Hello all,
I've found what probably is going wrong in tcp_hostcache. The problem is me cutting corners (what goes around comes around...) in tcp_hc_insert when the bucket limit is reached. I made the #if 0 too big and the bucket was not removed from the tailqueue when we hit the bucket limit. A couple of lines later it is inserted again as head element which leads to an infinite loop either when the next lookup on the same bucket row is done, or when the the tcp_hc_purge function is run to timeout the entries.
Please try the attached patch which should fix it.
This appears to have succesfully cured my lockup. I now have the original kernel config booted again with full inet6 etc and it's not locked up.
Regards, Matt.
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