Ah, bug 718365 is indeed a different kind, thanks for pointing this out!
There, the retraced stack trace breaks at "Unhandled dwarf expression
opcode 0x9f"; the reason likely is that this would require a newer gdb
than we have installed in our retracer chroots. Unfortunately newer gdbs
act up on the retracers, so it's not easy to update them.
However, it should at least keep the core dump in this case, and not
duplicate bugs on just the short and broken one (which is just an assert
failure, probably even from gdb itself). I'll update the stack unwinding
logic to include this case as well (which should result in an empty
stack trace top), this will then count as a failed retrace, and the bot
will keep the core dump attachment. As a second step, I'll try to update
the retracer chroots.
** Also affects: apport
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/705572
Title:
retracer attaching incomplete backtrace
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