====================================================== WARNING: possible circular locking dependency detected 6.11.0-rc6-syzkaller-00019-g67784a74e258 #0 Not tainted ------------------------------------------------------ kworker/2:5/22857 is trying to acquire lock: ffff88802b83dd18 (&pool->lock){-.-.}-{2:2}, at: __queue_work+0x26b/0x1070 kernel/workqueue.c:2301 but task is already holding lock: ffff88802b8397e0 (stock_lock){..-.}-{2:2}, at: local_lock_acquire+0x10/0x150 include/linux/local_lock_internal.h:29 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (stock_lock){..-.}-{2:2}: local_lock_acquire+0x23/0x150 include/linux/local_lock_internal.h:29 consume_obj_stock mm/memcontrol.c:2789 [inline] obj_cgroup_charge+0x7e/0x4d0 mm/memcontrol.c:2919 __memcg_slab_post_alloc_hook+0x1b6/0x9c0 mm/memcontrol.c:3012 memcg_slab_post_alloc_hook mm/slub.c:2160 [inline] slab_post_alloc_hook mm/slub.c:3998 [inline] slab_alloc_node mm/slub.c:4037 [inline] __do_kmalloc_node mm/slub.c:4157 [inline] __kmalloc_node_noprof+0x3c0/0x440 mm/slub.c:4164 kmalloc_node_noprof include/linux/slab.h:708 [inline] bpf_map_kmalloc_node+0x98/0x4a0 kernel/bpf/syscall.c:422 lpm_trie_node_alloc kernel/bpf/lpm_trie.c:299 [inline] trie_update_elem+0x1ef/0xdb0 kernel/bpf/lpm_trie.c:342 bpf_map_update_value+0x2c1/0x6c0 kernel/bpf/syscall.c:203 generic_map_update_batch+0x454/0x5f0 kernel/bpf/syscall.c:1889 bpf_map_do_batch+0x615/0x6e0 kernel/bpf/syscall.c:5218 __sys_bpf+0x151b/0x55e0 kernel/bpf/syscall.c:5774 __do_sys_bpf kernel/bpf/syscall.c:5817 [inline] __se_sys_bpf kernel/bpf/syscall.c:5815 [inline] __ia32_sys_bpf+0x76/0xe0 kernel/bpf/syscall.c:5815 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e -> #2 (&trie->lock){..-.}-{2:2}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 trie_delete_elem+0xb0/0x820 kernel/bpf/lpm_trie.c:462 0xffffffffa0001e0d 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:2406 [inline] bpf_trace_run2+0x231/0x590 kernel/trace/bpf_trace.c:2447 __traceiter_timer_start+0x64/0xb0 include/trace/events/timer.h:52 trace_timer_start include/trace/events/timer.h:52 [inline] enqueue_timer+0x2b4/0x550 kernel/time/timer.c:663 internal_add_timer kernel/time/timer.c:688 [inline] __mod_timer+0x8d7/0xdc0 kernel/time/timer.c:1183 sk_reset_timer+0x21/0xc0 net/core/sock.c:3440 tipc_sk_finish_conn+0x183/0x790 net/tipc/socket.c:1673 tipc_socketpair+0x364/0x470 net/tipc/socket.c:3349 __sys_socketpair+0x2f0/0x5a0 net/socket.c:1786 __do_sys_socketpair net/socket.c:1822 [inline] __se_sys_socketpair net/socket.c:1819 [inline] __ia32_sys_socketpair+0x95/0x100 net/socket.c:1819 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e -> #1 (&base->lock){-.-.}-{2:2}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 lock_timer_base+0x5d/0x220 kernel/time/timer.c:1051 __mod_timer+0x426/0xdc0 kernel/time/timer.c:1132 worker_enter_idle+0x425/0x570 kernel/workqueue.c:1052 create_worker+0x302/0x800 kernel/workqueue.c:2819 maybe_create_worker kernel/workqueue.c:3056 [inline] manage_workers kernel/workqueue.c:3108 [inline] worker_thread+0x9a0/0xed0 kernel/workqueue.c:3364 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 -> #0 (&pool->lock){-.-.