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    SubjectRe: Oops with DCACHE_WORD_ACCESS and ocfs2, autofs4
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    Hello,

    > Jana - never mind that patch. It will avoid the page fault, but try to
    > use the wrong (truncated) name due to the extraneous left-shift of the
    > loaded value.
    >
    > So use the attached one instead. It just removes the extra shift that
    > Peter noticed, and also allows the use of the word-at-a-time code with
    > DEBUG_PAGEALLOC so that I can test it myself too.

    Ok, I have been running with that patch for slightly over an hour and
    didn't get that oops anymore.

    Instead, now I got an oops on __d_lookup (fs/dcache.c line 155) (kernel
    log excerpt below):

    > #ifdef CONFIG_DCACHE_WORD_ACCESS
    > unsigned long a,b,mask;
    >
    > if (unlikely(scount != tcount))
    > return 1;
    >
    > for (;;) {
    > a = *(unsigned long *)cs;
    > -> b = *(unsigned long *)ct;
    > if (tcount < sizeof(unsigned long))
    > break;

    Similar issue, ct is pointing at 0xffff880115a59ffb

    Jana


    BUG: unable to handle kernel paging request at ffff880115a5a000
    IP: [<ffffffff81146850>] __d_lookup+0xe0/0x170
    PGD 180c067 PUD bf3f4067 PMD bf4a2067 PTE 0
    Oops: 0000 [#1] PREEMPT SMP
    CPU 0
    Modules linked in: nfs lockd auth_rpcgss nfs_acl sunrpc autofs4 ocfs2
    jbd2 ocfs2_dlmfs ocfs2_stack_o2cb ocfs2_dlm ocfs2_nodemanager
    ocfs2_stackglue configfs

    Pid: 10310, comm: apache2 Not tainted 3.4.0-js1-test #1
    RIP: e030:[<ffffffff81146850>] [<ffffffff81146850>] __d_lookup
    +0xe0/0x170
    RSP: e02b:ffff880095cc9bf8 EFLAGS: 00010293
    RAX: 0000000000006461 RBX: ffff88009d3ef248 RCX: 0000000000000002
    RDX: 0000000000000006 RSI: 0000000000000000 RDI: ffff88009d3ef29c
    RBP: 0000000000007374 R08: 0000000000000002 R09: ffff88009d3ef278
    R10: ffff88009d3ef240 R11: 0000000000000000 R12: ffff88009d3ef29c
    R13: ffff880065148e40 R14: ffff880115a59ffb R15: ffff880095cc9e78
    FS: 00007fcb26ffe6d0(0000) GS:ffff8800bff0c000(0000)
    knlGS:0000000000000000
    CS: e033 DS: 0000 ES: 0000 CR0: 000000008005003b
    CR2: ffff880115a5a000 CR3: 0000000095cc2000 CR4: 0000000000000660
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
    Process apache2 (pid: 10310, threadinfo ffff880095cc8000, task
    ffff8800b3de1800)
    Stack:
    ffffffff814268da 000000000000e030 0000000000010257 0000000000000002
    000000000000e02b ffff880095cc9d10 ffff880095cc9d40 ffff880095cc9e68
    0000000000000001 0000000000000000 ffff8800b3de1800 ffffffff8113c135
    Call Trace:
    [<ffffffff814268da>] ? bad_gs+0xa34/0x197a
    [<ffffffff8113c135>] ? do_lookup+0x165/0x340
    [<ffffffff8113c7ba>] ? link_path_walk+0x4aa/0x890
    [<ffffffff81036c52>] ? pvclock_clocksource_read+0x52/0xf0
    [<ffffffff8113cd02>] ? path_lookupat+0x52/0x740
    [<ffffffff8104bad1>] ? sys_gettimeofday+0x31/0x80
    [<ffffffff8101a2eb>] ? emulate_vsyscall+0x31b/0x350
    [<ffffffff8113d41c>] ? do_path_lookup+0x2c/0xc0
    [<ffffffff8113aa2d>] ? getname_flags+0xed/0x260
    [<ffffffff8113ebde>] ? user_path_at_empty+0x5e/0xb0
    [<ffffffff8104c912>] ? local_bh_enable_ip+0x22/0xb0
    [<ffffffff81325eeb>] ? sock_setsockopt+0x8b/0x870
    [<ffffffff8112e981>] ? sys_faccessat+0xa1/0x1c0
    [<ffffffff814241f9>] ? system_call_fastpath+0x16/0x1b
    Code: 8d 53 f8 44 8b 43 1c 4c 8b 4b 20 75 4e 48 8b 4c 24 18 4d 63 c0 4c
    39 c1 75 b0 31 f6 0f 1f 80 00 00 00 00 48 83 f9 07 49 8b 04 31 <49> 8b
    14 36 76 5a 48 39 d0 75 94 48 83 c6 08 48 83 e9 08 75 e3
    RIP [<ffffffff81146850>] __d_lookup+0xe0/0x170
    RSP <ffff880095cc9bf8>
    CR2: ffff880115a5a000
    ---[ end trace b53471b6e52caa9d ]---

    (followed by note: apache2[10310] exited with preempt_count 1
    BUG: scheduling while atomic: apache2/10310/0x10000002)




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