FreeBSD 7.1-PRERELEASE-p1, panic: dqget: free dquot isn't

[Kostik Belousov]

On Wed, Dec 03, 2008 at 08:12:22PM +0100, Frode Nordahl wrote:
> (moved to freebsd-stable)
> 
> On 3. des.. 2008, at 18.39, Kostik Belousov wrote:
> 
> >>db> where
> >>Tracing pid 41111 tid 100199 td 0xffffff0056f1f370
> >>kdb_enter_why() at kdb_enter_why+0x3d
> >>panic() at panic+0x17b
> >>dqget() at dqget+0xaa4
> >>getinoquota() at getinoquota+0x5b
> >>ufs_access() at ufs_access+0x28c
> >>ufs_lookup() at ufs_lookup+0x9fe
> >>vfs_cache_lookup() at vfs_cache_lookup+0xf8
> >>VOP_LOOKUP_APV() at VOP_LOOKUP_APV+0x40
> >>lookup() at lookup+0x531
> >>namei() at namei+0x35d
> >>kern_rmdir() at kern_rmdir+0xbd
> >>syscall() at syscall+0x256
> >>Xfast_syscall() at Xfast_syscall+0xab
> >
> >For the start, I want to see the content of the *dq in the dqget()
> >frame.
> 
> 
> I am unable to get to *dq :-(
> 
> (kgdb) frame 10
> #10 0xffffffff806dbc54 in dqget (vp=0xffffff011e0767e0, id=419444,
>     ump=0xffffff00038a9000, type=0, dqp=0xffffff0122e47268)
>     at /usr/src/sys/ufs/ufs/ufs_quota.c:1210
> 1210				panic("dqget: free dquot isn't");
If this is repeatable, change panic to
	panic("dqget: free dquot isn't %p", dq);

and then in kgdb p/x *(struct dquot *)<printed value>
> (kgdb) print dq
> Variable "dq" is not available.
> 
> I will try to provoke the panic again and see if I can get more info  
> from DDB. (Any hints as to what to ask ddb to get the information you  
> requested?)
> 
> (I'll put my kernel.debug and vmcore.0 in an archve somewhere and mail  
> you the URL privately if you are up to download 126MB)
> 
> --
> Frode Nordahl
> 
> 
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