SEGFAULT with MM HEAD when probing

Bjørn Mork bjorn at
Wed Apr 21 19:33:19 UTC 2021

Aleksander Morgado <aleksander at> writes:

>> > Guess I have to figure out how to build this with a few more symbols and
>> > running gdb.
>> OK, so now I have:
>> [6596]: <debug> [1619029470.853036] [ttyUSB0/qcdm] opening serial port...
>> [6596]: <debug> [1619029470.854109] [ttyUSB0/qcdm] device open count is 1 (open)
>> [6596]: <debug> [1619029470.854688] [cdc-wdm0/probe] probing QMI...
>> Thread 1 "ModemManager" received signal SIGSEGV, Segmentation fault.
>> 0x77a7310f in install_property_internal () from /usr/lib/
>> (gdb) bt
>> #0  0x77a7310f in install_property_internal () from /usr/lib/
>> #1  0x77a731db in validate_and_install_class_property () from /usr/lib/
>> Backtrace stopped: frame did not save the PC
> Any chance you can try with the same device on a PC under valgrind? It
> looks like a memory issue.

Nope, sorry.  It's a LGA modem soldered to the MIPS main board.  So
that's a no-go.  But it is pretty similary to the RM50xQ devices if
anyone has one of those.  I don't, unfortunately.

Bu can't I just run valgrind on the MIPS CPU?  Any hints on how to use
valgrind?  It's one of those tools I've been thing that I should
explore, but never have..

Or give me a few days and I might be able to bisect the problem.


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