Regressions on qemu-arm64 boot warnings on Linux next-20250512 tags and next-20250513 tags.

First seen on Linux next-20250512. Good: next-20250509 Bad: next-20250512 and next-20250513

Regression Analysis: - New regression? Yes - Reproducibility? Yes

Boot regression: arm64 WARNING arm64 arch_enter_lazy_mmu_mode __apply_to_page_range

Reported-by: Linux Kernel Functional Testing lkft@linaro.org

## Boot warnings on qemu-arm64

<6>[ 1.990638] pci_bus 0000:00: resource 5 [mem 0x10000000-0x3efeffff] <6>[ 1.990883] pci_bus 0000:00: resource 6 [mem 0x8000000000-0xffffffffff] <4>[ 2.540216] ------------[ cut here ]------------ <4>[ 2.540462] WARNING: CPU: 0 PID: 1 at arch/arm64/include/asm/pgtable.h:82 arch_enter_lazy_mmu_mode (arch/arm64/include/asm/pgtable.h:82 (discriminator 1)) <4>[ 2.542895] Modules linked in: <4>[ 2.544646] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.15.0-rc6-next-20250512 #1 PREEMPT <4>[ 2.545645] Hardware name: linux,dummy-virt (DT) <4>[ 2.546426] pstate: 02402009 (nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) <4>[ 2.547215] pc : arch_enter_lazy_mmu_mode (arch/arm64/include/asm/pgtable.h:82 (discriminator 1)) <4>[ 2.547728] lr : __apply_to_page_range (mm/memory.c:2977 mm/memory.c:3024 mm/memory.c:3060 mm/memory.c:3096 mm/memory.c:3132) <4>[ 2.548285] sp : ffff800080003c30 <4>[ 2.548659] x29: ffff800080003cb0 x28: fff00000ff60b160 x27: fff00000ffe2c000 <4>[ 2.549707] x26: fff00000ffe2d000 x25: ffff9bafa2c13000 x24: fff00000c02f0000 <4>[ 2.550684] x23: ffff800080003d20 x22: fff00000ff80bff8 x21: ffff9bafa0240238 <4>[ 2.551541] x20: 0000000000000001 x19: fff00000ffe2d000 x18: ffff80008002bc68 <4>[ 2.552142] x17: fff064515ca85000 x16: ffff800080000000 x15: 0000000077c57533 <4>[ 2.552640] x14: 00000000d92d0ef0 x13: 00000000d20abc0c x12: 00000000fb25c40b <4>[ 2.553842] x11: 00198b3bc0a2931a x10: 000000000000012e x9 : fff00000ffe2d000 <4>[ 2.555089] x8 : fff00080ffe2c000 x7 : fff00000ffdfe018 x6 : fff00000ffe2d000 <4>[ 2.556016] x5 : fff00000ffe2d000 x4 : 0000000040000000 x3 : fff00000ff60b000 <4>[ 2.556877] x2 : 0000000000000160 x1 : 000000013f60b000 x0 : 0000000000000100 <4>[ 2.558390] Call trace: <4>[ 2.559189] arch_enter_lazy_mmu_mode (arch/arm64/include/asm/pgtable.h:82 (discriminator 1)) (P) <4>[ 2.560081] apply_to_page_range (mm/memory.c:3152) <4>[ 2.560386] set_memory_valid (arch/arm64/mm/pageattr.c:64 arch/arm64/mm/pageattr.c:170) <4>[ 2.560641] kfence_guarded_free (mm/kfence/core.c:570) <4>[ 2.560899] __kfence_free (mm/kfence/core.c:1189) <4>[ 2.561978] kmem_cache_free (mm/slub.c:2319 mm/slub.c:4642 mm/slub.c:4744) <4>[ 2.562391] kernfs_free_rcu (fs/kernfs/dir.c:556) <4>[ 2.562761] rcu_core (arch/arm64/include/asm/preempt.h:13 (discriminator 1) kernel/rcu/tree.c:2583 (discriminator 1) kernel/rcu/tree.c:2832 (discriminator 1)) <4>[ 2.563100] rcu_core_si (kernel/rcu/tree.c:2850) <4>[ 2.563435] handle_softirqs (arch/arm64/include/asm/jump_label.h:36 include/trace/events/irq.h:142 kernel/softirq.c:580) <4>[ 2.563819] __do_softirq (kernel/softirq.c:614) <4>[ 2.565112] ____do_softirq (arch/arm64/kernel/irq.c:82) <4>[ 2.565693] call_on_irq_stack (arch/arm64/kernel/entry.S:897) <4>[ 2.566065] do_softirq_own_stack (arch/arm64/kernel/irq.c:87) <4>[ 2.566687] __irq_exit_rcu (kernel/softirq.c:460 kernel/softirq.c:680) <4>[ 2.567412] irq_exit_rcu (kernel/softirq.c:698) <4>[ 2.567644] el1_interrupt (arch/arm64/include/asm/current.h:19 arch/arm64/kernel/entry-common.c:280 arch/arm64/kernel/entry-common.c:586 arch/arm64/kernel/entry-common.c:598) <4>[ 2.567893] el1h_64_irq_handler (arch/arm64/kernel/entry-common.c:604) <4>[ 2.568230] el1h_64_irq (arch/arm64/kernel/entry.S:596) <4>[ 2.569665] kobject_add_internal (lib/kobject.c:73 (discriminator 1) lib/kobject.c:240 (discriminator 1)) (P) <4>[ 2.570133] kobject_init_and_add (lib/kobject.c:374 lib/kobject.c:457) <4>[ 2.570545] bus_add_driver (drivers/base/bus.c:671) <4>[ 2.570921] driver_register (drivers/base/driver.c:249) <4>[ 2.571623] __platform_driver_register (drivers/base/platform.c:868) <4>[ 2.571917] meson_secure_pwrc_driver_init (drivers/pmdomain/amlogic/meson-secure-pwrc.c:411) <4>[ 2.572360] do_one_initcall (init/main.c:1273) <4>[ 2.573619] kernel_init_freeable (init/main.c:1334 (discriminator 1) init/main.c:1351 (discriminator 1) init/main.c:1370 (discriminator 1) init/main.c:1583 (discriminator 1)) <4>[ 2.574521] kernel_init (init/main.c:1477) <4>[ 2.574873] ret_from_fork (arch/arm64/kernel/entry.S:863) <4>[ 2.575882] ---[ end trace 0000000000000000 ]--- <4>[ 2.641680] ------------[ cut here ]------------ <4>[ 2.641748] WARNING: CPU: 0 PID: 1 at arch/arm64/include/asm/pgtable.h:82 arch_enter_lazy_mmu_mode (arch/arm64/include/asm/pgtable.h:82 (discriminator 1)) <4>[ 2.644422] Modules linked in: <4>[ 2.645675] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Tainted: G W 6.15.0-rc6-next-20250512 #1 PREEMPT <4>[ 2.646879] Tainted: [W]=WARN <4>[ 2.647143] Hardware name: linux,dummy-virt (DT) <4>[ 2.647759] pstate: 02402009 (nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) <4>[ 2.648749] pc : arch_enter_lazy_mmu_mode (arch/arm64/include/asm/pgtable.h:82 (discriminator 1)) <4>[ 2.649690] lr : __apply_to_page_range (mm/memory.c:2977 mm/memory.c:3024 mm/memory.c:3060 mm/memory.c:3096 mm/memory.c:3132) <4>[ 2.650373] sp : ffff800080003c30 <4>[ 2.650941] x29: ffff800080003cb0 x28: fff00000ff60b170 x27: fff00000ffe2e000 <4>[ 2.651625] x26: fff00000ffe2f000 x25: ffff9bafa2c13000 x24: fff00000c02f0000 <4>[ 2.652098] x23: ffff800080003d20 x22: fff00000ff80bff8 x21: ffff9bafa0240238 <4>[ 2.652519] x20: 0000000000000001 x19: fff00000ffe2f000 x18: 0000000000000000 <4>[ 2.652960] x17: fff064515ca85000 x16: ffff800080000000 x15: 0000000000000000 <4>[ 2.654144] x14: 0000000000000000 x13: 00000000ffffffff x12: 0000000000000000 <4>[ 2.655353] x11: 008d1ac5265f1ad6 x10: 0000000000000252 x9 : fff00000ffe2f000 <4>[ 2.656581] x8 : fff00080ffe2e000 x7 : fff00000ffdfe018 x6 : fff00000ffe2f000 <4>[ 2.657594] x5 : fff00000ffe2f000 x4 : 0000000040000000 x3 : fff00000ff60b000 <4>[ 2.658687] x2 : 0000000000000170 x1 : 000000013f60b000 x0 : 0000000000000101 <4>[ 2.659818] Call trace: <4>[ 2.660277] arch_enter_lazy_mmu_mode (arch/arm64/include/asm/pgtable.h:82 (discriminator 1)) (P) <4>[ 2.661214] apply_to_page_range (mm/memory.c:3152) <4>[ 2.661914] set_memory_valid (arch/arm64/mm/pageattr.c:64 arch/arm64/mm/pageattr.c:170) <4>[ 2.662734] kfence_guarded_free (mm/kfence/core.c:570) <4>[ 2.663477] __kfence_free (mm/kfence/core.c:1189) <4>[ 2.664116] kmem_cache_free (mm/slub.c:2319 mm/slub.c:4642 mm/slub.c:4744) <4>[ 2.664531] kernfs_free_rcu (fs/kernfs/dir.c:556) <4>[ 2.664774] rcu_core (arch/arm64/include/asm/preempt.h:13 (discriminator 1) kernel/rcu/tree.c:2583 (discriminator 