rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (1 GPs behind) idle=922/1/0x4000000000000000 softirq=157466/157467 fqs=44 
	(t=10500 jiffies g=296181 q=643)
rcu: rcu_preempt kthread starved for 10402 jiffies! g296181 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:I stack:28864 pid:   14 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:4681 [inline]
 __schedule+0x93a/0x26f0 kernel/sched/core.c:5938
 schedule+0xd3/0x270 kernel/sched/core.c:6017
 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881
 rcu_gp_fqs_loop kernel/rcu/tree.c:1996 [inline]
 rcu_gp_kthread+0xd34/0x1980 kernel/rcu/tree.c:2169
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
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: 109 Comm: kworker/u4:3 Not tainted 5.14.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:440 [inline]
RIP: 0010:smp_call_function_many_cond+0x452/0xc20 kernel/smp.c:967
Code: 0b 00 85 ed 74 4d 48 b8 00 00 00 00 00 fc ff df 4d 89 f4 4c 89 f5 49 c1 ec 03 83 e5 07 49 01 c4 83 c5 03 e8 d0 47 0b 00 f3 90 <41> 0f b6 04 24 40 38 c5 7c 08 84 c0 0f 85 33 06 00 00 8b 43 08 31
RSP: 0018:ffffc9000127fa00 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff8880b9d570c0 RCX: 0000000000000000
RDX: ffff8880143b54c0 RSI: ffffffff816a5ff0 RDI: 0000000000000003
RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff816a6016 R11: 0000000000000000 R12: ffffed10173aae19
R13: 0000000000000001 R14: ffff8880b9d570c8 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f09f4e53718 CR3: 000000000b68e000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 on_each_cpu_cond_mask+0x56/0xa0 kernel/smp.c:1133
 on_each_cpu include/linux/smp.h:71 [inline]
 text_poke_sync arch/x86/kernel/alternative.c:929 [inline]
 text_poke_bp_batch+0x1b3/0x560 arch/x86/kernel/alternative.c:1114
 text_poke_flush arch/x86/kernel/alternative.c:1268 [inline]
 text_poke_flush arch/x86/kernel/alternative.c:1265 [inline]
 text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1275
 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146
 jump_label_update+0x1d5/0x430 kernel/jump_label.c:830
 static_key_enable_cpuslocked+0x1b1/0x260 kernel/jump_label.c:177
 static_key_enable+0x16/0x20 kernel/jump_label.c:190
 toggle_allocation_gate mm/kfence/core.c:623 [inline]
 toggle_allocation_gate+0x100/0x390 mm/kfence/core.c:615
 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
NMI backtrace for cpu 1
CPU: 1 PID: 5578 Comm: syz-executor.4 Not tainted 5.14.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105
 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:342
 print_cpu_stall kernel/rcu/tree_stall.h:625 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:700 [inline]
 rcu_pending kernel/rcu/tree.c:3922 [inline]
 rcu_sched_clock_irq.cold+0x9f/0x747 kernel/rcu/tree.c:2641
 update_process_times+0x16d/0x200 kernel/time/timer.c:1785
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1421
 __run_hrtimer kernel/time/hrtimer.c:1537 [inline]
 __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1601
 hrtimer_interrupt+0x330/0xa00 kernel/time/hrtimer.c:1663
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1106
