rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=4c94/1/0x4000000000000000 softirq=28272/28296 fqs=0
rcu: 	(detected by 0, t=10506 jiffies, g=18965, q=120 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 7272 Comm: syz.7.292 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:hrtimer_cancel+0x3b/0x50 kernel/time/hrtimer.c:1483
Code: e8 9a f9 ff ff 89 c5 31 ff 89 c6 e8 cf 2c 12 00 85 ed 78 0c e8 86 28 12 00 eb 1a e8 7f 28 12 00 f3 90 48 89 df e8 75 f9 ff ff <85> c0 78 ed 89 c5 e8 6a 28 12 00 89 e8 5b 5d c3 cc cc cc cc cc 90
RSP: 0000:ffffc90000a08990 EFLAGS: 00000082
RAX: 00000000ffffffff RBX: ffff888056533fe8 RCX: 0000000000010000
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 00000000ffffffff
RBP: 00000000ffffffff R08: ffff8880b8927ac3 R09: 1ffff11017124f58
R10: dffffc0000000000 R11: ffffed1017124f59 R12: ffff888056534090
R13: dffffc0000000000 R14: ffff888056533fe8 R15: ffffffffffffb61d
FS:  00007fa9bc2806c0(0000) GS:ffff888126473000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa9bc2800e8 CR3: 000000001dabc000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 perf_swevent_cancel_hrtimer kernel/events/core.c:11830 [inline]
 cpu_clock_event_stop+0xd9/0x130 kernel/events/core.c:11880
 __perf_event_overflow+0x57d/0xe40 kernel/events/core.c:10346
 perf_swevent_hrtimer+0x3b8/0x500 kernel/events/core.c:11786
 __run_hrtimer kernel/time/hrtimer.c:1777 [inline]
 __hrtimer_run_queues+0x4dd/0xc60 kernel/time/hrtimer.c:1841
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline]
 __sysvec_apic_timer_interrupt+0x108/0x410 arch/x86/kernel/apic/apic.c:1058
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1052
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:on_stack arch/x86/include/asm/stacktrace.h:56 [inline]
RIP: 0010:stack_access_ok arch/x86/kernel/unwind_orc.c:393 [inline]
RIP: 0010:deref_stack_reg arch/x86/kernel/unwind_orc.c:403 [inline]
RIP: 0010:unwind_next_frame+0xaf5/0x2390 arch/x86/kernel/unwind_orc.c:585
Code: 00 00 00 fc ff df 80 7c 05 00 00 74 08 4c 89 ff e8 c0 b8 b0 00 4c 89 7c 24 60 48 89 5c 24 78 4d 8b 7e 08 49 8d 5e 10 49 89 dd <49> c1 ed 03 48 b8 00 00 00 00 00 fc ff df 41 80 7c 05 00 00 74 08
RSP: 0000:ffffc90003ddf0b8 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffffc90003ddf1f8 RCX: ffffffff8f700b20
RDX: ffffffff8fea32f6 RSI: 0000000000000002 RDI: ffffffff8b9ec280
RBP: 1ffff920007bbe3e R08: 0000000000000009 R09: ffffffff81725d05
R10: ffffc90003ddf1e8 R11: fffff520007bbe49 R12: ffffc90003ddf1e8
R13: ffffc90003ddf1f8 R14: ffffc90003ddf1e8 R15: ffffc90003dd8000
 __unwind_start+0x5b9/0x760 arch/x86/kernel/unwind_orc.c:758
 unwind_start arch/x86/include/asm/unwind.h:64 [inline]
 arch_stack_walk+0xe4/0x150 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 save_stack+0xf5/0x1f0 mm/page_owner.c:156
 __set_page_owner+0x8d/0x4a0 mm/page_owner.c:329
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851
 prep_new_page mm/page_alloc.c:1859 [inline]
 get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3858
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
 folio_alloc_mpol_noprof mm/mempolicy.c:2435 [inline]
 vma_alloc_folio_noprof+0xe4/0x200 mm/mempolicy.c:2470
 folio_prealloc+0x30/0x180 mm/memory.c:-1
 wp_page_copy mm/memory.c:3552 [inline]
 do_wp_page+0x1231/0x5800 mm/memory.c:4013
 handle_pte_fault mm/memory.c:6068 [inline]
 __handle_mm_fault+0x1033/0x5440 mm/memory.c:6195
 handle_mm_fault+0x40a/0x8e0 mm/memory.c:6364
 do_user_addr_fault+0xa7c/0x1380 arch/x86/mm/fault.c:1336
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x76/0xf0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7fa9bb25ef0b
