* [linux-next:master] [powercap] 42dde4365f: WARNING:possible_circular_locking_dependency_detected
@ 2026-03-30 7:52 kernel test robot
2026-03-30 12:06 ` Rafael J. Wysocki
0 siblings, 1 reply; 2+ messages in thread
From: kernel test robot @ 2026-03-30 7:52 UTC (permalink / raw)
To: Kuppuswamy Sathyanarayanan
Cc: oe-lkp, lkp, Rafael J. Wysocki, Zhang Rui, Srinivas Pandruvada,
linux-pm, oliver.sang
Hello,
kernel test robot noticed "WARNING:possible_circular_locking_dependency_detected" on:
commit: 42dde4365f89dce91bdc07fd1bca047d71dd162e ("powercap: intel_rapl: Register PM notifier only when RAPL package exists")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master
[test failed on linux-next/master 85964cdcad0fac9a0eb7b87a0f9d88cc074b854c]
in testcase: kernel-selftests
version: kernel-selftests-x86_64-9f2693489ef8-1_20260201
with following parameters:
group: breakpoints
config: x86_64-rhel-9.4-kselftests
compiler: gcc-14
test machine: 16 threads Intel(R) Core(TM) i7-13620H (Raptor Lake) with 32G memory
(please refer to attached dmesg/kmsg for entire log/backtrace)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <oliver.sang@intel.com>
| Closes: https://lore.kernel.org/oe-lkp/202603300921.b5dc709c-lkp@intel.com
kern :warn : [ 74.925211] [ T2261] WARNING: possible circular locking dependency detected
kern :warn : [ 74.925213] [ T2261] 7.0.0-rc2-00011-g42dde4365f89 #1 Tainted: G S W
kern :err : [ 74.937766] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ba000-0x3f7bafff], got write-back
kern :warn : [ 74.939962] [ T2261] ------------------------------------------------------
kern :warn : [ 74.939963] [ T2261] sh/2261 is trying to acquire lock:
kern :warn : [ 74.939964] [ T2261] ffffffff8557ed28
kern :err : [ 74.952510] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7b9000-0x3f7b9fff], got write-back
kern :warn : [ 74.959121] [ T2261] (cpu_add_remove_lock){+.+.}-{4:4}, at: cpu_hotplug_pm_callback (kernel/cpu.c:571 kernel/cpu.c:2011)
kern :err : [ 74.971676] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7af000-0x3f7affff], got write-back
kern :warn : [ 74.973877] [ T2261]
but task is already holding lock:
kern :warn : [ 74.973878] [ T2261] ffffffff85605e30 ((pm_chain_head).rwsem
kern :err : [ 74.986428] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ad000-0x3f7adfff], got write-back
kern :warn : [ 74.990882] [ T2261] ){++++}-{4:4}, at: blocking_notifier_call_chain_robust (kernel/notifier.c:120 kernel/notifier.c:345 kernel/notifier.c:333)
kern :err : [ 75.003437] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f8e5000-0x3f8e5fff], got write-back
kern :warn : [ 75.008321] [ T2261]
which lock already depends on the new lock.
kern :warn : [ 75.008322] [ T2261]
the existing dependency chain (in reverse order) is:
kern :warn : [ 75.008322] [ T2261]
-> #3
user :notice: [ 75.017865] [ T418] Created symlink '/etc/systemd/system/sockets.target.wants/uuidd.socket' → '/usr/lib/systemd/system/uuidd.socket'.
