rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (5577 ticks this GP) idle=bc44/1/0x4000000000000000 softirq=11120/11122 fqs=4
rcu: 	(t=10500 jiffies g=8897 q=930 ncpus=2)
rcu: rcu_preempt kthread starved for 10477 jiffies! g8897 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R  running task     stack:27656 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0x1553/0x45a0 kernel/sched/core.c:6700
 schedule+0xbd/0x170 kernel/sched/core.c:6774
 schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x313/0x1590 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 5955 Comm: syz.3.43 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:lock_release+0x7b3/0x8c0 kernel/locking/lockdep.c:-1
Code: e8 f2 98 76 00 e9 bf fb ff ff 48 8b 0c 24 80 e1 07 80 c1 03 38 c1 0f 8c cc fb ff ff 48 8b 3c 24 e8 d2 98 76 00 e9 be fb ff ff <4d> 89 e6 4c 89 7c 24 08 65 8b 05 5a 03 9b 7e 83 f8 08 0f 83 e0 00
RSP: 0018:ffffc90000006a80 EFLAGS: 00000806
RAX: f2f2f2f8f1f1f1f1 RBX: 0000000000000806 RCX: 0000000000000001
RDX: ffffffff97571a80 RSI: ffffffff8430b744 RDI: ffffffff97571a90
RBP: ffffc90000006b90 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000000d64 R12: ffffffff8430b744
R13: dffffc0000000000 R14: ffffffff97571a78 R15: 1ffff92000000d5c
FS:  00007f53b70d16c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f53b70b0d58 CR3: 0000000079156000 CR4: 00000000003506f0
Call Trace:
 <IRQ>
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:149 [inline]
 _raw_spin_unlock_irqrestore+0x71/0x120 kernel/locking/spinlock.c:194
 debug_object_activate+0x304/0x4f0 lib/debugobjects.c:727
 debug_hrtimer_activate kernel/time/hrtimer.c:450 [inline]
 debug_activate kernel/time/hrtimer.c:505 [inline]
 enqueue_hrtimer+0x30/0x370 kernel/time/hrtimer.c:1108
 __run_hrtimer kernel/time/hrtimer.c:1767 [inline]
 __hrtimer_run_queues+0x63a/0xc40 kernel/time/hrtimer.c:1814
 hrtimer_interrupt+0x3c9/0x9c0 kernel/time/hrtimer.c:1876
 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:call_rcu+0x6da/0x950 kernel/rcu/tree.c:2837
Code: f7 84 24 a0 00 00 00 00 02 00 00 43 c6 44 25 04 f8 75 4f f7 44 24 58 00 02 00 00 74 01 fb 48 c7 84 24 80 00 00 00 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 08 00 00 00 00 65 48 8b 04
RSP: 0018:ffffc90000007060 EFLAGS: 00000206
RAX: 7584b718f60e1900 RBX: ffff888077e4db90 RCX: 7584b718f60e1900
RDX: dffffc0000000000 RSI: ffffffff8acac960 RDI: ffffffff8b1c85a0
RBP: ffffc90000007190 R08: ffffffff911c15ff R09: 1ffffffff22382bf
R10: dffffc0000000000 R11: fffffbfff22382c0 R12: dffffc0000000000
R13: 1ffff92000000e1c R14: 1ffff110171c79fd R15: 00000000000002d6
 refdst_drop include/net/dst.h:270 [inline]
 skb_dst_drop include/net/dst.h:282 [inline]
 skb_release_head_state+0x71/0x240 net/core/skbuff.c:1040
 skb_release_all net/core/skbuff.c:1055 [inline]
 __kfree_skb net/core/skbuff.c:1071 [inline]
 consume_skb+0x7b/0x110 net/core/skbuff.c:1287
 geneve_xmit+0x2837/0x3540 drivers/net/geneve.c:1127
 __netdev_start_xmit include/linux/netdevice.h:4943 [inline]
 netdev_start_xmit include/linux/netdevice.h:4957 [inline]
 xmit_one net/core/dev.c:3632 [inline]
 dev_hard_start_xmit+0x246/0x740 net/core/dev.c:3648
 __dev_queue_xmit+0x19a3/0x3660 net/core/dev.c:4442
 dev_queue_xmit include/linux/netdevice.h:3113 [inline]
 neigh_hh_output include/net/neighbour.h:527 [inline]
 neigh_output include/net/neighbour.h:541 [inline]
 ip6_finish_output2+0xe06/0x1630 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+0xc26/0x14f0 net/ipv6/ndisc.c:513
 addrconf_rs_timer+0x2d5/0x630 net/ipv6/addrconf.c:4024
 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x542/0x800 kernel/time/timer.c:2023
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
 handle_softirqs+0x280/0x820 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:__schedule+0x155b/0x45a0 kernel/sched/core.c:-1
Code: f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 fb 27 52 f7 4d 89 3e 4c 89 ef 4c 89 fe e8 0d 28 73 f6 48 89 c7 e8 25 42 d0 f6 <48> 8b 84 24 90 00 00 00 66 42 c7 44 20 12 f8 f8 48 c7 84 24 00 01
RSP: 0018:ffffc900059574a0 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff8880b8e3cd48 RCX: 7584b718f60e1900
RDX: dffffc0000000000 RSI: ffffffff8acac960 RDI: ffff888029d615f8
RBP: ffffc900059576b0 R08: ffffffff8e8aeeef R09: 1ffffffff1d15ddd
R10: dffffc0000000000 R11: fffffbfff1d15dde R12: dffffc0000000000
R13: ffff888029d60000 R14: ffff8880b8e3c010 R15: ffff888025c9da00
 preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6867
 preempt_schedule+0xc0/0xd0 kernel/sched/core.c:6891
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
 unwind_next_frame+0x200f/0x2970 arch/x86/kernel/unwind_orc.c:672
 arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
 ____kasan_kmalloc mm/kasan/common.c:375 [inline]
 __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:384
 kmalloc include/linux/slab.h:600 [inline]
 ccid_get_builtin_ccids+0x76/0x1c0 net/dccp/ccid.c:51
 dccp_feat_init+0x32d/0xe10 net/dccp/feat.c:1493
 dccp_v6_init_sock+0x1f/0xb0 net/dccp/ipv6.c:1024
 inet6_create+0xe7f/0x11d0 net/ipv6/af_inet6.c:257
 __sock_create+0x4a6/0x940 net/socket.c:1570
 sock_create net/socket.c:1626 [inline]
 __sys_socket_create net/socket.c:1663 [inline]
 __sys_socket+0xd7/0x1a0 net/socket.c:1714
 __do_sys_socket net/socket.c:1728 [inline]
 __se_sys_socket net/socket.c:1726 [inline]
 __x64_sys_socket+0x7a/0x90 net/socket.c:1726
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f53b619c799
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:00007f53b70d1028 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 00007f53b6416090 RCX: 00007f53b619c799
RDX: 0000000000000000 RSI: 0000000000000006 RDI: 000000000000000a
RBP: 00007f53b6232c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f53b6416128 R14: 00007f53b6416090 R15: 00007ffc73a6b848
 </TASK>
CPU: 1 PID: 5945 Comm: syz.1.42 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:nf_hook+0x349/0x390 include/linux/netfilter.h:264
Code: 04 1c 00 00 00 00 49 c7 44 1c 08 00 00 00 00 65 48 8b 04 25 28 00 00 00 48 3b 84 24 c0 00 00 00 75 45 44 89 f0 48 8d 65 d8 5b <41> 5c 41 5d 41 5e 41 5f 5d c3 e8 98 35 4e f8 e9 4d fe ff ff e8 8e
RSP: 0018:ffffc900001f0868 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffff888078de1d00 RCX: 2504989cfef5fa00
RDX: 0000000000000008 RSI: ffffffff8acadae0 RDI: ffffffff8b1c85a0
RBP: ffffc900001f0888 R08: ffffffff8e8aeeef R09: 1ffffffff1d15ddd
R10: dffffc0000000000 R11: fffffbfff1d15dde R12: 1ffff9200003e0f8
R13: ffffffff893799e0 R14: 0000000000000001 R15: 0000000000000001
FS:  00007f551ca2f6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000004 CR3: 000000002ec01000 CR4: 00000000003506e0
Call Trace:
 <IRQ>
 NF_HOOK_COND include/linux/netfilter.h:292 [inline]
 ip6_output+0x272/0x3b0 net/ipv6/ip6_output.c:240
 dst_output include/net/dst.h:467 [inline]
 NF_HOOK include/linux/netfilter.h:304 [inline]
 ndisc_send_skb+0xc26/0x14f0 net/ipv6/ndisc.c:513
 addrconf_rs_timer+0x2d5/0x630 net/ipv6/addrconf.c:4024
 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x542/0x800 kernel/time/timer.c:2023
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
 handle_softirqs+0x280/0x820 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:__schedule+0x0/0x45a0 kernel/sched/core.c:6579
Code: cc cc cc cc cc cc cc cc cc cc f3 0f 1e fa be 01 00 00 00 48 c7 c7 40 42 73 8e e8 ab 2c 52 f7 c3 cc cc cc cc cc cc cc cc cc cc <f3> 0f 1e fa 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48
RSP: 0018:ffffc90005887638 EFLAGS: 00010286
RAX: 2504989cfef5fa00 RBX: 0000000000000000 RCX: 2504989cfef5fa00
RDX: dffffc0000000000 RSI: ffffffff8acac960 RDI: 0000000000000001
RBP: ffffc900058876e0 R08: ffffffff911c1507 R09: 1ffffffff22382a0
R10: dffffc0000000000 R11: fffffbfff22382a1 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000b10ec8
 preempt_schedule_irq+0xbf/0x150 kernel/sched/core.c:7010
 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:PagePoisoned include/linux/page-flags.h:297 [inline]
RIP: 0010:PageReserved include/linux/page-flags.h:512 [inline]
RIP: 0010:__text_poke+0x15a/0xb40 arch/x86/kernel/alternative.c:2017
Code: 25 0c 00 49 89 c7 49 c1 ef 06 49 83 e7 c0 49 01 df 4d 89 fe 49 c1 ee 03 43 80 3c 2e 00 74 08 4c 89 ff e8 19 d4 ae 00 49 8b 1f <48> c7 c7 ff ff ff ff 48 89 de e8 57 a9 56 00 48 83 fb ff 0f 84 84
RSP: 0018:ffffc900058877a0 EFLAGS: 00000246
RAX: 000000000168ab2a RBX: 00fff00000004000 RCX: 0000000000080000
RDX: ffffc9000c369000 RSI: 0000000000004344 RDI: 0000000000004345
RBP: ffffc900058878f0 R08: ffffffff911c1507 R09: 1ffffffff22382a0
R10: dffffc0000000000 R11: fffffbfff22382a1 R12: ffffffff8168ab2a
R13: dffffc0000000000 R14: 1ffffd400000b450 R15: ffffea000005a280
 text_poke arch/x86/kernel/alternative.c:2121 [inline]
 text_poke_bp_batch+0x7b9/0x990 arch/x86/kernel/alternative.c:2510
 text_poke_flush arch/x86/kernel/alternative.c:2623 [inline]
 text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2630
 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
 static_key_enable_cpuslocked+0x123/0x240 kernel/jump_label.c:207
 static_key_enable+0x1a/0x20 kernel/jump_label.c:220
 tracepoint_add_func+0x907/0x990 kernel/tracepoint.c:361
 tracepoint_probe_register_prio kernel/tracepoint.c:511 [inline]
 tracepoint_probe_register+0x5e/0x90 kernel/tracepoint.c:531
 perf_trace_event_reg kernel/trace/trace_event_perf.c:129 [inline]
 perf_trace_event_init+0x4d2/0x9b0 kernel/trace/trace_event_perf.c:202
 perf_trace_init+0x238/0x2d0 kernel/trace/trace_event_perf.c:226
 perf_tp_event_init+0x8d/0x110 kernel/events/core.c:10204
 perf_try_init_event+0x12b/0x3c0 kernel/events/core.c:11818
 perf_init_event kernel/events/core.c:11888 [inline]
 perf_event_alloc+0xfa4/0x21b0 kernel/events/core.c:12169
 __do_sys_perf_event_open kernel/events/core.c:12676 [inline]
 __se_sys_perf_event_open+0x740/0x1c50 kernel/events/core.c:12567
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f551bb9c799
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:00007f551ca2f028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f551be15fa0 RCX: 00007f551bb9c799
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000200000000040
RBP: 00007f551bc32c99 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f551be16038 R14: 00007f551be15fa0 R15: 00007ffe937d1f58
 </TASK>