rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (1 GPs behind) idle=580c/1/0x4000000000000000 softirq=57808/57812 fqs=0
rcu: 	(t=10502 jiffies g=73949 q=701 ncpus=2)
rcu: rcu_preempt kthread starved for 10503 jiffies! g73949 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:26664 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x15ae/0x4660 kernel/sched/core.c:6701
 schedule+0xbd/0x170 kernel/sched/core.c:6775
 schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x30d/0x1590 kernel/rcu/tree.c:1667
 rcu_gp_kthread+0x9d/0x3b0 kernel/rcu/tree.c:1866
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 16540 Comm: syz.1.2960 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:27 [inline]
RIP: 0010:static_key_false include/linux/jump_label.h:207 [inline]
RIP: 0010:native_write_msr arch/x86/include/asm/msr.h:147 [inline]
RIP: 0010:wrmsr arch/x86/include/asm/msr.h:254 [inline]
RIP: 0010:native_apic_msr_write+0x39/0x50 arch/x86/include/asm/apic.h:196
Code: 74 2a 83 ff 30 74 25 eb 10 81 ff d0 00 00 00 74 1b 81 ff e0 00 00 00 74 13 c1 ef 04 81 c7 00 08 00 00 89 f9 89 f0 31 d2 0f 30 <66> 90 c3 89 f6 31 d2 e9 2b 7f 2b 03 66 2e 0f 1f 84 00 00 00 00 00
RSP: 0018:ffffc900001eee48 EFLAGS: 00000046
RAX: 0000000000000145 RBX: ffff8880b8f282c0 RCX: 0000000000000838
RDX: 0000000000000000 RSI: 0000000000000145 RDI: 0000000000000838
RBP: 0000000000000000 R08: ffffffff8e8c7caf R09: 1ffffffff1d18f95
R10: dffffc0000000000 R11: fffffbfff1d18f96 R12: dffffc0000000000
R13: 0000000010004824 R14: 0000000000000145 R15: 0000000000000020
FS:  00007fe7fef1c6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000000 CR3: 000000002fedd000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000200000000300
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 apic_write arch/x86/include/asm/apic.h:404 [inline]
 lapic_next_event+0x11/0x20 arch/x86/kernel/apic/apic.c:448
 clockevents_program_event+0x1c0/0x310 kernel/time/clockevents.c:334
 hrtimer_interrupt+0x565/0x980 kernel/time/hrtimer.c:1893
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
 __sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0x51/0xc0 arch/x86/kernel/apic/apic.c:1088
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xc0/0x120 kernel/locking/spinlock.c:194
Code: c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 41 c6 04 07 f8 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 2b 5f c6 f6 65 8b 05 9c 2d 6d 75 85 c0 74 3c 48 c7 04 24 0e 36
RSP: 0018:ffffc900001ef080 EFLAGS: 00000206
RAX: dffffc0000000004 RBX: 0000000000000a02 RCX: b81d464ffce17b00
RDX: dffffc0000000000 RSI: ffffffff8acacbe0 RDI: 0000000000000001
RBP: ffffc900001ef118 R08: ffffffff911eb5ef R09: 1ffffffff223d6bd
R10: dffffc0000000000 R11: fffffbfff223d6be R12: dffffc0000000000
R13: ffff88823b400000 R14: ffffffff8d804840 R15: 1ffff9200003de10
 __stack_depot_save+0x575/0x660 lib/stackdepot.c:439
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_set_track+0x5f/0x70 mm/kasan/common.c:53
 kasan_save_free_info+0x28/0x40 mm/kasan/generic.c:522
 ____kasan_slab_free+0x126/0x1f0 mm/kasan/common.c:237
 kasan_slab_free include/linux/kasan.h:164 [inline]
 slab_free_hook mm/slub.c:1811 [inline]
 slab_free_freelist_hook+0x130/0x1a0 mm/slub.c:1837
 slab_free mm/slub.c:3830 [inline]
 kmem_cache_free_bulk+0x357/0x470 mm/slub.c:3948
