Boost C++ Libraries: Ticket #9912: shared_ptr SEGV in Android debug builds

attachment set

anonymous — Tue, 15 Apr 2014 18:35:34 GMT

attachment → shared_ptr_segv.tbz.tgz

sample app w/ shared_ptr SEGV

Peter Dimov — Thu, 17 Apr 2014 12:50:58 GMT

What __ARM_ARCH_*__ macro is defined on the Nexus 7?

cc set

Andrey Semashev — Thu, 17 Apr 2014 13:09:57 GMT

cc Andrey.Semashev@… added

ian@… — Fri, 18 Apr 2014 21:44:33 GMT

The Android NDK supports compiling for two different arm abis. The default is ARMv5TE and it also supports ARMv7-A. These are configured through the armeabi and armeabi-v7a values, respectively.

It is my understanding that armeabi is a subset of armeabi-v7a so that a binary compiled for armeabi should work on all arm android devices.

I did a quick test to answer your question. I grabbed all the ARM_ARCH macros checked in smart_ptr/detail/spinlock_gcc_arm.hpp (these where the only references I could find in the sample app I posted) and created the following function:

void arm_arch() {

#if defined(ARM_ARCH_7)

const char* arch="defined(ARM_ARCH_7)";

#endif #if defined(ARM_ARCH_7A)

const char* arch="defined(ARM_ARCH_7A)";

#endif #if defined(ARM_ARCH_7R)

const char* arch="defined(ARM_ARCH_7R)";

#endif #if defined(ARM_ARCH_7M)

const char* arch="defined(ARM_ARCH_7M)";

#endif #if defined(ARM_ARCH_7EM)

const char* arch="defined(ARM_ARCH_7EM)";

#endif #if defined(ARM_ARCH_7S)

const char* arch="defined(ARM_ARCH_7S)";

#endif #if defined(ARM_ARCH_6)

const char* arch="defined(ARM_ARCH_6)";

#endif #if defined(ARM_ARCH_6J)

const char* arch="defined(ARM_ARCH_6J)";

#endif #if defined(ARM_ARCH_6K)

const char* arch="defined(ARM_ARCH_6K)";

#endif #if defined(ARM_ARCH_6Z)

const char* arch="defined(ARM_ARCH_6Z)";

#endif #if defined(ARM_ARCH_6ZK)

const char* arch="defined(ARM_ARCH_6ZK)";

#endif #if defined(ARM_ARCH_6T2)

const char* arch="defined(ARM_ARCH_6T2)";

#endif

}

As you might expect, none are defined when compiled for armeabi. When compiled for armeabi-v7a, ARM_ARCH_7A is defined.

Also, the armeabi binary exhibits the crash on the Nexus 7, while the armeabi-v7a does not.

Andrey Semashev — Sat, 19 Apr 2014 07:43:17 GMT

Could you also attach the output of command g++ <flags> -dM -E - < /dev/null where <flags> are the compiler switches used by NDK to enable ARMv5TE target?

Peter Dimov — Sat, 19 Apr 2014 09:01:05 GMT

Also, the armeabi binary exhibits the crash on the Nexus 7, while the armeabi-v7a does not.

The problem is that, while the ARMv7 and ARMv6 instruction sets have support for memory barriers (the former via a dedicated instruction, DMB, the latter by using the coprocessor #15), earlier instruction sets do not. (Presumably pre-ARMv6 chips didn't support multiprocessing.)

Since the Nexus 7 is a multicore device (I suppose), it needs the memory barriers to be present in the code for the spinlock to work properly. But, since the default configuration doesn't define any ARMv6/ARMv7 macro, we have no way of inserting a memory barrier as we have to assume an earlier instruction set.

In principle, one should be able to compile for ARMv6+ while still using the earlier ABI, but I don't know how.

I'm not sure how we can fix that problem on our side. The only option seems to be to disable spinlock_gcc_arm.hpp altogether when not on ARMv6+ and fall back to phtreads.

ian@… — Mon, 21 Apr 2014 17:01:49 GMT

arm-linux-androideabi-g++ -MMD -MP -MF ./obj/local/armeabi/objs-debug/shared_ptr_crash/main.o.d -fpic -ffunction-sections -funwind-tables -fstack-protector -no-canonical-prefixes -march=armv5te -mtune=xscale -msoft-float -fno-exceptions -fno-rtti -mthumb -Os -g -DNDEBUG -fomit-frame-pointer -fno-strict-aliasing -finline-limit=64 -O0 -UNDEBUG -marm -fno-omit-frame-pointer -I/Users/iwhoyt/projects/speedtestnet-android/toolchain/ndk/sources/cxx-stl/gnu-libstdc++/4.6/include -I/Users/iwhoyt/projects/speedtestnet-android/toolchain/ndk/sources/cxx-stl/gnu-libstdc++/4.6/libs/armeabi/include -I/Users/iwhoyt/projects/speedtestnet-android/toolchain/ndk/sources/cxx-stl/gnu-libstdc++/4.6/include/backward -Ijni -DANDROID -Wa,--noexecstack -Wformat -Werror=format-security -frtti -fexceptions -std=gnu++11 -I/Users/iwhoyt/projects/speedtestnet-android/toolchain/ndk/platforms/android-8/arch-arm/usr/include -dM -E - < /dev/null

cc1: warning: command line option '-std=gnu++11' is valid for C++/ObjC++ but not for C [enabled by default]
cc1: warning: command line option '-frtti' is valid for C++/ObjC++ but not for C [enabled by default]
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