rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P15987/1:b.el
	(detected by 0, t=10502 jiffies, g=71725, q=719 ncpus=2)
task:syz.2.3493      state:R  running task     stack:23408 pid:15987 ppid:14514  flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5246 [inline]
 __schedule+0x107f/0x4030 kernel/sched/core.c:6563
 preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6875
 irqentry_exit+0x63/0x70 kernel/entry/common.c:442
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:constant_test_bit arch/x86/include/asm/bitops.h:207 [inline]
RIP: 0010:arch_test_bit arch/x86/include/asm/bitops.h:239 [inline]
RIP: 0010:_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:142 [inline]
RIP: 0010:test_ti_thread_flag include/linux/thread_info.h:118 [inline]
RIP: 0010:need_resched include/linux/sched.h:2245 [inline]
RIP: 0010:bpf_test_timer_continue+0x107/0x380 net/bpf/test_run.c:77
Code: f9 49 8b 2c 24 48 89 ee 48 83 e6 04 31 ff e8 60 e9 10 f9 48 83 e5 04 0f 85 f4 00 00 00 4c 89 e7 be 08 00 00 00 e8 e9 42 62 f9 <48> b8 00 00 00 00 00 fc ff df 41 80 7c 05 00 00 74 08 4c 89 e7 e8
RSP: 0018:ffffc900039d7a58 EFLAGS: 00000256
RAX: ffffffff88716101 RBX: 1ffff9200073af69 RCX: ffffffff88716117
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88802d3f0000
RBP: 0000000000000000 R08: ffff88802d3f0007 R09: 1ffff11005a7e000
R10: dffffc0000000000 R11: ffffed1005a7e001 R12: ffff88802d3f0000
R13: 1ffff11005a7e000 R14: ffffc900039d7b48 R15: ffffc900039d7b4c
 bpf_test_run+0x3ba/0x830 net/bpf/test_run.c:403
 bpf_prog_test_run_skb+0xdaf/0x18e0 net/bpf/test_run.c:1222
 bpf_prog_test_run+0x31c/0x390 kernel/bpf/syscall.c:3695
 __sys_bpf+0x62b/0x780 kernel/bpf/syscall.c:5053
 __do_sys_bpf kernel/bpf/syscall.c:5139 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5137 [inline]
 __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5137
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f7818f9e559
RSP: 002b:00007f7819f15028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f7819225fa0 RCX: 00007f7818f9e559
RDX: 0000000000000050 RSI: 00002000000020c0 RDI: 000000000000000a
RBP: 00007f7819035ad8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7819226038 R14: 00007f7819225fa0 R15: 00007fff0f893978
 </TASK>