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Check that in_pcbfree() is only called once for each PCB.
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Authored by jtl on Apr 6 2018, 4:31 PM.
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Details

Summary

Check that in_pcbfree() is only called once for each PCB. If that assumption is violated, "bad things" could follow.

I believe such an assert would have detected some of the problems @jch was chasing in PR 203175 (see r307551). We also use it in our internal TCP development.

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rS FreeBSD src repository - subversion
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