heap-use-after-free crash in test application #8

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1. CarterLi commented on Nov 3, 2020

   

   CarterLi

   on Nov 3, 2020

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   Strange, but I have no arm devices ( expect an android phone running Linux 4.19 ) to test.
   Did you try any other examples?
2. MatthiasMann commented on Nov 3, 2020

   

   MatthiasMann

   on Nov 3, 2020

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   Yes, in the file_server I also get crashes which I can 'solve' by removing when_all. But then I get other crashes :(
   I also get the following warning on compile:

   $ make
   /opt/OSELAS.Toolchain-2020.08.0/arm-v7a-linux-gnueabihf/gcc-10.2.1-clang-10.0.1-glibc-2.32-binutils-2.35-kernel-5.8-sanitized/bin/arm-v7a-linux-gnueabihf-g++ ./file_server.cpp ./mime_dicts.cpp -o file_server -O0 -rdynamic -D_LIBCPP_DEBUG_LEVEL=1 -fno-omit-frame-pointer -fsanitize=address -fcoroutines -g -Wall -std=c++20 -I../liburing/src/include -I.. -L/home/matthias/Documents/HDIOBox/OSELAS.BSP-NXP/platform-at1130/sysroot-target/usr/lib -I/home/matthias/Documents/HDIOBox/OSELAS.BSP-NXP/platform-at1130/sysroot-target/usr/include  -L../liburing/src -lfmt -luring -pthread
   ./file_server.cpp: In function 'task<> http_send_file(io_service&, std::string, int, int)':
   ./file_server.cpp:76:1: warning: statement has no effect [�]8;;https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wunused-value-Wunused-value�]8;;]
      76 | }
         | ^
   ./file_server.cpp:76:1: warning: statement has no effect [�]8;;https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wunused-value-Wunused-value�]8;;]
   

   these compiler warning go away when I remove the usages of when_all.
3. CarterLi commented on Nov 3, 2020

   

   CarterLi

   on Nov 3, 2020

   Last edited by CarterLi

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   Yes, in the file_server I also get crashes which I can 'solve' by removing when_all. But then I get other crashes :(
   I also get the following warning on compile:

   $ make
   /opt/OSELAS.Toolchain-2020.08.0/arm-v7a-linux-gnueabihf/gcc-10.2.1-clang-10.0.1-glibc-2.32-binutils-2.35-kernel-5.8-sanitized/bin/arm-v7a-linux-gnueabihf-g++ ./file_server.cpp ./mime_dicts.cpp -o file_server -O0 -rdynamic -D_LIBCPP_DEBUG_LEVEL=1 -fno-omit-frame-pointer -fsanitize=address -fcoroutines -g -Wall -std=c++20 -I../liburing/src/include -I.. -L/home/matthias/Documents/HDIOBox/OSELAS.BSP-NXP/platform-at1130/sysroot-target/usr/lib -I/home/matthias/Documents/HDIOBox/OSELAS.BSP-NXP/platform-at1130/sysroot-target/usr/include  -L../liburing/src -lfmt -luring -pthread
   ./file_server.cpp: In function 'task<> http_send_file(io_service&, std::string, int, int)':
   ./file_server.cpp:76:1: warning: statement has no effect [�]8;;https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wunused-value-Wunused-value�]8;;]
      76 | }
         | ^
   ./file_server.cpp:76:1: warning: statement has no effect [�]8;;https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wunused-value-Wunused-value�]8;;]
   

   these compiler warning go away when I remove the usages of when_all.

   when_{all,any} definitely need more work. I'll remove them for now.
4. CarterLi commented on Feb 8, 2021

   

   CarterLi

   on Feb 8, 2021

   Last edited by CarterLi

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   May relate to http://clang-developers.42468.n3.nabble.com/Miscompilation-heap-use-after-free-in-C-coroutines-td4070320.html

   Ref: https://github.com/CarterLi/liburing4cpp/blob/async/task.hpp#L33