Hello Nikolaus,
Nikolaus Rath:
> I have set up diskless fat clients with kernel 2.6.32. The root filesystem is
> aufs. Underlying the aufs is an rw tmpfs and a ro squashfs, the later mounted
> from NBD.
>
> The problems is that the fat clients work fine for a little while, but then
> reproducibly freeze completely within a few hours after booting. The last
> syslog messages that the server receives are:
:::
> Jul 10 14:11:38 beta kernel: [25560.688168] Call Trace:
> Jul 10 14:11:38 beta kernel: [25560.688185] [<c058a5ca>] io_schedule+0x3a/0x60
> Jul 10 14:11:38 beta kernel: [25560.688194] [<c022d1f8>] sync_buffer+0x38/0x40
> Jul 10 14:11:38 beta kernel: [25560.688201] [<c058ad6d>]
> __wait_on_bit+0x4d/0x70
> Jul 10 14:11:38 beta kernel: [25560.688207] [<c022d1c0>] ?
> sync_buffer+0x0/0x40
> Jul 10 14:11:38 beta kernel: [25560.688214] [<c022d1c0>] ?
> sync_buffer+0x0/0x40
> Jul 10 14:11:38 beta kernel: [25560.688220] [<c058ae3b>]
> out_of_line_wait_on_bit+0xab/0xc0
> Jul 10 14:11:38 beta kernel: [25560.688230] [<c0167850>] ?
> wake_bit_function+0x0/0x50
> Jul 10 14:11:38 beta kernel: [25560.688237] [<c022d1be>]
> __wait_on_buffer+0x2e/0x30
> Jul 10 14:11:38 beta kernel: [25560.688266] [<f80ec30b>]
> squashfs_read_data+0x30b/0x720 [squashfs]
:::
The call trace shows the process stops in the block device layer,
squashfs --> NBD. I'd suggest you to test NBD by using it for several
hours.
Also it may be worth to try other kernel versions, 2.6.31 or 2.6.33
since the problem may exist in 2.6.32.
J. R. Okajima
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