-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Jeff Moyer wrote:
==> Regarding Re: [Wlug] HOWTO debug hard lockups; "Chuck R. Anderson" <cra@WPI.EDU> adds:
cra> On Sun, Jun 05, 2005 at 10:35:13PM -0400, Andy Stewart wrote:
I've tried setting "nmi_watchdog=1" to see if I could get an "oops" when it hard locks - no dice. Do you know any other tricks I could try to see if it is the kernel which is locking up? I'm running SuSE's version of 2.6.8.
cra> Have you enabled the kernel Magic SysRq key and tried typing that when cra> it locks up?
cra> sysctl -w kernel.sysrq = 1
cra> When it locks up:
cra> Alt-SysRq-? for help, then try dumping the PC, Tasks, etc. You may cra> even be able to do an Emergency RO Mount and Sync before doing a Boot.
This requires that you are not in X windows at the time of the lockup. See my other email in this thead.
HI all, The damn thing locked up on me *again* this evening, while trying to reply to this thread. On every occasion, I have been in X windows at the time of the lockup. I am either actively working or the screen saver is running, and the system locks up sometime in the middle of the night. What I can do is leave X windows running, but switch to a console before going to bed. If it hangs in the night, will I then be able to use the Alt-SysReq key sequences to get debug info? Thanks! Andy - -- Andy Stewart, Founder Worcester Linux Users' Group Worcester, MA, USA http://www.wlug.org -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.5 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQFCpinZHl0iXDssISsRAvwdAJ96My0XChSA5+kGI8XxzULjy27RMQCfVvey aSEYIUzjrxzfhr38eAs6q7Q= =+3IF -----END PGP SIGNATURE-----