rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=4fcc/1/0x4000000000000000 softirq=123726/123727 fqs=4
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P8047/1:b..l P20456/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=129493, q=674 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 20445 Comm: syz.1.2359 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:rb_erase_linked+0xb4/0x190
Code: 00 74 39 4c 89 ef 48 89 14 24 e8 87 93 8d f6 eb 27 4c 8d 6b 08 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 <74> 10 4c 89 ef 48 89 14 24 e8 5e 93 8d f6 48 8b 14 24 49 89 55 00
RSP: 0018:ffffc90000a08d48 EFLAGS: 00000046
RAX: 1ffff110478c5084 RBX: ffff88823c628418 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffff88823c628418 RDI: ffff88816d4ef300
RBP: ffff88816d4ef320 R08: ffffffff9a6d3ffb R09: 1ffffffff34da7ff
R10: dffffc0000000000 R11: fffffbfff34da800 R12: 1ffff1102da9de64
R13: ffff88823c628420 R14: 1ffff1102da9de63 R15: ffff88816d4ef300
FS:  0000000000000000(0000) GS:ffff8882a9290000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa39fff6990 CR3: 000000000e74a000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 __remove_hrtimer+0xf7/0x3e0
 __hrtimer_run_queues+0x299/0xa20
 hrtimer_interrupt+0x44b/0x950
 __sysvec_apic_timer_interrupt+0x102/0x430
 sysvec_apic_timer_interrupt+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:__unwind_start+0x521/0x760
Code: 0f 84 ce fb ff ff 4c 8d 7b 08 4c 8d 6b 10 48 8b 44 24 10 48 83 c0 08 48 89 44 24 20 4c 89 fd 48 c1 ed 03 4d 89 ee 49 c1 ee 03 <80> 7c 35 00 00 74 12 4c 89 ff e8 e0 ee b9 00 48 be 00 00 00 00 00
RSP: 0018:ffffc90003477308 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffffc90003477368 RCX: 0000000000000046
RDX: 0000000000000001 RSI: dffffc0000000000 RDI: ffff88810ec85880
RBP: 1ffff9200068ee6e R08: ffffc90003477358 R09: 0000000000000000
R10: ffffc900034773b8 R11: fffff5200068ee79 R12: ffffc900034773a0
R13: ffffc90003477378 R14: 1ffff9200068ee6f R15: ffffc90003477370
 arch_stack_walk+0xe3/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_stack+0x3e/0x60
 kasan_record_aux_stack+0xbd/0xd0
 call_rcu+0xee/0x890
 kmem_cache_free+0x462/0x650
 tear_down_vmas+0x312/0x520
 exit_mmap+0x4b6/0x9e0
 __mmput+0x118/0x430
 exit_mm+0x18e/0x250
 do_exit+0x6a2/0x22c0
 do_group_exit+0x21b/0x2d0
 get_signal+0x1284/0x1330
 arch_do_signal_or_restart+0xbc/0x830
 exit_to_user_mode_loop+0x86/0x480
 do_syscall_64+0x33e/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa3a1d9cdd9
Code: Unable to access opcode bytes at 0x7fa3a1d9cdaf.
