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Date: Sat, 20 Aug 2011 21:16:39 +0800 From: Brad Campbell <lists2009@...rfbargle.com> To: Eric Dumazet <eric.dumazet@...il.com> CC: Avi Kivity <avi@...hat.com>, CaT <cat@....com.au>, Borislav Petkov <bp@...en8.de>, linux-kernel@...r.kernel.org, kvm@...r.kernel.org, netdev <netdev@...r.kernel.org> Subject: Re: KVM induced panic on 2.6.38[2367] & 2.6.39 On 07/06/11 21:37, Eric Dumazet wrote: > Le mardi 07 juin 2011 à 21:27 +0800, Brad Campbell a écrit : >> On 07/06/11 04:22, Eric Dumazet wrote: >> >>> Could you please try latest linux-2.6 tree ? >>> >>> We fixed many networking bugs that could explain your crash. >>> >>> >>> >>> >> >> No good I'm afraid. >> >> [ 543.040056] >> ============================================================================= >> [ 543.040136] BUG ip_dst_cache: Padding overwritten. >> 0xffff8803e4217ffe-0xffff8803e4217fff >> [ 543.040194] > > Thats pretty strange : These are the last two bytes of a page, set to > 0x0000 (a 16 bit value) > > There is no way a dst field could actually sit on this location (its a > padding), since a dst is a bit less than 256 bytes (0xe8), and each > entry is aligned on a 64byte address. > > grep dst /proc/slabinfo > > ip_dst_cache 32823 62944 256 32 2 : tunables 0 0 > 0 : slabdata 1967 1967 0 > > sizeof(struct rtable)=0xe8 > > >> ----------------------------------------------------------------------------- >> [ 543.040198] >> [ 543.040298] INFO: Slab 0xffffea000d9e74d0 objects=25 used=25 fp=0x >> (null) flags=0x8000000000004081 >> [ 543.040364] Pid: 4576, comm: kworker/1:2 Not tainted 3.0.0-rc2 #1 >> [ 543.040415] Call Trace: >> [ 543.040472] [<ffffffff810b9c1d>] ? slab_err+0xad/0xd0 >> [ 543.040528] [<ffffffff8102e034>] ? check_preempt_wakeup+0xa4/0x160 >> [ 543.040595] [<ffffffff810ba206>] ? slab_pad_check+0x126/0x170 >> [ 543.040650] [<ffffffff8133045b>] ? dst_destroy+0x8b/0x110 >> [ 543.040701] [<ffffffff810ba29a>] ? check_slab+0x4a/0xc0 >> [ 543.040753] [<ffffffff810baf2d>] ? free_debug_processing+0x2d/0x250 >> [ 543.040808] [<ffffffff810bb27b>] ? __slab_free+0x12b/0x140 >> [ 543.040862] [<ffffffff810bbe99>] ? kmem_cache_free+0x99/0xa0 >> [ 543.040915] [<ffffffff8133045b>] ? dst_destroy+0x8b/0x110 >> [ 543.040967] [<ffffffff813307f6>] ? dst_gc_task+0x196/0x1f0 >> [ 543.041021] [<ffffffff8104e954>] ? queue_delayed_work_on+0x154/0x160 >> [ 543.041081] [<ffffffff813066fe>] ? do_dbs_timer+0x20e/0x3d0 >> [ 543.041133] [<ffffffff81330660>] ? dst_alloc+0x180/0x180 >> [ 543.041187] [<ffffffff8104f28b>] ? process_one_work+0xfb/0x3b0 >> [ 543.041242] [<ffffffff8104f964>] ? worker_thread+0x144/0x3d0 >> [ 543.041296] [<ffffffff8102cc10>] ? __wake_up_common+0x50/0x80 >> [ 543.041678] [<ffffffff8104f820>] ? rescuer_thread+0x2e0/0x2e0 >> [ 543.041729] [<ffffffff8104f820>] ? rescuer_thread+0x2e0/0x2e0 >> [ 543.041782] [<ffffffff81053436>] ? kthread+0x96/0xa0 >> [ 543.041835] [<ffffffff813e1d14>] ? kernel_thread_helper+0x4/0x10 >> [ 543.041890] [<ffffffff810533a0>] ? kthread_worker_fn+0x120/0x120 >> [ 543.041944] [<ffffffff813e1d10>] ? gs_change+0xb/0xb >> [ 543.041993] Padding 0xffff8803e4217f40: 5a 5a 5a 5a 5a 5a 5a 5a 5a >> 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZZZZZ >> [ 543.042718] Padding 0xffff8803e4217f50: 5a 5a 5a 5a 5a 5a 5a 5a 5a >> 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZZZZZ >> [ 543.043433] Padding 0xffff8803e4217f60: 5a 5a 5a 5a 5a 5a 5a 5a 5a >> 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZZZZZ >> [ 543.044155] Padding 0xffff8803e4217f70: 5a 5a 5a 5a 5a 5a 5a 5a 5a >> 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZZZZZ >> [ 543.044866] Padding 