===================================== WARNING: bad unlock balance detected! syzkaller #0 Not tainted ------------------------------------- dhcpcd-run-hook/4654 is trying to release lock (rcu_read_lock) at: [] rcu_lock_release+0x18/0x40 include/linux/rcupdate.h:309 but there are no more locks to release! other info that might help us debug this: 1 lock held by dhcpcd-run-hook/4654: #0: ffff0000cce19948 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1a4/0x460 mm/mmap_lock.c:310 stack backtrace: CPU: 0 UID: 0 PID: 4654 Comm: dhcpcd-run-hook Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 print_unlock_imbalance_bug+0xf4/0xfc kernel/locking/lockdep.c:5298 __lock_release kernel/locking/lockdep.c:-1 [inline] lock_release+0x1dc/0x3b0 kernel/locking/lockdep.c:5889 rcu_lock_release+0x30/0x40 include/linux/rcupdate.h:310 rcu_read_unlock include/linux/rcupdate.h:869 [inline] pte_unmap include/linux/pgtable.h:117 [inline] do_wp_page+0x1f48/0x3fe8 mm/memory.c:4315 handle_pte_fault mm/memory.c:6427 [inline] __handle_mm_fault mm/memory.c:6549 [inline] handle_mm_fault+0x10d0/0x2450 mm/memory.c:6718 do_page_fault+0x768/0xb64 arch/arm64/mm/fault.c:704 do_mem_abort+0x70/0x190 arch/arm64/mm/fault.c:980 el0_da+0x68/0x23c arch/arm64/kernel/entry-common.c:539 el0t_64_sync_handler+0x10c/0x148 arch/arm64/kernel/entry-common.c:745 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 ------------[ cut here ]------------ WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x98/0x104 kernel/rcu/tree_plugin.h:445, CPU#0: dhcpcd-run-hook/4654 Modules linked in: CPU: 0 UID: 0 PID: 4654 Comm: dhcpcd-run-hook 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 : __rcu_read_unlock+0x98/0x104 kernel/rcu/tree_plugin.h:445 lr : rcu_read_unlock include/linux/rcupdate.h:871 [inline] lr : pte_unmap include/linux/pgtable.h:117 [inline] lr : do_wp_page+0x1f4c/0x3fe8 mm/memory.c:4315 sp : ffff8000951f7960 x29: ffff8000951f7970 x28: ffff700012a3ef4c x27: 1ffff00012a3ef96 x26: dfff800000000000 x25: ffff8000951f7cb0 x24: 1fffffbff86b1fe0 x23: 1ffff00012a3ef8f x22: 0000000000000001 x21: dfff800000000000 x20: 1fffe0001a85bb70 x19: ffff0000d42ddb84 x18: 00000000ffffffff x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000455 x10: 0000000000000003 x9 : 0000000000000007 x8 : 0000000000000003 x7 : 0000000000000000 x6 : ffff8000804886d0 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff80008048c3e0 x2 : 0000000100000000 x1 : ffff0000d42dd700 x0 : ffff0000d42dd700 Call trace: __rcu_read_unlock+0x98/0x104 kernel/rcu/tree_plugin.h:445 (P) rcu_read_unlock include/linux/rcupdate.h:871 [inline] pte_unmap include/linux/pgtable.h:117 [inline] do_wp_page+0x1f4c/0x3fe8 mm/memory.c:4315 handle_pte_fault mm/memory.c:6427 [inline] __handle_mm_fault mm/memory.c:6549 [inline] handle_mm_fault+0x10d0/0x2450 mm/memory.c:6718 do_page_fault+0x768/0xb64 arch/arm64/mm/fault.c:704 do_mem_abort+0x70/0x190 arch/arm64/mm/fault.c:980 el0_da+0x68/0x23c arch/arm64/kernel/entry-common.c:539 el0t_64_sync_handler+0x10c/0x148 arch/arm64/kernel/entry-common.c:745 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 irq event stamp: 165 hardirqs last enabled at (165): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline] hardirqs last enabled at (165): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:198 hardirqs last disabled at (164): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:130 [inline] hardirqs last disabled at (164): [] _raw_spin_lock_irqsave+0x2c/0x7c kernel/locking/spinlock.c:166 softirqs last enabled at (18): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (16): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]--- BUG: sleeping function called from invalid context at ./include/linux/sched/mm.h:323 in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 4654, name: dhcpcd-run-hook preempt_count: 0, expected: 0 RCU nest depth: -1, expected: 0 INFO: lockdep is turned off. CPU: 0 UID: 0 PID: 4654 Comm: dhcpcd-run-hook Tainted: G W syzkaller #0 PREEMPT Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 __might_resched+0x350/0x4ac kernel/sched/core.c:9162 __might_sleep+0x84/0xdc kernel/sched/core.c:9091 might_alloc include/linux/sched/mm.h:323 [inline] prepare_alloc_pages+0x178/0x4b0 mm/page_alloc.c:4995 __alloc_frozen_pages_noprof+0x134/0x31c mm/page_alloc.c:5215 alloc_pages_mpol+0x1ec/0x464 mm/mempolicy.c:2490 folio_alloc_mpol_noprof+0x4c/0x248 mm/mempolicy.c:2509 vma_alloc_folio_noprof+0xfc/0x1d8 mm/mempolicy.c:2544 folio_prealloc+0x5c/0x1b0 mm/memory.c:1193 wp_page_copy mm/memory.c:3859 [inline] do_wp_page+0xf9c/0x3fe8 mm/memory.c:4320 handle_pte_fault mm/memory.c:6427 [inline] __handle_mm_fault mm/memory.c:6549 [inline] handle_mm_fault+0x10d0/0x2450 mm/memory.c:6718 do_page_fault+0x768/0xb64 arch/arm64/mm/fault.c:704 do_mem_abort+0x70/0x190 arch/arm64/mm/fault.c:980 el0_da+0x68/0x23c arch/arm64/kernel/entry-common.c:539 el0t_64_sync_handler+0x10c/0x148 arch/arm64/kernel/entry-common.c:745 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594