On Thu, 23 Jan 2020, Thorsten Glaser wrote:

> I’ve just upgraded my system (Debian sid) and now cannot use iceweasel
> any more — after I start it and select the profile to use, it crashes;

This is reproducible on two machines, both amd64.

Incidentally, downgrading just the firefox-esr package does NOT fix it ⚠

According to strace, one of the processes that result from clone gets SIGSEGV.

A not very useful backtrace, I need to install the symbols, is:

(gdb) bt
#0  0x00007fffeef69df0 in ?? () from /usr/lib/firefox-esr/libxul.so
#1  0x00007fffeef6dbe0 in ?? () from /usr/lib/firefox-esr/libxul.so
#2  0x00007fffeda1fa42 in ?? () from /usr/lib/x86_64-linux-gnu/libsqlite3.so.0
#3  0x00007fffeda1fb8f in ?? () from /usr/lib/x86_64-linux-gnu/libsqlite3.so.0
#4  0x00007fffeda65650 in ?? () from /usr/lib/x86_64-linux-gnu/libsqlite3.so.0
#5  0x00007fffeda99851 in ?? () from /usr/lib/x86_64-linux-gnu/libsqlite3.so.0
#6  0x00007fffeda99a1c in ?? () from /usr/lib/x86_64-linux-gnu/libsqlite3.so.0
#7  0x00007fffeda99a5f in ?? () from /usr/lib/x86_64-linux-gnu/libsqlite3.so.0
#8  0x00007fffedaa7075 in ?? () from /usr/lib/x86_64-linux-gnu/libsqlite3.so.0
#9  0x00007fffedaa95f7 in ?? () from /usr/lib/x86_64-linux-gnu/libsqlite3.so.0
#10 0x00007fffedaae493 in ?? () from /usr/lib/x86_64-linux-gnu/libsqlite3.so.0
#11 0x00007fffedaae82f in ?? () from /usr/lib/x86_64-linux-gnu/libsqlite3.so.0
#12 0x00007fffedaae926 in sqlite3_prepare_v2 () from 
/usr/lib/x86_64-linux-gnu/libsqlite3.so.0
#13 0x00007fffeda98ecc in sqlite3_exec () from 
/usr/lib/x86_64-linux-gnu/libsqlite3.so.0
#14 0x00007fffeef659b7 in ?? () from /usr/lib/firefox-esr/libxul.so
#15 0x00007fffeef65f24 in ?? () from /usr/lib/firefox-esr/libxul.so
#16 0x00007fffeef667f3 in ?? () from /usr/lib/firefox-esr/libxul.so
#17 0x00007fffeef77109 in ?? () from /usr/lib/firefox-esr/libxul.so
#18 0x00007fffee8218da in ?? () from /usr/lib/firefox-esr/libxul.so
#19 0x00007fffee8232a9 in ?? () from /usr/lib/firefox-esr/libxul.so
#20 0x00007fffee73b60b in ?? () from /usr/lib/firefox-esr/libxul.so
#21 0x00007fffee73db38 in ?? () from /usr/lib/firefox-esr/libxul.so
#22 0x00007fffeebe535a in ?? () from /usr/lib/firefox-esr/libxul.so
#23 0x00007fffeebb9045 in ?? () from /usr/lib/firefox-esr/libxul.so
#24 0x00007fffee73dddf in ?? () from /usr/lib/firefox-esr/libxul.so
#25 0x00007ffff7a49e08 in ?? () from /usr/lib/x86_64-linux-gnu/libnspr4.so
#26 0x00007ffff7f91fb7 in start_thread (arg=<optimized out>) at 
pthread_create.c:486
#27 0x00007ffff7cca2cf in clone () at 
../sysdeps/unix/sysv/linux/x86_64/clone.S:95
(gdb)

But this gives me some idea as to the culprit…

bye,
//mirabilos
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