From mboxrd@z Thu Jan 1 00:00:00 1970 From: George Dunlap Subject: Re: So I tried to use xentrace... Date: Fri, 7 May 2010 15:48:15 -0500 Message-ID: References: <4BDB4CCC.3080405@goop.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: <4BDB4CCC.3080405@goop.org> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Jeremy Fitzhardinge Cc: Xen-devel , Keir Fraser List-Id: xen-devel@lists.xenproject.org Hmm, -S 256 is an obsolete size; it should be something more like -S 32. However, I added a patch that was supposed to do appropriate bounds-checking and return an error if the number was too high. Looks like it's not working properly for some reason... I'll take a look. -George On Fri, Apr 30, 2010 at 4:34 PM, Jeremy Fitzhardinge wrot= e: > When I ran "xentrace -D -S 256 -e all /tmp/test.trace" from the > xenanalyze documentation, Xen immediately crashed with: > > (XEN) tbuf_size 256 > (XEN) p0 mfn 106a00 offset 64 > (XEN) p1 mfn 115700 offset 320 > (XEN) p2 mfn 113f00 offset 576 > (XEN) p3 mfn 113e00 offset 832 > (XEN) Xen trace buffers: initialized > (XEN) ----[ Xen-4.1-unstable =A0x86_64 =A0debug=3Dy =A0Not tainted ]---- > (XEN) CPU: =A0 =A01 > (XEN) RIP: =A0 =A0e008:[] check_lock+0x1b/0x45 > (XEN) RFLAGS: 0000000000010246 =A0 CONTEXT: hypervisor > (XEN) rax: 0000000000000001 =A0 rbx: 0000000000000028 =A0 rcx: 0000000000= 000000 > (XEN) rdx: 0000000000000000 =A0 rsi: 00000000c3fc8050 =A0 rdi: 0000000000= 00002c > (XEN) rbp: ffff83013ff2fc60 =A0 rsp: ffff83013ff2fc60 =A0 r8: =A0ffff8300= bf78a000 > (XEN) r9: =A0ffff83013ff60000 =A0 r10: 0080000000000001 =A0 r11: ffff82f6= 0164b930 > (XEN) r12: 00000000c3fc8050 =A0 r13: 00000000c3fc8050 =A0 r14: 0000000000= 000028 > (XEN) r15: 0000000000800627 =A0 cr0: 000000008005003b =A0 cr4: 0000000000= 0026f0 > (XEN) cr3: 00000000b2fa0000 =A0 cr2: 000000000000002c > (XEN) ds: 0000 =A0 es: 0000 =A0 fs: 0000 =A0 gs: 0000 =A0 ss: e010 =A0 cs= : e008 > (XEN) Xen stack trace from rsp=3Dffff83013ff2fc60: > (XEN) =A0 =A0ffff83013ff2fc78 ffff82c480121993 0000000000000000 ffff83013= ff2fca8 > (XEN) =A0 =A0ffff82c480117fe0 ffff83013fee0000 80000c3fc8050627 00000000c= 3fc8050 > (XEN) =A0 =A0ffff83013ff60000 ffff83013ff2fd28 ffff82c48016538c ffff8800a= ec97b08 > (XEN) =A0 =A0ffff83013ff2fcf0 00000000000b25c9 0000000000000100 ffff8300b= f78a000 > (XEN) =A0 =A00000000000000206 0000000000000000 ffff830e7f900a00 ffff83013= ff2fd28 > (XEN) =A0 =A0ffff8300b25c9228 ffff8300bf78a000 0000000000800627 000000000= 0000000 > (XEN) =A0 =A00000000000000000 ffff83013ff2fdb8 ffff82c48016a9f7 ffff83013= fee0018 > (XEN) =A0 =A000007ff03ff2ff28 0000000000000000 00000000000b25c9 ffff83013= fee0000 > (XEN) =A0 =A080000c3fc8050627 80000c3fc8050627 ffff83013ff60000 ffff83013= ff2fdb8 > (XEN) =A0 =A00000000180162c10 ffff83013ff2fdd8 0000000000000000 000000000= 0000000 > (XEN) =A0 =A0ffff8800aec97bb8 ffff83013ff2ff28 ffff83013ff2ff28 ffff83013= ff2ff08 > (XEN) =A0 =A0ffff82c48016b2a9 0000000000000000 0000000000000000 000000000= 0000000 > (XEN) =A0 =A000000000bf78a000 0000000000000006 00000000b2e55067 ffff83013= ff2ff28 > (XEN) =A0 =A0ffff83013ff2ff28 ffff83013ff2ff28 ffff83013ff2ff28 ffff83013= ff2ff28 > (XEN) =A0 =A0ffff83013ff2ff28 ffff83013ff2ff28 ffff83013ff2ff28 000000000= 0000000 > (XEN) =A0 =A000007ff200000082 ffff83013ff2fe68 80000c3fc8050627 ffff8300b= f78a000 > (XEN) =A0 =A0ffff8300b25c9228 ffff83013ff2fee8 ffff82f60164b920 ffff83013= fee0000 > (XEN) =A0 =A0000000000003e6b8 00000000000b25c9 00000001032cc060 ffff83013= ff60000 > (XEN) =A0 =A00000000000000000 aaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaa 00000001a= aaaaaaa > (XEN) =A0 =A00000000000000001 00000000b25c9228 80000c3fc8050627 ffff8800a= ec97bb8 > (XEN) Xen call trace: > (XEN) =A0 =A0[] check_lock+0x1b/0x45 > (XEN) =A0 =A0[] _spin_lock+0x11/0x3f > (XEN) =A0 =A0[] rangeset_contains_range+0x44/0x82 > (XEN) =A0 =A0[] get_page_from_l1e+0x24c/0x47f > (XEN) =A0 =A0[] mod_l1_entry+0x47f/0x64e > (XEN) =A0 =A0[] do_mmu_update+0x6e3/0x1962 > (XEN) =A0 =A0[] syscall_enter+0xef/0x149 > (XEN) > (XEN) Pagetable walk from 000000000000002c: > (XEN) =A0L4[0x000] =3D 00000000b2c3a067 00000000000aecc5 > (XEN) =A0L3[0x000] =3D 00000000b2c70067 00000000000aec8f > (XEN) =A0L2[0x000] =3D 0000000000000000 ffffffffffffffff > (XEN) > (XEN) **************************************** > (XEN) Panic on CPU 1: > (XEN) FATAL PAGE FAULT > (XEN) [error_code=3D0000] > (XEN) Faulting linear address: 000000000000002c > (XEN) **************************************** > (XEN) > (XEN) Reboot in five seconds... > > =A0 =A0 =A0 =A0J > > > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xensource.com > http://lists.xensource.com/xen-devel >