0xffff8803e4217f80: 5a 5a 5a 5a 5a 5a 5a 5a 5a >> 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZZZZZ >> [ 543.045590] Padding 0xffff8803e4217f90: 5a 5a 5a 5a 5a 5a 5a 5a 5a >> 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZZZZZ >> [ 543.046311] Padding 0xffff8803e4217fa0: 5a 5a 5a 5a 5a 5a 5a 5a 5a >> 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZZZZZ >> [ 543.047034] Padding 0xffff8803e4217fb0: 5a 5a 5a 5a 5a 5a 5a 5a 5a >> 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZZZZZ >> [ 543.047755] Padding 0xffff8803e4217fc0: 5a 5a 5a 5a 5a 5a 5a 5a 5a >> 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZZZZZ >> [ 543.048474] Padding 0xffff8803e4217fd0: 5a 5a 5a 5a 5a 5a 5a 5a 5a >> 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZZZZZ >> [ 543.049203] Padding 0xffff8803e4217fe0: 5a 5a 5a 5a 5a 5a 5a 5a 5a >> 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZZZZZ >> [ 543.049909] Padding 0xffff8803e4217ff0: 5a 5a 5a 5a 5a 5a 5a 5a 5a >> 5a 5a 5a 5a 5a 00 00 ZZZZZZZZZZZZZZ.. >> [ 543.050021] FIX ip_dst_cache: Restoring >> 0xffff8803e4217f40-0xffff8803e4217fff=0x5a >> [ 543.050021] >> >> Dropped -mm, Hugh and Andrea from CC as this does not appear to be mm or >> ksm related. >> >> I'll pare down the firewall and see if I can make it break easier with a >> smaller test set. > > Hmm, not sure now :( > > Could you reproduce another bug please ? I know this is an old one, but I recently purchased a second system to allow me to test and bisect this off-line (the live system is too much of a headache to bisect on). brad@...t:/raid10/src/linux-2.6$ git bisect log git bisect start # good: [9fe6206f400646a2322096b56c59891d530e8d51] Linux 2.6.35 git bisect good 9fe6206f400646a2322096b56c59891d530e8d51 # bad: [da5cabf80e2433131bf0ed8993abc0f7ea618c73] Linux 2.6.36-rc1 git bisect bad da5cabf80e2433131bf0ed8993abc0f7ea618c73 # bad: [0f477dd0851bdcee82923da66a7fc4a44cb1bc3d] Merge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip git bisect bad 0f477dd0851bdcee82923da66a7fc4a44cb1bc3d # bad: [3ff1c25927e3af61c6bf0e4ed959504058ae4565] phy/marvell: add 88ec048 support git bisect bad 3ff1c25927e3af61c6bf0e4ed959504058ae4565 # good: [05318bc905467237d4aa68a701f6e92a2b332218] Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next-2.6 git bisect good 05318bc905467237d4aa68a701f6e92a2b332218 # bad: [2ba13ed678775195e8255b4e503c59d48b615bd8] Bluetooth: Remove check for supported mode git bisect bad 2ba13ed678775195e8255b4e503c59d48b615bd8 # bad: [1e2cfeef060fa0270f9a2d66b1218c12c05062e0] Revert "tc35815: fix iomap leak" git bisect bad 1e2cfeef060fa0270f9a2d66b1218c12c05062e0 # bad: [d9bed6bbd4f2a0120c93fed68605950651e1f225] isdn/gigaset: remove EXPERIMENTAL tag from GIGASET_CAPI git bisect bad d9bed6bbd4f2a0120c93fed68605950651e1f225 # bad: [d117b6665847084cfe8a44b870f771153e18991d] fealnx: Use the instance of net_device_stats from net_device. git bisect bad d117b6665847084cfe8a44b870f771153e18991d # bad: [e490c1defec4236a6a131fe2d13bf7ba787c02f8] Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/kaber/nf-next-2.6 git bisect bad e490c1defec4236a6a131fe2d13bf7ba787c02f8 # bad: [0a17d8c744e44617a3c22e7af68b4c5c9c1c5dba] ixgbe: use NETIF_F_LRO git bisect bad 0a17d8c744e44617a3c22e7af68b4c5c9c1c5dba # bad: [ede3ef0d940ef052466f42c849390b23c6859abc] igb: fix PHY config access on 82580 git bisect bad ede3ef0d940ef052466f42c849390b23c6859abc # good: [ee3cb6295144b0adfa75ccaca307643a6998b1e2] be2net: changes to properly provide phy details git bisect good ee3cb6295144b0adfa75ccaca307643a6998b1e2 # bad: [7475271004b66e9c22e1bb28f240a38c5d6fe76e] x86: Drop CONFIG_MCORE2 check around setting of NET_IP_ALIGN