Date: Sun, 25 Feb 2018 23:18:45 -0600 From: Jon Brawn <jon@brawn.org> To: FreeBSD current <freebsd-current@freebsd.org> Subject: lock order reversal Message-ID: <BE3A3E69-9C95-4F60-B3F6-1035183E4215@brawn.org>
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[-- Attachment #1 --] Wotcha! So, I’ve been using FreeBSD 12-CURRENT at various svn releases for a while now, and I get quite a few “lock order reversal” dumps. The one I’ve got on my screen at the moment is for ufs / bufwait / ufs: root@brax:/usr/src/stand # lock order reversal: 1st 0xfffffd0003ec17e8 ufs (ufs) @ /usr/src/sys/kern/vfs_subr.c:2602 2nd 0xffff0000410efa20 bufwait (bufwait) @ /usr/src/sys/ufs/ffs/ffs_vnops.c:282 3rd 0xfffffd00b83ca7e8 ufs (ufs) @ /usr/src/sys/kern/vfs_subr.c:2602 stack backtrace: #0 0xffff0000003b59d4 at witness_debugger+0x64 #1 0xffff00000032bd34 at __lockmgr_args+0x6ac #2 0xffff0000005c6af0 at ffs_lock+0x88 #3 0xffff000000679eb0 at VOP_LOCK1_APV+0xac #4 0xffff000000426fa8 at _vn_lock+0x64 #5 0xffff000000417550 at vget+0x78 #6 0xffff000000409fdc at vfs_hash_get+0xec #7 0xffff0000005c2b94 at ffs_vgetf+0x44 #8 0xffff0000005b96a8 at softdep_sync_buf+0x9f4 #9 0xffff0000005c7834 at ffs_syncvnode+0x26c #10 0xffff0000005a1b5c at ffs_truncate+0x6b0 #11 0xffff0000005ce3cc at ufs_direnter+0x778 #12 0xffff0000005d64bc at ufs_makeinode+0x4b8 #13 0xffff0000005d2b90 at ufs_create+0x38 #14 0xffff000000677168 at VOP_CREATE_APV+0xac #15 0xffff00000042691c at vn_open_cred+0x264 #16 0xffff00000041fc84 at kern_openat+0x208 #17 0xffff00000064b59c at do_el0_sync+0x8bc Is there something I should be doing to help debug these? Jon. [-- Attachment #2 --] 0 *H 01 0 + 0 *H 0%0 $ sYԛy0 *H 01 0 UGB10UGreater Manchester10USalford10U COMODO CA Limited1=0;U4COMODO RSA Client Authentication and Secure Email CA0 171028000000Z 181028235959Z0 1 0 *H jon@brawn.org0"0 *H 0 ,r #\Gi7As 1bzE_(>dzh [ jyg*?n>c!)&ۥY6 ]vVhR>1= ֞Sxݳ]ˈ*p1k5%$ŗUi a2:(M ,} wi:h:/F N5k=Q_i0 H^z8Y|eAY&. TѢJD## k! V ǶrE 00 U #0la| =+qH^ċ0 U X_`JX79"7VW0U 0 U 0 0 U %0+ +10 `HB 0FU ?0=0; +10+0)+ https://secure.comodo.net/CPS0ZU S0Q0OMKIhttp://crl.comodoca.com/COMODORSAClientAuthenticationandSecureEmailCA.crl0+0}0U+0Ihttp://crt.comodoca.com/COMODORSAClientAuthenticationandSecureEmailCA.crt0$+0http://ocsp.comodoca.com0U 0 jon@brawn.org0 *H `YWqyTټE<JHT$?/ޟ4Zj ; 2b%: !̢Oh- ^`l|Hz<]楌GTkp{}< zlvPt|@ɢo9zrC ] G/W=iDK>k` 5H^|i T ňhx?N yra2~{O8AQur00Πj8;+kٸRV0 *H 01 0 UGB10UGreater Manchester10USalford10U COMODO CA Limited1+0)U"COMODO RSA Certification Authority0 130110000000Z 280109235959Z01 0 UGB10UGreater Manchester10USalford10U COMODO CA Limited1=0;U4COMODO RSA Client Authentication and Secure Email CA0"0 *H 0 W(vu@8v!P%y L}:X>1.4vلj=4HK hyt4z|e`'"2@rF5P3*UT+%4D5+ ZSu+=7F_Zte >) 94Fro8pNhFF#Ne6/M{UWֱmAYT"o)CI m84$.zW4 r^M9,R$ <080 U #0~=<8220 U la| =+qH^ċ0U 0U 0 0U 00U 0LU E0C0A?=;http://crl.comodoca.com/COMODORSACertificationAuthority.crl0q+e0c0;+0/http://crt.comodoca.com/COMODORSAAddTrustCA.crt0$+0http://ocsp.comodoca.com0 *H x\(4O<_VΟV쏢kI/5@qB !fk&kn{hJd| q[Lǿᓬ?"@fCOݐrX urJH5;#68jle) )Y4Nezyq{: kx%iچ:w#f6HLP~jo9KXnM#:!!6 9i\}^M;TSX7 ̯3]Tc6O$voX*5!4.aKE8HIĹ7? Ar}r# R/h<סnuy<1 3mɔv#~&p vg' skMH#/ƨ$/uX qTu(|^-vM҆NKX7fA\X5sh2qP\YǟENRarpGtZp _" k7Dd JVGz10001 0 UGB10UGreater Manchester10USalford10U COMODO CA Limited1=0;U4COMODO RSA Client Authentication and Secure Email CA$ sYԛy0 + 0 *H 1 *H 0 *H 1 180226051846Z0# *H 1- [@O폄lQ´ ##0 +71001 0 UGB10UGreater Manchester10USalford10U COMODO CA Limited1=0;U4COMODO RSA Client Authentication and Secure Email CA$ sYԛy0 *H 101 0 UGB10UGreater Manchester10USalford10U COMODO CA Limited1=0;U4COMODO RSA Client Authentication and Secure Email CA$ sYԛy0 *H bTSo%y* ĄTJ]i/$P_?ݡYPPli~MX %MzgeF>ֱ 6-W8,dGhdsPf3!^*E!̉f)qE?J`VJ4>l&n{oc' qlYROADNAzB+EBa4 Ep02&ȓX, +Y%F]=2dž
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