rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 ticks this GP) idle=683/1/0x4000000000000002 softirq=100798/100798 fqs=0 
	(detected by 1, t=10502 jiffies, g=138685, q=87)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 5674 Comm: syz.9.7821 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:check_kcov_mode kernel/kcov.c:171 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x1b/0x60 kernel/kcov.c:205
Code: 89 de 5b e9 87 7c 44 00 00 00 cc cc 00 00 cc 48 8b 04 24 65 48 8b 0d 54 4c 89 7e 65 8b 15 55 4c 89 7e 81 e2 00 01 ff 00 74 11 <81> fa 00 01 00 00 75 35 83 b9 34 16 00 00 00 74 2c 8b 91 10 16 00
RSP: 0018:ffffc90000007260 EFLAGS: 00000006
RAX: ffffffff8198af27 RBX: 0000000000000000 RCX: ffff8880242f8000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000007340 R08: ffffffff8e6d22af R09: 1ffffffff1cda455
R10: dffffc0000000000 R11: fffffbfff1cda456 R12: 0000000000000001
R13: ffff8880b8e351c8 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f47da2c86c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000000a000 CR3: 000000007d5ae000 CR4: 00000000003506f0
DR0: 0000200000000d40 DR1: 0000200000000440 DR2: 00002000000007c0
DR3: 00002000000007c0 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 perf_swevent_event+0xb7/0x540 kernel/events/core.c:9627
 perf_tp_event+0x324/0xbe0 kernel/events/core.c:10057
 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10031
 perf_trace_preemptirq_template+0x2aa/0x360 include/trace/events/preemptirq.h:14
 trace_irq_enable_rcuidle+0x108/0x180 include/trace/events/preemptirq.h:40
 trace_hardirqs_on+0x57/0x80 kernel/trace/trace_preemptirq.c:44
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713
RIP: 0010:rcu_read_unlock_special+0x7f/0x4a0 kernel/rcu/tree_plugin.h:674
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 82 fc 9c 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc90000007760 EFLAGS: 00000206
RAX: 916f3a5ec0341800 RBX: 1ffff92000000ef0 RCX: 916f3a5ec0341800
RDX: dffffc0000000000 RSI: ffffffff8a2b2b60 RDI: ffffffff8a7a4bc0
RBP: ffffc90000007840 R08: ffffffff9104618f R09: 1ffffffff2208c31
R10: dffffc0000000000 R11: fffffbfff2208c32 R12: ffffffff8d123400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
 rcu_read_unlock include/linux/rcupdate.h:772 [inline]
 __ip_queue_xmit+0x127d/0x1c60 net/ipv4/ip_output.c:539
 __tcp_transmit_skb+0x1ca3/0x31e0 net/ipv4/tcp_output.c:1404
 tcp_delack_timer_handler+0x2f8/0x700 net/ipv4/tcp_timer.c:314
 tcp_delack_timer+0x18d/0x2f0 net/ipv4/tcp_timer.c:341
 call_timer_fn+0x17b/0x540 kernel/time/timer.c:1648
 expire_timers kernel/time/timer.c:1699 [inline]
 __run_timers+0x56c/0x810 kernel/time/timer.c:1970
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1983
 handle_softirqs+0x336/0x830 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:spin_unlock include/linux/spinlock.h:404 [inline]
RIP: 0010:__text_poke+0x677/0x7e0 arch/x86/kernel/alternative.c:1389
Code: 84 24 80 00 00 00 f7 84 24 80 00 00 00 00 02 00 00 c6 44 03 04 f8 75 75 41 f7 c6 00 02 00 00 74 01 fb 48 8b bc 24 c0 00 00 00 <e8> 24 e9 a6 08 48 b8 00 00 00 00 00 fc ff df c6 44 03 0c f8 48 c7
RSP: 0018:ffffc900040cfae0 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff92000819f68 RCX: 916f3a5ec0341800
RDX: dffffc0000000000 RSI: ffffffff8a2b2b60 RDI: ffff888017866060
RBP: ffffc900040cfc10 R08: ffffffff910460c7 R09: 1ffffffff2208c18
R10: dffffc0000000000 R11: fffffbfff2208c19 R12: ffff8880242f8000
R13: ffff888017867558 R14: 0000000000000282 R15: ffffffff854c78c8
 text_poke arch/x86/kernel/alternative.c:1413 [inline]
