> > MM shouldn't write to any file, apart from the log file if you used > > --log-file=[PATH]. > > MM does read from several files in the filesystem, but that shouldn't > > be an issue unless your system is limiting access to certain paths > > only. Is this the case? > > That is the case, and the point. During shutdown, various parts of > the system go away, certainly /dev, /sys, /overlay, /tmp. The problem > might not be a file, it might be a device or socket. I'm just trying > to give some clues as to where to look. > > Here's lsof: > > 3714 /usr/sbin/ModemManager 0 /dev/null > 3714 /usr/sbin/ModemManager 1 /dev/null > 3714 /usr/sbin/ModemManager 2 /dev/null > 3714 /usr/sbin/ModemManager 3 anon_inode:[eventfd] > 3714 /usr/sbin/ModemManager 4 anon_inode:[eventfd] > 3714 /usr/sbin/ModemManager 5 socket:[19212] > 3714 /usr/sbin/ModemManager 6 anon_inode:[eventfd] > 3714 /usr/sbin/ModemManager 7 socket:[1058312] > 3714 /usr/sbin/ModemManager 8 /dev/ttyUSB3 > 3714 /usr/sbin/ModemManager 9 /dev/ttyUSB0 > 3714 /usr/sbin/ModemManager 11 /dev/ttyUSB2 > > > Looking at the error it does look like a NULL pointer dereference of > > some sort. Does the system generate core files, and if so, could we > > debug one with gdb to get a full backtrace of where the issue > > happened? > > My previous experiments with gdb show it to run far too slowly for > ModemManager > to operate correctly - various timeouts kick in, and it doesn't want to > connect. >
I was suggesting to enable dumping core files on SEGFAULT, so that they can be later on analyzed by gdb (without running MM under gdb) > Unfortunately, I'm not in a position to investigate this much more this week - > my current work involves rapid turn around of images, and I'm doing things > with overlay, during which I noticed this as well, although that might just > be coincidence. > > I realize this could well be a libglib problem too. > Yep, it could be. In theory /dev devices going away shouldn't be an issue, that already happens on e.g. unplugging a USB device. -- Aleksander
