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From: Linus Torvalds <torvalds@linux-foundation.org>
To: Tim Chen <tim.c.chen@linux.intel.com>,
	"Huang, Ying" <ying.huang@intel.com>,
	Michal Hocko <mhocko@suse.com>,
	Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm <linux-mm@kvack.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: kernel BUG at mm/swap_slots.c:270
Date: Sat, 18 Mar 2017 09:57:18 -0700	[thread overview]
Message-ID: <CA+55aFyq++yzU6bthhy1eDebkaAiXnH6YXHCTNzsC2-KZqN=Pw@mail.gmail.com> (raw)

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

WARNING: multiple messages have this Message-ID (diff)
From: Linus Torvalds <torvalds@linux-foundation.org>
To: Tim Chen <tim.c.chen@linux.intel.com>,
	"Huang, Ying" <ying.huang@intel.com>,
	Michal Hocko <mhocko@suse.com>,
	Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm <linux-mm@kvack.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: kernel BUG at mm/swap_slots.c:270
Date: Sat, 18 Mar 2017 09:57:18 -0700	[thread overview]
Message-ID: <CA+55aFyq++yzU6bthhy1eDebkaAiXnH6YXHCTNzsC2-KZqN=Pw@mail.gmail.com> (raw)

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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             reply	other threads:[~2017-03-18 17:59 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-03-18 16:57 Linus Torvalds [this message]
2017-03-18 16:57 ` kernel BUG at mm/swap_slots.c:270 Linus Torvalds
2017-03-19 14:04 ` Michal Hocko
2017-03-19 14:04   ` Michal Hocko
2017-03-20  1:25   ` Huang, Ying
2017-03-20  1:25     ` Huang, Ying
2017-03-20 14:15     ` Tim Chen
2017-03-20 14:15       ` Tim Chen

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