search

rainers / cv2pdb

converter of DMD CodeView/DWARF debug information to PDB files
Artistic License 2.0
472 stars 109 forks source link

Crash during convertion of specific executable #23

Closed varosi-chaosgroup closed 6 years ago

varosi-chaosgroup commented 6 years ago

On Windows 10 when trying to convert this executable: https://drive.google.com/open?id=1rLnF0UIa1ympra9U7zCQWmQpH0PaxpBD

cv2pdb crashes. We're using latest tool from the Release section.

rainers commented 6 years ago

The download is behind some login. Could you make it available elsewhere?

varosi commented 6 years ago

Any Google log-in is enough. hm, I have fixed rights of the file. Please, try again.

rainers commented 6 years ago

This time I could download without a login.

For me it seems to get stuck inside an endless loop, that might result in a out-of-memory error after some time.

I ran objdump on it and it reported some warnings which might be related:

c:\tmp\cv\crash>C:\l\d\GDC-2.068\bin\x86_64-unknown-linux-gnu-objdump.exe -W crash.exe >objdump
C:\l\d\GDC-2.068\bin\x86_64-unknown-linux-gnu-objdump.exe: Warning: Encoded value extends past end of section
C:\l\d\GDC-2.068\bin\x86_64-unknown-linux-gnu-objdump.exe: Warning: Encoded value extends past end of section
C:\l\d\GDC-2.068\bin\x86_64-unknown-linux-gnu-objdump.exe: Warning: Encoded value extends past end of section
C:\l\d\GDC-2.068\bin\x86_64-unknown-linux-gnu-objdump.exe: Warning: Encoded value extends past end of section
C:\l\d\GDC-2.068\bin\x86_64-unknown-linux-gnu-objdump.exe: Warning: Encoded value extends past end of section
C:\l\d\GDC-2.068\bin\x86_64-unknown-linux-gnu-objdump.exe: Warning: Encoded value extends past end of section
C:\l\d\GDC-2.068\bin\x86_64-unknown-linux-gnu-objdump.exe: Warning: Encoded value extends past end of section
C:\l\d\GDC-2.068\bin\x86_64-unknown-linux-gnu-objdump.exe: Warning: Encoded value extends past end of section
C:\l\d\GDC-2.068\bin\x86_64-unknown-linux-gnu-objdump.exe: Warning: Encoded value extends past end of section
C:\l\d\GDC-2.068\bin\x86_64-unknown-linux-gnu-objdump.exe: Warning: Encoded value extends past end of section
C:\l\d\GDC-2.068\bin\x86_64-unknown-linux-gnu-objdump.exe: Warning: Encoded value extends past end of section
C:\l\d\GDC-2.068\bin\x86_64-unknown-linux-gnu-objdump.exe: Warning: Encoded value extends past end of section
C:\l\d\GDC-2.068\bin\x86_64-unknown-linux-gnu-objdump.exe: Warning: Encoded value extends past end of section
C:\l\d\GDC-2.068\bin\x86_64-unknown-linux-gnu-objdump.exe: Warning: Encoded value extends past end of section
C:\l\d\GDC-2.068\bin\x86_64-unknown-linux-gnu-objdump.exe: Warning: Encoded value extends past end of section
C:\l\d\GDC-2.068\bin\x86_64-unknown-linux-gnu-objdump.exe: Warning: Encoded value extends past end of section
C:\l\d\GDC-2.068\bin\x86_64-unknown-linux-gnu-objdump.exe: Warning: Encoded value extends past end of section
C:\l\d\GDC-2.068\bin\x86_64-unknown-linux-gnu-objdump.exe: Warning: Encoded value extends past end of section
C:\l\d\GDC-2.068\bin\x86_64-unknown-linux-gnu-objdump.exe: Warning: Encoded value extends past end of section
C:\l\d\GDC-2.068\bin\x86_64-unknown-linux-gnu-objdump.exe: Warning: Encoded value extends past end of section
C:\l\d\GDC-2.068\bin\x86_64-unknown-linux-gnu-objdump.exe: Warning: Encoded value extends past end of section
C:\l\d\GDC-2.068\bin\x86_64-unknown-linux-gnu-objdump.exe: Warning: Encoded value extends past end of section
C:\l\d\GDC-2.068\bin\x86_64-unknown-linux-gnu-objdump.exe: Warning: Encoded value extends past end of section
C:\l\d\GDC-2.068\bin\x86_64-unknown-linux-gnu-objdump.exe: Warning: Encoded value extends past end of section
C:\l\d\GDC-2.068\bin\x86_64-unknown-linux-gnu-objdump.exe: Warning: Encoded value extends past end of section
C:\l\d\GDC-2.068\bin\x86_64-unknown-linux-gnu-objdump.exe: Warning: Encoded value extends past end of section
C:\l\d\GDC-2.068\bin\x86_64-unknown-linux-gnu-objdump.exe: Warning: Encoded value extends past end of section
C:\l\d\GDC-2.068\bin\x86_64-unknown-linux-gnu-objdump.exe: Warning: Encoded value extends past end of section
C:\l\d\GDC-2.068\bin\x86_64-unknown-linux-gnu-objdump.exe: Warning: Encoded value extends past end of section
C:\l\d\GDC-2.068\bin\x86_64-unknown-linux-gnu-objdump.exe: Warning: Encoded value extends past end of section
C:\l\d\GDC-2.068\bin\x86_64-unknown-linux-gnu-objdump.exe: Warning: Encoded value extends past end of section
C:\l\d\GDC-2.068\bin\x86_64-unknown-linux-gnu-objdump.exe: Warning: Encoded value extends past end of section
C:\l\d\GDC-2.068\bin\x86_64-unknown-linux-gnu-objdump.exe: Warning: Encoded value extends past end of section
C:\l\d\GDC-2.068\bin\x86_64-unknown-linux-gnu-objdump.exe: Warning: There is a hole [0x682a - 0x6867] in .debug_loc section.

Unfortunately it doesn't give a hint where the warnings occur. How did you create this exe?

varosi-chaosgroup commented 6 years ago

File is compiled with GHC 8.2.2, linked with ld 2.27 under Mingw64 (Windows 10). Then signed with a certificate.

varosi-chaosgroup commented 6 years ago

I tryed same build but without signing and it's still crashing and giving the same warnings. Is that a problem with the compiler or linker? It would be useful if cv2pdb is more resilient to such problems and overcome if possible crashes.

varosi-chaosgroup commented 6 years ago

Is it possible to handle cyclic structures and get out with any debug information gracefully?

rainers commented 6 years ago

https://github.com/rainers/cv2pdb/commit/a76c08cdbecf7a20f7f486de724e720a8f012bdd should fix the crash, but it still took more than 10 minutes to run the conversion on that file. I suspect this is caused by deep nesting of lexical scopes in the debug information. Please try the new release build.

varosi-chaosgroup commented 6 years ago

Great! It does not crash now! Thanks a lot!

May be in some future version it could get some progress indication. But this is not so important. It works now and finish the work fine!