Panic in tcp_input

Ian FREISLICH ianf at
Wed Jun 19 18:19:32 UTC 2013

Gleb Smirnoff wrote:
> A> This seems to be a fallout of the recent UMA changes and its interaction
> A> with the per-cpu counter(9) system.
> A> 
> A> Adding in and handing over to Gleb and Jeff as they touched this area last
> Ian has reported this panic several days before Jeff's changes :(

Do you want me to try to find the revision of origin?  I have a
verified sighting at r251615 and I'm pretty sure I've seen it earlier
than that.  Subjectively, it seems to have got a lot worse lately.
Maybe the "recent UMA changes" have exposed some latent issue?


Ian Freislich

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