lock order reversals on 10.0-ALPHA4
With: FreeBSD lapr.js.berklix.net 10.0-ALPHA4 FreeBSD 10.0-ALPHA4 #0 r255933: Sun Sep 29 02:50:54 UTC 2013 r...@snap.freebsd.org:/usr/obj/usr/src/sys/GENERIC amd64 At boot dmesg shows several lock order reversals, eg -- Trying to mount root from ufs:/dev/ad4s2a [rw]... ipfw2 (+ipv6) initialized, divert loadable, nat loadable, default to deny, logging disabled lock order reversal: 1st 0xfe00a6e26b48 bufwait (bufwait) @ /usr/src/sys/kern/vfs_bio.c:3059 2nd 0xf80005cf8400 dirhash (dirhash) @ /usr/src/sys/ufs/ufs/ufs_dirhash.c:284 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfe00c8f3d3f0 kdb_backtrace() at kdb_backtrace+0x39/frame 0xfe00c8f3d4a0 witness_checkorder() at witness_checkorder+0xd23/frame 0xfe00c8f3d530 _sx_xlock() at _sx_xlock+0x75/frame 0xfe00c8f3d570 ufsdirhash_add() at ufsdirhash_add+0x3b/frame 0xfe00c8f3d5b0 ufs_direnter() at ufs_direnter+0x688/frame 0xfe00c8f3d670 ufs_makeinode() at ufs_makeinode+0x573/frame 0xfe00c8f3d830 ufs_symlink() at ufs_symlink+0x32/frame 0xfe00c8f3d880 VOP_SYMLINK_APV() at VOP_SYMLINK_APV+0xf0/frame 0xfe00c8f3d8b0 kern_symlinkat() at kern_symlinkat+0x23e/frame 0xfe00c8f3dae0 amd64_syscall() at amd64_syscall+0x265/frame 0xfe00c8f3dbf0 Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfe00c8f3dbf0 --- syscall (57, FreeBSD ELF64, sys_symlink), rip = 0x800888ffa, rsp = 0x7fffca58, rbp = 0x7fffdc10 --- lock order reversal: 1st 0xf800881b9d50 ufs (ufs) @ /usr/src/sys/kern/vfs_mount.c:851 2nd 0xf800881b99a0 devfs (devfs) @ /usr/src/sys/kern/vfs_subr.c:2099 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfe00c8ed93d0 kdb_backtrace() at kdb_backtrace+0x39/frame 0xfe00c8ed9480 witness_checkorder() at witness_checkorder+0xd23/frame 0xfe00c8ed9510 __lockmgr_args() at __lockmgr_args+0x6f2/frame 0xfe00c8ed9640 vop_stdlock() at vop_stdlock+0x3c/frame 0xfe00c8ed9660 VOP_LOCK1_APV() at VOP_LOCK1_APV+0xf5/frame 0xfe00c8ed9690 _vn_lock() at _vn_lock+0xab/frame 0xfe00c8ed9700 vget() at vget+0x70/frame 0xfe00c8ed9750 devfs_allocv() at devfs_allocv+0xfd/frame 0xfe00c8ed97a0 devfs_root() at devfs_root+0x43/frame 0xfe00c8ed97d0 vfs_donmount() at vfs_donmount+0x115e/frame 0xfe00c8ed9aa0 sys_nmount() at sys_nmount+0x72/frame 0xfe00c8ed9ae0 amd64_syscall() at amd64_syscall+0x265/frame 0xfe00c8ed9bf0 Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfe00c8ed9bf0 --- syscall (378, FreeBSD ELF64, sys_nmount), rip = 0x800a9dd7a, rsp = 0x7fffccb8, rbp = 0x7fffd220 --- It comes up multi user OK, Do you already have enough lock order reversal to work on, or do you want me to run diagnostics ? what ? Cheers, Julian -- Julian Stacey, BSD Unix Linux C Sys Eng Consultant, Munich http://berklix.com Reply below not above, like a play script. Indent old text with . Send plain text. No quoted-printable, HTML, base64, multipart/alternative. ___ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to freebsd-current-unsubscr...@freebsd.org
Re: lock order reversals on 10.0-ALPHA4
