rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (0 ticks this GP) idle=93ac/1/0x4000000000000000 softirq=71630/71630 fqs=1
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P16780/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=64613, q=398 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 16802 Comm: syz.2.4774 Not tainted 6.16.0-rc1-syzkaller-00003-gf09079bd04a9 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:get_bucket lib/debugobjects.c:591 [inline]
RIP: 0010:debug_object_deactivate+0x75/0x250 lib/debugobjects.c:871
Code: e8 b9 df 0a 00 0f 85 43 01 00 00 48 bd 00 00 00 00 00 fc ff df 4c 89 e0 48 c1 e8 0c 48 b9 eb 83 b5 80 46 86 c8 61 48 0f af c8 <48> c1 e9 2f 83 e1 f8 4c 8d 3c c9 49 81 c7 60 79 c1 99 48 8d 1c c9
RSP: 0018:ffffc90000a08ca8 EFLAGS: 00000887
RAX: 000ffff88807dc22 RBX: ffffffff8b8cf340 RCX: a9583fac88e67936
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc90000a08cc0
RBP: dffffc0000000000 R08: ffffc90000a08cbf R09: 0000000000000000
R10: ffffc90000a08cb0 R11: fffff52000141198 R12: ffff88807dc22340
R13: dffffc0000000000 R14: 185266c75c99b052 R15: ffff8880b8727bc0
FS:  0000000000000000(0000) GS:ffff888125d86000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2fe1eff8 CR3: 000000000df38000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 debug_hrtimer_deactivate kernel/time/hrtimer.c:450 [inline]
 debug_deactivate+0x1d/0x200 kernel/time/hrtimer.c:490
 __run_hrtimer kernel/time/hrtimer.c:1729 [inline]
 __hrtimer_run_queues+0x2b0/0xc60 kernel/time/hrtimer.c:1825
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
 __sysvec_apic_timer_interrupt+0x108/0x410 arch/x86/kernel/apic/apic.c:1056
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:zap_present_folio_ptes mm/memory.c:1513 [inline]
RIP: 0010:zap_present_ptes mm/memory.c:1590 [inline]
RIP: 0010:do_zap_pte_range mm/memory.c:1691 [inline]
RIP: 0010:zap_pte_range mm/memory.c:1735 [inline]
RIP: 0010:zap_pmd_range mm/memory.c:1827 [inline]
RIP: 0010:zap_pud_range mm/memory.c:1856 [inline]
RIP: 0010:zap_p4d_range mm/memory.c:1877 [inline]
RIP: 0010:unmap_page_range+0x17b6/0x41c0 mm/memory.c:1898
Code: 8c 24 04 02 00 00 45 31 f6 e9 c0 05 00 00 e8 81 47 b8 ff 4c 89 fe 48 83 e6 20 31 ff e8 53 4c b8 ff 4c 89 f8 48 83 e0 20 75 0a <e8> 65 47 b8 ff e9 b0 04 00 00 48 8b 94 24 08 01 00 00 48 89 d0 48
RSP: 0018:ffffc900050bf5e0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0400000000000040 RCX: ffff88807f773c00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900050bf890 R08: ffff88801d65a7ff R09: 1ffff11003acb4ff
R10: dffffc0000000000 R11: ffffed1003acb500 R12: ffffea00017e1fd8
R13: 1ffffd40002fc3fb R14: ffff88805938c500 R15: 800000005f87f007
 unmap_single_vma mm/memory.c:1941 [inline]
 unmap_vmas+0x399/0x580 mm/memory.c:1985
 exit_mmap+0x248/0xb50 mm/mmap.c:1284
 __mmput+0x118/0x420 kernel/fork.c:1121
 exit_mm+0x1da/0x2c0 kernel/exit.c:581
 do_exit+0x640/0x22e0 kernel/exit.c:943
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1104
 __do_sys_exit_group kernel/exit.c:1115 [inline]
 __se_sys_exit_group kernel/exit.c:1113 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1113
 x64_sys_call+0x21ba/0x21c0 arch/x86/include/generated/asm/syscalls_64.h:232
 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: 0033:0x7f0b8cb8e929
Code: Unable to access opcode bytes at 0x7f0b8cb8e8ff.
