questions on nonsleepable lock

Andrey V. Elsukov bu7cher at
Wed Aug 15 21:47:56 PDT 2007

Ronnel P. Maglasang wrote:
> this is getting to be a serious problem in freebsd. i'm also encountering
> the same panic problem. my box runs on freebsd 6.1 with ipfw, pf,
> forwarding/routing enabled and several network-based applications. the 
> panic
> occurs when the system is subjected to a very high traffic load and some
> applications are busy doing disk IO, system and socket calls.

First of, try to enable dump kernel memory after panic. See the
chapter 11 of FreeBSD Developers' Handbook:

> i think this was already asked in this thread. i just want to clarify if
> this problem is caused by user-applications (non-kernel). or possibly
> a system/ioctl call from user-application. i don't see mtx_*, giant or 

This problem can be caused by a system call, as well by the
high network or IO load.

WBR, Andrey V. Elsukov

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