Date: Tue, 10 Aug 1999 21:32:38 -0700 (PDT) From: Matthew Dillon <dillon@apollo.backplane.com> To: "Daniel O'Connor" <doconnor@gsoft.com.au> Cc: freebsd-hackers@FreeBSD.ORG, bvandepe@gsoft.com.au Subject: Re: Kernel malloc problem? Message-ID: <199908110432.VAA72189@apollo.backplane.com> References: <XFMail.990811133838.doconnor@gsoft.com.au>
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:size - to be malloc'ed. The tail queue holding the newly-
:allocated buffers is a local copy, and not subject to change
:in the event of an interrupt meant for the driver. Given
If the interrupt scans or in any way accesses the buffer list,
you have to disable interrupts temporarily using the appropriate
spl*() calls whenever your non-interrupt code (i.e. the ioctl code)
makes modifications to the list. Otherwise the interrupt might
occur while the list and/or buffers are in an invalid state.
If that isn't the problem, look for situations where you might
be corrupting memory within the driver. The two most common
situations are where you accidently leave references to a buffer
you just freed, or where you overrun a buffer.
:---
:Daniel O'Connor software and network engineer
-Matt
Matthew Dillon
<dillon@backplane.com>
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