rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=e524/1/0x4000000000000000 softirq=69446/69447 fqs=0
rcu: 	(detected by 1, t=10502 jiffies, g=77753, q=268 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 13401 Comm: syz.7.1757 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:__netif_schedule+0x1db/0x200
Code: 4d 85 f6 75 16 e8 65 0f 49 f8 eb 15 e8 5e 0f 49 f8 e8 19 80 2b 02 4d 85 f6 74 ea e8 4f 0f 49 f8 fb 48 83 c4 08 5b 41 5c 41 5d <41> 5e 41 5f 5d c3 cc cc cc cc cc e8 35 0f 49 f8 48 c7 c7 00 60 dc
RSP: 0018:ffffc90000007cf0 EFLAGS: 00000086
RAX: ffffffff897c93c7 RBX: ffffffff89b843bb RCX: ffff88810fbfbb00
RDX: 0000000000010000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: 0000000000000000 R08: ffff88811f1ea19f R09: 1ffff11023e3d433
R10: dffffc0000000000 R11: ffffed1023e3d434 R12: ffff88811cbbb400
R13: ffff88811f1ea000 R14: ffff88811f1ea208 R15: 18aa839b707017c5
FS:  0000555556d35500(0000) GS:ffff88818dc91000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6e499d3d58 CR3: 0000000104bfa000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 advance_sched+0xa3d/0xc20
 __hrtimer_run_queues+0x3c0/0xa20
 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:__sanitizer_cov_trace_switch+0x7/0x130
Code: 20 c3 cc cc cc cc cc 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 06 <48> 8b 4e 08 48 83 c1 f8 48 c1 c1 3d 48 83 f9 02 7f 1e 48 85 c9 74
RSP: 0018:ffffc900000e6f70 EFLAGS: 00000246
RAX: 0000000000000004 RBX: 1ffff9200001ceff RCX: 0000000000000000
RDX: ffff88810fbfbb00 RSI: ffffffff901768e0 RDI: 0000000000000001
RBP: 0000000000000001 R08: 1ffff9200001ce33 R09: 0000000000000005
R10: 0000000000000006 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff88810ca6e800 R14: 0000000000000001 R15: ffffc900000e7160
 mas_wr_walk_descend+0xdf/0x8c0
 mas_wr_store_type+0x163/0x19d0
 mas_preallocate+0x251/0x640
 commit_merge+0x21d/0x730
 vma_expand+0x87d/0xfa0
 vma_merge_new_range+0x6db/0x8d0
 mmap_region+0x1105/0x2290
 do_mmap+0xc39/0x10c0
 vm_mmap_pgoff+0x2c9/0x4f0
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6e48b9cb42
Code: 4f 01 00 0f 1f 44 00 00 41 f7 c1 ff 0f 00 00 75 27 55 89 cd 53 48 89 fb 48 85 ff 74 3b 41 89 ea 48 89 df b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 6e 5b 5d c3 0f 1f 00 48 c7 c0 e8 ff ff ff 64
RSP: 002b:00007ffee717ba48 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f6e48b9cb42
RDX: 0000000000000000 RSI: 0000000000021000 RDI: 0000000000000000
RBP: 0000000000020022 R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000020022 R11: 0000000000000246 R12: 00007ffee717bbb0
R13: ffffffffffffffc0 R14: 0000000000001000 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 10502 jiffies! g77753 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
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:27640 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: 1 UID: 0 PID: 9236 Comm: kworker/u10:16 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+0xfd8/0x13d0
Code: 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 00 eb e5 44 89 f1 80 e1 07
RSP: 0018:ffffc9000a177700 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88823c63c2c8 RCX: ffff888177a69d80
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000a177840 R08: ffffffff9030b3f7 R09: 1ffffffff206167e
R10: dffffc0000000000 R11: fffffbfff206167f R12: 1ffff110242085b9
R13: dffffc0000000000 R14: ffff888121042dc8 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8882a9291000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5ddef86980 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>
