rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=6e4c/1/0x4000000000000000 softirq=250081/250081 fqs=4
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P18798/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=283309, q=493 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 38 Comm: kcompactd0 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:__lock_acquire+0x5e6/0x2cf0
Code: 10 76 16 e8 4c 2a 2d 03 85 c0 74 0d 83 3d 65 ba b4 0e 00 0f 84 93 07 00 00 85 ed 0f 84 96 00 00 00 41 8b 45 20 66 85 c0 78 7e <65> 8b 0d 8f 40 ca 11 a9 00 00 03 00 74 33 85 c9 74 18 4c 89 f7 4c
RSP: 0018:ffffc90000006df8 EFLAGS: 00000006
RAX: 00000000000c6000 RBX: ffff888103aae578 RCX: 0000000000000003
RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffffff84de8e77 R09: 0000000000080000
R10: 0000000000000000 R11: ffffffff9a9a7e10 R12: 0000000000000002
R13: ffff888103aae558 R14: ffff888103aad940 R15: 0000000000000003
FS:  0000000000000000(0000) GS:ffff88818d954000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f86cb1aed40 CR3: 00000001bdfc8000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 lock_acquire+0x106/0x350
 _raw_spin_lock_irqsave+0x40/0x60
 debug_object_activate+0xb7/0x420
 enqueue_hrtimer+0xa9/0x2c0
 __hrtimer_run_queues+0x4ce/0xa10
 hrtimer_interrupt+0x448/0x910
 __sysvec_apic_timer_interrupt+0x102/0x430
 sysvec_apic_timer_interrupt+0x52/0xc0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:kasan_quarantine_put+0x6a/0x1f0
Code: 98 0f 6e 93 01 75 32 41 f7 c7 00 02 00 00 74 05 e8 7b 91 9a ff 9c 58 a9 00 02 00 00 75 78 41 f7 c7 00 02 00 00 74 01 fb 31 c0 <5b> 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc cc 48 8d 80 80 0f 6e 93
RSP: 0018:ffffc90000007390 EFLAGS: 00000206
RAX: 0000000000000001 RBX: ffff8881199f2480 RCX: 0000000080000101
RDX: 0000000000000000 RSI: ffffffff8e228b3b RDI: ffffffff8c4bbe80
RBP: 0000000000000000 R08: ffffffff90574737 R09: 1ffffffff20ae8e6
R10: dffffc0000000000 R11: fffffbfff20ae8e7 R12: ffff8881199f2480
R13: 0000000000000000 R14: 000000000005c2a0 R15: 0000000000000282
 kmem_cache_free+0x182/0x650
 tipc_disc_rcv+0x38a/0x910
 tipc_rcv+0xfaa/0x1040
 tipc_udp_recv+0x275/0x370
 udp_queue_rcv_one_skb+0xfc5/0x10e0
 udp_unicast_rcv_skb+0x21a/0x3a0
 udp_rcv+0xecb/0x1db0
 ip_protocol_deliver_rcu+0x27e/0x440
 ip_local_deliver_finish+0x3bb/0x6f0
 NF_HOOK+0x336/0x3c0
 NF_HOOK+0x336/0x3c0
 process_backlog+0xa34/0x1860
 __napi_poll+0xaa/0x330
 net_rx_action+0x61d/0xf50
 handle_softirqs+0x225/0x840
 __irq_exit_rcu+0xca/0x220
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:finish_task_switch+0x417/0xc60
Code: 04 00 00 41 c7 84 24 20 0e 00 00 00 00 00 00 0f 1f 44 00 00 49 83 c4 48 4c 89 e7 e8 53 dc 3d 0a e8 9e ab 39 00 fb 4c 8b 65 c8 <49> 8d bc 24 f8 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0
RSP: 0018:ffffc90000ae7780 EFLAGS: 00000202
RAX: 0000000000010b07 RBX: ffff88812103bf20 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8e228b3b RDI: ffffffff8c4bbe80
RBP: ffffc90000ae77d0 R08: ffffffff90574737 R09: 1ffffffff20ae8e6
R10: dffffc0000000000 R11: fffffbfff20ae8e7 R12: ffff888103aad940
R13: ffff88812103bef8 R14: dffffc0000000000 R15: 1ffff110242077e4
 __schedule+0x17e1/0x56c0
 schedule+0x164/0x2b0
 schedule_timeout+0x152/0x2c0
 kcompactd+0x41a/0x12c0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
task:syz-executor    state:R  running task     stack:28208 pid:18798 tgid:18798 ppid:2104   task_flags:0x400040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 preempt_schedule_irq+0x4d/0xa0
 irqentry_exit+0x14f/0x8f0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:preempt_count_add+0x8/0x190
Code: a0 00 e9 70 ff ff ff e9 d3 fe ff ff 66 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 <53> 49 bf 00 00 00 00 00 fc ff df 48 c7 c0 80 15 78 9a 48 c1 e8 03
RSP: 0018:ffffc900089977f8 EFLAGS: 00000293
RAX: ffffffff84cf9c30 RBX: ffff888113cc2b00 RCX: ffff88818e429dc0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: dffffc0000000000 R08: ffff888107931ca3 R09: 1ffff11020f26394
R10: dffffc0000000000 R11: ffffed1020f26395 R12: dffffc0000000000
R13: ffffc90008997c20 R14: ffffc90008997c48 R15: ffff88810d43cc20
 _raw_spin_lock+0x12/0x40
 lockref_get_not_dead+0x28/0xc0
 try_to_unlazy+0x4ef/0xb50
 lookup_fast+0x1a8/0x5d0
 link_path_walk+0x71f/0x1910
 path_openat+0x236/0x3830
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x115/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f86cb15e90e
RSP: 002b:00007fff3c763948 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000055558739d500 RCX: 00007f86cb15e90e
RDX: 0000000000080001 RSI: 00007f86cb235fb9 RDI: ffffffffffffff9c
RBP: 00007f86cb235fb9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
R13: 00007fff3c763a20 R14: 000000000014bc6c R15: 00007fff3c763f90
 </TASK>
rcu: rcu_preempt kthread starved for 10494 jiffies! g283309 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:27392 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_timeout+0x152/0x2c0
 rcu_gp_fqs_loop+0x30c/0x11f0
 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: 841 Comm: kworker/u10:0 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+0x11e6/0x15f0
Code: c0 75 7a 41 8b 1e 89 de 83 e6 01 31 ff e8 e2 1e 0c 00 83 e3 01 48 bb 00 00 00 00 00 fc ff df 75 07 e8 8e 1a 0c 00 eb 37 f3 90 <41> 0f b6 04 1c 84 c0 75 10 41 f7 06 01 00 00 00 74 1e e8 73 1a 0c
RSP: 0018:ffffc90006387700 EFLAGS: 00000293
RAX: ffffffff81bae81d RBX: dffffc0000000000 RCX: ffff8881ab9e9dc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90006387860 R08: ffffffff90574737 R09: 1ffffffff20ae8e6
R10: dffffc0000000000 R11: fffffbfff20ae8e7 R12: 1ffff110242085fd
R13: ffff88823c63c448 R14: ffff888121042fe8 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8882a8f54000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe7b53ed158 CR3: 000000000e946000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80
 smp_text_poke_batch_finish+0x5fd/0x1110
 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+0xa8e/0x14e0
 worker_thread+0xa47/0xfb0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