user :notice: [ 75.018570] [ T418] /usr/sbin/policy-rc.d returned 101, not running 'start uuidd.service uuidd.socket'
kern :err : [ 75.020879] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ac000-0x3f7acfff], got write-back
kern :warn : [ 75.023062] [ T2261] ((pm_chain_head).rwsem){++++}-{4:4}
kern :err : [ 75.035631] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ab000-0x3f7abfff], got write-back
kern :warn : [ 75.042492] [ T2261] :
kern :warn : [ 75.042494] [ T2261] __lock_acquire (kernel/locking/lockdep.c:5237 (discriminator 1))
kern :err : [ 75.053565] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f880000-0x3f880fff], got write-back
kern :warn : [ 75.057172] [ T2261] lock_acquire (include/trace/events/lock.h:24 (discriminator 15) include/trace/events/lock.h:24 (discriminator 15) kernel/locking/lockdep.c:5831 (discriminator 15))
kern :err : [ 75.069731] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f881000-0x3f881fff], got write-back
kern :warn : [ 75.076607] [ T2261] down_write (arch/x86/include/asm/preempt.h:80 (discriminator 10) kernel/locking/rwsem.c:1315 (discriminator 10) kernel/locking/rwsem.c:1326 (discriminator 10) kernel/locking/rwsem.c:1591 (discriminator 10))
kern :err : [ 75.081798] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7d8000-0x3f7d8fff], got write-back
kern :warn : [ 75.085380] [ T2261] blocking_notifier_chain_register (kernel/notifier.c:264 kernel/notifier.c:282)
kern :err : [ 75.097937] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7d7000-0x3f7d7fff], got write-back
kern :warn : [ 75.106461] [ T2261] rapl_add_package_cpuslocked (drivers/powercap/intel_rapl_common.c:2267) intel_rapl_common
kern :err : [ 75.119046] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7d1000-0x3f7d1fff], got write-back
kern :warn : [ 75.126242] [ T2261] rapl_cpu_online (drivers/powercap/intel_rapl_msr.c:81) intel_rapl_msr
kern :err : [ 75.131871] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ce000-0x3f7cefff], got write-back
kern :warn : [ 75.144377] [ T2261] cpuhp_invoke_callback (kernel/cpu.c:194)
kern :err : [ 75.152251] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ca000-0x3f7cafff], got write-back
kern :warn : [ 75.164759] [ T2261] cpuhp_thread_fun (kernel/cpu.c:1109 (discriminator 1))
kern :warn : [ 75.164762] [ T2261] smpboot_thread_fn (kernel/smpboot.c:160)
kern :err : [ 75.175063] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7bc000-0x3f7bcfff], got write-back
kern :warn : [ 75.183928] [ T2261] kthread (kernel/kthread.c:467)
kern :err : [ 75.188770] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7bb000-0x3f7bbfff], got write-back
kern :warn : [ 75.200932] [ T2261] ret_from_fork (arch/x86/kernel/process.c:164)
kern :err : [ 75.203171] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ba000-0x3f7bafff], got write-back
kern :warn : [ 75.212468] [ T2261] ret_from_fork_asm (arch/x86/entry/entry_64.S:255)
kern :err : [ 75.214715] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7b9000-0x3f7b9fff], got write-back
kern :warn : [ 75.227219] [ T2261]
-> #2 (cpuhp_state-up){+.+.}-{0:0}
kern :err : [ 75.232580] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7af000-0x3f7affff], got write-back
kern :warn : [ 75.245099] [ T2261] :
kern :warn : [ 75.245100] [ T2261] __lock_acquire (kernel/locking/lockdep.c:5237 (discriminator 1))
kern :err : [ 75.247416] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ad000-0x3f7adfff], got write-back
kern :warn : [ 75.252473] [ T2261] lock_acquire (include/trace/events/lock.h:24 (discriminator 15) include/trace/events/lock.h:24 (discriminator 15) kernel/locking/lockdep.c:5831 (discriminator 15))
kern :warn : [ 75.252475] [ T2261] cpuhp_thread_fun (kernel/cpu.c:1088)
