KCSAN: data-race in ip6_dst_gc / ip6_dst

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in ip6_dst_gc / ip6_dst_gc (3) net	6				2	1196d	1199d	22/29	fixed on 2023/02/24 13:50
upstream	KCSAN: data-race in ip6_dst_gc / ip6_dst_gc net	6				12	1960d	2086d	0/29	auto-closed as invalid on 2020/05/21 16:42

================================================================== BUG: KCSAN: data-race in ip6_dst_gc / ip6_dst_gc read-write to 0xffff88813784498c of 4 bytes by task 9264 on cpu 1: ip6_dst_gc+0x1dd/0x210 net/ipv6/route.c:3218 dst_alloc+0xa2/0x2c0 net/core/dst.c:87 ip6_dst_alloc net/ipv6/route.c:356 [inline] ip6_rt_cache_alloc+0x210/0x5c0 net/ipv6/route.c:1346 ip6_pol_route+0xbe8/0xd60 net/ipv6/route.c:2246 ip6_pol_route_output+0x3b/0x50 net/ipv6/route.c:2478 pol_lookup_func include/net/ip6_fib.h:583 [inline] fib6_rule_lookup+0xef/0x320 net/ipv6/fib6_rules.c:115 ip6_route_output_flags_noref+0x1e3/0x200 net/ipv6/route.c:2510 ip6_route_output_flags+0x2f/0x150 net/ipv6/route.c:2523 ip6_dst_lookup_tail+0xf0/0x9b0 net/ipv6/ip6_output.c:1090 ip6_dst_lookup_flow+0x44/0xc0 net/ipv6/ip6_output.c:1193 rawv6_sendmsg+0xbc2/0x1320 net/ipv6/raw.c:928 inet_sendmsg+0x5f/0x80 net/ipv4/af_inet.c:817 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0x352/0x4c0 net/socket.c:2345 ___sys_sendmsg net/socket.c:2399 [inline] __sys_sendmmsg+0x335/0x4b0 net/socket.c:2489 __do_sys_sendmmsg net/socket.c:2518 [inline] __se_sys_sendmmsg net/socket.c:2515 [inline] __x64_sys_sendmmsg+0x53/0x60 net/socket.c:2515 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read-write to 0xffff88813784498c of 4 bytes by task 9269 on cpu 0: ip6_dst_gc+0x1dd/0x210 net/ipv6/route.c:3218 dst_alloc+0xa2/0x2c0 net/core/dst.c:87 ip6_dst_alloc net/ipv6/route.c:356 [inline] ip6_rt_cache_alloc+0x210/0x5c0 net/ipv6/route.c:1346 ip6_pol_route+0xbe8/0xd60 net/ipv6/route.c:2246 ip6_pol_route_output+0x3b/0x50 net/ipv6/route.c:2478 pol_lookup_func include/net/ip6_fib.h:583 [inline] fib6_rule_lookup+0xef/0x320 net/ipv6/fib6_rules.c:115 ip6_route_output_flags_noref+0x1e3/0x200 net/ipv6/route.c:2510 ip6_route_output_flags+0x2f/0x150 net/ipv6/route.c:2523 ip6_dst_lookup_tail+0xf0/0x9b0 net/ipv6/ip6_output.c:1090 ip6_dst_lookup_flow+0x44/0xc0 net/ipv6/ip6_output.c:1193 rawv6_sendmsg+0xbc2/0x1320 net/ipv6/raw.c:928 inet_sendmsg+0x5f/0x80 net/ipv4/af_inet.c:817 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0x352/0x4c0 net/socket.c:2345 ___sys_sendmsg net/socket.c:2399 [inline] __sys_sendmmsg+0x335/0x4b0 net/socket.c:2489 __do_sys_sendmmsg net/socket.c:2518 [inline] __se_sys_sendmmsg net/socket.c:2515 [inline] __x64_sys_sendmmsg+0x53/0x60 net/socket.c:2515 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: 0 PID: 9269 Comm: syz-executor.2 Not tainted 5.11.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================