Date: Sun, 17 Sep 1995 19:48:54 +1000 From: Bruce Evans <bde@zeta.org.au> To: current@freebsd.org Subject: assorted cdrom driver and nfs bugs Message-ID: <199509170948.TAA08597@godzilla.zeta.org.au>
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I tried this to demonstrate a bug in the SCSI cdrom driver:
Mount a cdrom on cd0a. # OK.
Attempt to eject cdrom. # OK, this fails because of
locking.
dd if=/dev/rcd0a of=/dev/null count=1. # Peek at complementary device
# to demonstrate broken
# close().
Attempt to eject cdrom. # BUG, this succeeds.
All or almost all cdrom drivers have this bug. It is most easily fixed by
letting the slice driver keep track of opens.
Attempting to recover from this showed a bug in nfsv3:
Reload cdrom. # OK.
umount /dev/cd0a. # OK.
Mount cdrom on cd0a again. # OK.
Now on a client running nfsv3 with the cdrom nfs-mounted through all this:
df. # Panic (null pointer in
nfs_statfs()).
Reboot client. # OK
df. # Panic (as above).
Bruce
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