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Date: Sun, 20 Mar 2016 11:20:38 +0100
From: Borislav Petkov <bp@alien8.de>
To: kvm ML <kvm@vger.kernel.org>
Cc: linux-kernel@vger.kernel.org
Subject: kvm on 4.5.0+: trying to register non-static key.
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Hi guys,

I'm seeing this on latest Linus (top commit 1e75a9f34a5e ("Merge
git://www.linux-watchdog.org/linux-watchdog")):

...
[   14.124256] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[  284.440294] INFO: trying to register non-static key.
[  284.445259] the code is fine but needs lockdep annotation.
[  284.450736] turning off the locking correctness validator.
[  284.456215] CPU: 5 PID: 3843 Comm: qemu-system-x86 Not tainted 4.5.0+ #1
[  284.462913] Hardware name: To be filled by O.E.M. To be filled by O.E.M./M5A97 EVO R2.0, BIOS 1503 01/16/2013
[  284.472809]  0000000000000000 ffff8804132a3cb0 ffffffff812f30f3 ffff880427f15f00
[  284.480261]  0000000000000000 ffff8804132a3d70 ffffffff810adb5a ffff880427f15f00
[  284.487715]  ffffffff81713ca6 0000000000000246 ffff880400000000 ffff880400000000
[  284.495178] Call Trace:
[  284.497625]  [<ffffffff812f30f3>] dump_stack+0x67/0x94
[  284.502762]  [<ffffffff810adb5a>] __lock_acquire+0x1b8a/0x2150
[  284.508587]  [<ffffffff81713ca6>] ? __mutex_unlock_slowpath+0x106/0x1b0
[  284.515198]  [<ffffffff810abbd2>] ? trace_hardirqs_on_caller+0xf2/0x210
[  284.521802]  [<ffffffff81713c8f>] ? __mutex_unlock_slowpath+0xef/0x1b0
[  284.528318]  [<ffffffff810aecc3>] lock_acquire+0xd3/0x240
[  284.533733]  [<ffffffffa0305aa0>] ? kvm_page_track_register_notifier+0x20/0x60 [kvm]
[  284.541467]  [<ffffffff81715581>] _raw_spin_lock+0x41/0x80
[  284.546960]  [<ffffffffa0305aa0>] ? kvm_page_track_register_notifier+0x20/0x60 [kvm]
[  284.554707]  [<ffffffffa0305aa0>] kvm_page_track_register_notifier+0x20/0x60 [kvm]
[  284.562281]  [<ffffffffa02ece70>] kvm_mmu_init_vm+0x20/0x30 [kvm]
[  284.568381]  [<ffffffffa02dbf7a>] kvm_arch_init_vm+0x1ea/0x200 [kvm]
[  284.574740]  [<ffffffffa02bff3f>] kvm_dev_ioctl+0xbf/0x4d0 [kvm]
[  284.580743]  [<ffffffff811b2dac>] do_vfs_ioctl+0x9c/0x680
[  284.586132]  [<ffffffff811bf109>] ? __fget_light+0x29/0x90
[  284.591609]  [<ffffffff811b33dc>] SyS_ioctl+0x4c/0x90
[  284.596653]  [<ffffffff817164a9>] entry_SYSCALL_64_fastpath+0x1c/0xac
[  284.603085]  [<ffffffff8171645a>] ? entry_SYSCALL_64_after_swapgs+0x17/0x4a
[  284.610036]  [<ffffffff813201f3>] ? __this_cpu_preempt_check+0x13/0x20
[  285.126012] kvm: zapping shadow pages for mmio generation wraparound
[  285.136787] kvm: zapping shadow pages for mmio generation wraparound
[  321.479149] kvm: zapping shadow pages for mmio generation wraparound
[  321.489990] kvm: zapping shadow pages for mmio generation wraparound
[  393.824394] kvm: zapping shadow pages for mmio generation wraparound
[  393.834995] kvm: zapping shadow pages for mmio generation wraparound

>>From a quick look, that

	spin_lock(&kvm->mmu_lock);

in kvm_page_track_register_notifier() is done on a dynamically allocated
struct kvm * by kvm_arch_alloc_vm()...

-- 
Regards/Gruss,
    Boris.

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