rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (0 ticks this GP) idle=0e8c/1/0x4000000000000000 softirq=44905/44905 fqs=0
rcu: 	(detected by 0, t=10505 jiffies, g=38557, q=535 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 11816 Comm: syz.4.1688 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_release+0x2ad/0x3e0
Code: 49 8d 03 11 83 f8 01 75 51 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 75 56 f7 c3 00 02 00 00 74 01 fb <65> 48 8b 05 0b 4d 03 11 48 3b 44 24 28 0f 85 8b 00 00 00 48 83 c4
RSP: 0018:ffffc900001e0818 EFLAGS: 00000046
RAX: 0000000000000001 RBX: 0000000000000087 RCX: a62ff85c55249300
RDX: 0000000000000000 RSI: ffffffff8dba9832 RDI: ffffffff8be33e00
RBP: ffff888109766130 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200003c100 R12: 0000000000000000
R13: 0000000000000000 R14: ffff888136627a98 R15: ffff888109765640
FS:  00007ff48a4fc6c0(0000) GS:ffff8881a3c13000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f81eff8 CR3: 000000010ea34000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 _raw_spin_unlock_irqrestore+0x70/0x110
 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+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:__sanitizer_cov_trace_pc+0x46/0x70
Code: 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 16 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2
RSP: 0018:ffffc9000446f878 EFLAGS: 00000246
RAX: ffffffff8b769822 RBX: 00000000fffffffd RCX: ffff888109765640
RDX: ffffc90020f09000 RSI: 00000000000000f1 RDI: 00000000000000f1
RBP: ffffc9000446f988 R08: ffffc9000446f917 R09: 0000000000000000
R10: ffffc9000446f900 R11: fffff5200088df23 R12: 0000000000000000
R13: 0000000000000001 R14: ffff88811941423d R15: 00000000ffff1020
 number+0x462/0xf60
 vsnprintf+0x91b/0xf00
 vscnprintf+0x41/0x90
 bpf_verifier_vlog+0x42/0x900
 __btf_verifier_log+0xd4/0x120
 btf_parse_hdr+0x2d8/0x6d0
 btf_new_fd+0x36d/0xc90
 __sys_bpf+0x406/0x870
 __x64_sys_bpf+0x7c/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff48958eba9
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:00007ff48a4fc038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007ff4897d5fa0 RCX: 00007ff48958eba9
RDX: 0000000000000028 RSI: 0000200000000140 RDI: 0000000000000012
RBP: 00007ff489611e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff4897d6038 R14: 00007ff4897d5fa0 R15: 00007fff28a38818
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10504 jiffies! g38557 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=17256
rcu: rcu_preempt kthread starved for 10505 jiffies! g38557 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:26664 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>
