Date: Mon, 22 Jan 2001 15:39:18 -0800 (PST) From: Matthew Jacob <mjacob@feral.com> To: Alfred Perlstein <bright@wintelcom.net> Cc: current@FreeBSD.ORG Subject: Re: a panic from recent changes... Message-ID: <Pine.LNX.4.21.0101221538510.9065-100000@zeppo.feral.com> In-Reply-To: <20010122153549.G26076@fw.wintelcom.net>
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> * Matthew Jacob <mjacob@feral.com> [010122 15:32] wrote:
> >
> > Debugger("panic")
> > Stopped at Debugger+0x44: pushl %ebx
> > db> t
> > Debugger(c02b8303) at Debugger+0x44
> > panic(c02c9040,bfc00000,581000,c02ea620,c030ab0c) at panic+0x70
> > kmem_malloc(c0312d20,bfc00000,8,bfbff810,c8dddd98) at kmem_malloc+0xd7
> > malloc(bfbff810,c02ea620,8,c0ff1e00,c8dddd98) at malloc+0x248
> > vfs_hang_addrlist(c0ff1e00,c0feac6c,c8dddd98,c0ff5000,c80c9f00) at
> > vfs_hang_addrlist+0x8f
> > vfs_export(c0ff1e00,c0feac6c,c8dddd98,4,c0ff1e00) at vfs_export+0x61
> > ffs_mount(c0ff1e00,809f0b0,bfbff6b8,c8ddde9c,c7add980) at ffs_mount+0x3ee
> > mount(c7add980,c8dddf80,809f0b1,0,0) at mount+0x5e7
> > syscall2(2f,2f,2f,0,0) at syscall2+0x285
> > Xint0x80_syscall() at Xint0x80_syscall+0x23
> > --- syscall 0x15, eip = 0x804f51c, esp = 0xbfbff684, ebp = 0xbfbff780 ---
> >
> > mountd exporting stuff causes a panic.
>
> This is and isn't my fault, struct ucred needs a lock for refcounts.
> Since mount uses ucreds in userspace and passes them to the kernel
> we have a issue when struct mtx changes. I'm going to take a shot
> at removing struct ucred from userland this weekend, but you can
> have a shot at it if you'd like.
>
> The other option is to at least fix mount and friends to use
> something other than ucred, and slowly remove it (struct ucred)
> from userland.
Well, no, I can live w/o exporting things from a -current box until next week.
-matt
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