Subject: Re: crash? Date: Thu, Apr 19, 2001 at 10:21:34AM -0500
In reply to:[EMAIL PROTECTED] Quoting [EMAIL PROTECTED]([EMAIL PROTECTED]): > > What are these "magic sysrq" key combinations and where could I read > up on them? I thought I knew atleast some of them, but without > knowing the kind of combinations you're talking about I can't be sure. > They could help out on the few times I have issues I can't recover > from and actually have to reboot. > 1. grep -i magic /usr/src/linux/.config CONFIG_MAGIC_SYSRQ=y 2. less /usr/src/linux/Doc*/Configure.help 2a. search for it /CONFIG_MAGIC_SYSRQ CONFIG_MAGIC_SYSRQ If you say Y here, you will have some control over the system even if the system crashes for example during kernel debugging (e.g., you will be able to flush the buffer cache to disk, reboot the system immediately or dump some status information). This is accomplished by pressing various keys while holding SysRq (Alt+PrintScreen). It also works on a serial console (on PC hardware at least), if you send a BREAK and then within 5 seconds a command keypress. The keys are documented in Documentation/sysrq.txt. Don't say Y unless you really know what this hack does. 3. read about it less /usr/src/linux/Documentation/sysrq.txt Rather then RTFM, I thought a fishing lesson might be more productive today. -- Real programmers disdain structured programming. Structured programming is for compulsive neurotics who were prematurely toilet-trained. They wear neckties and carefully line up pencils on otherwise clear desks. _______________________________________________________