kern :err : [ 75.265022] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f8e5000-0x3f8e5fff], got write-back
kern :warn : [ 75.270422] [ T2261] smpboot_thread_fn (kernel/smpboot.c:160)
kern :warn : [ 75.270424] [ T2261] kthread (kernel/kthread.c:467)
kern :err : [ 75.282979] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ac000-0x3f7acfff], got write-back
kern :warn : [ 75.287599] [ T2261] ret_from_fork (arch/x86/kernel/process.c:164)
kern :warn : [ 75.287602] [ T2261] ret_from_fork_asm (arch/x86/entry/entry_64.S:255)
kern :err : [ 75.300163] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ab000-0x3f7abfff], got write-back
kern :warn : [ 75.306600] [ T2261]
-> #1 (cpu_hotplug_lock){++++}-{0:0}
kern :err : [ 75.319409] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x4035f000-0x40360fff], got write-back
kern :warn : [ 75.327073] [ T2261] :
kern :warn : [ 75.327074] [ T2261] __lock_acquire (kernel/locking/lockdep.c:5237 (discriminator 1))
kern :warn : [ 75.327077] [ T2261] lock_acquire (include/trace/events/lock.h:24 (discriminator 15) include/trace/events/lock.h:24 (discriminator 15) kernel/locking/lockdep.c:5831 (discriminator 15))
kern :err : [ 75.343199] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f880000-0x3f880fff], got write-back
kern :warn : [ 75.346150] [ T2261] percpu_down_write (kernel/locking/percpu-rwsem.c:235)
kern :err : [ 75.358708] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f881000-0x3f881fff], got write-back
kern :warn : [ 75.364461] [ T2261] _cpu_up (include/asm-generic/bitops/instrumented-non-atomic.h:141 include/linux/cpumask.h:649 include/linux/cpumask.h:1246 kernel/cpu.c:1624)
kern :warn : [ 75.364462] [ T2261] cpu_up (kernel/cpu.c:1706)
kern :warn : [ 75.364464] [ T2261] cpuhp_bringup_mask (kernel/cpu.c:1772 (discriminator 1))
kern :err : [ 75.377019] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7d8000-0x3f7d8fff], got write-back
kern :warn : [ 75.382247] [ T2261] bringup_nonboot_cpus (kernel/cpu.c:1851 kernel/cpu.c:1876)
kern :err : [ 75.387605] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7d7000-0x3f7d7fff], got write-back
kern :warn : [ 75.400124] [ T2261] smp_init (include/linux/bitmap.h:461 include/linux/nodemask.h:244 include/linux/nodemask.h:424 kernel/smp.c:1003)
kern :err : [ 75.404613] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7d1000-0x3f7d1fff], got write-back
kern :warn : [ 75.417126] [ T2261] kernel_init_freeable (init/main.c:1685)
kern :err : [ 75.422136] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ce000-0x3f7cefff], got write-back
kern :warn : [ 75.434649] [ T2261] kernel_init (init/main.c:1584)
kern :warn : [ 75.434652] [ T2261] ret_from_fork (arch/x86/kernel/process.c:164)
kern :err : [ 75.439834] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ca000-0x3f7cafff], got write-back
kern :warn : [ 75.452350] [ T2261] ret_from_fork_asm (arch/x86/entry/entry_64.S:255)
kern :warn : [ 75.452352] [ T2261]
-> #0 (
user :err : [ 75.458360] [ T420] error: dpkg -i /opt/deb/python3_3.13.5-1_amd64.deb failed.
kern :err : [ 75.459704] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7bc000-0x3f7bcfff], got write-back
kern :warn : [ 75.472214] [ T2261] cpu_add_remove_lock){+.+.}-{4:4}:
kern :warn : [ 75.472217] [ T2261] check_prev_add (kernel/locking/lockdep.c:3166 (discriminator 2))
kern :err : [ 75.474541] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7bb000-0x3f7bbfff], got write-back
kern :warn : [ 75.479596] [ T2261] validate_chain (kernel/locking/lockdep.c:3285 kernel/locking/lockdep.c:3908)
kern :warn : [ 75.479598] [ T2261] __lock_acquire (kernel/locking/lockdep.c:5237 (discriminator 1))
kern :err : [ 75.492148] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ba000-0x3f7bafff], got write-back
kern :warn : [ 75.497554] [ T2261] lock_acquire (include/trace/events/lock.h:24 (discriminator 15) include/trace/events/lock.h:24 (discriminator 15) kernel/locking/lockdep.c:5831 (discriminator 15))
kern :warn : [ 75.497556] [ T2261] __mutex_lock (arch/x86/include/asm/jump_label.h:37 include/trace/events/lock.h:95 kernel/locking/mutex.c:616 kernel/locking/mutex.c:776)
kern :err : [ 75.502747] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7b9000-0x3f7b9fff], got write-back
kern :warn : [ 75.515254] [ T2261] cpu_hotplug_pm_callback (kernel/cpu.c:571 kernel/cpu.c:2011)
kern :err : [ 75.520613] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7af000-0x3f7affff], got write-back
kern :warn : [ 75.525062] [ T2261] notifier_call_chain (kernel/notifier.c:87)
kern :err : [ 75.537613] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ad000-0x3f7adfff], got write-back
kern :warn : [ 75.542580] [ T2261] blocking_notifier_call_chain_robust (kernel/notifier.c:121 kernel/notifier.c:345 kernel/notifier.c:333)
kern :warn : [ 75.542583] [ T2261] pm_notifier_call_chain_robust (include/linux/notifier.h:207 kernel/power/main.c:174)
kern :err : [ 75.547762] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f8e5000-0x3f8e5fff], got write-back
kern :warn : [ 75.560278] [ T2261] enter_state (kernel/power/suspend.c:381 kernel/power/suspend.c:609)
kern :warn : [ 75.560281] [ T2261] pm_suspend (kernel/power/suspend.c:645 kernel/power/suspend.c:636)
kern :err : [ 75.567809] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ac000-0x3f7acfff], got write-back
kern :warn : [ 75.580320] [ T2261] state_store (kernel/power/main.c:828 (discriminator 1))
kern :warn : [ 75.580322] [ T2261] kernfs_fop_write_iter (fs/kernfs/file.c:88 fs/kernfs/file.c:356)
kern :err : [ 75.582645] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ab000-0x3f7abfff], got write-back
kern :warn : [ 75.587701] [ T2261] vfs_write (fs/read_write.c:596 (discriminator 1) fs/read_write.c:688 (discriminator 1))
kern :warn : [ 75.587703] [ T2261] ksys_write (fs/read_write.c:740)
kern :err : [ 75.595073] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f880000-0x3f880fff], got write-back
kern :warn : [ 75.605660] [ T2261] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
kern :err : [ 75.610934] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f881000-0x3f881fff], got write-back
kern :warn : [ 75.623438] [ T2261] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
kern :warn : [ 75.623441] [ T2261]
other info that might help us debug this:
kern :err : [ 75.627851] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7d8000-0x3f7d8fff], got write-back
kern :warn : [ 75.632216] [ T2261] Chain exists of:
cpu_add_remove_lock -->
kern :err : [ 75.637575] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7d7000-0x3f7d7fff], got write-back
kern :warn : [ 75.650084] [ T2261] cpuhp_state-up --> (pm_chain_head).rwsem
kern :err : [ 75.655616] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7d1000-0x3f7d1fff], got write-back
kern :warn : [ 75.668127] [ T2261]
kern :warn : [ 75.668127] [ T2261] Possible unsafe locking scenario:
kern :warn : [ 75.668128] [ T2261] CPU0 CPU1
kern :warn : [ 75.668129] [ T2261] ---- ----
kern :warn : [ 75.668130] [ T2261] rlock(
kern :err : [ 75.672531] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ce000-0x3f7cefff], got write-back
kern :warn : [ 75.685039] [ T2261] (pm_chain_head).rwsem);
kern :warn : [ 75.685041] [ T2261] lock(cpuhp_state-up
kern :err : [ 75.690656] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ca000-0x3f7cafff], got write-back
kern :warn : [ 75.703171] [ T2261] );
