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Fri, 12 Jun 2020 13:03:55 -0700 (PDT) MIME-Version: 1.0 From: Ryan Stone Date: Fri, 12 Jun 2020 16:03:44 -0400 Message-ID: Subject: ndp -P => panic: prefix 0xfffff80011c56700 has referencing addresses To: freebsd-net Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: 49kBWJ57w1z40Fn X-Spamd-Bar: --- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20161025 header.b=kYp/Up4b; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (mx1.freebsd.org: domain of rysto32@gmail.com designates 2607:f8b0:4864:20::f30 as permitted sender) smtp.mailfrom=rysto32@gmail.com X-Spamd-Result: default: False [-3.66 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-0.96)[-0.960]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20161025]; FROM_HAS_DN(0.00)[]; FREEMAIL_FROM(0.00)[gmail.com]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-net@freebsd.org]; NEURAL_HAM_LONG(-0.98)[-0.985]; RCPT_COUNT_ONE(0.00)[1]; TO_DN_ALL(0.00)[]; DKIM_TRACE(0.00)[gmail.com:+]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; RCVD_IN_DNSWL_NONE(0.00)[2607:f8b0:4864:20::f30:from]; NEURAL_HAM_SHORT(-0.72)[-0.716]; R_SPF_ALLOW(-0.20)[+ip6:2607:f8b0:4000::/36]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US]; RCVD_COUNT_TWO(0.00)[2]; RCVD_TLS_ALL(0.00)[]; DWL_DNSWL_NONE(0.00)[gmail.com:dkim] X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 12 Jun 2020 20:03:58 -0000 # ifconfig vtnet0 inet6 1::1 # ndp -P panic: prefix 0xfffff80011c56700 has referencing addresses cpuid = 1 time = 1591991817 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe0022d08720 vpanic() at vpanic+0x19d/frame 0xfffffe0022d08770 panic() at panic+0x43/frame 0xfffffe0022d087d0 nd6_prefix_del() at nd6_prefix_del+0x1e7/frame 0xfffffe0022d08840 nd6_ioctl() at nd6_ioctl+0x5a8/frame 0xfffffe0022d088c0 ifioctl() at ifioctl+0x574/frame 0xfffffe0022d08990 kern_ioctl() at kern_ioctl+0x295/frame 0xfffffe0022d089f0 sys_ioctl() at sys_ioctl+0x15d/frame 0xfffffe0022d08ac0 amd64_syscall() at amd64_syscall+0x2b9/frame 0xfffffe0022d08bf0 fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe0022d08bf0 --- syscall (54, FreeBSD ELF64, sys_ioctl), rip = 0x80041929a, rsp = 0x7fffffffe748, rbp = 0x7fffffffec00 --- Looking at the code handling the SIOCSPFXFLUSH_IN6 ioctl(), it's clear that it's just trying to free every nd_prefix (excepting link-local prefixes), but what's less clear to me is what this should do instead. Should this only flush prefixes learned through NDP RAs? What do we do if a non-autoconf address is assigned from such a prefix?