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Hi Dchen :)

Is this bug still reproducible in Fedora 23?  If not lets close else move to Fedora 23.

I reproduced it on Fedora 23:

#0  0x00007fda1d765190 in _gtk_text_btree_get_chars_changed_stamp (tree=0x1) at gtktextbtree.c:543
#1  0x00007fda1d77e424 in gtk_text_iter_make_surreal (_iter=0x7ffcb8640610) at gtktextiter.c:173
#2  0x00007fda1d780743 in gtk_text_iter_is_end (iter=iter@entry=0x7ffcb8640610) at gtktextiter.c:1604
#3  0x00007fda1e019f3b in smart_forward_search_async (wrapped_around=<synthetic pointer>, start_at=0x7ffcb8640610, search=0x555f25eef660 [GtkSourceSearchContext])
    at gtksourcesearchcontext.c:1016
#4  0x00007fda1e019f3b in smart_forward_search_async (search=search@entry=0x555f25eef660 [GtkSourceSearchContext], start_at=start_at@entry=0x7ffcb8640840, wrapped_around=wrapped_around@entry=0) at gtksourcesearchcontext.c:1133
#5  0x00007fda1e01e87b in gtk_source_search_context_forward_async (search=search@entry=0x555f25eef660 [GtkSourceSearchContext], iter=iter@entry=0x7ffcb8640840, cancellable=cancellable@entry=0x0, callback=callback@entry=0x7fda1e93c300 <start_search_finished>, user_data=user_data@entry=0x555f25ce7130) at gtksourcesearchcontext.c:3364
#6  0x00007fda1e93be5f in start_search (frame=frame@entry=0x555f25ce7130 [GeditViewFrame]) at gedit/gedit-view-frame.c:359
#7  0x00007fda1e93d181 in search_entry_changed_cb (entry=<optimized out>, frame=0x555f25ce7130 [GeditViewFrame]) at gedit/gedit-view-frame.c:1129
#11 0x00007fda1b4cedc5 in <emit signal 0x7fda1d8861b8 "changed" on instance 0x555f25a964c0 [GdTaggedEntry]> (instance=instance@entry=0x555f25a964c0, detailed_signal=detailed_signal@entry=0x7fda1d8861b8 "changed") at gsignal.c:3479
    #8  0x00007fda1b4b37a5 in g_closure_invoke (closure=0x555f25d3d6e0, return_value=return_value@entry=0x0, n_param_values=1, param_values=param_values@entry=0x7ffcb8640b20, invocation_hint=invocation_hint@entry=0x7ffcb8640aa0) at gclosure.c:801
    #9  0x00007fda1b4c5851 in signal_emit_unlocked_R (node=node@entry=0x555f2572da60, detail=detail@entry=0, instance=instance@entry=0x555f25a964c0, emission_return=emission_return@entry=0x0, instance_and_params=instance_and_params@entry=0x7ffcb8640b20) at gsignal.c:3627
    #10 0x00007fda1b4ce530 in g_signal_emit_valist (instance=instance@entry=0x555f25a964c0, signal_id=signal_id@entry=254, detail=detail@entry=0, var_args=var_args@entry=0x7ffcb8640d28) at gsignal.c:3383
#12 0x00007fda1d62fb01 in end_change (entry=0x555f25a964c0 [GdTaggedEntry]) at gtkentry.c:2872
#13 0x00007fda1d633664 in gtk_entry_real_insert_text (editable=0x555f25a964c0, new_text=<optimized out>, new_text_length=<optimized out>, position=0x7ffcb8641424)
    at gtkentry.c:5317
#17 0x00007fda1b4cedc5 in <emit signal 0x7fda1d840eee "insert-text" on instance 0x555f25a964c0 [GdTaggedEntry]> (instance=instance@entry=0x555f25a964c0, detailed_signal=detailed_signal@entry=0x7fda1d840eee "insert-text") at gsignal.c:3479
    #14 0x00007fda1b4b37a5 in g_closure_invoke (closure=closure@entry=0x555f2584bc30, return_value=return_value@entry=0x0, n_param_values=4, param_values=param_values@entry=0x7ffcb8641070, invocation_hint=invocation_hint@entry=0x7ffcb8640ff0) at gclosure.c:801
    #15 0x00007fda1b4c5dfe in signal_emit_unlocked_R (node=node@entry=0x555f2572d8a0, detail=detail@entry=0, instance=instance@entry=0x555f25a964c0, emission_return=emission_return@entry=0x0, instance_and_params=instance_and_params@entry=0x7ffcb8641070) at gsignal.c:3665
