rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=a43/1/0x4000000000000002 softirq=21081/21081 fqs=0 
	(detected by 1, t=10504 jiffies, g=23569, q=5445)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 10470 Comm: syz.1.3003 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:rcu_preempt_read_enter kernel/rcu/tree_plugin.h:375 [inline]
RIP: 0010:__rcu_read_lock+0x25/0x50 kernel/rcu/tree_plugin.h:398
Code: 00 00 00 00 00 53 65 48 8b 1d 97 00 9d 7e 48 81 c3 3c 04 00 00 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 <84> c0 75 11 ff 03 8b 03 3d 00 00 00 40 7d 02 5b c3 0f 0b eb fa 89
RSP: 0000:ffffc9000d4973b0 EFLAGS: 00000807
RAX: 0000000000000000 RBX: ffff8880243e5d7c RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffffc9000d4975c0 RDI: ffff88807860a3d0
RBP: ffffc9000d4974d0 R08: ffff88807860a843 R09: 1ffff1100f0c1508
R10: dffffc0000000000 R11: ffffed100f0c1509 R12: dffffc0000000000
R13: 1ffff92001a92e7c R14: dffffc0000000000 R15: ffffc9000d4975c0
FS:  000055555f8ec500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa750b1d000 CR3: 000000001e501000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 rcu_read_lock include/linux/rcupdate.h:738 [inline]
 __perf_event_output kernel/events/core.c:7800 [inline]
 perf_event_output_forward+0xb0/0x2e0 kernel/events/core.c:7822
 __perf_event_overflow+0x364/0x530 kernel/events/core.c:9515
 perf_tp_event+0x383/0xbf0 kernel/events/core.c:10047
 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10021
 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 12 ff 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: 0000:ffffc9000d497a00 EFLAGS: 00000206
RAX: 5c24f65de12e1800 RBX: 1ffff92001a92f44 RCX: 5c24f65de12e1800
RDX: dffffc0000000000 RSI: ffffffff8a2b1c00 RDI: ffffffff8a79e740
RBP: ffffc9000d497ad0 R08: ffffffff901b70c7 R09: 1ffffffff2036e18
R10: dffffc0000000000 R11: fffffbfff2036e19 R12: ffffffff8c320c00
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]
 __unlock_page_memcg+0xea/0x100 mm/memcontrol.c:2093
 wp_page_copy+0xef5/0x2050 mm/memory.c:3148
 handle_pte_fault mm/memory.c:4668 [inline]
 __handle_mm_fault mm/memory.c:4785 [inline]
 handle_mm_fault+0x1f06/0x4410 mm/memory.c:4883
 do_user_addr_fault+0x489/0xc80 arch/x86/mm/fault.c:1357
 handle_page_fault arch/x86/mm/fault.c:1445 [inline]
 exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1501
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0033:0x7fa75076e503
Code: 53 48 83 ec 38 80 3d 1b eb 3a 00 00 89 7c 24 18 48 89 74 24 28 0f 85 cd 09 00 00 80 3d ea 21 ee 00 00 49 89 f1 41 89 d2 89 cb <c6> 05 f6 ea 3a 00 01 41 89 d7 0f 85 45 04 00 00 80 3d b6 21 ee 00
RSP: 002b:00007ffd45d03900 EFLAGS: 00010246
RAX: 00007fa750b20fa0 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000003 RSI: 00007fa750b21038 RDI: 0000000000000000
RBP: 00007fa750b20fb0 R08: 0000000000000000 R09: 00007fa750b21038
R10: 0000000000000003 R11: 0000000000000000 R12: 00007fa750b20fa0
R13: 0000200000000000 R14: 00007ffd45d03978 R15: 00007fa750b20fa0
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10503 jiffies! g23569 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=11386
rcu: rcu_preempt kthread starved for 10504 jiffies! g23569 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:27728 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:1914
 rcu_gp_fqs_loop+0x2be/0x11d0 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0x9b/0x370 kernel/rcu/tree.c:2145
 kthread+0x436/0x520 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: 10470 Comm: syz.1.3003 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:perf_tp_event+0x4c8/0xbf0 kernel/events/core.c:10054
Code: ff ff be 08 00 00 00 48 89 54 24 08 e8 41 a1 25 00 48 8b 54 24 08 e9 51 ff ff ff e8 62 9c e0 ff 48 bb 00 00 00 00 00 fc ff df <4d> 85 f6 0f 85 0d fd ff ff e8 4a 9c e0 ff e9 92 05 00 00 e8 40 9c
RSP: 0000:ffffc9000d497540 EFLAGS: 00000093
RAX: ffffffff819873ee RBX: dffffc0000000000 RCX: ffff8880243e5940
RDX: 0000000000000000 RSI: ffffffff8a2b2ea0 RDI: ffff88807860a6b0
RBP: ffffc9000d4977c8 R08: ffffffff8d8956ef R09: 1ffffffff1b12add
R10: dffffc0000000000 R11: fffffbfff1b12ade R12: ffff8880b90351a8
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  000055555f8ec500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa750b1d000 CR3: 000000001e501000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10021
 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 12 ff 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: 0000:ffffc9000d497a00 EFLAGS: 00000206
RAX: 5c24f65de12e1800 RBX: 1ffff92001a92f44 RCX: 5c24f65de12e1800
RDX: dffffc0000000000 RSI: ffffffff8a2b1c00 RDI: ffffffff8a79e740
RBP: ffffc9000d497ad0 R08: ffffffff901b70c7 R09: 1ffffffff2036e18
R10: dffffc0000000000 R11: fffffbfff2036e19 R12: ffffffff8c320c00
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]
 __unlock_page_memcg+0xea/0x100 mm/memcontrol.c:2093
 wp_page_copy+0xef5/0x2050 mm/memory.c:3148
 handle_pte_fault mm/memory.c:4668 [inline]
 __handle_mm_fault mm/memory.c:4785 [inline]
 handle_mm_fault+0x1f06/0x4410 mm/memory.c:4883
 do_user_addr_fault+0x489/0xc80 arch/x86/mm/fault.c:1357
 handle_page_fault arch/x86/mm/fault.c:1445 [inline]
 exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1501
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0033:0x7fa75076e503
Code: 53 48 83 ec 38 80 3d 1b eb 3a 00 00 89 7c 24 18 48 89 74 24 28 0f 85 cd 09 00 00 80 3d ea 21 ee 00 00 49 89 f1 41 89 d2 89 cb <c6> 05 f6 ea 3a 00 01 41 89 d7 0f 85 45 04 00 00 80 3d b6 21 ee 00
RSP: 002b:00007ffd45d03900 EFLAGS: 00010246
RAX: 00007fa750b20fa0 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000003 RSI: 00007fa750b21038 RDI: 0000000000000000
RBP: 00007fa750b20fb0 R08: 0000000000000000 R09: 00007fa750b21038
R10: 0000000000000003 R11: 0000000000000000 R12: 00007fa750b20fa0
R13: 0000200000000000 R14: 00007ffd45d03978 R15: 00007fa750b20fa0
 </TASK>