From owner-freebsd-current@FreeBSD.ORG Wed Nov 12 13:36:41 2014 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 466FA694 for ; Wed, 12 Nov 2014 13:36:41 +0000 (UTC) Received: from nf.net.npkgoi.ru (nf.net.npkgoi.ru [82.179.67.95]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id D706FB8 for ; Wed, 12 Nov 2014 13:36:40 +0000 (UTC) Received: from nf.net.npkgoi.ru (localhost [127.0.0.1]) by nf.net.npkgoi.ru (8.14.1/8.14.1) with ESMTP id sACDUmWs044749 for ; Wed, 12 Nov 2014 16:30:48 +0300 (MSK) (envelope-from val@ns1.npkgoi.ru) Received: (from uucp@localhost) by nf.net.npkgoi.ru (8.14.1/8.14.1/Submit) with UUCP id sACDUm8V044748 for freebsd-current@freebsd.org; Wed, 12 Nov 2014 16:30:48 +0300 (MSK) (envelope-from val@ns1.npkgoi.ru) Received: from server.soi.spb.ru (localhost [127.0.0.1]) by server.soi.spb.ru (8.14.2/8.14.2) with ESMTP id sACDUihC094531; Wed, 12 Nov 2014 16:30:44 +0300 (MSK) (envelope-from val@ns1.npkgoi.ru) Received: (from val@localhost) by server.soi.spb.ru (8.14.2/8.14.2/Submit) id sACDUhlD094530; Wed, 12 Nov 2014 16:30:43 +0300 (MSK) (envelope-from val) Date: Wed, 12 Nov 2014 16:30:43 +0300 From: Valentin Davydov To: freebsd-current@freebsd.org Subject: New LOR's concerning zfs. Message-ID: <20141112133043.GA93891@soi.spb.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.4.2.1i X-Mailman-Approved-At: Wed, 12 Nov 2014 14:12:29 +0000 Cc: cs@soi.spb.ru X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.18-1 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, 12 Nov 2014 13:36:41 -0000 Recently I've installed current in an unusual configuration: root ZFS pool on an USB stick, without any partitioning. It works good, but quite often throws three different LORs, all related to ZFS subsystem. I suspect this is due to the irregular timing pattern of the USB access, and I couldn't find them in the list of known LORs. Hope this would help further integration of ZFS in kernel. Details please see below. Valentin Davydov. uname -a FreeBSD white.local 11.0-CURRENT FreeBSD 11.0-CURRENT #0 r274379: Tue Nov 11 14:35:45 UTC 2014 root@white.local:/usr/obj/usr/src/sys/GENERIC amd64 LORs themselves: lock order reversal: 1st 0xfffff80009382d50 syncer (syncer) @ /White/usr/src/sys/kern/vfs_subr.c:1756 2nd 0xfffff8002d9dfb78 zfs (zfs) @ /White/usr/src/sys/kern/vfs_subr.c:2144 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe00857186d0 kdb_backtrace() at kdb_backtrace+0x39/frame 0xfffffe0085718780 witness_checkorder() at witness_checkorder+0xdad/frame 0xfffffe0085718810 __lockmgr_args() at __lockmgr_args+0x9a4/frame 0xfffffe0085718940 vop_stdlock() at vop_stdlock+0x3c/frame 0xfffffe0085718960 VOP_LOCK1_APV() at VOP_LOCK1_APV+0xfc/frame 0xfffffe0085718990 _vn_lock() at _vn_lock+0xaa/frame 0xfffffe0085718a00 vget() at vget+0x67/frame 0xfffffe0085718a40 vfs_msync() at vfs_msync+0xa7/frame 0xfffffe0085718aa0 sync_fsync() at sync_fsync+0xcc/frame 0xfffffe0085718ae0 VOP_FSYNC_APV() at VOP_FSYNC_APV+0xf7/frame 0xfffffe0085718b10 sched_sync() at sched_sync+0x34b/frame 0xfffffe0085718bb0 fork_exit() at fork_exit+0x84/frame 0xfffffe0085718bf0 fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe0085718bf0 --- trap 0, rip = 0, rsp = 0xfffffe0085718cb0, rbp = 0 --- lock order reversal: 1st 0xfffff80007c9cd50 zfs (zfs) @ /White/usr/src/sys/kern/vfs_mount.c:1223 2nd 0xfffff80007c9d5f0 devfs (devfs) @ /White/usr/src/sys/kern/vfs_subr.c:2144 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe00859b63c0 kdb_backtrace() at kdb_backtrace+0x39/frame 0xfffffe00859b6470 witness_checkorder() at witness_checkorder+0xdad/frame 0xfffffe00859b6500 __lockmgr_args() at __lockmgr_args+0x9a4/frame 0xfffffe00859b6630 vop_stdlock() at vop_stdlock+0x3c/frame 0xfffffe00859b6650 VOP_LOCK1_APV() at VOP_LOCK1_APV+0xfc/frame 0xfffffe00859b6680 _vn_lock() at _vn_lock+0xaa/frame 0xfffffe00859b66f0 vget() at vget+0x67/frame 0xfffffe00859b6730 devfs_allocv() at devfs_allocv+0xfd/frame 0xfffffe00859b6780 devfs_root() at devfs_root+0x43/frame 0xfffffe00859b67b0 vflush() at vflush+0x73/frame 0xfffffe00859b6900 devfs_unmount() at devfs_unmount+0x38/frame 0xfffffe00859b6930 dounmount() at dounmount+0x424/frame 0xfffffe00859b69b0 sys_unmount() at sys_unmount+0x2ec/frame 0xfffffe00859b6ae0 amd64_syscall() at amd64_syscall+0x25a/frame 0xfffffe00859b6bf0 Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe00859b6bf0 --- syscall (22, FreeBSD ELF64, sys_unmount), rip = 0x80089213a, rsp = 0x7fffffffe468, rbp = 0x7fffffffe580 --- lock order reversal: 1st 0xfffff800102ad038 filedesc structure (filedesc structure) @ /White/usr/src/sys/kern/kern_descrip.c:1218 2nd 0xfffff8007abb35f0 zfs (zfs) @ /White/usr/src/sys/kern/vfs_subr.c:4411 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe022d790590 kdb_backtrace() at kdb_backtrace+0x39/frame 0xfffffe022d790640 witness_checkorder() at witness_checkorder+0xdad/frame 0xfffffe022d7906d0 __lockmgr_args() at __lockmgr_args+0x9a4/frame 0xfffffe022d790800 vop_stdlock() at vop_stdlock+0x3c/frame 0xfffffe022d790820 VOP_LOCK1_APV() at VOP_LOCK1_APV+0xfc/frame 0xfffffe022d790850 _vn_lock() at _vn_lock+0xaa/frame 0xfffffe022d7908c0 knlist_remove_kq() at knlist_remove_kq+0x82/frame 0xfffffe022d7908f0 filt_vfsdetach() at filt_vfsdetach+0x28/frame 0xfffffe022d790910 knote_fdclose() at knote_fdclose+0xc7/frame 0xfffffe022d790960 closefp() at closefp+0x65/frame 0xfffffe022d7909a0 amd64_syscall() at amd64_syscall+0x25a/frame 0xfffffe022d790ab0 Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe022d790ab0 --- syscall (6, FreeBSD ELF64, sys_close), rip = 0x80165c2ca, rsp = 0x7fffdfbfbef8, rbp = 0x7fffdfbfbf10 ---