    #16 0x00007fda1b4ce530 in g_signal_emit_valist (instance=instance@entry=0x555f25a964c0, signal_id=signal_id@entry=252, detail=detail@entry=0, var_args=var_args@entry=0x7ffcb86412b8) at gsignal.c:3383
#18 0x00007fda1d62dba5 in gtk_entry_insert_text (editable=0x555f25a964c0, new_text=0x555f2582a110 "找", new_text_length=3, position=0x7ffcb8641424) at gtkentry.c:5068
#19 0x00007fda1d637842 in gtk_entry_commit_cb (str=0x555f2582a110 "找", entry=0x555f25a964c0 [GdTaggedEntry]) at gtkentry.c:6046
#20 0x00007fda1d637842 in gtk_entry_commit_cb (context=<optimized out>, str=0x555f2582a110 "找", entry=0x555f25a964c0 [GdTaggedEntry]) at gtkentry.c:5962
#21 0x00007fda1b4b625a in g_cclosure_marshal_VOID__STRINGv (closure=0x555f25d52860, return_value=<optimized out>, instance=<optimized out>, args=<optimized out>, marshal_data=<optimized out>, n_params=<optimized out>, param_types=0x555f25857d80) at gmarshal.c:1794
#22 0x00007fda1b4b39d4 in _g_closure_invoke_va (closure=closure@entry=0x555f25d52860, return_value=return_value@entry=0x0, instance=instance@entry=0x555f25d3b960, args=args@entry=0x7ffcb8641728, n_params=<optimized out>, param_types=0x555f25857d80) at gclosure.c:864
#23 0x00007fda1b4ce2bd in g_signal_emit_valist (instance=instance@entry=0x555f25d3b960, signal_id=signal_id@entry=277, detail=detail@entry=0, var_args=var_args@entry=0x7ffcb8641728) at gsignal.c:3292
#24 0x00007fda1b4cedc5 in g_signal_emit_by_name (instance=0x555f25d3b960, detailed_signal=0x7fda1d867638 "commit") at gsignal.c:3479
#25 0x00007fda1b4b625a in g_cclosure_marshal_VOID__STRINGv (closure=0x555f25d7e4c0, return_value=<optimized out>, instance=<optimized out>, args=<optimized out>, marshal_data=<optimized out>, n_params=<optimized out>, param_types=0x555f25857d80) at gmarshal.c:1794
#26 0x00007fda1b4b39d4 in _g_closure_invoke_va (closure=closure@entry=0x555f25d7e4c0, return_value=return_value@entry=0x0, instance=instance@entry=0x555f25d49c70, args=args@entry=0x7ffcb8641ae0, n_params=<optimized out>, param_types=0x555f25857d80) at gclosure.c:864
#27 0x00007fda1b4ce2bd in g_signal_emit_valist (instance=0x555f25d49c70, signal_id=<optimized out>, detail=0, var_args=var_args@entry=0x7ffcb8641ae0) at gsignal.c:3292
#28 0x00007fda1b4ce8ff in g_signal_emit (instance=instance@entry=0x555f25d49c70, signal_id=<optimized out>, detail=detail@entry=0) at gsignal.c:3439
#29 0x00007fda021bfeaa in _ibus_context_commit_text_cb (ibuscontext=<optimized out>, text=<optimized out>, ibusimcontext=0x555f25d49c70 [IBusIMContext])
    at ibusimcontext.c:1193
#30 0x00007fda1b4b68a7 in g_cclosure_marshal_VOID__OBJECTv (closure=0x555f25dc94c0, return_value=<optimized out>, instance=<optimized out>, args=<optimized out>, marshal_data=0x0, n_params=<optimized out>, param_types=0x555f25da5a80) at gmarshal.c:2102
#31 0x00007fda1b4b39d4 in _g_closure_invoke_va (closure=closure@entry=0x555f25dc94c0, return_value=return_value@entry=0x0, instance=instance@entry=0x555f25c97f50, args=args@entry=0x7ffcb8641e40, n_params=<optimized out>, param_types=0x555f25da5a80) at gclosure.c:864
#32 0x00007fda1b4ce2bd in g_signal_emit_valist (instance=0x555f25c97f50, signal_id=<optimized out>, detail=0, var_args=var_args@entry=0x7ffcb8641e40) at gsignal.c:3292
#33 0x00007fda1b4ce8ff in g_signal_emit (instance=instance@entry=0x555f25c97f50, signal_id=<optimized out>, detail=<optimized out>) at gsignal.c:3439
#34 0x00007fda01f6e8b4 in ibus_input_context_g_signal (proxy=0x555f25c97f50 [IBusInputContext], sender_name=0x555f260c8be0 "org.freedesktop.IBus", signal_name=0x555f255ad250 "CommitText", parameters=0x7fd9fc021460) at ibusinputcontext.c:616