RSP: 002b:00007ffca9527b88 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0b8cb8e929
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffca9527bec R08: 00000005a9527c7f R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 00000000000003d6
R13: 00000000000927c0 R14: 000000000005a10d R15: 00007ffca9527c40
 </TASK>
task:syz.4.4765      state:R  running task     stack:22888 pid:16780 tgid:16779 ppid:5824   task_flags:0x440740 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5396 [inline]
 __schedule+0x16a2/0x4cb0 kernel/sched/core.c:6785
 preempt_schedule_notrace+0xd1/0x110 kernel/sched/core.c:7058
 preempt_schedule_notrace_thunk+0x16/0x30 arch/x86/entry/thunk.S:13
 rcu_is_watching+0x7f/0xb0 kernel/rcu/tree.c:746
 rcu_read_lock include/linux/rcupdate.h:842 [inline]
 class_rcu_constructor include/linux/rcupdate.h:1155 [inline]
 unwind_next_frame+0xd4/0x2390 arch/x86/kernel/unwind_orc.c:479
 __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+0xf7/0x1f0 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:1704
 prep_new_page mm/page_alloc.c:1712 [inline]
 get_page_from_freelist+0x21d5/0x22b0 mm/page_alloc.c:3669
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4959
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2419
 alloc_frozen_pages_noprof mm/mempolicy.c:2490 [inline]
 alloc_pages_noprof+0xa9/0x190 mm/mempolicy.c:2510
 folio_alloc_noprof+0x1e/0x30 mm/mempolicy.c:2520
 filemap_alloc_folio_noprof+0xdf/0x470 mm/filemap.c:1007
 ractl_alloc_folio mm/readahead.c:186 [inline]
 page_cache_ra_unbounded+0x2b9/0x7b0 mm/readahead.c:270
 do_async_mmap_readahead mm/filemap.c:3299 [inline]
 filemap_fault+0x59e/0x1200 mm/filemap.c:3398
 __do_fault+0x135/0x390 mm/memory.c:5189
 do_read_fault mm/memory.c:5610 [inline]
 do_fault mm/memory.c:5744 [inline]
 do_pte_missing mm/memory.c:4251 [inline]
 handle_pte_fault mm/memory.c:6089 [inline]
 __handle_mm_fault+0x37ed/0x5620 mm/memory.c:6232
 handle_mm_fault+0x2d5/0x7f0 mm/memory.c:6401
 faultin_page mm/gup.c:1186 [inline]
 __get_user_pages+0x1af4/0x30b0 mm/gup.c:1488
 __get_user_pages_locked mm/gup.c:1754 [inline]
 get_dump_page+0x1ac/0x3f0 mm/gup.c:2258
 dump_user_range+0x1de/0xc70 fs/coredump.c:1180
 elf_core_dump+0x32ed/0x3900 fs/binfmt_elf.c:2075
 do_coredump+0x2806/0x3440 fs/coredump.c:950
 get_signal+0x10d9/0x1310 kernel/signal.c:3019
 arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop+0x75/0x110 kernel/entry/common.c:111
 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline]
 do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd76ff8e929
RSP: 002b:00007fd770d54fe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: 000000000000085d RBX: 00007fd7701b5fa0 RCX: 00007fd76ff8e929
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000042164000
RBP: 00007fd770010b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fd7701b5fa0 R15: 00007ffef161fc48
 </TASK>
rcu: rcu_preempt kthread starved for 10495 jiffies! g64613 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:27320 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5396 [inline]
 __schedule+0x16a2/0x4cb0 kernel/sched/core.c:6785
 __schedule_loop kernel/sched/core.c:6863 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6878
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2054
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2256
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3fc/0x770 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: 10349 Comm: kworker/u8:34 Not tainted 6.16.0-rc1-syzkaller-00003-gf09079bd04a9 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline]
RIP: 0010:smp_call_function_many_cond+0xf80/0x12d0 kernel/smp.c:885
Code: 00 00 00 00 00 fc ff df 75 07 e8 fb 73 0b 00 eb 37 f3 90 43 0f b6 04 2c 84 c0 75 10 41 f7 07 01 00 00 00 74 1e e8 e0 73 0b 00 <eb> e5 44 89 f9 80 e1 07 80 c1 03 38 c1 7c e3 4c 89 ff e8 49 c0 6c
RSP: 0018:ffffc9001aeb76a0 EFLAGS: 00000293
RAX: ffffffff81b4da10 RBX: ffff8880b863c9c0 RCX: ffff88801eb4bc00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9001aeb7800 R08: ffffffff8f9fdef7 R09: 1ffffffff1f3fbde
R10: dffffc0000000000 R11: fffffbfff1f3fbdf R12: 1ffff110170e825d
R13: dffffc0000000000 R14: 0000000000000001 R15: ffff8880b87412e8
FS:  0000000000000000(0000) GS:ffff888125c86000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4d3cb45ebb CR3: 000000000df38000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052
 on_each_cpu include/linux/smp.h:71 [inline]
 smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2660 [inline]
 smp_text_poke_batch_finish+0x5e0/0x1100 arch/x86/kernel/alternative.c:2870
 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
 static_key_enable_cpuslocked+0x128/0x250 kernel/jump_label.c:210
 static_key_enable+0x1a/0x20 kernel/jump_label.c:223
 toggle_allocation_gate+0xad/0x240 mm/kfence/core.c:850
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3321
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>