======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.17/5940 is trying to acquire lock:
ffff8880b8e37de8 (stock_lock){..-.}-{2:2}, at: local_lock_acquire include/linux/local_lock_internal.h:29 [inline]
ffff8880b8e37de8 (stock_lock){..-.}-{2:2}, at: consume_stock mm/memcontrol.c:2274 [inline]
ffff8880b8e37de8 (stock_lock){..-.}-{2:2}, at: try_charge_memcg+0x21a/0x17c0 mm/memcontrol.c:2684

but task is already holding lock:
ffff88801bad4a38 (&trie->lock){-.-.}-{2:2}, at: trie_update_elem+0xc4/0xd60 kernel/bpf/lpm_trie.c:335

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&trie->lock){-.-.}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xb4/0x100 kernel/locking/spinlock.c:162
       trie_delete_elem+0x94/0x630 kernel/bpf/lpm_trie.c:466
       bpf_prog_2c29ac5cdc6b1842+0x42/0x46
       bpf_dispatcher_nop_func include/linux/bpf.h:1224 [inline]
       __bpf_prog_run include/linux/filter.h:617 [inline]
       bpf_prog_run include/linux/filter.h:624 [inline]
       bpf_prog_run_array include/linux/bpf.h:1994 [inline]
       trace_call_bpf+0x333/0x6c0 kernel/trace/bpf_trace.c:143
       perf_trace_run_bpf_submit+0x7a/0x1c0 kernel/events/core.c:10287
       perf_trace_lock_acquire+0x342/0x400 include/trace/events/lock.h:24
       trace_lock_acquire include/trace/events/lock.h:24 [inline]
       lock_acquire+0x3ef/0x420 kernel/locking/lockdep.c:5725
       rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
       rcu_read_lock include/linux/rcupdate.h:786 [inline]
       mod_objcg_mlstate+0xad/0x320 mm/memcontrol.c:2913
       mod_objcg_state+0x44b/0x8c0 mm/memcontrol.c:3254
       memcg_slab_free_hook+0x167/0x200 mm/slab.h:577
       slab_free mm/slub.c:3825 [inline]
       __kmem_cache_free+0xa3/0x1f0 mm/slub.c:3843
       rcu_do_batch kernel/rcu/tree.c:2194 [inline]
       rcu_core+0x9c1/0x17f0 kernel/rcu/tree.c:2467
       handle_softirqs+0x27d/0x820 kernel/softirq.c:578
       run_ksoftirqd+0xa8/0x100 kernel/softirq.c:950
       smpboot_thread_fn+0x651/0x9f0 kernel/smpboot.c:164
       kthread+0x2fa/0x390 kernel/kthread.c:388
       ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
       ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293

-> #0 (stock_lock){..-.}-{2:2}:
       check_prev_add kernel/locking/lockdep.c:3134 [inline]
       check_prevs_add kernel/locking/lockdep.c:3253 [inline]
       validate_chain kernel/locking/lockdep.c:3869 [inline]
       __lock_acquire+0x37ef/0x7d80 kernel/locking/lockdep.c:5137
       lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
       local_lock_acquire include/linux/local_lock_internal.h:29 [inline]
       consume_stock mm/memcontrol.c:2274 [inline]
       try_charge_memcg+0x237/0x17c0 mm/memcontrol.c:2684
       obj_cgroup_charge_pages mm/memcontrol.c:3138 [inline]
       __memcg_kmem_charge_page+0x224/0x380 mm/memcontrol.c:3164
       __alloc_pages+0x222/0x460 mm/page_alloc.c:4518
       __alloc_pages_node include/linux/gfp.h:237 [inline]
       alloc_pages_node include/linux/gfp.h:260 [inline]
       __kmalloc_large_node+0x8c/0x1f0 mm/slab_common.c:1148
       __do_kmalloc_node mm/slab_common.c:995 [inline]
       __kmalloc_node+0x112/0x240 mm/slab_common.c:1014
       kmalloc_node include/linux/slab.h:620 [inline]
       bpf_map_kmalloc_node+0xbc/0x1b0 kernel/bpf/syscall.c:424
       lpm_trie_node_alloc kernel/bpf/lpm_trie.c:291 [inline]
       trie_update_elem+0x172/0xd60 kernel/bpf/lpm_trie.c:338
       bpf_map_update_value+0x64b/0x710 kernel/bpf/syscall.c:203
       map_update_elem+0x586/0x710 kernel/bpf/syscall.c:1567
       __sys_bpf+0x6b5/0x890 kernel/bpf/syscall.c:5466
       __do_sys_bpf kernel/bpf/syscall.c:5582 [inline]
       __se_sys_bpf kernel/bpf/syscall.c:5580 [inline]
       __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5580
       do_syscall_x64 arch/x86/entry/common.c:46 [inline]
       do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&trie->lock);
                               lock(stock_lock);
                               lock(&trie->lock);
  lock(stock_lock);