 sysvec_apic_timer_interrupt+0x40/0xc0 arch/x86/kernel/apic/apic.c:1100
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x38/0x70 kernel/locking/spinlock.c:191
Code: 74 24 10 e8 8a 0a 2e f8 48 89 ef e8 32 80 2e f8 81 e3 00 02 00 00 75 25 9c 58 f6 c4 02 75 2d 48 85 db 74 01 fb bf 01 00 00 00 <e8> f3 5d 22 f8 65 8b 05 9c d8 d4 76 85 c0 74 0a 5b 5d c3 e8 d0 b8
RSP: 0000:ffffc90000dc0c08 EFLAGS: 00000206
RAX: 0000000000000006 RBX: 0000000000000200 RCX: 1ffffffff1fa4fca
RDX: 0000000000000000 RSI: 0000000000000102 RDI: 0000000000000001
RBP: ffff8880b9d40240 R08: 0000000000000001 R09: ffffffff8fcd597f
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000100023fe7
R13: ffff8880b9d40240 R14: 0000000000000000 R15: 00000000ffffffff
 __mod_timer+0x837/0xe30 kernel/time/timer.c:1065
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
 expire_timers kernel/time/timer.c:1466 [inline]
 __run_timers.part.0+0x675/0xa20 kernel/time/timer.c:1734
 __run_timers kernel/time/timer.c:1715 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x16e/0x1c0 kernel/softirq.c:636
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:instrument_atomic_read include/linux/instrumented.h:71 [inline]
RIP: 0010:atomic_read include/asm-generic/atomic-instrumented.h:27 [inline]
RIP: 0010:lock_page_memcg+0x1bf/0x7d0 mm/memcontrol.c:2026
Code: 85 c1 81 58 e8 42 9c 99 ff 4d 85 ed 0f 85 a7 03 00 00 9c 58 f6 c4 02 0f 85 fc 03 00 00 4d 85 ed 74 01 fb 4c 8d ab 80 10 00 00 <be> 04 00 00 00 4c 89 ef e8 34 5f fa ff 4c 89 e8 48 be 00 00 00 00
RSP: 0000:ffffc900073b7aa8 EFLAGS: 00000206
RAX: 0000000000000002 RBX: ffff888140144000 RCX: 1ffffffff1f9ecfa
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900073b7af0 R08: 0000000000000001 R09: ffffffff8fcd58f7
R10: 0000000000000001 R11: 0000000000000000 R12: ffffea0001af6548
R13: ffff888140145080 R14: fffff9400035eca9 R15: ffffea0001af6540
 __set_page_dirty_buffers+0x20e/0x5d0 fs/buffer.c:638
 set_page_dirty+0x285/0x6b0 mm/page-writeback.c:2592
 block_page_mkwrite+0x259/0x310 fs/buffer.c:2525
 ext4_page_mkwrite+0xc3b/0x1a30 fs/ext4/inode.c:6085
 do_page_mkwrite+0x1a7/0x550 mm/memory.c:2870
 do_shared_fault mm/memory.c:4236 [inline]
 do_fault mm/memory.c:4304 [inline]
 handle_pte_fault mm/memory.c:4558 [inline]
 __handle_mm_fault+0x2b7d/0x5320 mm/memory.c:4693
 handle_mm_fault+0x1c8/0x790 mm/memory.c:4791
 do_user_addr_fault+0x48b/0x11c0 arch/x86/mm/fault.c:1390
 handle_page_fault arch/x86/mm/fault.c:1475 [inline]
 exc_page_fault+0x9e/0x180 arch/x86/mm/fault.c:1531
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:568
RIP: 0033:0x404143
Code: 5d c3 0f 1f 44 00 00 48 8b 0d 91 12 0a 01 48 8b 05 82 12 0a 01 4c 8d 81 00 00 00 01 48 39 c8 72 13 4c 39 c0 73 0e 48 8d 50 04 <89> 38 48 89 15 64 12 0a 01 c3 52 48 8d 35 26 a9 0b 00 48 89 c2 48
RSP: 002b:0000000000a9faa8 EFLAGS: 00010287
RAX: 0000001b2dd22000 RBX: 00007f8a4899a008 RCX: 0000001b2dd20000
RDX: 0000001b2dd22004 RSI: ffffffff81cde44b RDI: 000000000f0e1847
RBP: 0000000000000001 R08: 0000001b2ed20000 R09: 0000001b2dd2179c
R10: 0000000000001848 R11: 000000000f0e184b R12: 0000000000000481
R13: 0000000000560000 R14: ffffffff81cde44b R15: 000000000056c008