From owner-freebsd-current@freebsd.org Wed May 1 12:56:24 2019 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 962EE1596621 for ; Wed, 1 May 2019 12:56:24 +0000 (UTC) (envelope-from asomers@gmail.com) Received: from mail-lj1-f169.google.com (mail-lj1-f169.google.com [209.85.208.169]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "GTS CA 1O1" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 7381774F91 for ; Wed, 1 May 2019 12:56:23 +0000 (UTC) (envelope-from asomers@gmail.com) Received: by mail-lj1-f169.google.com with SMTP id f23so15437090ljc.0 for ; Wed, 01 May 2019 05:56:23 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=BfMABlBib/nXbGkrNzMBMCgoPnyy/iUFJJEXOdRSB5c=; b=cUqUailu0e0+4rXRvqXgjBthnvRMdTmtTMjOvgpTTyRA/e7PE3JtEQfHFLe9JlAAae 2dcbvwiECb3sbOHeo8aqGGZSazl+b86npQYz1XcZLIV+ti+52h0T5p1kaFWqrx65hLJd tgpQIsEKquVzrLXeldmtUe+0H4QXI+gF+4/sOYqxMmizzOm0dOXYyt7nIsM5gM4gS26t DtYpu/ujvW14/oNAMvLRuqpJjcaFWUuvgdu9Otmh2bZkDxg8l/4+MnCZgYTPcQLREw7X MVfwjghIO7fv8WIlqBgCHAGrESkN8kjSB/4Rb/ATPiN2XMMCKPTiuBuFM9DoLrwV83uw Gnng== X-Gm-Message-State: APjAAAWQHCMbEDwvuNNV54xPcm7gRAKFYG4FM38Vr0X8AirZvpl0DcyP FWlFpBiXgI/9TWkngZ/3MJP5jSGtHviNMZn3F52GFilq X-Google-Smtp-Source: APXvYqyULaWV/HiI5VUao8Uz7a+YmDZgpvw7AZ6bmibTLPJHL5taehMLpHwpyRV+xxbZFLM3VWW2MrX/8d4MLxTZsHM= X-Received: by 2002:a2e:9d99:: with SMTP id c25mr6412608ljj.29.1556715375859; Wed, 01 May 2019 05:56:15 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Alan Somers Date: Wed, 1 May 2019 06:56:04 -0600 Message-ID: Subject: Re: backtrace on current.. To: Michelle Sullivan Cc: freebsd-current Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: 7381774F91 X-Spamd-Bar: ---- Authentication-Results: mx1.freebsd.org; spf=pass (mx1.freebsd.org: domain of asomers@gmail.com designates 209.85.208.169 as permitted sender) smtp.mailfrom=asomers@gmail.com X-Spamd-Result: default: False [-4.18 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; FROM_HAS_DN(0.00)[]; R_SPF_ALLOW(-0.20)[+ip4:209.85.128.0/17]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-current@freebsd.org]; DMARC_NA(0.00)[freebsd.org]; MIME_TRACE(0.00)[0:+]; TO_DN_ALL(0.00)[]; MX_GOOD(-0.01)[cached: alt3.gmail-smtp-in.l.google.com]; RCPT_COUNT_TWO(0.00)[2]; RCVD_IN_DNSWL_NONE(0.00)[169.208.85.209.list.dnswl.org : 127.0.5.0]; NEURAL_HAM_SHORT(-0.83)[-0.831,0]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_TLS_LAST(0.00)[]; FORGED_SENDER(0.30)[asomers@freebsd.org,asomers@gmail.com]; R_DKIM_NA(0.00)[]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:209.85.128.0/17, country:US]; FROM_NEQ_ENVFROM(0.00)[asomers@freebsd.org,asomers@gmail.com]; IP_SCORE(-1.33)[ip: (-0.53), ipnet: 209.85.128.0/17(-3.85), asn: 15169(-2.24), country: US(-0.06)]; RCVD_COUNT_TWO(0.00)[2] 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, 01 May 2019 12:56:24 -0000 On Wed, May 1, 2019 at 5:18 AM Michelle Sullivan wrote: > > FYI - newly installed: > > lock order reversal: > 1st 0xfffff80004f77608 ufs (ufs) @ /usr/src/sys/kern/vfs_lookup.c:713 > 2nd 0xfffffe000080edc0 bufwait (bufwait) @ > /usr/src/sys/ufs/ffs/ffs_vnops.c:283 > 3rd 0xfffff80006aff248 ufs (ufs) @ /usr/src/sys/kern/vfs_subr.c:2598 > stack backtrace: > #0 0xffffffff80c48773 at witness_debugger+0x73 > #1 0xffffffff80c484bd at witness_checkorder+0xa7d > #2 0xffffffff80bb45dd at lockmgr_xlock_hard+0x6d > #3 0xffffffff80bb505e at __lockmgr_args+0x5fe > #4 0xffffffff80ef4365 at ffs_lock+0xa5 > #5 0xffffffff81236d93 at VOP_LOCK1_APV+0x63 > #6 0xffffffff80cc3715 at _vn_lock+0x65 > #7 0xffffffff80cb1ee6 at vget+0x66 > #8 0xffffffff80ca3fcc at vfs_hash_get+0xcc > #9 0xffffffff80eefc4f at ffs_vgetf+0x3f > #10 0xffffffff80ee5a32 at softdep_sync_buf+0xb62 > #11 0xffffffff80ef5124 at ffs_syncvnode+0x234 > #12 0xffffffff80ecad66 at ffs_truncate+0x716 > #13 0xffffffff80efc909 at ufs_direnter+0x609 > #14 0xffffffff80f055dd at ufs_makeinode+0x5fd > #15 0xffffffff80f01544 at ufs_create+0x34 > #16 0xffffffff81234b30 at VOP_CREATE_APV+0x60 > #17 0xffffffff80cc301f at vn_open_cred+0x2cf That particular lock-order reversal is well-known. It's both harmless and difficult to fix, which is why nobody's fixed it yet. -Alan