syzbot


KCSAN: data-race in udp_lib_setsockopt / udp_lib_setsockopt

Status: fixed on 2023/12/21 01:43
Subsystems: net
[Documentation on labels]
Fix commit: 882af43a0fc3 udplite: fix various data-races
First crash: 282d, last: 281d

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

read-write to 0xffff8881083603fa of 1 bytes by task 16557 on cpu 0:
 udp_lib_setsockopt+0x682/0x6c0
 udp_setsockopt+0x73/0xa0 net/ipv4/udp.c:2779
 sock_common_setsockopt+0x61/0x70 net/core/sock.c:3697
 __sys_setsockopt+0x1c9/0x230 net/socket.c:2263
 __do_sys_setsockopt net/socket.c:2274 [inline]
 __se_sys_setsockopt net/socket.c:2271 [inline]
 __x64_sys_setsockopt+0x66/0x80 net/socket.c:2271
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read-write to 0xffff8881083603fa of 1 bytes by task 16554 on cpu 1:
 udp_lib_setsockopt+0x682/0x6c0
 udp_setsockopt+0x73/0xa0 net/ipv4/udp.c:2779
 sock_common_setsockopt+0x61/0x70 net/core/sock.c:3697
 __sys_setsockopt+0x1c9/0x230 net/socket.c:2263
 __do_sys_setsockopt net/socket.c:2274 [inline]
 __se_sys_setsockopt net/socket.c:2271 [inline]
 __x64_sys_setsockopt+0x66/0x80 net/socket.c:2271
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x01 -> 0x05

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 16554 Comm: syz-executor.5 Not tainted 6.5.0-rc7-syzkaller-00004-gf7757129e3de #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
==================================================================

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/08/22 16:42 upstream f7757129e3de b81ca3f6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in udp_lib_setsockopt / udp_lib_setsockopt
2023/08/21 13:03 upstream f7757129e3de d216d8a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in udp_lib_setsockopt / udp_lib_setsockopt
* Struck through repros no longer work on HEAD.