rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (0 ticks this GP) idle=fcfc/1/0x4000000000000000 softirq=16849/16849 fqs=2
rcu: 	(detected by 0, t=10506 jiffies, g=10549, q=783 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6602 Comm: syz.2.176 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:_raw_spin_unlock_irqrestore+0x32/0x110
Code: 41 57 41 56 41 54 53 48 83 e4 e0 48 83 ec 60 48 89 f3 49 89 fe 65 48 8b 05 eb e1 23 07 48 89 44 24 48 48 c7 04 24 b3 8a b5 41 <48> c7 44 24 08 27 44 a3 8d 48 c7 44 24 10 10 ce 7c 8b 49 89 e7 49
RSP: 0018:ffffc900001dfec0 EFLAGS: 00000086
RAX: 10baad23e7ca7600 RBX: 0000000000000806 RCX: ffff888027b4b980
RDX: 0000000000010100 RSI: 0000000000000806 RDI: ffff888136627a80
RBP: ffffc900001dff58 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200003bfc8 R12: ffff888106a88198
R13: ffff888136627b00 R14: ffff888136627a80 R15: 0000000000000806
FS:  00007f249d63e6c0(0000) GS:ffff8881a3c15000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32322ff8 CR3: 0000000024d66000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 hrtimer_try_to_cancel+0x3be/0x420
 hrtimer_cancel+0x3b/0x50
 cpu_clock_event_stop+0xd9/0x130
 __perf_event_overflow+0x580/0xe40
 perf_swevent_hrtimer+0x3c5/0x550
 __hrtimer_run_queues+0x4e0/0xc60
 hrtimer_interrupt+0x45b/0xaa0
 __sysvec_apic_timer_interrupt+0x10b/0x410
 sysvec_apic_timer_interrupt+0x52/0xc0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:rcu_is_watching+0x5a/0xb0
Code: f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 6c c1 7c 00 48 c7 c3 98 df a1 92 49 03 1e 48 89 d8 48 c1 e8 03 42 0f b6 04 38 <84> c0 75 34 8b 03 65 ff 0d d9 3f fa 10 74 11 83 e0 04 c1 e8 02 5b
RSP: 0018:ffffc900001e0718 EFLAGS: 00000a06
RAX: 0000000000000000 RBX: ffff888136632f98 RCX: 10baad23e7ca7600
RDX: 0000000000000000 RSI: ffffffff8be33be0 RDI: ffffffff8be33ba0
RBP: dffffc0000000000 R08: 0000000000000000 R09: ffffffff8172d195
R10: ffffc900001e0858 R11: ffffffff81ac4b00 R12: 1ffff9200003c101
R13: ffffc900001e0840 R14: ffffffff8dbe1d18 R15: dffffc0000000000
 unwind_next_frame+0xd4/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5b/0x80
 slab_free_after_rcu_debug+0x129/0x2a0
 rcu_core+0xcab/0x1770
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:preempt_schedule_irq+0xb0/0x150
Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 08 00 00 00 74 64 bf 01 00 00 00 e8 ab a8 14 f6 e8 16 05 4c f6 fb bf 01 00 00 00 <e8> 5b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc9000692f5c0 EFLAGS: 00000282
RAX: 10baad23e7ca7600 RBX: 0000000000000000 RCX: 10baad23e7ca7600
RDX: 0000000000000000 RSI: ffffffff8d9b9cae RDI: 0000000000000001
RBP: ffffc9000692f670 R08: ffffffff8fa3a637 R09: 1ffffffff1f474c6
R10: dffffc0000000000 R11: fffffbfff1f474c7 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000d25eb8
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:unwind_next_frame+0x130e/0x2390
Code: c1 e8 3f 48 01 c8 48 83 e0 fe 4c 8d 3c 45 00 00 00 00 49 01 ef 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 <84> c0 75 27 49 63 07 4c 01 f8 49 8d 4f 04 4c 39 e0 48 0f 46 e9 49
RSP: 0018:ffffc9000692f738 EFLAGS: 00000a03
RAX: 0000000000000000 RBX: ffffffff8fba6908 RCX: dffffc0000000000
RDX: ffffffff8fba6900 RSI: ffffffff9037df78 RDI: ffffffff8be33ba0
RBP: ffffffff8fba6900 R08: 0000000000000007 R09: ffffffff8172d195
R10: ffffc9000692f858 R11: ffffffff81ac4b00 R12: ffffffff81ac4aab
R13: ffffffff8fba6900 R14: ffffc9000692f808 R15: ffffffff8fba6904
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_cache_noprof+0x230/0x3d0
 ref_tracker_alloc+0x133/0x460
 sk_alloc+0x1b1/0x370
 inet_create+0x7a0/0x1000
 __sock_create+0x4b3/0x9f0
 __sys_socket+0xd7/0x1b0
 __x64_sys_socket+0x7a/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f249c78ec29
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:00007f249d63e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 00007f249c9d5fa0 RCX: 00007f249c78ec29
RDX: 0000000000000084 RSI: 0000000000000005 RDI: 0000000000000002
RBP: 00007f249c811e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f249c9d6038 R14: 00007f249c9d5fa0 R15: 00007ffe8bc60ea8
 </TASK>
rcu: rcu_preempt kthread starved for 10502 jiffies! g10549 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:27160 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_timeout+0x12b/0x270
 rcu_gp_fqs_loop+0x301/0x1540
 rcu_gp_kthread+0x99/0x390
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 28 Comm: kworker/u9:1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:__sanitizer_cov_trace_pc+0x37/0x70
Code: 08 b0 a0 92 65 8b 15 18 f1 e0 10 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 3c 16 00 00 00 74 2c 8b 91 18 16 00 00 <83> fa 02 75 21 48 8b 91 20 16 00 00 48 8b 32 48 8d 7e 01 8b 89 1c
RSP: 0018:ffffc9000061f658 EFLAGS: 00000246
RAX: ffffffff81b4601b RBX: 1ffff11026cc7f61 RCX: ffff88801caa1cc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000061f7e0 R08: ffffffff8fa3a637 R09: 1ffffffff1f474c6
R10: dffffc0000000000 R11: fffffbfff1f474c7 R12: ffff88813663fb08
R13: dffffc0000000000 R14: ffff88804b03b1c0 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880b8615000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3211eff8 CR3: 000000000df36000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 smp_call_function_many_cond+0xd4b/0x12d0
 on_each_cpu_cond_mask+0x3f/0x80
 smp_text_poke_batch_finish+0x5f9/0x1130
 arch_jump_label_transform_apply+0x1c/0x30
 static_key_enable_cpuslocked+0x128/0x250
 static_key_enable+0x1a/0x20
 toggle_allocation_gate+0xad/0x240
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