RSP: 002b:00007fa39ffd50e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fa3a2016098 RCX: 00007fa3a1d9cdd9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fa3a2016098
RBP: 00007fa3a2016090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa3a2016128 R14: 00007ffe044fecc0 R15: 00007ffe044feda8
 </TASK>
task:rm              state:R  running task     stack:24088 pid:20456 tgid:20456 ppid:20453  task_flags:0x400000 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 preempt_schedule_irq+0x4d/0xa0
 irqentry_exit+0x14f/0x730
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_release+0x2d7/0x3c0
Code: 73 97 11 00 00 00 00 eb b5 e8 45 53 06 0a f7 c3 00 02 00 00 74 b9 65 48 8b 05 35 2e 97 11 48 3b 44 24 28 75 44 fb 48 83 c4 30 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 da 47 09 0a cc 48 8d 3d 72 3a 92
RSP: 0018:ffffc900034072a0 EFLAGS: 00000286
RAX: 782eea77d6846400 RBX: 0000000000000202 RCX: 0000000000000046
RDX: 0000000000000000 RSI: ffffffff8e218de6 RDI: ffffffff8c28b5e0
RBP: ffff88810bf76410 R08: ffffc90003407db0 R09: 0000000000000000
R10: ffffc900034073f8 R11: fffff52000680e81 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff8e95cda0 R15: ffff88810bf75880
 unwind_next_frame+0x1bba/0x2550
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_stack+0x3e/0x60
 kasan_record_aux_stack+0xbd/0xd0
 call_rcu+0xee/0x890
 kmem_cache_free+0x462/0x650
 __fput_deferred+0x2a3/0x380
 fput_close+0x11f/0x240
 path_openat+0x311d/0x3860
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x113/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f870408aa46
RSP: 002b:00007fff657e1498 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fff657e16f8 RCX: 00007f870408aa46
RDX: 0000000000080000 RSI: 00007fff657e1510 RDI: 00000000ffffff9c
RBP: 00007fff657e1500 R08: 0000000000080000 R09: 00007fff657e1510
R10: 0000000000000000 R11: 0000000000000287 R12: 00007fff657e1510
R13: 0000000000000005 R14: 00007fff657e16df R15: 00000000ffffffff
 </TASK>
task:kworker/1:8     state:R  running task     stack:21016 pid:8047  tgid:8047  ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events_power_efficient gc_worker
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 preempt_schedule_irq+0x4d/0xa0
 irqentry_exit+0x14f/0x730
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_acquire+0x221/0x350
Code: ff ff ff e8 e1 84 06 0a f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 cb 5f 97 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 98 68 92
RSP: 0018:ffffc9000602f940 EFLAGS: 00000282
RAX: 52cac8962227fa00 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 00000000dddc9517 RSI: ffffffff8e218de6 RDI: ffffffff8c28b5e0
RBP: ffffffff89cbb02d R08: ffffffff89cbb02d R09: ffffffff8e95cda0
R10: dffffc0000000000 R11: fffffbfff206165f R12: 0000000000000002
R13: ffffffff8e95cda0 R14: 0000000000000000 R15: 0000000000000246
 gc_worker+0x281/0x1290
 process_scheduled_works+0xb5d/0x1860
 worker_thread+0xa53/0xfc0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: rcu_preempt kthread starved for 10494 jiffies! g129493 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:27544 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 schedule+0x164/0x360
 schedule_timeout+0x158/0x2c0
 rcu_gp_fqs_loop+0x312/0x11d0
 rcu_gp_kthread+0x9e/0x2b0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 1111 Comm: kworker/u9:5 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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:smp_call_function_many_cond+0xfcf/0x13d0
Code: 79 45 8b 2e 44 89 ee 83 e6 01 31 ff e8 fa fc 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 a5 f8 0b 00 eb 37 f3 90 <43> 0f b6 04 2c 84 c0 75 10 41 f7 06 01 00 00 00 74 1e e8 8a f8 0b
RSP: 0018:ffffc9000720f700 EFLAGS: 00000293
RAX: ffffffff81b9abb6 RBX: ffff88812103c2c8 RCX: ffff888103bcd880
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000720f840 R08: ffffffff9030b2f7 R09: 1ffffffff206165e
R10: dffffc0000000000 R11: fffffbfff206165f R12: 1ffff110478c8199
R13: dffffc0000000000 R14: ffff88823c640cc8 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88818dc90000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f228f7e8158 CR3: 000000000e74a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80
 smp_text_poke_batch_finish+0x5f5/0x1160
 arch_jump_label_transform_apply+0x1c/0x30
 static_key_enable_cpuslocked+0x128/0x240
 static_key_enable+0x1a/0x20
 toggle_allocation_gate+0xab/0x290
 process_scheduled_works+0xb5d/0x1860
 worker_thread+0xa53/0xfc0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
