Date: 13 Jan 1999 21:47:01 -0000 From: trost@cloud.rain.com To: FreeBSD-gnats-submit@FreeBSD.ORG Subject: kern/9474: "comcontrol rescan 0:8:0" hangs, causes other problems Message-ID: <19990113214701.647.qmail@grey.cloud.rain.com>
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>Number: 9474
>Category: kern
>Synopsis: "comcontrol rescan 0:8:0" hangs, causes other problems
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Wed Jan 13 13:50:00 PST 1999
>Closed-Date:
>Last-Modified:
>Originator: Bill Trost
>Release: FreeBSD 3.0-CURRENT i386 -- sup'd Jan 12 1999 14:53 PST
>Organization:
Trost Computing
>Environment:
Changes to /sys/pci/ahc_pci.c (without these, boot hangs):
--- ahc_pci.c.bak Mon Jan 11 10:24:52 1999
+++ ahc_pci.c Mon Jan 11 10:24:54 1999
@@ -243,6 +243,11 @@
int error;
char channel;
+ long csize_lattime = pci_conf_read(config_id, CSIZE_LATTIME);
+ printf("csize_lattime = %lx\n", csize_lattime);
+ csize_lattime &= ~CACHESIZE;
+ pci_conf_write(config_id, CSIZE_LATTIME, csize_lattime);
+
if (config_id->func == 1)
channel = 'B';
else
Relevant dmesg bits:
avail memory = 30457856 (29744K bytes)
Preloaded elf kernel "kernel" at 0xf025e000.
chip0: <Intel 82439> rev 0x03 on pci0.0.0
chip1: <Intel 82371SB PCI to ISA bridge> rev 0x01 on pci0.7.0
ahc0: <Adaptec 2940 Ultra SCSI adapter> rev 0x01 int a irq 7 on pci0.17.0
csize_lattime = 4004
ahc0: aic7880 Single Channel A, SCSI Id=7, 16/255 SCBs
sa0 at ahc0 bus 0 target 4 lun 0
sa0: <ARCHIVE Python 28388-XXX 4AFA> Removable Sequential Access SCSI-2 device
da1 at ahc0 bus 0 target 1 lun 0
da1: <iomega jaz 1GB H.62> Removable Direct Access SCSI-2 device
da0 at ahc0 bus 0 target 0 lun 0
da0: <SEAGATE ST11910N 8044> Fixed Direct Access SCSI-2 device
changing root device to da0s2a
cd0 at ahc0 bus 0 target 2 lun 0
cd0: <SONY CD-ROM CDU-76S 1.1c> Removable CD-ROM SCSI-2 device
>Description:
Running the command hangs indefinitely. X becomes unusable (mouse and
keyboard freeze). Logins on other vty's take dozens of seconds. After about
60 seconds, the following messages get printed:
Jan 13 13:24:58 grey /kernel: (probe0:ahc0:0:8:0): SCB 0x13 - timed out in datain phase, SEQADDR == 0x10b
Jan 13 13:25:01 grey /kernel: (probe0:ahc0:0:8:0): BDR message in message buffer
Jan 13 13:25:01 grey /kernel: (probe0:ahc0:0:8:0): SCB 0x13 - timed out in datain phase, SEQADDR == 0x10b
Jan 13 13:25:01 grey /kernel: (probe0:ahc0:0:8:0): no longer in timeout, status = 34b
Jan 13 13:25:01 grey /kernel: ahc0: Issued Channel A Bus Reset. 11 SCBs aborted
>How-To-Repeat:
Run "camcontrol rescan 0:8:0" on a bus that doesn't have an 8th device.
>Fix:
Take the spoon out of the cup. (-:
>Release-Note:
>Audit-Trail:
>Unformatted:
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