Xemacs hangs while repainting frame

In XEmacs 21.4 (patch 2) "Developer-Friendly Unix APIs" [Lucid] (sparc-sun-solaris2.8, Mule) of Tue Jun 19 2001 on tycoon configured using `configure --without-gcc --prefix=/net/tycoon/space/Xemacs --site-includes=/usr/local/include:/opt/gnome-1.4/include --site-libraries=/usr/local/lib:/opt/gnome-1.4/lib --with-jpeg --with-xpm --with-png --with-ncurses --with-workshop --with-tooltalk --with-mule --external-widget --package-path=/net/tycoon/space/xemacs-packages' Please describe exactly what actions triggered the bug and the precise symptoms of the bug: Once in a while, when I switch desktops, Xemacs hangs while repainting the frame. Usually I have emacs frames (may be more than one) in all my desktops - 10 of them. I can't reproduce this at will, but this occurs almost every day and is not dependant on how long it has been running. I can't relate it with the X/system load also. I am running Windowmaker on top of openwindows. I tried using Xemacs 21.5 beta and there also ran into the same trouble. This was the stack at the time of hang. 1904: /home/binu/bin/Xemacs feb994bc poll (ffbeea50, 1, ffffffff) feb4c770 select (7, 0, febbb1d4, febbb1d4, ffbeeb00, ffbeea50) + 2cc fee9bdb8 _XWaitForReadable (6, 1, ffbeeb00, 40, 21af8, feb9b94c) + e4 fee9bbd0 _XRead (ffffffff, ffbeeca8, 20, 20, 20, ffbeeca8) + e8 fee9cc28 _XReply (69b800, a858, 0, 40960, 4a858, 0) + 154 feeb0144 XAllocColor (69b800, 2400001, ffbeed98, 8, 8, ffbeed10) + 9c 00268c90 allocate_nearest_color (69b800, 2400001, 674e00, ffbeed98, 216a9541, 272f74) + 268 0026e21c x_generate_shadow_pixels (c6c5cb, 674e00, 0, 2400001, 1, 69b800) + 178 0026bf1c x_bevel_area (3e8200, 1000c, 3dd600, 0, 2, 0) + cc 00207058 bevel_modeline (abfc00, 69a200, 4, 3, 2, ef2000) + 158 0026be38 x_output_display_block (0, 0, 0, 0, 5, 244) + 8b8 00202528 compare_display_blocks (1, abfc00, 53, 0, 1, e08800) + 294 0020298c output_display_line (abfc00, 24b, cc6000, f2a140, 0, 0) + 280 00206d08 redisplay_output_window (abfc00, ffffffff, ffffffff, 39, 69a200, 39) + 290 001f9224 redisplay_window (abfc00, 2d95, 1, cc6000, cc6000, 3dd600) + 1078 001f96a0 redisplay_frame (3dd600, 69a200, 313bd0, 30c400, 0, e6a628) + 244 001f9a90 redisplay_device (69a200, 313bd0, 3dd600, 0, 0, 378fc0) + 26c 001fa0b0 redisplay_without_hooks (6a41b4, 313bd0, 69a200, 1, 0, 6a416c) + 338 00118368 Fnext_event (313bd0, 3120c8, 311c00, 340804, 313c00, 1) + 3f8 000797dc Fcommand_loop_1 (0, 30c400, 313800, 312000, ffbef4cc, a63190) + 18c 000a8418 condition_case_1 (305c00, 313c00, 312000, 78ecc, 340804, 0) + 110 00079108 command_loop_2 (313bd0, 790c0, 0, 0, 0, 0) + 48 000a75f4 internal_catch (3541b4, 790c0, 340804, 0, 0, 0) + b0 000792e4 initial_command_loop (311b48, 313bd0, 311c00, 5bcedc, 3ce634, 5bce6c) + 1bc 0009d53c xemacs_21_4_2_sparc_sun_solaris2_8 (1, 335000, 340804, ffbef7f0, ffbef904, 2ca400) + 1378 0009df8c main (1, ffbef904, ffbef90c, 2f7400, 0, 0) + b8 0004a2d4 _start (0, 0, 0, 0, 0, 0) + dc I did a straight kill and then the stack was this: 1904: /home/binu/bin/Xemacs feb994c0 _poll (d, 0, ffbef138, ffbef0b8, ffbef038, ffbeef20) + 8 fef8bcc0 _XtWaitForSomething (3dc400, 0, 0, 1, f4240, 0) + 1e4 fef90e94 XtAppPending (4, 1, 2, 4, 3dc400, 1) + 264 0025bed4 emacs_Xt_event_pending_p (1, 313bd0, 3143e0, 0, 0, 10406d1) + 140 001182a8 Fnext_event (313bd0, 3120c8, 311c00, 340804, 313c00, 1) + 338 000797dc Fcommand_loop_1 (0, 312000, 313800, 312000, ffbef4cc, a63184) + 18c 000a8418 condition_case_1 (305c00, 313c00, 312000, 78ecc, 340804, 0) + 110 00079108 command_loop_2 (313bd0, 790c0, b, fffffff8, 0, 104a9d5) + 48 000a75f4 internal_catch (3541b4, 790c0, 340804, 0, 340804, 18) + b0 000792e4 initial_command_loop (311b48, 313bd0, 334c00, 5bcedc, 