Please read "man crash" and the part of the handbook which talks about how to obtain a crashdump or backtrace with more information about the panic you see.

You might consider putting both a backtrace and a dmesg from the system on the web somewhere, and post links to that.

Alex wrote:
For some reason my 5.4 STABLE is dying each 4-5 hours with panic above.
This is big Web server with Apache configured to 1500 MaxClients. All kernel
tunings suggested for high load servers by freebsd handbook are in place.
Hardware is Intel server board, P4-3.0 cpu with HT off, 3Gb ram, 1eide, 2sata.

By the way, you don't have enough RAM to handle 1500 concurrent Apache processes, even with a minimal config (ie, no SSL, no mod_perl, no PHP).

The busiest site I've ever administered needed between 100 and 150 apache children in order to serve a load of ~2 million hits per day.

--
-Chuck
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