From: Pontus Fuchs <pontus.fuchs@gmail.com>
To: peterz@infradead.org
Cc: mingo@redhat.com,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Regression: sched/preempt: Add static_key() to preempt_notifiers breaks my KVM
Date: Thu, 25 Jun 2015 14:00:02 +0200 [thread overview]
Message-ID: <558BED42.1030000@gmail.com> (raw)
Hi,
On 4.1+ kernels I can no longer start my KVM guest. Upon trying to start
it I can see the following log message:
[ 25.821060] BUG: sleeping function called from invalid context at
kernel/locking/mutex.c:97
[ 25.821063] in_atomic(): 1, irqs_disabled(): 0, pid: 2113, name:
qemu-system-x86
[ 25.821066] CPU: 0 PID: 2113 Comm: qemu-system-x86 Not tainted 4.1.0+ #88
[ 25.821067] Hardware name: Dell Inc. Dell System XPS
15Z/00WW5M, BIOS A12 09/07/2012
[ 25.821068] 0000000000000061 ffff88021339bcd8 ffffffff816b8c81
0000000000000007
[ 25.821070] ffff880231159d40 ffff88021339bcf8 ffffffff8107d163
ffff88021339bd18
[ 25.821072] ffffffff81a451bc ffff88021339bd28 ffffffff8107d1ed
ffff8802133a0000
[ 25.821073] Call Trace:
[ 25.821078] [<ffffffff816b8c81>] dump_stack+0x4c/0x65
[ 25.821081] [<ffffffff8107d163>] ___might_sleep+0xd3/0x110
[ 25.821083] [<ffffffff8107d1ed>] __might_sleep+0x4d/0x90
[ 25.821085] [<ffffffff816bde74>] mutex_lock+0x24/0x50
[ 25.821087] [<ffffffff81141ef7>] static_key_slow_inc+0x57/0xc0
[ 25.821089] [<ffffffff8107cafd>] preempt_notifier_register+0x1d/0x60
[ 25.821099] [<ffffffffa04f11fd>] vcpu_load+0x3d/0x70 [kvm]
[ 25.821108] [<ffffffffa050699e>] kvm_arch_vcpu_setup+0x1e/0x50 [kvm]
[ 25.821115] [<ffffffffa05066e1>] ? kvm_arch_vcpu_create+0x51/0x70 [kvm]
[ 25.821120] [<ffffffffa04f29b2>] kvm_vm_ioctl+0x1d2/0x7a0 [kvm]
[ 25.821123] [<ffffffff811b7881>] do_vfs_ioctl+0x301/0x550
[ 25.821124] [<ffffffff811b7b49>] SyS_ioctl+0x79/0x90
[ 25.821127] [<ffffffff816c0257>] entry_SYSCALL_64_fastpath+0x12/0x6a
The offending commit is
commit 1cde2930e15473cb4dd7e5a07d83e605a969bd6e
Author: Peter Zijlstra <peterz@infradead.org>
Date: Mon Jun 8 16:00:30 2015 +0200
sched/preempt: Add static_key() to preempt_notifiers
BR,
Pontus Fuchs
next reply other threads:[~2015-06-25 12:00 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-25 12:00 Pontus Fuchs [this message]
2015-06-25 12:09 ` Regression: sched/preempt: Add static_key() to preempt_notifiers breaks my KVM Peter Zijlstra
2015-06-25 12:15 ` Pontus Fuchs
2015-06-25 12:55 ` [PATCH] sched,kvm: Fix KVM preempt_notifier usage Peter Zijlstra
2015-06-30 11:10 ` [tip:sched/urgent] sched/preempt, kvm: " tip-bot for Peter Zijlstra
2015-07-03 11:23 ` Paolo Bonzini
2015-07-03 11:12 ` [PATCH] sched,kvm: " Paolo Bonzini
2015-07-03 12:19 ` Peter Zijlstra
2015-07-03 12:31 ` Paolo Bonzini
2015-07-03 13:17 ` Peter Zijlstra
2015-07-03 15:16 ` Peter Zijlstra
2015-07-03 15:26 ` Paolo Bonzini
2015-07-03 15:38 ` Paolo Bonzini
2015-07-03 15:42 ` Peter Zijlstra
2015-07-03 15:46 ` Paolo Bonzini
2015-07-03 15:57 ` Takashi Iwai
2015-06-30 13:47 ` Regression: sched/preempt: Add static_key() to preempt_notifiers breaks my KVM Josh Boyer
2015-07-01 6:55 ` Ingo Molnar
2015-07-03 13:15 ` Takashi Iwai
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