Hello and thank you for this bug report!
What did you do just before the crash? Just starting the dock for the
first time? Or did you remove icons/docks?
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Bugs, which is
I'm not so sure that this crash is due to the dock.
@fabounet and Mesa devs: any idea?
#3 0x7fcb610bd5e6 in malloc_printerr (ptr=optimized out,
str=0x7fcb611bfd48 free(): invalid next size (fast), action=1) at
malloc.c:4996
buf = 02a15c60
cp = optimized out
#4