From: Gleb Natapov <gleb@redhat.com>
To: Sasha Levin <levinsasha928@gmail.com>
Cc: Avi Kivity <avi@redhat.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@elte.hu>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
kvm <kvm@vger.kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
Dave Jones <davej@redhat.com>
Subject: Re: kvm: RCU warning in async pf
Date: Tue, 3 Apr 2012 13:52:26 +0300 [thread overview]
Message-ID: <20120403105226.GF14939@redhat.com> (raw)
In-Reply-To: <1333414472.11455.7.camel@lappy>
On Mon, Apr 02, 2012 at 08:54:32PM -0400, Sasha Levin wrote:
> Hi all,
>
> I got the spew at the bottom of the mail in a KVM guest using the KVM tools and running trinity.
>
> I'm not quite sure how default_idle managed to trigger a pagefault, so that part looks odd to me.
>
This is not regular page fault. This is async page fault that tells the
guest that a page, previously swapped out by hypervisor, is now swapped
back in and it can happen while vcpu is idle. The code does not leave
idle state properly though. We probably need to call rcu_irq_enter()
there. Will look into it.
> [12140.220507] ===============================
> [12140.220507] [ INFO: suspicious RCU usage. ]
> [12140.220507] 3.4.0-rc1-next-20120402-sasha #46 Tainted: G W
> [12140.220507] -------------------------------
> [12140.220507] include/linux/rcupdate.h:729 rcu_read_lock() used illegally while idle!
> [12140.220507]
> [12140.220507] other info that might help us debug this:
> [12140.220507]
> [12140.220507]
> [12140.220507] RCU used illegally from idle CPU!
> [12140.220507] rcu_scheduler_active = 1, debug_locks = 1
> [12140.220507] RCU used illegally from extended quiescent state!
> [12140.220507] 4 locks held by swapper/1/0:
> [12140.253991] #0: (&(&async_pf_sleepers[i].lock)->rlock){..-...}, at: [<ffffffff8107cdc8>] kvm_async_pf_task_wake+0x48/0x130
> [12140.253991] #1: (&n.wq){......}, at: [<ffffffff810e200d>] __wake_up+0x2d/0x70
> [12140.253991] #2: (&p->pi_lock){-.-.-.}, at: [<ffffffff810ec404>] try_to_wake_up+0x34/0x290
> [12140.253991] #3: (rcu_read_lock){.+.+..}, at: [<ffffffff810f3c80>] select_task_rq_fair+0xb0/0x5c0
> [12140.253991]
> [12140.253991] stack backtrace:
> [12140.253991] Pid: 0, comm: swapper/1 Tainted: G W 3.4.0-rc1-next-20120402-sasha #46
> [12140.253991] Call Trace:
> [12140.253991] [<ffffffff81114173>] lockdep_rcu_suspicious+0x113/0x130
> [12140.253991] [<ffffffff810f3ce5>] select_task_rq_fair+0x115/0x5c0
> [12140.253991] [<ffffffff810f3c80>] ? select_task_rq_fair+0xb0/0x5c0
> [12140.253991] [<ffffffff810ec404>] ? try_to_wake_up+0x34/0x290
> [12140.253991] [<ffffffff810ec404>] ? try_to_wake_up+0x34/0x290
> [12140.253991] [<ffffffff810ec561>] try_to_wake_up+0x191/0x290
> [12140.253991] [<ffffffff81114850>] ? __lock_acquired+0x1c0/0x210
> [12140.253991] [<ffffffff810ec66d>] default_wake_function+0xd/0x10
> [12140.253991] [<ffffffff810d7208>] autoremove_wake_function+0x18/0x40
> [12140.253991] [<ffffffff810e11e2>] __wake_up_common+0x52/0x90
> [12140.253991] [<ffffffff810e200d>] ? __wake_up+0x2d/0x70
> [12140.253991] [<ffffffff810e2023>] __wake_up+0x43/0x70
> [12140.253991] [<ffffffff8107cb07>] apf_task_wake_one+0x87/0x90
> [12140.253991] [<ffffffff8107cdf5>] kvm_async_pf_task_wake+0x75/0x130
> [12140.253991] [<ffffffff8107d1e6>] do_async_page_fault+0x86/0xa0
> [12140.253991] [<ffffffff82657a55>] async_page_fault+0x25/0x30
> [12140.253991] [<ffffffff8107d626>] ? native_safe_halt+0x6/0x10
> [12140.253991] [<ffffffff81116fed>] ? trace_hardirqs_on+0xd/0x10
> [12140.253991] [<ffffffff8105857d>] default_idle+0x4d/0xa0
> [12140.253991] [<ffffffff810582af>] cpu_idle+0x11f/0x180
> [12140.253991] [<ffffffff8264b9e0>] ? setup_APIC_timer+0x88/0x8c
> [12140.253991] [<ffffffff8264b004>] start_secondary+0xe1/0xe8
> [12140.253991]
> [12140.253991] ===============================
> [12140.253991] [ INFO: suspicious RCU usage. ]
> [12140.253991] 3.4.0-rc1-next-20120402-sasha #46 Tainted: G W
> [12140.253991] -------------------------------
> [12140.253991] kernel/sched/fair.c:2716 suspicious rcu_dereference_check() usage!
