Date: Thu, 18 Jun 2009 13:55:35 +0300 From: Andriy Gapon <avg@icyb.net.ua> To: Thomas Backman <serenity@exscape.org> Cc: Wesley Shields <wxs@FreeBSD.org>, freebsd-current@FreeBSD.org Subject: Re: DTrace panic while probing syscall::open (and possibly many others) Message-ID: <4A3A1D27.4010802@icyb.net.ua> In-Reply-To: <B2F32C8F-810B-4EA5-9E34-39ADD5E5CED4@exscape.org> References: <949B5884-5303-4EFF-AC7D-293640FFA012@exscape.org> <0C235698-3ED2-4AE9-A7D1-5DC56D8324A4@exscape.org> <200905212129.47892.mel.flynn%2Bfbsd.current@mailing.thruhere.net> <44F486FA-E798-448D-BE31-F7A51EF1F612@exscape.org> <60173AF0-7E54-4BDD-8927-0DADA9DAD1B4@exscape.org> <20090522200306.GE2630@atarininja.org> <20090617225849.GB28509@atarininja.org> <B2F32C8F-810B-4EA5-9E34-39ADD5E5CED4@exscape.org>
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on 18/06/2009 12:43 Thomas Backman said the following: > #10 0xffffffff816c9140 in vpanic_common () from /boot/kernel/dtrace.ko > #11 0xffffffff816b3067 in dtrace_panic (format=Variable "format" is not > available. > ) > at > /usr/src/sys/modules/dtrace/dtrace/../../../cddl/contrib/opensolaris/uts/common/dtrace/dtrace.c:600 > > #12 0xffffffff816b309d in dtrace_assfail ( > a=0xffffffff816d4b88 "kaddr >= kernelbase && kaddr + size >= kaddr", > f=0xffffff803e770370 > "ÀàF\201ÿÿÿÿÀàF\201ÿÿÿÿ0\005w>\200ÿÿÿÇà\206\200ÿÿÿÿWD\210\200ÿÿÿÿ`&t~", > l=Variable "l" is not available. > ) > at > /usr/src/sys/modules/dtrace/dtrace/../../../cddl/contrib/opensolaris/uts/common/dtrace/dtrace.c:607 > > #13 0xffffffff816b3140 in dtrace_copycheck (uaddr=34365163021, > kaddr=Variable "kaddr" is not available. > ) > at dtrace_isa.c:527 > #14 0xffffffff816b31fc in dtrace_copyinstr (uaddr=34365163021, > kaddr=18446743524025463312, size=256, flags=0xffffffff8146e0c0) > at dtrace_isa.c:558 kaddr=18446743524025463312 == FFFFFF8004467210 I think kernelbase on amd64 is 0xFFFFFFFF80000000. FFFFFF8004467210 kaddr is smaller than FFFFFFFF80000000 kernelbase The numbers do look suspiciously similar, so I am not sure if you are seeing a race or a real bug somewhere. > #15 0xffffffff816c10f1 in dtrace_dif_emulate (difo=0xffffffff80884457, > mstate=0xffffff803e770a10, vstate=0xffffff0002930c38, > state=0xffffff0002930c00) > at > /usr/src/sys/modules/dtrace/dtrace/../../../cddl/contrib/opensolaris/uts/common/dtrace/dtrace.c:3452 > > #16 0xffffffff816c233a in dtrace_probe (id=Variable "id" is not available. > ) > at > /usr/src/sys/modules/dtrace/dtrace/../../../cddl/contrib/opensolaris/uts/common/dtrace/dtrace.c:6226 > > #17 0xffffffff817f2145 in systrace_probe () from /boot/kernel/systrace.ko > #18 0xffffffff80887c7d in syscall (frame=0xffffff803e770c90) > at /usr/src/sys/amd64/amd64/trap.c:997 > #19 0xffffffff8086e350 in Xfast_syscall () > at /usr/src/sys/amd64/amd64/exception.S:364 > #20 0x000000080050c3ac in ?? () -- Andriy Gapon
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