From owner-freebsd-current@freebsd.org Mon Aug 17 08:03:04 2020 Return-Path: Delivered-To: freebsd-current@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 787AF3AA1EC for ; Mon, 17 Aug 2020 08:03:04 +0000 (UTC) (envelope-from hps@selasky.org) Received: from mail.turbocat.net (turbocat.net [88.99.82.50]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4BVRP32Wd8z4Lh3 for ; Mon, 17 Aug 2020 08:03:02 +0000 (UTC) (envelope-from hps@selasky.org) Received: from hps2020.home.selasky.org (unknown [178.17.145.105]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mail.turbocat.net (Postfix) with ESMTPSA id 5C3A82602CF; Mon, 17 Aug 2020 10:03:01 +0200 (CEST) Subject: Re: Kernel crash during video transcoding To: Alexandre Levy Cc: freebsd-current@freebsd.org References: <13793020-1bde-b13f-65e3-909e27d876ad@selasky.org> <4e9d9a89-4883-1f1c-c796-e5925fd171cc@selasky.org> <51a2fe4f-5a3e-8d24-19e2-3cdaa8378015@selasky.org> <5fe820c0-69af-8c41-69d6-a3c33ed55e2e@selasky.org> From: Hans Petter Selasky Message-ID: Date: Mon, 17 Aug 2020 10:02:39 +0200 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1597651383; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=UQnuXkOVYoDL/JvZ1R0/Zzn1yW5FNKMKkU+S3eFsuo8=; b=WgW9nPBdkeFbhsRnPFFhtTt8tcx48xasNvjbxHCR+QbA8ZIz3GR8duXtSwJUXb8fR2Tj4r 2LEBxO1mmx3pbrn2YVNoxAPgKLGscCxM9ZiUBDsDFSEtvT6OPy5pSpoM6rE0P1NDmzgap9 y5H70NWIuMG/gXu9YyMLOmi3CP5Nj+/uaxgd9FlH3l4Yf+bn0TZQ/PHpTJ7pvP98oJjrEr ra2VQPe4UKgHoo0GO7h0m6PUiSQbOPm+LOEHHdqMm73o73JexDLGSUxmaNyCmYlcaWwBfM zRUuR/0c/tn6oV/1BVcZdka9/7JV6CZmesEqORud7DWUnzFzEHg73F0kRN5Vqw== ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1597651383; a=rsa-sha256; cv=none; b=X4QKsc7fkEfUBefG8hddNz6q2yR8cWiZez40YckRjrqq7piRrTUVdDFZV1svdOkqMC1f9D H2Txc4/VFSTt18PU1Iwa7XFSDYvcQYyy+CvR7s1I/Q8+M4fZ9XxfR0FB4podnF4RnyWHuC p0/fncbUQnZjkTGCFGKX6jLT/irCKmtYwFJ/hBUPIWydPJ0ut3Lwl67u530uvJX4Hd5Fnx SWLaUzqmShQjw4px1KjohRaliphjBeYrg7z+bXe1sTVfOVTSL1d5hMv+9tZ0KYD9mjNHS4 eviutb5M2y5a2M5q/hjcXSogwiObIv1kAqvugI0pjXXUn6xr2fzJxc29ibTaRw== ARC-Authentication-Results: i=1; mx1.freebsd.org; dkim=none; spf=pass (mx1.freebsd.org: domain of hps@selasky.org designates 88.99.82.50 as permitted sender) smtp.mailfrom=hps@selasky.org X-Rspamd-Queue-Id: 4BVRP32Wd8z4Lh3 X-Spamd-Bar: -- X-Spamd-Result: default: False [-2.50 / 15.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; R_SPF_ALLOW(-0.20)[+a:mail.turbocat.net:c]; NEURAL_HAM_LONG(-0.98)[-0.976]; MIME_GOOD(-0.10)[text/plain]; ARC_SIGNED(0.00)[i=1]; DMARC_NA(0.00)[selasky.org]; TO_MATCH_ENVRCPT_SOME(0.00)[]; NEURAL_HAM_SHORT(-0.20)[-0.200]; RCPT_COUNT_TWO(0.00)[2]; NEURAL_HAM_MEDIUM(-1.03)[-1.026]; FREEMAIL_TO(0.00)[gmail.com]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:24940, ipnet:88.99.0.0/16, country:DE]; RCVD_COUNT_TWO(0.00)[2]; RCVD_TLS_ALL(0.00)[] X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 17 Aug 2020 08:03:04 -0000 On 2020-08-16 22:23, Alexandre Levy wrote: > (kgdb) p *m > $2 = {plinks = {q = {tqe_next = 0x578491b51dd60510, tqe_prev = > 0xd78c11bd9dde8518}, s = {ss = {sle_next = 0x578491b51dd60510}}, memguard = > {p = 6306325585301210384, > v = 15531808720989095192}, uma = {slab = 0x578491b51dd60510, zone = > 0xd78c11bd9dde8518}}, listq = {tqe_next = 0xd78c11bd9dde8518, tqe_prev = > 0x265bc92017d7aa38}, > object = 0x2659c92217d5aa3a, pindex = 2758957463725517354, phys_addr = > 2758957463725517354, md = {pv_list = {tqh_first = 0x2e49c1321fc5a22a, > tqh_last = 0x3e4bd1300fc7b228}, > pv_gen = 265794104, pat_mode = 1046204704}, ref_count = 257405624, > busy_lock = 1054593440, a = {{flags = 4757, queue = 48 '0', act_count = 134 > '\206'}, _bits = 2251297429}, > order = 98 'b', pool = 204 '\314', flags = 75 'K', oflags = 105 'i', > psind = -107 '\225', segind = 18 '\022', valid = 48 '0', dirty = 134 '\206'} This "m" structure looks freed. It looks like a use after free issue. Can you enter this in GDB: set print pretty on Then dump some more structures you can get hold of? --HPS