Segfault in SparseArrayLookup #283
Comments
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@gcasa Is this the right way to file this, or should I move this to a different repo or to |
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Do you have a reduced test case (ideally linking nothing but the runtime)? It looks as if it may be trying to send a message in +load to a class that is not yet loaded. |
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I think I might have forgotten to link something. I don't have a minimal test case -- as I said, I have no idea where this came from. |
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I looked and it seems like I have linked everything. |
Is the order of the +load messages defined? It doesn't occur in the libs-opal testcases, so if this is the reason for the segfault, then the load message order is different. |
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@davidchisnall I believe this is the problem... + (void)load
{
[CGImageDestination registerDestinationClass: self];
} |
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I changed those to |
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Sending a message to a superclass in +load should be fine. Sending one to any other class that鈥檚 defined in the same library should also be fine. I wonder if somehow the selector for the message being sent is not resolved. That could result in an out of bounds access in the uninitialised stable. |
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I have changed @davidchisnall Might this be related? The abort appears in pthreads in |
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Does Apple objc4 work on Linux? If it does, it might be possible to test on objc4 to see if the issue is in libobjc2. |
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@davidchisnall How can I compile libobjc2 with debug symbols included? |
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I passed |
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I'm kinda busy, but here's my last GDB session if anyone wants to take a look: |
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@davidchisnall The issue appears to be that the isa of CAAction is 0x0, which is not a valid protocol version. I don't know why it ended up this way. |
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What is the -fobjc-runtime= flag that you鈥檙e passing to clang? |
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@davidchisnall |
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I can try switching to the newly released v2.2.1 |
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I'm building like: export CC=clang-14
export CXX=clang++-14
export CXXFLAGS="-std=c++11"
export RUNTIME_VERSION=gnustep-2.1
export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig
export LD=/usr/bin/ld.gold
export LDFLAGS="-fuse-ld=/usr/bin/ld.gold -L/usr/local/lib"
rm -Rf build
mkdir build && cd build
cmake ../ \
-DCMAKE_C_COMPILER=${CC} \
-DCMAKE_CXX_COMPILER=${CXX} \
-DCMAKE_ASM_COMPILER=${CC} \
-DCMAKE_LINKER=${LD} \
-DUSE_GOLD_LINKER=YES \
-DCMAKE_MODULE_LINKER_FLAGS="${LDFLAGS}" \
-DTESTS=OFF \
-DCMAKE_BUILD_TYPE=Debug \
-DCMAKE_EXPORT_COMPILE_COMMANDS=1
cmake --build .
sudo -E make install
sudo ldconfig |
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The issue still appears in v2.2.1. |
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clang 14 is pretty old, but should be fine. There are a few fixes for the v2 ABI after that, but I think they matter only on Windows. I wonder if the +load is somehow being called before we've loaded the |
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@davidchisnall Is there anything that I should run in
I think this issue is unrelated to the |
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It runs into |
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@davidchisnall Are you available to look at this more or not? Should I post this to |
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I鈥檓 completely confused by this. It looks as if your binary contains things that shouldn鈥檛 be possible. |
Hello 馃憢, I have encountered a segfault in
SparseArrayLookupduring the initialization of my port of the application GitY. Here is the backtrace from GDB:Interestingly, I have not encountered this when running any of the libs-opal tests, such as
images. I have confirmed with GDB thatimagescalls+[CGImageDestinationTIFF load]without segfaulting. Therefore, I don't know in which component this came from.The Objective-C components that are linked to by
GitYare:It's possible that one of those has messed something up in their
+loadmethods, but I'm not exactly sure. If needed, I can send you binaries of my GNUstep installation, compilelibobjc2with different flags, peek around in GDB, or whatever else would be needed.The text was updated successfully, but these errors were encountered: