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[198.84.189.58]) by smtp.gmail.com with ESMTPSA id y15sm16579534qkp.22.2022.02.14.05.53.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 14 Feb 2022 05:53:34 -0800 (PST) Date: Mon, 14 Feb 2022 08:53:31 -0500 From: "markj@FreeBSD.org" To: Amit kumar Cc: "freebsd-dtrace@FreeBSD.org" Subject: Re: dtrace fails to trace on FreeBSD-14(CURRENT) with ASLR and W^X Message-ID: References: List-Id: A discussion list for developers working on DTrace in FreeBSD List-Archive: https://lists.freebsd.org/archives/freebsd-dtrace List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-dtrace@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Queue-Id: 4Jy5Kf2QLGz548h X-Spamd-Bar: - Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20210112 header.b=RrjL3z1z; dmarc=none; spf=pass (mx1.freebsd.org: domain of markjdb@gmail.com designates 2607:f8b0:4864:20::732 as permitted sender) smtp.mailfrom=markjdb@gmail.com X-Spamd-Result: default: False [-1.70 / 15.00]; TO_DN_EQ_ADDR_SOME(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; TO_DN_SOME(0.00)[]; R_SPF_ALLOW(-0.20)[+ip6:2607:f8b0:4000::/36:c]; RCVD_COUNT_THREE(0.00)[3]; DKIM_TRACE(0.00)[gmail.com:+]; RCPT_COUNT_TWO(0.00)[2]; NEURAL_HAM_SHORT(-1.00)[-1.000]; FREEMAIL_TO(0.00)[hotmail.com]; FORGED_SENDER(0.30)[markj@freebsd.org,markjdb@gmail.com]; 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]; DWL_DNSWL_NONE(0.00)[gmail.com:dkim]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20210112]; FROM_DN_EQ_ADDR(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-dtrace@freebsd.org]; DMARC_NA(0.00)[freebsd.org]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[2607:f8b0:4864:20::732:from]; MLMMJ_DEST(0.00)[freebsd-dtrace]; MID_RHS_NOT_FQDN(0.50)[]; RCVD_TLS_ALL(0.00)[] X-ThisMailContainsUnwantedMimeParts: N On Mon, Feb 14, 2022 at 11:03:47AM +0000, Amit kumar wrote: > Encountered this issue while running https://github.com/freebsd/freebsd-src/blob/main/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/tst.emptystack.d > > a somewhat simpler method to reproduce > > configuration > file /usr/bin/find > /usr/bin/find: ELF 64-bit LSB shared object, x86-64, <.....> > > kern.elf64.allow_wx: 0 > kern.elf64.aslr.pie_enable: 1 > kern.elf64.aslr.enable: 1 Does the problem persist with allow_wx = 1? > # dtrace -n pid92817:::entry > dtrace: description 'pid92817:::entry' matched 4380 probes > [2] + trace trap (core dumped) exec find / > /dev/null 2>&1 > > # exec find / > /dev/null 2>&1 & > [1] 85293 > # dtrace -n pid85293:a.out:: > dtrace: description 'pid85293:a.out::' matched 6828 probes > [1] + trace trap (core dumped) exec find / > /dev/null 2>&1 > CPU ID FUNCTION:NAME > 1 89149 find_execute:1f8 > > looking at find core in gdb > (gdb) p $_siginfo > $1 = { > si_signo = 5, > si_errno = 0, > si_code = 3, > . > . > . > > Can someone help me understand why am I seeing core due to SIGTRAP TRAP_DTRACE ? > > Regards > Amit