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Date:      Fri, 4 Apr 1997 07:50:02 -0800 (PST)
From:      Petr Lampa <lampa@fee.vutbr.cz>
To:        freebsd-bugs
Subject:   Re: i386/3195: ahc panic
Message-ID:  <199704041550.HAA14953@freefall.freebsd.org>

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The following reply was made to PR i386/3195; it has been noted by GNATS.

From: Petr Lampa <lampa@fee.vutbr.cz>
To: freebsd-gnats-submit@freebsd.org, luigi@iet.unipi.it
Cc:  Subject: Re: i386/3195: ahc panic
Date: Fri, 04 Apr 1997 17:47:07 +0200

 I have got similar problems on Adaptec 3940W and 3940U with
 2 disks per channel and FreeBSD-GAMME, FreeBSD-2.2, and 
 FreeBSD-2.2.1. System works only for several days (sometimes
 even hours) and then one of the following errors happens:
 
 no active SCB for reconnection target - issuing ABORT
 SAVED_TCL == 0x0 (0x10)
 SCB 0x3 - timed out in message in phase, SCSISIGI == 0xf4
 SEQADDR == 0x42
 Yucky Immediate reset. Flags == 0x1
 
 OR
 
 SCB 0x1 timed out in datain phase, SCSISIGI == 0x44
 SEQADDR == 0x126
 abort message in message buff
 SCB 0x3 timed out in datain phase, SCSISIGI == 0x54
 
 and system hangs. When I activate kernel debugger, trace
 is always:
 
 ahc_scsi_cmd()
 sdstart()
 free_xs()
 scsi_done()
 ahc_done()
 ahc_run_done_queue()
 ahc_reset_channel()
 ahc_timeout()
 
 This looks like bus reset never succeeds and loops forever.
 Both systems were running 2.1.6 without problems for months.
 AHC driver is compiled without any options (no tag queueing,
 no memio, no scb paging).
 
 						Petr Lampa



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