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Bug#906769: arm kernels fail to boot

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I can confirm this on several machines in the reproducible builds zoo,
running linux-image-4.9.0-8-armmp-lpae version 4.9.110-3+deb9u3.

What I've noticed is that machines running the "armmp" variant appear to
be unaffected, all of the systems that failed were running the
"armmp-lpae" variant.

Switching to linux-image-4.9.0-8-armmp kernel variant on an affected
system appears to workaround the issue, or downgrading to
linux-image-4.9.0-7-armmp-lpae.

One "armmp-lpae" system appears to have successfully booted, but gets
many kernel messages along these lines:

[   78.638348] INFO: rcu_sched detected stalls on CPUs/tasks:
[   78.642433]  0-...: (0 ticks this GP) idle)c/0/0 softirq96/1396 fqs=0
[   78.649321]  (detected by 2, tB04 jiffies, g(3, c(2, qA917)
[   78.655567] Task dump for CPU 0:
[   78.658770] swapper/0       R  running task        0     0      0 0x00000000
[   78.665844] rcu_sched kthread starved for 4207 jiffies! g283 c282 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x1
[   78.674972] rcu_sched       S    0     7      2 0x00000000
[   78.680506] [<c09283cc>] (__schedule) from [<c092894c>] (schedule+0x50/0xa8)
[   78.687501] [<c092894c>] (schedule) from [<c092bd50>] (schedule_timeout+0x1e0/0x464)
[   78.695231] [<c092bd50>] (schedule_timeout) from [<c02df870>] (rcu_gp_kthread+0x574/0x908)
[   78.703447] [<c02df870>] (rcu_gp_kthread) from [<c028b598>] (kthread+0x118/0x130)
[   78.710894] [<c028b598>] (kthread) from [<c0226da0>] (ret_from_fork+0x14/0x34)


live well,
  vagrant

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Bug#906769: arm kernels fail to boot Vagrant Cascadian <vagrant@debian.org> - 2018-08-21 00:30 +0200
  Bug#906769: arm kernels fail to boot Domenico Andreoli <cavok@debian.org> - 2018-08-21 14:30 +0200
  Bug#906769: arm kernels fail to boot Vagrant Cascadian <vagrant@debian.org> - 2018-08-21 18:50 +0200

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