Date: Wed, 25 Sep 2002 16:49:12 -0400 (EDT) From: Jeff Roberson <jroberson@chesapeake.net> To: David Wolfskill <david@catwhisker.org> Cc: current@freebsd.org Subject: Re: Panic in VFS subsystem with very recent CURRENT Message-ID: <20020925164705.X97589-100000@mail.chesapeake.net> In-Reply-To: <200209251754.g8PHs2Cd069940@bunrab.catwhisker.org>
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On Wed, 25 Sep 2002, David Wolfskill wrote:
> panic: vrele: missed vn_close
> cpuid = 0; lapic.id = 00000000
> Debugger("panic")
> Stopped at Debugger+0x55: xchgl %ebx,in_Debugger.0
> db> tr
> Debugger(c036903a,0,c0372831,d7b9cb70,1) at Debugger+0x55
> panic(c0372831,0,c03724c2,810,c4439200) at panic+0x11f
> vrele(c44545c8,c039a9c0,c44545c8,3,c4456400) at vrele+0x19b
> vn_close(c44545c8,3,c4456400,c4078900,d7b9cc44) at vn_close+0x5d
> vn_closefile(c4209078,c4078900,c03657a0,72a,0) at vn_closefile+0x30
> fdrop_locked(c4209078,c4078900,c03657a0,668,c4078900) at fdrop_locked+0x17c
> fdrop(c4209078,c4078900,c03ef8c0,c03f1838,246) at fdrop+0x3e
> closef(c4209078,c4078900,c03657a0,342,c4209078) at closef+0xac
> close(c4078900,d7b9cd10,c03915a9,418,1) at close+0x158
> syscall(bfbf002f,2f,bfbf002f,bfbfedcd,bfbfedfd) at syscall+0x2ee
> Xint0x80_syscall() at Xint0x80_syscall+0x1d
> --- syscall (6, FreeBSD ELF32, close), eip = 0x280f7a9b, esp = 0xbfbfed9c, ebp = 0xbfbfef38 ---
Also from david, vprint output:
0xc44545c8: tag devfs, type VCHR, usecount 1, writecount 1, refcount 0,
What's interesting here is that we're about to drop our reference but we
have not decremented the writecount. I'm sure it's a simple logic error
somewhere. I'll have to wait until tonight to look for it. If anyone
finds it in the mean time they are welcome to commit a fix.
Thanks,
Jeff
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