rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 ticks this GP) idle=3504/1/0x4000000000000000 softirq=129012/129012 fqs=0
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P1132/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=102541, q=319 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 1147 Comm: syz.6.3413 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:advance_sched+0x2c3/0xc90
Code: 80 3c 08 00 74 08 48 89 df e8 19 83 88 f8 48 8b 1b 4c 89 f7 48 89 de e8 db 1b 25 f8 49 39 de 0f 84 1f 09 00 00 4c 89 64 24 38 <49> 81 c7 40 01 00 00 48 8b 04 24 4c 8d a0 10 01 00 00 4c 89 f8 48
RSP: 0018:ffffc900001e0c70 EFLAGS: 00000006
RAX: ffffffff899a91b5 RBX: 0000000000000000 RCX: ffff8881321b5640
RDX: 0000000000010000 RSI: 0000000000000000 RDI: 001c813f64000000
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200003c17c R12: ffff888108a8c340
R13: ffff888108a8c000 R14: 001c813f64000000 R15: ffff88803b34cc00
FS:  0000000000000000(0000) GS:ffff8881a3c1b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3c14c3 CR3: 000000000df36000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 __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:its_return_thunk+0x0/0x10
Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc <c3> cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 e9 6b 13 b7 f5 cc
RSP: 0018:ffffc900043ff550 EFLAGS: 00000282
RAX: 0eb5db6afe9c3a00 RBX: ffffffff822e596a RCX: 0eb5db6afe9c3a00
RDX: 0000000000000000 RSI: ffffffff8be33660 RDI: ffffffff8be33620
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff9400024ce59 R12: dffffc0000000000
R13: 0000000000000008 R14: 0000000000000000 R15: ffff88805fffa520
 pfn_valid+0x3b2/0x490
 page_table_check_clear+0x21/0x700
 unmap_page_range+0x3445/0x4370
 unmap_vmas+0x399/0x580
 exit_mmap+0x248/0xb50
 __mmput+0x118/0x420
 exit_mm+0x1da/0x2c0
 do_exit+0x648/0x2300
 do_group_exit+0x21c/0x2d0
 __x64_sys_exit_group+0x3f/0x40
 x64_sys_call+0x21f7/0x2200
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0323b8ebe9
Code: Unable to access opcode bytes at 0x7f0323b8ebbf.
RSP: 002b:00007ffd18966aa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0323b8ebe9
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffd18966b0c R08: 0000001e18966b9f R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 000000000000006f
R13: 00000000000927c0 R14: 00000000000909e2 R15: 00007ffd18966b60
 </TASK>
task:syz.7.3410      state:R  running task     stack:25256 pid:1132  tgid:1131  ppid:13406  task_flags:0x400140 flags:0x00004002
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 preempt_schedule_irq+0xb5/0x150
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:unwind_next_frame+0xc6d/0x2390
Code: 00 00 00 fc ff df 48 8b 44 24 30 80 3c 28 00 4c 8b 7c 24 18 74 08 4c 89 ff e8 5f 48 b0 00 49 89 1f 48 8b 44 24 58 80 3c 28 00 <48> 8b 5c 24 70 4c 8b 6c 24 50 4c 8b 64 24 10 74 08 48 89 df e8 3a
RSP: 0018:ffffc900044ff038 EFLAGS: 00000246
RAX: 1ffff9200089fe28 RBX: ffffffff820114f7 RCX: 1ffff9200089fe01
RDX: ffffffff903e0040 RSI: 0000000000000002 RDI: ffffc900044ffab8
RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
R10: ffffc900044ff158 R11: ffffffff81ac3810 R12: ffffc90004500000
R13: 1ffff9200089fe23 R14: ffffc900044ff108 R15: ffffc900044ff150
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 save_stack+0xf5/0x1f0
 __set_page_owner+0x8d/0x4a0
 post_alloc_hook+0x240/0x2a0
 get_page_from_freelist+0x21e4/0x22c0
 __alloc_frozen_pages_noprof+0x181/0x370
 alloc_pages_mpol+0x232/0x4a0
 folio_alloc_mpol_noprof+0x39/0x70
 shmem_alloc_and_add_folio+0x447/0xf60
 shmem_get_folio_gfp+0x59d/0x1660
 shmem_write_begin+0xf7/0x2b0
 generic_perform_write+0x2c5/0x900
 shmem_file_write_iter+0xf8/0x120
 vfs_write+0x5c9/0xb30
 ksys_write+0x145/0x250
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3b3838d69f
RSP: 002b:00007f3b39131df0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000001000000 RCX: 00007f3b3838d69f
RDX: 0000000001000000 RSI: 00007f3b2e000000 RDI: 0000000000000008
RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000000058db
R10: 0000000000000002 R11: 0000000000000293 R12: 0000000000000008
R13: 00007f3b39131ef0 R14: 00007f3b39131eb0 R15: 00007f3b2e000000
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g102541 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=44027
rcu: rcu_preempt kthread starved for 10502 jiffies! g102541 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27496 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>
