Date: Sat, 26 Mar 2005 23:09:21 +0000 (GMT) From: Robert Watson <rwatson@FreeBSD.org> To: current@FreeBSD.org Subject: Re: panic: Duplicate free of item 0xc5862800 from zone 0xc55f8580(NAMEI) Message-ID: <Pine.NEB.3.96L.1050326230822.28455C-100000@fledge.watson.org> In-Reply-To: <Pine.NEB.3.96L.1050326200512.28455A-100000@fledge.watson.org>
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On Sat, 26 Mar 2005, Robert Watson wrote: > Got the following panic while doing a buildworld on a dual xeon (quad > logical processor) system today, using 6-CURRENT source from today. Actually, it looks like this is a false positive -- a race introduced in local code because the debugging code to check for multiple frees (etc) was getting called after mutexes/etc were released, so raced against real-world re-allocation. Robert N M Watson > > Robert N M Watson > > Slab at 0xc5857200, freei 2 = 0. > panic: Duplicate free of item 0xc5862800 from zone 0xc55f8580(NAMEI) > > cpuid = 1 > KDB: enter: panic > [thread pid 10534 tid 100207 ] > Stopped at kdb_enter+0x2b: nop > db> trace > Tracing pid 10534 tid 100207 td 0xc5e27000 > kdb_enter(c08317e5) at kdb_enter+0x2b > panic(c084b549,c5862800,c55f8580,c0839cfb,c084b52d) at panic+0x127 > uma_dbg_free(c55f8580,0,c5862800) at uma_dbg_free+0x110 > uma_zfree_arg(c55f8580,c5862800,0) at uma_zfree_arg+0xf4 > namei(ebb3fbdc,c0626abe,c5e27000,c5e27000,c5e27000) at namei+0x245 > vn_open_cred(ebb3fbdc,ebb3fcdc,1a4,c5ddec80,3) at vn_open_cred+0x278 > vn_open(ebb3fbdc,ebb3fcdc,1a4,3,c0626abe) at vn_open+0x1e > kern_open(c5e27000,8418900,0,8001,1b6) at kern_open+0xb6 > open(c5e27000,ebb3fd14,3,b,202) at open+0x1a > syscall(2f,2f,bfbf002f,0,0) at syscall+0x213 > Xint0x80_syscall() at Xint0x80_syscall+0x1f > --- syscall (5, FreeBSD ELF32, open), eip = 0x82d0e27, esp = 0xbfbfe2fc, > ebp = 0xbfbfe318 --- > db> show lockedvnods > Locked vnodes > > 0xc61819fc: tag ufs, type VREG > usecount 1, writecount 0, refcount 4 mountedhere 0 > flags () > v_object 0xc6174738 ref 0 pages 5 > lock type ufs: EXCL (count 1) by thread 0xc5e27a10 (pid 10541) > ino 2028972, on dev ar0s1e > > 0xc6b5fd50: tag ufs, type VREG > usecount 1, writecount 0, refcount 3 mountedhere 0 > flags () > v_object 0xc76d3528 ref 0 pages 1 > lock type ufs: EXCL (count 1) by thread 0xc624aa10 (pid 10538) > ino 2028317, on dev ar0s1e > > > _______________________________________________ > freebsd-current@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org" >
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