And here is a disassembly of a locally-built siphash24_compress, built
using the same toolchain as was used for building systemd, which I have
been unable to get to crash with unaligned input.

The code is identical with only differences in the addresses, except for
this rather surprising bit at the end:

 nop
-andeq  r12, r1, r10, lsr #16
-muleq  r1, r4, r9
-andeq  r7, r1, lr, lsr #19
+andeq  r2, r0, r10, ror #25
+               ; <UNDEFINED> instruction: 0x000017b0
+ldrdeq r1, [r0], -r6
 End of assembler dump.
 (gdb) 

Not sure what to make of that.  But the added ldrdeq is in the working
code, not the code that has crashes reported against it; so it doesn't
seem to be relevant.

** Attachment added: "siphash24_compress-working-disassembly.txt"
   
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1512323/+attachment/4519155/+files/siphash24_compress-working-disassembly.txt

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https://bugs.launchpad.net/bugs/1512323

Title:
  devices on devel-proposed/ubuntu do not boot with systemd 227-2ubuntu1

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