============================================
WARNING: possible recursive locking detected
6.9.0-syzkaller-12088-g52a2f0608366 #0 Not tainted
--------------------------------------------
syz-executor.1/13270 is trying to acquire lock:
ffff8880113c8820 (&htab->buckets[i].lock){+.-.}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
ffff8880113c8820 (&htab->buckets[i].lock){+.-.}-{2:2}, at: sock_hash_delete_elem+0x17c/0x400 net/core/sock_map.c:957

but task is already holding lock:
ffff8880113cd020 (&htab->buckets[i].lock){+.-.}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
ffff8880113cd020 (&htab->buckets[i].lock){+.-.}-{2:2}, at: sock_hash_delete_elem+0x17c/0x400 net/core/sock_map.c:957

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

       CPU0
       ----
  lock(&htab->buckets[i].lock);
  lock(&htab->buckets[i].lock);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

7 locks held by syz-executor.1/13270:
 #0: ffff8880228c80c8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x310 fs/file.c:1191
 #1: ffff88802d4d8420 (sb_writers#4){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2854 [inline]
 #1: ffff88802d4d8420 (sb_writers#4){.+.+}-{0:0}, at: vfs_write+0x227/0xc90 fs/read_write.c:586
 #2: ffff88802d4dab98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1772 [inline]
 #2: ffff88802d4dab98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1bf/0x3c0 fs/ext4/inode.c:2767
 #3: ffffffff8e333e60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
 #3: ffffffff8e333e60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline]
 #3: ffffffff8e333e60 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2402 [inline]
 #3: ffffffff8e333e60 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run3+0x24c/0x5a0 kernel/trace/bpf_trace.c:2445
 #4: ffff8880113cd020 (&htab->buckets[i].lock){+.-.}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
 #4: ffff8880113cd020 (&htab->buckets[i].lock){+.-.}-{2:2}, at: sock_hash_delete_elem+0x17c/0x400 net/core/sock_map.c:957
 #5: ffff888053c052b0 (&psock->link_lock){+...}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
 #5: ffff888053c052b0 (&psock->link_lock){+...}-{2:2}, at: sock_map_del_link net/core/sock_map.c:157 [inline]
 #5: ffff888053c052b0 (&psock->link_lock){+...}-{2:2}, at: sock_map_unref+0xcc/0x5e0 net/core/sock_map.c:192
 #6: ffffffff8e333e60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
 #6: ffffffff8e333e60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline]
 #6: ffffffff8e333e60 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2402 [inline]
 #6: ffffffff8e333e60 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x1fc/0x540 kernel/trace/bpf_trace.c:2444

stack backtrace:
CPU: 1 PID: 13270 Comm: syz-executor.1 Not tainted 6.9.0-syzkaller-12088-g52a2f0608366 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 check_deadlock kernel/locking/lockdep.c:3062 [inline]
 validate_chain+0x15d3/0x5900 kernel/locking/lockdep.c:3856
 __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
 _raw_spin_lock_bh+0x35/0x50 kernel/locking/spinlock.c:178
 spin_lock_bh include/linux/spinlock.h:356 [inline]
 sock_hash_delete_elem+0x17c/0x400 net/core/sock_map.c:957
 bpf_prog_3ffd2c70e20892c6+0x42/0x4b
 bpf_dispatcher_nop_func include/linux/bpf.h:1243 [inline]
 __bpf_prog_run include/linux/filter.h:691 [inline]
 bpf_prog_run include/linux/filter.h:698 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2403 [inline]
 bpf_trace_run2+0x2ec/0x540 kernel/trace/bpf_trace.c:2444
 trace_kfree include/trace/events/kmem.h:94 [inline]
 kfree+0x2bb/0x360 mm/slub.c:4544
 sk_psock_free_link include/linux/skmsg.h:423 [inline]
 sock_map_del_link net/core/sock_map.c:170 [inline]
 sock_map_unref+0x3ac/0x5e0 net/core/sock_map.c:192
 sock_hash_delete_elem+0x392/0x400 net/core/sock_map.c:961
 bpf_prog_2c29ac5cdc6b1842+0x42/0x46
 bpf_dispatcher_nop_func include/linux/bpf.h:1243 [inline]
 __bpf_prog_run include/linux/filter.h:691 [inline]
 bpf_prog_run include/linux/filter.h:698 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2403 [inline]
 bpf_trace_run3+0x33a/0x5a0 kernel/trace/bpf_trace.c:2445
 trace_block_bio_remap include/trace/events/block.h:507 [inline]
 blk_partition_remap block/blk-core.c:575 [inline]
 submit_bio_noacct+0x1bab/0x1cc0 block/blk-core.c:772
 ext4_io_submit+0xda/0x140 fs/ext4/page-io.c:377
 ext4_do_writepages+0x2e09/0x3d40 fs/ext4/inode.c:2699
 ext4_writepages+0x213/0x3c0 fs/ext4/inode.c:2768
 do_writepages+0x359/0x870 mm/page-writeback.c:2634
 filemap_fdatawrite_wbc+0x125/0x180 mm/filemap.c:397
 __filemap_fdatawrite_range mm/filemap.c:430 [inline]
 file_write_and_wait_range+0x1aa/0x290 mm/filemap.c:788
 ext4_sync_file+0x260/0xb90 fs/ext4/fsync.c:158
 generic_write_sync include/linux/fs.h:2794 [inline]
 ext4_buffered_write_iter+0x286/0x350 fs/ext4/file.c:305
 ext4_file_write_iter+0x1de/0x1a10
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0xa72/0xc90 fs/read_write.c:590
 ksys_write+0x1a0/0x2c0 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f984d07cee9
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:00007f984debe0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f984d1b3f80 RCX: 00007f984d07cee9
RDX: 0000000000040001 RSI: 0000000020000180 RDI: 000000000000000a
RBP: 00007f984d0c947f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f984d1b3f80 R15: 00007ffc00f7dfe8
 </TASK>