rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=5e6c/1/0x4000000000000000 softirq=81367/81381 fqs=0
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P15846/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=52289, q=360 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 15842 Comm: syz.4.4021 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:__asan_memset+0x15/0x50
Code: 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 41 56 53 48 89 d3 89 f5 49 89 fe 48 8b 4c 24 18 <48> 89 d6 ba 01 00 00 00 e8 7e e4 ff ff 84 c0 74 11 4c 89 f7 89 ee
RSP: 0018:ffffc90000007c88 EFLAGS: 00000046
RAX: 575d87ccb9934700 RBX: 0000000000000010 RCX: ffffffff84d02b06
RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffffc90000007cb0
RBP: 0000000000000000 R08: ffff888119657357 R09: 0000000000000000
R10: ffff888119657340 R11: ffffed10232cae6b R12: ffff888119657340
R13: dffffc0000000000 R14: ffffc90000007cb0 R15: ffff88804b027b80
FS:  00007feb23b606c0(0000) GS:ffff8880b861b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007feb209ff000 CR3: 000000003e5a0000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 debug_object_deactivate+0x36/0x250
 debug_deactivate+0x1d/0x200
 __hrtimer_run_queues+0x2b0/0xc60
 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:check_preemption_disabled+0x6/0x120
Code: c7 c6 60 36 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 be 26 07 48 89 44 24 08 65 8b 05 c6 be
RSP: 0018:ffffc900064cf310 EFLAGS: 00000287
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000002
RDX: 0000000000000000 RSI: ffffffff8be33660 RDI: ffffffff8be33620
RBP: ffffffff822e592a R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed10039666a8 R12: 0000000000000002
R13: ffffffff8e139f60 R14: 0000000000000000 R15: 0000000000000000
 rcu_is_watching+0x15/0xb0
 lock_acquire+0x5f/0x360
 pfn_valid+0xd6/0x490
 page_table_check_clear+0x21/0x700
 unmap_page_range+0x340f/0x4370
 unmap_vmas+0x399/0x580
 vms_clear_ptes+0x35c/0x540
 vms_complete_munmap_vmas+0x206/0x8a0
 do_vmi_align_munmap+0x358/0x420
 do_vmi_munmap+0x253/0x2e0
 __vm_munmap+0x23b/0x3d0
 __x64_sys_munmap+0x60/0x70
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7feb22d8ec77
Code: 00 00 00 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 0b 00 00 00 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:00007feb23b5fe18 EFLAGS: 00000246 ORIG_RAX: 000000000000000b
RAX: ffffffffffffffda RBX: 0000000008000000 RCX: 00007feb22d8ec77
RDX: 0000000000000000 RSI: 0000000008400000 RDI: 00007feb18a00000
RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000002220f
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000003
R13: 00007feb23b5fef0 R14: 00007feb23b5feb0 R15: 00007feb18a00000
 </TASK>
task:syz.5.4022      state:R  running task     stack:25264 pid:15846 tgid:15841 ppid:15280  task_flags:0x400040 flags:0x00004002
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 preempt_schedule_notrace+0xd1/0x110
 preempt_schedule_notrace_thunk+0x16/0x30
 rcu_is_watching+0x7f/0xb0
 lock_release+0x4b/0x3e0
 unwind_next_frame+0x19a9/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 save_stack+0xf5/0x1f0
 __reset_page_owner+0x71/0x1f0
 free_unref_folios+0xdbd/0x1520
 folios_put_refs+0x559/0x640
 shmem_undo_range+0x49e/0x14b0
 shmem_fallocate+0x41f/0xde0
 vfs_fallocate+0x669/0x7e0
 madvise_vma_behavior+0x3254/0x3af0
 madvise_walk_vmas+0x51c/0xa30
 madvise_do_behavior+0x38e/0x550
 do_madvise+0x1bc/0x270
 __x64_sys_madvise+0xa7/0xc0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3ac898ebe9
RSP: 002b:00007f3ac9860038 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007f3ac8bb6090 RCX: 00007f3ac898ebe9
RDX: 0000000000000009 RSI: 0000000000600002 RDI: 0000200000000000
RBP: 00007f3ac8a11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3ac8bb6128 R14: 00007f3ac8bb6090 R15: 00007fff0a014d68
 </TASK>
rcu: rcu_preempt kthread starved for 10502 jiffies! g52289 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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  running task     stack:27432 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:
CPU: 1 UID: 0 PID: 8073 Comm: kworker/u9:5 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
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:smp_call_function_many_cond+0xd33/0x12d0
Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 b6 62 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 61 5e 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 45 5e
RSP: 0018:ffffc90006967660 EFLAGS: 00000293
RAX: ffffffff81b44ceb RBX: 1ffff11009608341 RCX: ffff888039498000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900069677e0 R08: ffffffff8fa38337 R09: 1ffffffff1f47066
R10: dffffc0000000000 R11: fffffbfff1f47067 R12: ffff88804b041a08
R13: dffffc0000000000 R14: ffff88813663b1c0 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881a3c1b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000280 CR3: 000000000df36000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80
 smp_text_poke_batch_finish+0x5f9/0x1130
 arch_jump_label_transform_apply+0x1c/0x30
 static_key_enable_cpuslocked+0x128/0x250
 static_key_enable+0x1a/0x20
 toggle_allocation_gate+0xad/0x240
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30
 </TASK>
