------------[ cut here ]------------ WARNING: CPU: 0 PID: 4321 at kernel/workqueue.c:1441 __queue_work+0xfe0/0x1280 kernel/workqueue.c:1441 Modules linked in: CPU: 0 PID: 4321 Comm: udevd Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/02/2026 pstate: 424000c5 (nZcv daIF +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : __queue_work+0xfe0/0x1280 kernel/workqueue.c:1441 lr : __queue_work+0xfe0/0x1280 kernel/workqueue.c:1441 sp : ffff800008007b70 x29: ffff800008007bb0 x28: 1fffe0001b727a81 x27: dfff800000000000 x26: 0000000000000008 x25: 1fffe0001b727a81 x24: ffff0000d48751c0 x23: 0000000000000000 x22: 0000000000000101 x21: ffff0000d4875000 x20: 00000000000b0012 x19: ffff0000c2f14f70 x18: 0000000000000000 x17: ffff80018a17a000 x16: ffff800011b3e320 x15: 0000000000010001 x14: 0000000000000002 x13: 1ffff00002a66071 x12: 0000000059b97f5b x11: ff008000081f9578 x10: 0000000000000000 x9 : ffff8000081f9578 x8 : ffff0000db93d400 x7 : ffff8000083bd6e8 x6 : 0000000000000000 x5 : 0000000000000080 x4 : 0000000000000001 x3 : ffff800013cc7000 x2 : ffff0000c2f14f70 x1 : 0000000000000100 x0 : 0000000000000000 Call trace: __queue_work+0xfe0/0x1280 kernel/workqueue.c:1441 delayed_work_timer_fn+0x74/0x94 kernel/workqueue.c:1646 call_timer_fn+0x1b8/0x96c kernel/time/timer.c:1701 expire_timers kernel/time/timer.c:1747 [inline] __run_timers+0x4d0/0x6d8 kernel/time/timer.c:2023 run_timer_softirq+0x7c/0x114 kernel/time/timer.c:2036 handle_softirqs+0x318/0xc90 kernel/softirq.c:596 __do_softirq+0x14/0x20 kernel/softirq.c:630 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:80 call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:897 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:85 invoke_softirq kernel/softirq.c:477 [inline] __irq_exit_rcu+0x23c/0x430 kernel/softirq.c:679 irq_exit_rcu+0x14/0x84 kernel/softirq.c:691 __el1_irq arch/arm64/kernel/entry-common.c:472 [inline] el1_interrupt+0x38/0x54 arch/arm64/kernel/entry-common.c:486 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:491 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:581 arch_local_irq_restore arch/arm64/include/asm/irqflags.h:122 [inline] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] _raw_spin_unlock_irqrestore+0x58/0xac kernel/locking/spinlock.c:194 __debug_check_no_obj_freed lib/debugobjects.c:988 [inline] debug_check_no_obj_freed+0x39c/0x454 lib/debugobjects.c:1009 slab_free_hook mm/slub.c:1704 [inline] slab_free_freelist_hook+0x104/0x1e8 mm/slub.c:1755 slab_free mm/slub.c:3687 [inline] kmem_cache_free_bulk+0x340/0x3d4 mm/slub.c:3805 mt_free_bulk lib/maple_tree.c:164 [inline] mas_destroy+0x1c30/0x232c lib/maple_tree.c:5864 mas_store_prealloc+0x288/0x358 lib/maple_tree.c:5792 do_mas_align_munmap+0x940/0xf28 mm/mmap.c:2574 do_mas_munmap mm/mmap.c:2650 [inline] __vm_munmap+0x260/0x390 mm/mmap.c:2936 __do_sys_munmap mm/mmap.c:2961 [inline] __se_sys_munmap mm/mmap.c:2958 [inline] __arm64_sys_munmap+0x64/0x7c mm/mmap.c:2958 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 irq event stamp: 287531 hardirqs last enabled at (287530): [] handle_softirqs+0x1e0/0xc90 kernel/softirq.c:580 hardirqs last disabled at (287531): [] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:117 [inline] hardirqs last disabled at (287531): [] _raw_spin_lock_irq+0x34/0x98 kernel/locking/spinlock.c:170 softirqs last enabled at (287378): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (287529): [] __do_softirq+0x14/0x20 kernel/softirq.c:630 ---[ end trace 0000000000000000 ]--- vkms_vblank_simulate: vblank timer overrun