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From: Pavel Ivanov <paivanof@gmail.com>
Date: Fri, 2 Sep 2011 23:08:36 -0400
Message-ID: <CAG1a4ruWCARq5NLXSDo9Hmc6i2d5XDeuwJTKEqyeOm20hcO66A@mail.gmail.com>
Subject: Kernel 3.1.0-rc4 oops when connecting iPod
To: linux-fsdevel@vger.kernel.org
Cc: linux-kernel <linux-kernel@vger.kernel.org>
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Hi,

With kernel 3.1.0-rc4 any attempt to connect iPod to USB leads to
kernel oops. I'd say that stacktrace of the oops is pretty much random
and not related to HFS. But I was able to get useful info from it when
I recompiled with CONFIG_SLUB_DEBUG_ON=y. In this case I don't get
oops but the following instead:

[   81.508807] hfs: filesystem size too large.
[   81.559295] =============================================================================
[   81.656965] BUG kmalloc-4096: Invalid object pointer 0xffff880136160400
[   81.735947] -----------------------------------------------------------------------------
[   81.735948]
[   81.851359] INFO: Slab 0xffffea0004d85800 objects=7 used=7 fp=0x
      (null) flags=0x2000000000004081
[   81.965628] Pid: 2086, comm: ipod-set-info Not tainted 3.1.0-rc4+ #2
[   81.965629] Call Trace:
[   81.965636]  [<ffffffff8119359f>] slab_err+0xaf/0xd0
[   81.965640]  [<ffffffff8119381f>] ? slab_pad_check+0xaf/0x1a0
[   81.965644]  [<ffffffff8119719f>] free_debug_processing+0x1ef/0x310
[   81.965647]  [<ffffffff811974ba>] __slab_free+0x1fa/0x490
[   81.965653]  [<ffffffffa0516c4d>] ? hfsplus_fill_super+0x2ed/0x610 [hfsplus]
[   81.965656]  [<ffffffff81197a3c>] kfree+0x12c/0x150
[   81.965660]  [<ffffffffa0516c4d>] hfsplus_fill_super+0x2ed/0x610 [hfsplus]
[   81.965665]  [<ffffffff81438771>] ? ioctl_internal_command.clone.4+0x61/0x1b0
[   81.965671]  [<ffffffff8161fe9e>] ? _raw_spin_unlock+0xe/0x40
[   81.965675]  [<ffffffff81195eb8>] ? deactivate_slab+0x578/0x750
[   81.965679]  [<ffffffff811af3cb>] ? sget+0xab/0x480
[   81.965683]  [<ffffffff8133f0c9>] ? put_dec+0x59/0x60
[   81.965685]  [<ffffffff813407d1>] ? number.clone.2+0x311/0x350
[   81.965690]  [<ffffffff8116bd7b>] ? pcpu_alloc_area+0x10b/0x2c0
[   81.965693]  [<ffffffff81341b81>] ? vsnprintf+0x471/0x610
[   81.965696]  [<ffffffff8116c639>] ? pcpu_alloc+0x399/0x9e0
[   81.965699]  [<ffffffff81341dc4>] ? snprintf+0x34/0x40
[   81.965702]  [<ffffffff8133ebc6>] ? strlcpy+0x46/0x60
[   81.965707]  [<ffffffff8115bfb2>] ? register_shrinker+0x52/0x60
[   81.965710]  [<ffffffff811afa26>] mount_bdev+0x1c6/0x210
[   81.965714]  [<ffffffffa0516960>] ? hfsplus_iget+0x240/0x240 [hfsplus]
[   81.965718]  [<ffffffffa05160a5>] hfsplus_mount+0x15/0x20 [hfsplus]
[   81.965720]  [<ffffffff811b0547>] mount_fs+0x47/0x1c0
[   81.965723]  [<ffffffff8116cc90>] ? __alloc_percpu+0x10/0x20
[   81.965727]  [<ffffffff811ca383>] vfs_kern_mount+0x63/0xd0
[   81.965731]  [<ffffffff811cb4d4>] do_kern_mount+0x54/0x110
[   81.965734]  [<ffffffff811cd022>] do_mount+0x502/0x7e0
[   81.965736]  [<ffffffff8116738b>] ? strndup_user+0x5b/0x80
[   81.965739]  [<ffffffff811cd710>] sys_mount+0x90/0xe0
[   81.965744]  [<ffffffff81627402>] system_call_fastpath+0x16/0x1b
[   81.965746] FIX kmalloc-4096: Object at 0xffff880136160400 not freed

Following by 2 other bugs with the same stack trace.

(BTW, before oops first message "hfs: filesystem size too large"
always appears twice.)


Another question: is hfsplus supposed to work at all? I see it's
marked as "Orphaned" in MAINTAINERS and on attempt to connect iPod
with kernel 2.6.38.11 (standard kernel in Ubuntu 11.04) I still don't
get it working. Although without oops I get the following messages:

[   65.479360] usb 2-3: new high speed USB device using ehci_hcd and address 4
[   65.686470] usbcore: registered new interface driver uas
[   65.706455] Initializing USB Mass Storage driver...
[   65.706901] scsi4 : usb-storage 2-3:1.0
[   65.707251] usbcore: registered new interface driver usb-storage
[   65.707254] USB Mass Storage support registered.
[   66.702320] scsi 4:0:0:0: Direct-Access     Apple    iPod
  1.62 PQ: 0 ANSI: 0
[   66.704537] sd 4:0:0:0: Attached scsi generic sg2 type 0
[   66.809047] sd 4:0:0:0: [sdb] 1946049 4096-byte logical blocks:
(7.97 GB/7.42 GiB)
[   66.809930] sd 4:0:0:0: [sdb] Write Protect is off
[   66.809935] sd 4:0:0:0: [sdb] Mode Sense: 68 00 00 08
[   66.809938] sd 4:0:0:0: [sdb] Assuming drive cache: write through
[   66.885037] sd 4:0:0:0: [sdb] 1946049 4096-byte logical blocks:
(7.97 GB/7.42 GiB)
[   66.885933] sd 4:0:0:0: [sdb] Assuming drive cache: write through
[   66.979400]  sdb: [mac] sdb1 sdb2
[   66.981940] sd 4:0:0:0: [sdb] 1946049 4096-byte logical blocks:
(7.97 GB/7.42 GiB)
[   66.982834] sd 4:0:0:0: [sdb] Assuming drive cache: write through
[   67.055808] sd 4:0:0:0: [sdb] Attached SCSI removable disk
[   67.299357] sd 4:0:0:0: [sdb] Bad block number requested
[   67.362982] hfs: unable to find HFS+ superblock
[   67.499457] sd 4:0:0:0: [sdb] Bad block number requested
[   67.563085] hfs: unable to find HFS+ superblock


Thank you,
Pavel