rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=22433, q=416 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294965509-4294955007), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g22433 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=8179
rcu: rcu_preempt kthread starved for 10502 jiffies! g22433 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200 ->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:R stack:26856 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: 9168 Comm: syz.1.947 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+0x69/0xb0
Code: e8 4c d0 7c 00 48 c7 c3 98 ff a1 92 49 03 1e 48 89 d8 48 c1 e8 03 42 0f b6 04 38 84 c0 75 34 8b 03 65 ff 0d d9 5d fa 10 74 11 <83> e0 04 c1 e8 02 5b 41 5e 41 5f c3 cc cc cc cc cc e8 e1 54 8d ff
RSP: 0018:ffffc900001e00b8 EFLAGS: 00000002
RAX: 0000000000072f64 RBX: ffff888136632f98 RCX: 1b54c11353e72c00
RDX: 0000000000010100 RSI: ffffffff8be33e60 RDI: ffffffff8be33e20
RBP: ffffc900001e01d8 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200003c018 R12: dffffc0000000000
R13: ffffffff81ada91e R14: ffffffff8dbe2d18 R15: dffffc0000000000
FS:  00007fcc26db76c0(0000) GS:ffff8881a3c13000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002000 CR3: 0000000122b06000 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:lock_acquire+0x175/0x360
Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 7b 5f 03 11 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc900001e0990 EFLAGS: 00000206
RAX: 1b54c11353e72c00 RBX: 0000000000000000 RCX: 1b54c11353e72c00
RDX: 0000000000000000 RSI: ffffffff8dba9863 RDI: ffffffff8be33e80
RBP: ffffffff822bf839 R08: 0000000000000000 R09: ffffffff822bf839
R10: dffffc0000000000 R11: ffffed10036de131 R12: 0000000000000002
R13: ffffffff8e13a120 R14: 0000000000000000 R15: 0000000000000246
 percpu_ref_put+0x35/0x180
 __free_frozen_pages+0x17b/0xd30
 __tlb_remove_table+0x2d2/0x3b0
 tlb_remove_table_rcu+0x85/0x100
 rcu_core+0xcab/0x1770
 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:free_page_is_bad+0x48/0x180
Code: 04 00 00 00 e8 59 e3 0d 00 4c 89 f8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 00 01 00 00 49 be 23 e1 14 00 00 0e 00 00 41 8b 07 <83> f8 ff 0f 85 d0 00 00 00 48 8d 7b 18 48 89 f8 48 c1 e8 03 42 80
RSP: 0018:ffffc90006fdf980 EFLAGS: 00000246
RAX: 00000000ffffffff RBX: ffffea000089d5c0 RCX: ffffffff82156197
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffea000089d5f0
RBP: ffffea000089d408 R08: ffffea000089d5f3 R09: 1ffffd4000113abe
R10: dffffc0000000000 R11: fffff94000113abf R12: dffffc0000000000
R13: 0000000000000000 R14: 00000e000014e123 R15: ffffea000089d5f0
 __free_frozen_pages+0x812/0xd30
 __put_partials+0x156/0x1a0
 put_cpu_partial+0x17c/0x250
 __slab_free+0x2d5/0x3c0
 qlist_free_all+0x97/0x140
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 __kmalloc_cache_noprof+0x1be/0x3d0
 btf_new_fd+0x137/0xc90
 __sys_bpf+0x406/0x870
 __x64_sys_bpf+0x7c/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcc25f8eba9
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:00007fcc26db7038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fcc261d5fa0 RCX: 00007fcc25f8eba9
RDX: 0000000000000028 RSI: 00002000000013c0 RDI: 0000000000000012
RBP: 00007fcc26011e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcc261d6038 R14: 00007fcc261d5fa0 R15: 00007ffcdd9c8798
 </TASK>