> [12140.253991]
> [12140.253991] other info that might help us debug this:
> [12140.253991]
> [12140.253991]
> [12140.253991] RCU used illegally from idle CPU!
> [12140.253991] rcu_scheduler_active = 1, debug_locks = 1
> [12140.253991] RCU used illegally from extended quiescent state!
> [12140.253991] 4 locks held by swapper/1/0:
> [12140.253991] #0: (&(&async_pf_sleepers[i].lock)->rlock){..-...}, at: [<ffffffff8107cdc8>] kvm_async_pf_task_wake+0x48/0x130
> [12140.253991] #1: (&n.wq){......}, at: [<ffffffff810e200d>] __wake_up+0x2d/0x70
> [12140.253991] #2: (&p->pi_lock){-.-.-.}, at: [<ffffffff810ec404>] try_to_wake_up+0x34/0x290
> [12140.253991] #3: (rcu_read_lock){.+.+..}, at: [<ffffffff810f3c80>] select_task_rq_fair+0xb0/0x5c0
> [12140.253991]
> [12140.253991] stack backtrace:
> [12140.253991] Pid: 0, comm: swapper/1 Tainted: G W 3.4.0-rc1-next-20120402-sasha #46
> [12140.253991] Call Trace:
> [12140.253991] [<ffffffff81114173>] lockdep_rcu_suspicious+0x113/0x130
> [12140.253991] [<ffffffff810f3d4c>] select_task_rq_fair+0x17c/0x5c0
> [12140.253991] [<ffffffff810f3c80>] ? select_task_rq_fair+0xb0/0x5c0
> [12140.253991] [<ffffffff810ec404>] ? try_to_wake_up+0x34/0x290
> [12140.253991] [<ffffffff810ec404>] ? try_to_wake_up+0x34/0x290
> [12140.253991] [<ffffffff810ec561>] try_to_wake_up+0x191/0x290
> [12140.253991] [<ffffffff81114850>] ? __lock_acquired+0x1c0/0x210
> [12140.253991] [<ffffffff810ec66d>] default_wake_function+0xd/0x10
> [12140.253991] [<ffffffff810d7208>] autoremove_wake_function+0x18/0x40
> [12140.253991] [<ffffffff810e11e2>] __wake_up_common+0x52/0x90
> [12140.253991] [<ffffffff810e200d>] ? __wake_up+0x2d/0x70
> [12140.253991] [<ffffffff810e2023>] __wake_up+0x43/0x70
> [12140.253991] [<ffffffff8107cb07>] apf_task_wake_one+0x87/0x90
> [12140.253991] [<ffffffff8107cdf5>] kvm_async_pf_task_wake+0x75/0x130
> [12140.253991] [<ffffffff8107d1e6>] do_async_page_fault+0x86/0xa0
> [12140.253991] [<ffffffff82657a55>] async_page_fault+0x25/0x30
> [12140.253991] [<ffffffff8107d626>] ? native_safe_halt+0x6/0x10
> [12140.253991] [<ffffffff81116fed>] ? trace_hardirqs_on+0xd/0x10
> [12140.253991] [<ffffffff8105857d>] default_idle+0x4d/0xa0
> [12140.253991] [<ffffffff810582af>] cpu_idle+0x11f/0x180
> [12140.253991] [<ffffffff8264b9e0>] ? setup_APIC_timer+0x88/0x8c
> [12140.253991] [<ffffffff8264b004>] start_secondary+0xe1/0xe8
> [12140.253991]
> [12140.253991] ===============================
> [12140.253991] [ INFO: suspicious RCU usage. ]
> [12140.253991] 3.4.0-rc1-next-20120402-sasha #46 Tainted: G W
> [12140.253991] -------------------------------
> [12140.253991] kernel/sched/fair.c:2660 suspicious rcu_dereference_check() usage!
