[Bug 293241] sys/netpfil/ipfw/log:bpf test fails intermittently in CI

In reply to: bugzilla-noreply_a_freebsd.org: "[Bug 293241] sys/netpfil/ipfw/log:bpf test fails intermittently in CI"
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From: <bugzilla-noreply_at_freebsd.org>
Date: Tue, 17 Feb 2026 22:50:08 UTC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293241

Gleb Smirnoff <glebius@FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|New                         |In Progress

--- Comment #1 from Gleb Smirnoff <glebius@FreeBSD.org> ---
I was able to reproduce that. Sometimes one of the 4 tcpdump processes doesn't
capture a packet and doesn't write it to file. I have added ktrace to see
what's going on. The result is really surprising to me:

  4795 tcpdump  0.026949729 CALL  cap_enter
  4795 tcpdump  0.026952795 RET   cap_enter 0
  4795 tcpdump  0.026955109 CALL  read(0x3,0x2ffc0362a980,0x80000)
  4795 tcpdump  0.054705876 RET   read RESTART
  4795 tcpdump  0.054708762 PSIG  SIGKILL SIG_DFL code=SI_NOINFO

Something immediately kills one of the tcpdumps. Digging further.

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