}-{2:2}: check_prev_add kernel/locking/lockdep.c:3133 [inline] check_prevs_add kernel/locking/lockdep.c:3252 [inline] validate_chain kernel/locking/lockdep.c:3868 [inline] __lock_acquire+0x24ed/0x3cb0 kernel/locking/lockdep.c:5142 lock_acquire kernel/locking/lockdep.c:5759 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5724 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 __queue_work+0x26b/0x1070 kernel/workqueue.c:2301 queue_work_on+0x11a/0x140 kernel/workqueue.c:2392 percpu_ref_put_many include/linux/percpu-refcount.h:335 [inline] percpu_ref_put include/linux/percpu-refcount.h:351 [inline] css_put include/linux/cgroup_refcnt.h:79 [inline] css_put include/linux/cgroup_refcnt.h:76 [inline] drain_stock+0x284/0x2e0 mm/memcontrol.c:1774 drain_local_stock+0xbb/0x330 mm/memcontrol.c:1793 process_one_work+0x958/0x1ad0 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xed0 kernel/workqueue.c:3389 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 other info that might help us debug this: Chain exists of: &pool->lock --> &trie->lock --> stock_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(stock_lock); lock(&trie->lock); lock(stock_lock); lock(&pool->lock); *** DEADLOCK *** 5 locks held by kworker/2:5/22857: #0: ffff88801ac88948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x11f0/0x1ad0 kernel/workqueue.c:3206 #1: ffffc90002ba7d80 ((work_completion)(&({ do { const void *__vpp_verify = (typeof((&memcg_stock) + 0))((void *)0); (void)__vpp_verify; } while (0); ({ unsigned long __ptr; __asm__ ("" : "=r"(__ptr) : "0"((typeof(*((&memcg_stock))) *)((&memcg_stock)))); (typeof((typeof(*((&memcg_stock))) *)((&memcg_stock)))) (__ptr + (((__per_cpu_offset[(cpu)])))); }); })->work)){+.+.}-{0:0}, at: process_one_work+0x8bb/0x1ad0 kernel/workqueue.c:3207 #2: ffff88802b8397e0 (stock_lock){..-.}-{2:2}, at: local_lock_acquire+0x10/0x150 include/linux/local_lock_internal.h:29 #3: ffffffff8ddb94a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline] #3: ffffffff8ddb94a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline] #3: ffffffff8ddb94a0 (rcu_read_lock){....}-{1:2}, at: percpu_ref_put_many include/linux/percpu-refcount.h:330 [inline] #3: ffffffff8ddb94a0 (rcu_read_lock){....}-{1:2}, at: percpu_ref_put include/linux/percpu-refcount.h:351 [inline] #3: ffffffff8ddb94a0 (rcu_read_lock){....}-{1:2}, at: css_put include/linux/cgroup_refcnt.h:79 [inline] #3: ffffffff8ddb94a0 (rcu_read_lock){....}-{1:2}, at: css_put include/linux/cgroup_refcnt.h:76 [inline] #3: ffffffff8ddb94a0 (rcu_read_lock){....}-{1:2}, at: drain_stock+0x13c/0x2e0 mm/memcontrol.c:1774 #4: ffffffff8ddb94a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline] #4: ffffffff8ddb94a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline] #4: ffffffff8ddb94a0 (rcu_read_lock){....}-{1:2}, at: __queue_work+0xf2/0x1070 kernel/workqueue.c:2261 stack backtrace: CPU: 2 UID: 0 PID: 22857 Comm: kworker/2:5 Not tainted 6.11.0-rc6-syzkaller-00019-g67784a74e258 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Workqueue: events drain_local_stock Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:119 check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2186 check_prev_add kernel/locking/lockdep.c:3133 [inline] check_prevs_add kernel/locking/lockdep.c:3252 [inline] validate_chain kernel/locking/lockdep.c:3868 [inline] __lock_acquire+0x24ed/0x3cb0 kernel/locking/lockdep.c:5142 lock_acquire kernel/locking/lockdep.c:5759 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5724 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 __queue_work+0x26b/0x1070 kernel/workqueue.c:2301 queue_work_on+0x11a/0x140 kernel/workqueue.c:2392 percpu_ref_put_many include/linux/percpu-refcount.h:335 [inline] percpu_ref_put include/linux/percpu-refcount.h:351 [inline] css_put include/linux/cgroup_refcnt.h:79 [inline] css_put include/linux/cgroup_refcnt.h:76 [inline] drain_stock+0x284/0x2e0 mm/memcontrol.c:1774 drain_local_stock+0xbb/0x330 mm/memcontrol.c:1793 process_one_work+0x958/0x1ad0 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xed0 kernel/workqueue.c:3389 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244