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记录一个SIGABRT错误的解决

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 楼主| keer_zu 发表于 2023-2-10 18:18 | 显示全部楼层 |阅读模式


结果：


9182663e619ba8b928.png

SIGABRT
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 楼主| keer_zu 发表于 2023-2-10 19:14 | 显示全部楼层
尝试把可执行文件一起生成的.so库替换后，出现错误：
复制
  1. # ./EM
    

  2. unknown symbol: _ZN4nobo5infra2em8EMClient11getInstanceENS1_7FG_TYPEE referenced from EM
    

  3. ldd:FATAL: Could not resolve all symbols


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 楼主| keer_zu 发表于 2023-2-13 16:31 | 显示全部楼层
恢复了之前的.so文件，重新替换后没有上述问题，但是出现一下情况：
复制
  1. $ ntoaarch64-gdb EM EM.core
    

  2. GNU gdb (GDB) 8.2.1 [qnx710 r1522] (STABLE)
    

  3. Copyright (C) 2018 Free Software Foundation, Inc.
    

  4. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
    

  5. This is free software: you are free to change and redistribute it.
    

  6. There is NO WARRANTY, to the extent permitted by law.
    

  7. Type "show copying" and "show warranty" for details.
    

  8. This GDB was configured as "--host=x86_64-pc-linux-gnu --target=aarch64-unknown-nto-qnx7.1.0".
    

  9. Type "show configuration" for configuration details.
    

  10. For bug reporting instructions, please see:
    

  11. <http://www.qnx.com/support/bugreports>.
    

  12. Find the GDB manual and other documentation resources online at:
    

  13.     <http://www.gnu.org/software/gdb/documentation/>.
    


  14. 

  15. For help, type "help".
    

  16. Type "apropos word" to search for commands related to "word"...
    

  17. Reading symbols from EM...done.
    


  18. 

  19. warning: exec file is newer than core file.
    

  20. [New pid 3760199 tid 1]
    

  21. [New pid 3760199 tid 2]
    

  22. [New pid 3760199 tid 3]
    

  23. [New pid 3760199 tid 4]
    

  24. [New pid 3760199 tid 5]
    


  25. 

  26. warning: Could not load shared library symbols for 9 libraries, e.g. /mnt/usr/lib64/libEMClient.so.
    

  27. Use the "info sharedlibrary" command to see the complete listing.
    

  28. Do you need "set solib-search-path" or "set sysroot"?
    

  29. Program terminated with signal SIGSEGV, Segmentation fault.
    

  30. #0  0x0000000000000000 in ?? ()
    

  31. [Current thread is 4 (pid 3760199 tid 4)]
    

  32. (gdb) bt
    

  33. #0  0x0000000000000000 in ?? ()
    

  34. #1  0x0000000078003b0c in ?? ()
    

  35. Backtrace stopped: previous frame identical to this frame (corrupt stack?)


怀疑是堆栈破坏增加堆栈保护, 用编译参数-fstack-protector-all为所有函数插入保护代码，编译版本，打算再次带符号查看崩溃dump

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 楼主| keer_zu 发表于 2023-2-13 16:34 | 显示全部楼层
带符号查看core文件的方法是：

复制
  1. $ gdb xxx.symbol core.xxx


这就需要.symbol文件，查找.symbol文件的生成方式：
复制
  1. $ objcopy --only-keep-debug EM EM.symbol
    

  2. objcopy: Unable to recognise the format of the input file `EM'
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 楼主| keer_zu 发表于 2023-2-13 16:37 | 显示全部楼层
本帖最后由 keer_zu 于 2023-2-13 17:03 编辑

继而尝试解决：

复制
  1. 解决objcopy: Unable to recognise the format of the input file问题


的问题：

参考文章：
https://www.codeprj.com/blog/5b4bb01.html
https://www.cnblogs.com/water-moon/p/5983152.html

而我遇到的情况和上面不同，是用错了命令导致的，因为我的可执行文件是交叉编译的，所以：

复制
  1. ntoaarch64-objcopy --only-keep-debug EM EM.symbol
即可
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 楼主| keer_zu 发表于 2023-2-13 17:07 | 显示全部楼层
上述步骤抽取调试符号后：

复制
  1. $ ntoaarch64-gdb EM.symbol EM.core
    

  2. GNU gdb (GDB) 8.2.1 [qnx710 r1522] (STABLE)
    

  3. Copyright (C) 2018 Free Software Foundation, Inc.
    

  4. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
    

  5. This is free software: you are free to change and redistribute it.
    

  6. There is NO WARRANTY, to the extent permitted by law.
    

  7. Type "show copying" and "show warranty" for details.
    

  8. This GDB was configured as "--host=x86_64-pc-linux-gnu --target=aarch64-unknown-nto-qnx7.1.0".
    

  9. Type "show configuration" for configuration details.
    

  10. For bug reporting instructions, please see:
    

  11. <http://www.qnx.com/support/bugreports>.
    

  12. Find the GDB manual and other documentation resources online at:
    

  13.     <http://www.gnu.org/software/gdb/documentation/>.
    


  14. 

  15. For help, type "help".
    

  16. Type "apropos word" to search for commands related to "word"...
    

  17. Reading symbols from EM.symbol...(no debugging symbols found)...done.
    


  18. 

  19. warning: exec file is newer than core file.
    

  20. [New pid 3760199 tid 1]
    

  21. [New pid 3760199 tid 2]
    

  22. [New pid 3760199 tid 3]
    

  23. [New pid 3760199 tid 4]
    

  24. [New pid 3760199 tid 5]
    


  25. 

  26. warning: Could not load shared library symbols for 9 libraries, e.g. /mnt/usr/lib64/libEMClient.so.
    

  27. Use the "info sharedlibrary" command to see the complete listing.
    

  28. Do you need "set solib-search-path" or "set sysroot"?
    

  29. Program terminated with signal SIGSEGV, Segmentation fault.
    

  30. #0  0x0000000000000000 in ?? ()
    

  31. [Current thread is 4 (pid 3760199 tid 4)]
    

  32. (gdb) bt
    

  33. #0  0x0000000000000000 in ?? ()
    

  34. #1  0x0000000078003b0c in ?? ()
    

  35. Backtrace stopped: previous frame identical to this frame (corrupt stack?)
    

  36. (gdb)


还是一样，看来从栈已经破坏的文件中抽取符号还是老样子，这样做没有任何意义，尝试其他方式。
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 楼主| keer_zu 发表于 2023-2-13 17:09 | 显示全部楼层




此处插入知识点：
gdb加载调试符号（符号表)
  • 抽取调试符号：
    复制
    1. objcopy --only-keep-debug DEBUG版可执行文件 符号表文件名.symbol

  • 在gdb中加载符号表
    复制
    1. gdb --symbol=符号表文件名.symbol -exec=RELEASE版可执行文件

  • 也可以不抽取符号表，直接使用DEBUG版可执行文件作为符号表来源：
    复制
    1. gdb --symbol=DEBUG版可执行文件 -exec=RELEASE版可执行文件







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 楼主| keer_zu 发表于 2023-2-13 17:35 | 显示全部楼层
尝试加了-fstack-protector-all,希望栈能尽可能被保全


9428463ea03b328bd2.png

结果依然是：

289263ea040a4a2ae.png

是不是应该从
复制
  1. (no debugging symbols found)
这里找一下原因？可能因为没有符号，所以才看不到栈信息，继续吧
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 楼主| keer_zu 发表于 2023-2-13 18:20 | 显示全部楼层

加上如下编译参数：


得到新的编译结果，包含可执行文件和库，把可执行文件和两个动态库替换到目标板，运行，得到core文件。

然后把最新编译的可执行文件，库文件，和刚刚得到core文件放在host的某个目录下：

复制
  1. $ ntoaarch64-gdb EM EM.core
    

  2. GNU gdb (GDB) 8.2.1 [qnx710 r1522] (STABLE)
    

  3. Copyright (C) 2018 Free Software Foundation, Inc.
    

  4. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
    

  5. This is free software: you are free to change and redistribute it.
    

  6. There is NO WARRANTY, to the extent permitted by law.
    

  7. Type "show copying" and "show warranty" for details.
    

  8. This GDB was configured as "--host=x86_64-pc-linux-gnu --target=aarch64-unknown-nto-qnx7.1.0".
    

  9. Type "show configuration" for configuration details.
    

  10. For bug reporting instructions, please see:
    

  11. <http://www.qnx.com/support/bugreports>.
    

  12. Find the GDB manual and other documentation resources online at:
    

  13.     <http://www.gnu.org/software/gdb/documentation/>.
    


  14. 

  15. For help, type "help".
    

  16. Type "apropos word" to search for commands related to "word"...
    

  17. Reading symbols from EM...done.
    


  18. 

  19. warning: exec file is newer than core file.
    

  20. [New pid 4239431 tid 1]
    

  21. [New pid 4239431 tid 2]
    

  22. [New pid 4239431 tid 3]
    

  23. [New pid 4239431 tid 4]
    

  24. [New pid 4239431 tid 5]
    


  25. 

