last executing test programs:
kernel console output (not intermixed with test programs):
Warning: Permanently added '10.128.1.44' (ED25519) to the list of known hosts.
[ 91.440252][ T5814] cgroup: Unknown subsys name 'net'
[ 91.707911][ T5814] cgroup: Unknown subsys name 'cpuset'
[ 91.763211][ T5814] cgroup: Unknown subsys name 'rlimit'
[ 91.920530][ T37] cfg80211: failed to load regulatory.db
[ 91.932090][ T5197]
[ 91.932102][ T5197] ================================================
[ 91.932110][ T5197] WARNING: lock held when returning to user space!
[ 91.932110][ T5197] WARNING: lock held when returning to user space!
[ 91.932137][ T5197] syzkaller #0 Not tainted
[ 91.932148][ T5197] ------------------------------------------------
[ 91.932156][ T5197] udevd/5197 is leaving the kernel with locks still held!
[ 91.932169][ T5197] 1 lock held by udevd/5197:
[ 91.932181][ T5197] #0: ffffffff8dfc81c0 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x29/0x200
[ 91.932266][ T5197] BUG: sleeping function called from invalid context at ./include/linux/sched/mm.h:323
[ 91.932292][ T5197] in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 5197, name: udevd
[ 91.932309][ T5197] preempt_count: 0, expected: 0
[ 91.932319][ T5197] RCU nest depth: 1, expected: 0
[ 91.932328][ T5197] INFO: lockdep is turned off.
[ 91.932351][ T5197] CPU: 0 UID: 0 PID: 5197 Comm: udevd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
[ 91.932374][ T5197] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
[ 91.932392][ T5197] Call Trace:
[ 91.932401][ T5197]
[ 91.932408][ T5197] dump_stack_lvl+0xe8/0x150
[ 91.932429][ T5197] __might_resched+0x329/0x480
[ 91.932450][ T5197] prepare_alloc_pages+0x1f0/0x6b0
[ 91.932486][ T5197] __alloc_frozen_pages_noprof+0x12f/0x380
[ 91.932505][ T5197] ? __pfx___alloc_frozen_pages_noprof+0x10/0x10
[ 91.932523][ T5197] ? __pfx_policy_nodemask+0x10/0x10
[ 91.932559][ T5197] ? rcu_is_watching+0x15/0xb0
[ 91.932589][ T5197] alloc_pages_mpol+0xd1/0x380
[ 91.932616][ T5197] folio_alloc_mpol_noprof+0x3b/0x1e0
[ 91.932645][ T5197] vma_alloc_folio_noprof+0xe1/0x1e0
[ 91.932673][ T5197] ? __pfx_vma_alloc_folio_noprof+0x10/0x10
[ 91.932701][ T5197] ? lock_release+0x4b/0x3c0
[ 91.932726][ T5197] do_wp_page+0x1109/0x3d90
[ 91.932755][ T5197] ? preempt_count_add+0x91/0x190
[ 91.932773][ T5197] ? __pfx_do_wp_page+0x10/0x10
[ 91.932794][ T5197] ? rt_spin_lock+0x2ce/0x400
[ 91.932816][ T5197] ? __pfx_rt_spin_lock+0x10/0x10
[ 91.932834][ T5197] ? __pte_offset_map+0x45/0x200
[ 91.932858][ T5197] ? pte_offset_map_rw_nolock+0xea/0x160
[ 91.932882][ T5197] handle_mm_fault+0xaee/0x14c0
[ 91.932908][ T5197] ? handle_mm_fault+0xed/0x14c0
[ 91.932934][ T5197] ? __pfx_handle_mm_fault+0x10/0x10
[ 91.932957][ T5197] ? lock_vma_under_rcu+0x45a/0x500
[ 91.932990][ T5197] ? rcu_is_watching+0x15/0xb0
[ 91.933017][ T5197] do_user_addr_fault+0xa73/0x1340
[ 91.933039][ T5197] ? rcu_is_watching+0x15/0xb0
[ 91.933063][ T5197] ? trace_page_fault_user+0x84/0x1e0
[ 91.933083][ T5197] exc_page_fault+0x6a/0xc0
[ 91.933108][ T5197] asm_exc_page_fault+0x26/0x30
[ 91.933124][ T5197] RIP: 0033:0x7f1302cf78c1
[ 91.933147][ T5197] Code: 66 85 c9 74 64 48 8d 7d 10 48 8b 04 fa a8 0f 0f 85 44 02 00 00 48 89 c6 83 e9 01 48 c1 ee 0c 48 33 30 48 89 34 fa 66 89 0c 6a <48> c7 40 08 00 00 00 00 48 83 c4 10 5b 5d 41 5c c3 66 0f 1f 44 00
[ 91.933161][ T5197] RSP: 002b:00007ffddd9442b0 EFLAGS: 00010206
[ 91.933176][ T5197] RAX: 000055adf2e9bca0 RBX: 0000000000000200 RCX: 0000000000000002
[ 91.933187][ T5197] RDX: 000055adf2d14010 RSI: 000055adf2d25d60 RDI: 000000000000002f
[ 91.933217][ T5197] RBP: 000000000000001f R08: 0000000000000007 R09: 0000000000000000
[ 91.933228][ T5197] R10: 000055adf2d14010 R11: 00007f1302e2fac0 R12: fffffffffffffea0
[ 91.933241][ T5197] R13: 000055adf2d34cf0 R14: 0000000000000001 R15: 000055adf2d26de0
[ 91.933260][ T5197]
[ 91.938084][ T5197] ------------[ cut here ]------------
[ 91.938122][ T5197] Voluntary context switch within RCU read-side critical section!
