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Subjectoprofile + hibernation = badness
Hi,

I'm probably crazy to do it, but...

$ opcontrol --start
$ echo disk > /sys/power/state

...leads to lots of badness/strangeness. First, lots of APIC errors:

APIC error on CPU0: 40(40)
[repeat 8 times]
APIC error on CPU1: 40(40)
APIC error on CPU1: 40(40)
APIC error on CPU0: 40(40)

These keep on coming all through the suspend/shutdown sequence, also
intermixing with other messages. I'm guessing oprofile is trying to
NMI CPUs that have been brought down?

Now I get some ACPI Exceptions, but I think that these are unrelated
to starting oprofile, because I have seen them on regular shutdowns as
well:

PM: Syncing filesystems ... done.
Freezing user space processes ... (elapsed 0.00 seconds) done.
Freezing remaining freezable tasks ... (elapsed 0.00 seconds) done.
PM: Shrinking memory... done (0 pages freed)
PM: Freed 0 kbytes in 0.44 seconds (0.00 MB/s)
Suspending console(s) (use no_console_suspend to debug)
ACPI Exception (exoparg2-0444): AE_AML_PACKAGE_LIMIT, Index
(000000007) is beyond end of object [20080609]
ACPI Error (psparse-0530): Method parse/execution failed
[\_SB_.PCI0.IDE0.GTM_] (Node f783bfc0), AE_AML_PACKAGE_LIMIT
ACPI Error (psparse-0530): Method parse/execution failed
[\_SB_.PCI0.IDE0.CHN0._GTM] (Node f783bb40), AE_AML_PACKAGE_LIMIT
ACPI handle has no context!
serial 00:0d: disabled
serial 00:06: disabled
ehci_hcd 0000:00:1d.7: PCI INT A disabled
uhci_hcd 0000:00:1d.3: PCI INT D disabled
uhci_hcd 0000:00:1d.2: PCI INT C disabled
uhci_hcd 0000:00:1d.1: PCI INT B disabled
uhci_hcd 0000:00:1d.0: PCI INT A disabled
ACPI: Preparing to enter system sleep state S4

After that, I see the message "WQ on CPU0, prefer CPU1" a few times.
This must also be bad.

Now some warnings:

