rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P1961/1:b..l P4036/1:b..l
	(detected by 0, t=10502 jiffies, g=4697, q=290)
task:syz-executor    state:R  running task     stack:    0 pid: 4036 ppid:  4031 flags:0x00000008
Call trace:
 __switch_to+0x2f4/0x558 arch/arm64/kernel/process.c:521
 context_switch kernel/sched/core.c:5030 [inline]
 __schedule+0xe00/0x1c0c kernel/sched/core.c:6376
 preempt_schedule_notrace+0xc4/0x168 kernel/sched/core.c:6631
 rcu_lockdep_current_cpu_online+0x19c/0x1e0 kernel/rcu/tree.c:1175
 rcu_read_lock_held_common kernel/rcu/update.c:112 [inline]
 rcu_read_lock_held+0x20/0x50 kernel/rcu/update.c:309
 xa_entry include/linux/xarray.h:1182 [inline]
 xas_find+0x4a8/0x8f8 lib/xarray.c:1266
 find_get_entry+0x70/0x254 mm/filemap.c:1978
 find_lock_entries+0x4ec/0x828 mm/filemap.c:2092
 truncate_inode_pages_range+0x160/0x9b8 mm/truncate.c:320
 truncate_inode_pages mm/truncate.c:425 [inline]
 truncate_inode_pages_final+0x90/0xcc mm/truncate.c:464
 nilfs_evict_inode+0xe0/0x440 fs/nilfs2/inode.c:934
 evict+0x3c8/0x810 fs/inode.c:647
 dispose_list fs/inode.c:680 [inline]
 evict_inodes+0x4a4/0x6e4 fs/inode.c:728
 generic_shutdown_super+0x9c/0x2f0 fs/super.c:454
 kill_block_super+0x70/0xdc fs/super.c:1427
 deactivate_locked_super+0xb8/0x13c fs/super.c:335
 deactivate_super+0xf8/0x118 fs/super.c:366
 cleanup_mnt+0x3a4/0x458 fs/namespace.c:1139
 __cleanup_mnt+0x20/0x30 fs/namespace.c:1146
 task_work_run+0x12c/0x1e0 kernel/task_work.c:188
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 do_notify_resume+0x24b4/0x3128 arch/arm64/kernel/signal.c:949
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:133 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:138 [inline]
 el0_svc+0xf0/0x1e0 arch/arm64/kernel/entry-common.c:609
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
task:kworker/1:2     state:R  running task     stack:    0 pid: 1961 ppid:     2 flags:0x00000008
Workqueue: events nsim_fib_event_work
Call trace:
 __switch_to+0x2f4/0x558 arch/arm64/kernel/process.c:521
 context_switch kernel/sched/core.c:5030 [inline]
 __schedule+0xe00/0x1c0c kernel/sched/core.c:6376
 preempt_schedule_irq+0x90/0x214 kernel/sched/core.c:6780
 arm64_preempt_schedule_irq+0x14c/0x21c arch/arm64/kernel/entry-common.c:260
 el1_interrupt+0x40/0x58 arch/arm64/kernel/entry-common.c:463
 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:470
 el1h_64_irq+0x78/0x7c arch/arm64/kernel/entry.S:522
 fib_get_table+0x80/0xf4 net/ipv4/fib_frontend.c:122
 fib_find_matching_alias net/ipv4/fib_trie.c:1019 [inline]
 fib_alias_hw_flags_set+0x108/0x8c0 net/ipv4/fib_trie.c:1047
 nsim_fib4_rt_hw_flags_set drivers/net/netdevsim/fib.c:351 [inline]
 nsim_fib4_rt_add drivers/net/netdevsim/fib.c:368 [inline]
 nsim_fib4_rt_insert drivers/net/netdevsim/fib.c:430 [inline]
 nsim_fib4_event drivers/net/netdevsim/fib.c:462 [inline]
 nsim_fib_event drivers/net/netdevsim/fib.c:882 [inline]
 nsim_fib_event_work+0x12dc/0x2704 drivers/net/netdevsim/fib.c:1483
 process_one_work+0x79c/0x1140 kernel/workqueue.c:2310
 process_scheduled_works kernel/workqueue.c:2373 [inline]
 worker_thread+0xb64/0x101c kernel/workqueue.c:2459
 kthread+0x374/0x454 kernel/kthread.c:334
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:855
rcu: rcu_preempt kthread starved for 10498 jiffies! g4697 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:    0 pid:   15 ppid:     2 flags:0x00000008
Call trace:
 __switch_to+0x2f4/0x558 arch/arm64/kernel/process.c:521
 context_switch kernel/sched/core.c:5030 [inline]
 __schedule+0xe00/0x1c0c kernel/sched/core.c:6376
 schedule+0x11c/0x1c8 kernel/sched/core.c:6459
 schedule_timeout+0x180/0x2c8 kernel/time/timer.c:1914
 rcu_gp_fqs_loop+0x25c/0x11f0 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0xc4/0x2a8 kernel/rcu/tree.c:2145
 kthread+0x374/0x454 kernel/kthread.c:334
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:855
rcu: Stack dump where RCU GP kthread last ran:
Task dump for CPU 1:
task:syz.2.7         state:R  running task     stack:    0 pid: 4160 ppid:  4046 flags:0x00000000
Call trace:
 __switch_to+0x2f4/0x558 arch/arm64/kernel/process.c:521
 0xffff0000cd5bdc10