1) kernel/rcu/tree.c:2832 (discriminator 1)) <4>[ 2.665190] rcu_core_si (kernel/rcu/tree.c:2850) <4>[ 2.665769] handle_softirqs (arch/arm64/include/asm/jump_label.h:36 include/trace/events/irq.h:142 kernel/softirq.c:580) <4>[ 2.666414] __do_softirq (kernel/softirq.c:614) <4>[ 2.667070] ____do_softirq (arch/arm64/kernel/irq.c:82) <4>[ 2.667664] call_on_irq_stack (arch/arm64/kernel/entry.S:897) <4>[ 2.668433] do_softirq_own_stack (arch/arm64/kernel/irq.c:87) <4>[ 2.669064] __irq_exit_rcu (kernel/softirq.c:460 kernel/softirq.c:680) <4>[ 2.669725] irq_exit_rcu (kernel/softirq.c:698) <4>[ 2.670429] el1_interrupt (arch/arm64/include/asm/current.h:19 arch/arm64/kernel/entry-common.c:280 arch/arm64/kernel/entry-common.c:586 arch/arm64/kernel/entry-common.c:598) <4>[ 2.671083] el1h_64_irq_handler (arch/arm64/kernel/entry-common.c:604) <4>[ 2.671343] el1h_64_irq (arch/arm64/kernel/entry.S:596) <4>[ 2.671595] arch_stack_walk (arch/arm64/kernel/stacktrace.c:343 (discriminator 12) arch/arm64/kernel/stacktrace.c:387 (discriminator 12)) (P) <4>[ 2.671876] return_address (arch/arm64/kernel/return_address.c:45) <4>[ 2.672126] preempt_count_sub (include/linux/ftrace.h:1091 kernel/sched/core.c:5885 kernel/sched/core.c:5882 kernel/sched/core.c:5904) <4>[ 2.672375] _raw_spin_unlock (arch/arm64/include/asm/current.h:19 arch/arm64/include/asm/preempt.h:79 include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:186) <4>[ 2.672610] bus_to_subsys (drivers/base/bus.c:84) <4>[ 2.672842] bus_notify (drivers/base/bus.c:998) <4>[ 2.673431] driver_sysfs_add (drivers/base/dd.c:441 (discriminator 1)) <4>[ 2.674103] really_probe (drivers/base/dd.c:645) <4>[ 2.674677] __driver_probe_device (drivers/base/dd.c:799) <4>[ 2.675449] driver_probe_device (drivers/base/dd.c:829) <4>[ 2.676086] __driver_attach (drivers/base/dd.c:1216) <4>[ 2.676614] bus_for_each_dev (drivers/base/bus.c:370) <4>[ 2.677234] driver_attach (drivers/base/dd.c:1234) <4>[ 2.677828] bus_add_driver (drivers/base/bus.c:678) <4>[ 2.678468] driver_register (drivers/base/driver.c:249) <4>[ 2.679177] __platform_driver_register (drivers/base/platform.c:868) <4>[ 2.679987] virtio_mmio_init (drivers/virtio/virtio_mmio.c:862) <4>[ 2.680750] do_one_initcall (init/main.c:1273) <4>[ 2.681577] kernel_init_freeable (init/main.c:1334 (discriminator 1) init/main.c:1351 (discriminator 1) init/main.c:1370 (discriminator 1) init/main.c:1583 (discriminator 1)) <4>[ 2.682395] kernel_init (init/main.c:1477) <4>[ 2.683103] ret_from_fork (arch/arm64/kernel/entry.S:863) <4>[ 2.683740] ---[ end trace 0000000000000000 ]---

## Test arm64 * Boot log: https://qa-reports.linaro.org/api/testruns/28432151/log_file/ * Test history: https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250512/tes... * Test details: https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250512/tes... * Build link: https://storage.tuxsuite.com/public/linaro/lkft/builds/2wzhpVuPjk17ixzQZ6Wlx... * Kernel config: https://storage.tuxsuite.com/public/linaro/lkft/builds/2wzhpVuPjk17ixzQZ6Wlx... * Toolchain: gcc-13

## Build * kernel: 6.15.0-rc6-next-20250512 * git: https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next.git * git commit: edef457004774e598fc4c1b7d1d4f0bcd9d0bb30 * git describe: 6.15.0-rc6-next-20250512 * test details: https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250512/

-- Linaro LKFT https://lkft.linaro.org