 *** DEADLOCK ***

2 locks held by syz.0.17/5940:
 #0: ffffffff8d131da0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
 #0: ffffffff8d131da0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
 #0: ffffffff8d131da0 (rcu_read_lock){....}-{1:2}, at: bpf_map_update_value+0x408/0x710 kernel/bpf/syscall.c:202
 #1: ffff88801bad4a38 (&trie->lock){-.-.}-{2:2}, at: trie_update_elem+0xc4/0xd60 kernel/bpf/lpm_trie.c:335

stack backtrace:
CPU: 0 PID: 5940 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
 check_noncircular+0x2fc/0x400 kernel/locking/lockdep.c:2187
 check_prev_add kernel/locking/lockdep.c:3134 [inline]
 check_prevs_add kernel/locking/lockdep.c:3253 [inline]
 validate_chain kernel/locking/lockdep.c:3869 [inline]
 __lock_acquire+0x37ef/0x7d80 kernel/locking/lockdep.c:5137
 lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
 local_lock_acquire include/linux/local_lock_internal.h:29 [inline]
 consume_stock mm/memcontrol.c:2274 [inline]
 try_charge_memcg+0x237/0x17c0 mm/memcontrol.c:2684
 obj_cgroup_charge_pages mm/memcontrol.c:3138 [inline]
 __memcg_kmem_charge_page+0x224/0x380 mm/memcontrol.c:3164
 __alloc_pages+0x222/0x460 mm/page_alloc.c:4518
 __alloc_pages_node include/linux/gfp.h:237 [inline]
 alloc_pages_node include/linux/gfp.h:260 [inline]
 __kmalloc_large_node+0x8c/0x1f0 mm/slab_common.c:1148
 __do_kmalloc_node mm/slab_common.c:995 [inline]
 __kmalloc_node+0x112/0x240 mm/slab_common.c:1014
 kmalloc_node include/linux/slab.h:620 [inline]
 bpf_map_kmalloc_node+0xbc/0x1b0 kernel/bpf/syscall.c:424
 lpm_trie_node_alloc kernel/bpf/lpm_trie.c:291 [inline]
 trie_update_elem+0x172/0xd60 kernel/bpf/lpm_trie.c:338
 bpf_map_update_value+0x64b/0x710 kernel/bpf/syscall.c:203
 map_update_elem+0x586/0x710 kernel/bpf/syscall.c:1567
 __sys_bpf+0x6b5/0x890 kernel/bpf/syscall.c:5466
 __do_sys_bpf kernel/bpf/syscall.c:5582 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5580 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5580
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f4530d9e0d9
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:00007ffdbf9d3038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f4531025fa0 RCX: 00007f4530d9e0d9
RDX: 0000000000000020 RSI: 0000200000000080 RDI: 0000000000000002
RBP: 00007f4530e35024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4531025fac R14: 00007f4531025fa0 R15: 00007f4531025fa0
 </TASK>