From nobody Tue Jan 24 16:15:46 2023 X-Original-To: freebsd-dtrace@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4P1XBw5Yhhz30yYd for ; Tue, 24 Jan 2023 16:15:52 +0000 (UTC) (envelope-from markjdb@gmail.com) Received: from mail-il1-x12a.google.com (mail-il1-x12a.google.com [IPv6:2607:f8b0:4864:20::12a]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "GTS CA 1D4" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4P1XBw27pwz3HZ3 for ; Tue, 24 Jan 2023 16:15:52 +0000 (UTC) (envelope-from markjdb@gmail.com) Authentication-Results: mx1.freebsd.org; none Received: by mail-il1-x12a.google.com with SMTP id g16so1753542ilr.1 for ; Tue, 24 Jan 2023 08:15:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:sender:from:to:cc:subject:date:message-id :reply-to; bh=N38FsS8tSnAs6n3VIGUS211qVYaLm5Kj2/WypwExfwI=; b=N5ihvJHhArkvQWeFWv9opK1ATLV9h10CIzAvIkWukOJo6x5UNOdEDIT/SFLue7W1bj 4KECcMwpjlLx/iY0ntyg4JZ2pPNI40u1Xo00vCblsSS5zkDrrbl/fQOWjK5QpS1YLcxq s0rMjPJfjiP+TGptB5Yi9YWcS3rQSoFA8q3kM8Bstk7YvzTtd6in/k/j1d4grFS5hesu id66/uj256iUJZoUf4hyZ0Km048oUatQWU6j2+twWUldOGy4BlQUcdEQ0ZpbdRrv3Niu t+OgPGxGkuy6qysQRPhdZkDcEyhS5NS5b5DkZpnDBaUw2rH32yt1PZxq00V2+NVzIibY lFhQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:sender:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=N38FsS8tSnAs6n3VIGUS211qVYaLm5Kj2/WypwExfwI=; b=Hc5WlfacXZES1fKfYBxo3vlG9oBZg+/rR4PFDJObsjWNKK87Pt8N+Bz0OeW0w+Fffa e4gHhAeBu7gLsLxX/sIKb3Tbirij74E6VDXJXzAp7HmRtaf7LXy9wYNk4o9aWa1irEgQ NxcMAh0BLP3tNQT3PvRzoP05oV8AejnAbbygnov4+Nss+43jDfcsF+dF7WmCrMfosj2V xxRIi9FtlrGZr4MiNhGnTg4ytrAdKqRCb5szHdYWSOzRysUTHlKOgQ/qoPBvAuJO6mhD P7kkrj+YSNIzgYiHtrb6pI21DQuL5Ve9dfPdnQwEyMVd0CAY1ZXmIc7u0jJMrna5x+XT z6Ww== X-Gm-Message-State: AFqh2kqYZh6pNACgJewKrfo1PbYXfvbz5l1t38LOC0bYAQ8iP8bgHyvh 6VpuXx7eGMO/t0KaFEUZsmPB6WZY5gw= X-Google-Smtp-Source: AMrXdXub2pfVCAqB1WryMiOnY25GEERaNefoEwuKlOHjrKw1zTuG9swogOp+XjOqq21FQdVEP5dWjw== X-Received: by 2002:a92:c048:0:b0:30c:54a1:e5d8 with SMTP id o8-20020a92c048000000b0030c54a1e5d8mr22225799ilf.30.1674576951011; Tue, 24 Jan 2023 08:15:51 -0800 (PST) Received: from nuc (192-0-220-237.cpe.teksavvy.com. [192.0.220.237]) by smtp.gmail.com with ESMTPSA id bq9-20020a056638468900b003a7cb4337c4sm777050jab.137.2023.01.24.08.15.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 24 Jan 2023 08:15:50 -0800 (PST) Date: Tue, 24 Jan 2023 11:15:46 -0500 From: Mark Johnston To: Martin Cracauer Cc: freebsd-dtrace@freebsd.org Subject: Re: DTrace - capturing two userspace strack frames on top of system call 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: 4P1XBw27pwz3HZ3 X-Spamd-Bar: ---- X-Spamd-Result: default: False [-4.00 / 15.00]; REPLY(-4.00)[]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US] X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-ThisMailContainsUnwantedMimeParts: N On Mon, Jan 23, 2023 at 04:54:05PM -0500, Martin Cracauer wrote: > Mark Johnston wrote on Mon, Jan 23, 2023 at 11:52:12AM -0500: > > On Sun, Jan 22, 2023 at 10:04:50PM -0500, Martin Cracauer wrote: > > > Actually the error only appears on arm64 for me. I moved the script > > > to amd64 and it works as I thought. > > > > Support for userspace tracing on arm64 is definitely less mature than on > > amd64, so this isn't too surprising, unfortunately. > > > > Is the problem reproducible with a trivial program compiled with > > -fno-omit-frame-pointer? > > Yes: > $ gcc -O2 -fno-omit-frame-pointer -Wall -Werror -o crasparse crasparse.c > # dtrace -n 'syscall::write*:entry /arg1/ { @traces[ustack()] = count(); }' -c ./crasparse > dtrace: error on enabled probe ID 1 (ID 57136: syscall:freebsd:writev:entry): invalid address (0x0) in action #2 > [...] > > Should I make a bugzilla entry out of this? Yes please, that would be helpful.