quoted

(Added linux-pci to CC)

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I run Gentoo Linux on my alphas, with latest git kernels for test. 
4.13.0 worked well on 3 alphas but 4.13.0-09217-g5969d1bb3082 hangs on 
boot on all 3 of them. Tried bisecting on PC164, got into unrelated 
stuff, so probably it does not trigger always. Retried bisecting on 
DS10L. On the first try I got that the same keel where I first saw bad 
was the culprit, another bisect led me to 
0e4c2eeb758a91e68b9eaf7a4bee9bd5ed97ff2b which looks more related.

This is how the crash looks on console:

 * Starting udev ...
starting version 225
 [ ok ]
 * Generating a rule to create a /dev/root symlink ...
 [ ok ]
 * Populating /dev with existing devices through uevents ...
 [ ok ]

halted CPU 0

halt code = 5
HALT instruction executed
PC = fffffc00009bf914
boot failure

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What else can I do to debug this?

Booting with debug ignore_loglevel I get also this:

[...]

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So maybe it is related pcspkr loading, or the just loaded libata or 
floppy...

removing libata modules and rebooting fixes it - so it seems to be 
loading of libata.

Can you please cherry-pick:

commit b1f9e5e355e9 ("ide: fix IRQ assignment for PCI bus order probing")

from mainline and let us know if that solves the issue ?

No, still breaks the same way (b1f9e5e355e9 patched on top of 
0e4c2eeb758a).

4.14.0-rc5-00095-g1c9fec470b81 was also still broken the same way (tried 
on Sunday).

-- 
Meelis Roos (mroos@linux.ee)