 text_poke_bp_batch+0x6a0/0x830 arch/x86/kernel/alternative.c:1720
 text_poke_flush arch/x86/kernel/alternative.c:1833 [inline]
 text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1840
 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146
 static_key_slow_inc_cpuslocked+0x121/0x210 kernel/jump_label.c:144
 static_key_slow_inc+0x16/0x20 kernel/jump_label.c:159
 bpf_enable_runtime_stats kernel/bpf/syscall.c:4504 [inline]
 bpf_enable_stats+0x101/0x140 kernel/bpf/syscall.c:4523
 __sys_bpf+0x5e1/0x6f0 kernel/bpf/syscall.c:4740
 __do_sys_bpf kernel/bpf/syscall.c:4761 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:4759 [inline]
 __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4759
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f47dc0b3559
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:00007f47da2c8028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f47dc33a180 RCX: 00007f47dc0b3559
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000020
RBP: 00007f47dc14ab20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f47dc33a218 R14: 00007f47dc33a180 R15: 00007ffe1fa14238
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g138685 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=63731
rcu: rcu_preempt kthread starved for 10502 jiffies! g138685 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:26976 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11c3/0x4350 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2117
 rcu_gp_fqs_loop+0x2be/0x11f0 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0x9a/0x370 kernel/rcu/tree.c:2145
 kthread+0x42e/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </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: 5674 Comm: syz.9.7821 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:kasan_mem_to_shadow include/linux/kasan.h:55 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x44/0x290 mm/kasan/generic.c:189
Code: 82 0e 02 00 00 49 89 f8 49 c1 e8 2f 41 81 f8 ff ff 01 00 0f 82 fa 01 00 00 49 bc 01 00 00 00 00 fc ff df 49 89 fe 49 c1 ee 03 <49> ba 00 00 00 00 00 fc ff df 4f 8d 1c 16 4c 8d 44 3e ff 4d 89 c1
RSP: 0018:ffffc90000006bb0 EFLAGS: 00000802
RAX: 0000000000000001 RBX: 0000000000000006 RCX: ffffffff815cfde1
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff91046188
RBP: ffffc90000006e28 R08: 000000000001ffff R09: 1ffffffff2208c32
R10: dffffc0000000000 R11: fffffbfff2208c33 R12: dffffc0000000001
R13: ffff8880242f8002 R14: 1ffffffff2208c31 R15: ffff8880242f8c00
FS:  00007f47da2c86c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000000a000 CR3: 000000007d5ae000 CR4: 00000000003506f0
DR0: 0000200000000d40 DR1: 0000200000000440 DR2: 00002000000007c0
DR3: 00002000000007c0 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 instrument_atomic_read include/linux/instrumented.h:71 [inline]
 test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline]
 hlock_class kernel/locking/lockdep.c:197 [inline]
 check_wait_context kernel/locking/lockdep.c:4784 [inline]
 __lock_acquire+0xa41/0x7d40 kernel/locking/lockdep.c:5070
 lock_acquire+0x19f/0x400 kernel/locking/lockdep.c:5737
 rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:313
 rcu_read_lock include/linux/rcupdate.h:740 [inline]
 __perf_output_begin kernel/events/ring_buffer.c:163 [inline]
 perf_output_begin_forward+0xa5/0xa30 kernel/events/ring_buffer.c:271
 __perf_event_output kernel/events/core.c:7814 [inline]
 perf_event_output_forward+0x19b/0x2e0 kernel/events/core.c:7832
