I too have this problem with 8.04 on a Thinkpad T60(8744-5BU). It started about two to four months ago. I wish I remembered exactly when. I did not do any kind of bug report then as I had to take the time to eliminate the possibility that it was due to the bleeding-edge drivers I generally use(madwifi and radeonhd).
The symptoms of the lockup are: * NO blinking caps light * a total system freeze, * unresponsive to sysrq * If the hard disk was active at the time the disk light remains lit * nothing in the logs I tried using the distribution's radeon and fglrx x.org drivers, I completely disabled the madwifi drivers, and I tried running older Hardy beta kernels I had installed such as 2.6.24-12-generic but still experienced lockups. Then I noticed that the lockups seem to occur while the laptop is being backed up. I use BackupPC(rsync as the transfer protocol) to backup the laptop both at home and at work. The lockups happen 80% of the time during a backup at home and not at all at work. I disabled backups at home and it seemed to help. There were a few lockups that did happen so this may indicate it is a certain pattern of network activity rather than an application that causes it. Then I did some Bittorrent downloads using gnome-btdownload and had lockups quite consitently with that too.(I don't use Bittorrent at work so I can't really test to see if there is a network-specific issue here.) I then did some Bittorrent downloads using btdownload-curses from the console and not switching away from the console. No lockups. BUT, I found that after doing this(with a full or partial BT download) and switching back to the Gnome desktop the system would lock after a few minutes. Also interesting is that I recently did a long Bittorrent (gnome-btdownload) download from a slow seeder(1-5 KB/s. I know that is REAL slow, but it hardly matters when I leave the laptop on ovrenight) and did not have a lockup UNTIL the system experienced high network utilization.(MythTv I think) I have had only two lockups while running MythTv(viewing HD video) with its high network utilization.(one mentioned above) There have been a few lockups during regular web browsing and network utilization was low. Again, it does not always appear to be a matter of the amount of network utilization, but some other factor. I must also note that I am ALWAYS on the WIRED ethernet when these lockups happen. I wonder if there is an e1000 driver issue? Or an interaction between e1000 and some junk switches?(I've got a no-name 10/100 switch) I have not been able to obtain any metrics that would indicate a problem. I was monitoring the values in /proc/slabinfo and did see the number of active objects for "dentry" increase quite a bit during Bittorrent downloads and backups. But this is where everything is black magic to me. I can get you these numbers if you thinkg it will help. Running kernel 2.6.24-19-generic. Bug 214108 may be a candidate for the duplicate bugs list. -- Heavy network activity (eg: torrent/nfs file transfers) causes Hard System Locks and/or Network Freezes. https://bugs.launchpad.net/bugs/147464 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
