last executing test programs:
kernel console output (not intermixed with test programs):
Warning: Permanently added '10.128.0.250' (ED25519) to the list of known hosts.
[ 91.449155][ T5583] cgroup: Unknown subsys name 'net'
[ 91.675076][ T5583] cgroup: Unknown subsys name 'cpuset'
[ 91.723485][ T5583] cgroup: Unknown subsys name 'rlimit'
[ 91.880086][ T9] cfg80211: failed to load regulatory.db
[ 91.892579][ T4966]
[ 91.892591][ T4966] ================================================
[ 91.892600][ T4966] WARNING: lock held when returning to user space!
[ 91.892618][ T4966] syzkaller #0 Not tainted
[ 91.892628][ T4966] ------------------------------------------------
[ 91.892641][ T4966] udevd/4966 is leaving the kernel with locks still held!
[ 91.892657][ T4966] 1 lock held by udevd/4966:
[ 91.892669][ T4966] #0: ffffffff8dfc8140 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x29/0x200
[ 91.892794][ T4966] ------------[ cut here ]------------
[ 91.892802][ T4966] Voluntary context switch within RCU read-side critical section!
[ 91.892813][ T4966] WARNING: kernel/rcu/tree_plugin.h:332 at rcu_note_context_switch+0xcac/0xf40, CPU#1: udevd/4966
[ 91.892853][ T4966] Modules linked in:
[ 91.892883][ T4966] CPU: 1 UID: 0 PID: 4966 Comm: udevd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
[ 91.892903][ T4966] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
[ 91.892916][ T4966] RIP: 0010:rcu_note_context_switch+0xcac/0xf40
[ 91.892938][ T4966] Code: 00 41 c6 45 00 00 48 8b 3d c1 52 de 0d 48 81 c4 b8 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d e9 bb 5f ff ff 48 8d 3d 84 13 e2 0d <67> 48 0f b9 3a e9 1b f4 ff ff 90 0f 0b 90 45 84 e4 0f 84 ea f3 ff
[ 91.892953][ T4966] RSP: 0000:ffffc90003b07b90 EFLAGS: 00010002
[ 91.892967][ T4966] RAX: 0000000000000000 RBX: ffff8880381b5c40 RCX: 0000000000000002
[ 91.892978][ T4966] RDX: 0000000000000000 RSI: ffffffff8ba74c40 RDI: ffffffff8f8c4110
[ 91.892990][ T4966] RBP: dffffc0000000000 R08: ffffffff8f88d2f7 R09: 1ffffffff1f11a5e
[ 91.893002][ T4966] R10: dffffc0000000000 R11: fffffbfff1f11a5f R12: 0000000000000000
[ 91.893014][ T4966] R13: dffffc0000000000 R14: ffff8880b893c800 R15: ffff8880381b6104
[ 91.893027][ T4966] FS: 00007f175e59e880(0000) GS:ffff88812627c000(0000) knlGS:0000000000000000
[ 91.893041][ T4966] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 91.893053][ T4966] CR2: 000055db9d6aca58 CR3: 0000000038f02000 CR4: 00000000003526f0
[ 91.893067][ T4966] Call Trace:
[ 91.893073][ T4966]
[ 91.893081][ T4966] ? rcu_is_watching+0x15/0xb0
[ 91.893108][ T4966] ? do_raw_spin_unlock+0xf5/0x210
[ 91.893130][ T4966] ? rcu_is_watching+0x15/0xb0
[ 91.893157][ T4966] __schedule+0x291/0x54c0
[ 91.893181][ T4966] ? sched_clock+0x3f/0x60
[ 91.893197][ T4966] ? psi_group_change+0xab8/0x1050
[ 91.893215][ T4966] ? rcu_is_watching+0x15/0xb0
[ 91.893240][ T4966] ? __pfx___resched_curr+0x10/0x10
[ 91.893265][ T4966] ? __pfx___schedule+0x10/0x10
[ 91.893287][ T4966] ? rcu_is_watching+0x15/0xb0
[ 91.893314][ T4966] ? preempt_schedule_notrace_thunk+0x16/0x30
[ 91.893355][ T4966] schedule+0x164/0x360
[ 91.893379][ T4966] irqentry_exit+0x263/0x730
[ 91.893396][ T4966] asm_sysvec_apic_timer_interrupt+0x1a/0x20
[ 91.893414][ T4966] RIP: 0033:0x7f175e69dc3b
[ 91.893431][ T4966] Code: 83 c5 6e 4c 39 fa 0f 85 1c f6 ff ff e9 f6 f9 ff ff 66 0f 1f 44 00 00 48 8d 3d 42 95 0f 00 e8 5c c6 ff ff 48 8d 05 85 8e 13 00 <4b> 83 4c 35 08 01 48 39 c5 0f 84 49 ff ff ff 49 83 4d 08 04 e9 3f
[ 91.893445][ T4966] RSP: 002b:00007ffd6c468110 EFLAGS: 00010293
[ 91.893458][ T4966] RAX: 00007f175e7d6ac0 RBX: 0000000000000020 RCX: 0000000000000010
[ 91.893468][ T4966] RDX: 000055db9d6b51d0 RSI: 00007f175e7d6b40 RDI: 000055db9d6aca20
[ 91.893480][ T4966] RBP: 00007f175e7d6ac0 R08: 00007f175e7d6ac0 R09: 0000000000000020
[ 91.893491][ T4966] R10: 0000000000000000 R11: 0000000000000003 R12: 0000000000000011
[ 91.893500][ T4966] R13: 000055db9d6aca20 R14: 0000000000000030 R15: 00007f175e7d6b20
[ 91.893518][ T4966]
[ 91.893526][ T4966] Kernel panic - not syncing: kernel: panic_on_warn set ...
[ 91.893540][ T4966] CPU: 1 UID: 0 PID: 4966 Comm: udevd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
[ 91.893558][ T4966] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
[ 91.893568][ T4966] Call Trace:
[ 91.893573][ T4966]
[ 91.893579][ T4966] vpanic+0x56c/0xa60
[ 91.893599][ T4966] ? __pfx__printk+0x10/0x10
[ 91.893640][ T4966] ? __pfx_vpanic+0x10/0x10
[ 91.893660][ T4966] ? is_bpf_text_address+0x292/0x2b0
[ 91.893696][ T4966] ? is_bpf_text_address+0x26/0x2b0
[ 91.893720][ T4966] panic+0xc5/0xd0
[ 91.893739][ T4966] ? __pfx_panic+0x10/0x10
[ 91.893764][ T4966] __warn+0x315/0x4c0
[ 91.893783][ T4966] ? rcu_note_context_switch+0xcac/0xf40
[ 91.893803][ T4966] ? rcu_note_context_switch+0xcac/0xf40
[ 91.893822][ T4966] __report_bug+0x29a/0x540
[ 91.893849][ T4966] ? rcu_note_context_switch+0xcac/0xf40
[ 91.893868][ T4966] ? __pfx___report_bug+0x10/0x10
[ 91.893903][ T4966] ? update_cfs_rq_load_avg+0x3fb/0x4e0
[ 91.893929][ T4966] report_bug_entry+0x19a/0x290
[ 91.893954][ T4966] ? rcu_note_context_switch+0xcac/0xf40
[ 91.893973][ T4966] ? rcu_note_context_switch+0xcb1/0xf40
[ 91.893991][ T4966] handle_bug+0xce/0x200
[ 91.894009][ T4966] exc_invalid_op+0x1a/0x50
[ 91.894026][ T4966] asm_exc_invalid_op+0x1a/0x20
[ 91.894042][ T4966] RIP: 0010:rcu_note_context_switch+0xcac/0xf40
[ 91.894062][ T4966] Code: 00 41 c6 45 00 00 48 8b 3d c1 52 de 0d 48 81 c4 b8 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d e9 bb 5f ff ff 48 8d 3d 84 13 e2 0d <67> 48 0f b9 3a e9 1b f4 ff ff 90 0f 0b 90 45 84 e4 0f 84 ea f3 ff
[ 91.894075][ T4966] RSP: 0000:ffffc90003b07b90 EFLAGS: 00010002
[ 91.894088][ T4966] RAX: 0000000000000000 RBX: ffff8880381b5c40 RCX: 0000000000000002
[ 91.894099][ T4966] RDX: 0000000000000000 RSI: ffffffff8ba74c40 RDI: ffffffff8f8c4110
[ 91.894110][ T4966] RBP: dffffc0000000000 R08: ffffffff8f88d2f7 R09: 1ffffffff1f11a5e
[ 91.894123][ T4966] R10: dffffc0000000000 R11: fffffbfff1f11a5f R12: 0000000000000000
[ 91.894136][ T4966] R13: dffffc0000000000 R14: ffff8880b893c800 R15: ffff8880381b6104
[ 91.894155][ T4966] ? rcu_is_watching+0x15/0xb0
[ 91.894181][ T4966] ? do_raw_spin_unlock+0xf5/0x210
[ 91.894200][ T4966] ? rcu_is_watching+0x15/0xb0
[ 91.894225][ T4966] __schedule+0x291/0x54c0
[ 91.894248][ T4966] ? sched_clock+0x3f/0x60
[ 91.894262][ T4966] ? psi_group_change+0xab8/0x1050
[ 91.894298][ T4966] ? rcu_is_watching+0x15/0xb0
[ 91.894322][ T4966] ? __pfx___resched_curr+0x10/0x10
[ 91.894347][ T4966] ? __pfx___schedule+0x10/0x10
[ 91.894370][ T4966] ? rcu_is_watching+0x15/0xb0
[ 91.894397][ T4966] ? preempt_schedule_notrace_thunk+0x16/0x30
[ 91.894425][ T4966] schedule+0x164/0x360
[ 91.894450][ T4966] irqentry_exit+0x263/0x730
[ 91.894468][ T4966] asm_sysvec_apic_timer_interrupt+0x1a/0x20
[ 91.894486][ T4966] RIP: 0033:0x7f175e69dc3b
[ 91.894499][ T4966] Code: 83 c5 6e 4c 39 fa 0f 85 1c f6 ff ff e9 f6 f9 ff ff 66 0f 1f 44 00 00 48 8d 3d 42 95 0f 00 e8 5c c6 ff ff 48 8d 05 85 8e 13 00 <4b> 83 4c 35 08 01 48 39 c5 0f 84 49 ff ff ff 49 83 4d 08 04 e9 3f
[ 91.894512][ T4966] RSP: 002b:00007ffd6c468110 EFLAGS: 00010293
[ 91.894526][ T4966] RAX: 00007f175e7d6ac0 RBX: 0000000000000020 RCX: 0000000000000010
[ 91.894537][ T4966] RDX: 000055db9d6b51d0 RSI: 00007f175e7d6b40 RDI: 000055db9d6aca20
[ 91.894549][ T4966] RBP: 00007f175e7d6ac0 R08: 00007f175e7d6ac0 R09: 0000000000000020
[ 91.894560][ T4966] R10: 0000000000000000 R11: 0000000000000003 R12: 0000000000000011
[ 91.894570][ T4966] R13: 000055db9d6aca20 R14: 0000000000000030 R15: 00007f175e7d6b20
[ 91.894588][ T4966]
[ 91.895184][ T4966] Kernel Offset: disabled