bin/106973: 'tar' cannot read own tape, but 'pax' can

[mjacob at freebsd.org]

>  http://www.math.austin.tx.us:/dds4-drive

This contains:

Jan 16 22:34:17 frak login: ROOT LOGIN (root) ON ttyv1
Jan 16 22:36:59 frak kernel: ahc1: Recovery Initiated
Jan 16 22:36:59 frak kernel: >>>>>>>>>>>>>>>>>> Dump Card State Begins 
<<<<<<<<<<<<<<<<<
Jan 16 22:36:59 frak kernel: ahc1: Dumping Card State while idle, at 
SEQADDR 0x8
Jan 16 22:36:59 frak kernel: Card was paused
Jan 16 22:36:59 frak kernel: ACCUM = 0x4, SINDEX = 0x67, DINDEX = 0x27, 
ARG_2 = 0x3
Jan 16 22:36:59 frak kernel: HCNT = 0x0 SCBPTR = 0x0
Jan 16 22:36:59 frak kernel: SCSIPHASE[0x0] SCSISIGI[0x0] ERROR[0x0
....

It looks like tar is tickling some bug with the adaptec HBA driver- all 
bets are off and it's nothing that the sa driver can do much about.

The only thing I could offer is to try and remote debug it.