[ 91.938153][ T5197] WARNING: kernel/rcu/tree_plugin.h:332 at rcu_note_context_switch+0xcac/0xf40, CPU#0: udevd/5197
[ 91.938281][ T5197] Modules linked in:
[ 91.938345][ T5197] CPU: 0 UID: 0 PID: 5197 Comm: udevd Tainted: G W syzkaller #0 PREEMPT_{RT,(full)}
[ 91.938425][ T5197] Tainted: [W]=WARN
[ 91.938468][ T5197] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
[ 91.938505][ T5197] RIP: 0010:rcu_note_context_switch+0xcac/0xf40
[ 91.938573][ T5197] Code: 00 41 c6 45 00 00 48 8b 3d a1 ab e2 0d 48 81 c4 b8 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d e9 9b 60 ff ff 48 8d 3d e4 75 e6 0d <67> 48 0f b9 3a e9 1b f4 ff ff 90 0f 0b 90 45 84 e4 0f 84 ea f3 ff
[ 91.938626][ T5197] RSP: 0018:ffffc90002fc77b0 EFLAGS: 00010002
[ 91.938680][ T5197] RAX: 0000000000000000 RBX: ffff888039379ec0 RCX: 0000000080000002
[ 91.938734][ T5197] RDX: 0000000000000000 RSI: ffffffff8ba85ec0 RDI: ffffffff8f90d870
[ 91.938798][ T5197] RBP: dffffc0000000000 R08: ffffffff8f8d60f7 R09: 1ffffffff1f1ac1e
[ 91.938856][ T5197] R10: dffffc0000000000 R11: fffffbfff1f1ac1f R12: 0000000000000000
[ 91.938900][ T5197] R13: ffff888039379ec0 R14: ffff8880b863c980 R15: ffff88803937a384
[ 91.938943][ T5197] FS: 00007f1302bf7880(0000) GS:ffff888125eb0000(0000) knlGS:0000000000000000
[ 91.938997][ T5197] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 91.939041][ T5197] CR2: 000055adcb5df048 CR3: 0000000039028000 CR4: 00000000003526f0
[ 91.939085][ T5197] Call Trace:
[ 91.939106][ T5197]
[ 91.939130][ T5197] ? rtlock_slowlock_locked+0xfb/0x3c80
[ 91.939213][ T5197] ? unwind_next_frame+0xa6/0x2550
[ 91.939294][ T5197] ? rcu_is_watching+0x15/0xb0
[ 91.939385][ T5197] ? unwind_next_frame+0xa6/0x2550
[ 91.939447][ T5197] ? rcu_is_watching+0x15/0xb0
[ 91.939540][ T5197] ? rcu_is_watching+0x15/0xb0
[ 91.939631][ T5197] __schedule+0x297/0x54f0
[ 91.939723][ T5197] ? do_raw_spin_lock+0x12b/0x2f0
[ 91.939777][ T5197] ? rcu_is_watching+0x15/0xb0
[ 91.939868][ T5197] ? do_raw_spin_unlock+0xf5/0x210
[ 91.939952][ T5197] ? __pfx___schedule+0x10/0x10
[ 91.940030][ T5197] ? schedule+0x90/0x360
[ 91.940123][ T5197] ? rcu_is_watching+0x15/0xb0
[ 91.940232][ T5197] ? rcu_is_watching+0x15/0xb0
[ 91.940321][ T5197] ? lock_release+0x4b/0x3c0
[ 91.940411][ T5197] schedule+0x164/0x360
[ 91.940503][ T5197] schedule_hrtimeout_range_clock+0x15b/0x330
[ 91.940594][ T5197] ? rcu_is_watching+0x15/0xb0
[ 91.940688][ T5197] ? __pfx_schedule_hrtimeout_range_clock+0x10/0x10
[ 91.940773][ T5197] ? rcu_is_watching+0x15/0xb0
[ 91.940865][ T5197] ? __pfx_hrtimer_wakeup+0x10/0x10
[ 91.940933][ T5197] ? ktime_get+0x45/0x220
[ 91.941001][ T5197] ? ktime_get+0x45/0x220
[ 91.941069][ T5197] ? ktime_get+0x1f5/0x220
[ 91.941138][ T5197] do_epoll_wait+0xa7a/0xbd0
[ 91.941245][ T5197] ? do_epoll_wait+0x6c5/0xbd0
[ 91.941331][ T5197] ? __pfx_do_epoll_wait+0x10/0x10
[ 91.941414][ T5197] ? seqcount_lockdep_reader_access+0xea/0x100
[ 91.941499][ T5197] ? __pfx_ep_autoremove_wake_function+0x10/0x10
