[Xcb] [Bug 78081] New: Some programs (emacs, urxvt) hang at xcb_wait_for_event

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Tue Apr 29 06:59:04 PDT 2014 

https://bugs.freedesktop.org/show_bug.cgi?id=78081

          Priority: medium
            Bug ID: 78081
          Assignee: xcb at lists.freedesktop.org
           Summary: Some programs (emacs,urxvt) hang at xcb_wait_for_event
        QA Contact: xcb at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: n142857 at gmail.com
          Hardware: Other
            Status: NEW
           Version: 1.10
         Component: Library
           Product: XCB

Hi, in last months (early 2014) I started seeing strange hangs in Emacs and
urxvt which I think are due to XCB. I use GNU/Linux Debian with
libxcb1==1.10-2, wmii==3.10~20120413+hg2813-6 window manager.
  The program window becomes black and doesn't react to mouse/keyboard events
or kill signals (I tried many numbers). I have to kill the process (or mess up
gdb until it dies with SIGSEGV). Same for both programs.


*)  Emacs hung. Version: GNU Emacs 24.4.50.1 (x86_64-unknown-linux-gnu, X
toolkit, Xaw scroll bars) of 2014-04-19

(gdb) bt
#0  0x00007f3e744de710 in __poll_nocancel () at
../sysdeps/unix/syscall-template.S:81
#1  0x00007f3e73fea232 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f3e73febd0f in xcb_wait_for_event () from
/usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f3e75aa3918 in _XReadEvents () from
/usr/lib/x86_64-linux-gnu/libX11.so.6
#4  0x00007f3e75a8beb1 in XIfEvent () from
/usr/lib/x86_64-linux-gnu/libX11.so.6
#5  0x00007f3e75ad2764 in ?? () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#6  0x00007f3e75ad33c0 in ?? () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#7  0x00007f3e75ad36b1 in _XimRead () from
/usr/lib/x86_64-linux-gnu/libX11.so.6
#8  0x00007f3e75ac2096 in ?? () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#9  0x00007f3e75ab02fd in XSetICValues () from
/usr/lib/x86_64-linux-gnu/libX11.so.6
#10 0x000000000050f099 in xic_set_preeditarea (w=0x5113858, x=768, y=56) at
xfns.c:2106
#11 0x0000000000504c0a in x_draw_window_cursor (w=0x5113858,
glyph_row=0x18039870, x=768, y=56, cursor_type=FILLED_BOX_CURSOR,
cursor_width=1, on_p=true, active_p=true)
    at xterm.c:7312
#12 0x0000000000477484 in display_and_set_cursor (w=0x5113858, on=true,
hpos=96, vpos=4, x=768, y=56) at xdisp.c:27214
#13 0x00000000004f7070 in x_update_window_end (w=0x5113858, cursor_on_p=true,
mouse_face_overwritten_p=false) at xterm.c:582
#14 0x00000000004133ae in update_window (w=0x5113858, force_p=true) at
dispnew.c:3486
#15 0x00000000004129f8 in update_window_tree (w=0x5113858, force_p=true) at
dispnew.c:3161
#16 0x00000000004129bd in update_window_tree (w=0x524ef10, force_p=true) at
dispnew.c:3159
#17 0x00000000004126d1 in update_frame (f=0x5113640, force_p=true,
inhibit_hairy_id_p=false) at dispnew.c:3059
#18 0x000000000044b5ee in redisplay_internal () at xdisp.c:13873
#19 0x00000000004495cd in redisplay () at xdisp.c:13056
#20 0x00000000005292ed in read_char (commandflag=1, map=375333574,
prev_event=12839794, used_mouse_menu=0x7fff8cc0c69f, end_time=0x0) at
keyboard.c:2751
#21 0x0000000000534c1a in read_key_sequence (keybuf=0x7fff8cc0c880, bufsize=30,
prompt=12839794, dont_downcase_last=false, can_return_switch_frame=true, 
    fix_current_buffer=true, prevent_redisplay=false) at keyboard.c:9076
#22 0x0000000000526840 in command_loop_1 () at keyboard.c:1449
#23 0x00000000005b3a60 in internal_condition_case (bfun=0x526487
<command_loop_1>, handlers=12890850, hfun=0x525d99 <cmd_error>) at eval.c:1354
#24 0x00000000005261e1 in command_loop_2 (ignore=12839794) at keyboard.c:1174
#25 0x00000000005b3272 in internal_catch (tag=12886738, func=0x5261bb
<command_loop_2>, arg=12839794) at eval.c:1118
#26 0x000000000052618f in command_loop () at keyboard.c:1153
#27 0x0000000000525994 in recursive_edit_1 () at keyboard.c:777
#28 0x0000000000525b01 in Frecursive_edit () at keyboard.c:845
#29 0x0000000000523acf in main (argc=2, argv=0x7fff8cc0cd08) at emacs.c:1654



* urxvt hung. rxvt-unicode==9.19-1. Started with daemon:  urxvtcd

(gdb) bt
#0  0x00007f1b40226710 in __poll_nocancel () at
../sysdeps/unix/syscall-template.S:81
#1  0x00007f1b3f481232 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f1b3f482d0f in xcb_wait_for_event () from
/usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f1b4166d918 in _XReadEvents () from
/usr/lib/x86_64-linux-gnu/libX11.so.6
#4  0x00007f1b41655eb1 in XIfEvent () from
/usr/lib/x86_64-linux-gnu/libX11.so.6
#5  0x00007f1b4169c764 in ?? () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#6  0x00007f1b4169d3c0 in ?? () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#7  0x00007f1b4169d6b1 in _XimRead () from
/usr/lib/x86_64-linux-gnu/libX11.so.6
#8  0x00007f1b4168c096 in ?? () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#9  0x00007f1b4167a2fd in XSetICValues () from
/usr/lib/x86_64-linux-gnu/libX11.so.6
#10 0x00000000004281bf in rxvt_term::im_send_spot() ()
#11 0x000000000041e6d9 in rxvt_term::flush() ()
#12 0x0000000000438640 in ev_invoke_pending() ()
#13 0x000000000043989e in ev_run ()
#14 0x0000000000418e87 in main ()
(gdb) 


  In addition I'm using scim (input method).

  If there's some way in which I can advance the research of this bug, please
tell me. It happens rarely, maybe once a week. I didn't see any pattern.
  I tried as a workaround to go up the stack and then forcing „return“ in gdb
but it only crashed or hung again. Tips to unblock apps are welcome.

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