From owner-freebsd-bugs@freebsd.org Mon Dec 19 14:54:11 2016 Return-Path: Delivered-To: freebsd-bugs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 85FFDC88B62 for ; Mon, 19 Dec 2016 14:54:11 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 75E0C1657 for ; Mon, 19 Dec 2016 14:54:11 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from bugs.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id uBJEsBpA002264 for ; Mon, 19 Dec 2016 14:54:11 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 214923] kqueue hangs with busy loop Date: Mon, 19 Dec 2016 14:54:11 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 11.0-RELEASE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: yjh0502@gmail.com X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: freebsd-bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 19 Dec 2016 14:54:11 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D214923 --- Comment #18 from yjh0502@gmail.com --- (In reply to Konstantin Belousov from comment #17) Yes, I believe that both hangs/panic is caused by the same problem, as both symptom could be reproduced by same procedure. I made a simple script to reproduce the problem on both GENERIC/debug kerne= ls, 10.3 and 11.0. I reproduced and observed the problem by - running 'top' on console and start following script via ssh, or - running 'top' and following script on 'tmux' I can reproduce the problem almost instantly after running the script. If y= ou cannot reproduce the problem, try to re-run the script several times after cleaning up processes using 'pkill watchman xargs'. 'watchman' command can be installed with 'pkg'. https://gist.github.com/yjh0502/1355939dc89a055029d1161e5501a50a #!/usr/bin/env bash mkdir -p foo bar seq -w 0 100 | xargs -n1 -I{} touch foo/{}.c echo '["subscribe","./","mysub",{"fields":["name"],"expression":["allof",["type"= ,"f"],["not","empty"],["suffix","c"]]}]' | watchman -p -j --server-encoding=3Djson > /dev/null & while true; do find bar/ -type f | xargs -n1 -P5 -I'{}' mv '{}' foo; done & while true; do find foo/ -type f | xargs -n1 -P5 -I'{}' mv '{}' bar; done & wait --=20 You are receiving this mail because: You are the assignee for the bug.=