> [12140.253991]
> [12140.253991] other info that might help us debug this:
> [12140.253991]
> [12140.253991]
> [12140.253991] RCU used illegally from idle CPU!
> [12140.253991] rcu_scheduler_active = 1, debug_locks = 1
> [12140.253991] RCU used illegally from extended quiescent state!
> [12140.253991] 4 locks held by swapper/1/0:
> [12140.253991] #0: (&(&async_pf_sleepers[i].lock)->rlock){..-...}, at: [<ffffffff8107cdc8>] kvm_async_pf_task_wake+0x48/0x130
> [12140.253991] #1: (&n.wq){......}, at: [<ffffffff810e200d>] __wake_up+0x2d/0x70
> [12140.253991] #2: (&p->pi_lock){-.-.-.}, at: [<ffffffff810ec404>] try_to_wake_up+0x34/0x290
> [12140.253991] #3: (rcu_read_lock){.+.+..}, at: [<ffffffff810f3c80>] select_task_rq_fair+0xb0/0x5c0
> [12140.253991]
> [12140.253991] stack backtrace:
> [12140.253991] Pid: 0, comm: swapper/1 Tainted: G W 3.4.0-rc1-next-20120402-sasha #46
> [12140.253991] Call Trace:
> [12140.253991] [<ffffffff81114173>] lockdep_rcu_suspicious+0x113/0x130
> [12140.253991] [<ffffffff810f062f>] select_idle_sibling+0xaf/0x1c0
> [12140.253991] [<ffffffff810f3f51>] select_task_rq_fair+0x381/0x5c0
> [12140.253991] [<ffffffff810f3c80>] ? select_task_rq_fair+0xb0/0x5c0
> [12140.253991] [<ffffffff810ec404>] ? try_to_wake_up+0x34/0x290
> [12140.253991] [<ffffffff810ec404>] ? try_to_wake_up+0x34/0x290
> [12140.253991] [<ffffffff810ec561>] try_to_wake_up+0x191/0x290
> [12140.253991] [<ffffffff81114850>] ? __lock_acquired+0x1c0/0x210
> [12140.253991] [<ffffffff810ec66d>] default_wake_function+0xd/0x10
> [12140.253991] [<ffffffff810d7208>] autoremove_wake_function+0x18/0x40
> [12140.253991] [<ffffffff810e11e2>] __wake_up_common+0x52/0x90
> [12140.253991] [<ffffffff810e200d>] ? __wake_up+0x2d/0x70
> [12140.253991] [<ffffffff810e2023>] __wake_up+0x43/0x70
> [12140.253991] [<ffffffff8107cb07>] apf_task_wake_one+0x87/0x90
> [12140.253991] [<ffffffff8107cdf5>] kvm_async_pf_task_wake+0x75/0x130
> [12140.253991] [<ffffffff8107d1e6>] do_async_page_fault+0x86/0xa0
> [12140.253991] [<ffffffff82657a55>] async_page_fault+0x25/0x30
> [12140.253991] [<ffffffff8107d626>] ? native_safe_halt+0x6/0x10
> [12140.253991] [<ffffffff81116fed>] ? trace_hardirqs_on+0xd/0x10
> [12140.253991] [<ffffffff8105857d>] default_idle+0x4d/0xa0
> [12140.253991] [<ffffffff810582af>] cpu_idle+0x11f/0x180
> [12140.253991] [<ffffffff8264b9e0>] ? setup_APIC_timer+0x88/0x8c
> [12140.253991] [<ffffffff8264b004>] start_secondary+0xe1/0xe8
> [12140.253991]
> [12140.253991] ===============================
> [12140.253991] [ INFO: suspicious RCU usage. ]
> [12140.253991] 3.4.0-rc1-next-20120402-sasha #46 Tainted: G W
> [12140.253991] -------------------------------
> [12140.253991] include/linux/rcupdate.h:750 rcu_read_unlock() used illegally while idle!
