KCSAN: data-race in hash_ip4_add / hash_ip4

ID	Workflow	Result	Correct	Bug	Created	Started	Finished	Revision
e42706a1-7628-4461-abcb-0ade5da3c6af	assessment-security	DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌	❓	KCSAN: data-race in hash_ip4_add / hash_ip4_head	2026/05/21 20:29	2026/05/21 20:29	2026/05/21 21:04	d57425845dbe663f86e1e54a4997e95bd557b624
b8baabef-9f94-421b-aa82-cea38cf2f1db	assessment-kcsan	Benign: ✅ Confident: ✅	❓	KCSAN: data-race in hash_ip4_add / hash_ip4_head	2026/03/31 12:12	2026/03/31 12:19	2026/03/31 12:53	d0af506ef4609d1bffbbbbae776b857a63d84b20
f5a842ac-3166-4d0e-b075-9cee8ef95c7e	assessment-kcsan	Benign: ✅ Confident: ✅	❓	KCSAN: data-race in hash_ip4_add / hash_ip4_head	2026/03/25 04:34	2026/03/25 04:34	2026/03/25 04:54	35e4ff71789eea23a7729acb77e387e315dcf85b

Title	Replies (including bot)	Last reply
[PATCH net 09/12] netfilter: ipset: Fix data race between add and dump in all hash types	1 (1)	2026/05/16 11:56
[PATCH v7 03/10] netfilter: ipset: Fix data race between add and dump in all hash types	1 (1)	2026/05/14 08:55
[PATCH v6 3/8] netfilter: ipset: Fix data race between add and dump in all hash types	1 (1)	2026/05/08 20:58
[PATCH 2/5] netfilter: ipset: Fix data race between add and dump in all hash types	1 (1)	2026/04/28 15:19
[PATCH 2/5] netfilter: ipset: Fix data race between add and dump in all hash types	1 (1)	2026/04/27 07:34
[PATCH 2/2] netfilter: ipset: Fix data race between add and dump in all hash types	3 (3)	2026/04/15 10:33
[PATCH 2/2] netfilter: ipset: Fix data race between add and dump in all hash types	1 (1)	2026/04/08 07:02
[syzbot] [netfilter?] KCSAN: data-race in hash_ip4_add / hash_ip4_head	0 (1)	2026/03/25 10:43

Title

Replies (including bot)

Last reply

[PATCH net 09/12] netfilter: ipset: Fix data race between add and dump in all hash types

1 (1)

2026/05/16 11:56

[PATCH v7 03/10] netfilter: ipset: Fix data race between add and dump in all hash types

1 (1)

2026/05/14 08:55

[PATCH v6 3/8] netfilter: ipset: Fix data race between add and dump in all hash types

1 (1)

2026/05/08 20:58

[PATCH 2/5] netfilter: ipset: Fix data race between add and dump in all hash types

1 (1)

2026/04/28 15:19

[PATCH 2/5] netfilter: ipset: Fix data race between add and dump in all hash types

1 (1)

2026/04/27 07:34

[PATCH 2/2] netfilter: ipset: Fix data race between add and dump in all hash types

3 (3)

2026/04/15 10:33

[PATCH 2/2] netfilter: ipset: Fix data race between add and dump in all hash types

1 (1)

2026/04/08 07:02

[syzbot] [netfilter?] KCSAN: data-race in hash_ip4_add / hash_ip4_head

0 (1)

2026/03/25 10:43

================================================================== BUG: KCSAN: data-race in hash_ip4_add / hash_ip4_head read-write to 0xffff88810e478c19 of 1 bytes by task 6489 on cpu 1: hash_ip4_add+0x703/0xf60 net/netfilter/ipset/ip_set_hash_gen.h:965 hash_ip4_uadt+0x452/0x500 net/netfilter/ipset/ip_set_hash_ip.c:160 call_ad+0x231/0x640 net/netfilter/ipset/ip_set_core.c:1751 ip_set_ad+0x5c0/0x690 net/netfilter/ipset/ip_set_core.c:1841 ip_set_uadd+0x41/0x50 net/netfilter/ipset/ip_set_core.c:1864 nfnetlink_rcv_msg+0x509/0x5d0 net/netfilter/nfnetlink.c:302 netlink_rcv_skb+0x123/0x220 net/netlink/af_netlink.c:2550 nfnetlink_rcv+0x167/0x1720 net/netfilter/nfnetlink.c:669 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x5c0/0x690 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x5c8/0x6f0 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0x563/0x5b0 net/socket.c:2592 ___sys_sendmsg+0x195/0x1e0 net/socket.c:2646 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2681 x64_sys_call+0x194c/0x3020 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff88810e478c19 of 1 bytes by task 6498 on cpu 0: hash_ip4_ext_size net/netfilter/ipset/ip_set_hash_gen.h:823 [inline] hash_ip4_head+0x283/0x950 net/netfilter/ipset/ip_set_hash_gen.h:1275 ip_set_dump_do+0xa34/0xb00 net/netfilter/ipset/ip_set_core.c:1651 netlink_dump+0x455/0x8a0 net/netlink/af_netlink.c:2325 netlink_recvmsg+0x420/0x550 net/netlink/af_netlink.c:1976 sock_recvmsg_nosec net/socket.c:1078 [inline] sock_recvmsg+0xf5/0x120 net/socket.c:1100 ____sys_recvmsg+0xf5/0x280 net/socket.c:2812 ___sys_recvmsg+0x11f/0x3b0 net/socket.c:2854 __sys_recvmsg net/socket.c:2887 [inline] __do_sys_recvmsg net/socket.c:2893 [inline] __se_sys_recvmsg net/socket.c:2890 [inline] __x64_sys_recvmsg+0xd1/0x160 net/socket.c:2890 x64_sys_call+0x2b1a/0x3020 arch/x86/include/generated/asm/syscalls_64.h:48 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x01 -> 0x02 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 6498 Comm: syz.4.620 Tainted: G W syzkaller #0 PREEMPT(full) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 ==================================================================

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/03/25 04:34	upstream	24f9515de877	74e70d19	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-upstream-kcsan-gce	KCSAN: data-race in hash_ip4_add / hash_ip4_head

Crashes (1):

Assets (help?)