From owner-freebsd-hackers@freebsd.org Thu Sep 24 17:41:48 2015 Return-Path: Delivered-To: freebsd-hackers@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 0851FA08719 for ; Thu, 24 Sep 2015 17:41:48 +0000 (UTC) (envelope-from markjdb@gmail.com) Received: from mail-qk0-x22a.google.com (mail-qk0-x22a.google.com [IPv6:2607:f8b0:400d:c09::22a]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id B780A1BFB for ; Thu, 24 Sep 2015 17:41:47 +0000 (UTC) (envelope-from markjdb@gmail.com) Received: by qkdw123 with SMTP id w123so32687882qkd.0 for ; Thu, 24 Sep 2015 10:41:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=sender:date:from:to:cc:subject:message-id:references:mime-version :content-type:content-disposition:in-reply-to:user-agent; bh=iqTzwZr/zQt/NYFZuAsS4a+I3ThG9b/1p1Wf0A471Sw=; b=WYKQ/9zZqMJ9tWB82ciEZiJejUgp2u+ByuDUXMBxkA0GCaFF2SOStizICqaqWPhNnD c9B/AzFq+vE+bQKjZnr3O3fdec05PnWEHnyyEH7U2+Awu7asEnGBBfuy2bGAsI7HpYIv NzkuOSi7xGgQpibsuC6Pl1VBW490MMoIE+hgYRPkEORdGY+A+S7Br3XiM7JbQuiPcAlz Z4H+l1M+tlg3NiiSAHU29PWQo/1WYV16jWSVElCBc+Jd5O5EKVvopyZo1qyvXa++UD+Q 94KaBa5rGZJXGa5fjzC/zNnep0WzapLB+/zJ8Kv7LkVknJpM1eeY/srtSNvjxcyf6WM+ tSSA== X-Received: by 10.55.17.12 with SMTP id b12mr1123519qkh.69.1443116506867; Thu, 24 Sep 2015 10:41:46 -0700 (PDT) Received: from muskytusk ([104.236.250.12]) by smtp.gmail.com with ESMTPSA id t48sm3851188qgd.15.2015.09.24.10.41.45 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 24 Sep 2015 10:41:46 -0700 (PDT) Sender: Mark Johnston Date: Thu, 24 Sep 2015 17:41:11 +0000 From: Mark Johnston To: suresh gumpula Cc: "freebsd-hackers@freebsd.org" Subject: Re: system map mutex and zone mutex witness warning Message-ID: <20150924173916.GA78083@muskytusk> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.23 (2014-03-12) X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 24 Sep 2015 17:41:48 -0000 On Wed, Sep 23, 2015 at 11:04:19PM -0400, suresh gumpula wrote: > Hi, > I am seeing the following witness warning while booting on 8.1. Is > it a known issue and > resolved in later kernels ? Can somebody please comment on this ? I've seen this occur when multiple threads race to establish a lock order: https://svnweb.freebsd.org/changeset/base/284127 The change should apply to 8.1, but there may be other relevant bug fixes missing. > > isitmychild: rmatrix mismatch between system map (index 43) and UMA zone > (index 57): w_rmatrix[43][57] == 1 but w_rmatrix[57][43] == 0 > KDB: stack backtrace: > kdb_backtrace() at kdb_backtrace+0x3e > witness_line() at witness_line+0xca4 > witness_line() at witness_line+0xcf9 > witness_releaseok() at witness_releaseok+0x1623 > witness_checkorder() at witness_checkorder+0x37e > _mtx_lock_flags() at _mtx_lock_flags+0x113 > uma_zalloc_arg() at uma_zalloc_arg+0x1449 > vmspace_swap_count() at vmspace_swap_count+0xc52 > uma_zalloc_arg() at uma_zalloc_arg+0x10e6 > uma_zalloc_arg() at uma_zalloc_arg+0x5ef > vmspace_alloc() at vmspace_alloc+0x180 > vm_map_init() at vm_map_init+0xec > vm_map_insert() at vm_map_insert+0x4cb > kmem_malloc() at kmem_malloc+0x3de > zone_drain() at zone_drain+0x822 > uma_large_malloc() at uma_large_malloc+0x4e > malloc() at malloc+0x251 > swap_pager_swap_init() at swap_pager_swap_init+0x219 > vm_pageout_oom() at vm_pageout_oom+0x952 > fork_exit() at fork_exit+0x185 > fork_trampoline() at fork_trampoline+0xe > --- trap 0, rip = 0, rsp = 0xffffff806bb61d30, rbp = 0 --- > Witness disabled. > > > Thanks > Suresh > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org"