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[184.144.87.103]) by smtp.gmail.com with ESMTPSA id v92sm5048694qte.4.2020.05.21.08.46.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 May 2020 08:46:23 -0700 (PDT) Sender: Mark Johnston Date: Thu, 21 May 2020 11:46:21 -0400 From: Mark Johnston To: Paul Floyd Cc: FreeBSD Hackers Subject: Re: SIGBUS si_code 12 Message-ID: <20200521154621.GB85681@raichu> References: <2102917207.11671.1589487524169.JavaMail.www@wwinf1n11> <490544208.11847.1589489181927.JavaMail.www@wwinf1n11> <20200514224347.GB46537@kib.kiev.ua> <9840EA0E-CF11-4332-A5A0-A3CDBA0F0464@wanadoo.fr> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <9840EA0E-CF11-4332-A5A0-A3CDBA0F0464@wanadoo.fr> X-Rspamd-Queue-Id: 49SYrL0TL1z3fsT X-Spamd-Bar: - Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20161025 header.b=ihk2SDOG; dmarc=none; spf=pass (mx1.freebsd.org: domain of markjdb@gmail.com designates 2607:f8b0:4864:20::f2d as permitted sender) smtp.mailfrom=markjdb@gmail.com X-Spamd-Result: default: False [-1.37 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; R_SPF_ALLOW(-0.20)[+ip6:2607:f8b0:4000::/36]; RCVD_COUNT_THREE(0.00)[3]; TO_DN_ALL(0.00)[]; DKIM_TRACE(0.00)[gmail.com:+]; RCPT_COUNT_TWO(0.00)[2]; NEURAL_HAM_SHORT(-0.08)[-0.078]; FREEMAIL_TO(0.00)[wanadoo.fr]; FORGED_SENDER(0.30)[markj@freebsd.org,markjdb@gmail.com]; RECEIVED_SPAMHAUS_PBL(0.00)[184.144.87.103:received]; MIME_TRACE(0.00)[0:+]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US]; FROM_NEQ_ENVFROM(0.00)[markj@freebsd.org,markjdb@gmail.com]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-0.85)[-0.846]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20161025]; FROM_HAS_DN(0.00)[]; NEURAL_HAM_LONG(-0.74)[-0.743]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-hackers@freebsd.org]; DMARC_NA(0.00)[freebsd.org]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[2607:f8b0:4864:20::f2d:from]; MID_RHS_NOT_FQDN(0.50)[]; RCVD_TLS_ALL(0.00)[] X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 May 2020 15:46:27 -0000 On Fri, May 15, 2020 at 08:35:53AM +0200, Paul Floyd wrote: > > > > On 15 May 2020, at 00:43, Konstantin Belousov wrote: > > > >> > >> > >> So presumably this will go away in 12.2. > > I do not understand what do you mean. What should go away ? > > > > Also, T_PAGEFLT value for si_code is a compat value that should be > > explicitly enabled by user, for compatibility with some really old > > binaries. > > The undocumented behaviour of having a SIGBUS with an si_code that is normally for SIGSEGV. > > From what I’ve seen BUS_OOMERR will be used instead. Assuming that the context is valgrind, the issue is probably that the client program is being run with without a NT_FREEBSD_ABI_TAG note, so the kernel does not have p_osrel defined for the client process and thus reverts to the legacy behaviour of delivering SIGBUS with UCODE_PAGEFLT. This behaviour is not documented since it is only present for compatibility with old binaries. valgrind should probably embed the NT_FREEBSD_ABI_TAG note from the target executable into the client process somehow.