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BUG: KMSAN: uninit-value in skbprio_enqueue+0xb8f/0x18f0 net/sched/sch_skbprio.c:82
CPU: 0 PID: 19196 Comm: kworker/u4:20 Not tainted 5.6.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: krdsd rds_shutdown_worker
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1c9/0x220 lib/dump_stack.c:118
 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215
 skbprio_enqueue+0xb8f/0x18f0 net/sched/sch_skbprio.c:82
 __dev_xmit_skb net/core/dev.c:3710 [inline]
 __dev_queue_xmit+0x1c00/0x3b20 net/core/dev.c:4021
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4085
 neigh_hh_output include/net/neighbour.h:499 [inline]
 neigh_output include/net/neighbour.h:508 [inline]
 ip_finish_output2+0x20fd/0x2610 net/ipv4/ip_output.c:228
 __ip_finish_output+0xaa7/0xd80 net/ipv4/ip_output.c:306
 ip_finish_output+0x166/0x410 net/ipv4/ip_output.c:316
 NF_HOOK_COND include/linux/netfilter.h:296 [inline]
 ip_output+0x593/0x680 net/ipv4/ip_output.c:430
 dst_output include/net/dst.h:436 [inline]
 ip_local_out net/ipv4/ip_output.c:125 [inline]
 __ip_queue_xmit+0x1b5c/0x21a0 net/ipv4/ip_output.c:530
 ip_queue_xmit+0xcc/0xf0 include/net/ip.h:237
 __tcp_transmit_skb+0x439c/0x6090 net/ipv4/tcp_output.c:1234
 tcp_transmit_skb net/ipv4/tcp_output.c:1250 [inline]
 tcp_write_xmit+0x30e1/0xb470 net/ipv4/tcp_output.c:2513
 __tcp_push_pending_frames+0x124/0x4e0 net/ipv4/tcp_output.c:2689
 tcp_send_fin+0x131e/0x1570 net/ipv4/tcp_output.c:3235
 tcp_close+0xaa8/0x1830 net/ipv4/tcp.c:2425
 inet_release+0x1f7/0x270 net/ipv4/af_inet.c:427
 __sock_release net/socket.c:605 [inline]
 sock_release+0xde/0x2c0 net/socket.c:625
 rds_tcp_conn_path_shutdown+0x3a0/0x4f0 net/rds/tcp_connect.c:216
 rds_conn_shutdown+0x6c1/0xa20 net/rds/connection.c:386
 rds_shutdown_worker+0x3e/0x50 net/rds/threads.c:247
 process_one_work+0x1555/0x1f40 kernel/workqueue.c:2266
 worker_thread+0xef6/0x2450 kernel/workqueue.c:2412
 kthread+0x4b5/0x4f0 kernel/kthread.c:256
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:353

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline]
 kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:310
 __msan_chain_origin+0x50/0x90 mm/kmsan/kmsan_instr.c:165
 skbprio_change+0xba/0xc0 net/sched/sch_skbprio.c:172
 qdisc_change net/sched/sch_api.c:1321 [inline]
 tc_modify_qdisc+0x2b80/0x31c0 net/sched/sch_api.c:1623
 rtnetlink_rcv_msg+0x1153/0x1570 net/core/rtnetlink.c:5436
 netlink_rcv_skb+0x451/0x650 net/netlink/af_netlink.c:2478
 rtnetlink_rcv+0x50/0x60 net/core/rtnetlink.c:5454
 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
 netlink_unicast+0xf9e/0x1100 net/netlink/af_netlink.c:1329
 netlink_sendmsg+0x1246/0x14d0 net/netlink/af_netlink.c:1918
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 ____sys_sendmsg+0x12b6/0x1350 net/socket.c:2345
 ___sys_sendmsg net/socket.c:2399 [inline]
 __sys_sendmsg+0x451/0x5f0 net/socket.c:2432
 __do_sys_sendmsg net/socket.c:2441 [inline]
 __se_sys_sendmsg+0x97/0xb0 net/socket.c:2439
 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2439
 do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline]
 kmsan_internal_poison_shadow+0x66/0xd0 mm/kmsan/kmsan.c:127
 kmsan_slab_alloc+0x8a/0xe0 mm/kmsan/kmsan_hooks.c:80
 slab_alloc_node mm/slub.c:2801 [inline]
 __kmalloc_node_track_caller+0xb40/0x1200 mm/slub.c:4420
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x2fd/0xac0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1081 [inline]
 netlink_alloc_large_skb net/netlink/af_netlink.c:1175 [inline]
 netlink_sendmsg+0x7d3/0x14d0 net/netlink/af_netlink.c:1893
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 ____sys_sendmsg+0x12b6/0x1350 net/socket.c:2345
 ___sys_sendmsg net/socket.c:2399 [inline]
 __sys_sendmsg+0x451/0x5f0 net/socket.c:2432
 __do_sys_sendmsg net/socket.c:2441 [inline]
 __se_sys_sendmsg+0x97/0xb0 net/socket.c:2439
 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2439
 do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
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