#35 0x00007fda15ff0d30 in ffi_call_unix64 () at ../src/x86/unix64.S:76
#36 0x00007fda15ff079b in ffi_call (cif=cif@entry=0x7ffcb86421a0, fn=<optimized out>, rvalue=0x7ffcb8642100, avalue=avalue@entry=0x7ffcb8642080)
    at ../src/x86/ffi64.c:525
#41 0x00007fda1b4ce8ff in <emit signal ??? on instance 0x555f25c97f50 [IBusInputContext]> (instance=instance@entry=0x555f25c97f50, signal_id=<optimized out>, detail=detail@entry=0) at gsignal.c:3439
    #37 0x00007fda1b4b3fc9 in g_cclosure_marshal_generic (closure=0x555f2556bde0, return_gvalue=0x0, n_param_values=<optimized out>, param_values=0x7ffcb86423d0, invocation_hint=<optimized out>, marshal_data=0x7fda01f6e6c0 <ibus_input_context_g_signal>) at gclosure.c:1487
    #38 0x00007fda1b4b37a5 in g_closure_invoke (closure=closure@entry=0x555f2556bde0, return_value=return_value@entry=0x0, n_param_values=4, param_values=param_values@entry=0x7ffcb86423d0, invocation_hint=invocation_hint@entry=0x7ffcb8642350) at gclosure.c:801
    #39 0x00007fda1b4c5dfe in signal_emit_unlocked_R (node=node@entry=0x555f2556be10, detail=detail@entry=0, instance=instance@entry=0x555f25c97f50, emission_return=emission_return@entry=0x0, instance_and_params=instance_and_params@entry=0x7ffcb86423d0) at gsignal.c:3665
    #40 0x00007fda1b4ce530 in g_signal_emit_valist (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>, var_args=var_args@entry=0x7ffcb86425d0) at gsignal.c:3383
#42 0x00007fda1bd46b2c in on_signal_received (connection=<optimized out>, sender_name=0x7fd9fc02ef90 "org.freedesktop.IBus", object_path=<optimized out>, interface_name=<optimized out>, signal_name=0x7fd9fc050190 "CommitText", parameters=0x7fd9fc021460, user_data=0x555f25b2f770) at gdbusproxy.c:917
#43 0x00007fda1bd36554 in emit_signal_instance_in_idle_cb (data=0x7fd9fc0079a0) at gdbusconnection.c:3701
#44 0x00007fda1b1b4e3a in g_main_context_dispatch (context=0x555f2556a430) at gmain.c:3154
#45 0x00007fda1b1b4e3a in g_main_context_dispatch (context=context@entry=0x555f2556a430) at gmain.c:3769
#46 0x00007fda1b1b51d0 in g_main_context_iterate (context=context@entry=0x555f2556a430, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>)
    at gmain.c:3840
#47 0x00007fda1b1b527c in g_main_context_iteration (context=0x555f2556a430, context@entry=0x0, may_block=may_block@entry=1) at gmain.c:3901
#48 0x00007fda1bd13a0c in g_application_run (application=0x555f25565190 [GeditAppX11], argc=1, argv=0x7ffcb8642998) at gapplication.c:2311
#49 0x0000555f23f32f1a in main (argc=1, argv=0x7ffcb8642998) at gedit/gedit.c:146


ibus-libzhuyin doesn't have this problem.

(gedit:9216): Gtk-CRITICAL **: gtk_text_buffer_get_iter_at_mark: assertion 'GTK_IS_TEXT_MARK (mark)' failed

Program received signal SIGSEGV, Segmentation fault.
_gtk_text_btree_get_chars_changed_stamp (tree=0x1) at gtktextbtree.c:543
543	  return tree->chars_changed_stamp;

Is this bug still exist in F23? Is not please close else move to F23. 
We don't want to loose any valuable bug :)

Thanks Ting-Wei Lan. Moving to F23.

Mitigated with commit c51ad13292f739790494b8b22a23b35a04e2cd9e
Note that you need to turn on "Clean pre-edit buffer when focus out" to mitigate this issue.

ibus-chewing-1.5.0-1.fc23 has been submitted as an update to Fedora 23. https://bodhi.fedoraproject.org/updates/FEDORA-2016-3fa61a9a2a

ibus-chewing-1.5.0-1.fc23 has been pushed to the Fedora 23 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2016-3fa61a9a2a

ibus-chewing-1.5.0-1.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.