On Fri, Mar 27, 2009 at 6:00 PM, Szabolcs Szakacsits <[email protected]> wrote:
>
> Hi,
>
> Thank you for the update.
>
> On Fri, 27 Mar 2009, Pascal Terjan wrote:
>
>> I finally have some interesting information!
>>
>> This issue happens when audit is enabled:
>>
>> auditctl -e 1
>> auditctl -w /etc
>> mount /dev/sda1 /mnt/windows
>
> I suppose then the problem is in the kernel audit code? This is how
> ntfs-3g mount happens considering the /etc directory:
>
> /bin/mount calls /bin/ntfs-3g
> /bin/ntfs-3g calls /bin/mount to update /etc/mtab
> the second /bin/mount hangs
>
> Hopefully this will help the developer who is writing the kernel
> audit code.
>
> Regards,
> Szaka
>
The second /bin/mount hangs on readlink("/mnt/windows",
mount S 00004cca 0 11821 11819
c3401dcc 00200082 00004cca 00004cca c3401d7c c0134709 00200086 386e9131
000003e1 00004cca dfb8d540 dfb5a000 c05ebcd9 c05b7380 df88a490 df88a6f0
c1409380 00000000 00000000 38734404 000003e1 c3401db0 c3401da8 df88a6f0
Call Trace:
[<c0134709>] ? release_console_sem+0x199/0x1e0
[<c014934a>] ? prepare_to_wait+0x3a/0x70
[<e0d4a77c>] wait_answer_interruptible+0x6c/0xa0 [fuse]
[<c01490f0>] ? autoremove_wake_function+0x0/0x50
[<e0d4a9f1>] fuse_request_send+0x181/0x250 [fuse]
[<e0d4bba5>] ? fuse_get_req+0xc5/0x120 [fuse]
[<e0d4c403>] fuse_getxattr+0xe3/0x140 [fuse]
[<e0d4c320>] ? fuse_getxattr+0x0/0x140 [fuse]
[<c022d940>] get_vfs_caps_from_disk+0x60/0xe0
[<c01ba5eb>] ? __link_path_walk+0x26b/0xd70
[<c016cfa7>] audit_copy_inode+0x77/0xb0
[<c016d410>] __audit_inode+0xf0/0x280
[<c01bb4da>] do_path_lookup+0x13a/0x1a0
[<c01bc0aa>] user_path_at+0x4a/0x80
[<c01c770d>] ? mntput_no_expire+0x1d/0x140
[<c01c770d>] ? mntput_no_expire+0x1d/0x140
[<c01b45fe>] sys_readlinkat+0x2e/0x90
[<c01b4687>] sys_readlink+0x27/0x30
[<c0103fdb>] sysenter_do_call+0x12/0x2f
[<c03a0000>] ? serial_pnp_probe+0xb0/0x240
So it looks like the issue is that when mount does readlink on the
mountpoint audit will do a request to get the xattr which will hang
because ntfs-3g is not ready to reply, probably waiting for mount to
finish
Is it necessary to wait for the child mount in main process ?
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