kern :warn : [ 75.703172] [ T2261] lock((pm_chain_head).rwsem);
kern :err : [ 75.707918] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7bc000-0x3f7bcfff], got write-back
kern :warn : [ 75.712887] [ T2261] lock(cpu_add_remove_lock);
kern :warn : [ 75.712889] [ T2261]
*** DEADLOCK ***
The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20260330/202603300921.b5dc709c-lkp@intel.com
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [linux-next:master] [powercap] 42dde4365f: WARNING:possible_circular_locking_dependency_detected
2026-03-30 7:52 [linux-next:master] [powercap] 42dde4365f: WARNING:possible_circular_locking_dependency_detected kernel test robot
@ 2026-03-30 12:06 ` Rafael J. Wysocki
0 siblings, 0 replies; 2+ messages in thread
From: Rafael J. Wysocki @ 2026-03-30 12:06 UTC (permalink / raw)
To: kernel test robot, Kuppuswamy Sathyanarayanan
Cc: oe-lkp, lkp, Rafael J. Wysocki, Zhang Rui, Srinivas Pandruvada,
linux-pm
Hi,
On Mon, Mar 30, 2026 at 9:52 AM kernel test robot <oliver.sang@intel.com> wrote:
>
>
>
> Hello,
>
> kernel test robot noticed "WARNING:possible_circular_locking_dependency_detected" on:
>
> commit: 42dde4365f89dce91bdc07fd1bca047d71dd162e ("powercap: intel_rapl: Register PM notifier only when RAPL package exists")
> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master
>
> [test failed on linux-next/master 85964cdcad0fac9a0eb7b87a0f9d88cc074b854c]
>
> in testcase: kernel-selftests
> version: kernel-selftests-x86_64-9f2693489ef8-1_20260201
> with following parameters:
>
> group: breakpoints
>
>
>
> config: x86_64-rhel-9.4-kselftests
> compiler: gcc-14
> test machine: 16 threads Intel(R) Core(TM) i7-13620H (Raptor Lake) with 32G memory
>
> (please refer to attached dmesg/kmsg for entire log/backtrace)
>
>
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <oliver.sang@intel.com>
> | Closes: https://lore.kernel.org/oe-lkp/202603300921.b5dc709c-lkp@intel.com
>
>
>
> kern :warn : [ 74.925211] [ T2261] WARNING: possible circular locking dependency detected
> kern :warn : [ 74.925213] [ T2261] 7.0.0-rc2-00011-g42dde4365f89 #1 Tainted: G S W
> kern :err : [ 74.937766] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ba000-0x3f7bafff], got write-back
> kern :warn : [ 74.939962] [ T2261] ------------------------------------------------------
> kern :warn : [ 74.939963] [ T2261] sh/2261 is trying to acquire lock:
> kern :warn : [ 74.939964] [ T2261] ffffffff8557ed28
> kern :err : [ 74.952510] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7b9000-0x3f7b9fff], got write-back
> kern :warn : [ 74.959121] [ T2261] (cpu_add_remove_lock){+.+.}-{4:4}, at: cpu_hotplug_pm_callback (kernel/cpu.c:571 kernel/cpu.c:2011)
> kern :err : [ 74.971676] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7af000-0x3f7affff], got write-back
> kern :warn : [ 74.973877] [ T2261]
> but task is already holding lock:
> kern :warn : [ 74.973878] [ T2261] ffffffff85605e30 ((pm_chain_head).rwsem
> kern :err : [ 74.986428] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ad000-0x3f7adfff], got write-back
> kern :warn : [ 74.990882] [ T2261] ){++++}-{4:4}, at: blocking_notifier_call_chain_robust (kernel/notifier.c:120 kernel/notifier.c:345 kernel/notifier.c:333)
> kern :err : [ 75.003437] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f8e5000-0x3f8e5fff], got write-back
> kern :warn : [ 75.008321] [ T2261]
> which lock already depends on the new lock.
>
> kern :warn : [ 75.008322] [ T2261]
> the existing dependency chain (in reverse order) is:
> kern :warn : [ 75.008322] [ T2261]
> -> #3
> user :notice: [ 75.017865] [ T418] Created symlink '/etc/systemd/system/sockets.target.wants/uuidd.socket' → '/usr/lib/systemd/system/uuidd.socket'.
