Warning: Permanently added '10.128.1.56' (ECDSA) to the list of known hosts.
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syzkaller login: [  110.265530][ T9905] IPVS: ftp: loaded support on port[0] = 21
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[  125.627889][T10129] 
[  125.630417][T10129] ======================================================
[  125.637607][T10129] WARNING: possible circular locking dependency detected
[  125.645338][T10129] 5.6.0-rc1-syzkaller #0 Not tainted
[  125.650607][T10129] ------------------------------------------------------
[  125.657922][T10129] syz-executor432/10129 is trying to acquire lock:
[  125.664633][T10129] ffff8880988693e0 (&htab->buckets[i].lock){....}, at: htab_lru_map_delete_node+0xce/0x2f0
[  125.674731][T10129] 
[  125.674731][T10129] but task is already holding lock:
[  125.682301][T10129] ffff888098869a18 (&l->lock){....}, at: bpf_lru_pop_free+0x67f/0x1670
[  125.690542][T10129] 
[  125.690542][T10129] which lock already depends on the new lock.
[  125.690542][T10129] 
[  125.701077][T10129] 
[  125.701077][T10129] the existing dependency chain (in reverse order) is:
[  125.710124][T10129] 
[  125.710124][T10129] -> #2 (&l->lock){....}:
[  125.716753][T10129]        _raw_spin_lock+0x2f/0x40
[  125.721769][T10129]        bpf_lru_pop_free+0x67f/0x1670
[  125.727222][T10129]        prealloc_lru_pop+0x2c/0xa0
[  125.732424][T10129]        __htab_lru_percpu_map_update_elem+0x67e/0xa90
[  125.739272][T10129]        bpf_percpu_hash_update+0x16e/0x210
[  125.745155][T10129]        bpf_map_update_value.isra.0+0x2d7/0x8e0
[  125.751658][T10129]        generic_map_update_batch+0x41f/0x610
[  125.757742][T10129]        bpf_map_do_batch+0x3f5/0x510
[  125.763142][T10129]        __do_sys_bpf+0x9b7/0x41e0
[  125.768291][T10129]        __x64_sys_bpf+0x73/0xb0
[  125.773213][T10129]        do_syscall_64+0xfa/0x790
[  125.778230][T10129]        entry_SYSCALL_64_after_hwframe+0x49/0xbe
[  125.784752][T10129] 
[  125.784752][T10129] -> #1 (&loc_l->lock){....}:
[  125.791818][T10129]        _raw_spin_lock_irqsave+0x95/0xcd
[  125.797977][T10129]        bpf_lru_push_free+0x250/0x5b0
[  125.803436][T10129]        __htab_map_lookup_and_delete_batch+0x8d4/0x1540
[  125.810457][T10129]        htab_lru_map_lookup_and_delete_batch+0x34/0x40
[  125.817408][T10129]        bpf_map_do_batch+0x3f5/0x510
[  125.822781][T10129]        __do_sys_bpf+0x1f7d/0x41e0
[  125.828143][T10129]        __x64_sys_bpf+0x73/0xb0
[  125.833220][T10129]        do_syscall_64+0xfa/0x790
[  125.838253][T10129]        entry_SYSCALL_64_after_hwframe+0x49/0xbe
[  125.844756][T10129] 
[  125.844756][T10129] -> #0 (&htab->buckets[i].lock){....}:
[  125.852472][T10129]        __lock_acquire+0x2596/0x4a00
[  125.857837][T10129]        lock_acquire+0x190/0x410
[  125.862849][T10129]        _raw_spin_lock_irqsave+0x95/0xcd
[  125.869260][T10129]        htab_lru_map_delete_node+0xce/0x2f0
[  125.875842][T10129]        __bpf_lru_list_shrink+0xf9/0x470
[  125.881637][T10129]        bpf_lru_pop_free+0x87c/0x1670
[  125.887135][T10129]        prealloc_lru_pop+0x2c/0xa0
[  125.892372][T10129]        __htab_lru_percpu_map_update_elem+0x67e/0xa90
[  125.899225][T10129]        bpf_percpu_hash_update+0x16e/0x210
[  125.905222][T10129]        bpf_map_update_value.isra.0+0x2d7/0x8e0
[  125.911536][T10129]        generic_map_update_batch+0x41f/0x610
[  125.917676][T10129]        bpf_map_do_batch+0x3f5/0x510
[  125.923051][T10129]        __do_sys_bpf+0x9b7/0x41e0
[  125.928147][T10129]        __x64_sys_bpf+0x73/0xb0
[  125.933078][T10129]        do_syscall_64+0xfa/0x790
[  125.938088][T10129]        entry_SYSCALL_64_after_hwframe+0x49/0xbe
[  125.944539][T10129] 
[  125.944539][T10129] other info that might help us debug this:
[  125.944539][T10129] 
[  125.954774][T10129] Chain exists of:
[  125.954774][T10129]   &htab->buckets[i].lock --> &loc_l->lock --> &l->lock
[  125.954774][T10129] 
[  125.967613][T10129]  Possible unsafe locking scenario:
[  125.967613][T10129] 
[  125.975178][T10129]        CPU0                    CPU1
[  125.980765][T10129]        ----                    ----
[  125.986119][T10129]   lock(&l->lock);
[  125.990025][T10129]                                lock(&loc_l->lock);
