Warning: Permanently added '[localhost]:46460' (ED25519) to the list of known hosts.
syzkaller login: [   57.371230][ T5802] cgroup: Unknown subsys name 'net'
[   57.484328][ T5802] cgroup: Unknown subsys name 'cpuset'
[   57.489585][ T5802] cgroup: Unknown subsys name 'rlimit'
[   57.682305][ T5803] soft_limit_in_bytes is deprecated and will be removed. Please report your usecase to linux-mm@kvack.org if you depend on this functionality.
executing program
[   57.700937][ T5806] loop0: detected capacity change from 0 to 764
[   57.711479][ T5806] 
[   57.712453][ T5806] ============================================
[   57.714738][ T5806] WARNING: possible recursive locking detected
[   57.716795][ T5806] syzkaller #0 Not tainted
[   57.718412][ T5806] --------------------------------------------
[   57.720692][ T5806] syz-executor625/5806 is trying to acquire lock:
[   57.723071][ T5806] ffff88811884c018 (&cluster->lock){+.+.}-{3:3}, at: vswap_iter+0xfa/0x1b0
[   57.726219][ T5806] 
[   57.726219][ T5806] but task is already holding lock:
[   57.728888][ T5806] ffff88811884c018 (&cluster->lock){+.+.}-{3:3}, at: swap_cache_lock_irq+0xe2/0x190
[   57.732141][ T5806] 
[   57.732141][ T5806] other info that might help us debug this:
[   57.734763][ T5806]  Possible unsafe locking scenario:
[   57.734763][ T5806] 
[   57.737665][ T5806]        CPU0
[   57.738780][ T5806]        ----
[   57.739968][ T5806]   lock(&cluster->lock);
[   57.741345][ T5806]   lock(&cluster->lock);
[   57.742644][ T5806] 
[   57.742644][ T5806]  *** DEADLOCK ***
[   57.742644][ T5806] 
[   57.744995][ T5806]  May be due to missing lock nesting notation
[   57.744995][ T5806] 
[   57.747255][ T5806] 3 locks held by syz-executor625/5806:
[   57.748781][ T5806]  #0: ffff888174bc2800 (&mm->mmap_lock){++++}-{4:4}, at: madvise_lock+0x152/0x2e0
[   57.751516][ T5806]  #1: ffff88811884c018 (&cluster->lock){+.+.}-{3:3}, at: swap_cache_lock_irq+0xe2/0x190
[   57.754852][ T5806]  #2: ffffffff8e55a360 (rcu_read_lock){....}-{1:3}, at: vswap_cgroup_record+0x40/0x290
[   57.758268][ T5806] 
[   57.758268][ T5806] stack backtrace: