last executing test programs: kernel console output (not intermixed with test programs): Warning: Permanently added '10.128.0.160' (ED25519) to the list of known hosts. [ 20.925738][ T4592] cgroup: Unknown subsys name 'net' [ 21.015801][ T4592] cgroup: Unknown subsys name 'cpuset' [ 21.017803][ T4592] cgroup: Unknown subsys name 'rlimit' [ 21.147433][ T4654] [ 21.147823][ T4654] ===================================== [ 21.148782][ T4654] WARNING: bad unlock balance detected! [ 21.149730][ T4654] syzkaller #0 Not tainted [ 21.150537][ T4654] ------------------------------------- [ 21.151493][ T4654] dhcpcd-run-hook/4654 is trying to release lock (rcu_read_lock) at: [ 21.152952][ T4654] [] rcu_lock_release+0x18/0x40 [ 21.154026][ T4654] but there are no more locks to release! [ 21.155029][ T4654] [ 21.155029][ T4654] other info that might help us debug this: [ 21.156503][ T4654] 1 lock held by dhcpcd-run-hook/4654: [ 21.157493][ T4654] #0: ffff0000cce19948 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1a4/0x460 [ 21.159138][ T4654] [ 21.159138][ T4654] stack backtrace: [ 21.160146][ T4654] CPU: 0 UID: 0 PID: 4654 Comm: dhcpcd-run-hook Not tainted syzkaller #0 PREEMPT [ 21.161746][ T4654] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 [ 21.163559][ T4654] Call trace: [ 21.164117][ T4654] show_stack+0x2c/0x3c (C) [ 21.164880][ T4654] __dump_stack+0x30/0x40 [ 21.165627][ T4654] dump_stack_lvl+0xd8/0x12c [ 21.166425][ T4654] dump_stack+0x1c/0x28 [ 21.167165][ T4654] print_unlock_imbalance_bug+0xf4/0xfc [ 21.168193][ T4654] lock_release+0x1dc/0x3b0 [ 21.169019][ T4654] rcu_lock_release+0x30/0x40 [ 21.169867][ T4654] do_wp_page+0x1f48/0x3fe8 [ 21.170717][ T4654] handle_mm_fault+0x10d0/0x2450 [ 21.171569][ T4654] do_page_fault+0x768/0xb64 [ 21.172377][ T4654] do_mem_abort+0x70/0x190 [ 21.173188][ T4654] el0_da+0x68/0x23c [ 21.173851][ T4654] el0t_64_sync_handler+0x10c/0x148 [ 21.174781][ T4654] el0t_64_sync+0x198/0x19c [ 21.177888][ T4654] ------------[ cut here ]------------ [ 21.177896][ T4654] WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x98/0x104, CPU#0: dhcpcd-run-hook/4654 [ 21.180733][ T4654] Modules linked in: [ 21.181397][ T4654] CPU: 0 UID: 0 PID: 4654 Comm: dhcpcd-run-hook Not tainted syzkaller #0 PREEMPT [ 21.182791][ T4654] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 [ 21.184378][ T4654] pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) [ 21.185666][ T4654] pc : __rcu_read_unlock+0x98/0x104 [ 21.186614][ T4654] lr : do_wp_page+0x1f4c/0x3fe8 [ 21.187549][ T4654] sp : ffff8000951f7960 [ 21.188272][ T4654] x29: ffff8000951f7970 x28: ffff700012a3ef4c x27: 1ffff00012a3ef96 [ 21.189590][ T4654] x26: dfff800000000000 x25: ffff8000951f7cb0 x24: 1fffffbff86b1fe0 [ 21.191005][ T4654] x23: 1ffff00012a3ef8f x22: 0000000000000001 x21: dfff800000000000 [ 21.192447][ T4654] x20: 1fffe0001a85bb70 x19: ffff0000d42ddb84 x18: 00000000ffffffff [ 21.193881][ T4654] x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 [ 21.195353][ T4654] x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000000 [ 21.196709][ T4654] x11: 0000000000000455 x10: 0000000000000003 x9 : 0000000000000007 [ 21.198112][ T4654] x8 : 0000000000000003 x7 : 0000000000000000 x6 : ffff8000804886d0 [ 21.199521][ T4654] x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff80008048c3e0 [ 21.200799][ T4654] x2 : 0000000100000000 x1 : ffff0000d42dd700 x0 : ffff0000d42dd700 [ 21.202222][ T4654] Call trace: [ 21.202800][ T4654] __rcu_read_unlock+0x98/0x104 (P) [ 21.203739][ T4654] do_wp_page+0x1f4c/0x3fe8 [ 21.204540][ T4654] handle_mm_fault+0x10d0/0x2450 [ 21.205444][ T4654] do_page_fault+0x768/0xb64 [ 21.206310][ T4654] do_mem_abort+0x70/0x190 [ 21.207123][ T4654] el0_da+0x68/0x23c [ 21.207858][ T4654] el0t_64_sync_handler+0x10c/0x148 [ 21.208823][ T4654] el0t_64_sync+0x198/0x19c [ 21.209722][ T4654] irq event stamp: 165 [ 21.210382][ T4654] hardirqs last enabled at (165): [] _raw_spin_unlock_irqrestore+0x38/0x98 [ 21.212186][ T4654] hardirqs last disabled at (164): [] _raw_spin_lock_irqsave+0x2c/0x7c [ 21.213972][ T4654] softirqs last enabled at (18): [] local_bh_enable+0x10/0x34 [ 21.215560][ T4654] softirqs last disabled at (16): [] local_bh_disable+0x10/0x34 [ 21.217152][ T4654] ---[ end trace 0000000000000000 ]--- [ 21.218199][ C0] ------------[ cut here ]------------ [ 21.218209][ C0] WARNING: kernel/rcu/tree_plugin.h:823 at rcu_sched_clock_irq+0xd88/0x13c0, CPU#0: dhcpcd-run-hook/4654 [ 21.220977][ C0] Modules linked in: Setting up swapspace version 1, size = 127995904 bytes [ 21.221708][ C0] CPU: 0 UID: 0 PID: 4654 Comm: dhcpcd-run-hook Tainted: G W syzkaller #0 PREEMPT [ 21.223583][ C0] Tainted: [W]=WARN [ 21.223604][ T4592] Adding 124996k swap on ./swap-file. Priority:0 extents:1 across:124996k SS [ 21.225794][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 [ 21.227584][ C0] pstate: 834000c5 (Nzcv daIF +PAN -UAO +TCO +DIT -SSBS BTYPE=--) [ 21.229021][ C0] pc : rcu_sched_clock_irq+0xd88/0x13c0 [ 21.230125][ C0] lr : rcu_sched_clock_irq+0x4b4/0x13c0 [ 21.231149][ C0] sp : ffff80008e8d7b60 [ 21.231839][ C0] x29: ffff80008e8d7b90 x28: 1ffff0001111bd74 x27: ffff8000888de000 [ 21.233219][ C0] x26: dfff800000000000 x25: 1fffe0001a85bb70 x24: ffff8000888df688 [ 21.234583][ C0] x23: ffff800088896380 x22: ffff0000d42dd708 x21: ffff0000d42ddb84 [ 21.235981][ C0] x20: ffff0000d42dd700 x19: 0000000000000000 x18: 00000000ffffffff [ 21.237402][ C0] x17: ffff800125887000 x16: ffff80008e8d0000 x15: 0000000000000000 [ 21.238841][ C0] x14: 00004c4b40000000 x13: 0000000000000001 x12: 0000000000000000 [ 21.240217][ C0] x11: 0000000000000000 x10: 0000000000000001 x9 : 0000000000000000 [ 21.241613][ C0] x8 : 00000000ffffffff x7 : 7fffffffffffffff x6 : 00004c4b40000000 [ 21.242915][ C0] x5 : ffff80008e5c10e8 x4 : ffff80008e5c1218 x3 : ffff8000804d00f8 [ 21.244324][ C0] x2 : 0000000000000000 x1 : ffff0000d42dd700 x0 : 0000000000000000 [ 21.245676][ C0] Call trace: [ 21.246193][ C0] rcu_sched_clock_irq+0xd88/0x13c0 (P) [ 21.247188][ C0] update_process_times+0x320/0x4a4 [ 21.248175][ C0] tick_nohz_handler+0x38c/0x678 [ 21.249096][ C0] __hrtimer_run_queues+0x2e8/0xc08 [ 21.250002][ C0] hrtimer_interrupt+0x300/0x690 [ 21.250970][ C0] arch_timer_handler_virt+0x70/0x84 [ 21.252028][ C0] handle_percpu_devid_irq+0x23c/0x3d0 [ 21.253089][ C0] generic_handle_domain_irq+0xe0/0x140 [ 21.254160][ C0] gic_handle_irq+0x6c/0x180 [ 21.254961][ C0] call_on_irq_stack+0x30/0x48 [ 21.255926][ C0] do_interrupt_handler+0xd4/0x138 [ 21.256845][ C0] el1_interrupt+0x3c/0x60 [ 21.257698][ C0] el1h_64_irq_handler+0x18/0x24 [ 21.258543][ C0] el1h_64_irq+0x6c/0x70 [ 21.259469][ C0] __rcu_read_unlock+0x9c/0x104 (P) [ 21.260320][ C0] do_wp_page+0x1f4c/0x3fe8 [ 21.261123][ C0] handle_mm_fault+0x10d0/0x2450 [ 21.262115][ C0] do_page_fault+0x768/0xb64 [ 21.262938][ C0] do_mem_abort+0x70/0x190 [ 21.263749][ C0] el0_da+0x68/0x23c [ 21.264512][ C0] el0t_64_sync_handler+0x10c/0x148 [ 21.265436][ C0] el0t_64_sync+0x198/0x19c [ 21.266243][ C0] irq event stamp: 165 [ 21.266998][ C0] hardirqs last enabled at (165): [] _raw_spin_unlock_irqrestore+0x38/0x98 [ 21.268621][ C0] hardirqs last disabled at (164): [] _raw_spin_lock_irqsave+0x2c/0x7c [ 21.270417][ C0] softirqs last enabled at (18): [] local_bh_enable+0x10/0x34 [ 21.272155][ C0] softirqs last disabled at (16): [] local_bh_disable+0x10/0x34 [ 21.273720][ C0] ---[ end trace 0000000000000000 ]--- [ 21.276705][ T4654] BUG: sleeping function called from invalid context at ./include/linux/sched/mm.h:323 [ 21.276794][ T4654] in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 4654, name: dhcpcd-run-hook [ 21.276804][ T4654] preempt_count: 0, expected: 0 [ 21.276810][ T4654] RCU nest depth: -1, expected: 0 [ 21.276815][ T4654] INFO: lockdep is turned off. [ 21.276820][ T4654] CPU: 0 UID: 0 PID: 4654 Comm: dhcpcd-run-hook Tainted: G W syzkaller #0 PREEMPT [ 21.276830][ T4654] Tainted: [W]=WARN [ 21.276833][ T4654] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 [ 21.276837][ T4654] Call trace: [ 21.276839][ T4654] show_stack+0x2c/0x3c (C) [ 21.276904][ T4654] __dump_stack+0x30/0x40 [ 21.276966][ T4654] dump_stack_lvl+0xd8/0x12c [ 21.277027][ T4654] dump_stack+0x1c/0x28 [ 21.277088][ T4654] __might_resched+0x350/0x4ac [ 21.277150][ T4654] __might_sleep+0x84/0xdc [ 21.277215][ T4654] prepare_alloc_pages+0x178/0x4b0 [ 21.277283][ T4654] __alloc_frozen_pages_noprof+0x134/0x31c [ 21.277345][ T4654] alloc_pages_mpol+0x1ec/0x464 [ 21.277405][ T4654] folio_alloc_mpol_noprof+0x4c/0x248 [ 21.277465][ T4654] vma_alloc_folio_noprof+0xfc/0x1d8 [ 21.277525][ T4654] folio_prealloc+0x5c/0x1b0 [ 21.277586][ T4654] do_wp_page+0xf9c/0x3fe8 [ 21.277647][ T4654] handle_mm_fault+0x10d0/0x2450 [ 21.277708][ T4654] do_page_fault+0x768/0xb64 [ 21.277769][ T4654] do_mem_abort+0x70/0x190 [ 21.277830][ T4654] el0_da+0x68/0x23c [ 21.277891][ T4654] el0t_64_sync_handler+0x10c/0x148 [ 21.277952][ T4654] el0t_64_sync+0x198/0x19c