3ce634, 5bce6c) + 1bc 0009d53c xemacs_21_4_2_sparc_sun_solaris2_8 (1, 335000, 340804, ffbef7f0, ffbef904, 2ca400) + 1378 0009df8c main (1, ffbef904, ffbef90c, 2f7400, 0, 0) + b8 0004a2d4 _start (0, 0, 0, 0, 0, 0) + dc b I ran lsof and it gave this: COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME xemacs-21 1904 binu cwd VDIR 264,2 4608 6266947 /home/binu xemacs-21 1904 binu txt VREG 136,3 7058296 28065 /space/Xemacs/bin/xemacs-21.4.2 xemacs-21 1904 binu txt VREG 136,0 23780 78118 /usr/lib/liblayout.so.1 xemacs-21 1904 binu txt VREG 136,0 17096 101509 /usr/platform/sun4u/lib/libc_psr.so.1 xemacs-21 1904 binu txt VREG 136,0 24968 78265 /usr/lib/libmp.so.2 xemacs-21 1904 binu txt VREG 136,0 46932 78229 /usr/lib/libaio.so.1 xemacs-21 1904 binu txt VREG 136,0 382604 78279 /usr/lib/libresolv.so.2 xemacs-21 1904 binu txt VREG 136,0 513204 231055 /opt/gnome/lib/libaudiofile.so.0.0.0 xemacs-21 1904 binu txt VREG 136,0 115208 187482 /usr/openwin/lib/libdga.so.1 xemacs-21 1904 binu txt VREG 136,0 102424 78315 /usr/lib/libm.so.1 xemacs-21 1904 binu txt VREG 136,0 120240 187436 /usr/openwin/lib/libICE.so.6 xemacs-21 1904 binu txt VREG 136,0 57004 187470 /usr/openwin/lib/libSM.so.6 xemacs-21 1904 binu txt VREG 136,0 1136608 78232 /usr/lib/libc.so.1 xemacs-21 1904 binu txt VREG 136,0 67924 231032 /opt/gnome/lib/libz.so.1.1.3 xemacs-21 1904 binu txt VREG 136,0 42184 78250 /usr/lib/libgen.so.1 xemacs-21 1904 binu txt VREG 136,0 224200 78256 /usr/lib/libldap.so.4 xemacs-21 1904 binu txt VREG 136,0 70260 78288 /usr/lib/libsocket.so.1 xemacs-21 1904 binu txt VREG 136,0 888972 78268 /usr/lib/libnsl.so.1 xemacs-21 1904 binu txt VREG 136,0 41592 78281 /usr/lib/librt.so.1 xemacs-21 1904 binu txt VREG 136,0 150836 230884 /opt/gnome/lib/libesd.so.0.2.20 xemacs-21 1904 binu txt VREG 136,0 338384 97964 /usr/local/lib/libncurses.so.5.2 xemacs-21 1904 binu txt VREG 136,0 30356 231035 /opt/gnome/lib/libgdbm.so.2.0.0 xemacs-21 1904 binu txt VREG 136,0 4092380 230868 /opt/gnome/lib/libdb-3.0.so xemacs-21 1904 binu txt VREG 136,0 967516 187471 /usr/openwin/lib/libX11.so.4 xemacs-21 1904 binu txt VREG 136,0 140332 187475 /usr/openwin/lib/libXext.so.0 xemacs-21 1904 binu txt VREG 136,0 477588 187480 /usr/openwin/lib/libXt.so.4 xemacs-21 1904 binu txt VREG 136,0 142400 187478 /usr/openwin/lib/libXmu.so.4 xemacs-21 1904 binu txt VREG 136,0 709444 187432 /usr/openwin/lib/libtt.so.2 xemacs-21 1904 binu txt VREG 136,0 145656 230802 /opt/gnome/lib/libjpeg.so.62.0.0 xemacs-21 1904 binu txt VREG 136,0 2427804 58581 /usr/dt/lib/libXm.so.4 xemacs-21 1904 binu txt VREG 136,0 101520 97987 /usr/local/lib/libXpm.so xemacs-21 1904 binu txt VREG 136,0 178756 230715 /opt/gnome/lib/libpng.so.2.1.0.8 xemacs-21 1904 binu txt VREG 136,0 4624 78245 /usr/lib/libdl.so.1 xemacs-21 1904 binu txt VREG 136,0 195104 78129 /usr/lib/ld.so.1 xemacs-21 1904 binu 0r VCHR 13,2 0t0 245985 /devices/pseudo/mm＠0:null xemacs-21 1904 binu 1u VCHR 0,0 0t39200 245976 /devices/pseudo/cn＠0:console xemacs-21 1904 binu 2u VCHR 0,0 0t39200 245976 /devices/pseudo/cn＠0:console xemacs-21 1904 binu 3u FIFO 0x30001398220 0t0 1225 PIPE->0x30001398308 xemacs-21 1904 binu 4u FIFO 0x30001398308 0t1 1225 PIPE->0x30001398220 xemacs-21 1904 binu 5r DOOR 0,25 0t0 23064 door to nscd[215] xemacs-21 1904 binu 6u FIFO 0x300017e6790 0t0 123 PIPE->0x30001217e20 (FA:->0x300000751a8) xemacs-21 1904 binu 7u FIFO 0x30001216220 0t0 1230 PIPE->0x30001216308 xemacs-21 1904 binu 8u VCHR 23,7 0t123 246230 /devices/pseudo/clone＠0:ptmx->ptm xemacs-21 1904 binu 9u VCHR 23,4 0t26957 246230 /devices/pseudo/clone＠0:ptmx->ptm xemacs-21 1904 binu 10u VCHR 23,5 0t29937 246230 /devices/pseudo/clone＠0:ptmx->ptm xemacs-21 1904 binu 11u FIFO 0x300015c3b08 0t55 1231 PIPE->0x300015c3a20 cheers Binu