freeze vs freezer

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It seems that a process blocked in a write to an xfs filesystem due to
xfs_freeze cannot be frozen by the freezer.

I see this if I suspend my laptop while doing something xfs-filesystem
intensive, like a kernel build.  My suspend scripts freeze the XFS
filesystem (as Dave said I should), which presumably blocks some writer,
and then the freezer times out and fails to complete.

Here's part of the process dump the freezer does when it times out:

cc1           D 00000000     0 18138  18137
       dd5f1e24 00200082 00000002 00000000 ecdeeb00 ecdeec64 c200f280 00000001 
       009c09a0 dd5f1e0c dd5f1e0c 0000000f 00000000 00000000 00000000 dd5f1e74 
       c7beb480 dd5f1e88 dd5f1ea8 c0228d97 e8889540 dd5f1e38 c015b75d dd5f1e44 
Call Trace:
 [<c0228d97>] xfs_write+0xf4/0x6d9
 [<c0226038>] xfs_file_aio_write+0x53/0x5b
 [<c0171c15>] do_sync_write+0xae/0xec
 [<c0172343>] vfs_write+0xa4/0x120
 [<c01728d7>] sys_write+0x3b/0x60
 [<c0106fae>] sysenter_past_esp+0x6b/0xa1
 =======================


I haven't looked at how to fix this yet.  I only just worked out why I
was getting suspend failures.

    J
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