------------[ cut here ]------------
WARNING: at /uio/arkimedes/s29/vegardno/git-working/linux-2.6/kernel/smp.c:328 s
mp_call_function_mask+0x194/0x1a0()
Pid: 3711, comm: bash Not tainted 2.6.27-rc3-00415-g122c9e0 #10
[<c013584f>] warn_on_slowpath+0x4f/0x80
[<c0585ff8>] ? log_sample+0xa8/0xc0
[<c03e4e8d>] ? device_power_down+0x5d/0x110
[<c0586140>] ? oprofile_add_ext_sample+0x40/0xc0
[<c05861f4>] ? oprofile_add_sample+0x34/0x50
[<c0588f5c>] ? p4_check_ctr+0x13c/0x160
[<c0160c54>] smp_call_function_mask+0x194/0x1a0
[<c0587940>] ? nmi_cpu_stop+0x0/0x30
[<c014e04c>] ? __atomic_notifier_call_chain+0x3c/0x50
[<c014e07a>] ? atomic_notifier_call_chain+0x1a/0x20
[<c014e0ad>] ? notify_die+0x2d/0x30
[<c0587940>] ? nmi_cpu_stop+0x0/0x30
[<c0160c90>] smp_call_function+0x30/0x60
[<c0587940>] ? nmi_cpu_stop+0x0/0x30
[<c013a16c>] on_each_cpu+0x2c/0x80
[<c05878d4>] nmi_stop+0x14/0x20
[<c05878f5>] nmi_suspend+0x15/0x20
[<c03dff63>] sysdev_suspend+0xa3/0x1f0
[<c03e4f0c>] device_power_down+0xdc/0x110
[<c016355b>] hibernation_snapshot+0x15b/0x220
[<c013644b>] ? printk+0x1b/0x20
[<c0162742>] ? freeze_processes+0x52/0xa0
[<c0163700>] hibernate+0xe0/0x180
[<c01621b0>] ? state_store+0x0/0xd0
[<c016226f>] state_store+0xbf/0xd0
[<c01621b0>] ? state_store+0x0/0xd0
[<c03618d4>] kobj_attr_store+0x24/0x30
[<c01e66c2>] sysfs_write_file+0xa2/0x100
[<c01a85b6>] vfs_write+0x96/0x130
[<c01e6620>] ? sysfs_write_file+0x0/0x100
[<c01a8afd>] sys_write+0x3d/0x70
[<c01040db>] sysenter_do_call+0x12/0x3f
[<c0670000>] ? _read_unlock_irqrestore+0x60/0x70
=======================
---[ end trace df36f449a70f1c8e ]---
PM: Creating hibernation image:
PM: Need to copy 54048 pages
PM: Hibernation image created (54048 pages copied)
x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
Intel machine check architecture supported.
BUG: using smp_processor_id() in preemptible [00000000] code: bash/3711
caller is intel_p4_mcheck_init+0xb9/0x2b0
Pid: 3711, comm: bash Tainted: G W 2.6.27-rc3-00415-g122c9e0 #10
[<c037664e>] debug_smp_processor_id+0xce/0xd0
[<c010e919>] intel_p4_mcheck_init+0xb9/0x2b0
[<c010dcd9>] mcheck_init+0x59/0x80
[<c0589636>] restore_processor_state+0x1f6/0x230
[<c01635d1>] hibernation_snapshot+0x1d1/0x220
[<c013644b>] ? printk+0x1b/0x20
[<c0162742>] ? freeze_processes+0x52/0xa0
[<c0163700>] hibernate+0xe0/0x180
[<c01621b0>] ? state_store+0x0/0xd0
[<c016226f>] state_store+0xbf/0xd0
[<c01621b0>] ? state_store+0x0/0xd0
[<c03618d4>] kobj_attr_store+0x24/0x30
[<c01e66c2>] sysfs_write_file+0xa2/0x100
[<c01a85b6>] vfs_write+0x96/0x130
[<c01e6620>] ? sysfs_write_file+0x0/0x100
[<c01a8afd>] sys_write+0x3d/0x70
[<c01040db>] sysenter_do_call+0x12/0x3f
[<c0670000>] ? _read_unlock_irqrestore+0x60/0x70
=======================
Intel machine check reporting enabled on CPU#0.
BUG: using smp_processor_id() in preemptible [00000000] code: bash/3711
caller is intel_p4_mcheck_init+0x100/0x2b0
Pid: 3711, comm: bash Tainted: G W 2.6.27-rc3-00415-g122c9e0 #10
[<c037664e>] debug_smp_processor_id+0xce/0xd0
[<c010e960>] intel_p4_mcheck_init+0x100/0x2b0
[<c010dcd9>] mcheck_init+0x59/0x80
[<c0589636>] restore_processor_state+0x1f6/0x230
[<c01635d1>] hibernation_snapshot+0x1d1/0x220
[<c013644b>] ? printk+0x1b/0x20
[<c0162742>] ? freeze_processes+0x52/0xa0
[<c0163700>] hibernate+0xe0/0x180
[<c01621b0>] ? state_store+0x0/0xd0
[<c016226f>] state_store+0xbf/0xd0
[<c01621b0>] ? state_store+0x0/0xd0
[<c03618d4>] kobj_attr_store+0x24/0x30
[<c01e66c2>] sysfs_write_file+0xa2/0x100
[<c01a85b6>] vfs_write+0x96/0x130
[<c01e6620>] ? sysfs_write_file+0x0/0x100
[<c01a8afd>] sys_write+0x3d/0x70
[<c01040db>] sysenter_do_call+0x12/0x3f
[<c0670000>] ? _read_unlock_irqrestore+0x60/0x70
=======================
CPU0: Intel P4/Xeon Extended MCE MSRs (24) available
BUG: using smp_processor_id() in preemptible [00000000] code: bash/3711
caller is intel_p4_mcheck_init+0x119/0x2b0
Pid: 3711, comm: bash Tainted: G W 2.6.27-rc3-00415-g122c9e0 #10
[<c037664e>] debug_smp_processor_id+0xce/0xd0
[<c010e979>] intel_p4_mcheck_init+0x119/0x2b0
[<c010dcd9>] mcheck_init+0x59/0x80
[<c0589636>] restore_processor_state+0x1f6/0x230
[<c01635d1>] hibernation_snapshot+0x1d1/0x220
[<c013644b>] ? printk+0x1b/0x20
[<c0162742>] ? freeze_processes+0x52/0xa0
[<c0163700>] hibernate+0xe0/0x180
[<c01621b0>] ? state_store+0x0/0xd0
[<c016226f>] state_store+0xbf/0xd0
[<c01621b0>] ? state_store+0x0/0xd0
[<c03618d4>] kobj_attr_store+0x24/0x30
[<c01e66c2>] sysfs_write_file+0xa2/0x100
[<c01a85b6>] vfs_write+0x96/0x130
[<c01e6620>] ? sysfs_write_file+0x0/0x100
[<c01a8afd>] sys_write+0x3d/0x70
[<c01040db>] sysenter_do_call+0x12/0x3f
[<c0670000>] ? _read_unlock_irqrestore+0x60/0x70
=======================
CPU0: Thermal monitoring enabled
Force enabled HPET at resume
BUG: using smp_processor_id() in preemptible [00000000] code: bash/3711
caller is retrigger_next_event+0x15/0xb0
Pid: 3711, comm: bash Tainted: G W 2.6.27-rc3-00415-g122c9e0 #10
[<c037664e>] debug_smp_processor_id+0xce/0xd0
[<c014c6c5>] retrigger_next_event+0x15/0xb0
[<c066d3bf>] ? preempt_schedule+0x3f/0x50
[<c066fe1c>] ? _spin_unlock+0x3c/0x50
[<c014c76a>] hres_timers_resume+0xa/0x10
[<c01509bc>] timekeeping_resume+0x12c/0x180
[<c03df894>] __sysdev_resume+0x14/0x50
[<c03dfdae>] sysdev_resume+0x3e/0x80
[<c03e4f4b>] device_power_up+0xb/0x20
[<c01635b0>] hibernation_snapshot+0x1b0/0x220
[<c013644b>] ? printk+0x1b/0x20
[<c0162742>] ? freeze_processes+0x52/0xa0
[<c0163700>] hibernate+0xe0/0x180
[<c01621b0>] ? state_store+0x0/0xd0
[<c016226f>] state_store+0xbf/0xd0
[<c01621b0>] ? state_store+0x0/0xd0
[<c03618d4>] kobj_attr_store+0x24/0x30
[<c01e66c2>] sysfs_write_file+0xa2/0x100
[<c01a85b6>] vfs_write+0x96/0x130
[<c01e6620>] ? sysfs_write_file+0x0/0x100
[<c01a8afd>] sys_write+0x3d/0x70
[<c01040db>] sysenter_do_call+0x12/0x3f
[<c0670000>] ? _read_unlock_irqrestore+0x60/0x70
=======================
Enabling non-boot CPUs ...