 kfree_skb_list_reason+0x3e5/0x460 net/core/skbuff.c:1154
 __dev_xmit_skb net/core/dev.c:3950 [inline]
 __dev_queue_xmit+0x1f87/0x3630 net/core/dev.c:4416
 dev_queue_xmit include/linux/netdevice.h:3115 [inline]
 hsr_xmit net/hsr/hsr_forward.c:382 [inline]
 hsr_forward_do net/hsr/hsr_forward.c:473 [inline]
 hsr_forward_skb+0x12a9/0x20b0 net/hsr/hsr_forward.c:626
 hsr_dev_xmit+0x1e7/0x350 net/hsr/hsr_device.c:238
 __netdev_start_xmit include/linux/netdevice.h:4945 [inline]
 netdev_start_xmit include/linux/netdevice.h:4959 [inline]
 xmit_one net/core/dev.c:3644 [inline]
 dev_hard_start_xmit+0x269/0x790 net/core/dev.c:3660
 __dev_queue_xmit+0x198c/0x3630 net/core/dev.c:4454
 dev_queue_xmit include/linux/netdevice.h:3115 [inline]
 br_dev_queue_push_xmit+0x6b7/0x880 net/bridge/br_forward.c:53
 NF_HOOK+0x351/0x3e0 include/linux/netfilter.h:304
 br_forward_finish+0xd3/0x130 net/bridge/br_forward.c:66
 NF_HOOK+0x351/0x3e0 include/linux/netfilter.h:304
 __br_forward+0x433/0x610 net/bridge/br_forward.c:115
 deliver_clone net/bridge/br_forward.c:131 [inline]
 maybe_deliver+0xb5/0x150 net/bridge/br_forward.c:191
 br_flood+0x317/0x670 net/bridge/br_forward.c:237
 br_dev_xmit+0x10f3/0x18a0 net/bridge/br_device.c:-1
 __netdev_start_xmit include/linux/netdevice.h:4945 [inline]
 netdev_start_xmit include/linux/netdevice.h:4959 [inline]
 xmit_one net/core/dev.c:3644 [inline]
 dev_hard_start_xmit+0x269/0x790 net/core/dev.c:3660
 __dev_queue_xmit+0x198c/0x3630 net/core/dev.c:4454
 dev_queue_xmit include/linux/netdevice.h:3115 [inline]
 neigh_hh_output include/net/neighbour.h:527 [inline]
 neigh_output include/net/neighbour.h:541 [inline]
 ip6_finish_output2+0xdf7/0x1620 net/ipv6/ip6_output.c:141
 dst_output include/net/dst.h:467 [inline]
 NF_HOOK include/linux/netfilter.h:304 [inline]
 ndisc_send_skb+0xbb9/0x1480 net/ipv6/ndisc.c:513
 addrconf_rs_timer+0x36b/0x640 net/ipv6/addrconf.c:4036
 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x570/0x810 kernel/time/timer.c:2023
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
 handle_softirqs+0x27d/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:preempt_schedule_irq+0xba/0x150 kernel/sched/core.c:7011
Code: 00 00 43 c6 44 37 04 f8 74 0b 0f 0b 48 f7 03 08 00 00 00 74 6f bf 01 00 00 00 e8 e1 c2 c7 f6 e8 2c bd f8 f6 fb bf 01 00 00 00 <e8> 31 b4 ff ff 43 c6 44 37 08 00 48 c7 44 24 40 00 00 00 00 9c 8f
RSP: 0018:ffffc9000caffda0 EFLAGS: 00000286
RAX: b81d464ffce17b00 RBX: 0000000000000000 RCX: b81d464ffce17b00
RDX: dffffc0000000000 RSI: ffffffff8acacbe0 RDI: 0000000000000001
RBP: ffffc9000caffe40 R08: ffffffff8e8c7caf R09: 1ffffffff1d18f95
R10: dffffc0000000000 R11: fffffbfff1d18f96 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff9200195ffb4
 irqentry_exit+0x67/0x70 kernel/entry/common.c:438
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__syscall_enter_from_user_work kernel/entry/common.c:97 [inline]
RIP: 0010:syscall_enter_from_user_mode+0x2e/0x80 kernel/entry/common.c:118
Code: 41 56 53 48 89 f3 49 89 fe 48 8b 7c 24 10 e8 e9 fa ff ff 66 90 66 90 e8 a0 06 01 f7 e8 5b 06 01 f7 fb 65 48 8b 05 12 dc 76 75 <48> 8b 70 08 40 f6 c6 3f 74 0b 4c 89 f7 5b 41 5e e9 1d 46 e7 f6 48
RSP: 0018:ffffc9000cafff08 EFLAGS: 00000286
RAX: ffff888068a65a00 RBX: 00000000000000ca RCX: b81d464ffce17b00
RDX: dffffc0000000000 RSI: ffffffff8acacbe0 RDI: ffffffff8b1d0660
RBP: ffffc9000cafff48 R08: ffffffff8e8c7caf R09: 1ffffffff1d18f95
R10: dffffc0000000000 R11: fffffbfff1d18f96 R12: 0000000000000000
R13: 0000000000000000 R14: ffffc9000cafff58 R15: 0000000000000000
 do_syscall_64+0x28/0xb0 arch/x86/entry/common.c:72
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fe7fdf9de99
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe7fef1c0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fe7fe225fa8 RCX: 00007fe7fdf9de99
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fe7fe225fac
RBP: 00007fe7fe225fa0 R08: 0000000000745aed R09: 0000000000000000
R10: 000000000000000b R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe7fe226038 R14: 00007fff999e16e0 R15: 00007fff999e17c8
 </TASK>
CPU: 0 PID: 16542 Comm: syz.1.2960 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xc0/0x120 kernel/locking/spinlock.c:194
Code: c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 41 c6 04 07 f8 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 2b 5f c6 f6 65 8b 05 9c 2d 6d 75 85 c0 74 3c 48 c7 04 24 0e 36
RSP: 0018:ffffc900000079e0 EFLAGS: 00000206
RAX: dffffc0000000004 RBX: 0000000000000a06 RCX: 23129feacabe1e00
RDX: dffffc0000000000 RSI: ffffffff8acacbe0 RDI: 0000000000000001
RBP: ffffc90000007a70 R08: ffffffff911eb597 R09: 1ffffffff223d6b2
R10: dffffc0000000000 R11: fffffbfff223d6b3 R12: dffffc0000000000
R13: ffff88802c5dcd58 R14: ffffffff975923d8 R15: 1ffff92000000f3c
FS:  00007fe7feefb6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000001 CR3: 000000002fedd000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 debug_object_assert_init+0x1f1/0x300 lib/debugobjects.c:946
 debug_timer_assert_init kernel/time/timer.c:792 [inline]
 debug_assert_init kernel/time/timer.c:837 [inline]
 __mod_timer+0x55/0xd60 kernel/time/timer.c:1020
 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x570/0x810 kernel/time/timer.c:2023
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
 handle_softirqs+0x27d/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:preempt_schedule+0x0/0xd0 kernel/sched/core.c:6885
Code: 4c 89 f7 e8 52 d0 4a f7 eb af 66 0f 1f 00 bf 01 00 00 00 e8 e2 c7 c7 f6 e8 fd fd ff ff bf 01 00 00 00 e8 33 c6 c7 f6 c3 66 90 <f3> 0f 1e fa 55 48 89 e5 41 56 53 48 83 e4 e0 48 83 ec 60 65 48 8b
RSP: 0018:ffffc9000cab7c98 EFLAGS: 00000293
RAX: ffffffff81f6f172 RBX: 0000000000000000 RCX: ffff888076e73c00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000cab7ce8 R08: ffffffff8e8c7caf R09: 1ffffffff1d18f95
R10: dffffc0000000000 R11: fffffbfff1d18f96 R12: ffff88803639e060
R13: ffff88803639e060 R14: ffffffff81f6ee40 R15: 1ffff11008404791
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
 rcu_read_unlock_sched include/linux/rcupdate.h:901 [inline]
 fd_install+0x397/0x4e0 fs/file.c:611
 __do_sys_perf_event_open kernel/events/core.c:12970 [inline]
 __se_sys_perf_event_open+0x19fe/0x1c60 kernel/events/core.c:12601
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fe7fdf9de99
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe7feefb028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007fe7fe226090 RCX: 00007fe7fdf9de99
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 00002000000012c0
RBP: 00007fe7fe033eaf R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe7fe226128 R14: 00007fe7fe226090 R15: 00007fff999e17c8
 </TASK>