From owner-freebsd-current@freebsd.org Wed Nov 7 04:35:07 2018 Return-Path: Delivered-To: freebsd-current@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 37448110BE54 for ; Wed, 7 Nov 2018 04:35:07 +0000 (UTC) (envelope-from markjdb@gmail.com) Received: from mail-it1-x133.google.com (mail-it1-x133.google.com [IPv6:2607:f8b0:4864:20::133]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 8BA5F8000A for ; Wed, 7 Nov 2018 04:35:06 +0000 (UTC) (envelope-from markjdb@gmail.com) Received: by mail-it1-x133.google.com with SMTP id b7-v6so21177053itd.5 for ; Tue, 06 Nov 2018 20:35:06 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=mpXdSzBmwCkq7GiJp46Wm3mKpydMfJuEIf+LwY5dUJI=; b=cz43Tq1OKqfekAPYXgJeLga8NvADpRZlehG+3l5x4VzXywo90PTbytOCo3bryf1FlH V+regd8f8yB3ZvRAKg7/+leaJP2oiPdCESuNWd/q0kRsmT4k4m8YTfNHNWcE/nWE0sxT yHaBzeziTYm+uj6zdoy7thpBjsFGrCcWKETN47dOblLKP++GkwoXzBhZwC1JUH4WJfue lBPH+5QbdlPkBILAqMFKlDI06+jAyuzBmftLaOuGWccjBGa4X9B1cpx1ggxxu7B1aPwC taUtSbJarlrnt1UzQt6Vdp+GtFDdGNbNwZJTfqRfkVOBHh9OZgT/oFljXbzk8xErYOtE gWiQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:from:to:cc:subject:message-id :references:mime-version:content-disposition:in-reply-to:user-agent; bh=mpXdSzBmwCkq7GiJp46Wm3mKpydMfJuEIf+LwY5dUJI=; b=X6a/4a3kGeeA4R3l3gQlWz+bjYFTprVU/F1YdEBetkuqKdELfeumq2vkW5cgoR/zI9 35mEl4+pkeyhQrpZlvkJRmnjuiVQ4ELuoqD37WQzSxlNRhyPgHNFG9YSsZDA/TcJA9+N Fwx6yPnN+j62N9zYvrlujfOtk2HwTyS+1GpTy36yLAwCozBuhvxTgPUPbBvDdXHunQkH fm51SRHUT+czynuDgq3SKfs/Bmb2NQJtksiRCRGCqqf3Kza+mGLwLf9M1SnK4rZuCZez 1y7kyblUcKw3pS7w81mKUSvyzuxFrqkDSjYUO0l4i3EgpezXHBzWYUyXUdcoZDQ6COdU ARJw== X-Gm-Message-State: AGRZ1gK1LAOD7MuUhwWKQM6TDmCucN7/SKHk+RbSGKB13VB0N4PcjMtp nj2GYrnJ/C6fufbaaXzILFtTJVAC X-Google-Smtp-Source: AJdET5cwQ8VQAc/iGEE84rP0mojX5jfy52O4B6jR4nZLW0guVtd/NHfgWgNj+/CtN5ZYr/qRa/hOOQ== X-Received: by 2002:a24:7942:: with SMTP id z63-v6mr595232itc.140.1541565305847; Tue, 06 Nov 2018 20:35:05 -0800 (PST) Received: from raichu (toroon0560w-lp130-08-67-71-176-199.dsl.bell.ca. [67.71.176.199]) by smtp.gmail.com with ESMTPSA id 10-v6sm1901657itl.32.2018.11.06.20.35.04 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 06 Nov 2018 20:35:05 -0800 (PST) Sender: Mark Johnston Date: Tue, 6 Nov 2018 23:35:03 -0500 From: Mark Johnston To: Sylvain GALLIANO Cc: freebsd-current@freebsd.org Subject: Re: Panic on kern_event.c Message-ID: <20181107043503.GB30861@raichu> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) X-Rspamd-Queue-Id: 8BA5F8000A X-Spamd-Result: default: False [-3.03 / 200.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; R_DKIM_ALLOW(-0.20)[gmail.com]; NEURAL_HAM_MEDIUM(-0.99)[-0.988,0]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; R_SPF_ALLOW(-0.20)[+ip6:2607:f8b0:4000::/36]; NEURAL_HAM_LONG(-1.00)[-0.998,0]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-current@freebsd.org]; DMARC_NA(0.00)[freebsd.org]; NEURAL_HAM_SHORT(-0.79)[-0.792,0]; RCVD_COUNT_THREE(0.00)[3]; TO_MATCH_ENVRCPT_SOME(0.00)[]; DKIM_TRACE(0.00)[gmail.com:+]; RCPT_COUNT_TWO(0.00)[2]; RCVD_IN_DNSWL_NONE(0.00)[3.3.1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.b.8.f.7.0.6.2.list.dnswl.org : 127.0.5.0]; MX_GOOD(-0.01)[cached: alt3.gmail-smtp-in.l.google.com]; RCVD_TLS_LAST(0.00)[]; FORGED_SENDER(0.30)[markj@freebsd.org,markjdb@gmail.com]; MID_RHS_NOT_FQDN(0.50)[]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US]; FROM_NEQ_ENVFROM(0.00)[markj@freebsd.org,markjdb@gmail.com]; IP_SCORE(-0.54)[ipnet: 2607:f8b0::/32(-1.22), asn: 15169(-1.41), country: US(-0.09)] X-Rspamd-Server: mx1.freebsd.org 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: Wed, 07 Nov 2018 04:35:07 -0000 On Tue, Nov 06, 2018 at 10:50:06AM +0100, Sylvain GALLIANO wrote: > Hi, > > I got random panic on Current & 11.2-STABLE on kern_event.c > > Panic occur in syslog-ng (logging at high rate) with the folloging lines: > > Panic String: Bad tailq NEXT(0xfffff80039ae7a38->tqh_last) != NULL > Panic String: Bad tailq head 0xfffff80039f1a238 first->prev != head > > It's look like knote_enqueue try to add and existings knote on TAILQ > (confirmed by following patch). > > logs after apply patch: > XXX knote 0xfffff8012e3d33c0 already in tailq status:1 kq_count:1 [0 > 0xfffff800327d3538] 2671 > XXX knote 0xfffff80032861780 already in tailq status:1 kq_count:1 [0 > 0xfffff80032457938] 2671 Can you grab the stack when this happens as well, with kdb_backtrace()? Or better, convert the print into a panic so that we can examine the kernel dump.