=============================
WARNING: suspicious RCU usage
syzkaller #0 Tainted: G S           L     
-----------------------------
./include/linux/radix-tree.h:179 suspicious rcu_dereference_check() usage!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
locks held by kworker/u9:0/18098: 4, last CPU#0:
 #0: ffff888032214940 ((wq_completion)f2fs_evict_wq){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffff888032214940 ((wq_completion)f2fs_evict_wq){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffff888032214940 ((wq_completion)f2fs_evict_wq){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3352 [inline]
 #0: ffff888032214940 ((wq_completion)f2fs_evict_wq){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3470
 #1: ffffc90009887c40 ((work_completion)(&ew->work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #1: ffffc90009887c40 ((work_completion)(&ew->work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #1: ffffc90009887c40 ((work_completion)(&ew->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3352 [inline]
 #1: ffffc90009887c40 ((work_completion)(&ew->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3470
 #2: ffff8880b863a820 (lock){+.+.}-{3:3}, at: local_lock_acquire include/linux/local_lock_internal.h:46 [inline]
 #2: ffff8880b863a820 (lock){+.+.}-{3:3}, at: __radix_tree_preload+0x82/0x870 lib/radix-tree.c:334
 #3: ffff8880361708c8 (&im->ino_lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:347 [inline]
 #3: ffff8880361708c8 (&im->ino_lock){+.+.}-{3:3}, at: __set_ino_bitmap fs/f2fs/checkpoint.c:781 [inline]
 #3: ffff8880361708c8 (&im->ino_lock){+.+.}-{3:3}, at: __f2fs_add_ino_entry+0x14c/0x830 fs/f2fs/checkpoint.c:842

stack backtrace:
CPU: 0 UID: 0 PID: 18098 Comm: kworker/u9:0 Tainted: G S           L      syzkaller #0 PREEMPT(full) 
Tainted: [S]=CPU_OUT_OF_SPEC, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: f2fs_evict_wq f2fs_evict_inode_work
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 lockdep_rcu_suspicious+0x140/0x1d0 kernel/locking/lockdep.c:6938
 radix_tree_deref_slot include/linux/radix-tree.h:179 [inline]
 __set_ino_bitmap fs/f2fs/checkpoint.c:784 [inline]
 __f2fs_add_ino_entry+0x782/0x830 fs/f2fs/checkpoint.c:842
 f2fs_record_inode_state fs/f2fs/inode.c:877 [inline]
 f2fs_evict_inode_work+0xa1/0x120 fs/f2fs/inode.c:887
 process_one_work kernel/workqueue.c:3387 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3470
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3551
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>