watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz.5.720:7826] Modules linked in: irq event stamp: 186 hardirqs last enabled at (185): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline] hardirqs last enabled at (185): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:198 hardirqs last disabled at (186): [] __el1_irq arch/arm64/kernel/entry-common.c:506 [inline] hardirqs last disabled at (186): [] el1_interrupt+0x28/0x60 arch/arm64/kernel/entry-common.c:522 softirqs last enabled at (180): [] softirq_handle_end kernel/softirq.c:468 [inline] softirqs last enabled at (180): [] handle_softirqs+0xbc4/0xd34 kernel/softirq.c:650 softirqs last disabled at (175): [] __do_softirq+0x14/0x20 kernel/softirq.c:656 CPU: 0 UID: 0 PID: 7826 Comm: syz.5.720 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP 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 : alloc_cpumask_var_node+0x0/0x138 lib/cpumask.c:29 lr : alloc_cpumask_var include/linux/cpumask.h:1052 [inline] lr : zalloc_cpumask_var include/linux/cpumask.h:1058 [inline] lr : clock_was_set+0xa4/0x6b0 kernel/time/hrtimer.c:982 sp : ffff8000967e7940 x29: ffff8000967e79e0 x28: 00000000000000aa x27: 0000000000000000 x26: 1fffe00018ff93a0 x25: dfff800000000000 x24: ffff8000967e7a40 x23: ffff700012cfcf48 x22: 0000000000000000 x21: ffff700012cfcf30 x20: dfff800000000000 x19: ffff8000967e7980 x18: 0000000084121b74 x17: 0000000030be5f3e x16: 00000000d4e7efe3 x15: 0000000000000000 x14: 00005017e7987c00 x13: 0000000000000001 x12: 0000000000000000 x11: ffff80008015517c x10: 0000000000080000 x9 : 0000000000000643 x8 : ffff800095949000 x7 : 0000000000000000 x6 : 00004c4b40000000 x5 : ffff80008e6710e8 x4 : 0000000000000008 x3 : ffff80008054c368 x2 : 00000000ffffffff x1 : 0000000000000dc0 x0 : ffff8000967e79a0 Call trace: alloc_cpumask_var_node+0x0/0x138 lib/cmdline.c:-1 (P) do_adjtimex+0x208/0x2f0 kernel/time/timekeeping.c:2924 posix_clock_realtime_adj+0x20/0x30 kernel/time/posix-timers.c:207 do_clock_adjtime+0x120/0x140 kernel/time/posix-timers.c:1154 __do_sys_clock_adjtime kernel/time/posix-timers.c:1166 [inline] __se_sys_clock_adjtime kernel/time/posix-timers.c:1157 [inline] __arm64_sys_clock_adjtime+0x17c/0x2ac kernel/time/posix-timers.c:1157 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:736 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 4694 Comm: syz-executor Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP 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 : __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline] pc : _raw_spin_unlock_irqrestore+0x44/0x98 kernel/locking/spinlock.c:198 lr : __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline] lr : _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:198 sp : ffff800096716db0 x29: ffff800096716db0 x28: ffff0001a5ffa0f0 x27: dfff800000000000 x26: ffff0001a5ffa0f8 x25: 0000000000000000 x24: ffff0001a5ffa0c0 x23: ffff0001fea147c0 x22: 0000000000000001 x21: 1fffe00034bff41e x20: ffff0001fea14dc0 x19: 0000000000000000 x18: 0000000000000000 x17: 0000000000000002 x16: ffff0001fea147c0 x15: 000000000000e42d x14: 1fffe00034bff418 x13: 0000000000000001 x12: 0000000000000000 x11: ffff80008a3f3d08 x10: 0000000000000003 x9 : 0000000000000000 x8 : 00000000000000c0 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000008 x3 : ffff800080155224 x2 : 0000000000000006 x1 : ffff0000de2a1d00 x0 : ffff80011d6bf000 Call trace: __daif_local_irq_restore arch/arm64/include/asm/irqflags.h:175 [inline] (P) arch_local_irq_restore arch/arm64/include/asm/irqflags.h:195 [inline] (P) __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline] (P) _raw_spin_unlock_irqrestore+0x44/0x98 kernel/locking/spinlock.c:198 (P) spin_unlock_irqrestore include/linux/spinlock.h:408 [inline] free_pcppages_bulk+0x618/0x648 mm/page_alloc.c:1500 free_frozen_page_commit+0x638/0x1108 mm/page_alloc.c:2876 free_unref_folios+0xf10/0x13b8 mm/page_alloc.c:3067 folios_put_refs+0x7c8/0x8c4 mm/swap.c:1008 free_pages_and_swap_cache+0x238/0x3e0 mm/swap_state.c:401 __tlb_batch_free_encoded_pages mm/mmu_gather.c:138 [inline] tlb_batch_pages_flush mm/mmu_gather.c:151 [inline] tlb_flush_mmu_free mm/mmu_gather.c:417 [inline] tlb_flush_mmu+0xf0/0x33c mm/mmu_gather.c:424 zap_pte_range mm/memory.c:1973 [inline] zap_pmd_range mm/memory.c:2020 [inline] zap_pud_range mm/memory.c:2048 [inline] zap_p4d_range mm/memory.c:2069 [inline] __zap_vma_range+0x2f70/0x4058 mm/memory.c:2109 unmap_vmas+0x2d4/0x438 mm/memory.c:2178 exit_mmap+0x1e8/0xaf8 mm/mmap.c:1300 __mmput+0xe4/0x2f0 kernel/fork.c:1178 mmput+0x70/0xa8 kernel/fork.c:1201 exit_mm+0x190/0x26c kernel/exit.c:582 do_exit+0x518/0x1a6c kernel/exit.c:964 do_group_exit+0x194/0x22c kernel/exit.c:1119 __do_sys_exit_group kernel/exit.c:1130 [inline] __se_sys_exit_group kernel/exit.c:1128 [inline] pid_child_should_wake+0x0/0x110 kernel/exit.c:1128 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:736 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594