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[76.126.107.221]) by smtp.gmail.com with ESMTPSA id w134sm2314109pfd.41.2020.03.30.19.48.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 30 Mar 2020 19:48:02 -0700 (PDT) Sender: Theron Tarigo Subject: Re: USB microphones with FreeBSD-CURRENT: bug 194727, r358629 To: Graham Perrin Cc: freebsd-current@freebsd.org References: <5c93c4d2-897b-0671-b29a-9fde6031adf5@gmail.com> <6467df72-92de-64b5-5a2c-f23b415543b1@gmail.com> <8dc58802-5849-93c2-0ba2-e321a589e6a3@gmail.com> <28c59a7f-8f9e-4a33-2546-5b97c0c4f33d@gmail.com> From: Theron Message-ID: <3405369e-2c79-6064-b52b-34502edfd40b@gmail.com> Date: Mon, 30 Mar 2020 22:47:42 -0400 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <28c59a7f-8f9e-4a33-2546-5b97c0c4f33d@gmail.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-Rspamd-Queue-Id: 48rtzw3Nhqz45m2 X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20161025 header.b=ETaxm2SU; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (mx1.freebsd.org: domain of therontarigo@gmail.com designates 2607:f8b0:4864:20::643 as permitted sender) smtp.mailfrom=therontarigo@gmail.com X-Spamd-Result: default: False [-3.00 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; TO_DN_SOME(0.00)[]; R_SPF_ALLOW(-0.20)[+ip6:2607:f8b0:4000::/36]; FREEMAIL_FROM(0.00)[gmail.com]; RCVD_COUNT_THREE(0.00)[3]; DKIM_TRACE(0.00)[gmail.com:+]; RCPT_COUNT_TWO(0.00)[2]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; FREEMAIL_TO(0.00)[gmail.com]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; FREEMAIL_ENVFROM(0.00)[gmail.com]; RECEIVED_SPAMHAUS_PBL(0.00)[221.107.126.76.khpj7ygk5idzvmvt5x4ziurxhy.zen.dq.spamhaus.net : 127.0.0.10]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US]; TAGGED_FROM(0.00)[]; DWL_DNSWL_NONE(0.00)[gmail.com.dwl.dnswl.org : 127.0.5.0]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20161025]; MID_RHS_MATCH_FROM(0.00)[]; FROM_HAS_DN(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-current@freebsd.org]; IP_SCORE_FREEMAIL(0.00)[]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[3.4.6.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.b.8.f.7.0.6.2.list.dnswl.org : 127.0.5.0]; IP_SCORE(0.00)[ip: (-0.02), ipnet: 2607:f8b0::/32(-0.35), asn: 15169(-0.45), country: US(-0.05)]; RCVD_TLS_ALL(0.00)[] X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.29 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: Tue, 31 Mar 2020 02:48:22 -0000 On 2020-03-30 20:08, Graham Perrin wrote: > Theron, thank you! That might explain a recent sense of randomness > with the symptoms. I've been testing in three different boot > environments, only one of which is above the 358629 at > : I don't know what would be attaching to mixer before login.  For me the problem is predictable: suspending after I've opened a player reliably hangs kernel, and killing every user of /dev/dsp* /dev/mixer* before sleep reliably avoids the problem.  Maybe something is attaching on startup. > (In retrospect, most remarkable to me was that the bug could bite > before logging in; taking the 'Sleep' option in sddm did not lead to a > suspend of the system. Hopefully fixed for FreeBSD-CURRENT by r358629; > I'll not test now, maybe later in the week.) As I understand it, r358629 adds a mechanism that applications can use to "do the right thing" but does not fix the underlying kernel vulnerability. Theron