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    Subjectslub freelist issue / BUG: unable to handle page fault for address: 000000003ffe0018
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    Hi all,

    I ran into a boot problem with latest linus/master
    (6929f71e46bdddbf1c4d67c2728648176c67c555) that manifests like this:

    hpet0: 3 comparators, 64-bit 100.000000 MHz counter
    clocksource: Switched to clocksource tsc-early
    BUG: unable to handle page fault for address: 000000003ffe0018
    #PF: supervisor read access in kernel mode
    #PF: error_code(0x0000) - not-present page
    PGD 0 P4D 0
    Oops: 0000 [#1] SMP PTI
    CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.6.0+ #211
    Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
    Ubuntu-1.8.2-1ubuntu1 04/01/2014
    RIP: 0010:kmem_cache_alloc+0x70/0x1d0
    Code: 00 00 4c 8b 45 00 65 49 8b 50 08 65 4c 03 05 6f cc e7 7e 4d 8b 20
    4d 85 e4 0f 84 3d 01 00 00 8b 45 20 48 8b 7d 00 48 8d 4a 01 <49> 8b 1c
    04 4c 89 e0 65 48 0f c7 0f 0f 94 c0 84 c0 74 c5 8b 45 20
    RSP: 0000:ffffc90000013df8 EFLAGS: 00010206
    RAX: 0000000000000018 RBX: ffffffff81c49200 RCX: 0000000000000002
    RDX: 0000000000000001 RSI: 0000000000000dc0 RDI: 000000000002b300
    RBP: ffff88803e403d00 R08: ffff88803ec2b300 R09: 0000000000000001
    R10: 0000000000000dc0 R11: 0000000000000006 R12: 000000003ffe0000
    R13: ffffffff8110a583 R14: 0000000000000dc0 R15: ffffffff81c49a80
    FS: 0000000000000000(0000) GS:ffff88803ec00000(0000) knlGS:0000000000000000
    CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 000000003ffe0018 CR3: 0000000001c0a001 CR4: 00000000003606f0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
    Call Trace:
    __trace_define_field+0x33/0xa0
    event_trace_init+0xeb/0x2b4
    tracer_init_tracefs+0x60/0x195
    ? register_tracer+0x1e7/0x1e7
    do_one_initcall+0x74/0x160
    kernel_init_freeable+0x190/0x1f0
    ? rest_init+0x9a/0x9a
    kernel_init+0x5/0xf6
    ret_from_fork+0x35/0x40
    CR2: 000000003ffe0018
    ---[ end trace 707efa023f2ee960 ]---
    RIP: 0010:kmem_cache_alloc+0x70/0x1d0

    Bisection gives me:

    commit 3202fa62fb43087387c65bfa9c100feffac74aa6
    Author: Kees Cook <keescook@chromium.org>
    Date: Wed Apr 1 21:04:27 2020 -0700

    slub: relocate freelist pointer to middle of object

    Reverting these three commits fixes it:

    3202fa62fb43087387c65bfa9c100feffac74aa6 slub: relocate freelist pointer
    to middle of object
    89b83f282d8ba380cf2124f88106c57df49c538c slub: avoid redzone when
    choosing freepointer location
    cbfc35a48609ceac978791e3ab9dde0c01f8cb20 mm/slub: fix incorrect
    interpretation of s->offset


    Vegard

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