[ 91.941636][ T5197] __x64_sys_epoll_wait+0x1d7/0x230
[ 91.941721][ T5197] ? __pfx___x64_sys_epoll_wait+0x10/0x10
[ 91.941817][ T5197] ? rcu_is_watching+0x15/0xb0
[ 91.941903][ T5197] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 91.941965][ T5197] do_syscall_64+0x15f/0xf80
[ 91.942043][ T5197] ? trace_irq_disable+0x3b/0x140
[ 91.942108][ T5197] ? clear_bhb_loop+0x40/0x90
[ 91.942173][ T5197] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 91.942226][ T5197] RIP: 0033:0x7f1302ce5407
[ 91.942263][ T5197] Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
[ 91.942314][ T5197] RSP: 002b:00007ffddd944320 EFLAGS: 00000202 ORIG_RAX: 00000000000000e8
[ 91.942359][ T5197] RAX: ffffffffffffffda RBX: 00007f1302bf7880 RCX: 00007f1302ce5407
[ 91.942374][ T5197] RDX: 0000000000000008 RSI: 00007ffddd944480 RDI: 000000000000000b
[ 91.942394][ T5197] RBP: 000055adf2eceaa0 R08: 0000000000000000 R09: 0000000000000000
[ 91.942447][ T5197] R10: 0000000000000bb8 R11: 0000000000000202 R12: 0000000000000000
[ 91.942501][ T5197] R13: 000055adcb5df100 R14: 0000000000000000 R15: 0000000000000000
[ 91.942544][ T5197]
[ 91.942554][ T5197] Kernel panic - not syncing: kernel: panic_on_warn set ...
[ 91.942571][ T5197] CPU: 0 UID: 0 PID: 5197 Comm: udevd Tainted: G W syzkaller #0 PREEMPT_{RT,(full)}
[ 91.942598][ T5197] Tainted: [W]=WARN
[ 91.942605][ T5197] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
[ 91.942616][ T5197] Call Trace:
[ 91.942624][ T5197]
[ 91.942655][ T5197] vpanic+0x56c/0xa60
[ 91.942731][ T5197] ? __pfx__printk+0x10/0x10
[ 91.942806][ T5197] ? __pfx_vpanic+0x10/0x10
[ 91.942870][ T5197] ? is_bpf_text_address+0x292/0x2b0
[ 91.942946][ T5197] ? is_bpf_text_address+0x26/0x2b0
[ 91.943053][ T5197] panic+0xc5/0xd0
[ 91.943104][ T5197] ? __pfx_panic+0x10/0x10
[ 91.943200][ T5197] __warn+0x315/0x4c0
[ 91.943270][ T5197] ? rcu_note_context_switch+0xcac/0xf40
[ 91.943348][ T5197] ? rcu_note_context_switch+0xcac/0xf40
[ 91.943424][ T5197] __report_bug+0x29a/0x540
[ 91.943530][ T5197] ? rcu_note_context_switch+0xcac/0xf40
[ 91.943599][ T5197] ? __pfx___report_bug+0x10/0x10
[ 91.943710][ T5197] report_bug_entry+0x19a/0x290
[ 91.943790][ T5197] ? rcu_note_context_switch+0xcac/0xf40
[ 91.943845][ T5197] ? rcu_note_context_switch+0xcb1/0xf40
[ 91.943906][ T5197] handle_bug+0xce/0x200
[ 91.943985][ T5197] exc_invalid_op+0x1a/0x50
[ 91.944051][ T5197] asm_exc_invalid_op+0x1a/0x20
[ 91.944108][ T5197] RIP: 0010:rcu_note_context_switch+0xcac/0xf40
[ 91.944194][ T5197] Code: 00 41 c6 45 00 00 48 8b 3d a1 ab e2 0d 48 81 c4 b8 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d e9 9b 60 ff ff 48 8d 3d e4 75 e6 0d <67> 48 0f b9 3a e9 1b f4 ff ff 90 0f 0b 90 45 84 e4 0f 84 ea f3 ff
[ 91.944240][ T5197] RSP: 0018:ffffc90002fc77b0 EFLAGS: 00010002
[ 91.944286][ T5197] RAX: 0000000000000000 RBX: ffff888039379ec0 RCX: 0000000080000002
[ 91.944330][ T5197] RDX: 0000000000000000 RSI: ffffffff8ba85ec0 RDI: ffffffff8f90d870
