Date: Fri, 1 Mar 1996 22:17:58 +0200 (SAT) From: John Hay <jhay@mikom.csir.co.za> To: freebsd-current@FreeBSD.ORG (FreeBSD-current) Subject: Re: rename panics kernel Message-ID: <199603012017.WAA17044@zibbi.mikom.csir.co.za> In-Reply-To:
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> Resently I got a "panic : vrele : negative reference count".
> The vrele() was called from rename().
>
> I tried a simple script to exercise rename (attached below) and a
> current system seems to panic (trapped in ufs_rename). There's a race
> condition lurking, it seems. I havent tried other than the sticky /tmp
> directory as the source and target files parent directory. Also the
> test was run under root's account, if it matters.
>
> Rename exercise:
> ------
> #!/bin/sh
> a=/tmp/foo.now
> b=/tmp/foo.prev
> while true
> do
> for n in 1 2 3 4 5 6 7 8 9 0
> do
> (mv $a $b ; touch $a) &
> done
> wait
> done
> ------
>
Well I tried this on a -stable machine and one with -current. Both did
panic. :-( The -current kernel is a week old. Here is its panic message:
Fatal trap 12: page fault while in kernel mode
fault virtual address = 0x68
fault code = supervisor read, page not present
instruction pointer = 0x8:0xf015ffb9
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, def32 1, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 341 (mv)
interrupt mask =
panic: page fault
f015feb4 t _ufs_chown
f015ff78 T _ufs_ioctl
f015ff84 T _ufs_select
f015ff90 T _ufs_mmap
f015ff9c T _ufs_seek
f015ffa4 T _ufs_remove
f0160028 T _ufs_link
f01602b8 T _ufs_rename
f0160cf8 T _ufs_mkdir
f0160f70 T _ufs_rmdir
f01610cc T _ufs_symlink
John
---
John Hay -- John.Hay@csir.co.za
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