rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=2484/1/0x4000000000000002 softirq=10297/10316 fqs=4
	(detected by 0, t=10502 jiffies, g=9197, q=194 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4550 Comm: syz.2.35 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:unwind_next_frame+0x97c/0x20b0 arch/x86/kernel/unwind_orc.c:-1
Code: 84 c0 0f 85 72 11 00 00 4d 89 f7 49 c1 ef 03 43 0f b6 04 2f 84 c0 0f 85 7d 11 00 00 0f b6 45 01 83 e0 03 ff 24 c5 90 74 89 8a <4c> 89 74 24 70 4c 89 64 24 20 4c 8d 73 08 4d 89 f4 49 c1 ec 03 43
RSP: 0018:ffffc900001dff48 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffffc900001e0080 RCX: ffffffff8e32c9cc
RDX: ffffc900001e08d8 RSI: ffffffff8e32c9bc RDI: 0000000000000001
RBP: ffffffff8ea45ff8 R08: 000000000000000d R09: ffffc900001e00d0
R10: fffff5200003c01c R11: 1ffff9200003c01a R12: ffffffff8ea45ff4
R13: dffffc0000000000 R14: ffffffff8ea45ff9 R15: 1ffffffff1d48bff
FS:  00007fe4edd5e6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f063fff CR3: 00000000575e5000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 perf_callchain_kernel+0x461/0x5c0 arch/x86/events/core.c:2805
 get_perf_callchain+0x376/0x480 kernel/events/callchain.c:200
 perf_callchain kernel/events/core.c:7512 [inline]
 perf_prepare_sample+0x399/0x2040 kernel/events/core.c:7545
 __perf_event_output kernel/events/core.c:7730 [inline]
 perf_event_output_forward+0x163/0x2a0 kernel/events/core.c:7750
 __perf_event_overflow+0x448/0x610 kernel/events/core.c:9496
 perf_tp_event+0x335/0xb60 kernel/events/core.c:10029
 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10002
 perf_trace_preemptirq_template+0x287/0x330 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+0x84/0x500 kernel/rcu/tree_plugin.h:685
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 2d 97 96 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc900001e0980 EFLAGS: 00000206
RAX: e959d06e0c5f3300 RBX: 1ffff9200003c138 RCX: e959d06e0c5f3300
RDX: dffffc0000000000 RSI: ffffffff8a8c0500 RDI: ffffffff8adefca0
RBP: ffffc900001e0a80 R08: dffffc0000000000 R09: fffffbfff215c468
R10: fffffbfff215c468 R11: 1ffffffff215c467 R12: 0000000000000246
R13: dffffc0000000000 R14: ffff8880b8f3b900 R15: 0000000000000002
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
 rcu_read_unlock include/linux/rcupdate.h:823 [inline]
 hsr_announce+0x2c4/0x340 net/hsr/hsr_device.c:384
 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 70 e0 c8 08 e8 2b b3 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:ffffc90003747838 EFLAGS: 00000282
RAX: e959d06e0c5f3300 RBX: 0000000000000000 RCX: e959d06e0c5f3300
RDX: dffffc0000000000 RSI: ffffffff8a8c0500 RDI: ffffffff8adefca0
RBP: ffffc90003747890 R08: dffffc0000000000 R09: fffffbfff215c46c
R10: fffffbfff215c46c R11: 1ffffffff215c46b R12: ffff88802fedbb80
R13: dffffc0000000000 R14: ffff88802e27bb80 R15: ffff8880b8f3b590
 context_switch kernel/sched/core.c:5247 [inline]
 __schedule+0x10f4/0x40b0 kernel/sched/core.c:6561
 preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:6730
 preempt_schedule+0xa7/0xb0 kernel/sched/core.c:6754
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
 smp_call_function_single+0x456/0x560 kernel/smp.c:789
 task_function_call kernel/events/core.c:120 [inline]
 perf_install_in_context+0x59a/0x8f0 kernel/events/core.c:2941
 __do_sys_perf_event_open kernel/events/core.c:12784 [inline]
 __se_sys_perf_event_open+0x1247/0x1e60 kernel/events/core.c:12378
 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: 0033:0x7fe4ecf8eba9
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:00007fe4edd5e038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007fe4ed1d5fa0 RCX: 00007fe4ecf8eba9
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000140
RBP: 00007fe4ed011e19 R08: 000000000000000b R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe4ed1d6038 R14: 00007fe4ed1d5fa0 R15: 00007ffd37e446c8
 </TASK>
rcu: rcu_preempt kthread starved for 10494 jiffies! g9197 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:28096 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:
CPU: 0 PID: 4552 Comm: syz.0.36 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
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 98 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:ffffc900000068e0 EFLAGS: 00000246
RAX: ffffffff817141a2 RBX: 0000000000000000 RCX: ffff88801abf9dc0
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000006998 R08: dffffc0000000000 R09: fffffbfff215c461
R10: fffffbfff215c461 R11: 1ffffffff215c460 R12: 0000000000000200
R13: 1ffff92000000d58 R14: 1ffff92000000d1c R15: dffffc0000000000
FS:  00007f21469306c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000000 CR3: 0000000026391000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 ktime_get_with_offset+0x90/0x320 kernel/time/timekeeping.c:889
 ktime_get_real include/linux/timekeeping.h:79 [inline]
 mac80211_hwsim_get_tsf_raw drivers/net/wireless/mac80211_hwsim.c:1070 [inline]
 mac80211_hwsim_tx_frame_no_nl+0x741/0x1330 drivers/net/wireless/mac80211_hwsim.c:1676
 mac80211_hwsim_tx+0x18c5/0x2630 drivers/net/wireless/mac80211_hwsim.c:1940
 drv_tx net/mac80211/driver-ops.h:35 [inline]
 ieee80211_tx_frags+0x3ee/0x8d0 net/mac80211/tx.c:1773
 __ieee80211_tx+0x21b/0x4e0 net/mac80211/tx.c:1827
 ieee80211_tx+0x2e4/0x410 net/mac80211/tx.c:2007
 __ieee80211_subif_start_xmit+0x1021/0x3210 net/mac80211/tx.c:4275
 ieee80211_subif_start_xmit+0xde/0x460 net/mac80211/tx.c:4467
 __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
 sch_direct_xmit+0x24e/0x4a0 net/sched/sch_generic.c:342
 __dev_xmit_skb net/core/dev.c:3907 [inline]
 __dev_queue_xmit+0x18cd/0x3760 net/core/dev.c:4312
 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: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 70 e0 c8 08 e8 2b b3 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:ffffc90003697b98 EFLAGS: 00000282
RAX: 631073e4e278de00 RBX: 0000000000000000 RCX: 631073e4e278de00
RDX: dffffc0000000000 RSI: ffffffff8a8c0500 RDI: ffffffff8adefca0
RBP: ffffc90003697bf0 R08: dffffc0000000000 R09: ffffed10171c6afa
R10: ffffed10171c6afa R11: 1ffff110171c6af9 R12: ffff88801abf9dc0
R13: dffffc0000000000 R14: ffff88802e27bb80 R15: ffff8880b8e3b590
 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:__syscall_enter_from_user_work kernel/entry/common.c:97 [inline]
RIP: 0010:syscall_enter_from_user_mode+0x2a/0x80 kernel/entry/common.c:118
Code: 41 56 53 48 89 f3 49 89 fe 48 8b 7c 24 10 e8 ed fa ff ff 66 90 66 90 e8 84 e4 6f f7 e8 ff e2 6f f7 fb 65 48 8b 05 86 25 eb 75 <48> 8b 70 08 40 f6 c6 3f 74 0b 4c 89 f7 5b 41 5e e9 b1 8b 56 f7 48
RSP: 0018:ffffc90003697f08 EFLAGS: 00000286
RAX: ffff88801abf9dc0 RBX: 00000000000000ca RCX: 631073e4e278de00
RDX: dffffc0000000000 RSI: ffffffff8a8c0500 RDI: ffffffff8adefca0
RBP: ffffc90003697f48 R08: dffffc0000000000 R09: ffffed10171c6afa
R10: ffffed10171c6afa R11: 1ffff110171c6af9 R12: 0000000000000000
R13: 0000000000000000 R14: ffffc90003697f58 R15: 0000000000000000
 do_syscall_64+0x24/0xa0 arch/x86/entry/common.c:77
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f2145b8eba9
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:00007f21469300e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f2145dd5fa8 RCX: 00007f2145b8eba9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f2145dd5fac
RBP: 00007f2145dd5fa0 R08: 0013fa4ad79a43ac R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2145dd6038 R14: 00007ffc3a65d410 R15: 00007ffc3a65d4f8
 </TASK>