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Date: Mon, 17 Dec 2012 15:46:34 -0500 From: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> To: Sander Eikelenboom <linux@...elenboom.it>, fenghua.yu@...el.com Cc: xen-devel <xen-devel@...ts.xen.org>, linux-kernel@...r.kernel.org, hpa@...ux.intel.com Subject: Re: 3.8.0-rc0 on xen-unstable: RCU Stall during boot as dom0 kernel after IOAPIC On Mon, Dec 17, 2012 at 09:32:17PM +0100, Sander Eikelenboom wrote: > > Sunday, December 16, 2012, 6:38:24 PM, you wrote: > > > On Fri, Dec 14, 2012 at 04:55:57PM +0100, Sander Eikelenboom wrote: > >> Hi Konrad, > >> > >> I just tried to boot a 3.8.0-rc0 kernel (last commit: 7313264b899bbf3988841296265a6e0e8a7b6521) as dom0 on my machine with current xen-unstable. > > > Yeah, saw it over the Dec 11->Dec 12 merges and was out on > > vacation during that time (just got back). > > > Did you by any chance try to do a git bisect to narrow down > > which merge it was? > > Hi Konrad, Hey Sander, Thank you for doing the bisection. Fenghua - any ideas what might be amiss in the Xen subsystem? I hadn't looked at the patchset of the CPU0 offlining/onlining so I am not completly up to speed on the particulars of the patches. > > With some more effort it leads to: > > git bisect start > # bad: [fa4c95bfdb85d568ae327d57aa33a4f55bab79c4] Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs > git bisect bad fa4c95bfdb85d568ae327d57aa33a4f55bab79c4 > # good: [29594404d7fe73cd80eaa4ee8c43dcc53970c60e] Linux 3.7 > git bisect good 29594404d7fe73cd80eaa4ee8c43dcc53970c60e > # bad: [98870901cce098bbe94d90d2c41d8d1fa8d94392] mm/bootmem.c: remove unused wrapper function reserve_bootmem_generic() > git bisect bad 98870901cce098bbe94d90d2c41d8d1fa8d94392 > # good: [8966961b31c251b854169e9886394c2a20f2cea7] Merge tag 'staging-3.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging > git bisect good 8966961b31c251b854169e9886394c2a20f2cea7 > # bad: [22a40fd9a60388aec8106b0baffc8f59f83bb1b4] Merge tag 'dlm-3.8' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/linux-dlm > git bisect bad 22a40fd9a60388aec8106b0baffc8f59f83bb1b4 > # good: [aefb058b0c27dafb15072406fbfd92d2ac2c8790] Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip > git bisect good aefb058b0c27dafb15072406fbfd92d2ac2c8790 > # good: [b64c5fda3868cb29d5dae0909561aa7d93fb7330] Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip > git bisect good b64c5fda3868cb29d5dae0909561aa7d93fb7330 > # bad: [139353ffbe42ac7abda42f3259c1c374cbf4b779] Merge tag 'please-pull-einj-fix-for-acpi5' of git://git.kernel.org/pub/scm/linux/kernel/git/ras/ras > git bisect bad 139353ffbe42ac7abda42f3259c1c374cbf4b779 > # bad: [d07e43d70eef15a44a2c328a913d8d633a90e088] Merge branch 'omap-serial' of git://git.linaro.org/people/rmk/linux-arm > git bisect bad d07e43d70eef15a44a2c328a913d8d633a90e088 > # bad: [a05a4e24dcd73c2de4ef3f8d520b8bbb44570c60] Merge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip > git bisect bad a05a4e24dcd73c2de4ef3f8d520b8bbb44570c60 > # bad: [a71c8bc5dfefbbf80ef90739791554ef7ea4401b] x86, topology: Debug CPU0 hotplug > git bisect bad a71c8bc5dfefbbf80ef90739791554ef7ea4401b > # bad: [42e78e9719aa0c76711e2731b19c90fe5ae05278] x86-64, hotplug: Add start_cpu0() entry point to head_64.S > git bisect bad 42e78e9719aa0c76711e2731b19c90fe5ae05278 > # good: [4d25031a81d3cd32edc00de6596db76cc4010685] x86, topology: Don't offline CPU0 if any PIC irq can not be migrated out of it > git bisect good 4d25031a81d3cd32edc00de6596db76cc4010685 > # bad: [209efae12981f3d2d694499b761def10895c078c] x86, hotplug, suspend: Online CPU0 for suspend or hibernate > git bisect bad 209efae12981f3d2d694499b761def10895c078c > # bad: [30106c174311b8cfaaa3186c7f6f9c36c62d17da] x86, hotplug: Support functions for CPU0 online/offline > git bisect bad 30106c174311b8cfaaa3186c7f6f9c36c62d17da > > > > 30106c174311b8cfaaa3186c7f6f9c36c62d17da is the first bad commit > commit 30106c174311b8cfaaa3186c7f6f9c36c62d17da > Author: Fenghua Yu <fenghua.yu@...el.com> > Date: Tue Nov 13 11:32:41 2012 -0800 > > x86, hotplug: Support functions for CPU0 online/offline > > Add smp_store_boot_cpu_info() to store cpu info for BSP during boot time. > > Now smp_store_cpu_info() stores cpu info for bringing up BSP or AP after > it's offline. > > Continue to online CPU0 in native_cpu_up(). > > Continue to offline CPU0 in native_cpu_disable(). > > Signed-off-by: Fenghua Yu <fenghua.yu@...el.com> > Link: http://lkml.kernel.org/r/1352835171-3958-5-git-send-email-fenghua.yu@intel.com > Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com> > > :040000 040000 729e56e8eddaaf5d0f55257b82f28006dffb9aab d5c98e50cd92814351ee6c741b7e4c9afa29487c M arch > > > Which seems to be merged in http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=74b84233458e9db7c160cec67638efdbec748ca9 > > -- > > Sander > > > > Thanks! > >> The boot stalls: > >> > >> [ 0.000000] ACPI: PM-Timer IO Port: 0x808 > >> [ 0.000000] ACPI: Local APIC address 0xfee00000 > >> [ 0.000000] ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled) > >> [ 0.000000] ACPI: LAPIC (acpi_id[0x02] lapic_id[0x01] enabled) > >> [ 0.000000] ACPI: LAPIC (acpi_id[0x03] lapic_id[0x02] enabled) > >> [ 0.000000] ACPI: LAPIC (acpi_id[0x04] lapic_id[0x03] enabled) > >> [ 0.000000] ACPI: LAPIC (acpi_id[0x05] lapic_id[0x04] enabled) > >> [ 0.000000] ACPI: LAPIC (acpi_id[0x06] lapic_id[0x05] enabled) > >> [ 0.000000] ACPI: IOAPIC (id[0x06] address[0xfec00000] gsi_base[0]) > >> [ 0.000000] IOAPIC[0]: apic_id 6, version 33, address 0xfec00000, GSI 0-23 > >> [ 0.000000] ACPI: IOAPIC (id[0x07] address[0xfec20000] gsi_base[24]) > >> [ 0.000000] IOAPIC[1]: apic_id 7, version 33, address 0xfec20000, GSI 24- > >> [ 64.598628] INFO: rcu_preempt detected stalls on CPUs/tasks: > >> [ 64.598676] 0: (1 GPs behind) idle=aed/140000000000000/0 drain=5 . timer not pending > >> [ 64.598683] (detected by 1, t=18004 jiffies, g=18446744073709551414, c=18446744073709551413, q=162) > >> [ 64.598692] sending NMI to all CPUs: > >> [ 64.598716] xen: vector 0x2 is not implemented > >> > >> > >> Perhaps an interesting line is the incomplete (no end of range, and it stalls there some time before the kernel reports the stall itself: > >> [ 0.000000] IOAPIC[1]: apic_id 7, version 33, address 0xfec20000, GSI 24- > >> > >> > >> The exact seem config with 3.7.0 as kernel works fine. > >> Complete serial log is attached. > >> > >> -- > >> > >> Sander > >> > >> > > > > -- 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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