 __perf_event_overflow+0x35f/0x550 kernel/events/core.c:9525
 perf_swevent_overflow kernel/events/core.c:9601 [inline]
 perf_swevent_event+0x4b8/0x540 kernel/events/core.c:9639
 perf_tp_event+0x324/0xbe0 kernel/events/core.c:10057
 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10031
 perf_trace_preemptirq_template+0x2aa/0x360 include/trace/events/preemptirq.h:14
 trace_irq_enable_rcuidle+0x108/0x180 include/trace/events/preemptirq.h:40
 trace_hardirqs_on+0x57/0x80 kernel/trace/trace_preemptirq.c:44
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713
RIP: 0010:rcu_read_unlock_special+0x7f/0x4a0 kernel/rcu/tree_plugin.h:674
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 82 fc 9c 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc90000007760 EFLAGS: 00000206
RAX: 916f3a5ec0341800 RBX: 1ffff92000000ef0 RCX: 916f3a5ec0341800
RDX: dffffc0000000000 RSI: ffffffff8a2b2b60 RDI: ffffffff8a7a4bc0
RBP: ffffc90000007840 R08: ffffffff9104618f R09: 1ffffffff2208c31
R10: dffffc0000000000 R11: fffffbfff2208c32 R12: ffffffff8d123400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
 rcu_read_unlock include/linux/rcupdate.h:772 [inline]
 __ip_queue_xmit+0x127d/0x1c60 net/ipv4/ip_output.c:539
 __tcp_transmit_skb+0x1ca3/0x31e0 net/ipv4/tcp_output.c:1404
 tcp_delack_timer_handler+0x2f8/0x700 net/ipv4/tcp_timer.c:314
 tcp_delack_timer+0x18d/0x2f0 net/ipv4/tcp_timer.c:341
 call_timer_fn+0x17b/0x540 kernel/time/timer.c:1648
 expire_timers kernel/time/timer.c:1699 [inline]
 __run_timers+0x56c/0x810 kernel/time/timer.c:1970
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1983
 handle_softirqs+0x336/0x830 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:spin_unlock include/linux/spinlock.h:404 [inline]
RIP: 0010:__text_poke+0x677/0x7e0 arch/x86/kernel/alternative.c:1389
Code: 84 24 80 00 00 00 f7 84 24 80 00 00 00 00 02 00 00 c6 44 03 04 f8 75 75 41 f7 c6 00 02 00 00 74 01 fb 48 8b bc 24 c0 00 00 00 <e8> 24 e9 a6 08 48 b8 00 00 00 00 00 fc ff df c6 44 03 0c f8 48 c7
RSP: 0018:ffffc900040cfae0 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff92000819f68 RCX: 916f3a5ec0341800
RDX: dffffc0000000000 RSI: ffffffff8a2b2b60 RDI: ffff888017866060
RBP: ffffc900040cfc10 R08: ffffffff910460c7 R09: 1ffffffff2208c18
R10: dffffc0000000000 R11: fffffbfff2208c19 R12: ffff8880242f8000
R13: ffff888017867558 R14: 0000000000000282 R15: ffffffff854c78c8
 text_poke arch/x86/kernel/alternative.c:1413 [inline]
 text_poke_bp_batch+0x6a0/0x830 arch/x86/kernel/alternative.c:1720
 text_poke_flush arch/x86/kernel/alternative.c:1833 [inline]
 text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1840
 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146
 static_key_slow_inc_cpuslocked+0x121/0x210 kernel/jump_label.c:144
 static_key_slow_inc+0x16/0x20 kernel/jump_label.c:159
 bpf_enable_runtime_stats kernel/bpf/syscall.c:4504 [inline]
 bpf_enable_stats+0x101/0x140 kernel/bpf/syscall.c:4523
 __sys_bpf+0x5e1/0x6f0 kernel/bpf/syscall.c:4740
 __do_sys_bpf kernel/bpf/syscall.c:4761 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:4759 [inline]
 __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4759
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f47dc0b3559
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:00007f47da2c8028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f47dc33a180 RCX: 00007f47dc0b3559
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000020
RBP: 00007f47dc14ab20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f47dc33a218 R14: 00007f47dc33a180 R15: 00007ffe1fa14238
 </TASK>