This document: http://www.freebsd.org/doc/en_US.ISO8859- 1/books/faq/troubleshoot.html#INDEFINITE-WAIT-BUFFER
includes: >5.30. What does the error ``swap_pager: indefinite wait buffer:'' mean? > >This means that a process is trying to page memory to disk, and the page >attempt has hung trying to access the disk for more than 20 seconds. It might >be caused by bad blocks on the disk drive, disk wiring, cables, or any other >disk I/O-related hardware. If the drive itself is actually bad, you will also >see disk errors in /var/log/messages and in the output of dmesg. Otherwise, >check your cables and connections. I am seeing occasional "swap_pager: indefinite wait buffer" on 4 systems under a heavy simultaneous sequential i/o test on ATA devices ad0 and ad1 (on the same channel). swap is on ad0. ad1 is mounted as /test and ad1 is filled to capacity and read back repeatedly. ad0 is filled to maybe 50% capacitity and read back repeatedly. System hardware is: http://www.freebsd.uwaterloo.ca/twiki/bin/view/Freebsd/IntelP4 o/s is: FreeBSD ecserv1.uwaterloo.ca 4.7-RELEASE FreeBSD 4.7-RELEASE #0: Wed Oct 9 15:08:34 GMT 2002 [EMAIL PROTECTED]:/usr/obj/usr/src/sys/GENERIC i386 I am not using tagged queueing. Both disks are reported as UDMA33. Logs are below. There are no disk errors. During the test, ad0 and ad1 are each reading or writing around 25 megabytes per second. Load average is around 0.25, but system is very slow to log in to, or to respond to keyboard, during the test. Same test on 4 dual processor AMD systems (with the same disks) does not yield this particular problem. Same test with just one disk under test does not yield this problem. Under normal type usage, the problem never happens. I'm just reporting this to indicate that there appears to be some other cause than disk errors for this problem. Logs of 4 systems are: Jan 5 00:00:00 ecserv2 newsyslog[1784]: logfile turned over Jan 5 21:33:07 ecserv2 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 640, size: 4096 Jan 5 21:33:37 ecserv2 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 640, size: 4096 Jan 5 22:45:21 ecserv2 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 432, size: 4096 Jan 5 22:46:18 ecserv2 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 432, size: 4096 Jan 5 22:46:18 ecserv2 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 432, size: 4096 Jan 6 00:00:00 ecserv2 newsyslog[9854]: logfile turned over Jan 6 00:00:00 ecserv2 newsyslog[9854]: logfile turned over Jan 6 01:50:20 ecserv2 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 312, size: 4096 Jan 6 01:51:18 ecserv2 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 312, size: 4096 Jan 6 02:40:37 ecserv2 /kernel: pid 9894 (file1), uid 0 on /test: file system full Jan 6 07:56:50 ecserv2 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 264, size: 4096 Jan 6 07:57:02 ecserv2 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 272, size: 4096 Jan 6 08:56:55 ecserv2 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 328, size: 4096 Jan 6 09:40:33 ecserv2 /kernel: pid 10624 (file1), uid 0 on /test: file system full Jan 6 10:46:50 ecserv2 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 432, size: 4096 Jan 6 10:46:50 ecserv2 last message repeated 4 times Jan 6 12:55:21 ecserv2 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 432, size: 4096 Jan 6 12:56:40 ecserv2 last message repeated 3 times Jan 6 16:39:44 ecserv2 /kernel: pid 11112 (file1), uid 0 on /test: file system full Jan 6 19:45:20 ecserv2 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 432, size: 4096 Jan 6 20:56:51 ecserv2 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 288, size: 4096 Jan 6 20:58:15 ecserv2 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 312, size: 4096 Jan 6 20:58:45 ecserv2 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 312, size: 4096 Jan 6 20:58:45 ecserv2 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 328, size: 4096 Jan 6 22:56:51 ecserv2 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 344, size: 4096 Jan 6 23:05:40 ecserv2 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 432, size: 4096 Jan 6 23:38:43 ecserv2 /kernel: pid 11570 (file1), uid 0 on /test: file system full Jan 7 00:00:00 ecserv2 newsyslog[11731]: logfile turned over Jan 7 00:00:00 ecserv2 newsyslog[11731]: logfile turned over Jan 7 01:46:23 ecserv2 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 528, size: 4096 Jan 7 02:56:51 ecserv2 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 264, size: 4096 Jan 7 02:58:29 ecserv2 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 272, size: 4096 Jan 7 02:58:29 ecserv2 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 