On Sun, Oct 6, 2013 at 6:44 AM, Julian H. Stacey j...@berklix.com wrote: With: FreeBSD lapr.js.berklix.net 10.0-ALPHA4 FreeBSD 10.0-ALPHA4 #0 r255933: Sun Sep 29 02:50:54 UTC 2013 r...@snap.freebsd.org:/usr/obj/usr/src/sys/GENERIC amd64 At boot dmesg shows several lock order reversals, eg -- Trying to mount root from ufs:/dev/ad4s2a [rw]... ipfw2 (+ipv6) initialized, divert loadable, nat loadable, default to deny, logging disabled lock order reversal: 1st 0xfe00a6e26b48 bufwait (bufwait) @ /usr/src/sys/kern/vfs_bio.c:3059 2nd 0xf80005cf8400 dirhash (dirhash) @ /usr/src/sys/ufs/ufs/ufs_dirhash.c:284 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfe00c8f3d3f0 kdb_backtrace() at kdb_backtrace+0x39/frame 0xfe00c8f3d4a0 witness_checkorder() at witness_checkorder+0xd23/frame 0xfe00c8f3d530 _sx_xlock() at _sx_xlock+0x75/frame 0xfe00c8f3d570 ufsdirhash_add() at ufsdirhash_add+0x3b/frame 0xfe00c8f3d5b0 ufs_direnter() at ufs_direnter+0x688/frame 0xfe00c8f3d670 ufs_makeinode() at ufs_makeinode+0x573/frame 0xfe00c8f3d830 ufs_symlink() at ufs_symlink+0x32/frame 0xfe00c8f3d880 VOP_SYMLINK_APV() at VOP_SYMLINK_APV+0xf0/frame 0xfe00c8f3d8b0 kern_symlinkat() at kern_symlinkat+0x23e/frame 0xfe00c8f3dae0 amd64_syscall() at amd64_syscall+0x265/frame 0xfe00c8f3dbf0 Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfe00c8f3dbf0 --- syscall (57, FreeBSD ELF64, sys_symlink), rip = 0x800888ffa, rsp = 0x7fffca58, rbp = 0x7fffdc10 --- lock order reversal: 1st 0xf800881b9d50 ufs (ufs) @ /usr/src/sys/kern/vfs_mount.c:851 2nd 0xf800881b99a0 devfs (devfs) @ /usr/src/sys/kern/vfs_subr.c:2099 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfe00c8ed93d0 kdb_backtrace() at kdb_backtrace+0x39/frame 0xfe00c8ed9480 witness_checkorder() at witness_checkorder+0xd23/frame 0xfe00c8ed9510 __lockmgr_args() at __lockmgr_args+0x6f2/frame 0xfe00c8ed9640 vop_stdlock() at vop_stdlock+0x3c/frame 0xfe00c8ed9660 VOP_LOCK1_APV() at VOP_LOCK1_APV+0xf5/frame 0xfe00c8ed9690 _vn_lock() at _vn_lock+0xab/frame 0xfe00c8ed9700 vget() at vget+0x70/frame 0xfe00c8ed9750 devfs_allocv() at devfs_allocv+0xfd/frame 0xfe00c8ed97a0 devfs_root() at devfs_root+0x43/frame 0xfe00c8ed97d0 vfs_donmount() at vfs_donmount+0x115e/frame 0xfe00c8ed9aa0 sys_nmount() at sys_nmount+0x72/frame 0xfe00c8ed9ae0 amd64_syscall() at amd64_syscall+0x265/frame 0xfe00c8ed9bf0 Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfe00c8ed9bf0 --- syscall (378, FreeBSD ELF64, sys_nmount), rip = 0x800a9dd7a, rsp = 0x7fffccb8, rbp = 0x7fffd220 --- Those two LORs are well-known and at least the fist is definitely a false positive. They're rather tricky to fix; there's been previous discussion. The first one is #261 at http://sources.zabbadoz.net/freebsd/lor.html . The second one is probably #280. Cheers, matthew ___ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to freebsd-current-unsubscr...@freebsd.org
Re: lock order reversals on 10.0-ALPHA4
Those two LORs are well-known and at least the fist is definitely a false positive. They're rather tricky to fix; there's been previous discussion. The first one is #261 at http://sources.zabbadoz.net/freebsd/lor.html . The second one is probably #280. Cheers, matthew Thanks Matthew, I'll ignore them then, plenty else to do :-) Cheers, Julian -- Julian Stacey, BSD Unix Linux C Sys Eng Consultant, Munich http://berklix.com Reply below not above, like a play script. Indent old text with . Send plain text. No quoted-printable, HTML, base64, multipart/alternative. ___ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to freebsd-current-unsubscr...@freebsd.org
