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Master segfaults on Windows XP when running gdb


From: martin rudalics
Subject: Master segfaults on Windows XP when running gdb
Date: Sun, 26 Feb 2017 09:16:13 +0100

On Windos XP today's master causes

M-x gdb RET -i=mi c:/emacs-git/trunk/dbg/src/emacs.exe RET

to segfault as follows:

Current directory is c:/emacs-git/trunk/src/
GNU gdb (GDB) 7.4
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i686-pc-mingw32".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from c:\emacs-git\trunk\dbg\src\emacs.exe...done.
SIGINT is used by the debugger.
Are you sure you want to change it? (y or n) [answered Y; input not from 
terminal]
DISPLAY = w32
TERM = emacs
(gdb) run -Q
Starting program: c:\emacs-git\trunk\dbg\src\emacs.exe -Q
[New Thread 3148.0x4a4]
warning: Enabling Low Fragmentation Heap failed: error 31
[New Thread 3148.0xe10]
[New Thread 3148.0x718]
[New Thread 3148.0x98c]
[New Thread 3148.0x878]
[New Thread 3148.0x99c]
[New Thread 3148.0xa40]
[New Thread 3148.0x3c8]
[New Thread 3148.0x598]
[New Thread 3148.0x91c]

Program received signal SIGSEGV, Segmentation fault.
0x0114c7ae in buffer_window_count (b=0x0) at ../../src/buffer.h:1228
1228      if (b->base_buffer)
(gdb) bt
#0  0x0114c7ae in buffer_window_count (b=0x0) at ../../src/buffer.h:1228
#1  0x0102aa4c in bset_redisplay (b=0x0) at ../../src/xdisp.c:604
#2  0x0105f1b0 in overlay_arrows_changed_p (set_redisplay=true) at 
../../src/xdisp.c:13361
#3  0x01060b30 in redisplay_internal () at ../../src/xdisp.c:13791
#4  0x0106298f in redisplay_preserve_echo_area (from_where=2) at 
../../src/xdisp.c:14389
#5  0x01010b90 in Fredisplay (force=...) at ../../src/dispnew.c:5792
#6  0x01227c0e in funcall_subr (subr=0x1363100, numargs=0, args=0x82e068) at 
../../src/eval.c:2840
#7  0x012276a4 in Ffuncall (nargs=1, args=0x82e060) at ../../src/eval.c:2765
#8  0x012860e3 in exec_byte_code (bytestr=..., vector=..., maxdepth=..., 
args_template=..., nargs=1, args=0x82e590) at ../../src/bytecode.c:641
#9  0x012286c8 in funcall_lambda (fun=..., nargs=1, arg_vector=0x82e588) at 
../../src/eval.c:2965
#10 0x012276e8 in Ffuncall (nargs=2, args=0x82e580) at ../../src/eval.c:2767
#11 0x012860e3 in exec_byte_code (bytestr=..., vector=..., maxdepth=..., 
args_template=..., nargs=3, args=0x82ecc8) at ../../src/bytecode.c:641
#12 0x012286c8 in funcall_lambda (fun=..., nargs=3, arg_vector=0x82ecb0) at 
../../src/eval.c:2965
#13 0x012276e8 in Ffuncall (nargs=4, args=0x82eca8) at ../../src/eval.c:2767
#14 0x01219667 in Ffuncall_interactively (nargs=4, args=0x82eca8) at 
../../src/callint.c:252
#15 0x01227b31 in funcall_subr (subr=0x1665200, numargs=4, args=0x82eca8) at 
../../src/eval.c:2820
#16 0x012276a4 in Ffuncall (nargs=5, args=0x82eca0) at ../../src/eval.c:2765
#17 0x0122646b in Fapply (nargs=3, args=0x82efb0) at ../../src/eval.c:2396
#18 0x01219e43 in Fcall_interactively (function=..., record_flag=..., keys=...) 
at ../../src/callint.c:389
#19 0x01227c7f in funcall_subr (subr=0x1665220, numargs=3, args=0x82f1e0) at 
../../src/eval.c:2845
#20 0x012276a4 in Ffuncall (nargs=4, args=0x82f1d8) at ../../src/eval.c:2765
#21 0x012860e3 in exec_byte_code (bytestr=..., vector=..., maxdepth=..., 
args_template=..., nargs=1, args=0x82f740) at ../../src/bytecode.c:641
#22 0x012286c8 in funcall_lambda (fun=..., nargs=1, arg_vector=0x82f738) at 
../../src/eval.c:2965
#23 0x012276e8 in Ffuncall (nargs=2, args=0x82f730) at ../../src/eval.c:2767
#24 0x01226d35 in call1 (fn=..., arg1=...) at ../../src/eval.c:2627
#25 0x011543aa in command_loop_1 () at ../../src/keyboard.c:1484
#26 0x01221f56 in internal_condition_case (bfun=0x1153928 <command_loop_1>, 
handlers=..., hfun=0x1152bc0 <cmd_error>) at ../../src/eval.c:1324
#27 0x011533c2 in command_loop_2 (ignore=...) at ../../src/keyboard.c:1112
#28 0x0122109e in internal_catch (tag=..., func=0x1153386 <command_loop_2>, 
arg=...) at ../../src/eval.c:1091
#29 0x01153348 in command_loop () at ../../src/keyboard.c:1091
#30 0x011525fc in recursive_edit_1 () at ../../src/keyboard.c:697
#31 0x01152895 in Frecursive_edit () at ../../src/keyboard.c:768
#32 0x0114ff93 in main (argc=2, argv=0xa32658) at ../../src/emacs.c:1688

Lisp Backtrace:
"redisplay_internal (C function)" (0x0)
"redisplay" (0x82e068)
"sit-for" (0x82e588)
"execute-extended-command" (0x82ecb0)
"funcall-interactively" (0x82eca8)
"call-interactively" (0x82f1e0)
"command-execute" (0x82f738)
(gdb)

martin



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