Date: Mon, 23 Apr 2001 15:10:07 -0700 (PDT) From: John Baldwin <jhb@FreeBSD.org> To: Jens Schweikhardt <schweikh@schweikhardt.net> Cc: freebsd-current@FreeBSD.org Subject: RE: duplicate locks and lock order reversal Message-ID: <XFMail.010423151007.jhb@FreeBSD.org> In-Reply-To: <20010423225230.A974@schweikhardt.net>
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On 23-Apr-01 Jens Schweikhardt wrote: > hello, world\n > > my current kernel cvsupped around Apr 14th tells me about > duplicate locks and lock order reversal. Is this reason to worry? > ... > Apr 23 22:23:09 hal9000 /boot/kernel/kernel: da0 at ahc0 bus 0 target 2 lun 0 > Apr 23 22:23:10 hal9000 /boot/kernel/kernel: da0: <IBM DCAS-34330 S65A> Fixed > Direct Access SCSI-2 device > Apr 23 22:23:10 hal9000 /boot/kernel/kernel: da0: 20.000MB/s transfers > (20.000MHz, offset 15) > Apr 23 22:23:10 hal9000 /boot/kernel/kernel: da0: 4134MB (8467200 512 byte > sectors: 255H 63S/T 527C) > Apr 23 22:23:10 hal9000 /boot/kernel/kernel: acquring duplicate lock of same > type: "allproc" > Apr 23 22:23:10 hal9000 /boot/kernel/kernel: 1st @ > /usr/src/sys/kern/kern_proc.c:584 > Apr 23 22:23:10 hal9000 /boot/kernel/kernel: 2nd @ > /usr/src/sys/kern/kern_proc.c:143 > Apr 23 22:23:10 hal9000 /boot/kernel/kernel: lock order reversal > Apr 23 22:23:10 hal9000 /boot/kernel/kernel: 1st vnode interlock last > acquired @ /usr/src/sys/kern/vfs_vnops.c:625 > Apr 23 22:23:10 hal9000 /boot/kernel/kernel: 2nd 0xc03c0120 mntvnode @ > /usr/src/sys/ufs/ffs/ffs_vfsops.c:967 > Apr 23 22:23:10 hal9000 /boot/kernel/kernel: 3rd 0xc8f68eac vnode interlock @ > /usr/src/sys/ufs/ffs/ffs_vfsops.c:976 > Apr 23 22:23:10 hal9000 lpd[315]: lpd startup: logging=0 > Apr 23 22:24:08 hal9000 /boot/kernel/kernel: cd0 at ahc0 bus 0 target 3 lun 0 > Apr 23 22:24:08 hal9000 /boot/kernel/kernel: cd0: <YAMAHA CRW6416S 1.0b> > Removable CD-ROM SCSI-2 device > Apr 23 22:24:08 hal9000 /boot/kernel/kernel: cd0: 10.000MB/s transfers > (10.000MHz, offset 15) > Apr 23 22:24:08 hal9000 /boot/kernel/kernel: cd0: Attempt to query device > size failed: NOT READY, Medium not present - tray closed > Apr 23 22:26:44 hal9000 /boot/kernel/kernel: i4b: unit 0, assigned TEI = 126 > = 0x7e > Apr 23 22:27:08 hal9000 /boot/kernel/kernel: [agree] This is a FAQ. Please keep up with -current if you are tracking it. These are known and not a problem right now. The VFS reversals have been around for a long time unfortunately, and the allproc warning is due to witness still needing some work to better handle recursing on sx locks. -- John Baldwin <jhb@FreeBSD.org> -- http://www.FreeBSD.org/~jhb/ PGP Key: http://www.baldwin.cx/~john/pgpkey.asc "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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