[Bug 237261] Boot stuck in endless ATAPI_IDENTIFY attempts

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237261

Andriy Gapon <avg at FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|bugs at FreeBSD.org            |scsi at FreeBSD.org

--- Comment #6 from Andriy Gapon <avg at FreeBSD.org> ---
(In reply to Mikhail Teterin from comment #5)
Thank you!
So, we can see that the old stack also sees the phantom device, tries to
identify it and fails.  But I guess that that happens rather quickly (?) and,
certainly, there are no endless retries.  That seems to be the main difference
between the old code and the new one.

I would try to draw attention of CAM experts like Scott Long or Alexander Motin
or Kenneth Merry to this bug.  I'll re-assign this bug to scsi@ as well.

Here are the relevant bits from the log:
ata1: <ATA channel 1> on atapci0
ata1: reset tp1 mask=03 ostat0=50 ostat1=00
ata1: stat0=0x00 err=0x01 lsb=0x14 msb=0xeb
ata1: stat1=0x00 err=0x01 lsb=0x14 msb=0xeb
ata1: reset tp2 stat0=00 stat1=00 devices=0x30000
ata1: Identifying devices: 00030000
ata1: New devices: 00030000
ata1: reiniting channel ..
ata1: reset tp1 mask=03 ostat0=00 ostat1=00
ata1: stat0=0x00 err=0x01 lsb=0x14 msb=0xeb
ata1: stat1=0x00 err=0x01 lsb=0x14 msb=0xeb
ata1: reset tp2 stat0=00 stat1=00 devices=0x30000
ata1: reinit done ..
unknown: FAILURE - ATAPI_IDENTIFY timed out LBA=0
ata1: reiniting channel ..
ata1: reset tp1 mask=03 ostat0=00 ostat1=00
ata1: stat0=0x00 err=0x01 lsb=0x14 msb=0xeb
ata1: stat1=0x00 err=0x01 lsb=0x14 msb=0xeb
ata1: reset tp2 stat0=00 stat1=00 devices=0x30000
ata1: reinit done ..
unknown: FAILURE - ATAPI_IDENTIFY timed out LBA=0

And then success for the real device:
ata1-master: pio=PIO4 wdma=WDMA2 udma=UDMA33 cable=40 wire
acd0: setting UDMA33
acd0: <UJDA755 DVD/CDRW/1.00> CDRW drive at ata1 as master

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