264, size: 4096 Jan 7 02:58:29 ecserv2 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 272, size: 4096 Jan 7 02:58:29 ecserv2 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 296, size: 4096 Jan 7 02:58:29 ecserv2 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 328, size: 4096 Jan 7 03:56:52 ecserv2 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 528, size: 4096 Jan 7 03:58:31 ecserv2 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 528, size: 4096 Jan 7 04:01:40 ecserv2 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 432, size: 4096 Jan 7 04:01:40 ecserv2 last message repeated 4 times Jan 7 06:39:14 ecserv2 /kernel: pid 12323 (file1), uid 0 on /test: file system full Jan 7 08:56:52 ecserv2 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 272, size: 4096 Jan 7 08:57:39 ecserv2 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 320, size: 4096 Jan 7 08:57:39 ecserv2 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 272, size: 4096 Jan 7 08:57:39 ecserv2 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 320, size: 4096 Jan 7 08:57:39 ecserv2 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 272, size: 4096 Jan 7 08:57:39 ecserv2 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 320, size: 4096 Jan 5 00:00:00 ecserv4 newsyslog[63561]: logfile turned over Jan 6 00:00:00 ecserv4 newsyslog[69772]: logfile turned over Jan 6 00:00:00 ecserv4 newsyslog[69772]: logfile turned over Jan 6 01:54:21 ecserv4 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 296, size: 4096 Jan 6 01:56:04 ecserv4 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 296, size: 4096 Jan 6 01:56:04 ecserv4 last message repeated 4 times Jan 6 03:06:41 ecserv4 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 512, size: 4096 Jan 6 03:06:41 ecserv4 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 512, size: 4096 Jan 6 04:31:20 ecserv4 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 512, size: 4096 Jan 6 04:35:45 ecserv4 /kernel: pid 69877 (file1), uid 0 on /test: file system full Jan 6 06:25:20 ecserv4 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 616, size: 4096 Jan 6 06:26:05 ecserv4 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 616, size: 4096 Jan 6 06:26:05 ecserv4 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 616, size: 4096 Jan 6 07:54:22 ecserv4 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 296, size: 4096 Jan 6 09:04:35 ecserv4 sshd[70607]: fatal: Timeout before authentication for 129.97.50.121. Jan 6 09:06:04 ecserv4 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 312, size: 4096 Jan 6 09:06:36 ecserv4 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 312, size: 4096 Jan 6 09:07:21 ecserv4 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 432, size: 4096 Jan 6 09:07:21 ecserv4 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 312, size: 4096 Jan 6 09:07:21 ecserv4 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 432, size: 4096 Jan 6 09:07:21 ecserv4 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 312, size: 4096 Jan 6 09:07:21 ecserv4 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 432, size: 4096 Jan 6 09:07:21 ecserv4 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 1008, size: 4096 Jan 6 09:06:46 ecserv4 sshd[70608]: fatal: Timeout before authentication for 129.97.50.121. Jan 6 13:12:20 ecserv4 /kernel: pid 70723 (file1), uid 0 on /test: file system full Jan 6 18:54:22 ecserv4 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 296, size: 4096 Jan 6 21:47:50 ecserv4 /kernel: pid 71268 (file1), uid 0 on /test: file system full Jan 7 00:00:00 ecserv4 newsyslog[71586]: logfile turned over Jan 7 00:00:00 ecserv4 newsyslog[71586]: logfile turned over Jan 7 04:24:23 ecserv4 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 272, size: 4096 Jan 7 04:25:20 ecserv4 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 256, size: 4096 Jan 7 04:25:46 ecserv4 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 256, size: 4096 Jan 7 04:33:08 ecserv4 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 352, size: 4096 Jan 7 04:34:09 ecserv4 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 352, size: 4096 Jan 7 04:34:09 ecserv4 last message repeated 2 times Jan 7 06:23:48 ecserv4 /kernel: pid 72089 (file1), uid 0 on /test: file system full Jan 7 07:54:23 ecserv4 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 296, size: 4096 Jan 7 07:55:37 ecserv4 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 296, size: 4096 Jan 7 07:55:37 ecserv4 last message repeated 2 times Jan 7 09:01:21 ecserv4 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 376, size: 