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Mon, 26 Aug 2019 14:35:26 -0700 (PDT) Received: from [10.0.31.67] ([12.25.173.26]) by smtp.gmail.com with ESMTPSA id a186sm13858559pge.0.2019.08.26.14.35.25 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 26 Aug 2019 14:35:26 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (1.0) Subject: Re: Kernel-Crash when working with ubt0 From: maksim yevmenkin X-Mailer: iPhone Mail (16G77) In-Reply-To: Date: Mon, 26 Aug 2019 14:35:25 -0700 Cc: Hans Petter Selasky , "mms.vanbreukelingen@gmail.com" , "freebsd-current@freebsd.org" Content-Transfer-Encoding: quoted-printable Message-Id: <00E772F0-7231-44C4-B314-26730CC7DF21@gmail.com> References: <47509401.1440476.1566796167857.ref@mail.yahoo.com> <47509401.1440476.1566796167857@mail.yahoo.com> <5aa8faeb-5e8e-38be-4301-81f3d82c494a@selasky.org> To: Warner Losh X-Rspamd-Queue-Id: 46HQKD2v63z3x9N X-Spamd-Bar: --- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20161025 header.b=dQdUVzQ2; 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PREVIOUSLY_DELIVERED(0.00)[freebsd-current@freebsd.org]; MIME_GOOD(-0.10)[text/plain]; IP_SCORE_FREEMAIL(0.00)[]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[9.2.5.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.b.8.f.7.0.6.2.list.dnswl.org : 127.0.5.0]; IP_SCORE(0.00)[ip: (-9.37), ipnet: 2607:f8b0::/32(-2.86), asn: 15169(-2.33), 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: Mon, 26 Aug 2019 21:35:29 -0000 > On Aug 26, 2019, at 9:14 AM, Warner Losh wrote: >=20 > Is it from read_connection_list? If so I have a 'patch' that I'm using but= > haven't committed because it's just too gross: drop the lock before the > copyout and pick it up again after... >=20 Hmm... interesting....=20 I only took a brief look at it. I suppose I can ensure user space address is= wired and then copyout() can be called with mutex held It=E2=80=99s odd that I=E2=80=99ve never seen this before. I=E2=80=99m trave= ling at the moment will take a closer look this later this week Thanks Max=