KCSAN: data-race in macsec_start_xmit / macsec_start

KCSAN: data-race in macsec_start_xmit / macsec_start_xmit
Status: auto-closed as invalid on 2021/04/27 11:17
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 129d, last: 129d

Sample crash report:

==================================================================
BUG: KCSAN: data-race in macsec_start_xmit / macsec_start_xmit

write to 0xffff8880263c9160 of 8 bytes by task 3293 on cpu 1:
 macsec_start_xmit+0x2a6/0x1430 drivers/net/macsec.c:3399
 __netdev_start_xmit include/linux/netdevice.h:4823 [inline]
 netdev_start_xmit include/linux/netdevice.h:4837 [inline]
 xmit_one+0xf9/0x2e0 net/core/dev.c:3593
 dev_hard_start_xmit net/core/dev.c:3609 [inline]
 __dev_queue_xmit+0xf22/0x1580 net/core/dev.c:4182
 dev_queue_xmit+0x13/0x20 net/core/dev.c:4215
 neigh_hh_output include/net/neighbour.h:499 [inline]
 neigh_output include/net/neighbour.h:508 [inline]
 ip_finish_output2+0xb07/0xba0 net/ipv4/ip_output.c:230
 __ip_finish_output+0x2f9/0x490 net/ipv4/ip_output.c:252
 ip_finish_output+0x39/0x160 net/ipv4/ip_output.c:318
 NF_HOOK_COND include/linux/netfilter.h:290 [inline]
 ip_mc_output+0x304/0x4d0 net/ipv4/ip_output.c:417
 dst_output include/net/dst.h:448 [inline]
 ip_local_out net/ipv4/ip_output.c:126 [inline]
 ip_send_skb+0x6e/0xe0 net/ipv4/ip_output.c:1568
 udp_send_skb+0x62d/0x860 net/ipv4/udp.c:953
 udp_sendmsg+0x12b0/0x1560 net/ipv4/udp.c:1240
 inet_sendmsg+0x5f/0x80 net/ipv4/af_inet.c:821
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg net/socket.c:674 [inline]
 ____sys_sendmsg+0x360/0x4d0 net/socket.c:2350
 ___sys_sendmsg net/socket.c:2404 [inline]
 __sys_sendmmsg+0x315/0x4b0 net/socket.c:2490
 __do_sys_sendmmsg net/socket.c:2519 [inline]
 __se_sys_sendmmsg net/socket.c:2516 [inline]
 __x64_sys_sendmmsg+0x53/0x60 net/socket.c:2516
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8880263c9160 of 8 bytes by task 3301 on cpu 0:
 macsec_start_xmit+0x294/0x1430 drivers/net/macsec.c:3399
 __netdev_start_xmit include/linux/netdevice.h:4823 [inline]
 netdev_start_xmit include/linux/netdevice.h:4837 [inline]
 xmit_one+0xf9/0x2e0 net/core/dev.c:3593
 dev_hard_start_xmit net/core/dev.c:3609 [inline]
 __dev_queue_xmit+0xf22/0x1580 net/core/dev.c:4182
 dev_queue_xmit+0x13/0x20 net/core/dev.c:4215
 neigh_hh_output include/net/neighbour.h:499 [inline]
 neigh_output include/net/neighbour.h:508 [inline]
 ip_finish_output2+0xb07/0xba0 net/ipv4/ip_output.c:230
 __ip_finish_output+0x2f9/0x490 net/ipv4/ip_output.c:252
 ip_finish_output+0x39/0x160 net/ipv4/ip_output.c:318
 NF_HOOK_COND include/linux/netfilter.h:290 [inline]
 ip_mc_output+0x304/0x4d0 net/ipv4/ip_output.c:417
 dst_output include/net/dst.h:448 [inline]
 ip_local_out net/ipv4/ip_output.c:126 [inline]
 ip_send_skb+0x6e/0xe0 net/ipv4/ip_output.c:1568
 udp_send_skb+0x62d/0x860 net/ipv4/udp.c:953
 udp_sendmsg+0x12b0/0x1560 net/ipv4/udp.c:1240
 inet_sendmsg+0x5f/0x80 net/ipv4/af_inet.c:821
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg net/socket.c:674 [inline]
 ____sys_sendmsg+0x360/0x4d0 net/socket.c:2350
 ___sys_sendmsg net/socket.c:2404 [inline]
 __sys_sendmmsg+0x315/0x4b0 net/socket.c:2490
 __do_sys_sendmmsg net/socket.c:2519 [inline]
 __se_sys_sendmmsg net/socket.c:2516 [inline]
 __x64_sys_sendmmsg+0x53/0x60 net/socket.c:2516
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3301 Comm: syz-executor.5 Tainted: G        W         5.12.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (1):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci2-upstream-kcsan-gce	2021/03/23 11:10	upstream	84196390620a	8092f30d	.config	log	report			info	KCSAN: data-race in macsec_start_xmit / macsec_start_xmit