[ 91.944374][ T5197] RBP: dffffc0000000000 R08: ffffffff8f8d60f7 R09: 1ffffffff1f1ac1e
[ 91.944418][ T5197] R10: dffffc0000000000 R11: fffffbfff1f1ac1f R12: 0000000000000000
[ 91.944468][ T5197] R13: ffff888039379ec0 R14: ffff8880b863c980 R15: ffff88803937a384
[ 91.944544][ T5197] ? rtlock_slowlock_locked+0xfb/0x3c80
[ 91.944621][ T5197] ? unwind_next_frame+0xa6/0x2550
[ 91.944697][ T5197] ? rcu_is_watching+0x15/0xb0
[ 91.944785][ T5197] ? unwind_next_frame+0xa6/0x2550
[ 91.944853][ T5197] ? rcu_is_watching+0x15/0xb0
[ 91.944948][ T5197] ? rcu_is_watching+0x15/0xb0
[ 91.945040][ T5197] __schedule+0x297/0x54f0
[ 91.945132][ T5197] ? do_raw_spin_lock+0x12b/0x2f0
[ 91.945199][ T5197] ? rcu_is_watching+0x15/0xb0
[ 91.945327][ T5197] ? do_raw_spin_unlock+0xf5/0x210
[ 91.945427][ T5197] ? __pfx___schedule+0x10/0x10
[ 91.945512][ T5197] ? schedule+0x90/0x360
[ 91.945604][ T5197] ? rcu_is_watching+0x15/0xb0
[ 91.945691][ T5197] ? rcu_is_watching+0x15/0xb0
[ 91.945774][ T5197] ? lock_release+0x4b/0x3c0
[ 91.945853][ T5197] schedule+0x164/0x360
[ 91.945932][ T5197] schedule_hrtimeout_range_clock+0x15b/0x330
[ 91.946036][ T5197] ? rcu_is_watching+0x15/0xb0
[ 91.946127][ T5197] ? __pfx_schedule_hrtimeout_range_clock+0x10/0x10
[ 91.946209][ T5197] ? rcu_is_watching+0x15/0xb0
[ 91.946308][ T5197] ? __pfx_hrtimer_wakeup+0x10/0x10
[ 91.946374][ T5197] ? ktime_get+0x45/0x220
[ 91.946432][ T5197] ? ktime_get+0x45/0x220
[ 91.946492][ T5197] ? ktime_get+0x1f5/0x220
[ 91.946566][ T5197] do_epoll_wait+0xa7a/0xbd0
[ 91.946690][ T5197] ? do_epoll_wait+0x6c5/0xbd0
[ 91.946810][ T5197] ? __pfx_do_epoll_wait+0x10/0x10
[ 91.946896][ T5197] ? seqcount_lockdep_reader_access+0xea/0x100
[ 91.946973][ T5197] ? __pfx_ep_autoremove_wake_function+0x10/0x10
[ 91.947092][ T5197] __x64_sys_epoll_wait+0x1d7/0x230
[ 91.947181][ T5197] ? __pfx___x64_sys_epoll_wait+0x10/0x10
[ 91.947269][ T5197] ? rcu_is_watching+0x15/0xb0
[ 91.947358][ T5197] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 91.947428][ T5197] do_syscall_64+0x15f/0xf80
[ 91.947522][ T5197] ? trace_irq_disable+0x3b/0x140
[ 91.947602][ T5197] ? clear_bhb_loop+0x40/0x90
[ 91.947669][ T5197] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 91.947726][ T5197] RIP: 0033:0x7f1302ce5407
[ 91.947781][ T5197] Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
[ 91.947837][ T5197] RSP: 002b:00007ffddd944320 EFLAGS: 00000202 ORIG_RAX: 00000000000000e8
[ 91.947902][ T5197] RAX: ffffffffffffffda RBX: 00007f1302bf7880 RCX: 00007f1302ce5407
[ 91.947947][ T5197] RDX: 0000000000000008 RSI: 00007ffddd944480 RDI: 000000000000000b
[ 91.947982][ T5197] RBP: 000055adf2eceaa0 R08: 0000000000000000 R09: 0000000000000000
[ 91.948041][ T5197] R10: 0000000000000bb8 R11: 0000000000000202 R12: 0000000000000000
[ 91.948090][ T5197] R13: 000055adcb5df100 R14: 0000000000000000 R15: 0000000000000000
[ 91.948148][ T5197]
[ 91.948765][ T5197] Kernel Offset: disabled