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Fri, 03 Jul 2026 04:50:01 -0700 (PDT) List-Id: Networking and TCP/IP with FreeBSD List-Archive: https://lists.freebsd.org/archives/freebsd-net List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-net@FreeBSD.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 References: <063d3176-2c6f-4692-8cf0-6f454f32aff0@FreeBSD.org> In-Reply-To: <063d3176-2c6f-4692-8cf0-6f454f32aff0@FreeBSD.org> From: Takahiro Kurosawa Date: Fri, 3 Jul 2026 20:49:51 +0900 X-Gm-Features: AVVi8CfAuBy0MNFW16N3XAzl7fuD-8Oi_6EstBaqILwy3mluI7mw0BxWivGcvJk Message-ID: Subject: Re: if_ovpn: Fatal trap 12: page fault while in kernel mode To: Mark Felder , freebsd-net@freebsd.org Content-Type: text/plain; charset="UTF-8" X-Spamd-Result: default: False [-4.68 / 15.00]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; ARC_ALLOW(-1.00)[google.com:s=arc-20260327:i=1]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.68)[-0.679]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20251104]; R_SPF_ALLOW(-0.20)[+ip6:2607:f8b0:4864::/56:c]; MIME_GOOD(-0.10)[text/plain]; TAGGED_FROM(0.00)[]; RCVD_TLS_LAST(0.00)[]; RCPT_COUNT_TWO(0.00)[2]; TO_DN_SOME(0.00)[]; MIME_TRACE(0.00)[0:+]; FREEMAIL_ENVFROM(0.00)[gmail.com]; FREEMAIL_FROM(0.00)[gmail.com]; FROM_HAS_DN(0.00)[]; RCVD_COUNT_ONE(0.00)[1]; DWL_DNSWL_NONE(0.00)[gmail.com:dkim]; PREVIOUSLY_DELIVERED(0.00)[freebsd-net@freebsd.org]; TO_MATCH_ENVRCPT_SOME(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; DKIM_TRACE(0.00)[gmail.com:+]; MID_RHS_MATCH_FROMTLD(0.00)[]; MISSING_XM_UA(0.00)[]; MLMMJ_DEST(0.00)[freebsd-net@freebsd.org]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US]; RCVD_IN_DNSWL_NONE(0.00)[2607:f8b0:4864:20::f2a:from] X-Spamd-Bar: ---- X-Rspamd-Queue-Id: 4gsBrX0Cp0z4Jgx On Sat, 27 Jun 2026 13:43:37 -0700 Mark Felder wrote: > I did some digging and thought that perhaps this commit was the fix, so > I updated from 15.0-RELEASE to 15.1-RELEASE: > https://cgit.freebsd.org/src/commit/sys/net/if_ovpn.c?h=stable/15&id=04a7134c1e92c7752ffdc665f99ae26db70866c0 > > Unfortunately it did not fix it and I have a feeling that a similar bug > is lurking elsewhere in the if_ovpn driver. Can someone clarify if this > is an outstanding bug that needs further investigation or if it's > potentially already addressed in CURRENT? It seems that the problem is not in if_ovpn but in pf, that is the caller of ovpn_output. I have been able to reproduce the similar crash on 16-CURRENT, so I guess the problem still exists in CURRENT. I've posted a review that fixes the crash with a reproducing test script: https://reviews.freebsd.org/D58021 The patch can be applied also for the 15.1-RELEASE src tree, but I have only tested it on CURRENT. > Fatal trap 12: page fault while in kernel mode > cpuid = 0; apic id = 00 > fault virtual address = 0x0 > fault code = supervisor read data, page not present > instruction pointer = 0x20:0xffffffff81093c4a > stack pointer = 0x28:0xfffffe0067d621e0 > frame pointer = 0x28:0xfffffe0067d621e0 > code segment = base 0x0, limit 0xfffff, type 0x1b > = DPL 0, pres 1, long 1, def32 0, gran 1 > processor eflags = interrupt enabled, resume, IOPL = 0 > current process = 12 (irq129: ahci0) > rdi: fffff801338840ee rsi: 0000000000000000 rdx: 0000000000000267 > rcx: 0000000000000267 r8: 00000000000000c1 r9: fffff800312f7000 > rax: fffff801338840ee rbx: fffff80001eb6200 rbp: fffffe0067d621e0 > r10: fffff80031259000 r11: fffff8003123248c r12: 0000000000000001 > r13: fffff80001de2700 r14: fffff80001de2700 r15: fffff80001b21100 > trap number = 12 > panic: page fault > cpuid = 0 > time = 1782496026 > KDB: stack backtrace: > #0 0xffffffff80bd609d at kdb_backtrace+0x5d > #1 0xffffffff80b86c06 at vpanic+0x136 > #2 0xffffffff80b86ac3 at panic+0x43 > #3 0xffffffff81097fcd at trap_pfault+0x37d > #4 0xffffffff8106e568 at calltrap+0x8 > #5 0xffffffff80c265cb at m_unshare+0x36b > #6 0xffffffff82e9ed7b at ovpn_output+0x2b > #7 0xffffffff82e4ffdf at pf_route+0x89f > #8 0xffffffff82e4693a at pf_test+0xd0a > #9 0xffffffff82e62e6e at pf_check_out+0x2e > #10 0xffffffff80cda688 at pfil_mbuf_out+0x38 > #11 0xffffffff80d59e2e at ip_output+0xc7e > #12 0xffffffff8255f92b at rack_output+0x4afb > #13 0xffffffff80d85602 at tcp_usr_ready+0x182 > #14 0xffffffff80b84da5 at sendfile_iodone+0x115 > #15 0xffffffff80f534df at vnode_pager_generic_getpages_done_async+0x3f > #16 0xffffffff80c510f1 at bufdone+0x41 > #17 0xffffffff80abd317 at g_io_deliver+0x2a7 > Timeout initializing vt_vga > Uptime: 1h14m9s ---- KUROSAWA, Takahiro