watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [kworker/u8:10:5170] Modules linked in: irq event stamp: 847590 hardirqs last enabled at (847589): [] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:507 [inline] hardirqs last enabled at (847589): [] arm64_exit_to_kernel_mode+0x80/0x94 arch/arm64/kernel/entry-common.c:62 hardirqs last disabled at (847590): [] __el1_irq arch/arm64/kernel/entry-common.c:506 [inline] hardirqs last disabled at (847590): [] el1_interrupt+0x28/0x60 arch/arm64/kernel/entry-common.c:522 softirqs last enabled at (847588): [] softirq_handle_end kernel/softirq.c:468 [inline] softirqs last enabled at (847588): [] handle_softirqs+0xbc4/0xd34 kernel/softirq.c:650 softirqs last disabled at (847565): [] __do_softirq+0x14/0x20 kernel/softirq.c:656 CPU: 1 UID: 0 PID: 5170 Comm: kworker/u8:10 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Workqueue: events_unbound toggle_allocation_gate pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : csd_lock_wait kernel/smp.c:342 [inline] pc : smp_call_function_many_cond+0xfa4/0x1614 kernel/smp.c:892 lr : csd_lock_wait kernel/smp.c:342 [inline] lr : smp_call_function_many_cond+0xfbc/0x1614 kernel/smp.c:892 sp : ffff8000a95e7780 x29: ffff8000a95e7890 x28: dfff800000000000 x27: ffff0001a5ff5580 x26: 0000000000000011 x25: 0000000000000000 x24: ffff80008897f680 x23: ffffffffffffffff x22: 1fffe00034bfeab0 x21: 1fffe00034bfeab1 x20: ffff0001a5fd6968 x19: ffff0001a5ff5588 x18: 00000000c2f23110 x17: 00000000fa801a81 x16: dfff800000000000 x15: 000000009e7b0369 x14: 00000000ffff8000 x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: 0000000000ff0100 x9 : 0000000000000000 x8 : 0000000000000011 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000000 x3 : ffff8000805a3f94 x2 : 0000000000000000 x1 : ffff0000c1d43a00 x0 : 0000000000000000 Call trace: __cmpwait_case_32 arch/arm64/include/asm/cmpxchg.h:233 [inline] (P) __cmpwait arch/arm64/include/asm/cmpxchg.h:259 [inline] (P) csd_lock_wait kernel/smp.c:342 [inline] (P) smp_call_function_many_cond+0xfa4/0x1614 kernel/smp.c:892 (P) smp_call_function_many kernel/smp.c:915 [inline] smp_call_function+0x58/0xbc kernel/smp.c:935 kick_all_cpus_sync+0x28/0x34 kernel/smp.c:1081 arch_jump_label_transform_apply+0x14/0x20 arch/arm64/kernel/jump_label.c:34 __jump_label_update+0x314/0x33c kernel/jump_label.c:521 jump_label_update+0x41c/0x4a8 kernel/jump_label.c:910 static_key_enable_cpuslocked+0x11c/0x220 kernel/jump_label.c:210 static_key_enable+0x24/0x38 kernel/jump_label.c:223 toggle_allocation_gate+0xb8/0x28c mm/kfence/core.c:906 process_one_work kernel/workqueue.c:3314 [inline] process_scheduled_works+0x79c/0x1098 kernel/workqueue.c:3397 worker_thread+0x754/0xba0 kernel/workqueue.c:3478 kthread+0x2f8/0x3c8 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:842 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 8620 Comm: syz.7.679 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : handle_softirqs+0x1d0/0xd34 kernel/softirq.c:610 lr : handle_softirqs+0x1cc/0xd34 kernel/softirq.c:606 sp : ffff80008e987ee0 x29: ffff80008e987f80 x28: ffff0000dcadba10 x27: 0000000000000386 x26: ffff0000dcadba08 x25: 1fffe0001b95b741 x24: 0000000000000001 x23: ffff0000dcadba00 x22: dfff800000000000 x21: ffff0001a5fce280 x20: ffff80008891febc x19: ffff0001a5fce280 x18: 0000000000000002 x17: ffff80011d69a000 x16: ffff80008e980000 x15: ffff0001fea147d0 x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000000 x11: ffff80008a3f3d08 x10: 0000000000000003 x9 : 0000000000000000 x8 : 0000000000000f80 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000008 x3 : ffff800080155224 x2 : 0000000000000002 x1 : ffff0000dcadba00 x0 : ffff80011d69a000 Call trace: __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:26 [inline] (P) arch_local_irq_enable arch/arm64/include/asm/irqflags.h:48 [inline] (P) handle_softirqs+0x1d0/0xd34 kernel/softirq.c:606 (P) __do_softirq+0x14/0x20 kernel/softirq.c:656 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:78 call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:889 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:83 invoke_softirq kernel/softirq.c:503 [inline] __irq_exit_rcu+0x1ac/0x428 kernel/softirq.c:735 irq_exit_rcu+0x14/0x84 kernel/softirq.c:752 __el1_irq arch/arm64/kernel/entry-common.c:510 [inline] el1_interrupt+0x40/0x60 arch/arm64/kernel/entry-common.c:522 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:527 el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:590 __kasan_check_byte+0x48/0x54 mm/kasan/common.c:578 (P) kasan_check_byte include/linux/kasan.h:402 [inline] lock_acquire+0xa4/0x368 kernel/locking/lockdep.c:5842 __raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline] _raw_spin_lock+0x48/0x60 kernel/locking/spinlock.c:158 spin_lock include/linux/spinlock.h:342 [inline] shmem_recalc_inode+0x44/0x168 mm/shmem.c:443 shmem_alloc_and_add_folio+0xa68/0xec8 mm/shmem.c:2033 shmem_get_folio_gfp+0x4c8/0x1494 mm/shmem.c:2564 shmem_get_folio mm/shmem.c:2670 [inline] shmem_write_begin+0x160/0x450 mm/shmem.c:3303 generic_perform_write+0x234/0x7b8 mm/filemap.c:4325 shmem_file_write_iter+0x10c/0x134 mm/shmem.c:3478 __kernel_write_iter+0x374/0x770 fs/read_write.c:621 dump_emit_page fs/coredump.c:1304 [inline] dump_user_range+0x494/0x7c0 fs/coredump.c:1378 elf_core_dump+0x2b6c/0x30f0 fs/binfmt_elf.c:2109 coredump_write+0x1074/0x184c fs/coredump.c:1053 do_coredump fs/coredump.c:1132 [inline] vfs_coredump+0x29f0/0x37e0 fs/coredump.c:1206 get_signal+0xd88/0x1094 kernel/signal.c:3022 arch_do_signal_or_restart+0x1dc/0x43a0 arch/arm64/kernel/signal.c:1665 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop+0x70/0x17c kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:244 [inline] arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:103 [inline] el0_da+0x1a4/0x254 arch/arm64/kernel/entry-common.c:553 el0t_64_sync_handler+0x10c/0x148 arch/arm64/kernel/entry-common.c:758 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594