rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=046c/1/0x4000000000000002 softirq=92729/92730 fqs=10
	(detected by 1, t=10502 jiffies, g=134549, q=216 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 27766 Comm: syz.6.5339 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:__orc_find arch/x86/kernel/unwind_orc.c:59 [inline]
RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:-1 [inline]
RIP: 0010:unwind_next_frame+0x2a0/0x1fd0 arch/x86/kernel/unwind_orc.c:448
Code: fc ff ff ff 4c 8d ac 08 88 e3 2e 8f 49 81 fd 88 e3 2e 8f 0f 83 53 12 00 00 48 c7 c0 88 e3 2e 8f 49 29 c4 48 c7 c2 a8 6e 9d 8f <49> c1 fc 02 4f 8d 24 64 4d 01 e4 49 01 d4 48 bd 00 00 00 00 00 fc
RSP: 0018:ffffc90000007018 EFLAGS: 00000012
RAX: ffffffff8f349f54 RBX: ffffc90000007120 RCX: ffffffff8f349f5c
RDX: ffffffff8fa60806 RSI: ffffffff8f349f1c RDI: 0000000000000001
RBP: ffffffff8f349f58 R08: 0000000000000011 R09: ffffc90000007170
R10: dffffc0000000000 R11: fffff52000000e30 R12: 0000000000000038
R13: ffffffff8f349f54 R14: ffffffff816d05a7 R15: ffffffff8f349f58
FS:  00007f5a417f26c0(0000) GS:ffff8880b8c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000000 CR3: 0000000077888000 CR4: 00000000003506f0
DR0: 0000200000001040 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 perf_callchain_kernel+0x42a/0x690 arch/x86/events/core.c:2805
 get_perf_callchain+0x236/0x490 kernel/events/callchain.c:204
 perf_callchain kernel/events/core.c:7522 [inline]
 perf_prepare_sample+0x399/0x2020 kernel/events/core.c:7555
 __perf_event_output kernel/events/core.c:7740 [inline]
 perf_event_output_forward+0x197/0x2f0 kernel/events/core.c:7760
 __perf_event_overflow+0x457/0x630 kernel/events/core.c:9506
 perf_swevent_overflow kernel/events/core.c:9589 [inline]
 perf_swevent_event+0x315/0x570 kernel/events/core.c:9640
 perf_tp_event+0x36b/0xc10 kernel/events/core.c:10074
 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10042
 perf_trace_preemptirq_template+0x268/0x320 include/trace/events/preemptirq.h:14
 trace_irq_enable_rcuidle+0xd3/0x140 include/trace/events/preemptirq.h:40
 trace_hardirqs_on+0x24/0x40 kernel/trace/trace_preemptirq.c:44
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:rcu_read_unlock_special+0x7f/0x510 kernel/rcu/tree_plugin.h:685
Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 d2 68 95 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc90000007ae0 EFLAGS: 00000206
RAX: 84c45494311d3500 RBX: 1ffff92000000f64 RCX: 84c45494311d3500
RDX: dffffc0000000000 RSI: ffffffff8aac19a0 RDI: ffffffff8aff71e0
RBP: ffffc90000007bd0 R08: ffff8880b8c357cb R09: 1ffff11017186af9
R10: dffffc0000000000 R11: ffffed1017186afa R12: 0000000000000246
R13: dffffc0000000000 R14: ffff8880b8c3bb00 R15: 0000000000000001
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
 rcu_read_unlock include/linux/rcupdate.h:823 [inline]
 ieee80211_iterate_active_interfaces_atomic+0x156/0x170 net/mac80211/util.c:826
 mac80211_hwsim_beacon+0xb7/0x1b0 drivers/net/wireless/mac80211_hwsim.c:2153
 __run_hrtimer kernel/time/hrtimer.c:1751 [inline]
 __hrtimer_run_queues+0x522/0xc90 kernel/time/hrtimer.c:1815
 hrtimer_run_softirq+0x173/0x290 kernel/time/hrtimer.c:1832
 handle_softirqs+0x291/0x910 kernel/softirq.c:596
 __do_softirq kernel/softirq.c:630 [inline]
 invoke_softirq kernel/softirq.c:470 [inline]
 __irq_exit_rcu+0x13b/0x230 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:cmpxchg_double_slab+0x128/0x350 mm/slub.c:552
Code: 02 00 00 0f 84 8e 00 00 00 fb e9 88 00 00 00 41 8d 46 20 a8 0f 0f 85 1e 01 00 00 4c 89 c9 4c 89 fa 4c 89 e0 f0 49 0f c7 4e 20 <b0> 01 75 65 eb 67 49 8b 46 08 a8 01 0f 85 e0 01 00 00 0f 1f 44 00
RSP: 0018:ffffc90003337ba0 EFLAGS: 00000246
RAX: ffff88803be0c000 RBX: ffff88803be0e000 RCX: 0000000080040000
RDX: 0000000080040001 RSI: ffffea0000ef8200 RDI: ffff888018442140
RBP: 0000000000000000 R08: ffff88803be0e000 R09: 0000000080040000
R10: dffffc0000000000 R11: ffffed1017186afa R12: ffff88803be0c000
R13: 0000000080040000 R14: ffffea0000ef8200 R15: 0000000080040001
 __slab_free+0xa1/0x290 mm/slub.c:3546
 qlink_free mm/kasan/quarantine.c:168 [inline]
 qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x144/0x160 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x1e/0x80 mm/kasan/common.c:306
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook+0x4b/0x490 mm/slab.h:737
 slab_alloc_node mm/slub.c:3359 [inline]
 slab_alloc mm/slub.c:3367 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3374 [inline]
 kmem_cache_alloc+0x18b/0x2f0 mm/slub.c:3383
 getname_flags+0xb7/0x500 fs/namei.c:139
 do_sys_openat2+0xdd/0x4f0 fs/open.c:1314
 do_sys_open fs/open.c:1336 [inline]
 __do_sys_openat fs/open.c:1352 [inline]
 __se_sys_openat fs/open.c:1347 [inline]
 __x64_sys_openat+0x135/0x160 fs/open.c:1347
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f5a4099f559
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:00007f5a417f2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f5a40c25fa0 RCX: 00007f5a4099f559
RDX: 00000000000026e1 RSI: 0000200000000180 RDI: ffffffffffffff9c
RBP: 00007f5a40a36b20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5a40c26038 R14: 00007f5a40c25fa0 R15: 00007ffc3dd09298
 </TASK>
rcu: rcu_preempt kthread starved for 10482 jiffies! g134549 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:27024 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5246 [inline]
 __schedule+0x107f/0x4030 kernel/sched/core.c:6563
 schedule+0xb9/0x180 kernel/sched/core.c:6639
 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x303/0x1350 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0x99/0x3b0 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:
CPU: 1 PID: 27767 Comm: syz.6.5339 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:hash_conntrack_raw net/netfilter/nf_conntrack_core.c:231 [inline]
RIP: 0010:hash_conntrack+0x109/0x2a0 net/netfilter/nf_conntrack_core.c:255
Code: 3d 0a 55 f9 8b 44 24 1c 89 44 24 64 49 81 c7 78 02 00 00 4c 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 c6 00 00 00 41 8b 07 <89> 44 24 68 49 8d 7e 24 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc900001dfc60 EFLAGS: 00000246
RAX: 0000000090d889bb RBX: 1ffff9200003bf90 RCX: 0000000000000000
RDX: 0000000000000010 RSI: ffff88807c8dc9bc RDI: ffffc900001dfcc4
RBP: ffffc900001dfd68 R08: ffffc900001dfcc3 R09: 1ffff9200003bf98
R10: dffffc0000000000 R11: fffff5200003bf99 R12: ffffc900001dfca0
R13: dffffc0000000000 R14: ffff88807c8dc998 R15: ffff88807bf45738
FS:  00007f5a417d16c0(0000) GS:ffff8880b8d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0740ff4158 CR3: 0000000077888000 CR4: 00000000003506e0
DR0: 0000200000000940 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __nf_conntrack_confirm+0x1dc/0x10c0 net/netfilter/nf_conntrack_core.c:1214
 nf_conntrack_confirm include/net/netfilter/nf_conntrack_core.h:62 [inline]
 nf_confirm+0x392/0x570 net/netfilter/nf_conntrack_proto.c:160
 ipv6_confirm+0x4ec/0x620 net/netfilter/nf_conntrack_proto.c:406
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_slow+0xb9/0x200 net/netfilter/core.c:614
 nf_hook+0x224/0x390 include/linux/netfilter.h:257
 NF_HOOK_COND include/linux/netfilter.h:290 [inline]
 ip6_output+0x273/0x3b0 net/ipv6/ip6_output.c:239
 ip6tunnel_xmit include/net/ip6_tunnel.h:161 [inline]
 udp_tunnel6_xmit_skb+0x512/0x920 net/ipv6/ip6_udp_tunnel.c:110
 geneve6_xmit_skb drivers/net/geneve.c:1093 [inline]
 geneve_xmit+0x23e6/0x3490 drivers/net/geneve.c:1122
 __netdev_start_xmit include/linux/netdevice.h:4894 [inline]
 netdev_start_xmit include/linux/netdevice.h:4908 [inline]
 xmit_one net/core/dev.c:3696 [inline]
 dev_hard_start_xmit+0x292/0x8b0 net/core/dev.c:3712
 __dev_queue_xmit+0x1b4b/0x3810 net/core/dev.c:4376
 neigh_output include/net/neighbour.h:549 [inline]
 ip6_finish_output2+0xf28/0x1680 net/ipv6/ip6_output.c:140
 dst_output include/net/dst.h:456 [inline]
 NF_HOOK include/linux/netfilter.h:302 [inline]
 ndisc_send_skb+0xc04/0x1520 net/ipv6/ndisc.c:513
 addrconf_rs_timer+0x367/0x640 net/ipv6/addrconf.c:3994
 call_timer_fn+0x1ac/0x670 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x56c/0x810 kernel/time/timer.c:2023
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:2036
 handle_softirqs+0x291/0x910 kernel/softirq.c:596
 __do_softirq kernel/softirq.c:630 [inline]
 invoke_softirq kernel/softirq.c:470 [inline]
 __irq_exit_rcu+0x13b/0x230 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:preempt_schedule_irq+0xb6/0x160 kernel/sched/core.c:6875
Code: 00 00 43 c6 44 37 04 f8 74 0b 0f 0b 48 f7 03 08 00 00 00 74 7f bf 01 00 00 00 e8 d5 29 15 f7 e8 50 1b 45 f7 fb bf 01 00 00 00 <e8> 25 ba ff ff 43 c6 44 37 08 00 48 c7 44 24 40 00 00 00 00 9c 8f
RSP: 0018:ffffc900033c7640 EFLAGS: 00000286
RAX: 9f50be73050a3e00 RBX: 0000000000000000 RCX: 9f50be73050a3e00
RDX: dffffc0000000000 RSI: ffffffff8aac19a0 RDI: 0000000000000001
RBP: ffffc900033c76e0 R08: ffff8880b8d357cb R09: 1ffff110171a6af9
R10: dffffc0000000000 R11: ffffed10171a6afa R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000678ec8
 irqentry_exit+0x63/0x70 kernel/entry/common.c:442
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:obj_cgroup_charge+0x32a/0x620 mm/memcontrol.c:3358
Code: 84 24 80 00 00 00 f7 84 24 80 00 00 00 00 02 00 00 41 c6 44 1f 08 f8 0f 85 21 01 00 00 41 f7 c4 00 02 00 00 74 01 fb 45 31 e4 <80> 7c 24 14 00 0f 85 a0 00 00 00 48 8b 44 24 18 49 89 c6 49 c1 ee
RSP: 0018:ffffc900033c77a0 EFLAGS: 00000246
RAX: 9f50be73050a3e00 RBX: dffffc0000000000 RCX: 9f50be73050a3e00
RDX: dffffc0000000000 RSI: ffffffff8aac19a0 RDI: ffffffff8aff71e0
RBP: ffffc900033c7888 R08: ffff8880b8d357cb R09: 1ffff110171a6af9
R10: dffffc0000000000 R11: ffffed10171a6afa R12: 0000000000000000
R13: ffff8880b8d36910 R14: ffff8880b8d36938 R15: 1ffff92000678efc
 memcg_slab_pre_alloc_hook mm/slab.h:501 [inline]
 slab_pre_alloc_hook+0x2e2/0x300 mm/slab.h:715
 slab_alloc_node mm/slub.c:3279 [inline]
 slab_alloc mm/slub.c:3367 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3374 [inline]
 kmem_cache_alloc+0x56/0x2f0 mm/slub.c:3383
 kmem_cache_zalloc include/linux/slab.h:689 [inline]
 __alloc_file+0x25/0x230 fs/file_table.c:138
 alloc_empty_file+0x90/0x180 fs/file_table.c:187
 path_openat+0x11c/0x2f10 fs/namei.c:3820
 do_filp_open+0x1ee/0x420 fs/namei.c:3861
 do_sys_openat2+0x14b/0x4f0 fs/open.c:1320
 do_sys_open fs/open.c:1336 [inline]
 __do_sys_openat fs/open.c:1352 [inline]
 __se_sys_openat fs/open.c:1347 [inline]
 __x64_sys_openat+0x135/0x160 fs/open.c:1347
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f5a4099f559
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:00007f5a417d1028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f5a40c26090 RCX: 00007f5a4099f559
RDX: 00000000000026e1 RSI: 0000200000000180 RDI: ffffffffffffff9c
RBP: 00007f5a40a36b20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5a40c26128 R14: 00007f5a40c26090 R15: 00007ffc3dd09298
 </TASK>