=============================
WARNING: suspicious RCU usage
syzkaller #0 Not tainted
-----------------------------
./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 syz-executor/5631: 2, last CPU#1:
 #0: ffff8880349920e8 (&type->s_umount_key#70){+.+.}-{4:4}, at: __super_lock fs/super.c:60 [inline]
 #0: ffff8880349920e8 (&type->s_umount_key#70){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:75 [inline]
 #0: ffff8880349920e8 (&type->s_umount_key#70){+.+.}-{4:4}, at: deactivate_super+0xac/0xe0 fs/super.c:631
 #1: ffff88801b7f08c8 (&im->ino_lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:347 [inline]
 #1: ffff88801b7f08c8 (&im->ino_lock){+.+.}-{3:3}, at: __clear_ino_bitmap fs/f2fs/checkpoint.c:809 [inline]
 #1: ffff88801b7f08c8 (&im->ino_lock){+.+.}-{3:3}, at: f2fs_remove_ino_entry+0x18d/0x3f0 fs/f2fs/checkpoint.c:855

stack backtrace:
CPU: 1 UID: 0 PID: 5631 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
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]
 __clear_ino_bitmap fs/f2fs/checkpoint.c:812 [inline]
 f2fs_remove_ino_entry+0x3ae/0x3f0 fs/f2fs/checkpoint.c:855
 f2fs_delete_inode fs/f2fs/inode.c:946 [inline]
 f2fs_evict_inode+0x83d/0x21f0 fs/f2fs/inode.c:1100
 evict+0x624/0xb50 fs/inode.c:822
 f2fs_pre_evict_inode fs/f2fs/inode.c:911 [inline]
 f2fs_evict_inode+0x20f/0x21f0 fs/f2fs/inode.c:1096
 evict+0x624/0xb50 fs/inode.c:822
 dispose_list fs/inode.c:864 [inline]
 evict_inodes+0x7e3/0x870 fs/inode.c:918
 generic_shutdown_super+0xaa/0x2d0 fs/super.c:755
 kill_block_super+0x44/0xa0 fs/super.c:1918
 kill_f2fs_super+0x3b3/0x700 fs/f2fs/super.c:5635
 deactivate_locked_super+0xbc/0x110 fs/super.c:603
 cleanup_mnt+0x3d3/0x460 fs/namespace.c:1317
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x73a/0x2360 kernel/exit.c:1008
 do_group_exit+0x22d/0x2f0 kernel/exit.c:1151
 __do_sys_exit_group kernel/exit.c:1162 [inline]
 __se_sys_exit_group kernel/exit.c:1160 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1160
 x64_sys_call+0x18c6/0x18d0 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdbdbf9e0d9
Code: Unable to access opcode bytes at 0x7fdbdbf9e0af.
RSP: 002b:00007fff41ea9818 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fdbdc034499 RCX: 00007fdbdbf9e0d9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000075 R08: 0000000000000000 R09: 00007fdbdc034474
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff41eaaad0
R13: 00007fdbdc034474 R14: 0000000000017975 R15: 00007fff41eabba0
 </TASK>