From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paolo Ornati Subject: Re: WARNING: at arch/x86_64/kernel/smp.c:379 smp_call_function_single() Date: Mon, 13 Aug 2007 13:42:37 +0200 Message-ID: <20070813134237.23f4b5a1@localhost> References: <20070810134140.2806b587@localhost> <6bffcb0e0708100504n7fbafb5bt6a35165277dc767a@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org, Linux Kernel Mailing List To: "Michal Piotrowski" Return-path: In-Reply-To: <6bffcb0e0708100504n7fbafb5bt6a35165277dc767a-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: kvm.vger.kernel.org On Fri, 10 Aug 2007 14:04:33 +0200 "Michal Piotrowski" wrote: > > [ 756.707601] Disabling non-boot CPUs ... > > [ 756.712034] kvm: disabling virtualization on CPU1 > > [ 756.712037] WARNING: at arch/x86_64/kernel/smp.c:379 smp_call_function_single() > > [ 756.712039] > > [ 756.712039] Call Trace: > > [ 756.712046] [] smp_call_function_single+0x119/0x120 > > [ 756.712050] [] thread_return+0x1bf/0x626 > > [ 756.712054] [] sys_sched_yield+0x2b/0x80 > > [ 756.712057] [] kvm_cpu_hotplug+0x4b/0xa0 > > [ 756.712060] [] notifier_call_chain+0x53/0x80 > > [ 756.712062] [] __raw_notifier_call_chain+0x9/0x10 > > [ 756.712065] [] raw_notifier_call_chain+0x11/0x20 > > [ 756.712068] [] take_cpu_down+0x1b/0x30 > > [ 756.712071] [] do_stop+0xd2/0x150 > > [ 756.712073] [] do_stop+0x0/0x150 > > [ 756.712076] [] kthread+0x4d/0x80 > > [ 756.712079] [] child_rip+0xa/0x12 > > [ 756.712081] [] restore_args+0x0/0x30 > > [ 756.712084] [] kthread+0x0/0x80 > > [ 756.712086] [] child_rip+0x0/0x12 > > [ 756.712087] > > [ 756.815693] CPU 1 is now offline > > [ 756.815697] lockdep: not fixing up alternatives. > > [ 756.819276] CPU1 is down > > > > Added to KR list, thanks for the report. I've bisected it down to this commit: cec9ad279b66793bee0b5009b7ca311060061efd KVM: Use CPU_DYING for disabling virtualization Only at the CPU_DYING stage can we be sure that no user process will be scheduled onto the cpu and oops when trying to use virtualization extensions. $ git-bisect log git-bisect start # bad: [f695baf2df9e0413d3521661070103711545207a] Linux 2.6.23-rc1 git-bisect bad f695baf2df9e0413d3521661070103711545207a # good: [7dcca30a32aadb0520417521b0c44f42d09fe05c] Linux 2.6.22 git-bisect good 7dcca30a32aadb0520417521b0c44f42d09fe05c # good: [1f1c2881f673671539b25686df463518d69c4649] Merge branch 'upstream-linus' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik/netdev-2.6 git-bisect good 1f1c2881f673671539b25686df463518d69c4649 # bad: [3cf01f28c303be34f18cb4f6204cf1bdfe12ba7c] coda: remove statistics counters from /proc/fs/coda git-bisect bad 3cf01f28c303be34f18cb4f6204cf1bdfe12ba7c # bad: [b8c638acacfe32c0bde361916467af00691f1965] Merge branch 'uninit-var' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik/misc-2.6 git-bisect bad b8c638acacfe32c0bde361916467af00691f1965 # good: [c06e677aed0c86480b01faa894967daa8aa3568a] SPI: add 3wire mode flag git-bisect good c06e677aed0c86480b01faa894967daa8aa3568a # good: [90da63e54604fd515c17014a0a7f332a018a0a11] fbdev: extract fb_show_logo_line() git-bisect good 90da63e54604fd515c17014a0a7f332a018a0a11 # good: [e495606dd09d79f9fa496334ac3958f6ff179d82] KVM: Clean up #includes git-bisect good e495606dd09d79f9fa496334ac3958f6ff179d82 # good: [27d41718157626e4509026c7dac247a659c0e71f] mark a bunch of ISA|EISA|PCI drivers as such git-bisect good 27d41718157626e4509026c7dac247a659c0e71f # bad: [3bd858ab1c451725c07a805dcb315215dc85b86e] Introduce is_owner_or_cap() to wrap CAP_FOWNER use with fsuid check git-bisect bad 3bd858ab1c451725c07a805dcb315215dc85b86e # bad: [cec9ad279b66793bee0b5009b7ca311060061efd] KVM: Use CPU_DYING for disabling virtualization git-bisect bad cec9ad279b66793bee0b5009b7ca311060061efd # good: [4055551bbcb0d0be8c916134b4e9074826e89638] x86_64: Allow smp_call_function_single() to current cpu git-bisect good 4055551bbcb0d0be8c916134b4e9074826e89638 # good: [a52b1752c077cb919b71167c54968a0b91673281] SMP: Allow smp_call_function_single() to current cpu git-bisect good a52b1752c077cb919b71167c54968a0b91673281 # good: [4267c41a458cd7d287dc8031468fc385c2f5b2c3] KVM: Tune hotplug/suspend IPIs git-bisect good 4267c41a458cd7d287dc8031468fc385c2f5b2c3 -- Paolo Ornati Linux 2.6.23-rc3 on x86_64 ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/