rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=a204/1/0x4000000000000000 softirq=18215/18216 fqs=42
rcu: 	(detected by 1, t=10506 jiffies, g=12049, q=627 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6668 Comm: syz.1.206 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:__lock_acquire+0x332/0xd20
Code: e5 15 09 d5 09 cd 44 09 f5 41 89 6c c7 20 45 89 44 c7 24 4c 89 7c 24 10 4d 8d 34 c7 81 e5 ff 1f 00 00 48 0f a3 2d 3e 1f 0b 12 <73> 10 48 69 c5 c8 00 00 00 48 8d 80 10 93 49 93 eb 40 83 3d a5 ae
RSP: 0000:ffffc900085e7370 EFLAGS: 00000003
RAX: 0000000000000000 RBX: ffffffff8e13a0e0 RCX: 0000000000000007
RDX: 0000000000080000 RSI: 0000000000004000 RDI: ffff888022833980
RBP: 0000000000000007 R08: 0000000000000000 R09: ffffffff81cb1657
R10: 61625f72656d6974 R11: 6b636f6c2e736573 R12: 0000000000024000
R13: 0000000000000000 R14: ffff888022834470 R15: ffff888022834470
FS:  00007fbd0be986c0(0000) GS:ffff8880b8613000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32763fff CR3: 00000000321ba000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 lock_acquire+0x120/0x360
 trace_call_bpf+0xd4/0x850
 perf_trace_run_bpf_submit+0x78/0x170
 perf_trace_lock_acquire+0x335/0x410
 lock_acquire+0x311/0x360
 _raw_spin_lock_irqsave+0xa7/0xf0
 hrtimer_try_to_cancel+0x22b/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: 0033:0x7fbd0be9fa90
Code: 89 e5 48 8d 05 91 95 ff ff 31 c9 81 3d 89 95 ff ff ff ff ff 7f 0f 94 c1 c1 e1 0c 48 8b 44 01 28 48 85 ff 74 03 48 89 07 5d c3 <f3> 0f 1e fa 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 48 83
RSP: 002b:00007fbd0be98048 EFLAGS: 00000206
RAX: 00007fbd0be9fa90 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 00007fbd0b09ade0 RSI: 00007fbd0be980b0 RDI: 0000000000000001
RBP: 00007fbd0b01ab78 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbd0b1d6038 R14: 00007fbd0b1d5fa0 R15: 00007fff107c9e78
 </TASK>
rcu: rcu_preempt kthread starved for 10295 jiffies! g12049 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: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: 1 UID: 0 PID: 6645 Comm: syz.1.198 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:smp_call_function_many_cond+0xd33/0x12d0
Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 56 63 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 01 5f 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 e5 5e
RSP: 0018:ffffc90007e37380 EFLAGS: 00000293
RAX: ffffffff81b4601b RBX: 1ffff11009608349 RCX: ffff888109e25640
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90007e37500 R08: ffffffff8fa38f37 R09: 1ffffffff1f471e6
R10: dffffc0000000000 R11: fffffbfff1f471e7 R12: ffff88804b041a48
R13: dffffc0000000000 R14: ffff88813663b1c0 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881a3c13000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055555cab15c8 CR3: 000000000df36000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80
 flush_tlb_mm_range+0x6b1/0x12d0
 tlb_flush_mmu+0x1a7/0x680
 tlb_finish_mmu+0xc3/0x1d0
 free_ldt_pgtables+0x17b/0x320
 exit_mmap+0x17c/0xb50
 __mmput+0x118/0x430
 exit_mm+0x1da/0x2c0
 do_exit+0x648/0x2300
 do_group_exit+0x21c/0x2d0
 get_signal+0x1286/0x1340
 arch_do_signal_or_restart+0x9a/0x750
 irqentry_exit_to_user_mode+0x81/0x120
 exc_page_fault+0x9f/0xf0
 asm_exc_page_fault+0x26/0x30
RIP: 0033:0x70f9b9b408
Code: Unable to access opcode bytes at 0x70f9b9b3de.
RSP: 002b:00002000000002c8 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007fbd0b1d5fa0 RCX: 00007fbd0af8eba9
RDX: 0000200000000100 RSI: 00002000000002c0 RDI: 0000000000000400
RBP: 00007fbd0b011e19 R08: 0000200000000340 R09: 0000200000000340
R10: 0000200000000300 R11: 0000000000000206 R12: 0000000000000000
R13: 00007fbd0b1d6038 R14: 00007fbd0b1d5fa0 R15: 00007fff107c9e78
 </TASK>
