rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=d08c/1/0x4000000000000000 softirq=48771/48771 fqs=0
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P11192/1:b..l
rcu: 	(detected by 1, t=10506 jiffies, g=37689, q=606 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 11208 Comm: syz.8.1390 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:hrtimer_try_to_cancel+0x1e6/0x420
Code: 80 e1 07 80 c1 03 38 c1 7c ea 48 89 df e8 92 97 75 00 eb e0 e8 cb 19 12 00 e9 ce fe ff ff e8 c1 19 12 00 eb 05 e8 ba 19 12 00 <4c> 8b 64 24 08 48 8b 44 24 10 42 80 3c 30 00 74 08 4c 89 e7 e8 91
RSP: 0000:ffffc90003d4f868 EFLAGS: 00000006
RAX: ffffffff81ada746 RBX: ffff88804b027b10 RCX: ffff8880372c8000
RDX: 0000000000010000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 000000000045f326 R08: ffff88804b027a83 R09: 1ffff11009604f50
R10: dffffc0000000000 R11: ffffed1009604f51 R12: 1ffff11009604f62
R13: ffff88804b027b48 R14: dffffc0000000000 R15: ffff88804b027b00
FS:  00007f0d87c086c0(0000) GS:ffff8880b8613000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e91aff8 CR3: 0000000047abc000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 hrtimer_cancel+0x3b/0x50
 cpu_clock_event_stop+0xd9/0x130
 __perf_event_overflow+0x580/0xe40
 perf_swevent_hrtimer+0x3c5/0x550
 __hrtimer_run_queues+0x4e0/0xc60
 hrtimer_interrupt+0x45b/0xaa0
 __sysvec_apic_timer_interrupt+0x10b/0x410
 sysvec_apic_timer_interrupt+0x52/0xc0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0033:0x7f0d86c5e806
Code: 53 48 83 ec 68 48 63 47 28 48 89 3c 24 48 8d 74 24 20 bf 01 00 00 00 89 44 24 10 48 c1 e0 07 48 01 d0 48 89 44 24 18 48 8b 18 <e8> 05 5b 12 00 85 c0 0f 85 5a 04 00 00 48 ba db 34 b6 d7 82 de 1b
RSP: 002b:00007f0d87c08060 EFLAGS: 00000206
RAX: 00007f0d86ea0560 RBX: 00007f0d86e145fd RCX: 00007f0d86d8eba9
RDX: 00007f0d86e9ade0 RSI: 00007f0d87c08080 RDI: 0000000000000001
RBP: 00007f0d86fd5fa0 R08: 7fffffffffffffff R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0d86fd6038 R14: 00007fff62142c90 R15: 00007fff62142d78
 </TASK>
task:syz.9.1385      state:R  running task     stack:21576 pid:11192 tgid:11192 ppid:11187  task_flags:0x400640 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: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 0b 4d 03 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:ffffc9000427df50 EFLAGS: 00000206
RAX: 644064f200691300 RBX: 0000000000000202 RCX: 644064f200691300
RDX: 0000000000000002 RSI: ffffffff8dba9832 RDI: ffffffff8be33e00
RBP: ffff888036d2c4c0 R08: ffffc9000427e7f0 R09: 0000000000000000
R10: ffffc9000427e0d8 R11: fffff5200084fc1d R12: 0000000000000002
R13: 0000000000000002 R14: ffffffff8e13a120 R15: ffff888036d2b980
 unwind_next_frame+0x19a9/0x2390
 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
 __kernel_write_iter+0x428/0x910
 dump_user_range+0x8a0/0xc90
 elf_core_dump+0x337b/0x3990
 coredump_write+0x1169/0x1900
 vfs_coredump+0x1daa/0x2a50
 get_signal+0x1109/0x1340
 arch_do_signal_or_restart+0x9a/0x750
 irqentry_exit_to_user_mode+0x81/0x120
 exc_general_protection+0x171/0x200
 asm_exc_general_protection+0x26/0x30
RIP: 0033:0x7f648f58ebb1
RSP: 002b:0000200000000280 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f648f7d5fa0 RCX: 00007f648f58eba9
RDX: 0000200000000040 RSI: 0000200000000280 RDI: 0000000000084000
RBP: 00007f648f611e19 R08: 00002000000002c0 R09: 00002000000002c0
R10: 00002000000000c0 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f648f7d6038 R14: 00007f648f7d5fa0 R15: 00007fffefdc43b8
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10505 jiffies! g37689 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=16540
rcu: rcu_preempt kthread starved for 10506 jiffies! g37689 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:26856 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+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