  26. warning: Could not load shared library symbols for 7 libraries, e.g. /mnt/usr/lib64/libvxlog.so.
    

  27. Use the "info sharedlibrary" command to see the complete listing.
    

  28. Do you need "set solib-search-path" or "set sysroot"?
    

  29. Program terminated with signal SIGSEGV, Segmentation fault.
    

  30. #0  0x0000000000000000 in ?? ()
    

  31. [Current thread is 4 (pid 4239431 tid 4)]
    

  32. (gdb) bt
    

  33. #0  0x0000000000000000 in ?? ()
    

  34. #1  0x0000000078004e54 in nobo::infra::em::EMClient::CommProxyListener::onAlive (this=0x110d6b28, alive=true)
    

  35.     at /home/zukeqiang/src/basic_service/EM/src/EMClient/EMClient.cpp:13
    

  36. #2  0x000000007802fff4 in nobo::infra::em::EMCommProxy::messageCallback (this=0x110efa08, msgid=65535, msg=0xffbc780)
    

  37.     at /home/zukeqiang/src/basic_service/EM/src/EMCommAPI/EMCommProxy.cpp:77
    

  38. #3  0x000000007803394c in std::__1::__invoke<void (nobo::infra::em::EMCommProxy::*&)(unsigned int, CFdbMessage*), nobo::infra::em::EMCommProxy*&, unsigned int, CFdbMessage*, void> (__a0=@0x110d7b80: 0x110efa08, __f=
    

  39.     @0x110d7b70: (void (nobo::infra::em::EMCommProxy::*)(nobo::infra::em::EMCommProxy * const, unsigned int, CFdbMessage *)) 0x7802fef8 <nobo::infra::em::EMCommProxy::messageCallback(unsigned int, CFdbMessage*)>)
    

  40.     at /home/zukeqiang/src/qnx/qnx710_host/target/qnx7/usr/include/c++/v1/type_traits:4294
    

  41. #4  std::__1::__apply_functor<void (nobo::infra::em::EMCommProxy::*)(unsigned int, CFdbMessage*), std::__1::tuple<nobo::infra::em::EMCommProxy*, std::__1::placeholders::__ph<1>, std::__1::placeholders::__ph<2> >, 0ul, 1ul, 2ul, std::__1::tuple<unsigned int&&, CFdbMessage*&&> > (__args=..., __bound_args=..., __f=
    

  42.     @0x110d7b70: (void (nobo::infra::em::EMCommProxy::*)(nobo::infra::em::EMCommProxy * const, unsigned int, CFdbMessage *)) 0x7802fef8 <nobo::infra::em::EMCommProxy::messageCallback(unsigned int, CFdbMessage*)>)
    

  43.     at /home/zukeqiang/src/qnx/qnx710_host/target/qnx7/usr/include/c++/v1/functional:2644
    

  44. #5  std::__1::__bind<void (nobo::infra::em::EMCommProxy::*)(unsigned int, CFdbMessage*), nobo::infra::em::EMCommProxy*, std::__1::placeholders::__ph<1> const&, std::__1::placeholders::__ph<2> const&>::operator()<unsigned int, CFdbMessage*> (
    

  45.     this=0x110d7b70) at /home/zukeqiang/src/qnx/qnx710_host/target/qnx7/usr/include/c++/v1/functional:2677
    

  46. #6  std::__1::__invoke<std::__1::__bind<void (nobo::infra::em::EMCommProxy::*)(unsigned int, CFdbMessage*), nobo::infra::em::EMCommProxy*, std::__1::placeholders::__ph<1> const&, std::__1::placeholders::__ph<2> const&>&, unsigned int, CFdbMessage*> (
    

  47.     __f=...) at /home/zukeqiang/src/qnx/qnx710_host/target/qnx7/usr/include/c++/v1/type_traits:4353
    

  48. #7  std::__1::__invoke_void_return_wrapper<void>::__call<std::__1::__bind<void (nobo::infra::em::EMCommProxy::*)(unsigned int, CFdbMessage*), nobo::infra::em::EMCommProxy*, std::__1::placeholders::__ph<1> const&, std::__1::placeholders::__ph<2> const&>&, unsigned int, CFdbMessage*> (__args#0=..., __args#1=@0xffbc5b4: 65535, __args#2=@0xffbc5a8: 0xffbc780)
    

  49.     at /home/zukeqiang/src/qnx/qnx710_host/target/qnx7/usr/include/c++/v1/__functional_base:349
    

