Re: [Xen-devel] WARNings in guest during xl save/restore

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 11/21/2014 10:14 AM, Konrad Rzeszutek Wilk wrote:
> On Fri, Nov 21, 2014 at 11:08:37AM +0100, Juergen Gross wrote:
> > Hi,
> >
> > during tests of my "linear p2m list" patches I stumbled over some
> > WARNs issued during xl save and xl restore of a pv-domU with
> > unpatched linux 3.18-rc5:
> Boris had an patch for this I htink..

Right, I submitted a patch a while ago to disable APIC power management 
for PV but it didn't get anywhere (needed a response from x86 maintainers)
http://lists.xenproject.org/archives/html/xen-devel/2014-03/msg00153.html

Strangely enough, I don't remember seeing this error since then for some 
reason.
-boris


> > during save I saw multiple entries like:
> > [  176.900393] WARNING: CPU: 0 PID: 9 at arch/x86/xen/enlighten.c:968
> > clear_local_APIC+0xa5/0x2b0()
> > [  176.900393] Modules linked in: cfg80211 rfkill nfsd auth_rpcgss
> > oid_registry nfs_acl nfs lockd grace fscache sunrpc evdev
> > x86_pkg_temp_thermal thermal_sys snd_pcm coretemp snd_timer crc32_pclmul
> > aesni_intel snd xts soundcore aes_i586 lrw gf128mul ablk_helper pcspkr
> > cryptd fuse autofs4 ext4 crc16 mbcache jbd2 crc32c_intel
> > [  176.900393] CPU: 0 PID: 9 Comm: migration/0 Tainted: G        W
> > 3.18.0-rc5 #30
> > [  176.900393]  00000009 c14c40b2 00000000 c1054b10 c1599538 00000000
> > 00000009 c158bdc2
> > [  176.900393]  000003c8 c103c925 c103c925 000003c8 00000002 00000000
> > c15d25eb e8867e64
> > [  176.900393]  c1054bd9 00000009 00000000 c103c925 00000000 c103cb54
> > 00000002 00000000
> > [  176.900393] Call Trace:
> > [  176.900393]  [<c14c40b2>] ? dump_stack+0x3e/0x4e
> > [  176.900393]  [<c1054b10>] ? warn_slowpath_common+0x90/0xc0
> > [  176.900393]  [<c103c925>] ? clear_local_APIC+0xa5/0x2b0
> > [  176.900393]  [<c103c925>] ? clear_local_APIC+0xa5/0x2b0
> > [  176.900393]  [<c1054bd9>] ? warn_slowpath_null+0x19/0x20
> > [  176.900393]  [<c103c925>] ? clear_local_APIC+0xa5/0x2b0
> > [  176.900393]  [<c103cb54>] ? disable_local_APIC+0x24/0x90
> > [  176.900393]  [<c103ccde>] ? lapic_suspend+0x11e/0x170
> > [  176.900393]  [<c1360ff9>] ? syscore_suspend+0x79/0x220
> > [  176.900393]  [<c107e782>] ? set_next_entity+0x62/0x80
> > [  176.900393]  [<c13165cd>] ? xen_suspend+0x2d/0x110
> > [  176.900393]  [<c10045df>] ? xen_mc_flush+0x13f/0x170
> > [  176.900393]  [<c10d5619>] ? multi_cpu_stop+0xa9/0xd0
> > [  176.900393]  [<c10d5570>] ? cpu_stop_should_run+0x50/0x50
> > [  176.900393]  [<c10d5771>] ? cpu_stopper_thread+0x71/0x100
> > [  176.900393]  [<c1074214>] ? finish_task_switch+0x34/0xd0
> > [  176.900393]  [<c14c513d>] ? __schedule+0x23d/0x7f0
> > [  176.900393]  [<c10897f4>] ? __wake_up_common+0x44/0x70
> > [  176.900393]  [<c14c8962>] ? _raw_spin_lock_irqsave+0x12/0x60
> > [  176.900393]  [<c1071f22>] ? smpboot_thread_fn+0xd2/0x170
