rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (1 GPs behind) idle=293c/1/0x4000000000000000 softirq=10609/10610 fqs=7
	(t=10502 jiffies g=9189 q=1016 ncpus=2)
rcu: rcu_preempt kthread starved for 10150 jiffies! g9189 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:27840 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x10ec/0x40b0 kernel/sched/core.c:6561
 schedule+0xb9/0x180 kernel/sched/core.c:6637
 schedule_timeout+0x15c/0x280 kernel/time/timer.c:1965
 rcu_gp_fqs_loop+0x2f2/0x1310 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0x95/0x380 kernel/rcu/tree.c:1905
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </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: 4581 Comm: syz.3.49 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:__kasan_check_read+0x6/0x10 mm/kasan/shadow.c:31
Code: 41 5f 5d c3 48 c7 c7 33 73 5a 8c eb 0a 48 c7 c7 cc bc 43 8c 48 89 de e8 38 48 3b 08 31 ed eb d7 00 00 cc cc 89 f6 48 8b 0c 24 <31> d2 e9 a3 ec ff ff 0f 1f 00 89 f6 48 8b 0c 24 ba 01 00 00 00 e9
RSP: 0018:ffffc90000006a98 EFLAGS: 00000002
RAX: 0000000000000008 RBX: ffff88802a0bd940 RCX: ffffffff8163aab4
RDX: 0000000000000008 RSI: 0000000000000008 RDI: ffffffff90ae1248
RBP: 0000000000000009 R08: dffffc0000000000 R09: fffffbfff215c24a
R10: fffffbfff215c24a R11: 1ffffffff215c249 R12: 0000000000000200
R13: dffffc0000000000 R14: ffff88802a0be4c0 R15: 0000000000000048
FS:  00007f07724d36c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f07715f8958 CR3: 000000005c860000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 instrument_atomic_read include/linux/instrumented.h:72 [inline]
 _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
 hlock_class kernel/locking/lockdep.c:228 [inline]
 mark_lock+0x94/0x320 kernel/locking/lockdep.c:4606
 mark_usage kernel/locking/lockdep.c:4549 [inline]
 __lock_acquire+0xd6f/0x7c50 kernel/locking/lockdep.c:5003
 lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662
 seqcount_lockdep_reader_access+0xc6/0x1c0 include/linux/seqlock.h:102
 timekeeping_get_delta kernel/time/timekeeping.c:254 [inline]
 timekeeping_get_ns kernel/time/timekeeping.c:388 [inline]
 ktime_get+0x7b/0x270 kernel/time/timekeeping.c:848
 hrtimer_forward_now include/linux/hrtimer.h:509 [inline]
 perf_swevent_hrtimer+0x435/0x500 kernel/events/core.c:10932
 __run_hrtimer kernel/time/hrtimer.c:1752 [inline]
 __hrtimer_run_queues+0x515/0xd60 kernel/time/hrtimer.c:1816
 hrtimer_interrupt+0x3c5/0x9c0 kernel/time/hrtimer.c:1878
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
 __sysvec_apic_timer_interrupt+0x153/0x5a0 arch/x86/kernel/apic/apic.c:1124
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0x4d/0xc0 arch/x86/kernel/apic/apic.c:1118
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:seqcount_lockdep_reader_access+0x17b/0x1c0 include/linux/seqlock.h:105
Code: 00 4d 85 e4 75 16 e8 04 8f 0f 00 eb 15 e8 fd 8e 0f 00 e8 88 01 a6 08 4d 85 e4 74 ea e8 ee 8e 0f 00 fb 48 c7 04 24 0e 36 e0 45 <4b> c7 04 3e 00 00 00 00 66 43 c7 44 3e 09 00 00 43 c6 44 3e 0b 00
RSP: 0018:ffffc90000007560 EFLAGS: 00000246
RAX: ffffffff81714132 RBX: 0000000000000000 RCX: ffff88802a0bd940
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000007618 R08: dffffc0000000000 R09: fffffbfff215c26a
R10: fffffbfff215c26a R11: 1ffffffff215c269 R12: 0000000000000200
R13: 00000060b362f683 R14: 1ffff92000000eac R15: dffffc0000000000
 timekeeping_get_delta kernel/time/timekeeping.c:254 [inline]
 timekeeping_get_ns kernel/time/timekeeping.c:388 [inline]
 ktime_get+0x7b/0x270 kernel/time/timekeeping.c:848
 ktime_get_ns include/linux/timekeeping.h:154 [inline]
 neigh_forced_gc net/core/neighbour.c:257 [inline]
 neigh_alloc net/core/neighbour.c:486 [inline]
 ___neigh_create+0x190/0x24c0 net/core/neighbour.c:649
 ip6_finish_output2+0x14f0/0x1590 net/ipv6/ip6_output.c:129
 dst_output include/net/dst.h:453 [inline]
 NF_HOOK include/linux/netfilter.h:302 [inline]
 ndisc_send_skb+0xbfb/0x1510 net/ipv6/ndisc.c:513
 addrconf_rs_timer+0x2b8/0x600 net/ipv6/addrconf.c:3979
 call_timer_fn+0x1a0/0x670 kernel/time/timer.c:1504
 expire_timers kernel/time/timer.c:1549 [inline]
 __run_timers+0x525/0x7c0 kernel/time/timer.c:1820
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1833
 handle_softirqs+0x2a1/0x920 kernel/softirq.c:596
 __do_softirq kernel/softirq.c:630 [inline]
 invoke_softirq kernel/softirq.c:470 [inline]
 __irq_exit_rcu+0x12f/0x220 kernel/softirq.c:679
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:finish_task_switch+0x26a/0x8f0 kernel/sched/core.c:5123
Code: 0f 84 3b 01 00 00 48 85 db 0f 85 5a 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 10 e0 c8 08 e8 cb b2 2e 00 fb 4c 8b 65 c0 <49> 8d bc 24 f8 15 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc90003847458 EFLAGS: 00000282
RAX: e66cc4c18c5bca00 RBX: 0000000000000000 RCX: e66cc4c18c5bca00
RDX: dffffc0000000000 RSI: ffffffff8a8c0300 RDI: ffffffff8adefae0
RBP: ffffc900038474b0 R08: dffffc0000000000 R09: fffffbfff215c24f
R10: fffffbfff215c24f R11: 1ffffffff215c24e R12: ffff88802a0bd940
R13: dffffc0000000000 R14: ffff8880305a9dc0 R15: ffff8880b8e3b550
 context_switch kernel/sched/core.c:5247 [inline]
 __schedule+0x10f4/0x40b0 kernel/sched/core.c:6561
 preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6873
 irqentry_exit+0x63/0x70 kernel/entry/common.c:439
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:lock_is_held_type+0x13a/0x190 kernel/locking/lockdep.c:5710
Code: 75 40 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 46 41 f7 c5 00 02 00 00 74 01 fb 65 48 8b 04 25 28 00 00 00 <48> 3b 44 24 08 75 3c 89 e8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc900038477c8 EFLAGS: 00000206
RAX: e66cc4c18c5bca00 RBX: ffff88802a0bd940 RCX: e66cc4c18c5bca00
RDX: 0000000000000000 RSI: ffffffff8a8c1480 RDI: ffffffff8adefae0
RBP: 0000000000000001 R08: ffff88802a0bd940 R09: 0000000000000003
R10: 0000000000000011 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000246 R14: ffff888030002e58 R15: ffff88802a0be420
 lock_is_held include/linux/lockdep.h:283 [inline]
 mt_locked lib/maple_tree.c:-1 [inline]
 mas_root lib/maple_tree.c:858 [inline]
 mas_start+0x19d/0x460 lib/maple_tree.c:1399
 mas_state_walk lib/maple_tree.c:3894 [inline]
 mas_walk+0x2f/0x180 lib/maple_tree.c:5137
 mas_find+0x1db/0x230 lib/maple_tree.c:6107
 vma_find include/linux/mm.h:690 [inline]
 vma_next include/linux/mm.h:699 [inline]
 acct_collect+0x172/0x730 kernel/acct.c:599
 do_exit+0x845/0x2400 kernel/exit.c:850
 do_group_exit+0x217/0x2d0 kernel/exit.c:1022
 get_signal+0x1272/0x1350 kernel/signal.c:2871
 arch_do_signal_or_restart+0xb0/0x1230 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
 irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:316
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0033:0x7ffda94b3954
Code: b8 01 00 00 00 89 f9 d3 e0 a9 83 08 00 00 0f 84 ef 00 00 00 4c 8d 35 3b b7 ff ff 41 89 fc 49 c1 e4 04 4b 8d 5c 26 20 45 8b 3e <41> f6 c7 01 75 3b 41 8b 46 04 83 f8 01 75 44 0f 01 f9 66 90 48 c1
RSP: 002b:00007f07724d3000 EFLAGS: 00000202
RAX: 0000000000000002 RBX: 00007ffda94af0b0 RCX: 0000000000000001
RDX: 00007f077169a540 RSI: 00007f07724d30b0 RDI: 0000000000000001
RBP: 00007f07724d3040 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000010
R13: 00007f07717b6038 R14: 00007ffda94af080 R15: 00000000000039c4
 </TASK>
CPU: 1 PID: 4583 Comm: syz.2.50 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:seqcount_lockdep_reader_access+0x17b/0x1c0 include/linux/seqlock.h:105
Code: 00 4d 85 e4 75 16 e8 04 8f 0f 00 eb 15 e8 fd 8e 0f 00 e8 88 01 a6 08 4d 85 e4 74 ea e8 ee 8e 0f 00 fb 48 c7 04 24 0e 36 e0 45 <4b> c7 04 3e 00 00 00 00 66 43 c7 44 3e 09 00 00 43 c6 44 3e 0b 00
RSP: 0018:ffffc900001e01e0 EFLAGS: 00000246
RAX: ffffffff81714132 RBX: 0000000000000000 RCX: ffff88802a0bbb80
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900001e0298 R08: dffffc0000000000 R09: fffffbfff215c26a
R10: fffffbfff215c26a R11: 1ffffffff215c269 R12: 0000000000000200
R13: 000001fb63109b96 R14: 1ffff9200003c03c R15: dffffc0000000000
FS:  00007f88a11e06c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000000 CR3: 00000000300b4000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 timekeeping_get_delta kernel/time/timekeeping.c:254 [inline]
 timekeeping_get_ns kernel/time/timekeeping.c:388 [inline]
 ktime_get_with_offset+0xff/0x320 kernel/time/timekeeping.c:891
 ktime_get_real include/linux/timekeeping.h:79 [inline]
 netif_rx_internal+0x398/0x560 net/core/dev.c:5023
 __netif_rx+0x74/0xb0 net/core/dev.c:5066
 veth_forward_skb drivers/net/veth.c:290 [inline]
 veth_xmit+0x650/0xb00 drivers/net/veth.c:343
 __netdev_start_xmit include/linux/netdevice.h:4896 [inline]
 netdev_start_xmit include/linux/netdevice.h:4910 [inline]
 xmit_one net/core/dev.c:3670 [inline]
 dev_hard_start_xmit+0x262/0x870 net/core/dev.c:3686
 __dev_queue_xmit+0x1bf1/0x3760 net/core/dev.c:4346
 dev_queue_xmit include/linux/netdevice.h:3051 [inline]
 neigh_hh_output include/net/neighbour.h:529 [inline]
 neigh_output include/net/neighbour.h:543 [inline]
 ip6_finish_output2+0xd6b/0x1590 net/ipv6/ip6_output.c:138
 dst_output include/net/dst.h:453 [inline]
 NF_HOOK include/linux/netfilter.h:302 [inline]
 ndisc_send_skb+0xbfb/0x1510 net/ipv6/ndisc.c:513
 addrconf_rs_timer+0x2b8/0x600 net/ipv6/addrconf.c:3979
 call_timer_fn+0x1a0/0x670 kernel/time/timer.c:1504
 expire_timers kernel/time/timer.c:1549 [inline]
 __run_timers+0x525/0x7c0 kernel/time/timer.c:1820
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1833
 handle_softirqs+0x2a1/0x920 kernel/softirq.c:596
 __do_softirq kernel/softirq.c:630 [inline]
 invoke_softirq kernel/softirq.c:470 [inline]
 __irq_exit_rcu+0x12f/0x220 kernel/softirq.c:679
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:lock_acquire+0x20f/0x490 kernel/locking/lockdep.c:5666
Code: 00 9c 8f 84 24 80 00 00 00 f6 84 24 81 00 00 00 02 0f 85 f5 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 44 3d 00 00 00 00 00 66 43 c7 44 3d 09 00 00 43 c6 44 3d 0b
RSP: 0018:ffffc900037b7900 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 2c9a596a6974a000
RDX: 0000000000000000 RSI: ffffffff8a8c1480 RDI: ffffffff8adefae0
RBP: ffffc900037b7a20 R08: dffffc0000000000 R09: fffffbfff215c262
R10: fffffbfff215c262 R11: 1ffffffff215c261 R12: 0000000000000001
R13: 1ffff920006f6f2c R14: 0000000000000246 R15: dffffc0000000000
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:351 [inline]
 futex_q_lock+0x1a6/0x240 kernel/futex/core.c:542
 futex_wait_setup+0xd9/0x260 kernel/futex/waitwake.c:607
 futex_wait+0x16e/0x530 kernel/futex/waitwake.c:651
 do_futex+0x310/0x320 kernel/futex/syscalls.c:106
 __do_sys_futex kernel/futex/syscalls.c:183 [inline]
 __se_sys_futex+0x14a/0x440 kernel/futex/syscalls.c:164
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f88a038ebe9
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:00007f88a11e00e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f88a05b5fa8 RCX: 00007f88a038ebe9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f88a05b5fa8
RBP: 00007f88a05b5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f88a05b6038 R14: 00007fff1556cd80 R15: 00007fff1556ce68
 </TASK>