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SubjectINFO: possible circular locking in the resume
Hi

I'm getting this INFO: from suspend/resume process.
(Kernel uses patches from this bugzilla to survive suspend
http://bugzilla.kernel.org/show_bug.cgi?id=10030)
(Config is available in the bugzilla)


[ 42.097522] MMC: killing requests for dead queue
[ 42.098738] PM: Finishing wakeup.
[ 42.098740] Restarting tasks ... <6>usb 3-2: USB disconnect, address 2
[ 42.129810] done.
[ 42.258523]
[ 42.258524] =======================================================
[ 42.258626] [ INFO: possible circular locking dependency detected ]
[ 42.258681] 2.6.25-rc3 #81
[ 42.258736] -------------------------------------------------------
[ 42.258787] sh/1973 is trying to acquire lock:
[ 42.258839] (&cpu_hotplug.lock){--..}, at: [<ffffffff8106d7a5>]
get_online_cpus+0x35/0x50
[ 42.259068]
[ 42.259068] but task is already holding lock:
[ 42.259166] (&sp->mutex){--..}, at: [<ffffffff8105adb0>]
synchronize_srcu+0x20/0x90
[ 42.259376]
[ 42.259377] which lock already depends on the new lock.
[ 42.259377]
[ 42.259501]
[ 42.259501] the existing dependency chain (in reverse order) is:
[ 42.259501]
[ 42.259501] -> #3 (&sp->mutex){--..}:
[ 42.259501] [<ffffffff81066d30>] __lock_acquire+0xfb0/0x1040
[ 42.259501] [<ffffffff81066e68>] lock_acquire+0xa8/0xf0
[ 42.259501] [<ffffffff812ef5ac>] mutex_lock_nested+0xcc/0x370
[ 42.259501] [<ffffffff8105adb0>] synchronize_srcu+0x20/0x90
[ 42.259501] [<ffffffff8105b2b4>]
srcu_notifier_chain_unregister+0x74/0xe0
[ 42.259501] [<ffffffff8125a337>] cpufreq_unregister_notifier+0x17/0x40
[ 42.259501] [<ffffffff8829e296>]
cpufreq_governor_userspace+0x1b6/0x1f4 [cpufreq_userspace]
[ 42.259501] [<ffffffff81259923>] __cpufreq_governor+0xd3/0x150
[ 42.259501] [<ffffffff8125a0b5>] __cpufreq_set_policy+0x115/0x170
[ 42.259501] [<ffffffff8125a819>] store_scaling_governor+0xc9/0x260
[ 42.259501] [<ffffffff8125b527>] store+0x87/0xa0
[ 42.259501] [<ffffffff811101fa>] sysfs_write_file+0xca/0x140
[ 42.259501] [<ffffffff810bb82b>] vfs_write+0xcb/0x170
[ 42.259501] [<ffffffff810bb9c0>] sys_write+0x50/0x90
[ 42.259501] [<ffffffff8100c70a>] system_call_after_swapgs+0x8a/0x8f
[ 42.259501] [<ffffffffffffffff>] 0xffffffffffffffff
[ 42.259501]
[ 42.259501] -> #2 (userspace_mutex){--..}:
[ 42.259501] [<ffffffff81066d30>] __lock_acquire+0xfb0/0x1040
[ 42.259501] [<ffffffff81066e68>] lock_acquire+0xa8/0xf0
[ 42.259501] [<ffffffff812ef5ac>] mutex_lock_nested+0xcc/0x370
[ 42.259501] [<ffffffff8829e13c>]
cpufreq_governor_userspace+0x5c/0x1f4 [cpufreq_userspace]
[ 42.259501] [<ffffffff81259923>] __cpufreq_governor+0xd3/0x150
[ 42.259501] [<ffffffff8125a0cb>] __cpufreq_set_policy+0x12b/0x170
[ 42.259501] [<ffffffff8125a819>] store_scaling_governor+0xc9/0x260
[ 42.259501] [<ffffffff8125b527>] store+0x87/0xa0
[ 42.259501] [<ffffffff811101fa>] sysfs_write_file+0xca/0x140
[ 42.259501] [<ffffffff810bb82b>] vfs_write+0xcb/0x170
[ 42.259501] [<ffffffff810bb9c0>] sys_write+0x50/0x90
[ 42.259501] [<ffffffff8100c70a>] system_call_after_swapgs+0x8a/0x8f
