(gdb) c
Continuing.

Thread 1 "emacs" hit Breakpoint 4, text_read_only (
    propval=propval@entry=XIL(0xb010)) at ../../src/textprop.c:71
71	  if (STRINGP (propval))
(gdb) bt
#0  text_read_only (propval=propval@entry=XIL(0xb010))
    at ../../src/textprop.c:71
#1  0x00000000005bd8da in verify_interval_modification (buf=<optimized out>, 
    start=start@entry=3209, end=end@entry=3209) at ../../src/textprop.c:2192
#2  0x0000000000519353 in prepare_to_modify_buffer_1 (start=start@entry=3209, 
    end=end@entry=3209, preserve_ptr=preserve_ptr@entry=0x0)
    at ../../src/insdel.c:1837
#3  0x0000000000519791 in prepare_to_modify_buffer (start=3209, end=3209, 
    preserve_ptr=preserve_ptr@entry=0x0) at ../../src/insdel.c:1878
#4  0x00000000005199b1 in insert_1_both (
    string=string@entry=0x7ffd5642bca0 "\n\037\344\004", 
    nchars=nchars@entry=1, nbytes=nbytes@entry=1, inherit=inherit@entry=false, 
    prepare=prepare@entry=true, before_markers=before_markers@entry=false)
    at ../../src/insdel.c:801
#5  0x0000000000519ff1 in insert_1_both (before_markers=false, prepare=true, 
    inherit=false, nbytes=1, nchars=1, string=0x7ffd5642bca0 "\n\037\344\004")
    at ../../src/insdel.c:585
#6  insert (string=0x7ffd5642bca0 "\n\037\344\004", nbytes=1)
    at ../../src/insdel.c:582
#7  0x00000000005582fc in general_insert_function (
    insert_func=0x51a000 <insert>, 
    insert_from_string_func=0x51a2f0 <insert_from_string>, 
    inherit=inherit@entry=false, nargs=2, args=args@entry=0x7ffd5642bd40)
---Type <return> to continue, or q <return> to quit---
   ../src/editfns.c:2492
#8  0x00000000005583cf in Finsert (nargs=<optimized out>, 
    args=args@entry=0x7ffd5642bd40) at ../../src/editfns.c:2532
#9  0x000000000059fed4 in exec_byte_code (bytestr=<optimized out>, 
    vector=<optimized out>, maxdepth=<optimized out>, 
    args_template=<optimized out>, nargs=nargs@entry=0, args=<optimized out>, 
    args@entry=0x45800b4) at ../../src/bytecode.c:1517
#10 0x0000000000566416 in funcall_lambda (fun=XIL(0x7ffd5642c090), 
    nargs=nargs@entry=0, arg_vector=0x45800b4, arg_vector@entry=0x7ffd5642bf38)
    at ../../src/eval.c:2863
#11 0x00000000005666db in Ffuncall (nargs=1, args=0x7ffd5642bf30)
    at ../../src/eval.c:2760
#12 0x0000000000566939 in funcall_nil (nargs=<optimized out>, 
    args=<optimized out>) at ../../src/eval.c:2338
#13 0x0000000000564a55 in run_hook_with_args (nargs=1, args=0x7ffd5642bf30, 
    funcall=0x566930 <funcall_nil>) at ../../src/eval.c:2515
#14 0x0000000000564c33 in run_hook_with_args (funcall=<optimized out>, 
    args=<optimized out>, nargs=<optimized out>) at ../../src/eval.c:2361
#15 Frun_hook_with_args (args=0x7ffd5642bf30, nargs=1) at ../../src/eval.c:2380
#16 run_hook (hook=<optimized out>) at ../../src/eval.c:2528
#17 Frun_hooks (nargs=1, args=0x7ffd5642c020) at ../../src/eval.c:2362
#18 0x00000000005667e9 in Ffuncall (nargs=2, args=args@entry=0x7ffd5642c018)
    at ../../src/eval.c:2679
---Type <return> to continue, or q <return> to quit---
#19 0x000000000059f173 in exec_byte_code (bytestr=<optimized out>, 
    vector=<optimized out>, maxdepth=<optimized out>, 
    args_template=<optimized out>, nargs=nargs@entry=0, args=<optimized out>, 
    args@entry=0x343c164) at ../../src/bytecode.c:880
#20 0x0000000000566416 in funcall_lambda (fun=XIL(0x7ffd5642c6f0), 
