Step 1
28/08/12 19:22:46,776 Safari[285]: CGContextClipToRect: invalid context 0x0
28/08/12 19:22:58,200 Safari[285]: Received an invalid message from the web process with message ID 323002f
28/08/12 19:24:07,259 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 19:24:12,259 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 19:24:55,186 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 19:25:47,775 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 19:26:18,321 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 19:26:36,959 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 19:26:39,321 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 19:30:10,722 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 19:31:01,673 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 19:31:05,763 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 19:31:28,160 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 19:43:58,929 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 19:48:12,073 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 19:48:23,944 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 19:48:55,358 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 19:50:02,940 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 19:52:52,957 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 19:52:55,971 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 19:54:07,153 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 19:54:21,224 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 19:54:59,898 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 19:55:31,952 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 19:56:14,749 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 19:56:17,279 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 20:01:06,716 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 20:01:08,230 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 20:01:25,804 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 20:01:50,091 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 20:02:23,235 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 20:02:38,734 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 20:03:09,175 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 20:03:25,247 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 20:03:26,715 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 20:04:47,355 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 20:05:03,890 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 20:08:12,027 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 20:09:18,972 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 20:11:55,499 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 20:14:09,510 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 20:14:24,122 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 20:14:33,435 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 20:21:00,977 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 20:21:07,057 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 20:22:29,238 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 20:23:23,536 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 20:24:11,512 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 20:24:30,413 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 20:28:13,414 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 20:31:58,880 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 21:33:30,773 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 21:37:48,105 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 21:39:13,610 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 21:42:11,163 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 21:44:12,914 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 21:44:36,130 Safari[315]: CGContextClipToRect: invalid context 0x0
28/08/12 21:44:46,359 Safari[315]: CGContextClipToRect: invalid context 0x0
Step 2
Sorry for the screenshot... But there isn't any report for Safari! Just WebProcess, I don't know it!
(No problem for me to share my UUID...)