====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.2.121/6172 is trying to acquire lock: ffff88802c4dd238 (&trie->lock){-.-.}-{2:2}, at: trie_delete_elem+0x94/0x630 kernel/bpf/lpm_trie.c:466 but task is already holding lock: ffff8880b8e37da8 (stock_lock){..-.}-{2:2}, at: local_lock_acquire include/linux/local_lock_internal.h:29 [inline] ffff8880b8e37da8 (stock_lock){..-.}-{2:2}, at: refill_stock+0xea/0x450 mm/memcontrol.c:2355 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (stock_lock){..-.}-{2:2}: local_lock_acquire include/linux/local_lock_internal.h:29 [inline] consume_obj_stock mm/memcontrol.c:3267 [inline] obj_cgroup_charge+0x10a/0x630 mm/memcontrol.c:3397 memcg_slab_pre_alloc_hook mm/slab.h:508 [inline] slab_pre_alloc_hook+0x2e2/0x300 mm/slab.h:719 slab_alloc_node mm/slub.c:3477 [inline] __kmem_cache_alloc_node+0x53/0x250 mm/slub.c:3534 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc_node+0xa6/0x240 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 -> #0 (&trie->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 __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_fdee3c9a1e8a2a6e+0x45/0x49 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:10295 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] percpu_ref_put_many include/linux/percpu-refcount.h:330 [inline] percpu_ref_put+0x35/0x180 include/linux/percpu-refcount.h:351 css_put include/linux/cgroup_refcnt.h:79 [inline] drain_stock mm/memcontrol.c:2304 [inline] __refill_stock+0x12a/0x3d0 mm/memcontrol.c:2341 refill_stock+0x19e/0x450 mm/memcontrol.c:2356 try_charge_memcg+0x1281/0x17c0 mm/memcontrol.c:2807 obj_cgroup_charge_pages mm/memcontrol.c:3138 [inline] obj_cgroup_charge+0x36e/0x630 mm/memcontrol.c:3429 memcg_slab_pre_alloc_hook mm/slab.h:508 [inline] slab_pre_alloc_hook+0x2e2/0x300 mm/slab.h:719 slab_alloc_node mm/slub.c:3477 [inline] slab_alloc mm/slub.c:3503 [inline] __kmem_cache_alloc_lru mm/slub.c:3510 [inline] kmem_cache_alloc_lru+0x4d/0x2b0 mm/slub.c:3526 __d_alloc+0x31/0x710 fs/dcache.c:1773 d_alloc_pseudo+0x1d/0x70 fs/dcache.c:1905 alloc_file_pseudo+0xe4/0x210 fs/file_table.c:363 __anon_inode_getfile fs/anon_inodes.c:122 [inline] anon_inode_getfile+0xc5/0x1a0 fs/anon_inodes.c:160 __do_sys_perf_event_open kernel/events/core.c:12907 [inline] __se_sys_perf_event_open+0xf37/0x1d40 kernel/events/core.c:12609 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(stock_lock); lock(&trie->lock); lock(stock_lock); lock(&trie->lock); *** DEADLOCK *** 4 locks held by syz.2.121/6172: #0: ffff88802a27f8a0 (&sig->exec_update_lock){++++}-{3:3}, at: __do_sys_perf_event_open kernel/events/core.c:12752 [inline] #0: ffff88802a27f8a0 (&sig->exec_update_lock){++++}-{3:3}, at: __se_sys_perf_event_open+0x9c2/0x1d40 kernel/events/core.c:12609 #1: ffff88805d0490a8 (&ctx->mutex){+.+.}-{3:3}, at: __do_sys_perf_event_open kernel/events/core.c:12776 [inline] #1: ffff88805d0490a8 (&ctx->mutex){+.+.}-{3:3}, at: __se_sys_perf_event_open+0xb77/0x1d40 kernel/events/core.c:12609 #2: ffff8880b8e37da8 (stock_lock){..-.}-{2:2}, at: local_lock_acquire include/linux/local_lock_internal.h:29 [inline] #2: ffff8880b8e37da8 (stock_lock){..-.}-{2:2}, at: refill_stock+0xea/0x450 mm/memcontrol.c:2355 #3: ffffffff8d1320e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline] #3: ffffffff8d1320e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline] #3: ffffffff8d1320e0 (rcu_read_lock){....}-{1:2}, at: trace_call_bpf+0xc3/0x6c0 kernel/trace/bpf_trace.c:142 stack backtrace: CPU: 0 PID: 6172 Comm: syz.2.121 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: 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 __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_fdee3c9a1e8a2a6e+0x45/0x49 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:10295 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] percpu_ref_put_many include/linux/percpu-refcount.h:330 [inline] percpu_ref_put+0x35/0x180 include/linux/percpu-refcount.h:351 css_put include/linux/cgroup_refcnt.h:79 [inline] drain_stock mm/memcontrol.c:2304 [inline] __refill_stock+0x12a/0x3d0 mm/memcontrol.c:2341 refill_stock+0x19e/0x450 mm/memcontrol.c:2356 try_charge_memcg+0x1281/0x17c0 mm/memcontrol.c:2807 obj_cgroup_charge_pages mm/memcontrol.c:3138 [inline] obj_cgroup_charge+0x36e/0x630 mm/memcontrol.c:3429 memcg_slab_pre_alloc_hook mm/slab.h:508 [inline] slab_pre_alloc_hook+0x2e2/0x300 mm/slab.h:719 slab_alloc_node mm/slub.c:3477 [inline] slab_alloc mm/slub.c:3503 [inline] __kmem_cache_alloc_lru mm/slub.c:3510 [inline] kmem_cache_alloc_lru+0x4d/0x2b0 mm/slub.c:3526 __d_alloc+0x31/0x710 fs/dcache.c:1773 d_alloc_pseudo+0x1d/0x70 fs/dcache.c:1905 alloc_file_pseudo+0xe4/0x210 fs/file_table.c:363 __anon_inode_getfile fs/anon_inodes.c:122 [inline] anon_inode_getfile+0xc5/0x1a0 fs/anon_inodes.c:160 __do_sys_perf_event_open kernel/events/core.c:12907 [inline] __se_sys_perf_event_open+0xf37/0x1d40 kernel/events/core.c:12609 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: 0033:0x7f29ddb9e159 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:00007f29dea42028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007f29dde25fa0 RCX: 00007f29ddb9e159 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000240 RBP: 00007f29ddc35024 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007f29dde26038 R14: 00007f29dde25fa0 R15: 00007ffd3b589c08