>
> user :notice: [ 75.018570] [ T418] /usr/sbin/policy-rc.d returned 101, not running 'start uuidd.service uuidd.socket'
>
> kern :err : [ 75.020879] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ac000-0x3f7acfff], got write-back
> kern :warn : [ 75.023062] [ T2261] ((pm_chain_head).rwsem){++++}-{4:4}
> kern :err : [ 75.035631] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ab000-0x3f7abfff], got write-back
> kern :warn : [ 75.042492] [ T2261] :
> kern :warn : [ 75.042494] [ T2261] __lock_acquire (kernel/locking/lockdep.c:5237 (discriminator 1))
> kern :err : [ 75.053565] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f880000-0x3f880fff], got write-back
> kern :warn : [ 75.057172] [ T2261] lock_acquire (include/trace/events/lock.h:24 (discriminator 15) include/trace/events/lock.h:24 (discriminator 15) kernel/locking/lockdep.c:5831 (discriminator 15))
> kern :err : [ 75.069731] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f881000-0x3f881fff], got write-back
> kern :warn : [ 75.076607] [ T2261] down_write (arch/x86/include/asm/preempt.h:80 (discriminator 10) kernel/locking/rwsem.c:1315 (discriminator 10) kernel/locking/rwsem.c:1326 (discriminator 10) kernel/locking/rwsem.c:1591 (discriminator 10))
> kern :err : [ 75.081798] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7d8000-0x3f7d8fff], got write-back
> kern :warn : [ 75.085380] [ T2261] blocking_notifier_chain_register (kernel/notifier.c:264 kernel/notifier.c:282)
> kern :err : [ 75.097937] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7d7000-0x3f7d7fff], got write-back
> kern :warn : [ 75.106461] [ T2261] rapl_add_package_cpuslocked (drivers/powercap/intel_rapl_common.c:2267) intel_rapl_common
> kern :err : [ 75.119046] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7d1000-0x3f7d1fff], got write-back
> kern :warn : [ 75.126242] [ T2261] rapl_cpu_online (drivers/powercap/intel_rapl_msr.c:81) intel_rapl_msr
> kern :err : [ 75.131871] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ce000-0x3f7cefff], got write-back
> kern :warn : [ 75.144377] [ T2261] cpuhp_invoke_callback (kernel/cpu.c:194)
> kern :err : [ 75.152251] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ca000-0x3f7cafff], got write-back
> kern :warn : [ 75.164759] [ T2261] cpuhp_thread_fun (kernel/cpu.c:1109 (discriminator 1))
> kern :warn : [ 75.164762] [ T2261] smpboot_thread_fn (kernel/smpboot.c:160)
> kern :err : [ 75.175063] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7bc000-0x3f7bcfff], got write-back
> kern :warn : [ 75.183928] [ T2261] kthread (kernel/kthread.c:467)
> kern :err : [ 75.188770] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7bb000-0x3f7bbfff], got write-back
> kern :warn : [ 75.200932] [ T2261] ret_from_fork (arch/x86/kernel/process.c:164)
> kern :err : [ 75.203171] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ba000-0x3f7bafff], got write-back
> kern :warn : [ 75.212468] [ T2261] ret_from_fork_asm (arch/x86/entry/entry_64.S:255)
> kern :err : [ 75.214715] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7b9000-0x3f7b9fff], got write-back
> kern :warn : [ 75.227219] [ T2261]
> -> #2 (cpuhp_state-up){+.+.}-{0:0}
> kern :err : [ 75.232580] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7af000-0x3f7affff], got write-back
> kern :warn : [ 75.245099] [ T2261] :
> kern :warn : [ 75.245100] [ T2261] __lock_acquire (kernel/locking/lockdep.c:5237 (discriminator 1))
> kern :err : [ 75.247416] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ad000-0x3f7adfff], got write-back
> kern :warn : [ 75.252473] [ T2261] lock_acquire (include/trace/events/lock.h:24 (discriminator 15) include/trace/events/lock.h:24 (discriminator 15) kernel/locking/lockdep.c:5831 (discriminator 15))
> kern :warn : [ 75.252475] [ T2261] cpuhp_thread_fun (kernel/cpu.c:1088)
> kern :err : [ 75.265022] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f8e5000-0x3f8e5fff], got write-back
> kern :warn : [ 75.270422] [ T2261] smpboot_thread_fn (kernel/smpboot.c:160)
> kern :warn : [ 75.270424] [ T2261] kthread (kernel/kthread.c:467)
> kern :err : [ 75.282979] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ac000-0x3f7acfff], got write-back
> kern :warn : [ 75.287599] [ T2261] ret_from_fork (arch/x86/kernel/process.c:164)
> kern :warn : [ 75.287602] [ T2261] ret_from_fork_asm (arch/x86/entry/entry_64.S:255)
> kern :err : [ 75.300163] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ab000-0x3f7abfff], got write-back
> kern :warn : [ 75.306600] [ T2261]
> -> #1 (cpu_hotplug_lock){++++}-{0:0}
> kern :err : [ 75.319409] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x4035f000-0x40360fff], got write-back
> kern :warn : [ 75.327073] [ T2261] :
> kern :warn : [ 75.327074] [ T2261] __lock_acquire (kernel/locking/lockdep.c:5237 (discriminator 1))
> kern :warn : [ 75.327077] [ T2261] lock_acquire (include/trace/events/lock.h:24 (discriminator 15) include/trace/events/lock.h:24 (discriminator 15) kernel/locking/lockdep.c:5831 (discriminator 15))
> kern :err : [ 75.343199] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f880000-0x3f880fff], got write-back
> kern :warn : [ 75.346150] [ T2261] percpu_down_write (kernel/locking/percpu-rwsem.c:235)
> kern :err : [ 75.358708] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f881000-0x3f881fff], got write-back
> kern :warn : [ 75.364461] [ T2261] _cpu_up (include/asm-generic/bitops/instrumented-non-atomic.h:141 include/linux/cpumask.h:649 include/linux/cpumask.h:1246 kernel/cpu.c:1624)
> kern :warn : [ 75.364462] [ T2261] cpu_up (kernel/cpu.c:1706)
> kern :warn : [ 75.364464] [ T2261] cpuhp_bringup_mask (kernel/cpu.c:1772 (discriminator 1))
> kern :err : [ 75.377019] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7d8000-0x3f7d8fff], got write-back
> kern :warn : [ 75.382247] [ T2261] bringup_nonboot_cpus (kernel/cpu.c:1851 kernel/cpu.c:1876)
> kern :err : [ 75.387605] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7d7000-0x3f7d7fff], got write-back
> kern :warn : [ 75.400124] [ T2261] smp_init (include/linux/bitmap.h:461 include/linux/nodemask.h:244 include/linux/nodemask.h:424 kernel/smp.c:1003)
> kern :err : [ 75.404613] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7d1000-0x3f7d1fff], got write-back
> kern :warn : [ 75.417126] [ T2261] kernel_init_freeable (init/main.c:1685)
> kern :err : [ 75.422136] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ce000-0x3f7cefff], got write-back
> kern :warn : [ 75.434649] [ T2261] kernel_init (init/main.c:1584)
> kern :warn : [ 75.434652] [ T2261] ret_from_fork (arch/x86/kernel/process.c:164)
> kern :err : [ 75.439834] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ca000-0x3f7cafff], got write-back
> kern :warn : [ 75.452350] [ T2261] ret_from_fork_asm (arch/x86/entry/entry_64.S:255)
> kern :warn : [ 75.452352] [ T2261]
> -> #0 (
> user :err : [ 75.458360] [ T420] error: dpkg -i /opt/deb/python3_3.13.5-1_amd64.deb failed.
>
> kern :err : [ 75.459704] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7bc000-0x3f7bcfff], got write-back
> kern :warn : [ 75.472214] [ T2261] cpu_add_remove_lock){+.+.}-{4:4}:
> kern :warn : [ 75.472217] [ T2261] check_prev_add (kernel/locking/lockdep.c:3166 (discriminator 2))
> kern :err : [ 75.474541] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7bb000-0x3f7bbfff], got write-back
> kern :warn : [ 75.479596] [ T2261] validate_chain (kernel/locking/lockdep.c:3285 kernel/locking/lockdep.c:3908)
> kern :warn : [ 75.479598] [ T2261] __lock_acquire (kernel/locking/lockdep.c:5237 (discriminator 1))
> kern :err : [ 75.492148] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ba000-0x3f7bafff], got write-back
> kern :warn : [ 75.497554] [ T2261] lock_acquire (include/trace/events/lock.h:24 (discriminator 15) include/trace/events/lock.h:24 (discriminator 15) kernel/locking/lockdep.c:5831 (discriminator 15))
> kern :warn : [ 75.497556] [ T2261] __mutex_lock (arch/x86/include/asm/jump_label.h:37 include/trace/events/lock.h:95 kernel/locking/mutex.c:616 kernel/locking/mutex.c:776)
> kern :err : [ 75.502747] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7b9000-0x3f7b9fff], got write-back
> kern :warn : [ 75.515254] [ T2261] cpu_hotplug_pm_callback (kernel/cpu.c:571 kernel/cpu.c:2011)
> kern :err : [ 75.520613] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7af000-0x3f7affff], got write-back