git bisect bad 7475271004b66e9c22e1bb28f240a38c5d6fe76e brad@...t:/raid10/src/linux-2.6$ git bisect log git bisect start # good: [9fe6206f400646a2322096b56c59891d530e8d51] Linux 2.6.35 git bisect good 9fe6206f400646a2322096b56c59891d530e8d51 # bad: [da5cabf80e2433131bf0ed8993abc0f7ea618c73] Linux 2.6.36-rc1 git bisect bad da5cabf80e2433131bf0ed8993abc0f7ea618c73 # bad: [0f477dd0851bdcee82923da66a7fc4a44cb1bc3d] Merge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip git bisect bad 0f477dd0851bdcee82923da66a7fc4a44cb1bc3d # bad: [3ff1c25927e3af61c6bf0e4ed959504058ae4565] phy/marvell: add 88ec048 support git bisect bad 3ff1c25927e3af61c6bf0e4ed959504058ae4565 # good: [05318bc905467237d4aa68a701f6e92a2b332218] Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next-2.6 git bisect good 05318bc905467237d4aa68a701f6e92a2b332218 # bad: [2ba13ed678775195e8255b4e503c59d48b615bd8] Bluetooth: Remove check for supported mode git bisect bad 2ba13ed678775195e8255b4e503c59d48b615bd8 # bad: [1e2cfeef060fa0270f9a2d66b1218c12c05062e0] Revert "tc35815: fix iomap leak" git bisect bad 1e2cfeef060fa0270f9a2d66b1218c12c05062e0 # bad: [d9bed6bbd4f2a0120c93fed68605950651e1f225] isdn/gigaset: remove EXPERIMENTAL tag from GIGASET_CAPI git bisect bad d9bed6bbd4f2a0120c93fed68605950651e1f225 # bad: [d117b6665847084cfe8a44b870f771153e18991d] fealnx: Use the instance of net_device_stats from net_device. git bisect bad d117b6665847084cfe8a44b870f771153e18991d # bad: [e490c1defec4236a6a131fe2d13bf7ba787c02f8] Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/kaber/nf-next-2.6 git bisect bad e490c1defec4236a6a131fe2d13bf7ba787c02f8 # bad: [0a17d8c744e44617a3c22e7af68b4c5c9c1c5dba] ixgbe: use NETIF_F_LRO git bisect bad 0a17d8c744e44617a3c22e7af68b4c5c9c1c5dba # bad: [ede3ef0d940ef052466f42c849390b23c6859abc] igb: fix PHY config access on 82580 git bisect bad ede3ef0d940ef052466f42c849390b23c6859abc # good: [ee3cb6295144b0adfa75ccaca307643a6998b1e2] be2net: changes to properly provide phy details git bisect good ee3cb6295144b0adfa75ccaca307643a6998b1e2 # bad: [7475271004b66e9c22e1bb28f240a38c5d6fe76e] x86: Drop CONFIG_MCORE2 check around setting of NET_IP_ALIGN git bisect bad 7475271004b66e9c22e1bb28f240a38c5d6fe76e brad@...t:/raid10/src/linux-2.6$ git bisect good 7475271004b66e9c22e1bb28f240a38c5d6fe76e is the first bad commit commit 7475271004b66e9c22e1bb28f240a38c5d6fe76e Author: Alexander Duyck <alexander.h.duyck@...el.com> Date: Thu Jul 1 13:28:27 2010 +0000 x86: Drop CONFIG_MCORE2 check around setting of NET_IP_ALIGN This patch removes the CONFIG_MCORE2 check from around NET_IP_ALIGN. It is based on a suggestion from Andi Kleen. The assumption is that there are not any x86 cores where unaligned access is really slow, and this change would allow for a performance improvement to still exist on configurations that are not necessarily optimized for Core 2. Cc: Andi Kleen <ak@...ux.intel.com> Cc: Thomas Gleixner <tglx@...utronix.de> Cc: Ingo Molnar <mingo@...hat.com> Cc: "H. Peter Anvin" <hpa@...or.com> Cc: x86@...nel.org Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com> Acked-by: H. Peter Anvin <hpa@...or.com> Signed-off-by: David S. Miller <davem@...emloft.net> :040000 040000 5a15867789080a2f67a74b17c4422f85b7a9fb4a b98769348bd765731ca3ff03b33764257e23226c M arch I can confirm this bug exists in the 3.0 kernel, however I'm unable to reproduce it on todays git. So anyone using netfilter, kvm and bridge on kernels between 2.6.36-rc1 and 3.0 may hit this bug, but it looks like it is fixed in the current 3.1-rc kernels. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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