rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=125873, q=312 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4295018678-4295008176), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g125873 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=46353
rcu: rcu_preempt kthread starved for 10502 jiffies! g125873 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: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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 32179 Comm: syz.0.10603 Not tainted 6.16.0-syzkaller-11895-gcca7a0aae895-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:__lock_acquire+0x899/0xd20
Code: 00 0f 85 36 02 00 00 48 83 7c 24 28 00 0f 84 bc 01 00 00 41 8b 46 f8 25 ff 1f 00 00 48 0f a3 05 4d 1c 0a 12 0f 83 5a 01 00 00 <48> 69 c0 c8 00 00 00 48 8d 80 10 83 48 93 e9 87 01 00 00 e8 af 82
RSP: 0018:ffffc900001e0b30 EFLAGS: 00000003
RAX: 0000000000000037 RBX: 0000000000000003 RCX: 0000000010d8d7c3
RDX: 0000000004b019fd RSI: 000000002822561a RDI: ffff888120115640
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8999b5d4
R10: dffffc0000000000 R11: ffffffff8999b510 R12: 0000000000001298
R13: ffff888120116130 R14: ffff8881201161a8 R15: 66d8ae8410d8d7c3
FS:  0000000000000000(0000) GS:ffff8881a3c24000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33a23ffc CR3: 000000000df36000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 lock_acquire+0x120/0x360
 _raw_spin_lock+0x2e/0x40
 advance_sched+0xc4/0xc90
 __hrtimer_run_queues+0x52c/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:unmap_page_range+0x1ed5/0x4370
Code: e8 f0 c6 19 00 48 8b bc 24 b8 00 00 00 4c 89 3f 48 8b 4c 24 68 48 89 cb 48 c1 eb 03 48 b8 00 00 00 00 00 fc ff df 80 3c 03 00 <74> 0f 48 8b 7c 24 68 e8 cf c5 19 00 48 8b 4c 24 68 48 8b 01 48 8b
RSP: 0018:ffffc900202973a0 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: 1ffff92004052f0f RCX: ffffc90020297878
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc90020297870
RBP: ffffc90020297650 R08: ffffea000479f207 R09: 1ffffd40008f3e40
R10: dffffc0000000000 R11: fffff940008f3e41 R12: dffffc0000000000
R13: 00007f7f546c7000 R14: 800000011e7c8000 R15: 00007f7f53800000
 unmap_vmas+0x399/0x580
 exit_mmap+0x248/0xb50
 __mmput+0x118/0x430
 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: 0033:0x7f7f54d8ebe9
Code: Unable to access opcode bytes at 0x7f7f54d8ebbf.
RSP: 002b:00007f7f52ff60e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007f7f54fb5fa8 RCX: 00007f7f54d8ebe9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f7f54fb5fac
RBP: 00007f7f54fb5fa0 R08: 7fffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7f54fb6038 R14: 00007ffd5b3ce7f0 R15: 00007ffd5b3ce8d8
 </TASK>