> [12140.253991]
> [12140.253991] other info that might help us debug this:
> [12140.253991]
> [12140.253991]
> [12140.253991] RCU used illegally from idle CPU!
> [12140.253991] rcu_scheduler_active = 1, debug_locks = 1
> [12140.253991] RCU used illegally from extended quiescent state!
> [12140.253991] 4 locks held by swapper/1/0:
> [12140.253991] #0: (&(&async_pf_sleepers[i].lock)->rlock){..-...}, at: [<ffffffff8107cdc8>] kvm_async_pf_task_wake+0x48/0x130
> [12140.253991] #1: (&n.wq){......}, at: [<ffffffff810e200d>] __wake_up+0x2d/0x70
> [12140.253991] #2: (&p->pi_lock){-.-.-.}, at: [<ffffffff810ec404>] try_to_wake_up+0x34/0x290
> [12140.253991] #3: (rcu_read_lock){.+.+..}, at: [<ffffffff810f3c80>] select_task_rq_fair+0xb0/0x5c0
> [12140.253991]
> [12140.253991] stack backtrace:
> [12140.253991] Pid: 0, comm: swapper/1 Tainted: G W 3.4.0-rc1-next-20120402-sasha #46
> [12140.253991] Call Trace:
> [12140.253991] [<ffffffff81114173>] lockdep_rcu_suspicious+0x113/0x130
> [12140.253991] [<ffffffff810f412a>] select_task_rq_fair+0x55a/0x5c0
> [12140.253991] [<ffffffff810f3c80>] ? select_task_rq_fair+0xb0/0x5c0
> [12140.253991] [<ffffffff810ec404>] ? try_to_wake_up+0x34/0x290
> [12140.253991] [<ffffffff810ec404>] ? try_to_wake_up+0x34/0x290
> [12140.253991] [<ffffffff810ec561>] try_to_wake_up+0x191/0x290
> [12140.253991] [<ffffffff81114850>] ? __lock_acquired+0x1c0/0x210
> [12140.253991] [<ffffffff810ec66d>] default_wake_function+0xd/0x10
> [12140.253991] [<ffffffff810d7208>] autoremove_wake_function+0x18/0x40
> [12140.253991] [<ffffffff810e11e2>] __wake_up_common+0x52/0x90
> [12140.253991] [<ffffffff810e200d>] ? __wake_up+0x2d/0x70
> [12140.253991] [<ffffffff810e2023>] __wake_up+0x43/0x70
> [12140.253991] [<ffffffff8107cb07>] apf_task_wake_one+0x87/0x90
> [12140.253991] [<ffffffff8107cdf5>] kvm_async_pf_task_wake+0x75/0x130
> [12140.253991] [<ffffffff8107d1e6>] do_async_page_fault+0x86/0xa0
> [12140.253991] [<ffffffff82657a55>] async_page_fault+0x25/0x30
> [12140.253991] [<ffffffff8107d626>] ? native_safe_halt+0x6/0x10
> [12140.253991] [<ffffffff81116fed>] ? trace_hardirqs_on+0xd/0x10
> [12140.253991] [<ffffffff8105857d>] default_idle+0x4d/0xa0
> [12140.253991] [<ffffffff810582af>] cpu_idle+0x11f/0x180
> [12140.253991] [<ffffffff8264b9e0>] ? setup_APIC_timer+0x88/0x8c
> [12140.253991] [<ffffffff8264b004>] start_secondary+0xe1/0xe8
> [12140.623131]
> [12140.623131] ===============================
> [12140.623131] [ INFO: suspicious RCU usage. ]
> [12140.623131] 3.4.0-rc1-next-20120402-sasha #46 Tainted: G W
> [12140.623131] -------------------------------
> [12140.623131] include/linux/rcupdate.h:729 rcu_read_lock() used illegally while idle!
> [12140.623131]
> [12140.623131] other info that might help us debug this:
> [12140.623131]
> [12140.623131]
> [12140.623131] RCU used illegally from idle CPU!
> [12140.623131] rcu_scheduler_active = 1, debug_locks = 1
> [12140.623131] RCU used illegally from extended quiescent state!
> [12140.623131] 4 locks held by swapper/1/0:
> [12140.623131] #0: (&(&async_pf_sleepers[i].lock)->rlock){..-...}, at: [<ffffffff8107cdc8>] kvm_async_pf_task_wake+0x48/0x130
> [12140.623131] #1: (&n.wq){......}, at: [<ffffffff810e200d>] __wake_up+0x2d/0x70
> [12140.623131] #2: (&p->pi_lock){-.-.-.}, at: [<ffffffff810ec404>] try_to_wake_up+0x34/0x290
> [12140.623131] #3: (rcu_read_lock){.+.+..}, at: [<ffffffff810ea4c0>] ttwu_stat+0x50/0x230
> [12140.623131]
> [12140.623131] stack backtrace:
> [12140.623131] Pid: 0, comm: swapper/1 Tainted: G W 3.4.0-rc1-next-20120402-sasha #46
> [12140.623131] Call Trace:
> [12140.623131] [<ffffffff81114173>] lockdep_rcu_suspicious+0x113/0x130
> [12140.623131] [<ffffffff810ea537>] ttwu_stat+0xc7/0x230
> [12140.623131] [<ffffffff810ea4c0>] ? ttwu_stat+0x50/0x230
> [12140.623131] [<ffffffff810ec404>] ? try_to_wake_up+0x34/0x290
> [12140.623131] [<ffffffff810ec62a>] try_to_wake_up+0x25a/0x290
> [12140.623131] [<ffffffff81114850>] ? __lock_acquired+0x1c0/0x210
> [12140.623131] [<ffffffff810ec66d>] default_wake_function+0xd/0x10
> [12140.623131] [<ffffffff810d7208>] autoremove_wake_function+0x18/0x40
> [12140.623131] [<ffffffff810e11e2>] __wake_up_common+0x52/0x90
> [12140.623131] [<ffffffff810e200d>] ? __wake_up+0x2d/0x70
> [12140.623131] [<ffffffff810e2023>] __wake_up+0x43/0x70
> [12140.623131] [<ffffffff8107cb07>] apf_task_wake_one+0x87/0x90
> [12140.623131] [<ffffffff8107cdf5>] kvm_async_pf_task_wake+0x75/0x130
> [12140.623131] [<ffffffff8107d1e6>] do_async_page_fault+0x86/0xa0
> [12140.623131] [<ffffffff82657a55>] async_page_fault+0x25/0x30
> [12140.623131] [<ffffffff8107d626>] ? native_safe_halt+0x6/0x10
> [12140.623131] [<ffffffff81116fed>] ? trace_hardirqs_on+0xd/0x10
> [12140.623131] [<ffffffff8105857d>] default_idle+0x4d/0xa0
> [12140.623131] [<ffffffff810582af>] cpu_idle+0x11f/0x180
> [12140.623131] [<ffffffff8264b9e0>] ? setup_APIC_timer+0x88/0x8c
> [12140.623131] [<ffffffff8264b004>] start_secondary+0xe1/0xe8
> [12140.623131]
> [12140.623131] ===============================
> [12140.623131] [ INFO: suspicious RCU usage. ]
> [12140.623131] 3.4.0-rc1-next-20120402-sasha #46 Tainted: G W
> [12140.623131] -------------------------------
> [12140.623131] kernel/sched/core.c:1375 suspicious rcu_dereference_check() usage!
> [12140.623131]
> [12140.623131] other info that might help us debug this:
> [12140.623131]
> [12140.623131]
> [12140.623131] RCU used illegally from idle CPU!
