last executing test programs: kernel console output (not intermixed with test programs): Warning: Permanently added '10.128.1.52' (ED25519) to the list of known hosts. [ 86.763217][ T5580] cgroup: Unknown subsys name 'net' [ 87.026544][ T5580] cgroup: Unknown subsys name 'cpuset' [ 87.069160][ T5580] cgroup: Unknown subsys name 'rlimit' [ 87.239120][ T31] cfg80211: failed to load regulatory.db [ 87.251839][ T5582] [ 87.251849][ T5582] ===================================== [ 87.251855][ T5582] WARNING: bad unlock balance detected! [ 87.251863][ T5582] syzkaller #0 Not tainted [ 87.251871][ T5582] ------------------------------------- [ 87.251877][ T5582] udevd/5582 is trying to release lock (rcu_read_lock) at: [ 87.251897][ T5582] [] do_wp_page+0x1823/0x3d90 [ 87.251922][ T5582] but there are no more locks to release! [ 87.251939][ T5582] [ 87.251939][ T5582] other info that might help us debug this: [ 87.251945][ T5582] 1 lock held by udevd/5582: [ 87.251955][ T5582] #0: ffff88803d0371c8 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 [ 87.252002][ T5582] [ 87.252002][ T5582] stack backtrace: [ 87.252013][ T5582] CPU: 1 UID: 0 PID: 5582 Comm: udevd Not tainted syzkaller #0 PREEMPT_{RT,(full)} [ 87.252033][ T5582] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 [ 87.252043][ T5582] Call Trace: [ 87.252049][ T5582] [ 87.252056][ T5582] dump_stack_lvl+0xe8/0x150 [ 87.252076][ T5582] ? do_wp_page+0x1823/0x3d90 [ 87.252093][ T5582] print_unlock_imbalance_bug+0xdc/0xf0 [ 87.252120][ T5582] lock_release+0x248/0x3c0 [ 87.252142][ T5582] ? do_wp_page+0x1823/0x3d90 [ 87.252161][ T5582] do_wp_page+0x28fb/0x3d90 [ 87.252183][ T5582] ? rt_spin_lock+0x1e0/0x400 [ 87.252205][ T5582] ? do_wp_page+0x1823/0x3d90 [ 87.252226][ T5582] ? preempt_count_add+0x91/0x190 [ 87.252245][ T5582] ? __pfx_do_wp_page+0x10/0x10 [ 87.252261][ T5582] ? rt_spin_lock+0x2ce/0x400 [ 87.252283][ T5582] ? __pfx_rt_spin_lock+0x10/0x10 [ 87.252305][ T5582] ? pte_offset_map_rw_nolock+0xea/0x160 [ 87.252324][ T5582] handle_mm_fault+0x9f5/0x13c0 [ 87.252345][ T5582] ? handle_mm_fault+0xe7/0x13c0 [ 87.252364][ T5582] ? __pfx_handle_mm_fault+0x10/0x10 [ 87.252381][ T5582] ? lock_vma_under_rcu+0x45a/0x500 [ 87.252410][ T5582] do_user_addr_fault+0xa73/0x1340 [ 87.252432][ T5582] ? rcu_is_watching+0x15/0xb0 [ 87.252456][ T5582] ? trace_page_fault_user+0x84/0x1e0 [ 87.252476][ T5582] exc_page_fault+0x6a/0xc0 [ 87.252512][ T5582] asm_exc_page_fault+0x26/0x30 [ 87.252529][ T5582] RIP: 0033:0x559103567f2b [ 87.252544][ T5582] Code: 8d 0d 01 09 03 00 ba b0 00 00 00 48 8d 35 