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KCSAN: data-race in udpv6_sendmsg / udpv6_sendmsg (4)

Status: auto-closed as invalid on 2021/09/03 03:58
Subsystems: net
[Documentation on labels]
First crash: 1022d, last: 1022d
Similar bugs (5)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in udpv6_sendmsg / udpv6_sendmsg net 1 1364d 1364d 0/26 auto-closed as invalid on 2020/08/23 02:37
upstream KCSAN: data-race in udpv6_sendmsg / udpv6_sendmsg (3) net 1 1077d 1077d 0/26 auto-closed as invalid on 2021/06/05 06:06
upstream KCSAN: data-race in udpv6_sendmsg / udpv6_sendmsg (6) net 1 95d 91d 26/26 fixed on 2024/01/30 15:47
upstream KCSAN: data-race in udpv6_sendmsg / udpv6_sendmsg (5) net 1 327d 327d 0/26 auto-obsoleted due to no activity on 2023/06/26 01:26
upstream KCSAN: data-race in udpv6_sendmsg / udpv6_sendmsg (2) net 1 1316d 1316d 0/26 auto-closed as invalid on 2020/10/10 02:50

Sample crash report:
==================================================================
BUG: KCSAN: data-race in udpv6_sendmsg / udpv6_sendmsg

write to 0xffff888136d5fdf0 of 4 bytes by task 7819 on cpu 0:
 udpv6_sendmsg+0x15bc/0x16b0 net/ipv6/udp.c:1548
 inet6_sendmsg+0x5f/0x80 net/ipv6/af_inet6.c:642
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg net/socket.c:674 [inline]
 ____sys_sendmsg+0x360/0x4d0 net/socket.c:2337
 ___sys_sendmsg net/socket.c:2391 [inline]
 __sys_sendmmsg+0x315/0x4b0 net/socket.c:2477
 __do_sys_sendmmsg net/socket.c:2506 [inline]
 __se_sys_sendmmsg net/socket.c:2503 [inline]
 __x64_sys_sendmmsg+0x53/0x60 net/socket.c:2503
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888136d5fdf0 of 4 bytes by task 7821 on cpu 1:
 udpv6_sendmsg+0x201/0x16b0 net/ipv6/udp.c:1328
 inet6_sendmsg+0x5f/0x80 net/ipv6/af_inet6.c:642
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg net/socket.c:674 [inline]
 ____sys_sendmsg+0x360/0x4d0 net/socket.c:2337
 ___sys_sendmsg net/socket.c:2391 [inline]
 __sys_sendmmsg+0x315/0x4b0 net/socket.c:2477
 __do_sys_sendmmsg net/socket.c:2506 [inline]
 __se_sys_sendmmsg net/socket.c:2503 [inline]
 __x64_sys_sendmmsg+0x53/0x60 net/socket.c:2503
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000000 -> 0x0000000a

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 7821 Comm: syz-executor.5 Not tainted 5.13.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/06/25 20:05 upstream 44db63d1ad8d ae6bf8dd .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in udpv6_sendmsg / udpv6_sendmsg
* Struck through repros no longer work on HEAD.