4096 Jan 7 10:25:20 ecserv4 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 512, size: 4096 Jan 7 10:27:36 ecserv4 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 512, size: 4096 Jan 7 10:27:36 ecserv4 last message repeated 3 times Jan 7 10:27:36 ecserv4 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 336, size: 4096 Jan 7 10:27:36 ecserv4 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 512, size: 4096 Jan 7 10:27:36 ecserv4 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 392, size: 4096 Jan 7 10:27:36 ecserv4 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 376, size: 4096 Jan 5 00:00:00 ecserv12 newsyslog[62526]: logfile turned over Jan 5 22:35:21 ecserv12 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 504, size: 4096 Jan 5 22:36:03 ecserv12 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 592, size: 4096 Jan 5 22:37:05 ecserv12 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 600, size: 4096 Jan 6 00:00:00 ecserv12 newsyslog[66950]: logfile turned over Jan 6 00:00:00 ecserv12 newsyslog[66950]: logfile turned over Jan 6 00:15:21 ecserv12 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 600, size: 4096 Jan 6 01:54:22 ecserv12 /kernel: pid 66738 (file1), uid 0 on /test: file system full Jan 6 09:15:22 ecserv12 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 504, size: 4096 Jan 6 09:21:15 ecserv12 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 272, size: 4096 Jan 6 09:21:22 ecserv12 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 344, size: 4096 Jan 6 09:21:25 ecserv12 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 272, size: 4096 Jan 6 09:21:32 ecserv12 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 344, size: 4096 Jan 6 09:22:08 ecserv12 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 272, size: 4096 Jan 6 09:23:07 ecserv12 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 344, size: 4096 Jan 6 09:25:40 ecserv12 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 408, size: 4096 Jan 6 09:39:53 ecserv12 /kernel: pid 67530 (file1), uid 0 on /test: file system full Jan 6 14:01:20 ecserv12 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 376, size: 4096 Jan 6 15:25:20 ecserv12 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 504, size: 4096 Jan 6 15:26:31 ecserv12 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 504, size: 4096 Jan 6 15:26:38 ecserv12 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 504, size: 4096 Jan 6 17:28:49 ecserv12 /kernel: pid 67966 (file1), uid 0 on /test: file system full Jan 6 21:55:20 ecserv12 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 504, size: 4096 Jan 6 21:57:25 ecserv12 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 504, size: 4096 Jan 6 21:57:25 ecserv12 last message repeated 5 times Jan 7 00:00:00 ecserv12 newsyslog[68602]: logfile turned over Jan 7 00:00:00 ecserv12 newsyslog[68602]: logfile turned over Jan 7 01:22:35 ecserv12 /kernel: pid 68417 (file1), uid 0 on /test: file system full Jan 7 09:16:24 ecserv12 /kernel: pid 69143 (file1), uid 0 on /test: file system full Jan 5 00:00:01 ecserv15 newsyslog[61750]: logfile turned over Jan 6 00:00:00 ecserv15 newsyslog[67959]: logfile turned over Jan 6 00:00:00 ecserv15 newsyslog[67959]: logfile turned over Jan 6 04:53:36 ecserv15 /kernel: pid 68078 (file1), uid 0 on /test: file system full Jan 6 09:25:27 ecserv15 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 576, size: 4096 Jan 6 10:45:34 ecserv15 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 456, size: 4096 Jan 6 10:45:57 ecserv15 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 456, size: 4096 Jan 6 13:35:39 ecserv15 /kernel: pid 68914 (file1), uid 0 on /test: file system full Jan 6 17:50:20 ecserv15 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 504, size: 4096 Jan 6 17:50:50 ecserv15 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 504, size: 4096 Jan 6 22:16:43 ecserv15 /kernel: pid 69461 (file1), uid 0 on /test: file system full Jan 7 00:00:45 ecserv15 newsyslog[69749]: logfile turned over Jan 7 00:00:45 ecserv15 newsyslog[69749]: logfile turned over Jan 7 03:50:20 ecserv15 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 504, size: 4096 Jan 7 03:50:57 ecserv15 /kernel: swap_pager: indefinite wait buffer: device: #ad/0x20001, blkno: 504, size: 4096 Jan 7 06:56:44 ecserv15 /kernel: pid 70291 (file1), uid 0 on /test: file system full -- Bruce Campbell Engineering Computing CPH-2374B University of Waterloo (519)888-4567 ext 5889 ---------------------------------------- This mail sent through www.mywaterloo.ca To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-questions" in the body of the message
