My emacs 25.1 is crashing these days every 3 hours, irrelevant if Im on my laptop or work computer, and if Im programming in C or Clojure. Im always using Fedora, and I install emacs either by compiling from sources or installed from dnf. Just a paste of my last gdb crash backtrace: https://www.refheap.com/124399 Crashes are on my computer more likely when saveing or simply using the cursor around a document. I have aggressive indent mode enabled, haven't ruled that out yet. Looks to me still that something is not right in intervals.c? Thanks for all feedback, hope I don't have to downgrade my emacs. Best, Hlödver (the beginning of the trace) Thread 1 "emacs" received signal SIGSEGV, Segmentation fault. 0x00000000005a0937 in balance_an_interval (i=0x685d630) at intervals.c:443 443 + RIGHT_TOTAL_LENGTH (i->left) - LEFT_TOTAL_LENGTH (i->left); (gdb) bt #0 0x00000000005a0937 in balance_an_interval (i=0x685d630) at intervals.c:443 #1 0x00000000005a0ba5 in balance_possible_root_interval (interval=) at intervals.c:482 #2 0x00000000005a1749 in find_interval (tree=, position=0) at intervals.c:673 #3 0x00000000005a4d8e in validate_interval_range (object=, begin=begin@entry=0x7fffffff0028, end=end@entry=0x7fffffff0028, force=force@entry=false) at textprop.c:192 #4 0x00000000005a4ffb in Ftext_properties_at (position=, position@entry=2, object=, object@entry=34216612) at textprop.c:568 #5 0x00000000005a506c in Fget_text_property (position=position@entry=2, prop=prop@entry=20256, object=object@entry=34216612) at textprop.c:588 #6 0x00000000004b750c in face_at_string_position (w=, string=34216612, pos=, bufpos=bufpos@entry=11967, endptr=endptr@entry=0x7fffffff0158, base_face_id=22, mouse_p=false) at xfaces.c:6081 #7 0x000000000043e33e in handle_face_prop (it=0x7fffffff61e0) at xdisp.c:3974 #8 0x000000000043b8da in handle_stop (it=it@entry=0x7fffffff61e0) at xdisp.c:3371