BISECTED REGRESSION: 2.6.26-rc2: FUSE changes break mount of ntfs-3g

[Ioan Ionita]

Hi,

Running a Linux ops-desktop 2.6.26-rc1 #7 SMP PREEMPT Sat May 17
19:33:36 EEST 2008 x86_64 GNU/Linux

When attempting to mount a ntfs-3g partition under 2.6.26-rc2, i got
the following error:

fuse: mount failed: Cannot allocate memory

I also got the OOPS included below. I bisected the error to:

b6f2fcbcfca9db2bd7aa24940224fcd3bbdbb8aa is first bad commit
commit b6f2fcbcfca9db2bd7aa24940224fcd3bbdbb8aa
Author: Miklos Szeredi <mszeredi@xxxxxxx>
Date:   Wed Apr 30 00:54:34 2008 -0700

    mm: bdi: expose the BDI object in sysfs for FUSE

    Register FUSE's backing_dev_info under sysfs with the name
"fuse-MAJOR:MINOR"

    Make the fuse control filesystem use s_dev instead of a fuse specific ID.
    This makes it easier to match directories under
/sys/fs/fuse/connections/ with
    directories under /sys/class/bdi, and with actual mounts.

    Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxx>
    Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
    Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
    Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>

:040000 040000 f993fbf0716b58bfcf12dd27abbb25c43ab78326
176a10dec86edc841fc44db6ad4011377a9efe02 M	fs


OOPS:

WARNING: at fs/sysfs/dir.c:425 sysfs_add_one+0xa3/0xc0()
Modules linked in:
Pid: 7545, comm: mount.ntfs Not tainted 2.6.26-rc1 #7

Call Trace:
 [<ffffffff80250ce4>] warn_on_slowpath+0x64/0xa0
 [<ffffffff80251e1e>] printk+0x4e/0x60
 [<ffffffff802c2e93>] find_inode+0x43/0x70
 [<ffffffff802f9cf0>] sysfs_ilookup_test+0x0/0x10
 [<ffffffff802c3014>] ifind+0x64/0xc0
 [<ffffffff802f9f99>] sysfs_find_dirent+0x29/0x40
 [<ffffffff802fa053>] sysfs_add_one+0xa3/0xc0
 [<ffffffff802fa670>] create_dir+0x60/0xb0
 [<ffffffff802fa6f1>] sysfs_create_dir+0x31/0x50
 [<ffffffff8037b4d2>] kobject_get+0x12/0x20
 [<ffffffff8037b632>] kobject_add_internal+0xe2/0x1c0
 [<ffffffff8037bc14>] kobject_add+0x54/0x80
 [<ffffffff80314efa>] search_by_key+0x14a/0xe10
 [<ffffffff802869be>] free_pages_bulk+0xde/0x300
 [<ffffffff8037b4d2>] kobject_get+0x12/0x20
 [<ffffffff803ed807>] get_device+0x17/0x30
 [<ffffffff803edf6a>] device_add+0xba/0x5c0
 [<ffffffff8037b273>] kobject_init+0x33/0x90
 [<ffffffff803ee578>] device_create+0xe8/0x140
 [<ffffffff8038080c>] vsnprintf+0x45c/0x700
 [<ffffffff80382da1>] kvasprintf+0x71/0x90
 [<ffffffff8028f375>] bdi_register+0x95/0x120
 [<ffffffff802ab854>] percpu_populate+0x44/0x60
 [<ffffffff802aa054>] __kmalloc+0xa4/0x100
 [<ffffffff802ab9e7>] __percpu_alloc_mask+0x77/0xb0
 [<ffffffff8038d86c>] percpu_counter_init+0x6c/0x80
 [<ffffffff8028f227>] bdi_init+0x77/0xc0
 [<ffffffff8035300a>] fuse_fill_super+0x23a/0x640
 [<ffffffff805a14c1>] __down_write_nested+0xa1/0xc0
 [<ffffffff8037f35e>] strlcpy+0x4e/0x80
 [<ffffffff802b0664>] get_sb_bdev+0x144/0x180
 [<ffffffff80352dd0>] fuse_fill_super+0x0/0x640
 [<ffffffff802b0396>] vfs_kern_mount+0x56/0xc0
 [<ffffffff802b0463>] do_kern_mount+0x53/0x110
 [<ffffffff802c892b>] do_new_mount+0x9b/0xe0
 [<ffffffff802c8b56>] do_mount+0x1e6/0x220
 [<ffffffff8026a1a6>] down+0x16/0x50
 [<ffffffff802c8c2b>] sys_mount+0x9b/0x100
 [<ffffffff8022442b>] system_call_after_swapgs+0x7b/0x80

---[ end trace 1f3b5efdffae7d27 ]---
kobject_add_internal failed for 253:3 with -EEXIST, don't try to
register things with the same name in the same directory.
Pid: 7545, comm: mount.ntfs Tainted: G        W 2.6.26-rc1 #7

Call Trace:
 [<ffffffff8037b6c3>] kobject_add_internal+0x173/0x1c0
 [<ffffffff8037bc14>] kobject_add+0x54/0x80
 [<ffffffff80314efa>] search_by_key+0x14a/0xe10
 [<ffffffff802869be>] free_pages_bulk+0xde/0x300
 [<ffffffff8037b4d2>] kobject_get+0x12/0x20
 [<ffffffff803ed807>] get_device+0x17/0x30
 [<ffffffff803edf6a>] device_add+0xba/0x5c0
 [<ffffffff8037b273>] kobject_init+0x33/0x90
 [<ffffffff803ee578>] device_create+0xe8/0x140
 [<ffffffff8038080c>] vsnprintf+0x45c/0x700
 [<ffffffff80382da1>] kvasprintf+0x71/0x90
 [<ffffffff8028f375>] bdi_register+0x95/0x120
 [<ffffffff802ab854>] percpu_populate+0x44/0x60
 [<ffffffff802aa054>] __kmalloc+0xa4/0x100
 [<ffffffff802ab9e7>] __percpu_alloc_mask+0x77/0xb0
 [<ffffffff8038d86c>] percpu_counter_init+0x6c/0x80
 [<ffffffff8028f227>] bdi_init+0x77/0xc0
 [<ffffffff8035300a>] fuse_fill_super+0x23a/0x640
 [<ffffffff805a14c1>] __down_write_nested+0xa1/0xc0
 [<ffffffff8037f35e>] strlcpy+0x4e/0x80
 [<ffffffff802b0664>] get_sb_bdev+0x144/0x180
 [<ffffffff80352dd0>] fuse_fill_super+0x0/0x640
 [<ffffffff802b0396>] vfs_kern_mount+0x56/0xc0
 [<ffffffff802b0463>] do_kern_mount+0x53/0x110
 [<ffffffff802c892b>] do_new_mount+0x9b/0xe0
 [<ffffffff802c8b56>] do_mount+0x1e6/0x220
 [<ffffffff8026a1a6>] down+0x16/0x50
 [<ffffffff802c8c2b>] sys_mount+0x9b/0x100
 [<ffffffff8022442b>] system_call_after_swapgs+0x7b/0x80


If any further info is required, let me know. I'm willing to test any
patches as well.

Kudos!
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