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Message-Id: <199707041424.QAA09924@ikke.idi.ntnu.no>
Date: Fri, 4 Jul 1997 16:24:58 +0200 (MET DST)
From: Tor Egge <Tor.Egge@idi.ntnu.no>
Reply-To: Tor.Egge@idi.ntnu.no
To: FreeBSD-gnats-submit@FreeBSD.ORG
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Subject: kern/4032: 
Sender: owner-bugs@FreeBSD.ORG
X-Loop: FreeBSD.org
Precedence: bulk


>Number:         4032
>Category:       kern
>Synopsis:       
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Jul  4 07:30:00 PDT 1997
>Last-Modified:
>Originator:     Tor Egge
>Organization:
Norwegian University of Science and Technology, Trondheim, Norway
>Release:        FreeBSD 3.0-CURRENT i386
>Environment:

FreeBSD ikke.idi.ntnu.no 3.0-CURRENT FreeBSD 3.0-CURRENT #5: Wed Jul  2 04:07:08 MET DST 1997     root@ikke.idi.ntnu.no:/usr/src/sys/compile/TEGGE_SMP  i386

	(Using sources from Jun 27 1997)
	AHA 2940UW disk controller with 5 Quantum XP34300W L915 disks attached.
	options AHC_TAGENABLE
	options AHC_SCBPAGING_ENABLE
	options AHC_ALLOW_MEMIO


(Using slightly modified sequencer code to disable pause in a critical region)

Index: aic7xxx.seq
===================================================================
RCS file: /home/ncvs/src/sys/dev/aic7xxx/aic7xxx.seq,v
retrieving revision 1.73
diff -c -r1.73 aic7xxx.seq
*** aic7xxx.seq	1997/04/24 16:52:18	1.73
--- aic7xxx.seq	1997/07/02 02:06:07
***************
*** 708,714 ****
--- 708,716 ----
  mesgin_disconnect:
  	or	SCB_CONTROL,DISCONNECTED;
  .if ( SCB_PAGING )
+ 	mvi	SEQCTL, PAUSEDIS|FASTMODE;
  	call	add_scb_to_disc_list;
+ 	mvi	SEQCTL, FASTMODE;
  .endif
  	jmp	await_busfree;
  
	

>Description:

During recovery from scsi errors, incorrect contents might be written to
the disk.

Most of the data in the bad region is shifted 2 bytes.
Some of the data is shifted 1 byte.
Some of the data is shifted 3 bytes.
Two 16 bits word are duplicates, and two 16 bits words are lost.

