linux-ext4 - [Bug 53951] New: race condition on mounting local disks with autofs

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Date:	Sat, 16 Feb 2013 15:55:41 +0000 (UTC)
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 53951] New: race condition on mounting local disks with autofs

https://bugzilla.kernel.org/show_bug.cgi?id=53951

           Summary: race condition on mounting local disks with autofs
           Product: File System
           Version: 2.5
    Kernel Version: 3.7.7
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: ext4
        AssignedTo: fs_ext4@...nel-bugs.osdl.org
        ReportedBy: harri@...ics.de
        Regression: No


I am using autofs to mount a local disk to /misc/data6 on request. Problem: It
seems that the first access silently fails, if the disk is not yet mounted.


Below is an example. Before running it I had umounted /misc/data6 and restarted
autofs.

% find /misc/data6 | wc -l; find /misc/data6 | wc -l
18
find: `/misc/data6/lost+found': Permission denied
358


As you can see, the first "find" sees just a subset of the directory entries.
The second "find" stumbles over lost+found (as expected) and finds all entries.

Kernel is 3.7.7. There is no error message in kernel.log, only a line to
mention the mount:

EXT4-fs (sdd1): mounted filesystem with ordered data mode. Opts: (null)


/etc/auto.master:
/misc   /etc/auto.misc

/etc/auto.misc:
data1   -fstype=auto,noatime    :/dev/disk/by-label/data1
data2   -fstype=auto,noatime    :/dev/disk/by-label/data2
data3   -fstype=auto,noatime    :/dev/disk/by-label/data3
data4   -fstype=auto,noatime    :/dev/disk/by-label/data4
data5   -fstype=auto,noatime    :/dev/disk/by-label/data5
data6   -fstype=auto,noatime    :/dev/disk/by-label/data6
data7   -fstype=auto,noatime    :/dev/disk/by-label/data7
data8   -fstype=auto,noatime    :/dev/disk/by-label/data8


The problem is reproducible, as it seems. Please mail if I can help to track
this down.

Regards
Harri

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