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Date: Sat, 8 Apr 2017 03:18:35 +0000
From: alexander.levin@...izon.com
To: Minchan Kim <minchan@...nel.org>
CC: Andrew Morton <akpm@...ux-foundation.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-mm@...ck.org" <linux-mm@...ck.org>,
"kernel-team@....com" <kernel-team@....com>,
Johannes Weiner <hannes@...xchg.org>,
Michal Hocko <mhocko@...e.com>,
"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
Anshuman Khandual <khandual@...ux.vnet.ibm.com>,
Vlastimil Babka <vbabka@...e.cz>
Subject: Re: [PATCH v2 04/10] mm: make the try_to_munlock void function
On Wed, Mar 15, 2017 at 02:24:47PM +0900, Minchan Kim wrote:
> try_to_munlock returns SWAP_MLOCK if the one of VMAs mapped
> the page has VM_LOCKED flag. In that time, VM set PG_mlocked to
> the page if the page is not pte-mapped THP which cannot be
> mlocked, either.
>
> With that, __munlock_isolated_page can use PageMlocked to check
> whether try_to_munlock is successful or not without relying on
> try_to_munlock's retval. It helps to make try_to_unmap/try_to_unmap_one
> simple with upcoming patches.
>
> Cc: Vlastimil Babka <vbabka@...e.cz>
> Acked-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Signed-off-by: Minchan Kim <minchan@...nel.org>
Hey Minchan,
I seem to be hitting one of those newly added BUG_ONs with trinity:
[ 21.017404] page:ffffea000307a300 count:10 mapcount:7 mapping:ffff88010083f3a8 index:0x131
[ 21.019974] flags: 0x1fffc00001c001d(locked|referenced|uptodate|dirty|swapbacked|unevictable|mlocked) [ 21.022806] raw: 01fffc00001c001d ffff88010083f3a8 0000000000000131 0000000a00000006 [ 21.023974] raw: dead000000000100 dead000000000200 0000000000000000 ffff880109838008
[ 21.026098] page dumped because: VM_BUG_ON_PAGE(PageMlocked(page))
[ 21.026903] page->mem_cgroup:ffff880109838008 [ 21.027505] page allocated via order 0, migratetype Movable, gfp_mask 0x14200ca(GFP_HIGHUSER_MOVABLE)
[ 21.028783] save_stack_trace (arch/x86/kernel/stacktrace.c:60)
[ 21.029362] save_stack (./arch/x86/include/asm/current.h:14 mm/kasan/kasan.c:50) [ 21.029859] __set_page_owner (mm/page_owner.c:178) [ 21.030414] get_page_from_freelist (./include/linux/page_owner.h:30 mm/page_alloc.c:1742 mm/page_alloc.c:1750 mm/page_alloc.c:3097) [ 21.031071] __alloc_pages_nodemask (mm/page_alloc.c:4011) [ 21.031716] alloc_pages_vma (./include/linux/mempolicy.h:77 ./include/linux/mempolicy.h:82 mm/mempolicy.c:2024) [ 21.032307] shmem_alloc_page (mm/shmem.c:1389 mm/shmem.c:1444) [ 21.032881] shmem_getpage_gfp (mm/shmem.c:1474 mm/shmem.c:1753) [ 21.033488] shmem_fault (mm/shmem.c:1987) [ 21.034055] __do_fault (mm/memory.c:3012) [ 21.034568] __handle_mm_fault (mm/memory.c:3449 mm/memory.c:3497 mm/memory.c:3723 mm/memory.c:3841) [ 21.035192] handle_mm_fault (mm/memory.c:3878) [ 21.035772] __do_page_fault (arch/x86/mm/fault.c:1446) [ 21.037148] do_page_fault (arch/x86/mm/fault.c:1508 ./include/linux/context_tracking_state.h:30 ./include/linux/context_tracking.h:63 arch/x86/mm/fault.c:1509)
[ 21.037657] do_async_page_fault (./arch/x86/include/asm/traps.h:82 arch/x86/kernel/kvm.c:264)
[ 21.038266] async_page_fault (arch/x86/entry/entry_64.S:1011)
[ 21.038901] ------------[ cut here ]------------
[ 21.039546] kernel BUG at mm/rmap.c:1560!
[ 21.040126] invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN
[ 21.040910] Modules linked in:
[ 21.041345] CPU: 6 PID: 1317 Comm: trinity-c62 Tainted: G W 4.11.0-rc5-next-20170407 #7
[ 21.042761] task: ffff8801067d3e40 task.stack: ffff8800c06d0000
[ 21.043572] RIP: 0010:try_to_munlock (??:?)
[ 21.044639] RSP: 0018:ffff8800c06d71a0 EFLAGS: 00010296
[ 21.045330] RAX: 0000000000000000 RBX: 1ffff100180dae36 RCX: 0000000000000000
[ 21.046289] RDX: 0000000000000000 RSI: 0000000000000086 RDI: ffffed00180dae28
[ 21.047225] RBP: ffff8800c06d7358 R08: 0000000000001639 R09: 6c7561665f656761
[ 21.048982] R10: ffffea000307a31c R11: 303378302f383278 R12: ffff8800c06d7330
[ 21.049823] R13: ffffea000307a300 R14: ffff8800c06d72d0 R15: ffffea000307a300
[ 21.050647] FS: 00007f4ab05a7700(0000) GS:ffff880109d80000(0000) knlGS:0000000000000000
[ 21.051574] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 21.052246] CR2: 00007f4aafdebfc0 CR3: 00000000c069f000 CR4: 00000000000406a0
[ 21.053072] Call Trace:
[ 21.061057] __munlock_isolated_page (mm/mlock.c:131)
[ 21.065328] __munlock_pagevec (mm/mlock.c:339)
[ 21.079191] munlock_vma_pages_range (mm/mlock.c:494)
[ 21.085665] mlock_fixup (mm/mlock.c:569)
[ 21.086205] apply_vma_lock_flags (mm/mlock.c:608)
[ 21.089035] SyS_munlock (./arch/x86/include/asm/current.h:14 mm/mlock.c:739 mm/mlock.c:729)
[ 21.089502] do_syscall_64 (arch/x86/entry/common.c:284)
--
Thanks,
Sasha
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