f5 90 02 00 48 8d 3d 2a 92 02 00 e8 c1 75 01 00 e8 9c c9 ff ff 45 31 c9 4d 8b 65 18 <4d> 89 4d 18 4c 8d 6c 24 70 e8 67 fa ff ff 31 ff e8 b0 f9 ff ff 48 [ 87.252558][ T5582] RSP: 002b:00007fff01ce56f0 EFLAGS: 00010246 [ 87.252574][ T5582] RAX: 0000000000000000 RBX: 000055910981bc80 RCX: 0000000000000000 [ 87.252586][ T5582] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 87.252596][ T5582] RBP: 00005591097b1910 R08: 00007fcb6a854b60 R09: 0000000000000000 [ 87.252608][ T5582] R10: 0000000000000008 R11: 0000000000000246 R12: 00005591097f6d00 [ 87.252620][ T5582] R13: 00005591098b5650 R14: 0000000000000000 R15: 0000000000000000 [ 87.252638][ T5582] [ 87.252744][ T5582] ------------[ cut here ]------------ [ 87.252750][ T5582] rrln < 0 || rrln > RCU_NEST_PMAX [ 87.252755][ T5582] WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x79/0xe0, CPU#1: udevd/5582 [ 87.252946][ T5582] Modules linked in: [ 87.253035][ T5582] CPU: 1 UID: 0 PID: 5582 Comm: udevd Not tainted syzkaller #0 PREEMPT_{RT,(full)} [ 87.253053][ T5582] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 [ 87.253063][ T5582] RIP: 0010:__rcu_read_unlock+0x79/0xe0 [ 87.253254][ T5582] Code: 75 66 41 83 3e 00 75 27 43 0f b6 04 3c 84 c0 75 41 8b 03 3d 00 00 00 40 73 0f 5b 41 5c 41 5d 41 5e 41 5f e9 49 78 75 09 cc 90 <0f> 0b 90 eb eb e8 6d 00 00 00 eb d2 89 d9 80 e1 07 80 c1 03 38 c1 [ 87.253269][ T5582] RSP: 0000:ffffc90004287ad0 EFLAGS: 00010286 [ 87.253283][ T5582] RAX: 00000000ffffffff RBX: ffff888021af04c4 RCX: 0000000000000046 [ 87.253296][ T5582] RDX: 0000000000000000 RSI: ffffffff8d860a50 RDI: ffff888021af0000 [ 87.253308][ T5582] RBP: ffffc90004287c90 R08: 0000000000000000 R09: 0000000000000000 [ 87.253319][ T5582] R10: dffffc0000000000 R11: fffffbfff1bcaadc R12: 1ffff1100435e098 [ 87.253332][ T5582] R13: ffffea00004526c0 R14: ffffc90004287be0 R15: dffffc0000000000 [ 87.253345][ T5582] FS: 00007fcb6a61b880(0000) GS:ffff88812627d000(0000) knlGS:0000000000000000 [ 87.253360][ T5582] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 87.253372][ T5582] CR2: 00005591098b5668 CR3: 0000000029cd4000 CR4: 00000000003526f0 [ 87.253389][ T5582] Call Trace: [ 87.253472][ T5582] [ 87.254256][ T5582] do_wp_page+0x2900/0x3d90 [ 87.254652][ T5582] ? rt_spin_lock+0x1e0/0x400 [ 87.255435][ T5582] ? do_wp_page+0x1823/0x3d90 [ 87.258045][ T5582] ? preempt_count_add+0x91/0x190 [ 87.258648][ T5582] ? __pfx_do_wp_page+0x10/0x10 [ 87.258818][ T5582] ? rt_spin_lock+0x2ce/0x400 [ 87.259909][ T5582] ? __pfx_rt_spin_lock+0x10/0x10 [ 87.261494][ T5582] ? pte_offset_map_rw_nolock+0xea/0x160 [ 87.262578][ T5582] handle_mm_fault+0x9f5/0x13c0 [ 87.264347][ T5582] ? handle_mm_fault+0xe7/0x13c0 [ 87.265581][ T5582] ? __pfx_handle_mm_fault+0x10/0x10 [ 87.265751][ T5582] ? lock_vma_under_rcu+0x45a/0x500 [ 87.271487][ T5582] do_user_addr_fault+0xa73/0x1340 [ 87.273407][ T5582] ? rcu_is_watching+0x15/0xb0 [ 87.274040][ T5582] ? trace_page_fault_user+0x84/0x1e0 [ 87.275118][ T5582] exc_page_fault+0x6a/0xc0 [ 87.275982][ T5582] asm_exc_page_fault+0x26/0x30 [ 87.276229][ T5582] RIP: 0033:0x559103567f2b [ 87.276396][ T5582] Code: 8d 0d 01 09 03 00 ba b0 00 00 00 48 8d 35 f5 90 02 00 48 8d 3d 2a 92 02 00 e8 c1 75 01 00 e8 9c c9 ff ff 45 31 c9 4d 8b 65 18 <4d> 89 4d 18 4c 8d 6c 24 70 e8 67 fa ff ff 31 ff e8 b0 f9 ff ff 48 [ 87.276410][ T5582] RSP: 002b:00007fff01ce56f0 EFLAGS: 00010246 [ 87.276426][ T5582] RAX: 0000000000000000 RBX: 000055910981bc80 RCX: 0000000000000000 [ 87.276438][ T5582] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 87.276448][ T5582] RBP: 00005591097b1910 R08: 00007fcb6a854b60 R09: 0000000000000000 [ 87.276459][ T5582] R10: 0000000000000008 R11: 0000000000000246 R12: 00005591097f6d00 [ 87.276471][ T5582] R13: 00005591098b5650 R14: 0000000000000000 R15: 0000000000000000 [ 87.280194][ T5582] [ 87.280206][ T5582] Kernel panic - not syncing: kernel: panic_on_warn set ... [ 87.280221][ T5582] CPU: 1 UID: 0 PID: 5582 Comm: udevd Not tainted syzkaller #0 PREEMPT_{RT,(full)} [ 87.280241][ T5582] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 [ 87.280251][ T5582] Call Trace: [ 87.280410][ T5582] [ 87.280567][ T5582] vpanic+0x56c/0xa60 [ 87.281138][ T5582] ? __pfx__printk+0x10/0x10 [ 87.281793][ T5582] ? __pfx_vpanic+0x10/0x10 [ 87.281960][ T5582] ? is_bpf_text_address+0x292/0x2b0 [ 87.282266][ T5582] ? is_bpf_text_address+0x26/0x2b0 [ 87.284466][ T5582] panic+0xc5/0xd0 [ 87.285141][ T5582] ? __pfx_panic+0x10/0x10 [ 87.289038][ T5582] __warn+0x315/0x4c0 [ 87.289344][ T5582] ? __rcu_read_unlock+0x79/0xe0 [ 87.290085][ T5582] ? __rcu_read_unlock+0x79/0xe0 [ 87.290829][ T5582] __report_bug+0x29a/0x540 [ 87.291070][ T5582] ? seqcount_lockdep_reader_access+0xd4/0x100 [ 87.292695][ T5582] ? __rcu_read_unlock+0x79/0xe0 [ 87.293312][ T5582] ? __pfx___report_bug+0x10/0x10 [ 87.293920][ T5582] ? __pfx_clockevents_program_event+0x10/0x10 [ 87.294687][ T5582] ? rcu_is_watching+0x15/0xb0 [ 87.297005][ T5582] ? __rcu_read_unlock+0x79/0xe0 [ 87.297462][ T5582] report_bug+0x16a/0x220 [ 87.298131][ T5582] ? __rcu_read_unlock+0x79/0xe0 [ 87.298304][ T5582] ? __rcu_read_unlock+0x7b/0xe0 [ 87.298608][ T5582] handle_bug+0x9c/0x200 [ 87.299276][ T5582] exc_invalid_op+0x1a/0x50 [ 87.299795][ T5582] asm_exc_invalid_op+0x1a/0x20 [ 87.300027][ T5582] RIP: 0010:__rcu_read_unlock+0x79/0xe0 [ 87.300191][ T5582] Code: 75 66 41 83 3e 00 75 27 43 0f b6 04 3c 84 c0 75 41 8b 03 3d 00 00 00 40 73 0f 5b 41 5c 41 5d 41 5e 41 5f e9 49 78 75 09 cc 90 <0f> 0b 90 eb eb e8 6d 00 00 00 eb d2 89 d9 80 e1 07 80 c1 03 38 c1 [ 87.300211][ T5582] RSP: 0000:ffffc90004287ad0 EFLAGS: 00010286 [ 87.300228][ T5582] RAX: 00000000ffffffff RBX: ffff888021af04c4 RCX: 0000000000000046 [ 87.300240][ T5582] RDX: 0000000000000000 RSI: ffffffff8d860a50 RDI: ffff888021af0000 [ 87.300250][ T5582] RBP: ffffc90004287c90 R08: 0000000000000000 R09: 0000000000000000 [ 87.300261][ T5582] R10: dffffc0000000000 R11: fffffbfff1bcaadc R12: 1ffff1100435e098 [ 87.300272][ T5582] R13: ffffea00004526c0 R14: ffffc90004287be0 R15: dffffc0000000000 [ 87.303963][ T5582] do_wp_page+0x2900/0x3d90 [ 87.304352][ T5582] ? rt_spin_lock+0x1e0/0x400 [ 87.305083][ T5582] ? do_wp_page+0x1823/0x3d90 [ 87.307551][ T5582] ? preempt_count_add+0x91/0x190 [ 87.307994][ T5582] ? __pfx_do_wp_page+0x10/0x10 [ 87.308152][ T5582] ? rt_spin_lock+0x2ce/0x400 [ 87.309177][ T5582] ? __pfx_rt_spin_lock+0x10/0x10 [ 87.310633][ T5582] ? pte_offset_map_rw_nolock+0xea/0x160 [ 87.311655][ T5582] handle_mm_fault+0x9f5/0x13c0 [ 87.313325][ T5582] ? handle_mm_fault+0xe7/0x13c0 [ 87.314492][ T5582] ? __pfx_handle_mm_fault+0x10/0x10 [ 87.314650][ T5582] ? lock_vma_under_rcu+0x45a/0x500 [ 87.319990][ T5582] do_user_addr_fault+0xa73/0x1340 [ 87.321826][ T5582] ? rcu_is_watching+0x15/0xb0 [ 87.322423][ T5582] ? trace_page_fault_user+0x84/0x1e0 [ 87.323484][ T5582] exc_page_fault+0x6a/0xc0 [ 87.324297][ T5582] asm_exc_page_fault+0x26/0x30 [ 87.324526][ T5582] RIP: 0033:0x559103567f2b [ 87.324685][ T5582] Code: 8d 0d 01 09 03 00 ba b0 00 00 00 48 8d 35 f5 90 02 00 48 8d 3d 2a 92 02 00 e8 c1 75 01 00 e8 9c c9 ff ff 45 31 c9 4d 8b 65 18 <4d> 89 4d 18 4c 8d 6c 24 70 e8 67 fa ff ff 31 ff e8 b0 f9 ff ff 48 [ 87.324698][ T5582] RSP: 002b:00007fff01ce56f0 EFLAGS: 00010246 [ 87.324712][ T5582] RAX: 0000000000000000 RBX: 000055910981bc80 RCX: 0000000000000000 [ 87.324722][ T5582] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 87.324731][ T5582] RBP: 00005591097b1910 R08: 00007fcb6a854b60 R09: 0000000000000000 [ 87.324741][ T5582] R10: 0000000000000008 R11: 0000000000000246 R12: 00005591097f6d00 [ 87.324751][ T5582] R13: 00005591098b5650 R14: 0000000000000000 R15: 0000000000000000 [ 87.328098][ T5582] [ 87.328261][ T5582] Kernel Offset: disabled