KCSAN: data-race in __nf_conntrack_alloc / gc

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in __nf_conntrack_alloc / gc_worker netfilter				1	1324d	1324d	0/26	auto-closed as invalid on 2020/10/14 23:41

================================================================== BUG: KCSAN: data-race in __nf_conntrack_alloc / gc_worker write to 0xffff88802c2b3b08 of 4 bytes by task 13019 on cpu 1: __nf_conntrack_alloc+0x147/0x270 net/netfilter/nf_conntrack_core.c:1508 init_conntrack+0x178/0xa90 net/netfilter/nf_conntrack_core.c:1576 resolve_normal_ct net/netfilter/nf_conntrack_core.c:1674 [inline] nf_conntrack_in+0x37f/0xad4 net/netfilter/nf_conntrack_core.c:1829 ipv4_conntrack_local+0xc2/0x120 net/netfilter/nf_conntrack_proto.c:200 nf_hook_entry_hookfn include/linux/netfilter.h:136 [inline] nf_hook_slow+0x72/0x170 net/netfilter/core.c:589 nf_hook include/linux/netfilter.h:256 [inline] __ip_local_out+0x282/0x2a0 net/ipv4/ip_output.c:115 ip_local_out net/ipv4/ip_output.c:124 [inline] __ip_queue_xmit+0x98d/0x9f0 net/ipv4/ip_output.c:532 ip_queue_xmit+0x34/0x40 net/ipv4/ip_output.c:546 __tcp_transmit_skb+0x1250/0x1860 net/ipv4/tcp_output.c:1404 tcp_transmit_skb net/ipv4/tcp_output.c:1422 [inline] tcp_connect+0x56a/0xff0 net/ipv4/tcp_output.c:3849 tcp_v4_connect+0xac7/0xba0 net/ipv4/tcp_ipv4.c:312 __inet_stream_connect+0x586/0x690 net/ipv4/af_inet.c:661 inet_stream_connect+0x44/0x70 net/ipv4/af_inet.c:725 rds_tcp_conn_path_connect+0x360/0x430 net/rds/tcp_connect.c:172 rds_connect_worker+0x125/0x1a0 net/rds/threads.c:176 process_one_work+0x3e1/0x950 kernel/workqueue.c:2272 worker_thread+0x635/0xb90 kernel/workqueue.c:2418 kthread+0x1fa/0x220 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 read to 0xffff88802c2b3b08 of 4 bytes by task 29212 on cpu 0: gc_worker+0x240/0x870 arch/x86/include/asm/bitops.h:207 process_one_work+0x3e1/0x950 kernel/workqueue.c:2272 worker_thread+0x635/0xb90 kernel/workqueue.c:2418 kthread+0x1fa/0x220 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 29212 Comm: kworker/0:3 Not tainted 5.10.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_power_efficient gc_worker ==================================================================