kern/84107: unionfs related panic

Danny Braniss danny at cs.huji.ac.il
Tue Jul 26 06:30:20 GMT 2005


>Number:         84107
>Category:       kern
>Synopsis:       unionfs related panic
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Jul 26 06:30:16 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator:     Danny Braniss
>Release:        FreeBSD 6.0-BETA1 i386
>Organization:
>Environment:
System: FreeBSD shuttle-2 6.0-BETA1 FreeBSD 6.0-BETA1 #2: Fri Jul 22 12:41:55 IDT 2005 danny at x-dev:/r+d/obj/x-dev/r+d/6.0/src/sys/HUJI i386


	
>Description:
	executing a mv (rename) in a union fs causes:
panic: lockmgr: locking against myself
cpuid = 0
KDB: enter: panic
[thread pid 3818 tid 100096 ]
Stopped at      kdb_enter+0x2b: nop     
db> tr
Tracing pid 3818 tid 100096 td 0xc1db1180
kdb_enter(c086b4bf) at kdb_enter+0x2b
panic(c086a0cf,c1db1180,0,c08cd020,d6b46ad8) at panic+0x127
lockmgr(c1e02498,3002,c1e024bc,c1db1180,d6b46ab4) at lockmgr+0x3a6
vop_stdlock(d6b46ad8,1002,c1e02440,d6b46af4,c069f920) at vop_stdlock+0x1e
VOP_LOCK_APV(c1d9d240,d6b46ad8) at VOP_LOCK_APV+0x43
vn_lock(c1e02440,1002,c1db1180) at vn_lock+0xf4
lookup(d6b46c18,c1e73000,1,c1db1180,d6b46c40) at lookup+0xc9
namei(d6b46c18,1,0,c10493dc,c1040878) at namei+0x396
kern_rename(c1db1180,bfbfea37,bfbfea43,0,d6b46d30) at kern_rename+0xf4
rename(c1db1180,d6b46d04,2,1,292) at rename+0x15
syscall(3b,3b,3b,bfbfe938,bfbfea37) at syscall+0x2bb
Xint0x80_syscall() at Xint0x80_syscall+0x1f
--- syscall (128, FreeBSD ELF32, rename), eip = 0x280b6f27, esp = 0xbfbfdd8c, ebp = 0xbfbfe408 ---

>How-To-Repeat:
    kldload unionfs
    /sbin/mdmfs -i 4096 -s 4096 -M md /conf/etc
    chmod 755 /conf/etc
    mount_unionfs /conf/etc /etc
    ls -R /etc > /dev/null

    mv /etc/somefile /etc/smfl

>Fix:

	


>Release-Note:
>Audit-Trail:
>Unformatted:


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