[  125.996710][T10129]                                lock(&l->lock);
[  126.003065][T10129]   lock(&htab->buckets[i].lock);
[  126.008076][T10129] 
[  126.008076][T10129]  *** DEADLOCK ***
[  126.008076][T10129] 
[  126.016220][T10129] 3 locks held by syz-executor432/10129:
[  126.021880][T10129]  #0: ffffffff89bac240 (rcu_read_lock){....}, at: bpf_percpu_hash_update+0x0/0x210
[  126.031399][T10129]  #1: ffffe8ffffc49e40 (&loc_l->lock){....}, at: bpf_lru_pop_free+0x32b/0x1670
[  126.040625][T10129]  #2: ffff888098869a18 (&l->lock){....}, at: bpf_lru_pop_free+0x67f/0x1670
[  126.049357][T10129] 
[  126.049357][T10129] stack backtrace:
[  126.055356][T10129] CPU: 0 PID: 10129 Comm: syz-executor432 Not tainted 5.6.0-rc1-syzkaller #0
[  126.064096][T10129] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  126.074802][T10129] Call Trace:
[  126.078086][T10129]  dump_stack+0x197/0x210
[  126.082461][T10129]  print_circular_bug.isra.0.cold+0x163/0x172
[  126.088588][T10129]  check_noncircular+0x32e/0x3e0
[  126.093519][T10129]  ? do_huge_pmd_anonymous_page+0x1454/0x1a50
[  126.099582][T10129]  ? print_circular_bug.isra.0+0x230/0x230
[  126.105382][T10129]  ? do_huge_pmd_anonymous_page+0x1454/0x1a50
[  126.111450][T10129]  ? alloc_list_entry+0xc0/0xc0
[  126.116305][T10129]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[  126.122548][T10129]  ? find_first_zero_bit+0x9a/0xc0
[  126.127654][T10129]  __lock_acquire+0x2596/0x4a00
[  126.132752][T10129]  ? do_raw_spin_unlock+0x181/0x270
[  126.137992][T10129]  ? mark_held_locks+0xf0/0xf0
[  126.142841][T10129]  ? __kasan_check_read+0x11/0x20
[  126.148311][T10129]  ? __lock_acquire+0x16f2/0x4a00
[  126.153325][T10129]  lock_acquire+0x190/0x410
[  126.157966][T10129]  ? htab_lru_map_delete_node+0xce/0x2f0
[  126.163594][T10129]  _raw_spin_lock_irqsave+0x95/0xcd
[  126.169022][T10129]  ? htab_lru_map_delete_node+0xce/0x2f0
[  126.174649][T10129]  htab_lru_map_delete_node+0xce/0x2f0
[  126.180098][T10129]  ? __kasan_check_write+0x14/0x20
[  126.185197][T10129]  __bpf_lru_list_shrink+0xf9/0x470
[  126.190392][T10129]  bpf_lru_pop_free+0x87c/0x1670
[  126.195348][T10129]  prealloc_lru_pop+0x2c/0xa0
[  126.200039][T10129]  __htab_lru_percpu_map_update_elem+0x67e/0xa90
[  126.206454][T10129]  bpf_percpu_hash_update+0x16e/0x210
[  126.211886][T10129]  bpf_map_update_value.isra.0+0x2d7/0x8e0
[  126.217771][T10129]  generic_map_update_batch+0x41f/0x610
[  126.223968][T10129]  ? generic_map_delete_batch+0x6a0/0x6a0
[  126.229724][T10129]  ? __fget_light+0x1ad/0x270
[  126.234406][T10129]  ? generic_map_delete_batch+0x6a0/0x6a0
[  126.240119][T10129]  bpf_map_do_batch+0x3f5/0x510
[  126.244965][T10129]  __do_sys_bpf+0x9b7/0x41e0
[  126.249666][T10129]  ? find_held_lock+0x35/0x130
[  126.254419][T10129]  ? bpf_prog_load+0x1820/0x1820
[  126.259340][T10129]  ? lock_downgrade+0x920/0x920
[  126.264206][T10129]  ? handle_mm_fault+0x292/0xa50
[  126.269139][T10129]  ? trace_hardirqs_on_thunk+0x1a/0x1c
[  126.274587][T10129]  ? do_syscall_64+0x26/0x790
[  126.279356][T10129]  ? entry_SYSCALL_64_after_hwframe+0x49/0xbe
[  126.286809][T10129]  ? do_syscall_64+0x26/0x790
[  126.291482][T10129]  __x64_sys_bpf+0x73/0xb0
[  126.296026][T10129]  do_syscall_64+0xfa/0x790
[  126.300554][T10129]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[  126.306500][T10129] RIP: 0033:0x446b99
[  126.310492][T10129] Code: e8 bc b4 02 00 48 83 c4 18 c3 0f 1f 80 00 00 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 0f 83 ab 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00
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[  126.330198][T10129] RSP: 002b:00007f14c0df8db8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
[  126.338803][T10129] RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 0000000000446b99
[  126.346758][T10129] RDX: 0000000000000038 RSI: 0000000020000040 RDI: 000000000000001a
[  126.354769][T10129] RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000
[  126.363193][T10129] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc2c
[  126.371298][T10129] R13: 00007ffc51c1364f R14: 00007f14c0df99c0 R15: 0000000000000000
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