rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P4267/1:b..l
	(detected by 0, t=10502 jiffies, g=34329, q=330 ncpus=2)
task:syz-executor    state:R  running task     stack:21744 pid:4267  ppid:4263   flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0x11d1/0x40e0 kernel/sched/core.c:6562
 preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6874
 irqentry_exit+0x63/0x70 kernel/entry/common.c:439
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:lockdep_enabled kernel/locking/lockdep.c:116 [inline]
RIP: 0010:lock_is_held_type+0x28/0x190 kernel/locking/lockdep.c:5698
Code: 00 00 55 41 57 41 56 41 55 41 54 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 24 08 bd ff ff ff ff 83 3d ac a0 f3 03 00 <0f> 84 03 01 00 00 65 8b 05 7b 22 d6 75 85 c0 0f 85 f4 00 00 00 65
RSP: 0018:ffffc90003e17760 EFLAGS: 00000202
RAX: 60546284ea9d8d00 RBX: ffffea0002114840 RCX: 60546284ea9d8d00
RDX: ffff888030881dc0 RSI: 00000000ffffffff RDI: ffffffff8cb2d620
RBP: 00000000ffffffff R08: ffffea0002114877 R09: 1ffffd400042290e
R10: dffffc0000000000 R11: fffff9400042290f R12: ffff88805480c8f8
R13: 1ffff920007c2f0c R14: ffff8880682d0dc0 R15: ffffc90003e17860
 xa_entry include/linux/xarray.h:1198 [inline]
 xas_reload+0x19c/0x470 include/linux/xarray.h:1583
 find_get_entry mm/filemap.c:2048 [inline]
 find_lock_entries+0x35e/0xbb0 mm/filemap.c:2123
 shmem_undo_range+0x288/0x20c0 mm/shmem.c:925
 shmem_truncate_range mm/shmem.c:1062 [inline]
 shmem_evict_inode+0x25b/0xa80 mm/shmem.c:1171
 evict+0x4c9/0x8d0 fs/inode.c:705
 do_unlinkat+0x388/0x580 fs/namei.c:4405
 __do_sys_unlink fs/namei.c:4446 [inline]
 __se_sys_unlink fs/namei.c:4444 [inline]
 __x64_sys_unlink+0x45/0x50 fs/namei.c:4444
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f2e1b199fa7
RSP: 002b:00007fff72570438 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2e1b199fa7
RDX: 00007fff72570460 RSI: 00007fff725704f0 RDI: 00007fff725704f0
RBP: 00007fff725704f0 R08: 00007fff725714f0 R09: 00000000ffffffff
R10: 0000000000000100 R11: 0000000000000206 R12: 00007fff72571580
R13: 00007f2e1b20471f R14: 000000000006b54c R15: 00007fff725715c0
 </TASK>
rcu: rcu_preempt kthread starved for 10533 jiffies! g34329 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:27736 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0x11d1/0x40e0 kernel/sched/core.c:6562
 schedule+0xb9/0x180 kernel/sched/core.c:6638
 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x303/0x1340 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0x99/0x3b0 kernel/rcu/tree.c:1905
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
NMI backtrace for cpu 1 skipped: idling at default_idle+0xb/0x10 arch/x86/kernel/process.c:741