rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 ticks this GP) idle=b93c/1/0x4000000000000000 softirq=53633/53633 fqs=0
rcu: 	(detected by 0, t=10506 jiffies, g=47873, q=256 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 13698 Comm: syz.6.2132 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:rcu_is_watching+0x3a/0xb0
Code: e8 1b ff d3 09 89 c3 83 f8 08 73 65 49 bf 00 00 00 00 00 fc ff df 4c 8d 34 dd 10 2d be 8d 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 <74> 08 4c 89 f7 e8 1c d0 7c 00 48 c7 c3 98 ff a1 92 49 03 1e 48 89
RSP: 0018:ffffc900001e03b8 EFLAGS: 00000046
RAX: 1ffffffff1b7c5a3 RBX: 0000000000000001 RCX: 3852bc4e8a5c7e00
RDX: 0000000000010100 RSI: ffffffff8be33e60 RDI: ffffffff8be33e20
RBP: ffffc900001e04d8 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200003c078 R12: dffffc0000000000
R13: ffffffff81ada91e R14: ffffffff8dbe2d18 R15: dffffc0000000000
FS:  00007f6ca68e76c0(0000) GS:ffff8881a3c13000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000036d04000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 lock_release+0x4b/0x3e0
 _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+0x52/0xc0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:__run_timer_base+0xc8/0x860
Code: 8d e8 5c 11 76 00 48 8b 1d 05 e1 33 0c 48 8b 44 24 18 4c 8d 70 50 4c 89 f0 48 c1 e8 03 48 89 84 24 80 00 00 00 42 80 3c 20 00 <74> 08 4c 89 f7 e8 2e 11 76 00 4c 89 b4 24 88 00 00 00 4d 8b 36 48
RSP: 0018:ffffc900001e0ca0 EFLAGS: 00000246
RAX: 1ffff11026cc4d42 RBX: 00000001000024e1 RCX: ffff888109c88000
RDX: 0000000000000100 RSI: 0000000000000001 RDI: ffff8881366269c0
RBP: ffffc900001e0e10 R08: ffffffff8fa3a937 R09: 1ffffffff1f47526
R10: dffffc0000000000 R11: fffffbfff1f47527 R12: dffffc0000000000
R13: 0000000000000002 R14: ffff888136626a10 R15: ffffffff8de0c0c8
 run_timer_softirq+0x103/0x180
 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:alloc_pages_mpol+0x235/0x4a0
Code: af 9f ff 44 8b 64 24 04 eb 05 e8 f6 ae 9f ff 44 8b 6c 24 14 44 89 ff 44 89 e6 44 89 ea 48 8b 4c 24 08 e8 be 0e f6 ff 48 89 c3 <48> b9 00 00 00 00 00 fc ff df 0f b6 44 0d 00 48 89 cd 84 c0 0f 85
RSP: 0018:ffffc90006af75f8 EFLAGS: 00000246
RAX: ffffea00043eaf80 RBX: ffffea00043eaf80 RCX: 3852bc4e8a5c7e00
RDX: 0000000000000000 RSI: ffffffff8be33e60 RDI: ffffffff8be33e20
RBP: 1ffffffff3363ea8 R08: ffffffff8fa3a937 R09: 1ffffffff1f47526
R10: dffffc0000000000 R11: fffffbfff1f47527 R12: 0000000000000000
R13: 0000000000000001 R14: ffffffff99b1f544 R15: 0000000000000dc0
 alloc_pages_noprof+0xa9/0x190
 get_free_pages_noprof+0xf/0x80
 kasan_populate_vmalloc+0x38/0x270
 alloc_vmap_area+0xd62/0x14a0
 __get_vm_area_node+0x1f8/0x300
 __vmalloc_node_range_noprof+0x301/0x12f0
 __vmalloc_noprof+0xb1/0xf0
 bpf_prog_alloc_no_stats+0x4a/0x4d0
 bpf_prog_alloc+0x3c/0x1a0
 bpf_prog_load+0x735/0x1930
 __sys_bpf+0x528/0x870
 __x64_sys_bpf+0x7c/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6ca598eba9
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:00007f6ca68e7038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f6ca5bd5fa0 RCX: 00007f6ca598eba9
RDX: 0000000000000094 RSI: 0000200000000200 RDI: 0000000000000005
RBP: 00007f6ca5a11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6ca5bd6038 R14: 00007f6ca5bd5fa0 R15: 00007ffe4bfee618
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10505 jiffies! g47873 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=27029
rcu: rcu_preempt kthread starved for 10506 jiffies! g47873 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>