---- Cut from syslog
Jul  4 08:45:01 ikke xntpd[121]: time reset (step) 0.506981 s
Jul  4 09:36:44 ikke /kernel: sd8: SCB 0x11 - timed out in dataout phase, SCSISIGI == 0x4
Jul  4 09:36:44 ikke /kernel: SEQADDR = 0x48 SCSISEQ = 0x12 SSTAT0 = 0x7 SSTAT1 = 0x2
Jul  4 09:36:44 ikke /kernel: Ordered Tag queued
Jul  4 09:36:44 ikke /kernel: sd7: SCB 0xf timedout while recovery in progress
Jul  4 09:36:44 ikke /kernel: sd6: SCB 0x13 timedout while recovery in progress
Jul  4 09:36:44 ikke /kernel: sd8: SCB 0x8 timedout while recovery in progress
Jul  4 09:36:44 ikke /kernel: sd7: SCB 0x5 timedout while recovery in progress
Jul  4 09:36:44 ikke /kernel: sd7: SCB 0x6 timedout while recovery in progress
Jul  4 09:36:44 ikke /kernel: sd6: SCB 0x10 timedout while recovery in progress
Jul  4 09:36:44 ikke /kernel: sd8: SCB 0x12 timedout while recovery in progress
Jul  4 09:36:44 ikke /kernel: sd6: SCB 0x4 timedout while recovery in progress
Jul  4 09:36:44 ikke /kernel: sd8: SCB 0xc timedout while recovery in progress
Jul  4 09:36:44 ikke /kernel: sd7: SCB 0x3 timedout while recovery in progress
Jul  4 09:36:44 ikke /kernel: sd6: SCB 0xb timedout while recovery in progress
Jul  4 09:36:46 ikke /kernel: sd10: SCB 0xe timedout while recovery in progress
Jul  4 09:36:49 ikke /kernel: sd8: SCB 0x11 - timed out in dataout phase, SCSISIGI == 0x4
Jul  4 09:36:49 ikke /kernel: SEQADDR = 0x48 SCSISEQ = 0x12 SSTAT0 = 0x7 SSTAT1 = 0x2
Jul  4 09:36:49 ikke /kernel: sd7: abort message in message buffer
Jul  4 09:36:49 ikke /kernel: sd7: SCB 0xf - timed out in dataout phase, SCSISIGI == 0x14
Jul  4 09:36:49 ikke /kernel: SEQADDR = 0x48 SCSISEQ = 0x12 SSTAT0 = 0x7 SSTAT1 = 0x2
Jul  4 09:36:49 ikke /kernel: ahc1: Issued Channel A Bus Reset. 13 SCBs aborted
Jul  4 09:36:49 ikke /kernel: Clearing bus reset
Jul  4 09:36:49 ikke /kernel: Clearing 'in-reset' flag
Jul  4 09:36:49 ikke /kernel: sd7: no longer in timeout
Jul  4 09:36:49 ikke /kernel: sd8: no longer in timeout
Jul  4 09:36:50 ikke /kernel: sd7: UNIT ATTENTION asc:29,2 
Jul  4 09:36:50 ikke /kernel: , retries:3
Jul  4 09:36:50 ikke /kernel: sd6: UNIT ATTENTION asc:29,2 
Jul  4 09:36:50 ikke /kernel: , retries:3
Jul  4 09:36:50 ikke /kernel: sd8: UNIT ATTENTION asc:29,2 
Jul  4 09:36:50 ikke /kernel: , retries:3
Jul  4 09:36:50 ikke /kernel: sd10: UNIT ATTENTION asc:29,2 
Jul  4 09:36:50 ikke /kernel: , retries:3
Jul  4 09:41:24 ikke /kernel: sd9: UNIT ATTENTION asc:29,2 
Jul  4 09:41:24 ikke /kernel: , retries:4
Jul  4 10:07:59 ikke /kernel: pid 8732 (mergesites), uid 26850: exited on signal 6 (core dumped)
------
ikke:/export/akg6/ftpsearch/tmp$ /bin/ls -laTtr BAD/mergetmp.2*
-rw-r--r--  1 tegge  ftpsearc    460314 Jul  4 09:32:49 1997 BAD/mergetmp.2
-rw-r--r--  1 tegge  ftpsearc  12483384 Jul  4 09:35:37 1997 BAD/mergetmp.20
-rw-r--r--  1 tegge  ftpsearc  12517086 Jul  4 09:35:46 1997 BAD/mergetmp.21
-rw-r--r--  1 tegge  ftpsearc  12379490 Jul  4 09:35:54 1997 BAD/mergetmp.22
-rw-r--r--  1 tegge  ftpsearc  12493693 Jul  4 09:36:03 1997 BAD/mergetmp.23
-rw-r--r--  1 tegge  ftpsearc  12417664 Jul  4 09:36:12 1997 BAD/mergetmp.24
-rw-r--r--  1 tegge  ftpsearc  12440211 Jul  4 09:36:20 1997 BAD/mergetmp.25
-rw-r--r--  1 tegge  ftpsearc  12349530 Jul  4 09:36:28 1997 BAD/mergetmp.26
-rw-r--r--  1 tegge  ftpsearc  12504060 Jul  4 09:36:50 1997 BAD/mergetmp.27
