=============================
WARNING: suspicious RCU usage
6.6.0-rc6-next-20231023-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.0/20548.

stack backtrace:
CPU: 0 PID: 20548 Comm: syz-executor.0 Not tainted 6.6.0-rc6-next-20231023-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+0x20b/0x3a0 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+0x4d1/0x7d0 lib/maple_tree.c:4888
 mas_find_setup lib/maple_tree.c:5948 [inline]
 mas_find+0x1e6/0x400 lib/maple_tree.c:5989
 vma_find include/linux/mm.h:952 [inline]
 do_mbind+0xc8f/0x1010 mm/mempolicy.c:1328
 kernel_mbind+0x1d4/0x1f0 mm/mempolicy.c:1486
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x62/0x6a
RIP: 0033:0x7fa43987cae9
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:00007fa43a5b10c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ed
RAX: ffffffffffffffda RBX: 00007fa43999c050 RCX: 00007fa43987cae9
RDX: 0000000000000003 RSI: 0000000000005000 RDI: 0000000020182000
RBP: 00007fa4398c847a R08: 000000000000007f R09: 0000000000000003
R10: 0000000020000040 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007fa43999c050 R15: 00007ffff6bedea8
 </TASK>

=============================
WARNING: suspicious RCU usage
6.6.0-rc6-next-20231023-syzkaller #0 Not tainted
-----------------------------
lib/maple_tree.c:812 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.0/20548.

stack backtrace:
CPU: 1 PID: 20548 Comm: syz-executor.0 Not tainted 6.6.0-rc6-next-20231023-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+0x20b/0x3a0 kernel/locking/lockdep.c:6711
 mt_slot lib/maple_tree.c:812 [inline]
 mt_slot lib/maple_tree.c:809 [inline]
 mtree_range_walk+0x6c5/0x9b0 lib/maple_tree.c:2827
 mas_state_walk lib/maple_tree.c:3712 [inline]
 mas_walk+0x374/0x7d0 lib/maple_tree.c:4888
 mas_find_setup lib/maple_tree.c:5948 [inline]
 mas_find+0x1e6/0x400 lib/maple_tree.c:5989
 vma_find include/linux/mm.h:952 [inline]
 do_mbind+0xc8f/0x1010 mm/mempolicy.c:1328
 kernel_mbind+0x1d4/0x1f0 mm/mempolicy.c:1486
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x62/0x6a
RIP: 0033:0x7fa43987cae9
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:00007fa43a5b10c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ed
RAX: ffffffffffffffda RBX: 00007fa43999c050 RCX: 00007fa43987cae9
RDX: 0000000000000003 RSI: 0000000000005000 RDI: 0000000020182000
RBP: 00007fa4398c847a R08: 000000000000007f R09: 0000000000000003
R10: 0000000020000040 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007fa43999c050 R15: 00007ffff6bedea8
 </TASK>