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    SubjectRe: Linux 2.6.38-rc6
    From
    On Thu, Feb 24, 2011 at 6:37 PM, Linus Torvalds
    <torvalds@linux-foundation.org> wrote:
    > On Thu, Feb 24, 2011 at 5:20 AM, Anca Emanuel <anca.emanuel@gmail.com> wrote:
    >>>
    >>> Every boot?
    >>
    >> Yes.
    >>
    >>> And just out of interest, what happens if you don't have the vesafb
    >>> driver at all?
    >>
    >> I used 'e' option from grub, removed the 'set gfxpayload = $linux_gfx_mode'
    >> and it works.
    >>
    >> dmesg: http://pastebin.com/JAZsk4vD
    >
    > Hmm. So it definitely seems to be the hand-over.
    >
    > Does this patch make any difference? When we unregister the old
    > framebuffer, we still leave it in the registered_fb[] array, which
    > looks wrong. But it would also be interesting to hear if setting
    > CONFIG_SLUB_DEBUG_ON or CONFIG_DEBUG_PAGEALLOC makes any difference
    > (they'd help detect accesses to free'd data structures).
    >
    >                          Linus
    >
    drivers/video/fbmem.c | 1 +
    1 files changed, 1 insertions(+), 0 deletions(-)

    diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c
    index e2bf953..e8f8925 100644
    --- a/drivers/video/fbmem.c
    +++ b/drivers/video/fbmem.c
    @@ -1511,6 +1511,7 @@ void remove_conflicting_framebuffers(struct
    apertures_struct *a,
    "%s vs %s - removing generic driver\n",
    name, registered_fb[i]->fix.id);
    unregister_framebuffer(registered_fb[i]);
    + registered_fb[i] = NULL;
    }
    }
    }


    Tested the patch, and now I get this:
    dmesg: http://pastebin.com/ieMNrA7C

    [ 12.252328] BUG: unable to handle kernel NULL pointer dereference
    at 00000000000003b8
    [ 12.252342] IP: [<ffffffff81311178>] fb_mmap+0x58/0x1d0
    [ 12.252354] PGD 78e6c067 PUD 78e6d067 PMD 0
    [ 12.252360] Oops: 0000 [#1] SMP
    [ 12.252364] last sysfs file: /sys/module/snd/initstate
    [ 12.252370] CPU 0
    [ 12.252372] Modules linked in: nouveau(+) snd ttm drm_kms_helper
    psmouse serio_raw drm soundcore lp snd_page_alloc i2c_algo_bit video
    parport pata_marvell ahci r8169 libahci
    [ 12.252393]
    [ 12.252397] Pid: 244, comm: plymouthd Not tainted
    2.6.38-rc6-git3-patch-linus+ #2 MICRO-STAR INTERNATIONAL CO.,LTD
    MS-7360/MS-7360
    [ 12.252407] RIP: 0010:[<ffffffff81311178>] [<ffffffff81311178>]
    fb_mmap+0x58/0x1d0
    [ 12.252414] RSP: 0018:ffff880078e8fd88 EFLAGS: 00010293
    [ 12.252418] RAX: 00000000ffffffea RBX: ffff88007047d228 RCX: 0000000000000000
    [ 12.252423] RDX: 000fffffffffffff RSI: ffff88007047d228 RDI: ffff880078f5d840
    [ 12.252428] RBP: ffff880078e8fdc8 R08: 0000000000000000 R09: ffff88007047d228
    [ 12.252432] R10: ffff88006f9d9cf0 R11: ffff88006f9d9d28 R12: ffff880037363800
    [ 12.252437] R13: 0000000000000000 R14: 0000000000000000 R15: ffff88007047d228
    [ 12.252442] FS: 00007fb5fbaa4720(0000) GS:ffff88007fc00000(0000)
    knlGS:0000000000000000
    [ 12.252448] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    [ 12.252453] CR2: 00000000000003b8 CR3: 0000000078e6b000 CR4: 00000000000006f0
    [ 12.252458] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    [ 12.252463] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
    [ 12.252468] Process plymouthd (pid: 244, threadinfo
    ffff880078e8e000, task ffff88003737ad80)
    [ 12.252473] Stack:
    [ 12.252476] ffff880037363800 00000000000000b8 ffff880078e8fdd8
    ffffffffffffffea
    [ 12.252484] ffff880037363800 00000000000006bb 00000000006bb000
    ffff88007047d228
    [ 12.252491] ffff880078e8fe98 ffffffff81130543 ffff880078f5d840
    0000000000000000
    [ 12.252499] Call Trace:
    [ 12.252507] [<ffffffff81130543>] mmap_region+0x3c3/0x500
    [ 12.252514] [<ffffffff81010d7e>] ?
    arch_get_unmapped_area_topdown+0x1ce/0x2f0
    [ 12.252521] [<ffffffff811309c4>] do_mmap_pgoff+0x344/0x380
    [ 12.252528] [<ffffffff810524f1>] ? finish_task_switch+0x41/0xe0
    [ 12.252535] [<ffffffff815ac0c3>] ? schedule+0x403/0xa00
    [ 12.252541] [<ffffffff81130bfe>] sys_mmap_pgoff+0x1fe/0x230
    [ 12.252546] [<ffffffff810108c9>] sys_mmap+0x29/0x30
    [ 12.252551] [<ffffffff8100bf02>] system_call_fastpath+0x16/0x1b
    [ 12.252556] Code: ba ff ff ff ff ff ff 0f 00 48 89 f3 48 8b 40 30
    8b 80 b8 00 00 00 25 ff ff 0f 00 49 39 d6 4c 8b 2c c5 c0 cf aa 81 b8
    ea ff ff ff <4d> 8b bd b8 03 00 00 76 1f 48 8b 5d d8 4c 8b 65 e0 4c 8b
    6d e8
    [ 12.252603] RIP [<ffffffff81311178>] fb_mmap+0x58/0x1d0
    [ 12.252608] RSP <ffff880078e8fd88>
    [ 12.252611] CR2: 00000000000003b8
    [ 12.252616] ---[ end trace 381165bafe65d748 ]---
    --
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