-rw-r--r--  1 tegge  ftpsearc  12269047 Jul  4 09:36:57 1997 BAD/mergetmp.28
-rw-r--r--  1 tegge  ftpsearc  12146091 Jul  4 09:37:05 1997 BAD/mergetmp.29
------
*** mergetmp.27.hex	Fri Jul  4 16:04:01 1997
--- BAD/mergetmp.27.hex	Fri Jul  4 16:05:11 1997
***************
*** 528806,528862 ****
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! 00820390  00 00 00 65 7c 72 08 00  81 a4 63 73 61 6d 69 2e  |...e|r....csami.|
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! 008203c0  65 73 63 00 32 e3 00 00  00 6b 7c 72 08 00 81 a4  |esc.2....k|r....|
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! 008203e0  e3 00 00 00 68 7c 72 08  00 81 a4 63 73 61 72 65  |....h|r....csare|
! 008203f0  2e 6c 7a 68 2e 64 65 73  63 00 07 ed 00 00 08 11  |.lzh.desc.......|
  00820400  7c d1 cb 19 81 a4 63 73  61 77 30 39 62 2e 74 78  ||.....csaw09b.tx|
  00820410  74 2e 67 7a 00 21 4d 00  01 2a cc 7c c4 c0 00 81  |t.gz.!M..*.|....|
  00820420  a4 63 73 68 2d 35 2e 32  36 2d 32 2e 64 65 62 00  |.csh-5.26-2.deb.|
--- 528806,528862 ----
  008200a0  7c cb 28 00 81 a4 63 72  65 61 74 65 6d 6f 64 65  ||.(...createmode|
  008200b0  2e 78 62 6d 00 2a b0 00  00 03 89 7c cb a0 00 81  |.xbm.*.....|....|
  008200c0  a4 63 72 65 61 74 65 6d  6f 64 65 2e 78 62 6d 00  |.createmode.xbm.|
! 008200d0  08 f7 08 f7 00 00 00 c7  7c a5 88 00 81 b4 63 72  |........|.....cr|
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! 008200f0  00 11 9b 7c cb c0 00 81  24 63 72 6f 61 74 69 61  |...|....$croatia|
! 00820100  6e 2e 64 74 78 2e 5a 00  5d e7 00 00 00 a3 7c cb  |n.dtx.Z.].....|.|
! 00820110  a0 00 81 24 63 72 6f 61  74 69 61 6e 2e 6d 6c 64  |...$croatian.mld|
! 00820120  2e 5a 00 07 7e 00 00 02  96 7c ca 20 00 81 a4 63  |.Z..~....|. ...c|
! 00820130  72 6f 73 73 6d 65 2e 74  78 74 2e 67 7a 00 5d 2a  |rossme.txt.gz.]*|
! 00820140  00 00 60 9a 7c cb 28 00  81 24 63 72 6f 73 73 77  |..`.|.(..$crossw|
! 00820150  72 64 2e 64 74 78 2e 5a  00 5d 2a 00 00 01 de 7c  |rd.dtx.Z.]*....||
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! 00820190  74 00 00 00 7d 7c c7 f0  00 81 a4 63 72 6f 77 62  |t...}|.....crowb|
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! 008201b0  7c a6 c0 00 81 24 63 72  6f 77 69 6e 67 2e 63 72  ||....$crowing.cr|
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  00820400  7c d1 cb 19 81 a4 63 73  61 77 30 39 62 2e 74 78  ||.....csaw09b.tx|
  00820410  74 2e 67 7a 00 21 4d 00  01 2a cc 7c c4 c0 00 81  |t.gz.!M..*.|....|
  00820420  a4 63 73 68 2d 35 2e 32  36 2d 32 2e 64 65 62 00  |.csh-5.26-2.deb.|
***************
*** 529198,529204 ****
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  00821940  20 28 44 65 6d 6f 29 00  5c a1 00 04 cc 69 7c d2  | (Demo).\....i|.|
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--- 529198,529204 ----
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  00821940  20 28 44 65 6d 6f 29 00  5c a1 00 04 cc 69 7c d2  | (Demo).\....i|.|
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  00821960  73 63 00 08 8e 00 00 0d  04 7c d2 62 51 81 a4 64  |sc.......|.bQ..d|
  00821970  65 2d 6c 61 74 69 6e 31  2e 6b 6d 61 70 00 23 6d  |e-latin1.kmap.#m|
  00821980  00 00 0d 04 7c d3 ac 00  81 a4 64 65 2d 6c 61 74  |....|.....de-lat|


>How-To-Repeat:

	Heavy disk activity with an AHA2940UW+cables+disk combination
	that causes an occational SCSI bus reset.

>Fix:
	
	Unknown.
>Audit-Trail:
>Unformatted: