Date: Mon, 9 Jan 2017 00:32:28 +0000 From: Anindya Mukherjee <anindya49@hotmail.com> To: "freebsd-current@freebsd.org" <freebsd-current@freebsd.org> Subject: New Lock Order Reversal in 12.0? Message-ID: <BN6PR22MB0802636EB33644849ED4E151B6640@BN6PR22MB0802.namprd22.prod.outlook.com>
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Hi, I'm running 12.0-current and noticed a LOR message from WITNESS which I= couldn't find a report about. I looked at http://sources.zabbadoz.net/free= bsd/lor.html, among other places. system details: root@triskelion:~ # uname -a FreeBSD triskelion 12.0-CURRENT FreeBSD 12.0-CURRENT #0 r311461: Thu Jan 5= 22:46:38 UTC 2017 root@releng3.nyi.freebsd.org:/usr/obj/usr/src/sys/GE= NERIC amd64 root@triskelion:~ # freebsd-version 12.0-CURRENT WITNESS report: lock order reversal: 1st 0xfffff8002e8049a0 ufs (ufs) @ /usr/src/sys/kern/vfs_subr.c:2598 2nd 0xfffffe01e7ce9b40 bufwait (bufwait) @ /usr/src/sys/ufs/ffs/ffs_vnops.= c:277 3rd 0xfffff8002ec7b9a0 ufs (ufs) @ /usr/src/sys/kern/vfs_subr.c:2598 stack backtrace: #0 0xffffffff80aa6fd0 at witness_debugger+0x70 #1 0xffffffff80aa6ed3 at witness_checkorder+0xde3 #2 0xffffffff80a20c15 at __lockmgr_args+0x725 #3 0xffffffff80d06fc5 at ffs_lock+0xa5 #4 0xffffffff8101c0c0 at VOP_LOCK1_APV+0xe0 #5 0xffffffff80b1a6aa at _vn_lock+0x9a #6 0xffffffff80b0ac94 at vget+0x64 #7 0xffffffff80afd19c at vfs_hash_get+0xcc #8 0xffffffff80d02e5e at ffs_vgetf+0x3e #9 0xffffffff80cf9787 at softdep_sync_buf+0xc37 #10 0xffffffff80d07c51 at ffs_syncvnode+0x2a1 #11 0xffffffff80d06e60 at ffs_fsync+0x20 #12 0xffffffff8101b110 at VOP_FSYNC_APV+0xe0 #13 0xffffffff80d0f2f0 at ufs_direnter+0x870 #14 0xffffffff80d18050 at ufs_makeinode+0x5c0 #15 0xffffffff80d13d7a at ufs_create+0x3a #16 0xffffffff810199ca at VOP_CREATE_APV+0xda #17 0xffffffff80b19f77 at vn_open_cred+0x2c7 This is based on the FreeBSD-12.0-CURRENT-amd64-20170105-r311461-memstick.i= mg installer. Known issue? It happened during a portsnap fetch. the filesystem is UFS with default mou= nt options.
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