Nikolaus Rath <[email protected]> writes: > [email protected] writes: >> 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. > > Excellent suggestion, thanks. When I looked into nbd, I found > https://bugs.launchpad.net/ltsp/+bug/589034. > > I will try to disable nbd-proxy and report if that helps.
After disabling nbd-proxy and adding --persist to the nbd-client options, I was able to eliminate the problem. Thanks for your help. I will try to get this problem addressed by the nbd developers. Best, -Nikolaus -- »Time flies like an arrow, fruit flies like a Banana.« PGP fingerprint: 5B93 61F8 4EA2 E279 ABF6 02CF A9AD B7F8 AE4E 425C ------------------------------------------------------------------------------ This SF.net email is sponsored by Sprint What will you do first with EVO, the first 4G phone? Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first
