Messages in this thread | | | Date | Thu, 25 Jun 2015 14:00:02 +0200 | From | Pontus Fuchs <> | Subject | Regression: sched/preempt: Add static_key() to preempt_notifiers breaks my KVM |
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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
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