Messages in this thread | | | Date | Fri, 21 Feb 2014 01:30:53 -0500 | From | Sasha Levin <> | Subject | Re: [PATCH 11/11] mempolicy: apply page table walker on queue_pages_range() |
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On 02/10/2014 04:44 PM, Naoya Horiguchi wrote: > queue_pages_range() does page table walking in its own way now, > so this patch rewrites it with walk_page_range(). > One difficulty was that queue_pages_range() needed to check vmas > to determine whether we queue pages from a given vma or skip it. > Now we have test_walk() callback in mm_walk for that purpose, > so we can do the replacement cleanly. queue_pages_test_walk() > depends on not only the current vma but also the previous one, > so we use queue_pages->prev to keep it. > > ChangeLog v2: > - rebase onto mmots > - add VM_PFNMAP check on queue_pages_test_walk() > > Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> > ---
Hi Naoya,
I'm seeing another spew in today's -next, and it seems to be related to this patch. Here's the spew (with line numbers instead of kernel addresses):
[ 1411.889835] kernel BUG at mm/hugetlb.c:3580! [ 1411.890108] invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC [ 1411.890468] Dumping ftrace buffer: [ 1411.890468] (ftrace buffer empty) [ 1411.890468] Modules linked in: [ 1411.890468] CPU: 0 PID: 2653 Comm: trinity-c285 Tainted: G W 3.14.0-rc3-next-20140220-sasha-00008-gab7e7ac-dirty #113 [ 1411.890468] task: ffff8801be0cb000 ti: ffff8801e471c000 task.ti: ffff8801e471c000 [ 1411.890468] RIP: 0010:[<mm/hugetlb.c:3580>] [<mm/hugetlb.c:3580>] isolate_huge_page+0x1c/0xb0 [ 1411.890468] RSP: 0018:ffff8801e471dae8 EFLAGS: 00010246 [ 1411.890468] RAX: ffff88012b900000 RBX: ffffea0000000000 RCX: 0000000000000000 [ 1411.890468] RDX: 0000000000000000 RSI: ffff8801be0cbd00 RDI: 0000000000000000 [ 1411.890468] RBP: ffff8801e471daf8 R08: 0000000000000000 R09: 0000000000000000 [ 1411.890468] R10: 0000000000000001 R11: 0000000000000001 R12: ffff8801e471dcf8 [ 1411.890468] R13: ffffffff87d39120 R14: ffff8801e471dbc8 R15: 00007f30b1800000 [ 1411.890468] FS: 00007f30b50bb700(0000) GS:ffff88012bc00000(0000) knlGS:0000000000000000 [ 1411.890468] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 1411.890468] CR2: 0000000001609a10 CR3: 00000001e4703000 CR4: 00000000000006f0 [ 1411.890468] Stack: [ 1411.890468] 00007f30b1000000 00007f30b0e00000 ffff8801e471db08 ffffffff812a8d71 [ 1411.890468] ffff8801e471db78 ffffffff81298fb1 00007f30b0d00000 ffff880478a16c38 [ 1411.890468] ffff8802291c6060 ffffffffffe00000 ffffffffffe00000 ffff8804fd7fa7d0 [ 1411.890468] Call Trace: [ 1411.890468] [<mm/mempolicy.c:540>] queue_pages_hugetlb+0x81/0x90 [ 1411.890468] [<include/linux/spinlock.h:343 mm/pagewalk.c:203>] walk_hugetlb_range+0x111/0x180 [ 1411.890468] [<mm/pagewalk.c:254>] __walk_page_range+0x25/0x40 [ 1411.890468] [<mm/pagewalk.c:332>] walk_page_range+0xf2/0x130 [ 1411.890468] [<mm/mempolicy.c:637>] queue_pages_range+0x6c/0x90 [ 1411.890468] [<mm/mempolicy.c:492>] ? queue_pages_hugetlb+0x90/0x90 [ 1411.890468] [<mm/mempolicy.c:521>] ? queue_pages_range+0x90/0x90 [ 1411.890468] [<mm/mempolicy.c:573>] ? change_prot_numa+0x30/0x30 [ 1411.890468] [<mm/mempolicy.c:1004>] migrate_to_node+0x77/0xc0 [ 1411.890468] [<mm/mempolicy.c:1110>] do_migrate_pages+0x1a8/0x230 [ 1411.890468] [<mm/mempolicy.c:1461>] SYSC_migrate_pages+0x316/0x380 [ 1411.890468] [<include/linux/rcupdate.h:799 mm/mempolicy.c:1407>] ? SYSC_migrate_pages+0xac/0x380 [ 1411.890468] [<kernel/sched/cputime.c:681>] ? vtime_account_user+0x91/0xa0 [ 1411.890468] [<mm/mempolicy.c:1381>] SyS_migrate_pages+0x9/0x10 [ 1411.890468] [<arch/x86/ia32/ia32entry.S:430>] ia32_do_call+0x13/0x13 [ 1411.890468] Code: 4c 8b 6d f8 c9 c3 66 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 54 49 89 f4 53 48 89 fb 48 8b 07 f6 c4 40 75 13 31 f6 e8 84 48 fb ff <0f> 0b 66 90 eb fe 66 0f 1f 44 00 00 8b 4f 1c 48 8d 77 1c 85 c9 [ 1411.890468] RIP [<mm/hugetlb.c:3580>] isolate_huge_page+0x1c/0xb0 [ 1411.890468] RSP <ffff8801e471dae8>
Thanks, Sasha
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