rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=c6e4/1/0x4000000000000000 softirq=90066/90067 fqs=0
rcu: 	(detected by 0, t=10505 jiffies, g=90477, q=394 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 16955 Comm: syz.5.4368 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:__lock_acquire+0x76a/0x2e50
Code: 4d 85 ff 0f 84 88 00 00 00 41 83 ff 31 0f 83 c2 24 00 00 4b 8d 04 bf 4d 8b 66 20 8b 84 c7 a0 0b 00 00 44 31 e0 25 00 60 00 00 <0f> 95 c1 89 4c 24 08 31 c9 f7 d8 48 19 c9 48 09 cb 48 83 bc 24 20
RSP: 0018:ffffc90000a08b18 EFLAGS: 00000006
RAX: 0000000000004000 RBX: 57b0a785f8d27cf1 RCX: ffffffff9423ad50
RDX: 0000000000000008 RSI: ffff88810caae5f8 RDI: ffff88810caada00
RBP: 0000000000000000 R08: 6400000000000000 R09: 0000000000080000
R10: 0000000000000000 R11: ffff8881bb1882c0 R12: 64000000000c5248
R13: 0000000000000000 R14: ffff88810caae5f8 R15: 0000000000000002
FS:  00007f4f07f896c0(0000) GS:ffff8882a8f56000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f33e426eff8 CR3: 0000000112614000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 lock_acquire+0x115/0x350
 _raw_spin_lock+0x2e/0x40
 advance_sched+0xc2/0xc80
 __hrtimer_run_queues+0x3bc/0xa10
 hrtimer_interrupt+0x448/0x910
 __sysvec_apic_timer_interrupt+0x102/0x430
 sysvec_apic_timer_interrupt+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:__folio_batch_add_and_move+0xfb/0xc50
Code: 01 bd ff 83 fd 07 0f 87 93 09 00 00 e8 0e fd bc ff 4e 8d 34 ed d0 67 4f 8e 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 f7 e8 97 b1 2b 00 49 c7 c5 50 d9 6d 93 4d
RSP: 0018:ffffc900047de718 EFLAGS: 00000a02
RAX: 1ffffffff1c9ecfb RBX: dffffc0000000000 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000008
RBP: 0000000000000001 R08: ffffea0006cb7f77 R09: 1ffffd4000d96fee
R10: dffffc0000000000 R11: fffff94000d96fef R12: ffffea0006cb7f40
R13: 0000000000000001 R14: ffffffff8e4f67d8 R15: ffffffff936dd980
 shmem_alloc_and_add_folio+0xcc2/0xf60
 shmem_get_folio_gfp+0x5da/0x16d0
 shmem_write_begin+0x16c/0x330
 generic_perform_write+0x2d5/0x8f0
 shmem_file_write_iter+0xf8/0x120
 __kernel_write_iter+0x44a/0x8f0
 dump_user_range+0xc19/0x12c0
 elf_core_dump+0x3485/0x3a90
 coredump_write+0x1290/0x1960
 vfs_coredump+0x36ff/0x44b0
 get_signal+0x1094/0x12c0
 arch_do_signal_or_restart+0xbb/0x860
 irqentry_exit+0x2ba/0x8f0
 asm_exc_page_fault+0x26/0x30
RIP: 0033:0x7f4f0719e0e1
Code: 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f
RSP: 002b:0000000000000010 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f4f07425fa0 RCX: 00007f4f0719e0d9
RDX: 0000000000000000 RSI: 0000000000000010 RDI: 0000000000000000
RBP: 00007f4f07235024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4f07426038 R14: 00007f4f07425fa0 R15: 00007ffed21dfa48
 </TASK>
rcu: rcu_preempt kthread starved for 10505 jiffies! g90477 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R  running task     stack:27896 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_timeout+0x152/0x2c0
 rcu_gp_fqs_loop+0x30c/0x11f0
 rcu_gp_kthread+0x9e/0x2b0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 1234 Comm: kworker/u9:2 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:smp_call_function_many_cond+0x11e6/0x15f0
Code: c0 75 7a 41 8b 1e 89 de 83 e6 01 31 ff e8 42 21 0c 00 83 e3 01 48 bb 00 00 00 00 00 fc ff df 75 07 e8 ee 1c 0c 00 eb 37 f3 90 <41> 0f b6 04 1c 84 c0 75 10 41 f7 06 01 00 00 00 74 1e e8 d3 1c 0c
RSP: 0000:ffffc900078af700 EFLAGS: 00000293
RAX: ffffffff81bace8d RBX: dffffc0000000000 RCX: ffff888102735a00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900078af860 R08: ffffffff90573337 R09: 1ffffffff20ae666
R10: dffffc0000000000 R11: fffffbfff20ae667 R12: 1ffff110478c81e1
R13: ffff88812103c4c8 R14: ffff88823c640f08 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88818d956000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31a23ffc CR3: 000000000e946000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80
 smp_text_poke_batch_finish+0x5fd/0x1110
 arch_jump_label_transform_apply+0x1c/0x30
 static_key_enable_cpuslocked+0x128/0x240
 static_key_enable+0x1a/0x20
 toggle_allocation_gate+0xab/0x290
 process_scheduled_works+0xa8e/0x14e0
 worker_thread+0xa47/0xfb0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