Code: 00 74 24 80 3d e8 67 eb 00 00 0f b6 35 de 67 eb 00 75 4c 80 3d d9 67 eb 00 00 75 43 40 84 f6 75 3e 66 0f 1f 44 00 00 48 89 ef <e8> 70 fa ff ff 8b 45 0c 85 c0 75 35 48 8d 75 0c b9 40 42 0f 00 ba
RSP: 002b:00007fa9bc2800f0 EFLAGS: 00010246
RAX: 0000000000000001 RBX: 00007fa9bb5e6188 RCX: 00007fa9bb38eec9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fa9bb5e6180
RBP: 00007fa9bb5e6180 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa9bb5e6218 R14: 00007ffcf307dff0 R15: 00007ffcf307e0d8
 </TASK>
rcu: rcu_preempt kthread starved for 10506 jiffies! g18965 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:26792 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5325 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
 __schedule_loop kernel/sched/core.c:7011 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:7026
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x436/0x7d0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 7270 Comm: syz.7.292 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xd38/0x12d0 kernel/smp.c:877
Code: 89 ee 83 e6 01 31 ff e8 a6 73 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 51 6f 0b 00 eb 38 f3 90 42 0f b6 04 2b <84> c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 35 6f 0b 00 eb e4 44
RSP: 0018:ffffc90003e1f140 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 1ffff11017127f61 RCX: ffff88802db69e40
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90003e1f2c0 R08: ffffffff8f5cd537 R09: 1ffffffff1eb9aa6
R10: dffffc0000000000 R11: fffffbfff1eb9aa7 R12: ffff8880b893fb08
R13: dffffc0000000000 R14: ffff8880b883b1c0 R15: 0000000000000001
FS:  00007fa9bc2c26c0(0000) GS:ffff888126373000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000000 CR3: 000000001dabc000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline]
 flush_tlb_mm_range+0x6b1/0x12d0 arch/x86/mm/tlb.c:1451
 flush_tlb_page arch/x86/include/asm/tlbflush.h:324 [inline]
 ptep_clear_flush+0x120/0x170 mm/pgtable-generic.c:101
 wp_page_copy mm/memory.c:3618 [inline]
 do_wp_page+0x1bc2/0x5800 mm/memory.c:4013
 handle_pte_fault mm/memory.c:6068 [inline]
 __handle_mm_fault+0x1033/0x5440 mm/memory.c:6195
 handle_mm_fault+0x40a/0x8e0 mm/memory.c:6364
 do_user_addr_fault+0x764/0x1380 arch/x86/mm/fault.c:1387
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x76/0xf0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:__put_user_4+0xd/0x20 arch/x86/lib/putuser.S:94
Code: 66 89 01 31 c9 0f 01 ca e9 10 45 03 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 89 cb 48 c1 fb 3f 48 09 d9 0f 01 cb <89> 01 31 c9 0f 01 ca c3 cc cc cc cc 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90003e1fa38 EFLAGS: 00050206
RAX: 000000000000000f RBX: 0000000000000000 RCX: 0000200000000000
RDX: 0000000000000000 RSI: ffffffff8d71ebcb RDI: ffffffff8b9ec2e0
RBP: ffffc90003e1fc10 R08: 0000000000000000 R09: ffffffff820b7ee0
R10: dffffc0000000000 R11: ffffed100a796d90 R12: 0000000000001000
R13: ffff888079a4aa80 R14: 0000000000000000 R15: ffffc90003e1fdf0
 copy_process+0x1d5b/0x3c00 kernel/fork.c:2221
 kernel_clone+0x21e/0x840 kernel/fork.c:2610
 __do_sys_clone kernel/fork.c:2753 [inline]
 __se_sys_clone kernel/fork.c:2737 [inline]
 __x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2737
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa9bb38eec9
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:00007fa9bc2c1fe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fa9bb5e5fa0 RCX: 00007fa9bb38eec9
RDX: 0000200000000000 RSI: 0000000000000000 RDI: 0000000080001000
RBP: 00007fa9bb411f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007fa9bb5e6038 R14: 00007fa9bb5e5fa0 R15: 00007ffcf307e0d8
 </TASK>