> [12140.623131] rcu_scheduler_active = 1, debug_locks = 1
> [12140.623131] RCU used illegally from extended quiescent state!
> [12140.623131] 4 locks held by swapper/1/0:
> [12140.623131] #0: (&(&async_pf_sleepers[i].lock)->rlock){..-...}, at: [<ffffffff8107cdc8>] kvm_async_pf_task_wake+0x48/0x130
> [12140.623131] #1: (&n.wq){......}, at: [<ffffffff810e200d>] __wake_up+0x2d/0x70
> [12140.623131] #2: (&p->pi_lock){-.-.-.}, at: [<ffffffff810ec404>] try_to_wake_up+0x34/0x290
> [12140.623131] #3: (rcu_read_lock){.+.+..}, at: [<ffffffff810ea4c0>] ttwu_stat+0x50/0x230
> [12140.623131]
> [12140.623131] stack backtrace:
> [12140.623131] Pid: 0, comm: swapper/1 Tainted: G W 3.4.0-rc1-next-20120402-sasha #46
> [12140.623131] Call Trace:
> [12140.623131] [<ffffffff81114173>] lockdep_rcu_suspicious+0x113/0x130
> [12140.623131] [<ffffffff810ea5a8>] ttwu_stat+0x138/0x230
> [12140.623131] [<ffffffff810ea4c0>] ? ttwu_stat+0x50/0x230
> [12140.623131] [<ffffffff810ec404>] ? try_to_wake_up+0x34/0x290
> [12140.623131] [<ffffffff810ec62a>] try_to_wake_up+0x25a/0x290
> [12140.623131] [<ffffffff81114850>] ? __lock_acquired+0x1c0/0x210
> [12140.623131] [<ffffffff810ec66d>] default_wake_function+0xd/0x10
> [12140.623131] [<ffffffff810d7208>] autoremove_wake_function+0x18/0x40
> [12140.623131] [<ffffffff810e11e2>] __wake_up_common+0x52/0x90
> [12140.623131] [<ffffffff810e200d>] ? __wake_up+0x2d/0x70
> [12140.623131] [<ffffffff810e2023>] __wake_up+0x43/0x70
> [12140.623131] [<ffffffff8107cb07>] apf_task_wake_one+0x87/0x90
> [12140.623131] [<ffffffff8107cdf5>] kvm_async_pf_task_wake+0x75/0x130
> [12140.623131] [<ffffffff8107d1e6>] do_async_page_fault+0x86/0xa0
> [12140.623131] [<ffffffff82657a55>] async_page_fault+0x25/0x30
> [12140.623131] [<ffffffff8107d626>] ? native_safe_halt+0x6/0x10
> [12140.623131] [<ffffffff81116fed>] ? trace_hardirqs_on+0xd/0x10
> [12140.623131] [<ffffffff8105857d>] default_idle+0x4d/0xa0
> [12140.623131] [<ffffffff810582af>] cpu_idle+0x11f/0x180
> [12140.623131] [<ffffffff8264b9e0>] ? setup_APIC_timer+0x88/0x8c
> [12140.623131] [<ffffffff8264b004>] start_secondary+0xe1/0xe8
> [12140.623131]
> [12140.623131] ===============================
> [12140.623131] [ INFO: suspicious RCU usage. ]
> [12140.623131] 3.4.0-rc1-next-20120402-sasha #46 Tainted: G W
> [12140.623131] -------------------------------
> [12140.623131] include/linux/rcupdate.h:750 rcu_read_unlock() used illegally while idle!
> [12140.623131]
> [12140.623131] other info that might help us debug this:
> [12140.623131]
> [12140.623131]
> [12140.623131] RCU used illegally from idle CPU!
> [12140.623131] rcu_scheduler_active = 1, debug_locks = 1
> [12140.623131] RCU used illegally from extended quiescent state!
