rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=cbcc/1/0x4000000000000000 softirq=41486/41487 fqs=2
	(detected by 0, t=10503 jiffies, g=58917, q=50 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 11755 Comm: syz.4.2137 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:instrument_atomic_read include/linux/instrumented.h:-1 [inline]
RIP: 0010:_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
RIP: 0010:__lock_acquire+0xe4d/0x7c40 kernel/locking/lockdep.c:5033
Code: 83 3d 16 6a 5d 15 00 48 8b 44 24 70 75 34 48 63 d8 48 89 d8 48 c1 e8 06 48 8d 3c c5 40 02 b1 90 be 08 00 00 00 e8 d3 41 6f 00 <49> b8 00 00 00 00 00 fc ff df 48 0f a3 1d e1 fa 4c 0f 0f 83 f8 4b
RSP: 0018:ffffc900001e0420 EFLAGS: 00000056
RAX: 0000000000000001 RBX: 000000000000002d RCX: ffffffff8164074d
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff90b10240
RBP: ffffc900001e0650 R08: ffffffff90b10247 R09: 1ffffffff2162048
R10: dffffc0000000000 R11: fffffbfff2162049 R12: ffff88802e57e4d8
R13: ffff88802e57da00 R14: ffff88802e57e530 R15: ffff88802e57e550
FS:  00007f66cf7b66c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c31060e CR3: 000000007ad4e000 CR4: 00000000003506e0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5676
 rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
 rcu_read_lock include/linux/rcupdate.h:791 [inline]
 trace_call_bpf+0xe0/0x6b0 kernel/trace/bpf_trace.c:134
 perf_trace_run_bpf_submit+0x79/0x1c0 kernel/events/core.c:10027
 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 52 82 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:ffffc900001e0ac0 EFLAGS: 00000206
RAX: 5fc277cf9821cf00 RBX: 1ffff9200003c160 RCX: 5fc277cf9821cf00
RDX: dffffc0000000000 RSI: ffffffff8a8c17a0 RDI: ffffffff8adf42e0
RBP: ffffc900001e0bc0 R08: ffffffff90b10317 R09: 1ffffffff2162062
R10: dffffc0000000000 R11: fffffbfff2162063 R12: 0000000000000246
R13: dffffc0000000000 R14: ffff8880b8f3bb00 R15: 0000000000000002
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
 rcu_read_unlock include/linux/rcupdate.h:823 [inline]
 ieee80211_rx_napi+0x23d/0x3c0 net/mac80211/rx.c:5339
 ieee80211_rx include/net/mac80211.h:4849 [inline]
 ieee80211_handle_queued_frames+0x104/0x1a0 net/mac80211/main.c:317
 tasklet_action_common+0x2d0/0x460 kernel/softirq.c:827
 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:plist_del+0x0/0x3b0 lib/plist.c:113
Code: f9 80 e1 07 80 c1 03 38 c1 0f 8c ef fc ff ff 4c 89 ff e8 63 3a b3 f7 e9 e2 fc ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 <55> 41 57 41 56 41 55 41 54 53 48 83 ec 10 48 89 f3 49 89 fe 48 bd
RSP: 0018:ffffc9000c7a7ba8 EFLAGS: 00000246
RAX: ffffffff81763fad RBX: ffffc9000c617c50 RCX: 0000000000080000
RDX: ffffc9000e22a000 RSI: ffffc90000a2fa48 RDI: ffffc9000c617c50
RBP: 0000000000000001 R08: ffff8880303ebc2b R09: 1ffff1100607d785
R10: dffffc0000000000 R11: ffffed100607d786 R12: ffffc9000c617c80
R13: dffffc0000000000 R14: ffffc90000a2fa00 R15: ffffc90000a2fa08
 __futex_unqueue+0xe7/0x150 kernel/futex/core.c:518
 futex_wake_mark+0xe8/0x150 kernel/futex/waitwake.c:123
 futex_wake+0x32b/0x4f0 kernel/futex/waitwake.c:177
 do_futex+0x2e2/0x320 kernel/futex/syscalls.c:139
 __do_sys_futex kernel/futex/syscalls.c:211 [inline]
 __se_sys_futex+0x381/0x410 kernel/futex/syscalls.c:192
 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: 0033:0x7f66ce99de99
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:00007f66cf7b60e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f66cec25fa8 RCX: 00007f66ce99de99
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f66cec25fac
RBP: 00007f66cec25fa0 R08: 00021700723ff6fc R09: 0000000000000000
R10: 0000000000000007 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f66cec26038 R14: 00007ffe44f9b6f0 R15: 00007ffe44f9b7d8
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10494 jiffies! g58917 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=29381
rcu: rcu_preempt kthread starved for 10495 jiffies! g58917 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:26800 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0x107f/0x4030 kernel/sched/core.c:6562
 schedule+0xb9/0x180 kernel/sched/core.c:6638
 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: 0 PID: 11754 Comm: syz.4.2137 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
RIP: 0010:arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
RIP: 0010:kvm_wait+0x159/0x1b0 arch/x86/kernel/kvm.c:1064
Code: 89 df 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 4b 0f b6 1f e8 07 03 50 00 44 38 e3 75 10 66 90 0f 00 2d c9 f3 50 09 fb f4 <e9> 16 ff ff ff fb e9 10 ff ff ff e8 57 c6 f7 08 89 f9 80 e1 07 38
RSP: 0018:ffffc9000c617880 EFLAGS: 00000246
RAX: 021a482fb456e300 RBX: 0000000000000003 RCX: 021a482fb456e300
RDX: dffffc0000000000 RSI: ffffffff8a8c17a0 RDI: ffffffff8adf42e0
RBP: ffffc9000c617930 R08: ffffffff90b10317 R09: 1ffffffff2162062
R10: dffffc0000000000 R11: fffffbfff2162063 R12: 0000000000000003
R13: dffffc0000000000 R14: dffffc0000000000 R15: 1ffff920018c2f10
FS:  000055555af6d500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc375e27dac CR3: 000000007ad4e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 pv_wait arch/x86/include/asm/paravirt.h:603 [inline]
 pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline]
 __pv_queued_spin_lock_slowpath+0x60f/0x9c0 kernel/locking/qspinlock.c:511
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:591 [inline]
 queued_spin_lock_slowpath+0x43/0x50 arch/x86/include/asm/qspinlock.h:51
 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
 do_raw_spin_lock+0x265/0x2f0 kernel/locking/spinlock_debug.c:115
 spin_lock include/linux/spinlock.h:351 [inline]
 futex_unqueue+0x4a/0xf0 kernel/futex/core.c:597
 futex_wait+0x1ed/0x5c0 kernel/futex/waitwake.c:660
 do_futex+0x310/0x320 kernel/futex/syscalls.c:134
 __do_sys_futex kernel/futex/syscalls.c:211 [inline]
 __se_sys_futex+0x381/0x410 kernel/futex/syscalls.c:192
 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: 0033:0x7f66ce99de99
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:00007ffe44f9b938 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00000000000737c7 RCX: 00007f66ce99de99
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f66cec25fac
RBP: 0000000000000032 R08: 00017e69f2109336 R09: 0000000000000000
R10: 00007ffe44f9ba40 R11: 0000000000000246 R12: 00007ffe44f9ba60
R13: 00007f66cec25fac R14: 00000000000737f9 R15: 00007ffe44f9ba40
 </TASK>