Sure, I went ahead and rebuilt it just using the bare exynos_defconfig
and adding XTS and ECB and no other changes.

No flags were used. No patches were used other than the 2 you
provided. Just the barest of bears, the barest of bones, the barest of
deserts, the barest of hairless cats.

I also wiped out the 4.10.1 modules directory and zImage and dtb
before copying them into place.
*****
[   16.280951] s5p-jpeg 11f60000.jpeg: Samsung S5P JPEG codec
[   16.327434] CPU: 3 PID: 115 Comm: irq/69-10830000 Not tainted 4.10.1-dirty #1
[   16.334527] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
[   16.340533] task: edc52d00 task.stack: edcc0000
[   16.345040] PC is at post_crypt+0x194/0x1a0 [xts]
[   16.349712] LR is at post_crypt+0x188/0x1a0 [xts]
[   16.354390] pc : [<bf182370>]    lr : [<bf182364>]    psr: 200d0113
[   16.354390] sp : edcc1ea8  ip : ed6f38f4  fp : 30702272
[   16.365838] r10: 8ee5436d  r9 : 00000000  r8 : ed6f3800
[   16.371023] r7 : 00000000  r6 : 00000400  r5 : 00000000  r4 : 00000000
[   16.377523] r3 : ef5ead22  r2 : 00000200  r1 : 00000200  r0 : 00000000
[   16.384024] Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
[   16.391128] Control: 10c5387d  Table: 6d6f806a  DAC: 00000051
[   16.396847] Process irq/69-10830000 (pid: 115, stack limit = 0xedcc0210)
[   16.403519] Stack: (0xedcc1ea8 to 0xedcc2000)
[   16.407853] 1ea0:                   c0c08304 ef5ead20 ecd69200
ef5ead20 ecd69200 ed6f39dc
[   16.416011] 1ec0: 00000400 00000000 00000000 00000400 00000000
c010f774 c0113bac 00000000
[   16.424156] 1ee0: 00000000 00000000 00000000 00000000 00000000
00000010 00000010 0000000f
[   16.432302] 1f00: ed6f3800 edcae3bc 0000000c edcae3e8 00000000
600d0113 ee889d5c bf182764
[   16.440447] 1f20: edcae390 c0566d84 00000000 00000001 edcacec0
eea14b00 00000000 eea14b00
[   16.448592] 1f40: edcacec0 c01651c4 eeb00528 c01651e0 edcc0000
edcacee4 00000000 c01654b4
[   16.456738] 1f60: 00000000 c01652b8 eeb00500 edcc0000 00000000
edcacf00 edcacec0 c0165388
[   16.464884] 1f80: eeb00528 c013673c edcc0000 edcacf00 c0136634
00000000 00000000 00000000
[   16.473029] 1fa0: 00000000 00000000 00000000 c0107778 00000000
00000000 00000000 00000000
[   16.481174] 1fc0: 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
[   16.489320] 1fe0: 00000000 00000000 00000000 00000000 00000013
00000000 00000000 00000000
[   16.497473] [<bf182370>] (post_crypt [xts]) from [<bf182764>]
(decrypt_done+0x4c/0x54 [xts])
[   16.505877] [<bf182764>] (decrypt_done [xts]) from [<c0566d84>]
(s5p_aes_interrupt+0x1bc/0x208)
[   16.514544] [<c0566d84>] (s5p_aes_interrupt) from [<c01651e0>]
(irq_thread_fn+0x1c/0x54)
[   16.522592] [<c01651e0>] (irq_thread_fn) from [<c01654b4>]
(irq_thread+0x12c/0x1e0)
[   16.530220] [<c01654b4>] (irq_thread) from [<c013673c>] (kthread+0x108/0x138)
[   16.537324] [<c013673c>] (kthread) from [<c0107778>]
(ret_from_fork+0x14/0x3c)
[   16.544514] Code: eb471ad2 e598c118 e58d0020 e1a04000 (e5906004)
[   16.550709] ---[ end trace 0e5ce4ea2ad2d7e2 ]---
[   16.555224] genirq: exiting task "irq/69-10830000" (115) is an
active IRQ thread (irq 69)
*****
I'm sure you could just copy my crypttab and fstab entries that is
shown in my first email.

On Fri, Mar 10, 2017 at 12:06 PM, Krzysztof Kozlowski <krzk@kernel.org> wrote:
> On Thu, Mar 09, 2017 at 05:16:35AM -0600, Nathan Royce wrote:
>> Gave it a try on 4.10.1, but still to no avail:
>
> (...)
>
>> Also for the sake of testing, I did not add any FLAGS for compilation this time.
>
> Damn, I am fixing bugs around but not the one you are hitting. Can you
> also check if exynos_defconfig (+XTS + any other needed setting sfor
> you) also has this issue?
>
> I want to reproduce it but my setup does not use cryptswap. Probably I
> will have to set it up.
>
> Best regards,
> Krzysztof
>