================================================================== BUG: KCSAN: data-race in pfifo_fast_dequeue / pfifo_fast_enqueue write to 0xffff88810e39b500 of 8 bytes by task 12516 on cpu 0: __ptr_ring_discard_one include/linux/ptr_ring.h:280 [inline] __ptr_ring_consume include/linux/ptr_ring.h:301 [inline] __skb_array_consume include/linux/skb_array.h:98 [inline] pfifo_fast_dequeue+0x25f/0x570 net/sched/sch_generic.c:651 dequeue_skb+0x145/0xf20 net/sched/sch_generic.c:263 qdisc_restart net/sched/sch_generic.c:366 [inline] __qdisc_run+0x72/0x180 net/sched/sch_generic.c:384 qdisc_run include/net/pkt_sched.h:136 [inline] __dev_xmit_skb net/core/dev.c:3765 [inline] __dev_queue_xmit+0xa75/0x1570 net/core/dev.c:4119 dev_queue_xmit+0x13/0x20 net/core/dev.c:4184 __bpf_tx_skb net/core/filter.c:2116 [inline] __bpf_redirect_common net/core/filter.c:2155 [inline] __bpf_redirect+0x67c/0x760 net/core/filter.c:2162 ____bpf_clone_redirect net/core/filter.c:2448 [inline] bpf_clone_redirect+0x168/0x1c0 net/core/filter.c:2420 bpf_prog_79bab0a1566dd526+0x56/0x18c bpf_dispatcher_nop_func include/linux/bpf.h:651 [inline] bpf_test_run+0x278/0x460 net/bpf/test_run.c:50 bpf_prog_test_run_skb+0x714/0xe90 net/bpf/test_run.c:582 bpf_prog_test_run kernel/bpf/syscall.c:3122 [inline] __do_sys_bpf+0x3971/0x9950 kernel/bpf/syscall.c:4400 __se_sys_bpf kernel/bpf/syscall.c:4340 [inline] __x64_sys_bpf+0x3d/0x50 kernel/bpf/syscall.c:4340 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88810e39b500 of 8 bytes by task 12512 on cpu 1: __ptr_ring_produce include/linux/ptr_ring.h:106 [inline] ptr_ring_produce include/linux/ptr_ring.h:129 [inline] skb_array_produce include/linux/skb_array.h:44 [inline] pfifo_fast_enqueue+0xdd/0x300 net/sched/sch_generic.c:626 __dev_xmit_skb net/core/dev.c:3764 [inline] __dev_queue_xmit+0x785/0x1570 net/core/dev.c:4119 dev_queue_xmit+0x13/0x20 net/core/dev.c:4184 __bpf_tx_skb net/core/filter.c:2116 [inline] __bpf_redirect_common net/core/filter.c:2155 [inline] __bpf_redirect+0x67c/0x760 net/core/filter.c:2162 ____bpf_clone_redirect net/core/filter.c:2448 [inline] bpf_clone_redirect+0x168/0x1c0 net/core/filter.c:2420 bpf_prog_79bab0a1566dd526+0x56/0x390 bpf_dispatcher_nop_func include/linux/bpf.h:651 [inline] bpf_test_run+0x278/0x460 net/bpf/test_run.c:50 bpf_prog_test_run_skb+0x714/0xe90 net/bpf/test_run.c:582 bpf_prog_test_run kernel/bpf/syscall.c:3122 [inline] __do_sys_bpf+0x3971/0x9950 kernel/bpf/syscall.c:4400 __se_sys_bpf kernel/bpf/syscall.c:4340 [inline] __x64_sys_bpf+0x3d/0x50 kernel/bpf/syscall.c:4340 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 12512 Comm: syz-executor.2 Not tainted 5.11.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================