Date: Sat, 20 Feb 2016 06:48:01 -0600 From: Larry Rosenman <ler@lerctr.org> To: Freebsd current <freebsd-current@freebsd.org> Subject: LOR: ZFS/syncer: on mount of msdosfs Message-ID: <b3b67ec2b31a8aeeb159065c8221824e@thebighonker.lerctr.org>
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Is this a known LOR: lock order reversal: 1st 0xfffff801d20ea5f0 zfs (zfs) @ /usr/src/sys/kern/vfs_mount.c:1222 2nd 0xfffff801d2fe6418 syncer (syncer) @ /usr/src/sys/kern/vfs_subr.c:2618 stack backtrace: #0 0xffffffff80a7f810 at witness_debugger+0x70 #1 0xffffffff80a7f711 at witness_checkorder+0xe71 #2 0xffffffff809fe5cb at __lockmgr_args+0xd3b #3 0xffffffff80ac525c at vop_stdlock+0x3c #4 0xffffffff80fbd640 at VOP_LOCK1_APV+0x100 #5 0xffffffff80ae5f2a at _vn_lock+0x9a #6 0xffffffff80ad6c38 at vputx+0x208 #7 0xffffffff80aceaf0 at dounmount+0x410 #8 0xffffffff80ace64d at sys_unmount+0x35d #9 0xffffffff80e6e15b at amd64_syscall+0x2db #10 0xffffffff80e4dd4b at Xfast_syscall+0xfb lock order reversal: 1st 0xfffff801d20ea5f0 zfs (zfs) @ /usr/src/sys/kern/vfs_mount.c:1222 2nd 0xfffff801d2fe65f0 devfs (devfs) @ /usr/src/sys/fs/msdosfs/msdosfs_vfsops.c:994 stack backtrace: #0 0xffffffff80a7f810 at witness_debugger+0x70 #1 0xffffffff80a7f711 at witness_checkorder+0xe71 #2 0xffffffff809fe5cb at __lockmgr_args+0xd3b #3 0xffffffff80ac525c at vop_stdlock+0x3c #4 0xffffffff80fbd640 at VOP_LOCK1_APV+0x100 #5 0xffffffff80ae5f2a at _vn_lock+0x9a #6 0xffffffff809075a3 at msdosfs_sync+0x193 #7 0xffffffff80acebc9 at dounmount+0x4e9 #8 0xffffffff80ace64d at sys_unmount+0x35d #9 0xffffffff80e6e15b at amd64_syscall+0x2db #10 0xffffffff80e4dd4b at Xfast_syscall+0xfb $ uname -a FreeBSD lrosenman-dell 11.0-CURRENT FreeBSD 11.0-CURRENT #1 r295833M: Sat Feb 20 06:13:34 CST 2016 root@lrosenman-dell:/usr/obj/usr/src/sys/GENERIC amd64 $ -- Larry Rosenman http://www.lerctr.org/~ler Phone: +1 214-642-9640 E-Mail: ler@lerctr.org US Mail: 7011 W Parmer Ln, Apt 1115, Austin, TX 78729-6961
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