Date: Fri, 2 May 1997 19:32:42 +0400 (MSD) From: Dmitrij Tejblum <dima@tejblum.dnttm.rssi.ru> To: FreeBSD-gnats-submit@FreeBSD.ORG Subject: kern/3469: After unmounting DEVFS, mounting DEVFS cause panic: page fault Message-ID: <199705021532.TAA00524@tejblum.dnttm.rssi.ru> Resent-Message-ID: <199705021540.IAA06697@hub.freebsd.org>
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>Number: 3469 >Category: kern >Synopsis: After unmounting DEVFS, mounting DEVFS cause panic: page fault >Confidential: no >Severity: serious >Priority: medium >Responsible: freebsd-bugs >State: open >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Fri May 2 08:40:01 PDT 1997 >Last-Modified: >Originator: Dmitrij Tejblum >Organization: >Release: FreeBSD 3.0-CURRENT i386 >Environment: FreeBSD tejblum.dnttm.rssi.ru 3.0-CURRENT FreeBSD 3.0-CURRENT #6: Fri May 2 17:58:13 MSD 1997 dima@tejblum.dnttm.rssi.ru:/usr/src/sys/compile/DIMA i386 devfs /devs devfs rw 0 0 in /etc/fstab >Description: After 'umount /devs', any attempt to mount DEVFS cause 'panic: page fault'. It is due to missing cleanup in devfs_dn_free(). >How-To-Repeat: First, apply patch from kern/3276, or you will repeat kern/3276 :-) umount /devs mount /devs >Fix: *** /usr/src/sys/miscfs/devfs/devfs_tree.c.00 Fri Apr 11 22:56:28 1997 --- /usr/src/sys/miscfs/devfs/devfs_tree.c Fri May 2 17:57:04 1997 *************** *** 496,501 **** --- 496,507 ---- if(--dnp->links <= 0 ) /* can be -1 for initial free, on error */ { /*probably need to do other cleanups XXX */ + if (dnp->nextsibling != dnp) { + dn_p* prevp = dnp->prevsiblingp; + *prevp = dnp->nextsibling; + dnp->nextsibling->prevsiblingp = prevp; + + } if(dnp->type == DEV_SLNK) { free(dnp->by.Slnk.name,M_DEVFSNODE); } >Audit-Trail: >Unformatted:
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