rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P8531/1:b.el
rcu: 	(detected by 0, t=10503 jiffies, g=24553, q=731 ncpus=2)
task:syz.5.658       state:R  running task     stack:25960 pid:8531  tgid:8526  ppid:8200   task_flags:0x400140 flags:0x00004002
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 preempt_schedule_common+0x83/0xd0
 preempt_schedule+0xae/0xc0
 preempt_schedule_thunk+0x16/0x30
 __local_bh_enable_ip+0x13e/0x1c0
 bpf_test_run+0x376/0x7b0
 bpf_prog_test_run_skb+0xb30/0x1560
 bpf_prog_test_run+0x2c7/0x340
 __sys_bpf+0x581/0x870
 __x64_sys_bpf+0x7c/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc5b418eba9
RSP: 002b:00007fc5b5018038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fc5b43d6090 RCX: 00007fc5b418eba9
RDX: 0000000000000050 RSI: 00002000000002c0 RDI: 000000000000000a
RBP: 00007fc5b4211e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc5b43d6128 R14: 00007fc5b43d6090 R15: 00007ffddd3a9d08
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10494 jiffies! g24553 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=14901
rcu: rcu_preempt kthread starved for 10495 jiffies! g24553 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: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:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 8546 Comm: syz.6.663 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:kasan_check_range+0x1d6/0x2c0
Code: 49 8d 5c 24 07 4d 85 e4 49 0f 49 dc 48 83 e3 f8 49 29 dc 74 12 41 80 3b 00 0f 85 b8 00 00 00 49 ff c3 49 ff cc 75 ee 5b 41 5c <41> 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 45 84 ff 75 63 41 f7 c7 00
RSP: 0000:ffffc9000264f6d8 EFLAGS: 00000056
RAX: 00000000ffffff01 RBX: ffff888136627a80 RCX: ffffffff819e14a2
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff888136627a80
RBP: ffffc9000264f7b0 R08: ffff888136627a83 R09: 1ffff11026cc4f50
R10: dffffc0000000000 R11: ffffed1026cc4f51 R12: ffff888136627a90
R13: ffff888136627a88 R14: ffffed1026cc4f51 R15: 1ffff11026cc4f50
FS:  00007fba04cc06c0(0000) GS:ffff8881a3c13000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d322ff8 CR3: 000000010830c000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 do_raw_spin_lock+0x112/0x290
 _raw_spin_lock_irqsave+0xb3/0xf0
 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: 0033:0x7fba03c5ecf9
Code: 48 89 3c 25 c0 fe ff ff eb 20 0f 1f 80 00 00 00 00 45 31 c0 31 c9 ba 80 00 00 00 48 89 de bf ca 00 00 00 31 c0 e8 97 fe 12 00 <8b> 03 85 c0 74 e1 c7 45 08 00 00 00 00 45 84 e4 74 2d 80 3d d3 69
RSP: 002b:00007fba04cc00f0 EFLAGS: 00000217
RAX: 0000000000000000 RBX: 00007fba03fd5fa8 RCX: 00007fba03d8eba9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fba03fd5fa8
RBP: 00007fba03fd5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fba03fd6038 R14: 00007fffd4c09f60 R15: 00007fffd4c0a048
 </TASK>