> [12140.623131] 4 locks held by swapper/1/0:
> [12140.623131] #0: (&(&async_pf_sleepers[i].lock)->rlock){..-...}, at: [<ffffffff8107cdc8>] kvm_async_pf_task_wake+0x48/0x130
> [12140.623131] #1: (&n.wq){......}, at: [<ffffffff810e200d>] __wake_up+0x2d/0x70
> [12140.623131] #2: (&p->pi_lock){-.-.-.}, at: [<ffffffff810ec404>] try_to_wake_up+0x34/0x290
> [12140.623131] #3: (rcu_read_lock){.+.+..}, at: [<ffffffff810ea4c0>] ttwu_stat+0x50/0x230
> [12140.623131]
> [12140.623131] stack backtrace:
> [12140.623131] Pid: 0, comm: swapper/1 Tainted: G W 3.4.0-rc1-next-20120402-sasha #46
> [12140.623131] Call Trace:
> [12140.623131] [<ffffffff81114173>] lockdep_rcu_suspicious+0x113/0x130
> [12140.623131] [<ffffffff810ea643>] ttwu_stat+0x1d3/0x230
> [12140.623131] [<ffffffff810ea4c0>] ? ttwu_stat+0x50/0x230
> [12140.623131] [<ffffffff810ec404>] ? try_to_wake_up+0x34/0x290
> [12140.623131] [<ffffffff810ec62a>] try_to_wake_up+0x25a/0x290
> [12140.623131] [<ffffffff81114850>] ? __lock_acquired+0x1c0/0x210
> [12140.623131] [<ffffffff810ec66d>] default_wake_function+0xd/0x10
> [12140.623131] [<ffffffff810d7208>] autoremove_wake_function+0x18/0x40
> [12140.623131] [<ffffffff810e11e2>] __wake_up_common+0x52/0x90
> [12140.623131] [<ffffffff810e200d>] ? __wake_up+0x2d/0x70
> [12140.623131] [<ffffffff810e2023>] __wake_up+0x43/0x70
> [12140.623131] [<ffffffff8107cb07>] apf_task_wake_one+0x87/0x90
> [12140.623131] [<ffffffff8107cdf5>] kvm_async_pf_task_wake+0x75/0x130
> [12140.623131] [<ffffffff8107d1e6>] do_async_page_fault+0x86/0xa0
> [12140.623131] [<ffffffff82657a55>] async_page_fault+0x25/0x30
> [12140.623131] [<ffffffff8107d626>] ? native_safe_halt+0x6/0x10
> [12140.623131] [<ffffffff81116fed>] ? trace_hardirqs_on+0xd/0x10
> [12140.623131] [<ffffffff8105857d>] default_idle+0x4d/0xa0
> [12140.623131] [<ffffffff810582af>] cpu_idle+0x11f/0x180
> [12140.623131] [<ffffffff8264b9e0>] ? setup_APIC_timer+0x88/0x8c
> [12140.623131] [<ffffffff8264b004>] start_secondary+0xe1/0xe8
>
> --
>
> Sasha.
--
Gleb.
next prev parent reply other threads:[~2012-04-03 10:52 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-03 0:54 kvm: RCU warning in async pf Sasha Levin
2012-04-03 10:52 ` Gleb Natapov [this message]
2012-04-04 12:30 ` Gleb Natapov
2012-04-04 14:04 ` Paul E. McKenney
2012-04-04 14:18 ` Gleb Natapov
2012-04-04 20:13 ` Sasha Levin
2012-04-05 16:10 ` Avi Kivity
2012-04-14 9:44 ` Peter Zijlstra
2012-04-16 10:28 ` Gleb Natapov
2012-04-16 12:58 ` Gleb Natapov
2012-04-16 13:05 ` Peter Zijlstra
2012-04-16 13:08 ` Gleb Natapov
2012-04-16 13:18 ` Peter Zijlstra
2012-04-16 13:27 ` Peter Zijlstra
2012-04-16 14:17 ` Gleb Natapov
2012-04-16 14:24 ` Peter Zijlstra
2012-04-03 13:06 ` Paul E. McKenney
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20120403105226.GF14939@redhat.com \
--to=gleb@redhat.com \
--cc=avi@redhat.com \
--cc=davej@redhat.com \
--cc=kvm@vger.kernel.org \
--cc=levinsasha928@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=mtosatti@redhat.com \
--cc=paulmck@linux.vnet.ibm.com \
--cc=peterz@infradead.org \
--cc=tglx@linutronix.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox