Date: Sat, 26 Jul 2003 16:00:05 -0400 From: Don Bowman <don@sandvine.com> To: Don Bowman <don@sandvine.com>, "'freebsd-scsi@freebsd.org'" <freebsd-scsi@freebsd.org>, "'aic7xxx@freebsd.org'" <aic7xxx@freebsd.org> Subject: RE: AIC7902 w/ seagate U320 drive issue on releng-4 (and current) Message-ID: <FE045D4D9F7AED4CBFF1B3B813C8533702741FEA@mail.sandvine.com>
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> From: Don Bowman
... [scsi errors with seagate cheetah on supermicro with adaptec aic7902]
I sometimes then get a panic due to this KASSERT in
sys/ufs/ufs/ufs_readwrite.c:
/*
* We should only get non-zero b_resid when an I/O error
* has occurred, which should cause us to break above.
* However, if the short read did not cause an error,
* then we want to ensure that we do not uiomove bad
* or uninitialized data.
*
* XXX b_resid is only valid when an actual I/O has occured
* and may be incorrect if the buffer is B_CACHE or if the
* last op on the buffer was a failed write. This KASSERT
* is a precursor to removing it from the UFS code.
*/
KASSERT(bp->b_resid == 0, ("bp->b_resid != 0"));
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