  50. #8  0x00000000780330e8 in std::__1::__function::__alloc_func<std::__1::__bind<void (nobo::infra::em::EMCommProxy::*)(unsigned int, CFdbMessage*), nobo::infra::em::EMCommProxy*, std::__1::placeholders::__ph<1> const&, std::__1::placeholders::__ph<2> const&>, std::__1::allocator<std::__1::__bind<void (nobo::infra::em::EMCommProxy::*)(unsigned int, CFdbMessage*), nobo::infra::em::EMCommProxy*, std::__1::placeholders::__ph<1> const&, std::__1::placeholders::__ph<2> const&> >, void (unsigned int, CFdbMessage*)>::operator()(unsigned int&&, CFdbMessage*&&) (__arg#1=@0xffbc5a8: 0xffbc780, __arg#0=@0xffbc5b4: 65535, this=0x110d7b70)
    

  51.     at /home/zukeqiang/src/qnx/qnx710_host/target/qnx7/usr/include/c++/v1/functional:1527
    

  52. --Type <RET> for more, q to quit, c to continue without paging--
    

  53. #9  std::__1::__function::__policy_invoker<void (unsigned int, CFdbMessage*)>::__call_impl<std::__1::__function::__alloc_func<std::__1::__bind<void (nobo::infra::em::EMCommProxy::*)(unsigned int, CFdbMessage*), nobo::infra::em::EMCommProxy*, std::__1::placeholders::__ph<1> const&, std::__1::placeholders::__ph<2> const&>, std::__1::allocator<std::__1::__bind<void (nobo::infra::em::EMCommProxy::*)(unsigned int, CFdbMessage*), nobo::infra::em::EMCommProxy*, std::__1::placeholders::__ph<1> const&, std::__1::placeholders::__ph<2> const&> >, void (unsigned int, CFdbMessage*)> >(std::__1::__function::__policy_storage const*, unsigned int, CFdbMessage*) (__buf=0x110d30c0, __args#0=65535, __args#1=0xffbc780)
    

  54.     at /home/zukeqiang/src/qnx/qnx710_host/target/qnx7/usr/include/c++/v1/functional:2010
    

  55. #10 0x000000007803af60 in std::__1::__function::__policy_func<void (unsigned int, CFdbMessage*)>::operator()(unsigned int&&, CFdbMessage*&&) const (__args#1=@0xffbc628: 0xffbc780, __args#0=@0xffbc634: 65535, this=0x110d30c0)
    

  56.     at /home/zukeqiang/src/qnx/qnx710_host/target/qnx7/usr/include/c++/v1/functional:2123
    

  57. #11 std::__1::function<void (unsigned int, CFdbMessage*)>::operator()(unsigned int, CFdbMessage*) const (this=0x110d30c0,
    

  58.     __arg#0=65535, __arg#1=0xffbc780) at /home/zukeqiang/src/qnx/qnx710_host/target/qnx7/usr/include/c++/v1/functional:2347
    

  59. #12 0x0000000078038ecc in nobo::infra::em::FdbusCommProxy::onOnline (this=0x110d2f68, sid=1, is_first=true)
    

  60.     at /home/zukeqiang/src/basic_service/EM/src/EMCommAPI/FdbusCommProxy.cpp:37
    

  61. #13 0x00000000788887a8 in ?? ()
    

  62. Backtrace stopped: previous frame identical to this frame (corrupt stack?)
    

  63. (gdb)
此时可以看到大部分栈的信息了，找不到符号的提示也不见了。

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keer_zu
有进展了，继续努力，再接再厉  发表于 2023-2-13 18:21
 楼主| keer_zu 发表于 2023-2-14 13:26 | 显示全部楼层
有了这个相对完整的栈，对着代码从栈顶开始看。
首先
复制
  1. FdbusCommProxy.cpp:37
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 楼主| keer_zu 发表于 2023-2-14 13:30 | 显示全部楼层
第37行：
4240863eb1be08b771.png


这个回调是类的private成员：
6988663eb1c0c3dc56.png

它的类型是CommProxyCallback：
4372863eb1c6ad16c4.png


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 楼主| keer_zu 发表于 2023-2-14 13:39 | 显示全部楼层
找到初始化的地方，看看具体调用的是哪里：
1626363eb1d39cec12.png
在函数
复制
  1. ::messageCallback

中，低77行：
复制
  1. EMCommProxy.cpp:77
和栈#2对上了。这一行内容：
复制
  1. mHandler->onAlive(true);

调用的就是EMClient.cpp的::onAlive(),在这个文件的13行：
复制
  1. EMClient.cpp:13
内容是：
复制
  1. mClient->mPrint(...)
到这里我应该知道是怎么回事了，八成应该是mPrint没初始化，为空。
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