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Message-ID: <20150827115914.GA2258@milliways> Date: Thu, 27 Aug 2015 12:59:14 +0100 From: Ken Moffat <zarniwhoop@...world.com> To: linux-kernel@...r.kernel.org Cc: qemu-devel@...gnu.org Subject: Re: Lockups with 4.2-rc kernels and qemu On Tue, Aug 25, 2015 at 12:40:15AM +0100, Ken Moffat wrote: > (Cc'ing qemu-devel, please keep me in the Cc). > > TL;DR - qemu locks up my machine when I use 4.2-rc kernels. > Previous mail, or at least the copy to qemu, archived at https://lists.gnu.org/archive/html/qemu-devel/2015-08/msg02784.html I started bisecting, but it is going to be a slow business - kernels which seem to be ok after e.g. 3 hours can still lock the box. I left it running overnight, and this morning it was still up - but firefox could no longer connect externally. I eventually tracked that to my logs taking the space. But one reason the logs had become so big was the following (found from this morning's restart): Aug 27 09:50:28 ac4tv kernel: [ 124.279813] BUG: scheduling while atomic: qemu-system-x86/1789/0x00000002 Aug 27 09:50:28 ac4tv kernel: [ 124.279819] Modules linked in: psmouse i2c_piix4 asus_atk0110 microcode k10temp Aug 27 09:50:28 ac4tv kernel: [ 124.279828] Preemption disabled at:[<ffffffff8100787c>] kvm_vcpu_ioctl+0x7c/0x580 Aug 27 09:50:28 ac4tv kernel: [ 124.279839] Aug 27 09:50:28 ac4tv kernel: [ 124.279842] CPU: 2 PID: 1789 Comm: qemu-system-x86 Not tainted 4.1.0-10762-g8c7febe #4 Aug 27 09:50:28 ac4tv kernel: [ 124.279843] Hardware name: System manufacturer System Product Name/M5A78L-M LX V2, BIOS 0601 11/30/2011 Aug 27 09:50:28 ac4tv kernel: [ 124.279845] ffff88021fd14880 ffff88020718fc38 ffffffff8178316e 0000000080000002 Aug 27 09:50:28 ac4tv kernel: [ 124.279847] 0000000000014880 ffff88020718fc48 ffffffff810b93d7 ffff88020718fca8 Aug 27 09:50:28 ac4tv kernel: [ 124.279849] ffffffff8178607c ffff88021fc14880 ffff880215ebc100 ffff88020718fc78 Aug 27 09:50:28 ac4tv kernel: [ 124.279851] Call Trace: Aug 27 09:50:28 ac4tv kernel: [ 124.279855] [<ffffffff8178316e>] dump_stack+0x4f/0x7b Aug 27 09:50:28 ac4tv kernel: [ 124.279859] [<ffffffff810b93d7>] __schedule_bug+0x57/0xa0 Aug 27 09:50:28 ac4tv kernel: [ 124.279861] [<ffffffff8178607c>] __schedule+0x67c/0x9d0 Aug 27 09:50:28 ac4tv kernel: [ 124.279864] [<ffffffff8178b008>] ? _raw_write_unlock_irqrestore+0x18/0x40 Aug 27 09:50:28 ac4tv kernel: [ 124.279865] [<ffffffff817864b1>] schedule+0x41/0x90 Aug 27 09:50:28 ac4tv kernel: [ 124.279867] [<ffffffff81786888>] schedule_preempt_disabled+0x18/0x30 Aug 27 09:50:28 ac4tv kernel: [ 124.279869] [<ffffffff81788f9d>] __mutex_lock_slowpath+0x10d/0x340 Aug 27 09:50:28 ac4tv kernel: [ 124.279871] [<ffffffff817891e6>] mutex_lock+0x16/0x30 Aug 27 09:50:28 ac4tv kernel: [ 124.279874] [<ffffffff8115c4c2>] static_key_slow_inc+0x42/0xc0 Aug 27 09:50:28 ac4tv kernel: [ 124.279875] [<ffffffff810b92dd>] preempt_notifier_register+0x1d/0x60 Aug 27 09:50:28 ac4tv kernel: [ 124.279881] [<ffffffff8100774d>] vcpu_load+0x4d/0x90 Aug 27 09:50:28 ac4tv kernel: [ 124.279887] [<ffffffff8100787c>] kvm_vcpu_ioctl+0x7c/0x580 Aug 27 09:50:28 ac4tv kernel: [ 124.279892] [<ffffffff8178af77>] ? _raw_write_unlock_irq+0x17/0x40 Aug 27 09:50:28 ac4tv kernel: [ 124.279898] [<ffffffff811bb445>] do_vfs_ioctl+0x295/0x480 Aug 27 09:50:28 ac4tv kernel: [ 124.279905] [<ffffffff811c5189>] ? __fget+0x79/0xb0 Aug 27 09:50:28 ac4tv kernel: [ 124.279910] [<ffffffff811bb67c>] SyS_ioctl+0x4c/0x90 Aug 27 09:50:28 ac4tv kernel: [ 124.279914] [<ffffffff8115cf23>] ? context_tracking_user_enter+0x13/0x20 Aug 27 09:50:28 ac4tv kernel: [ 124.279917] [<ffffffff8105c055>] ? syscall_trace_leave+0xa5/0x140 Aug 27 09:50:28 ac4tv kernel: [ 124.279919] [<ffffffff8178b657>] entry_SYSCALL_64_fastpath+0x12/0x6a Aug 27 09:50:28 ac4tv kernel: [ 124.477786] kvm: zapping shadow pages for mmio generation wraparound Aug 27 09:50:31 ac4tv kernel: [ 127.177303] BUG: scheduling while atomic: qemu-system-x86/1788/0x00000002 Aug 27 09:50:31 ac4tv kernel: [ 127.177309] Modules linked in: Aug 27 09:50:31 ac4tv kernel: [ 127.177317] BUG: scheduling while atomic: qemu-system-x86/1790/0x00000002 Aug 27 09:50:31 ac4tv kernel: [ 127.177318] psmouse i2c_piix4 asus_atk0110 microcode k10temp Aug 27 09:50:31 ac4tv kernel: [ 127.177332] Preemption disabled at: Aug 27 09:50:31 ac4tv kernel: [ 127.177334] Modules linked in: psmouse i2c_piix4 asus_atk0110 microcode k10temp Aug 27 09:50:31 ac4tv kernel: [ 127.177341] Preemption disabled at:[<ffffffff8100787c>] kvm_vcpu_ioctl+0x7c/0x580 etc, etc. I have not _noticed_ these messages on -rc8, but for the moment I am inclined to treat them as another sign of the same problem. Which means a fresh bisection. <sigh/> ĸen -- This one goes up to eleven: but only on a clear day, with the wind in the right direction. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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