Maybe this is really a kernel bug? I am not sure whether to open a new report for this.
Anyway, here are some more observations: - The system can still be accessed via ssh, so it isn't really locked up, only screen and input devices do not work. - it seems that whenever the described bug occurs, there is some stack trace written to /var/log/kern.log: Nov 2 14:02:55 slaine kernel: [ 3052.385064] BUG: scheduling with irqs disabled: mysqld/0x00000001/4794 Nov 2 14:02:55 slaine kernel: [ 3052.385083] caller is rt_spin_lock_slowlock+0x92/0x250 Nov 2 14:02:55 slaine kernel: [ 3052.385091] Pid: 4794, comm: mysqld Tainted: P 2.6.27-3-rt #1 Nov 2 14:02:55 slaine kernel: [ 3052.385097] [<c03512f6>] ? printk+0x18/0x1a Nov 2 14:02:55 slaine kernel: [ 3052.385105] [<c0351cb0>] schedule+0xf0/0x100 Nov 2 14:02:55 slaine kernel: [ 3052.385112] [<c0353682>] rt_spin_lock_slowlock+0x92/0x250 Nov 2 14:02:55 slaine kernel: [ 3052.385120] [<c0353e1a>] __rt_spin_lock+0x4a/0x50 (... A full trace is attached as file trace.log.gz ...) It is not always mysqld, for instance I also saw a similar trace for kaffeine, which also was created exactly at the moment the system (the x session, whatever) locked up. There are other traces written to the log, but they do not seem to be related, at least there where no *observable* problems. I am running an up-to-date ubuntu 8.10 installation. uname -av says Linux slaine 2.6.27-3-rt #1 PREEMPT RT Mon Oct 27 03:05:19 UTC 2008 i686 GNU/Linux The processor is actually a x86_64, but my I am running it in 32bit mode. Version of the NVidia driver is 173.14.12 The graphics adapter is a GeForce FX 5700LE I will try to switch to the generic kernel image and see if the problem is still there. Maybe it is just related to the PREEMPT/RT-stuff. ** Attachment added: "trace.log.gz" http://launchpadlibrarian.net/19231401/trace.log.gz -- Switch User freezes at blank screen https://bugs.launchpad.net/bugs/112518 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
