Date: Wed, 28 Jul 1999 10:07:54 -0700 (PDT) From: kfarmer@sympatico.ca To: freebsd-gnats-submit@freebsd.org Subject: kern/12855: panic:softdep_flushfiles:looping, caused by user creating deep directory structure Message-ID: <19990728170754.B1BAF1537A@hub.freebsd.org>
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>Number: 12855
>Category: kern
>Synopsis: panic:softdep_flushfiles:looping, caused by user creating deep directory structure
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Wed Jul 28 10:10:01 PDT 1999
>Closed-Date:
>Last-Modified:
>Originator: Kelvin Farmer
>Release: 4.0-current (as of july 26, 1999)
>Organization:
>Environment:
FreeBSD tristal.sympatico.ca 4.0-CURRENT FreeBSD 4.0-CURRENT #5: Wed Jul 28 12:29:57 EDT 1999 root@tristal.sympatico.ca:/usr/src/sys/compile/TRISTAL i386
>Description:
if a user creates a very deep directory structure (eg, /usr/home/guest/tmp/tmp/tmp/tmp/tmp/....)
Then umounting the filesystem causes: panic:softdep_flushfiles:looping.
also: rm -rf cannot remove the directory structure, claims 'directory not empty'
>How-To-Repeat:
1) create a directory structure at least 256(?) directories deep.
2) umount the filesystem.
fsck is able to fix this on reboot.
rm -r is able to remove the structure if you go far enough into it.
from ffs_softdep.c: line 675
softdep_worklist_busy = 0;
/*
* If we are unmounting then it is an error to fail. If we
* are simply trying to downgrade to read-only, then filesystem
* activity can keep us busy forever, so we just fail with EBUSY.
*/
if (loopcnt == 0) {
if (oldmnt->mnt_kern_flag & MNTK_UNMOUNT)
panic("softdep_flushfiles: looping");
error = EBUSY;
}
return (error);
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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