3rd-party/linux-kernel-module-cheat
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Document ARM kernel module step debugging is broken

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Ciro Santilli
2018-02-22 10:12:06 +00:00
parent 6420c31986
commit cd34810607
1 changed files with 19 additions and 0 deletions
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README.adoc
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@@ -871,6 +871,25 @@ TODOs:
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pkill qemu
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* GDB step debugging of kernel modules broke at some point. This was noticed at 6420c31986e064c81561da8f2be0bd33483af598 and a likely candidate was the recent move to kernel v4.15, but this has to be bisected.
+
Just afte GDB connects, we get the following message from the kernel GDB Python scripts:
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loading vmlinux
Traceback (most recent call last):
File "/home/ciro/bak/git/linux-kernel-module-cheat/buildroot/output.arm~/build/linux-custom/scripts/gdb/linux/symbols.py", line 163, in invoke
self.load_all_symbols()
File "/home/ciro/bak/git/linux-kernel-module-cheat/buildroot/output.arm~/build/linux-custom/scripts/gdb/linux/symbols.py", line 150, in load_all_symbols
[self.load_module_symbols(module) for module in module_list]
File "/home/ciro/bak/git/linux-kernel-module-cheat/buildroot/output.arm~/build/linux-custom/scripts/gdb/linux/symbols.py", line 110, in load_module_symbols
module_name = module['name'].string()
File "/home/ciro/bak/git/linux-kernel-module-cheat/buildroot/output.arm~/host/lib/python2.7/encodings/utf_8.py", line 16, in decode
return codecs.utf_8_decode(input, errors, True)
UnicodeDecodeError: 'utf8' codec can't decode byte 0x9f in position 2: invalid start byte
Error occurred in Python command: 'utf8' codec can't decode byte 0x9f in position 2: invalid start byte
....
+
and then after inserting the module, symbols are not found, presumably because `lx-symbols` never ran.
==== aarch64