a0d571cbef
icmp_reflect(), called through icmp_error() requires us to be in NET_EPOCH. Failure to hold it leads to the following panic (with INVARIANTS): panic: Assertion in_epoch(net_epoch_preempt) failed at /usr/src/sys/netinet/ip_icmp.c:742 cpuid = 2 time = 1571233273 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe00e0977920 vpanic() at vpanic+0x17e/frame 0xfffffe00e0977980 panic() at panic+0x43/frame 0xfffffe00e09779e0 icmp_reflect() at icmp_reflect+0x625/frame 0xfffffe00e0977aa0 icmp_error() at icmp_error+0x720/frame 0xfffffe00e0977b10 pf_intr() at pf_intr+0xd5/frame 0xfffffe00e0977b50 ithread_loop() at ithread_loop+0x1c6/frame 0xfffffe00e0977bb0 fork_exit() at fork_exit+0x80/frame 0xfffffe00e0977bf0 fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe00e0977bf0 Note that we now enter NET_EPOCH twice if we enter ip_output() from pf_intr(), but ip_output() will soon be converted to a function that requires epoch, so entering NET_EPOCH directly from pf_intr() makes more sense. Discussed with: glebius@
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