[ 42.259501] [<ffffffffffffffff>] 0xffffffffffffffff
[ 42.259501]
[ 42.259501] -> #1 (&per_cpu(cpu_policy_rwsem, cpu)){----}:
[ 42.259501] [<ffffffff81066d30>] __lock_acquire+0xfb0/0x1040
[ 42.259501] [<ffffffff81066e68>] lock_acquire+0xa8/0xf0
[ 42.259501] [<ffffffff812effc8>] down_write+0x38/0x70
[ 42.259501] [<ffffffff8125ae7c>] lock_policy_rwsem_write+0x4c/0x90
[ 42.259501] [<ffffffff812edbed>] cpufreq_cpu_callback+0x6d/0x90
[ 42.259501] [<ffffffff812f578f>] notifier_call_chain+0x3f/0x80
[ 42.259501] [<ffffffff8105b059>] __raw_notifier_call_chain+0x9/0x10
[ 42.259501] [<ffffffff8106d368>] _cpu_down+0xa8/0x290
[ 42.259501] [<ffffffff8106d621>] disable_nonboot_cpus+0x71/0x110
[ 42.259501] [<ffffffff810730d5>] suspend_devices_and_enter+0xe5/0x1a0
[ 42.259501] [<ffffffff81073306>] enter_state+0x146/0x1d0
[ 42.259501] [<ffffffff8107344a>] state_store+0xba/0x100
[ 42.259501] [<ffffffff811757f7>] kobj_attr_store+0x17/0x20
[ 42.259501] [<ffffffff811101fa>] sysfs_write_file+0xca/0x140
[ 42.259501] [<ffffffff810bb82b>] vfs_write+0xcb/0x170
[ 42.259501] [<ffffffff810bb9c0>] sys_write+0x50/0x90
[ 42.259501] [<ffffffff8100c70a>] system_call_after_swapgs+0x8a/0x8f
[ 42.259501] [<ffffffffffffffff>] 0xffffffffffffffff
[ 42.259501]
[ 42.259501] -> #0 (&cpu_hotplug.lock){--..}:
[ 42.259501] [<ffffffff81066c3d>] __lock_acquire+0xebd/0x1040
[ 42.259501] [<ffffffff81066e68>] lock_acquire+0xa8/0xf0
[ 42.259501] [<ffffffff812ef5ac>] mutex_lock_nested+0xcc/0x370
[ 42.259501] [<ffffffff8106d7a5>] get_online_cpus+0x35/0x50
[ 42.259501] [<ffffffff8103837e>] sched_getaffinity+0x1e/0xa0
[ 42.259501] [<ffffffff8108b386>] __synchronize_sched+0x16/0x90
[ 42.259501] [<ffffffff8105add5>] synchronize_srcu+0x45/0x90
[ 42.259501] [<ffffffff8105b2b4>]
srcu_notifier_chain_unregister+0x74/0xe0
[ 42.259501] [<ffffffff8125a337>] cpufreq_unregister_notifier+0x17/0x40
[ 42.259501] [<ffffffff8829e296>]
cpufreq_governor_userspace+0x1b6/0x1f4 [cpufreq_userspace]
[ 42.259501] [<ffffffff81259923>] __cpufreq_governor+0xd3/0x150
[ 42.259501] [<ffffffff8125a0b5>] __cpufreq_set_policy+0x115/0x170
[ 42.259501] [<ffffffff8125a819>] store_scaling_governor+0xc9/0x260
[ 42.259501] [<ffffffff8125b527>] store+0x87/0xa0
[ 42.259501] [<ffffffff811101fa>] sysfs_write_file+0xca/0x140
[ 42.259501] [<ffffffff810bb82b>] vfs_write+0xcb/0x170
[ 42.259501] [<ffffffff810bb9c0>] sys_write+0x50/0x90
[ 42.259501] [<ffffffff8100c70a>] system_call_after_swapgs+0x8a/0x8f
[ 42.259501] [<ffffffffffffffff>] 0xffffffffffffffff
[ 42.259501]
[ 42.259501] other info that might help us debug this:
[ 42.259501]
[ 42.259501] 4 locks held by sh/1973:
[ 42.259501] #0: (&buffer->mutex){--..}, at: [<ffffffff81110173>]
sysfs_write_file+0x43/0x140
[ 42.259501] #1: (&per_cpu(cpu_policy_rwsem, cpu)){----}, at:
[<ffffffff8125ae7c>] lock_policy_rwsem_write+0x4c/0x90
[ 42.259501] #2: (userspace_mutex){--..}, at: [<ffffffff8829e22e>]
cpufreq_governor_userspace+0x14e/0x1f4 [cpufreq_userspace]
[ 42.259501] #3: (&sp->mutex){--..}, at: [<ffffffff8105adb0>]
synchronize_srcu+0x20/0x90
[ 42.259501]
[ 42.259501] stack backtrace:
[ 42.259501] Pid: 1973, comm: sh Not tainted 2.6.25-rc3 #81
[ 42.259501]
[ 42.259501] Call Trace:
[ 42.259501] [<ffffffff81065ac4>] print_circular_bug_tail+0x84/0x90
[ 42.259501] [<ffffffff81065872>] ? print_circular_bug_entry+0x52/0x60
[ 42.259501] [<ffffffff81066c3d>] __lock_acquire+0xebd/0x1040
[ 42.259501] [<ffffffff8106353b>] ? find_usage_backwards+0xcb/0x110
[ 42.259502] [<ffffffff8106353b>] ? find_usage_backwards+0xcb/0x110
[ 42.259502] [<ffffffff8106d7a5>] ? get_online_cpus+0x35/0x50
[ 42.259502] [<ffffffff81066e68>] lock_acquire+0xa8/0xf0
[ 42.259502] [<ffffffff8106d7a5>] ? get_online_cpus+0x35/0x50
[ 42.259502] [<ffffffff812ef5ac>] mutex_lock_nested+0xcc/0x370
[ 42.259502] [<ffffffff8106d7a5>] ? get_online_cpus+0x35/0x50
[ 42.259502] [<ffffffff81065649>] ? trace_hardirqs_on+0x139/0x1a0
[ 42.259502] [<ffffffff8106d7a5>] get_online_cpus+0x35/0x50
[ 42.259502] [<ffffffff8103837e>] sched_getaffinity+0x1e/0xa0
[ 42.259502] [<ffffffff8108b386>] __synchronize_sched+0x16/0x90
[ 42.259502] [<ffffffff8105add5>] synchronize_srcu+0x45/0x90
[ 42.259502] [<ffffffff8105b2b4>] srcu_notifier_chain_unregister+0x74/0xe0
[ 42.259502] [<ffffffff8125a337>] cpufreq_unregister_notifier+0x17/0x40
[ 42.259502] [<ffffffff8829e296>]
:cpufreq_userspace:cpufreq_governor_userspace+0x1b6/0x1f4
[ 42.259502] [<ffffffff81259923>] __cpufreq_governor+0xd3/0x150
[ 42.259502] [<ffffffff8125a0b5>] __cpufreq_set_policy+0x115/0x170
[ 42.259502] [<ffffffff8125a819>] store_scaling_governor+0xc9/0x260
[ 42.259502] [<ffffffff8125b650>] ? handle_update+0x0/0x10
[ 42.259502] [<ffffffff812efff0>] ? down_write+0x60/0x70
[ 42.259502] [<ffffffff8125b527>] store+0x87/0xa0
[ 42.259502] [<ffffffff811101fa>] sysfs_write_file+0xca/0x140
[ 42.259502] [<ffffffff810bb82b>] vfs_write+0xcb/0x170
[ 42.259502] [<ffffffff810bb9c0>] sys_write+0x50/0x90
[ 42.259502] [<ffffffff8100c70a>] system_call_after_swapgs+0x8a/0x8f
[ 42.259502]
[ 41.439840] mmc0: new SD card at address 5a61
[ 41.440027] mmcblk0: mmc0:5a61 S016B 14560KiB
[ 41.440123] mmcblk0: p1
[ 41.916006] usb 3-2: new full speed USB device using uhci_hcd and address 3
[ 42.900716] usb 3-2: configuration #1 chosen from 1 choice
[ 42.080814] usb 3-2: New USB device found, idVendor=0483, idProduct=2016
[ 42.080939] usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 42.081094] usb 3-2: Product: Biometric Coprocessor
[ 42.081212] usb 3-2: Manufacturer: STMicroelectronics
[ 47.925651] PM: Syncing filesystems ... done.
[ 47.925845] PM: Preparing system for mem sleep
[ 47.925925] Freezing user space processes ... (elapsed 0.00 seconds) done.
[ 47.926302] Freezing remaining freezable tasks ... (elapsed 0.00
seconds) done.
[ 47.926596] PM: Entering mem sleep
[ 47.929993] ACPI: Preparing to enter system sleep state S3
[ 49.169572] sd 0:0:0:0: [sda] Synchronizing SCSI cache
[ 49.169771] sd 0:0:0:0: [sda] Stopping disk
[ 51.204365] mmc0: card 5a61 removed
[ 51.204365] ACPI handle has no context!
[ 51.204365] ACPI: PCI interrupt for device 0000:15:00.2 disabled
[ 51.204365] ACPI handle has no context!

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