)
../../../../libsanitizer/sanitizer_common/sanitizer_allocator_secondary.h:44
#5 0x7fd80c85a501 in
__sanitizer::CombinedAllocator<__sanitizer::SizeClassAllocator64<__asan::AP64>,
__sanitizer::SizeClassAllocatorLocalCache<__sanitizer::SizeClassAllocator64<__asan::AP64>
>, __sanitizer::LargeMmapAllocator<__asan::AsanMapUnmapCallback,
__sanitizer::ReturnNullOrDieOnFailure>
>::Allocate(__sanitizer::SizeClassAllocatorLocalCache<__sanitizer::SizeClassAllocator64<__asan::AP64>
>
>*, unsigned long, unsigned long)
../../../../libsanitizer/sanitizer_common/sanitizer_allocator_combined.h:62
#6 0x7fd80c85a501 in __asan::Allocator::Allocate(unsigned long,
unsigned long, __sanitizer::BufferedStackTrace*, __asan::AllocType, bool)
../../../../libsanitizer/asan/asan_allocator.cc:422
#7 0x7fd80c857e07 in __asan::asan_memalign(unsigned long, unsigned
long, __sanitizer::BufferedStackTrace*, __asan::AllocType)
../../../../libsanitizer/asan/asan_allocator.cc:856
#8 0x7fd80c91b35f in operator new[](unsigned long)
../../../../libsanitizer/asan/asan_new_delete.cc:93
#9 0x400aab in main /home/xfan/issue/linux_gas/foo.cpp:26
#10 0x35f561ed1c in __libc_start_main (/lib64/libc.so.6+0x35f561ed1c)
#11 0x400958 (/home/xfan/issue/linux_gas/foo+0x400958)
ASAN_OPTIONS=symbolize=1:*allocator_may_return_null=1*
bash-4.1$ ./foo
==9431==AddressSanitizer's allocator is terminating the process instead of
returning 0
==9431==*If you don't like this behavior set allocator_may_return_null=1*
==9431==AddressSanitizer CHECK failed:
../../../../libsanitizer/sanitizer_common/sanitizer_allocator.cc:216 "((0))
!= (0)" (0x0, 0x0)
#0 0x7fc4c10e8475 in AsanCheckFailed
../../../../libsanitizer/asan/asan_rtl.cc:67
#1 0x7fc4c1102cd9 in __sanitizer::CheckFailed(char const*, int, char
const*, unsigned long long, unsigned long long)
../../../../libsanitizer/sanitizer_common/sanitizer_termination.cc:77
#2 0x7fc4c10ed526 in __sanitizer::ReportAllocatorCannotReturnNull()
../../../../libsanitizer/sanitizer_common/sanitizer_allocator.cc:216
#3 0x7fc4c10ed5af in __sanitizer::DieOnFailure::OnOOM()
../../../../libsanitizer/sanitizer_common/sanitizer_allocator.cc:248
#4 0x7fc4c10df4a4 in operator new[](unsigned long)
../../../../libsanitizer/asan/asan_new_delete.cc:93
#5 0x400aab in main /home/xfan/issue/linux_gas/foo.cpp:26
#6 0x35f561ed1c in __libc_start_main (/lib64/libc.so.6+0x35f561ed1c)
#7 0x400958 (/home/xfan/issue/linux_gas/foo+0x400958)
I am using GCC 8.2, Red hat Linux.
Thanks,
Xingyan
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