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    SubjectRe: x86: bad pte in pageattr_test
    On Mon, Apr 11, 2016 at 10:28 AM, Dmitry Vyukov <dvyukov@google.com> wrote:
    > Hello,
    >
    > I've got the following WARNING while running syzkaller fuzzer:
    >
    > CPA ffff880054118000: bad pte after revert 8000000054118363
    > ------------[ cut here ]------------
    > WARNING: CPU: 2 PID: 1503 at arch/x86/mm/pageattr-test.c:226
    > pageattr_test+0xa6c/0xd10
    > NOT PASSED. Please report.
    > Modules linked in:
    > CPU: 2 PID: 1503 Comm: pageattr-test Not tainted 4.6.0-rc2+ #346
    > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
    > ffffffff87eb25c0 ffff88003b627a70 ffffffff82c8b17f ffffffff81490b58
    > fffffbfff0fd64b8 ffff88003b627ae8 0000000000000000 ffffffff86a77e00
    > ffffffff8129487c 0000000000000009 ffff88003b627ab8 ffffffff8136639f
    > Call Trace:
    > [< inline >] __dump_stack lib/dump_stack.c:15
    > [<ffffffff82c8b17f>] dump_stack+0x12e/0x18f lib/dump_stack.c:51
    > [<ffffffff8136639f>] __warn+0x19f/0x1e0 kernel/panic.c:512
    > [<ffffffff8136648c>] warn_slowpath_fmt+0xac/0xd0 kernel/panic.c:527
    > [<ffffffff8129487c>] pageattr_test+0xa6c/0xd10 arch/x86/mm/pageattr-test.c:226
    > [<ffffffff81294b3b>] do_pageattr_test+0x1b/0x60 arch/x86/mm/pageattr-test.c:240
    > [<ffffffff813cde7f>] kthread+0x23f/0x2d0 drivers/block/aoe/aoecmd.c:1303
    > [<ffffffff867b6252>] ret_from_fork+0x22/0x50 arch/x86/entry/entry_64.S:392
    > ---[ end trace e669a8d69b836be8 ]---
    >
    > Unfortunately it is not reproducible, tried bumping checking frequency to 1.
    >
    > On commit 541d8f4d59d79f5d37c8c726f723d42ff307db57 (Apr 5).
    >
    > For the repcord, full syzkaller log:
    > https://gist.githubusercontent.com/dvyukov/323ff7275c5ac38156cb40caeacac057/raw/0836f8dd81024e441f81caebdcb73ca1221aef97/gistfile1.txt


    Ping.

    Hit it again on af8c34ce6ae32addda3788d54a7e340cad22516b (4.7-rc2)

    CPA ffff880059990000: bad pte 8000000059990060
    ------------[ cut here ]------------
    WARNING: CPU: 1 PID: 1602 at arch/x86/mm/pageattr-test.c:226[<
    none >] pageattr_test+0xa6f/0xd10 arch/x86/mm/pageattr-test.c:226
    NOT PASSED. Please report.
    Modules linked in:
    CPU: 1 PID: 1602 Comm: pageattr-test Not tainted 4.7.0-rc2+ #2
    Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
    ffffffff880b59e0 ffff88003a41fa70 ffffffff82cc5e2f ffffffff81495ed8
    fffffbfff1016b3c ffff88003a41fae8 0000000000000000 ffffffff86c7a060
    ffffffff8129ac8f 0000000000000009 ffff88003a41fab8 ffffffff8136d23f
    Call Trace:
    [< inline >] __dump_stack lib/dump_stack.c:15
    [<ffffffff82cc5e2f>] dump_stack+0x12e/0x18f lib/dump_stack.c:51
    [<ffffffff8136d23f>] __warn+0x19f/0x1e0 kernel/panic.c:516
    [<ffffffff8136d32c>] warn_slowpath_fmt+0xac/0xd0 kernel/panic.c:531
    [<ffffffff8129ac8f>] pageattr_test+0xa6f/0xd10 arch/x86/mm/pageattr-test.c:226
    [<ffffffff8129af4b>] do_pageattr_test+0x1b/0x60 arch/x86/mm/pageattr-test.c:240
    [<ffffffff813d58df>] kthread+0x23f/0x2d0 drivers/block/aoe/aoecmd.c:1303
    [<ffffffff86a8da0f>] ret_from_fork+0x1f/0x40 arch/x86/entry/entry_64.S:389
    ---[ end trace 1e5de26a2555fc00 ]---

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