---559023410-869693583-912452528=:12758
Content-Type: TEXT/PLAIN; CHARSET=US-ASCII
Content-ID: <Pine.GSO.3.96.981130200331.12758O@delta.ds2.pg.gda.pl>
Hi,
Almost every morning I arrive at my Alpha/Linux machine I see a nice Oops
on the console coming from `updatedb' being run at night. Well, it's not
a standard Oops as it looks like an unaligned access. But normal
unaligned accesses are emulated and not reported like this. So I presume,
the emulation fails due to protection checks -- almost the same symptoms
may be reproduced in user level -- when an unaligned access hits
unaccessible memory it's unalignment being reported and not the fact of
memory protection violation.
Anyway, attached there is a decoded (thanks for a great work, Keith
Owens) kernel report and an output of the relevant part of `objdump -S' of
scsi_proc.o (in case someone is interested what actually that nice Alpha
assembler code means) -- a series of caret (^) characters helps finding
the problematic opcode.
Here is the SCSI-related part of .config:
CONFIG_BLK_DEV_SD=y
CONFIG_CHR_DEV_ST=m
CONFIG_BLK_DEV_SR=m
CONFIG_BLK_DEV_SR_VENDOR=y
CONFIG_CHR_DEV_SG=m
CONFIG_SCSI_MULTI_LUN=y
CONFIG_SCSI_CONSTANTS=y
CONFIG_SCSI_LOGGING=y
CONFIG_SCSI_PPA=m
CONFIG_SCSI_PPA_HAVE_PEDANTIC=y
CONFIG_SCSI_IMM=m
CONFIG_SCSI_NCR53C8XX=y
CONFIG_SCSI_NCR53C8XX_DEFAULT_TAGS=0
CONFIG_SCSI_NCR53C8XX_MAX_TAGS=32
CONFIG_SCSI_NCR53C8XX_SYNC=40
Note that it happens when accessing a NCR-hosted hard disk.
The compiler version is: "gcc version egcs-2.91.57 19980901 (egcs-1.1
release)" -- it seems to be stable on Alpha -- unlike gcc 2.7.x it did not
yet proved it can produce bogus code for me here.
I may provide any further details if needed.
Maciej
-- + Maciej W. Rozycki, Technical University of Gdansk, Poland + +--------------------------------------------------------------+ + e-mail: macro@ds2.pg.gda.pl, PGP key available +---559023410-869693583-912452528=:12758 Content-Type: TEXT/PLAIN; CHARSET=US-ASCII; NAME="scsi_proc.0.ksymoops" Content-Transfer-Encoding: BASE64 Content-ID: <Pine.GSO.3.96.981130200208.12758L@delta.ds2.pg.gda.pl> Content-Description:
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