Dear Mr Garzik,
I am currently having trouble with the new libata kernel subsystem (My
system broke after 2.6.21 I believe). After much fruitless googling
and trawling through the libata code (I am *no* kernel programmer!) I
took the serious, final step of bugging you.
Ten or so minutes after boot (long enough for my two IDE Sony DW-G120A
DVD writers to spin down) I start getting these error messages in my
kernel logs:
[ 6317.817041] ata4.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
[ 6317.817057] ata4.01: cmd a0/00:00:00:08:00/00:00:00:00:00/b0 tag 0
pio 16392 in
[ 6317.817058] cdb 4a 01 00 00 10 00 00 00 08 00 00 00 00 00 00 00
[ 6317.817059] res 40/00:03:00:00:00/00:00:00:00:00/a0 Emask
0x4 (timeout)
[ 6317.817064] ata4.01: status: { DRDY }
[ 6317.817087] ata4: soft resetting link
[ 6318.221356] ata4.00: configured for PIO0
[ 6318.253533] ata4.01: configured for PIO0
[ 6318.253567] ata4: EH complete
[ 6335.817039] ata4.00: qc timeout (cmd 0xa0)
[ 6335.817059] ata4.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
[ 6335.817069] ata4.00: cmd a0/00:00:00:00:00/00:00:00:00:00/a0 tag 0
[ 6335.817070] cdb 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 6335.817071] res 51/20:03:00:00:00/00:00:00:00:00/a0 Emask
0x5 (timeout)
ad nauseam.
(I am running kernel 2.6.27-11, amd64. I have also tried 2.6.29, and
the messages are the same)
My DVD writers then cease to function.
My initial thoughts are that my spun-down devices are taking too long
to respond to requests from the kernel. I braced myself and then dived
in to the icy waters of the kernel sources to see if there was a
timeout I could increase. However, there are several structs with
timeouts in libata-eh.c, and the last thing my poor kernel needs is a
moron like myself twiddling random constants.
Could you please let me know if you think I am on the right track? Or
maybe suggest a timeout to twiddle?
Many thanks, and many apologies for interrupting you.
Kind Regards,
Matt Grice
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