linux-kernel - kernel BUG at mm/swap

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Message-ID: <CA+55aFyq++yzU6bthhy1eDebkaAiXnH6YXHCTNzsC2-KZqN=Pw@mail.gmail.com>
Date:   Sat, 18 Mar 2017 09:57:18 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Tim Chen <tim.c.chen@...ux.intel.com>,
        "Huang, Ying" <ying.huang@...el.com>,
        Michal Hocko <mhocko@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: kernel 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