================================================================== BUG: KCSAN: data-race in pfifo_fast_dequeue / pfifo_fast_enqueue write to 0xffff8881037acc00 of 8 bytes by task 21564 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+0x866/0xed0 net/sched/sch_generic.c:760 dequeue_skb net/sched/sch_generic.c:293 [inline] qdisc_restart net/sched/sch_generic.c:398 [inline] __qdisc_run+0x1a5/0x1130 net/sched/sch_generic.c:416 __dev_xmit_skb net/core/dev.c:3762 [inline] __dev_queue_xmit+0xec1/0x1dd0 net/core/dev.c:4301 dev_queue_xmit include/linux/netdevice.h:3091 [inline] llc_build_and_send_ui_pkt+0x1d1/0x1f0 net/llc/llc_output.c:67 llc_ui_sendmsg+0x68a/0x7e0 net/llc/af_llc.c:988 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x140/0x180 net/socket.c:745 sock_sendmsg+0x96/0xe0 net/socket.c:768 splice_to_socket+0x657/0x9d0 fs/splice.c:889 do_splice_from fs/splice.c:941 [inline] direct_splice_actor+0x16c/0x2c0 fs/splice.c:1164 splice_direct_to_actor+0x305/0x670 fs/splice.c:1108 do_splice_direct_actor fs/splice.c:1207 [inline] do_splice_direct+0xd7/0x150 fs/splice.c:1233 do_sendfile+0x3b9/0x970 fs/read_write.c:1295 __do_sys_sendfile64 fs/read_write.c:1362 [inline] __se_sys_sendfile64 fs/read_write.c:1348 [inline] __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1348 do_syscall_64+0xd3/0x1d0 entry_SYSCALL_64_after_hwframe+0x6d/0x75 read to 0xffff8881037acc00 of 8 bytes by task 21565 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+0xcc/0x2b0 net/sched/sch_generic.c:733 dev_qdisc_enqueue net/core/dev.c:3726 [inline] __dev_xmit_skb net/core/dev.c:3768 [inline] __dev_queue_xmit+0x7e5/0x1dd0 net/core/dev.c:4301 dev_queue_xmit include/linux/netdevice.h:3091 [inline] llc_build_and_send_ui_pkt+0x1d1/0x1f0 net/llc/llc_output.c:67 llc_ui_sendmsg+0x68a/0x7e0 net/llc/af_llc.c:988 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x140/0x180 net/socket.c:745 sock_sendmsg+0x96/0xe0 net/socket.c:768 splice_to_socket+0x657/0x9d0 fs/splice.c:889 do_splice_from fs/splice.c:941 [inline] direct_splice_actor+0x16c/0x2c0 fs/splice.c:1164 splice_direct_to_actor+0x305/0x670 fs/splice.c:1108 do_splice_direct_actor fs/splice.c:1207 [inline] do_splice_direct+0xd7/0x150 fs/splice.c:1233 do_sendfile+0x3b9/0x970 fs/read_write.c:1295 __do_sys_sendfile64 fs/read_write.c:1362 [inline] __se_sys_sendfile64 fs/read_write.c:1348 [inline] __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1348 do_syscall_64+0xd3/0x1d0 entry_SYSCALL_64_after_hwframe+0x6d/0x75 value changed: 0xffff888139970900 -> 0x0000000000000000 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 21565 Comm: syz-executor.4 Tainted: G W 6.8.0-syzkaller-11064-g82affc97affb #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 ==================================================================