============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
syz.1.18/6001 is trying to acquire lock:
ffff88811fba0018 (&cluster->lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline]
ffff88811fba0018 (&cluster->lock){+.+.}-{3:3}, at: vswap_iter+0xfa/0x1b0 mm/vswap.c:274

but task is already holding lock:
ffff88811fba0018 (&cluster->lock){+.+.}-{3:3}, at: spin_lock_irq include/linux/spinlock.h:376 [inline]
ffff88811fba0018 (&cluster->lock){+.+.}-{3:3}, at: swap_cache_lock_irq+0xe2/0x190 mm/vswap.c:1529

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(&cluster->lock);
  lock(&cluster->lock);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

3 locks held by syz.1.18/6001:
 #0: ffff8881bb523440 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:391 [inline]
 #0: ffff8881bb523440 (&mm->mmap_lock){++++}-{4:4}, at: madvise_lock+0x152/0x2e0 mm/madvise.c:1789
 #1: ffff88811fba0018 (&cluster->lock){+.+.}-{3:3}, at: spin_lock_irq include/linux/spinlock.h:376 [inline]
 #1: ffff88811fba0018 (&cluster->lock){+.+.}-{3:3}, at: swap_cache_lock_irq+0xe2/0x190 mm/vswap.c:1529
 #2: ffffffff8e55a360 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #2: ffffffff8e55a360 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
 #2: ffffffff8e55a360 (rcu_read_lock){....}-{1:3}, at: vswap_cgroup_record+0x41/0x440 mm/vswap.c:1909

stack backtrace:
CPU: 0 UID: 0 PID: 6001 Comm: syz.1.18 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_deadlock_bug+0x279/0x290 kernel/locking/lockdep.c:3041
 check_deadlock kernel/locking/lockdep.c:3093 [inline]
 validate_chain kernel/locking/lockdep.c:3895 [inline]
 __lock_acquire+0x253f/0x2cf0 kernel/locking/lockdep.c:5237
 lock_acquire+0x106/0x330 kernel/locking/lockdep.c:5868
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:351 [inline]
 vswap_iter+0xfa/0x1b0 mm/vswap.c:274
 vswap_cgroup_record+0xeb/0x440 mm/vswap.c:1910
 swap_cgroup_record+0xc5/0x130 mm/vswap.c:1933
 memcg1_swapout+0x358/0x9e0 mm/memcontrol-v1.c:623
 __remove_mapping+0x7d4/0xa70 mm/vmscan.c:762
 shrink_folio_list+0x287c/0x5160 mm/vmscan.c:1518
 reclaim_folio_list+0x100/0x400 mm/vmscan.c:2198
 reclaim_pages+0x45b/0x530 mm/vmscan.c:2235
 madvise_cold_or_pageout_pte_range+0x1eac/0x2220 mm/madvise.c:444
 walk_pmd_range mm/pagewalk.c:130 [inline]
 walk_pud_range mm/pagewalk.c:224 [inline]
 walk_p4d_range mm/pagewalk.c:262 [inline]
 walk_pgd_range+0x1032/0x1d30 mm/pagewalk.c:303
 __walk_page_range+0x14c/0x710 mm/pagewalk.c:410
 walk_page_range_vma_unsafe+0x309/0x410 mm/pagewalk.c:714
 madvise_pageout_page_range mm/madvise.c:622 [inline]
 madvise_pageout mm/madvise.c:647 [inline]
 madvise_vma_behavior+0x2951/0x43c0 mm/madvise.c:1366
 madvise_walk_vmas+0x57a/0xaf0 mm/madvise.c:1721
 madvise_do_behavior+0x386/0x540 mm/madvise.c:1937
 do_madvise+0x1fa/0x2e0 mm/madvise.c:2030
 __do_sys_madvise mm/madvise.c:2039 [inline]
 __se_sys_madvise mm/madvise.c:2037 [inline]
 __x64_sys_madvise+0xa6/0xc0 mm/madvise.c:2037
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2b3459c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2b35495028 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007f2b34815fa0 RCX: 00007f2b3459c799
RDX: 0000000000000015 RSI: 0000000000600000 RDI: 0000200000000000
RBP: 00007f2b34632c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2b34816038 R14: 00007f2b34815fa0 R15: 00007ffcfbbae8f8
 </TASK>