Messages in this thread |  | | From | Herbert Rosmanith <> | Subject | system hangs, out of memory ? | Date | Fri, 31 May 1996 15:11:14 +0200 (MET DST) |
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hi,
I don't know if this behaviour has been changed, but sometimes, when you run out of swap, you will not get a error messages like "not enough virtual memory", but the system will silently hang. has this problem been touched with the recent 1.99.? kernels ?
I'm using perl-mirror to mirror a site (> 1G) at night, and perl-mirror is definitely a memory hog. Yet I don't know what's causing the hang, but perl-mirror looks very suspicious to me.
The system is not completely dead. TCP is dead, but ICMP still lives, i.e. you can ping the system and will get echo-replies, but you cannot telnet to the system. It will either not respond at all, or your client will simply write "Connected to [...]" and then you'll wait infinitely for a login-prompt.
I have not tried the software watchdog yet (will soon), but, since, as the last case shows, the system is not completely dead, it is possible that the software-watchdog will still be running too and the machine will not reboot.
So, since the machine still reacts to ICMP echo request/reply, what do you think about the hack to create a new ICMP subtype: "icmp reboot". if the network layer detects such a packet (from a particular IP and/or ether- address), it will simply call "hard_reset_now" ... comments ?
regards, herbert rosmanith herp@wildsau.idv.uni-linz.ac.at rosmanith@edvz.uni-linz.ac.at
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