kernel test robot <xiaolong...@intel.com> writes: > FYI, we noticed the following commit: > > https://github.com/0day-ci/linux > Aneesh-Kumar-K-V/mm-Use-the-correct-page-size-when-removing-the-page/20161012-013446 > commit c4344e80359420d7574b3b90fddf53311f1d24e6 ("mm: Remove the page size > change check in tlb_remove_page") > > in testcase: boot > > on test machine: qemu-system-i386 -enable-kvm -cpu Haswell,+smep,+smap -m 360M > > caused below changes: > > > +------------------------------------------------+------------+------------+ > | | eff764128d | c4344e8035 | > +------------------------------------------------+------------+------------+ > | boot_successes | 59 | 0 | > | boot_failures | 0 | 43 | > | WARNING:at_mm/memory.c:#__tlb_remove_page_size | 0 | 43 | > | calltrace:SyS_execve | 0 | 43 | > | calltrace:run_init_process | 0 | 21 | > +------------------------------------------------+------------+------------+ > > > > [ 4.096204] Write protecting the kernel text: 3148k > [ 4.096911] Write protecting the kernel read-only data: 1444k > [ 4.120357] ------------[ cut here ]------------ > [ 4.121078] WARNING: CPU: 0 PID: 101 at mm/memory.c:303 > __tlb_remove_page_size+0x25/0x99 > [ 4.122380] Modules linked in: > [ 4.122788] CPU: 0 PID: 101 Comm: run-parts Not tainted > 4.8.0-mm1-00315-gc4344e8 #5 > [ 4.123956] bd145dc4 b111e5e6 bd145de0 b10320dc 0000012f b10974d1 > bd145e70 c4954170 > [ 4.125277] c4954170 bd145df4 b103215f 00000009 00000000 00000000 > bd145e04 b10974d1 > [ 4.126424] c4954170 bd145e70 bd145e14 b10263ca bd145e70 bd47bafc > bd145e40 b109767a > [ 4.127622] Call Trace:
Thanks for the report. The below change should fix this. commit 18c929e7cf672da617dc218c6265366bf78b1644 Author: Aneesh Kumar K.V <aneesh.ku...@linux.vnet.ibm.com> Date: Wed Oct 12 08:40:41 2016 +0530 update mmu gather page size before flushing page table cache diff --git a/mm/memory.c b/mm/memory.c index 26d1ba8c87e6..7e7eccb82a2b 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -526,7 +526,11 @@ void free_pgd_range(struct mmu_gather *tlb, end -= PMD_SIZE; if (addr > end - 1) return; - + /* + * We add page table cache pages with PAGE_SIZE, + * (see pte_free_tlb()), flush the tlb if we need + */ + tlb_remove_check_page_size_change(tlb, PAGE_SIZE); pgd = pgd_offset(tlb->mm, addr); do { next = pgd_addr_end(addr, end);