=============================
WARNING: suspicious RCU usage
6.6.0-rc4-syzkaller #0 Not tainted
-----------------------------
lib/maple_tree.c:856 suspicious rcu_dereference_check() usage!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
no locks held by syz-executor.2/17280.

stack backtrace:
CPU: 1 PID: 17280 Comm: syz-executor.2 Not tainted 6.6.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x125/0x1b0 lib/dump_stack.c:106
 lockdep_rcu_suspicious+0x158/0x1e0 kernel/locking/lockdep.c:6711
 mas_root lib/maple_tree.c:856 [inline]
 mas_root lib/maple_tree.c:854 [inline]
 mas_start lib/maple_tree.c:1385 [inline]
 mas_state_walk lib/maple_tree.c:3705 [inline]
 mas_walk+0x29f/0x370 lib/maple_tree.c:4888
 mas_find_setup lib/maple_tree.c:5948 [inline]
 mas_find+0x14a/0x210 lib/maple_tree.c:5989
 vma_find include/linux/mm.h:954 [inline]
 do_mbind+0x916/0xac0 mm/mempolicy.c:1324
 kernel_mbind+0x17c/0x190 mm/mempolicy.c:1482
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fb029a7cae9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb02a7e10c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ed
RAX: ffffffffffffffda RBX: 00007fb029b9c050 RCX: 00007fb029a7cae9
RDX: 0000000000000003 RSI: 0000000000005000 RDI: 0000000020182000
RBP: 00007fb029ac847a R08: 000000000000007f R09: 0000000000000003
R10: 0000000020000040 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007fb029b9c050 R15: 00007ffe16f9f928
 </TASK>