    nargs=nargs@entry=0, arg_vector=0x343c164, arg_vector@entry=0x7ffd5642c200)
    at ../../src/eval.c:2863
#21 0x00000000005666db in Ffuncall (nargs=1, args=0x7ffd5642c1f8)
    at ../../src/eval.c:2760
#22 0x0000000000566939 in funcall_nil (nargs=<optimized out>, 
    args=<optimized out>) at ../../src/eval.c:2338
#23 0x0000000000564a55 in run_hook_with_args (nargs=1, args=0x7ffd5642c1f8, 
    funcall=0x566930 <funcall_nil>) at ../../src/eval.c:2515
#24 0x0000000000565259 in run_hook_with_args (funcall=<optimized out>, 
    args=<optimized out>, nargs=<optimized out>) at ../../src/eval.c:2465
#25 Frun_hook_with_args (args=0x7ffd5642c1f8, nargs=1) at ../../src/eval.c:2380
#26 run_hook (hook=<optimized out>, hook@entry=XIL(0x7530))
    at ../../src/eval.c:2528
#27 0x0000000000511aa1 in Fkill_buffer (buffer_or_name=<optimized out>)
    at ../../src/buffer.c:1680
#28 0x00000000005668e0 in Ffuncall (nargs=nargs@entry=2, 
    args=args@entry=0x7ffd5642c3f8) at ../../src/eval.c:2699
#29 0x00000000005622da in Ffuncall_interactively (nargs=2, args=0x7ffd5642c3f8)
---Type <return> to continue, or q <return> to quit---
    at ../../src/callint.c:252
#30 0x00000000005667e9 in Ffuncall (nargs=nargs@entry=3, 
    args=args@entry=0x7ffd5642c3f0) at ../../src/eval.c:2679
#31 0x0000000000562cb6 in Fcall_interactively (function=<optimized out>, 
    record_flag=<optimized out>, keys=<optimized out>)
    at ../../src/callint.c:843
#32 0x00000000005668c6 in Ffuncall (nargs=4, args=args@entry=0x7ffd5642c658)
    at ../../src/eval.c:2706
#33 0x000000000059f173 in exec_byte_code (bytestr=<optimized out>, 
    vector=<optimized out>, maxdepth=<optimized out>, 
    args_template=<optimized out>, nargs=nargs@entry=1, args=<optimized out>, 
    args@entry=0x9394d4 <pure+895540>) at ../../src/bytecode.c:880
#34 0x0000000000566416 in funcall_lambda (fun=XIL(0), nargs=nargs@entry=1, 
    arg_vector=0x9394d4 <pure+895540>, arg_vector@entry=0x7ffd5642c808)
    at ../../src/eval.c:2863
#35 0x00000000005666db in Ffuncall (nargs=nargs@entry=2, 
    args=args@entry=0x7ffd5642c800) at ../../src/eval.c:2760
#36 0x00000000005669da in call1 (fn=fn@entry=XIL(0x3a50), arg1=<optimized out>)
    at ../../src/eval.c:2558
#37 0x0000000000500461 in command_loop_1 () at ../../src/keyboard.c:1484
#38 0x0000000000565002 in internal_condition_case (
    bfun=bfun@entry=0x500040 <command_loop_1>, 
    handlers=handlers@entry=XIL(0x4b00), hfun=hfun@entry=0x4f68c0 <cmd_error>)
---Type <return> to continue, or q <return> to quit---
    at ../../src/eval.c:1315
#39 0x00000000004f1cf4 in command_loop_2 (ignore=ignore@entry=XIL(0))
    at ../../src/keyboard.c:1112
#40 0x0000000000564fa3 in internal_catch (tag=tag@entry=XIL(0xb580), 
    func=func@entry=0x4f1cd0 <command_loop_2>, arg=arg@entry=XIL(0))
    at ../../src/eval.c:1080
#41 0x00000000004f1cb0 in command_loop () at ../../src/keyboard.c:1091
#42 0x00000000004f64b7 in recursive_edit_1 () at ../../src/keyboard.c:697
#43 0x00000000004f6808 in Frecursive_edit () at ../../src/keyboard.c:768
#44 0x000000000041a032 in main (argc=1, argv=0x7ffd5642cc08)
    at ../../src/emacs.c:1629

Lisp Backtrace:
"eshell-write-history" (0x5642bf38)
"run-hooks" (0x5642c020)
"eshell-kill-buffer-function" (0x5642c200)
"kill-buffer" (0x5642c400)
"funcall-interactively" (0x5642c3f8)
"call-interactively" (0x5642c660)
"command-execute" (0x5642c808)
(gdb)