> > [  176.900393]  [<c1071e50>] ? SyS_setgroups+0x110/0x110
> > [  176.900393]  [<c106e801>] ? kthread+0xa1/0xc0
> > [  176.900393]  [<c14c8ea1>] ? ret_from_kernel_thread+0x21/0x30
> > [  176.900393]  [<c106e760>] ? kthread_create_on_node+0x120/0x120
> > [  176.900393] ---[ end trace b38596d5cfdcde8d ]---
> >
> > and during restore:
> > [  176.900393] WARNING: CPU: 0 PID: 9 at arch/x86/xen/enlighten.c:968
> > lapic_resume+0xc6/0x270()
> > [  176.900393] Modules linked in: cfg80211 rfkill nfsd auth_rpcgss
> > oid_registry nfs_acl nfs lockd grace fscache sunrpc evdev
> > x86_pkg_temp_thermal thermal_sys snd_pcm coretemp snd_timer crc32_pclmul
> > aesni_intel snd xts soundcore aes_i586 lrw gf128mul ablk_helper pcspkr
> > cryptd fuse autofs4 ext4 crc16 mbcache jbd2 crc32c_intel
> > [  176.900393] CPU: 0 PID: 9 Comm: migration/0 Tainted: G        W
> > 3.18.0-rc5 #30
> > [  176.900393]  00000009 c14c40b2 00000000 c1054b10 c1599538 00000000
> > 00000009 c158bdc2
> > [  176.900393]  000003c8 c103c1e6 c103c1e6 000003c8 c1030020 00000002
> > 0000001b 00000000
> > [  176.900393]  c1054bd9 00000009 00000000 c103c1e6 00000000 c16432c0
> > 0108cdfe c15d25dc
> > [  176.900393] Call Trace:
> > [  176.900393]  [<c14c40b2>] ? dump_stack+0x3e/0x4e
> > [  176.900393]  [<c1054b10>] ? warn_slowpath_common+0x90/0xc0
> > [  176.900393]  [<c103c1e6>] ? lapic_resume+0xc6/0x270
> > [  176.900393]  [<c103c1e6>] ? lapic_resume+0xc6/0x270
> > [  176.900393]  [<c1030020>] ? mcheck_cpu_init+0x170/0x4f0
> > [  176.900393]  [<c1054bd9>] ? warn_slowpath_null+0x19/0x20
> > [  176.900393]  [<c103c1e6>] ? lapic_resume+0xc6/0x270
> > [  176.900393]  [<c1360e66>] ? syscore_resume+0x46/0x160
> > [  176.900393]  [<c1009012>] ? xen_timer_resume+0x42/0x60
> > [  176.900393]  [<c131661c>] ? xen_suspend+0x7c/0x110
> > [  176.900393]  [<c10d5619>] ? multi_cpu_stop+0xa9/0xd0
> > [  176.900393]  [<c10d5570>] ? cpu_stop_should_run+0x50/0x50
> > [  176.900393]  [<c10d5771>] ? cpu_stopper_thread+0x71/0x100
> > [  176.900393]  [<c1074214>] ? finish_task_switch+0x34/0xd0
> > [  176.900393]  [<c14c513d>] ? __schedule+0x23d/0x7f0
> > [  176.900393]  [<c10897f4>] ? __wake_up_common+0x44/0x70
> > [  176.900393]  [<c14c8962>] ? _raw_spin_lock_irqsave+0x12/0x60
> > [  176.900393]  [<c1071f22>] ? smpboot_thread_fn+0xd2/0x170
> > [  176.900393]  [<c1071e50>] ? SyS_setgroups+0x110/0x110
> > [  176.900393]  [<c106e801>] ? kthread+0xa1/0xc0
> > [  176.900393]  [<c14c8ea1>] ? ret_from_kernel_thread+0x21/0x30
> > [  176.900393]  [<c106e760>] ? kthread_create_on_node+0x120/0x120
> > [  176.900393] ---[ end trace b38596d5cfdcde93 ]---
> >
> > While this seems not to be critical (the system is running after the
> > restore) I assume disabling/enabling a local APIC on a pv-domain isn't
> > something we want to happen...
> >
> >
> > Juergen
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxx
> > http://lists.xen.org/xen-devel

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