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* [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


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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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