> kern :warn : [ 75.525062] [ T2261] notifier_call_chain (kernel/notifier.c:87)
> kern :err : [ 75.537613] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ad000-0x3f7adfff], got write-back
> kern :warn : [ 75.542580] [ T2261] blocking_notifier_call_chain_robust (kernel/notifier.c:121 kernel/notifier.c:345 kernel/notifier.c:333)
> kern :warn : [ 75.542583] [ T2261] pm_notifier_call_chain_robust (include/linux/notifier.h:207 kernel/power/main.c:174)
> kern :err : [ 75.547762] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f8e5000-0x3f8e5fff], got write-back
> kern :warn : [ 75.560278] [ T2261] enter_state (kernel/power/suspend.c:381 kernel/power/suspend.c:609)
> kern :warn : [ 75.560281] [ T2261] pm_suspend (kernel/power/suspend.c:645 kernel/power/suspend.c:636)
> kern :err : [ 75.567809] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ac000-0x3f7acfff], got write-back
> kern :warn : [ 75.580320] [ T2261] state_store (kernel/power/main.c:828 (discriminator 1))
> kern :warn : [ 75.580322] [ T2261] kernfs_fop_write_iter (fs/kernfs/file.c:88 fs/kernfs/file.c:356)
> kern :err : [ 75.582645] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ab000-0x3f7abfff], got write-back
> kern :warn : [ 75.587701] [ T2261] vfs_write (fs/read_write.c:596 (discriminator 1) fs/read_write.c:688 (discriminator 1))
> kern :warn : [ 75.587703] [ T2261] ksys_write (fs/read_write.c:740)
> kern :err : [ 75.595073] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f880000-0x3f880fff], got write-back
> kern :warn : [ 75.605660] [ T2261] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
> kern :err : [ 75.610934] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f881000-0x3f881fff], got write-back
> kern :warn : [ 75.623438] [ T2261] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
> kern :warn : [ 75.623441] [ T2261]
> other info that might help us debug this:
>
> kern :err : [ 75.627851] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7d8000-0x3f7d8fff], got write-back
> kern :warn : [ 75.632216] [ T2261] Chain exists of:
> cpu_add_remove_lock -->
> kern :err : [ 75.637575] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7d7000-0x3f7d7fff], got write-back
> kern :warn : [ 75.650084] [ T2261] cpuhp_state-up --> (pm_chain_head).rwsem
> kern :err : [ 75.655616] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7d1000-0x3f7d1fff], got write-back
> kern :warn : [ 75.668127] [ T2261]
>
> kern :warn : [ 75.668127] [ T2261] Possible unsafe locking scenario:
>
> kern :warn : [ 75.668128] [ T2261] CPU0 CPU1
> kern :warn : [ 75.668129] [ T2261] ---- ----
> kern :warn : [ 75.668130] [ T2261] rlock(
> kern :err : [ 75.672531] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ce000-0x3f7cefff], got write-back
> kern :warn : [ 75.685039] [ T2261] (pm_chain_head).rwsem);
> kern :warn : [ 75.685041] [ T2261] lock(cpuhp_state-up
> kern :err : [ 75.690656] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7ca000-0x3f7cafff], got write-back
> kern :warn : [ 75.703171] [ T2261] );
> kern :warn : [ 75.703172] [ T2261] lock((pm_chain_head).rwsem);
> kern :err : [ 75.707918] [ T2140] x86/PAT: bmc-watchdog:2140 map pfn expected mapping type uncached-minus for [mem 0x3f7bc000-0x3f7bcfff], got write-back
> kern :warn : [ 75.712887] [ T2261] lock(cpu_add_remove_lock);
> kern :warn : [ 75.712889] [ T2261]
> *** DEADLOCK ***
>
>
>
> The kernel config and materials to reproduce are available at:
> https://download.01.org/0day-ci/archive/20260330/202603300921.b5dc709c-lkp@intel.com
The report is correct.
rapl_pm_notifier cannot be registered with CPUs locked because CPU
hotplug has its own PM notifier which locks CPUs under
(pm_chain_head).rwsem.
I'm dropping commit 42dde4365f89 ("powercap: intel_rapl: Register PM
notifier only when RAPL package exists") along all of the commits that
depend on it from my linux-next branch.
Thanks!
^ permalink raw reply [flat|nested] 2+ messages in thread
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2026-03-30 7:52 [linux-next:master] [powercap] 42dde4365f: WARNING:possible_circular_locking_dependency_detected kernel test robot
2026-03-30 12:06 ` Rafael J. Wysocki
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