Messages in this thread | | | Date | Wed, 12 Nov 2003 08:27:16 -0800 (PST) | From | Linus Torvalds <> | Subject | Re: 2.4.23-pre9 ide+XFree+ptrace=Complete hang |
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On Wed, 12 Nov 2003, Maciej Zenczykowski wrote: > > Well I got a hold of the necessary cabling and I'm sorry to report that > there is absolutely nothing on the serial console - I get the boot > messages, etc. fine, the last message before crashing is 'Loglevel set to > 9' [invoked by hand via Alt+SysRq+9], after which I crash it with 'strace > ls -lR /' (as a normal user) and nothing else shows up, no oops no nada.
Ok. The nice thing about getting a serial console is that now you could try the NMI watchdog - just boot up with "nmi_watchdog=1" on the kernel command line (or "=2" - see Documentation/nmi_watchdog.txt for more information on it).
That won't necessarily see the problem either, especially if it's a total hardware lockup brought on by X poking registers in unfortunate ways, but if it's a pure kernel lockup with interrupts disabled, it can help.
Linus
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