rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=629c/1/0x4000000000000000 softirq=30911/30914 fqs=4
rcu: 	(detected by 0, t=10502 jiffies, g=41521, q=117 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 10391 Comm: syz-executor.1 Not tainted 6.6.0-rc4-syzkaller-00158-gf291209eca5e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
RIP: 0010:__remove_hrtimer kernel/time/hrtimer.c:1111 [inline]
RIP: 0010:__run_hrtimer kernel/time/hrtimer.c:1668 [inline]
RIP: 0010:__hrtimer_run_queues+0x36e/0xd10 kernel/time/hrtimer.c:1752
Code: 48 89 d6 48 c1 ee 03 42 0f b6 04 3e 84 c0 0f 85 83 04 00 00 ff 02 48 89 74 24 50 42 0f b6 04 3e 84 c0 0f 85 99 04 00 00 ff 02 <4c> 89 e8 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 ef e8 cc 5d 6b 00
RSP: 0018:ffffc900001f0d60 EFLAGS: 00000006
RAX: 0000000000000000 RBX: ffff8880b992b988 RCX: ffff88801cf53b80
RDX: ffff8880b992b950 RSI: 1ffff1101732572a RDI: ffffffff8b599c80
RBP: ffffc900001f0ea8 R08: ffffffff817d5d43 R09: 1ffffffff1d34fed
R10: dffffc0000000000 R11: fffffbfff1d34fee R12: ffff8880b992b840
R13: ffff8880b992b940 R14: ffff88802a796340 R15: dffffc0000000000
FS:  00007f1f233b56c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020074030 CR3: 0000000021290000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 hrtimer_interrupt+0x396/0x980 kernel/time/hrtimer.c:1814
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1063 [inline]
 __sysvec_apic_timer_interrupt+0x104/0x390 arch/x86/kernel/apic/apic.c:1080
 sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1074
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
RIP: 0010:lock_acquire+0x25a/0x520 kernel/locking/lockdep.c:5757
Code: 2b 00 74 08 4c 89 f7 e8 d4 95 7b 00 f6 44 24 61 02 0f 85 84 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25
RSP: 0018:ffffc900033b7900 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff92000676f2c RCX: ffffffff816d09f5
RDX: 0000000000000000 RSI: ffffffff8b0ab620 RDI: ffffffff8b599ce0
RBP: ffffc900033b7a58 R08: dffffc0000000000 R09: 1ffffffff20df876
R10: dffffc0000000000 R11: fffffbfff20df877 R12: 1ffff92000676f28
R13: dffffc0000000000 R14: ffffc900033b7960 R15: 0000000000000246
 __might_fault+0xc1/0x120 mm/memory.c:5896
 do_recvmmsg+0x5e1/0xae0 net/socket.c:2919
 __sys_recvmmsg net/socket.c:2992 [inline]
 __do_sys_recvmmsg net/socket.c:3015 [inline]
 __se_sys_recvmmsg net/socket.c:3008 [inline]
 __x64_sys_recvmmsg+0x199/0x240 net/socket.c:3008
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f1f2267cae9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1f233b50c8 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f1f2279c050 RCX: 00007f1f2267cae9
RDX: 0000000000010106 RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 00007f1f226c847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f1f2279c050 R15: 00007ffe51099248
 </TASK>
rcu: rcu_preempt kthread starved for 10494 jiffies! g41521 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:26504 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x196c/0x4af0 kernel/sched/core.c:6695
 schedule+0xc3/0x180 kernel/sched/core.c:6771
 schedule_timeout+0x1bd/0x300 kernel/time/timer.c:2167
 rcu_gp_fqs_loop+0x2c6/0x1010 kernel/rcu/tree.c:1613
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:1812
 kthread+0x2d3/0x370 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 PID: 11 Comm: kworker/u4:0 Not tainted 6.6.0-rc4-syzkaller-00158-gf291209eca5e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:300 [inline]
RIP: 0010:smp_call_function_many_cond+0x1805/0x2890 kernel/smp.c:844
Code: 45 8b 65 00 44 89 e6 83 e6 01 31 ff e8 64 59 0b 00 41 83 e4 01 49 bc 00 00 00 00 00 fc ff df 75 07 e8 9f 55 0b 00 eb 38 f3 90 <42> 0f b6 04 23 84 c0 75 11 41 f7 45 00 01 00 00 00 74 1e e8 83 55
RSP: 0018:ffffc90000107720 EFLAGS: 00000293
RAX: ffffffff8182b62d RBX: 1ffff110173282cd RCX: ffff88801667bb80
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000107920 R08: ffffffff8182b5fc R09: 1ffffffff20df870
R10: dffffc0000000000 R11: fffffbfff20df871 R12: dffffc0000000000
R13: ffff8880b9941668 R14: ffff8880b983d440 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f295fb78038 CR3: 000000000d130000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1012
 on_each_cpu include/linux/smp.h:71 [inline]
 text_poke_sync arch/x86/kernel/alternative.c:1993 [inline]
 text_poke_bp_batch+0x350/0xb20 arch/x86/kernel/alternative.c:2203
 text_poke_flush arch/x86/kernel/alternative.c:2394 [inline]
 text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2401
 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
 static_key_enable_cpuslocked+0x132/0x250 kernel/jump_label.c:205
 static_key_enable+0x1a/0x20 kernel/jump_label.c:218
 toggle_allocation_gate+0xb5/0x250 mm/kfence/core.c:830
 process_one_work kernel/workqueue.c:2630 [inline]
 process_scheduled_works+0x90f/0x1400 kernel/workqueue.c:2703
 worker_thread+0xa5f/0xff0 kernel/workqueue.c:2784
 kthread+0x2d3/0x370 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>