I updated the "ThinkCenter" to 15-BETA2-p1 and made some experiments
and I get different results now than before.
This is obviously without the fix.
Now I see 25 read(2)'s return EIO before ENXIO arrives.
Each of those 25 read(2)'s do:
read(2) syscall
all the way down to CAM
for 4(?) retries:
CAM sends CCB down
CAM gets CCB back with error
CAM printf's two lines to console
CAM returns EIO
userland gets EIO
userland printf's to stdout (=console)
And only then does ENXIO finally appear.
This is single-user mode with a random old USB stick.
i915kms does not seem to affect the result in this experiment.
I'm buildLLVM'ing on my laptop, will perform more experiments
on that platform once that is complete
Poul-Henning
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
[email protected] | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
