Where to ask about a 7.2 bug, and debugging sys/queue.h errors

[Kostik Belousov]

On Thu, Aug 25, 2011 at 03:16:09PM -0600, Charlie Martin wrote:
> We're having a crash in some internal code running on FreeBSD 7.2 
> (specifically  7.2-PRERELEASE FreeBSD 7.2-PRERELEASE and yeah, I know 
> it's quite a bit behind) in which after 18-30 hours of running load 
> tests, the code panics with:
> 
> panic: Bad link elm 0xffffff0044c09600 next->prev != elm
> cpuid = 0
> KDB: stack backtrace:
> db_trace_self_wrapper() at 0xffffffff8019119a = db_trace_self_wrapper+0x2a
> panic() at 0xffffffff80307c72 = panic+0x182
> devfs_populate_loop() at 0xffffffff802a43a8 = devfs_populate_loop+0x548
> 
> 
> First question: where's the most appropriate place to ask about this 
> kind of bug on a back version.
It is fine to ask there.

> 
> Second: does this remind anyone of any bugs?  Googling came up with a 
> few somewhat similar things but hasn't provided much insight so far.
In 99% of the cases, it means that you forgot to dev_ref() some cdev.
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