Subject: [merged] mm-mempolicy-fix-vma-in-new_vma_page.patch removed from -mm tree To: liwanp@xxxxxxxxxxxxxxxxxx,bob.liu@xxxxxxxxxx,davej@xxxxxxxxxx,n-horiguchi@xxxxxxxxxxxxx,sasha.levin@xxxxxxxxxx,mm-commits@xxxxxxxxxxxxxxx From: akpm@xxxxxxxxxxxxxxxxxxxx Date: Thu, 19 Dec 2013 11:54:05 -0800 The patch titled Subject: mm/mempolicy: fix !vma in new_vma_page() has been removed from the -mm tree. Its filename was mm-mempolicy-fix-vma-in-new_vma_page.patch This patch was dropped because it was merged into mainline or a subsystem tree ------------------------------------------------------ From: Wanpeng Li <liwanp@xxxxxxxxxxxxxxxxxx> Subject: mm/mempolicy: fix !vma in new_vma_page() BUG_ON(!vma) assumption is introduced by commit 0bf598d8 (mbind: add BUG_ON(!vma) in new_vma_page()), however, even if address = __vma_address(page, vma); and vma->start < address < vma->end; page_address_in_vma() may still return -EFAULT because of many other conditions in it. As a result the while loop in new_vma_page() may end with vma=NULL. This patch revert the commit and also fix the potential dereference NULL pointer reported by Dan. http://marc.info/?l=linux-mm&m=137689530323257&w=2 kernel BUG at mm/mempolicy.c:1204! invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC CPU: 3 PID: 7056 Comm: trinity-child3 Not tainted 3.13.0-rc3+ #2 task: ffff8801ca5295d0 ti: ffff88005ab20000 task.ti: ffff88005ab20000 RIP: 0010:[<ffffffff8119f200>] [<ffffffff8119f200>] new_vma_page+0x70/0x90 RSP: 0000:ffff88005ab21db0 EFLAGS: 00010246 RAX: fffffffffffffff2 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000008040075 RSI: ffff8801c3d74600 RDI: ffffea00079a8b80 RBP: ffff88005ab21dc8 R08: 0000000000000004 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: fffffffffffffff2 R13: ffffea00079a8b80 R14: 0000000000400000 R15: 0000000000400000 FS: 00007ff49c6f4740(0000) GS:ffff880244e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff49c68f994 CR3: 000000005a205000 CR4: 00000000001407e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffffea00079a8b80 ffffea00079a8bc0 ffffea00079a8ba0 ffff88005ab21e50 ffffffff811adc7a 0000000000000000 ffff8801ca5295d0 0000000464e224f8 0000000000000000 0000000000000002 0000000000000000 ffff88020ce75c00 Call Trace: [<ffffffff811adc7a>] migrate_pages+0x12a/0x850 [<ffffffff8119f190>] ? alloc_pages_vma+0x1b0/0x1b0 [<ffffffff8119fa13>] SYSC_mbind+0x513/0x6a0 [<ffffffff810aa7de>] ? lock_release_holdtime.part.29+0xee/0x170 [<ffffffff8119fbae>] SyS_mbind+0xe/0x10 [<ffffffff817626a9>] ia32_do_call+0x13/0x13 Code: 85 c0 75 2f 4c 89 e1 48 89 da 31 f6 bf da 00 02 00 65 44 8b 04 25 08 f7 1c 00 e8 ec fd ff ff 5b 41 5c 41 5d 5d c3 0f 1f 44 00 00 <0f> 0b 66 0f 1f 44 00 +00 4c 89 e6 48 89 df ba 01 00 00 00 e8 48 RIP [<ffffffff8119f200>] new_vma_page+0x70/0x90 RSP <ffff88005ab21db0> Signed-off-by: Wanpeng Li <liwanp@xxxxxxxxxxxxxxxxxx> Reported-by: Dave Jones <davej@xxxxxxxxxx> Reported-by: Sasha Levin <sasha.levin@xxxxxxxxxx> Reviewed-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx> Reviewed-by: Bob Liu <bob.liu@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/mempolicy.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff -puN mm/mempolicy.c~mm-mempolicy-fix-vma-in-new_vma_page mm/mempolicy.c --- a/mm/mempolicy.c~mm-mempolicy-fix-vma-in-new_vma_page +++ a/mm/mempolicy.c @@ -1197,14 +1197,16 @@ static struct page *new_vma_page(struct break; vma = vma->vm_next; } + + if (PageHuge(page)) { + if (vma) + return alloc_huge_page_noerr(vma, address, 1); + else + return NULL; + } /* - * queue_pages_range() confirms that @page belongs to some vma, - * so vma shouldn't be NULL. + * if !vma, alloc_page_vma() will use task or system default policy */ - BUG_ON(!vma); - - if (PageHuge(page)) - return alloc_huge_page_noerr(vma, address, 1); return alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma, address); } #else _ Patches currently in -mm which might be from liwanp@xxxxxxxxxxxxxxxxxx are origin.patch x86-get-pg_data_ts-memory-from-other-node.patch memblock-numa-introduce-flags-field-into-memblock.patch memblock-mem_hotplug-introduce-memblock_hotplug-flag-to-mark-hotpluggable-regions.patch memblock-make-memblock_set_node-support-different-memblock_type.patch acpi-numa-mem_hotplug-mark-hotpluggable-memory-in-memblock.patch acpi-numa-mem_hotplug-mark-all-nodes-the-kernel-resides-un-hotpluggable.patch memblock-mem_hotplug-make-memblock-skip-hotpluggable-regions-if-needed.patch x86-numa-acpi-memory-hotplug-make-movable_node-have-higher-priority.patch mm-hwpoison-add-to-hwpoison_inject.patch lib-show_memc-show-num_poisoned_pages-when-oom.patch mm-migrate-add-comment-about-permanent-failure-path.patch mm-migrate-correct-failure-handling-if-hugepage_migration_support.patch mm-migrate-remove-putback_lru_pages-fix-comment-on-putback_movable_pages.patch mm-migrate-remove-unused-function-fail_migrate_page.patch mm-documentation-remove-hopelessly-out-of-date-locking-doc.patch mm-remove-bug_on-from-mlock_vma_page.patch linux-next.patch mm-migratec-fix-set-cpupid-on-page-migration-twice-against-thp.patch mm-migratec-fix-setting-of-cpupid-on-page-migration-twice-against-normal-page.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html