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Subjectkernel BUG at mm/swap_slots.c:270
Tim at al,
I got this on my desktop at shutdown:

------------[ cut here ]------------
kernel BUG at mm/swap_slots.c:270!
invalid opcode: 0000 [#1] SMP
CPU: 5 PID: 1745 Comm: (sd-pam) Not tainted 4.11.0-rc1-00243-g24c534bb161b #1
Hardware name: System manufacturer System Product Name/Z170-K, BIOS
1803 05/06/2016
RIP: 0010:free_swap_slot+0xba/0xd0
Call Trace:
swap_free+0x36/0x40
do_swap_page+0x360/0x6d0
__handle_mm_fault+0x880/0x1080
handle_mm_fault+0xd0/0x240
__do_page_fault+0x232/0x4d0
do_page_fault+0x20/0x70
page_fault+0x22/0x30
---[ end trace aefc9ede53e0ab21 ]---

so there seems to be something screwy in the new swap_slots code.

Any ideas? I'm not finding other reports of this, but I'm also not
seeing why it should BUG_ON(). The "use_swap_slot_cache" thing very
much checks whether swap_slot_cache_initialized has been set, so the
BUG_ON() just seems like garbage. But please take a look.

Linus

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