Re: Hang during rm on ext2 mounted sync (2.6.14-rc2+)

[Andrew Morton <akpm@osdl.org>]

Chris Sykes <chris@sigsegv.plus.com> wrote:
>
> Kernels: 2.6.14-rc1 -> 2.6.14-rc2 + up to hg changeset 5c9ff0e17a61
> 
>  I'm experiencing processes getting stuck in the 'D' state whilst
>  rm'ing files on an ext2 fs mounted with the 'sync' option.  What I've
>  tested so far:
> 
>   * Ext2 mounted with sync:     rm hangs
>   * Ext2 mounted without sync:  OK
>   * Ext3 mounted with sync:     OK
>   * Ext3 mounted without sync:  OK
> 
>  I first noticed this on my /boot partition, and wanted to know whether
>  it was repeatable so I've created a few test ext2 filesystem images
>  and mounted them via loopback.

Odd.  Seems OK here.  How hard is it to make it occur?

I'd be suspecting a lost I/O completion from the device driver.  Are you
really sure that ext3 cannot be made to do the same thing?

Suggest you generate the `dmesg -s 1000000' output for both good and bad
kernels, do a `diff -u' on them and look for IDE complaints (or SCSI, if
you're on SCSI).

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