rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (7 ticks this GP) idle=e85/1/0x4000000000000002 softirq=46650/46650 fqs=0 
	(detected by 1, t=10502 jiffies, g=60809, q=1428)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 16992 Comm: syz.5.3353 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:apic_eoi arch/x86/include/asm/apic.h:400 [inline]
RIP: 0010:ack_APIC_irq arch/x86/include/asm/apic.h:446 [inline]
RIP: 0010:__sysvec_irq_work+0x2b/0x240 arch/x86/kernel/irq_work.c:19
Code: 56 53 49 be 00 00 00 00 00 fc ff df 48 c7 c0 e8 0b bc 8b 48 c1 e8 03 42 80 3c 30 00 74 0c 48 c7 c7 e8 0b bc 8b e8 c5 e4 91 00 <48> 8b 1d f6 bb 91 0a 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48
RSP: 0018:ffffc900000076c8 EFLAGS: 00000046
RAX: 1ffffffff177817d RBX: ffffc900000076f8 RCX: 821f4e927d6e6100
RDX: 1ffffffff1dd7e00 RSI: ffffffff8a59e7e0 RDI: ffffffff8a59e7a0
RBP: 0000000000000000 R08: ffffffff8eebf008 R09: ffffffff8eebf018
R10: ffffffff8eebf010 R11: ffffffff8eebf003 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007fb966df26c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb966db0d58 CR3: 0000000078803000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline]
 sysvec_irq_work+0x4a/0xc0 arch/x86/kernel/irq_work.c:17
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713
RIP: 0010:rcu_read_unlock_special+0x84/0x480 kernel/rcu/tree_plugin.h:674
Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 ed 11 9e 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc900000077a0 EFLAGS: 00000206
RAX: 821f4e927d6e6100 RBX: 1ffff92000000ef8 RCX: 821f4e927d6e6100
RDX: dffffc0000000000 RSI: ffffffff8a0b1be0 RDI: ffffffff8a59e800
RBP: ffffc90000007880 R08: dffffc0000000000 R09: fffffbfff1ff5439
R10: fffffbfff1ff5439 R11: 1ffffffff1ff5438 R12: ffffffff8c120c00
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
 rcu_read_unlock include/linux/rcupdate.h:772 [inline]
 ndisc_send_skb+0xdc4/0x14a0 net/ipv6/ndisc.c:521
 addrconf_rs_timer+0x2b8/0x600 net/ipv6/addrconf.c:3956
 call_timer_fn+0x16c/0x530 kernel/time/timer.c:1451
 expire_timers kernel/time/timer.c:1496 [inline]
 __run_timers+0x525/0x7c0 kernel/time/timer.c:1767
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780
 handle_softirqs+0x328/0x820 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x12f/0x220 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:__schedule+0x11cf/0x4390 kernel/sched/core.c:6403
Code: 4c 89 f6 4c 89 e2 e8 30 87 a9 f7 4c 89 ff 4c 89 f6 e8 e5 51 56 f7 48 89 c7 e8 fd 31 a8 f7 48 c7 84 24 20 01 00 00 0e 36 e0 45 <48> 8b 84 24 18 01 00 00 4a c7 04 28 00 00 00 00 66 42 c7 44 28 0a
RSP: 0018:ffffc900030bf7a0 EFLAGS: 00000282
RAX: 0000000000000000 RBX: 1ffff110054efbcb RCX: 821f4e927d6e6100
RDX: dffffc0000000000 RSI: ffffffff8a0b1be0 RDI: ffff88802a77ef50
RBP: ffffc900030bf970 R08: dffffc0000000000 R09: ffffed1017207662
R10: ffffed1017207662 R11: 1ffff11017207661 R12: ffffc900030bf900
R13: dffffc0000000000 R14: ffff888029528000 R15: ffff88802a77d940
 preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6799
 irqentry_exit+0x63/0x70 kernel/entry/common.c:432
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:__is_kernel_percpu_address mm/percpu.c:2323 [inline]
RIP: 0010:is_kernel_percpu_address+0xb7/0x160 mm/percpu.c:2353
Code: e8 ee 82 d0 ff 83 fb 07 0f 87 8a 00 00 00 e8 80 7f d0 ff 4e 8d 3c fd 20 08 bc 8b 4c 89 f8 48 c1 e8 03 4d 89 ec 42 80 3c 28 00 <74> 08 4c 89 ff e8 ff e7 14 00 4d 8b 2f 4d 8d bd 00 00 00 00 4c 89
RSP: 0018:ffffc900030bfaf0 EFLAGS: 00000246
RAX: 1ffffffff1778104 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc90011652000 RSI: 0000000000014f1f RDI: 0000000000014f20
RBP: 0000000000000002 R08: dffffc0000000000 R09: ffff8880678826b0
R10: ffffed100cf104d8 R11: 1ffff1100cf104d6 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff88804bfe7358 R15: ffffffff8bbc0820
 static_obj kernel/locking/lockdep.c:810 [inline]
 is_dynamic_key+0x5b/0x1f0 kernel/locking/lockdep.c:1205
 lockdep_init_map_type+0x241/0x850 kernel/locking/lockdep.c:4796
 htab_init_buckets kernel/bpf/hashtab.c:148 [inline]
 htab_map_alloc+0x9ed/0x15a0 kernel/bpf/hashtab.c:551
 find_and_alloc_map kernel/bpf/syscall.c:129 [inline]
 map_create+0x485/0x2350 kernel/bpf/syscall.c:881
 __sys_bpf+0x2a4/0x670 kernel/bpf/syscall.c:4639
 __do_sys_bpf kernel/bpf/syscall.c:4761 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:4759 [inline]
 __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4759
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fb968b8b749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb966df2038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fb968de1fa0 RCX: 00007fb968b8b749
RDX: 0000000000000050 RSI: 0000200000000cc0 RDI: 0000000000000000
RBP: 00007fb968c0ff91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb968de2038 R14: 00007fb968de1fa0 R15: 00007ffc103c2a88
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g60809 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=24830
rcu: rcu_preempt kthread starved for 10502 jiffies! g60809 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
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:I stack:27632 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11bb/0x4390 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_timeout+0x15c/0x280 kernel/time/timer.c:1914
 rcu_gp_fqs_loop+0x29e/0x11b0 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0x98/0x350 kernel/rcu/tree.c:2145
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 16992 Comm: syz.5.3353 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__perf_event_account_interrupt+0x33/0x280 kernel/events/core.c:9423
Code: 53 41 89 f6 48 89 fb 49 bd 00 00 00 00 00 fc ff df e8 91 ff e0 ff 48 c7 c7 80 ac 12 8a e8 e5 2b 0b 08 65 4c 8b 3d c5 83 6c 7e <4c> 8d a3 00 02 00 00 4c 89 e5 48 c1 ed 03 42 80 7c 2d 00 00 74 08
RSP: 0018:ffffc90000007228 EFLAGS: 00000086
RAX: 0000000000000000 RBX: ffff8880231e17e0 RCX: 821f4e927d6e6100
RDX: 0000000000000100 RSI: ffffffff8a12ac80 RDI: ffffffff8a59e800
RBP: ffff8880231e1c50 R08: dffffc0000000000 R09: ffffed100463c38b
R10: ffffed100463c38b R11: 1ffff1100463c38a R12: dffffc0000000000
R13: dffffc0000000000 R14: 0000000000000000 R15: 000000000000a50e
FS:  00007fb966df26c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb966db0d58 CR3: 0000000078803000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __perf_event_overflow+0x99/0x530 kernel/events/core.c:9474
 perf_tp_event+0x32c/0xb50 kernel/events/core.c:10047
 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10021
 perf_trace_preemptirq_template+0x2be/0x380 include/trace/events/preemptirq.h:14
 trace_irq_enable_rcuidle+0x108/0x180 include/trace/events/preemptirq.h:40
 trace_hardirqs_on+0x57/0x80 kernel/trace/trace_preemptirq.c:44
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713
RIP: 0010:rcu_read_unlock_special+0x84/0x480 kernel/rcu/tree_plugin.h:674
Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 ed 11 9e 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc900000077a0 EFLAGS: 00000206
RAX: 821f4e927d6e6100 RBX: 1ffff92000000ef8 RCX: 821f4e927d6e6100
RDX: dffffc0000000000 RSI: ffffffff8a0b1be0 RDI: ffffffff8a59e800
RBP: ffffc90000007880 R08: dffffc0000000000 R09: fffffbfff1ff5439
R10: fffffbfff1ff5439 R11: 1ffffffff1ff5438 R12: ffffffff8c120c00
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
 rcu_read_unlock include/linux/rcupdate.h:772 [inline]
 ndisc_send_skb+0xdc4/0x14a0 net/ipv6/ndisc.c:521
 addrconf_rs_timer+0x2b8/0x600 net/ipv6/addrconf.c:3956
 call_timer_fn+0x16c/0x530 kernel/time/timer.c:1451
 expire_timers kernel/time/timer.c:1496 [inline]
 __run_timers+0x525/0x7c0 kernel/time/timer.c:1767
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780
 handle_softirqs+0x328/0x820 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x12f/0x220 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:__schedule+0x11cf/0x4390 kernel/sched/core.c:6403
Code: 4c 89 f6 4c 89 e2 e8 30 87 a9 f7 4c 89 ff 4c 89 f6 e8 e5 51 56 f7 48 89 c7 e8 fd 31 a8 f7 48 c7 84 24 20 01 00 00 0e 36 e0 45 <48> 8b 84 24 18 01 00 00 4a c7 04 28 00 00 00 00 66 42 c7 44 28 0a
RSP: 0018:ffffc900030bf7a0 EFLAGS: 00000282
RAX: 0000000000000000 RBX: 1ffff110054efbcb RCX: 821f4e927d6e6100
RDX: dffffc0000000000 RSI: ffffffff8a0b1be0 RDI: ffff88802a77ef50
RBP: ffffc900030bf970 R08: dffffc0000000000 R09: ffffed1017207662
R10: ffffed1017207662 R11: 1ffff11017207661 R12: ffffc900030bf900
R13: dffffc0000000000 R14: ffff888029528000 R15: ffff88802a77d940
 preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6799
 irqentry_exit+0x63/0x70 kernel/entry/common.c:432
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:__is_kernel_percpu_address mm/percpu.c:2323 [inline]
RIP: 0010:is_kernel_percpu_address+0xb7/0x160 mm/percpu.c:2353
Code: e8 ee 82 d0 ff 83 fb 07 0f 87 8a 00 00 00 e8 80 7f d0 ff 4e 8d 3c fd 20 08 bc 8b 4c 89 f8 48 c1 e8 03 4d 89 ec 42 80 3c 28 00 <74> 08 4c 89 ff e8 ff e7 14 00 4d 8b 2f 4d 8d bd 00 00 00 00 4c 89
RSP: 0018:ffffc900030bfaf0 EFLAGS: 00000246
RAX: 1ffffffff1778104 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc90011652000 RSI: 0000000000014f1f RDI: 0000000000014f20
RBP: 0000000000000002 R08: dffffc0000000000 R09: ffff8880678826b0
R10: ffffed100cf104d8 R11: 1ffff1100cf104d6 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff88804bfe7358 R15: ffffffff8bbc0820
 static_obj kernel/locking/lockdep.c:810 [inline]
 is_dynamic_key+0x5b/0x1f0 kernel/locking/lockdep.c:1205
 lockdep_init_map_type+0x241/0x850 kernel/locking/lockdep.c:4796
 htab_init_buckets kernel/bpf/hashtab.c:148 [inline]
 htab_map_alloc+0x9ed/0x15a0 kernel/bpf/hashtab.c:551
 find_and_alloc_map kernel/bpf/syscall.c:129 [inline]
 map_create+0x485/0x2350 kernel/bpf/syscall.c:881
 __sys_bpf+0x2a4/0x670 kernel/bpf/syscall.c:4639
 __do_sys_bpf kernel/bpf/syscall.c:4761 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:4759 [inline]
 __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4759
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fb968b8b749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb966df2038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fb968de1fa0 RCX: 00007fb968b8b749
RDX: 0000000000000050 RSI: 0000200000000cc0 RDI: 0000000000000000
RBP: 00007fb968c0ff91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb968de2038 R14: 00007fb968de1fa0 R15: 00007ffc103c2a88
 </TASK>