rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=6d5/1/0x4000000000000000 softirq=41603/41603 fqs=0 
	(detected by 1, t=10505 jiffies, g=45725, q=1803)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 11309 Comm: syz.1.6339 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4702 [inline]
RIP: 0010:__lock_acquire+0x702/0x7c60 kernel/locking/lockdep.c:4962
Code: 5c c5 00 48 89 d8 48 c1 e8 03 42 0f b6 04 00 84 c0 75 45 8b 1b 48 8b 44 24 58 42 0f b6 04 00 84 c0 75 55 48 8b 44 24 18 33 18 <41> ff ce 49 ff cf f7 c3 00 60 00 00 74 a8 e9 22 01 00 00 48 c7 c7
RSP: 0000:ffffc90004d270c0 EFLAGS: 00000002
RAX: ffff88807acbc708 RBX: 00000000000f818f RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8ffbd0c0
RBP: ffffc90004d27310 R08: dffffc0000000000 R09: fffffbfff1ff7a19
R10: fffffbfff1ff7a19 R11: 1ffffffff1ff7a18 R12: 0000000000000000
R13: ffff88807acbc690 R14: 0000000000000002 R15: 0000000000000000
FS:  00005555604a5500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b34063fff CR3: 000000005bb42000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 lock_acquire+0x197/0x3f0 kernel/locking/lockdep.c:5623
 rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:312
 rcu_read_lock include/linux/rcupdate.h:739 [inline]
 __perf_event_output kernel/events/core.c:7800 [inline]
 perf_event_output_forward+0x9e/0x280 kernel/events/core.c:7822
 __perf_event_overflow+0x364/0x530 kernel/events/core.c:9515
 perf_tp_event+0x32c/0xb50 kernel/events/core.c:10047
 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10021
 perf_trace_preemptirq_template+0x2be/0x380 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+0x84/0x480 kernel/rcu/tree_plugin.h:674
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 ad 13 9e 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0000:ffffc90004d27ac0 EFLAGS: 00000206
RAX: 6a612c127b21f600 RBX: 1ffff920009a4f5c RCX: 6a612c127b21f600
RDX: dffffc0000000000 RSI: ffffffff8a0b1820 RDI: ffffffff8a59a4c0
RBP: ffffc90004d27b98 R08: dffffc0000000000 R09: fffffbfff1ff7a19
R10: fffffbfff1ff7a19 R11: 1ffffffff1ff7a18 R12: ffffffff8c120b00
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
 rcu_read_unlock include/linux/rcupdate.h:771 [inline]
 __unlock_page_memcg+0xea/0x100 mm/memcontrol.c:2093
 do_set_pte+0x3c9/0x530 mm/memory.c:4069
 finish_fault+0x52e/0x8d0 mm/memory.c:4143
 do_shared_fault mm/memory.c:4336 [inline]
 do_fault mm/memory.c:4396 [inline]
 handle_pte_fault mm/memory.c:4650 [inline]
 __handle_mm_fault mm/memory.c:4785 [inline]
 handle_mm_fault+0x2157/0x43c0 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: 0033:0x7f89c65a31f1
Code: 65 5a ff ff 48 8b 05 86 45 eb 00 0f b6 4c 24 10 be 08 00 00 00 48 89 df 83 05 62 45 eb 00 01 48 8d 50 ff 48 89 15 67 45 eb 00 <88> 48 ff 8b 2d 4e 45 eb 00 e8 31 5a ff ff 48 8b 05 5a 45 eb 00 41
RSP: 002b:00007ffde43f8c80 EFLAGS: 00010202
RAX: 0000001b34064000 RBX: 00007f89c7457720 RCX: 0000000000000003
RDX: 0000001b34063fff RSI: 0000000000000008 RDI: 00007f89c7457720
RBP: 00007f89c6928038 R08: 0000000000000000 R09: 0000000000000000
R10: 00007f89c7457700 R11: 0000000000000000 R12: 00000000fffffc03
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10504 jiffies! g45725 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=16042
rcu: rcu_preempt kthread starved for 10505 jiffies! g45725 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:27008 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11bb/0x4390 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_timeout+0x15c/0x280 kernel/time/timer.c:1914
 rcu_gp_fqs_loop+0x29e/0x11b0 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0x98/0x350 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: 11309 Comm: syz.1.6339 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:arch_irqs_disabled_flags arch/x86/include/asm/irqflags.h:127 [inline]
RIP: 0010:irq_work_run_list+0x93/0x330 kernel/irq_work.c:170
Code: 29 e8 d1 32 f4 ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 4c 8b 74 24 40 4c 89 f6 48 81 e6 00 02 00 00 31 ff e8 8d 36 f4 ff <49> 81 e6 00 02 00 00 0f 85 87 02 00 00 48 89 d8 48 c1 e8 03 42 80
RSP: 0000:ffffc90000007f20 EFLAGS: 00000006
RAX: ffffffff818397a3 RBX: ffff8880b9033d78 RCX: ffff88807acbbb80
RDX: 0000000000010000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000007fd0 R08: dffffc0000000000 R09: ffffed1017207640
R10: ffffed1017207640 R11: 1ffff1101720763f R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000006 R15: 0000000000000000
FS:  00005555604a5500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b34063fff CR3: 000000005bb42000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __sysvec_irq_work+0x98/0x240 arch/x86/kernel/irq_work.c:22
 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline]
 sysvec_irq_work+0x98/0xc0 arch/x86/kernel/irq_work.c:17
 </IRQ>
 <TASK>
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713
RIP: 0010:rcu_read_unlock_special+0x84/0x480 kernel/rcu/tree_plugin.h:674
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 ad 13 9e 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0000:ffffc90004d27ac0 EFLAGS: 00000206
RAX: 6a612c127b21f600 RBX: 1ffff920009a4f5c RCX: 6a612c127b21f600
RDX: dffffc0000000000 RSI: ffffffff8a0b1820 RDI: ffffffff8a59a4c0
RBP: ffffc90004d27b98 R08: dffffc0000000000 R09: fffffbfff1ff7a19
R10: fffffbfff1ff7a19 R11: 1ffffffff1ff7a18 R12: ffffffff8c120b00
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
 rcu_read_unlock include/linux/rcupdate.h:771 [inline]
 __unlock_page_memcg+0xea/0x100 mm/memcontrol.c:2093
 do_set_pte+0x3c9/0x530 mm/memory.c:4069
 finish_fault+0x52e/0x8d0 mm/memory.c:4143
 do_shared_fault mm/memory.c:4336 [inline]
 do_fault mm/memory.c:4396 [inline]
 handle_pte_fault mm/memory.c:4650 [inline]
 __handle_mm_fault mm/memory.c:4785 [inline]
 handle_mm_fault+0x2157/0x43c0 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: 0033:0x7f89c65a31f1
Code: 65 5a ff ff 48 8b 05 86 45 eb 00 0f b6 4c 24 10 be 08 00 00 00 48 89 df 83 05 62 45 eb 00 01 48 8d 50 ff 48 89 15 67 45 eb 00 <88> 48 ff 8b 2d 4e 45 eb 00 e8 31 5a ff ff 48 8b 05 5a 45 eb 00 41
RSP: 002b:00007ffde43f8c80 EFLAGS: 00010202
RAX: 0000001b34064000 RBX: 00007f89c7457720 RCX: 0000000000000003
RDX: 0000001b34063fff RSI: 0000000000000008 RDI: 00007f89c7457720
RBP: 00007f89c6928038 R08: 0000000000000000 R09: 0000000000000000
R10: 00007f89c7457700 R11: 0000000000000000 R12: 00000000fffffc03
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>