Aiden Luo created GUACAMOLE-149:
-----------------------------------
Summary: guac_terminal_display_set_columns endless loop use full
cpu time
Key: GUACAMOLE-149
URL: https://issues.apache.org/jira/browse/GUACAMOLE-149
Project: Guacamole
Issue Type: Bug
Components: guacamole-server
Affects Versions: 0.9.9
Environment: ubuntu 14.04
Reporter: Aiden Luo
Sometimes the guacamole sever use almost all cpu time. It is caused by the
endless loop in `guac_terminal_display_set_columns `.
```
(gdb) bt
#0 guac_terminal_display_set_columns (display=0x30f5480, row=11,
start_column=22, end_column=22, character=0x2cf3b18)
at display.c:458
#1 0x00007f8b3fa68374 in guac_terminal_commit_cursor
(term=term@entry=0x2c0b5b0) at terminal.c:649
#2 0x00007f8b3fa69329 in guac_terminal_flush
(terminal=terminal@entry=0x2c0b5b0) at terminal.c:1339
#3 0x00007f8b3fa69440 in guac_terminal_render_frame (terminal=0x2c0b5b0) at
terminal.c:489
#4 0x000000000040312d in __guacd_client_output_thread (data=0x2bea930) at
client.c:73
#5 0x00007f8b43469184 in start_thread (arg=0x7f8b3c326700) at
pthread_create.c:312
#6 0x00007f8b4319637d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:111
(gdb) f 0
#0 guac_terminal_display_set_columns (display=0x30f5480, row=11,
start_column=22, end_column=22, character=0x2cf3b18)
at display.c:458
458 current->type = GUAC_CHAR_SET;
(gdb) list
453
454 /* For each column in range */
455 for (i = start_column; i <= end_column; i += character->width) {
456
457 /* Set operation */
458 current->type = GUAC_CHAR_SET;
459 current->character = *character;
460
461 /* Next character */
462 current += character->width;
(gdb) p character->width
$113 = 0
(gdb)
```
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