rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P22018/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=103889, q=2856 ncpus=2)
task:syz.9.6294      state:R  running task     stack:25896 pid:22018 tgid:22017 ppid:17482  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: 0033:0x7fbf5df8ebe9
RSP: 002b:00007fbf5ed68038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fbf5e1b5fa0 RCX: 00007fbf5df8ebe9
RDX: 0000000000000050 RSI: 00002000000002c0 RDI: 000000000000000a
RBP: 00007fbf5e011e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbf5e1b6038 R14: 00007fbf5e1b5fa0 R15: 00007ffc8fe6c148
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10492 jiffies! g103889 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=46721
rcu: rcu_preempt kthread starved for 10493 jiffies! g103889 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: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+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 22027 Comm: syz.0.6298 Not tainted 6.17.0-rc1-syzkaller-00036-gdfc0f6373094-dirty #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:check_preemption_disabled+0x3/0x120
Code: e3 8b 48 c7 c6 e0 33 e3 8b eb 1c 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 55 41 57 <41> 56 53 48 83 ec 10 65 48 8b 05 be de 26 07 48 89 44 24 08 65 8b
RSP: 0018:ffffc90000007c00 EFLAGS: 00000003
RAX: 0000000000000000 RBX: 0000000000000806 RCX: 0000000000000003
RDX: 0000000000010000 RSI: ffffffff8be333e0 RDI: ffffffff8be333a0
RBP: ffffc90000007d30 R08: ffffffff8fa37e37 R09: 1ffffffff1f46fc6
R10: dffffc0000000000 R11: fffffbfff1f46fc7 R12: dffffc0000000000
R13: ffffffff81adb198 R14: ffff88804b027a98 R15: 1ffff92000000f94
FS:  0000000000000000(0000) GS:ffff8880b861c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c328246 CR3: 000000000df36000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 rcu_is_watching+0x15/0xb0
 lock_release+0x4b/0x3e0
 _raw_spin_unlock_irqrestore+0x70/0x110
 __hrtimer_run_queues+0x408/0xc60
 hrtimer_interrupt+0x45b/0xaa0
 __sysvec_apic_timer_interrupt+0x10b/0x410
 sysvec_apic_timer_interrupt+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_release+0x2b5/0x3e0
Code: 51 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 75 56 f7 c3 00 02 00 00 74 01 fb 65 48 8b 05 7b d1 02 11 <48> 3b 44 24 28 0f 85 8b 00 00 00 48 83 c4 30 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc900083372b0 EFLAGS: 00000206
RAX: 65d91d4a141c9200 RBX: 0000000000000202 RCX: 65d91d4a141c9200
RDX: 0000000000000003 RSI: ffffffff8dba6026 RDI: ffffffff8be33400
RBP: ffff888107d10b68 R08: 0000000000000000 R09: ffffffff822e63ca
R10: dffffc0000000000 R11: fffff940008b2319 R12: 0000000000000003
R13: 0000000000000003 R14: ffffffff8e139fa0 R15: ffff888107d10000
 pfn_valid+0x3b2/0x490
 page_table_check_clear+0x21/0x700
 unmap_page_range+0x347c/0x43a0
 unmap_vmas+0x399/0x580
 exit_mmap+0x248/0xb50
 __mmput+0x118/0x420
 exit_mm+0x1da/0x2c0
 do_exit+0x648/0x2300
 do_group_exit+0x21c/0x2d0
 get_signal+0x1286/0x1340
 arch_do_signal_or_restart+0x9a/0x750
 exit_to_user_mode_loop+0x75/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f948978ebe9
Code: Unable to access opcode bytes at 0x7f948978ebbf.
RSP: 002b:00007f948a6980e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f94899b5fa8 RCX: 00007f948978ebe9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f94899b5fa8
RBP: 00007f94899b5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f94899b6038 R14: 00007ffcc3756ae0 R15: 00007ffcc3756bc8
 </TASK>