...and then, while writing the image, it looks something like this:

APIC error on CPU1: 40(40)
^H^H^H^H 3%<7>APIC error on CPU1: 40(40)
WQ on CPU0, prefer CPU1
APIC error on CPU1: 40(40)
[8 times]
APIC error on CPU1: 40(40)
WQ on CPU0, prefer CPU1
...

The machine comes back with this spamming the logs (rate of about 2 KB/sec):

WQ on CPU0, prefer CPU1
APIC error on CPU1: 40(40)
[9 times, repeat]

I can still log in with ssh and reboot the machine, which finally
gives this warning:

BUG: sleeping function called from invalid context at kernel/sched.c:4625
in_atomic():1, irqs_disabled():0
INFO: lockdep is turned off.
Pid: 4027, comm: oprofiled Tainted: G W 2.6.27-rc3-00415-g122c9e0 #10
[<c012c98e>] __might_sleep+0xee/0x140
[<c066c8d8>] wait_for_common+0x28/0x130
[<c01595bb>] ? trace_hardirqs_on+0xb/0x10
[<c066ff13>] ? _spin_unlock_irqrestore+0x43/0x70
[<c066ca72>] wait_for_completion+0x12/0x20
[<c014715d>] synchronize_rcu+0x2d/0x40
[<c01471f0>] ? wakeme_after_rcu+0x0/0x10
[<c01595bb>] ? trace_hardirqs_on+0xb/0x10
[<c014e156>] atomic_notifier_chain_unregister+0x36/0x50
[<c014e17f>] unregister_die_notifier+0xf/0x20
[<c0587b84>] nmi_shutdown+0x44/0x80
[<c0585d4a>] oprofile_shutdown+0x2a/0x60
[<c0586b50>] event_buffer_release+0x10/0x40
[<c01a8f26>] __fput+0xb6/0x180
[<c01a92a9>] fput+0x19/0x20
[<c01a63c7>] filp_close+0x47/0x70
[<c013741b>] put_files_struct+0x9b/0xb0
[<c0137472>] exit_files+0x42/0x60
[<c01386a2>] do_exit+0x192/0x880
[<c014d3b6>] ? up_read+0x16/0x30
[<c0120493>] ? do_page_fault+0x2e3/0x700
[<c01a7cc0>] ? do_sync_write+0x0/0x110
[<c0138dc1>] do_group_exit+0x31/0x90
[<c0138e2f>] sys_exit_group+0xf/0x20
[<c01040db>] sysenter_do_call+0x12/0x3f
=======================
Sending all processes the KILL signal...

The last time I did this, the machine also came up with a corrupt ext3
root filesystem. But it didn't happen this time, so I guess it could
also be unrelated.

What would be the proper way to fix all this? Should oprofile be able
to profile the suspend/resume code as well? Or should "echo disk" give
-EBUSY if oprofile is running? Or
do we simply insert a huge kludge in the form of mutual exclusion
between oprofile and suspend in the Kconfig?

Thanks,


Vegard

PS: This is not a regression. It's probably always been like that.

--
"The animistic metaphor of the bug that maliciously sneaked in while
the programmer was not looking is intellectually dishonest as it
disguises that the error is the programmer's own creation."
-- E. W. Dijkstra, EWD1036


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