On  2 Oct, Don Lewis wrote:
> On  2 Oct, Stefan Farfeleder wrote:
> 
>> /freebsd/current/src/sys/vm/uma_core.c:1307: could sleep with "filedesc structure" 
>locked from /freebsd/current/src/sys/kern/kern_event.c:959
>> 
>> at me and freezes badly at some point (no breaking into ddb possible).
>> This is totally repeatable.  Is anybody able to reproduce (and maybe
>> fix) this?
> 
> It looks like the problem is that knote_attach() calls hashinit() while
> holding the lock, and that hashinit() calls MALLOC(..., M_WAITOK).
> 
> Try the following patch:
> 
[snip]

I went ahead and committed the patch.  It survived a
"make -j10 buildworld" test with your patched version of make.


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