rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 ticks this GP) idle=f324/1/0x4000000000000000 softirq=13819/13819 fqs=0
rcu: 	(detected by 1, t=10502 jiffies, g=7969, q=157 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6042 Comm: syz.0.40 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:do_raw_spin_unlock+0x11/0x240
Code: 85 00 e9 60 ff ff ff 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 55 41 57 41 56 41 55 41 54 53 48 89 fb <49> bc 00 00 00 00 00 fc ff df 4c 8d 77 04 4c 89 f0 48 c1 e8 03 42
RSP: 0018:ffffc90000006b48 EFLAGS: 00000086
RAX: 93e69a0291266900 RBX: ffff88804b027a80 RCX: 93e69a0291266900
RDX: 0000000000000004 RSI: ffffffff8dba9832 RDI: ffff88804b027a80
RBP: ffffc90000006c18 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000000d60 R12: dffffc0000000000
R13: ffff88804b027b00 R14: ffff88804b027a80 R15: 1ffff92000000d70
FS:  00007f21ba9e96c0(0000) GS:ffff8880b8613000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000114c44000 CR4: 00000000000006f0
DR0: ffffffffffffffff DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 _raw_spin_unlock_irqrestore+0x78/0x110
 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+0x52/0xc0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_release+0x44/0x3e0
Code: 8b 05 a0 4f 03 11 48 89 44 24 28 0f 1f 44 00 00 65 8b 05 a3 4f 03 11 83 f8 08 0f 83 9a 02 00 00 89 c0 48 0f a3 05 8c 28 06 0e <73> 16 e8 45 f1 08 00 84 c0 75 0d f6 05 7b 0c f0 0d 01 0f 84 ad 02
RSP: 0018:ffffc900000073b0 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffffffff9041a101 RCX: 93e69a0291266900
RDX: ffffc90000007501 RSI: ffffffff8172d195 RDI: ffffffff8e13a120
RBP: dffffc0000000000 R08: ffffc9000404f308 R09: 0000000000000000
R10: ffffc90000007538 R11: fffff52000000ea9 R12: ffffc9000404f318
R13: ffffffff8172d195 R14: ffffffff8e13a120 R15: ffffffff8172d195
 unwind_next_frame+0x19a9/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_node_noprof+0x1bb/0x3c0
 __alloc_skb+0x112/0x2d0
 __netdev_alloc_skb+0x108/0x970
 __ieee80211_beacon_get+0xc06/0x1880
 ieee80211_beacon_get_tim+0xb4/0x2b0
 mac80211_hwsim_beacon_tx+0x3ce/0x860
 __iterate_interfaces+0x2ab/0x590
 ieee80211_iterate_active_interfaces_atomic+0xdb/0x180
 mac80211_hwsim_beacon+0xbb/0x1c0
 __hrtimer_run_queues+0x52c/0xc60
 hrtimer_run_softirq+0x187/0x2b0
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:rcu_is_watching+0x6/0xb0
Code: e8 1f 54 59 03 eb cc 66 66 66 66 2e 0f 1f 84 00 00 00 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 65 ff 05 30 5e fa 10 e8 1b ff d3 09 89 c3 83 f8 08 73 65
RSP: 0018:ffffc9000404f268 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffff88801f5d5640
RDX: ffffc900034d9000 RSI: 0000000000001fdd RDI: 0000000000001fde
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff822e654a
R10: dffffc0000000000 R11: ffffed100472487c R12: 000000000003a179
R13: dffffc0000000000 R14: ffff88805fffa4f0 R15: 0000000000001000
 rcu_read_lock_held+0x15/0x50
 page_ext_lookup+0xe7/0x180
 __page_table_check_zero+0x18f/0x530
 __free_frozen_pages+0xbd7/0xd30
 vfree+0x25a/0x400
 bpf_prog_calc_tag+0x3b8/0x440
 resolve_pseudo_ldimm64+0xbc/0xc50
 bpf_check+0x1c58/0x1d2c0
 bpf_prog_load+0x1318/0x1930
 __sys_bpf+0x528/0x870
 __x64_sys_bpf+0x7c/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f21b9b8eba9
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:00007f21ba9e9038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f21b9dd5fa0 RCX: 00007f21b9b8eba9
RDX: 0000000000000094 RSI: 0000200000000340 RDI: 0000000000000005
RBP: 00007f21b9c11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f21b9dd6038 R14: 00007f21b9dd5fa0 R15: 00007ffe0e1763e8
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g7969 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=3355
rcu: rcu_preempt kthread starved for 10502 jiffies! g7969 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
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:27656 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>
