KCSAN: data-race in rds_sendmsg / rds

ID	Workflow	Result	Correct	Bug	Created	Started	Finished	Revision	Error
bc29e69e	assessment-security	DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ✅ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌	❓	KCSAN: data-race in rds_sendmsg / rds_sendmsg (3)	2026/07/16 00:02	2026/07/16 00:02	2026/07/16 01:05	10d97020
13020ee4	assessment-kcsan	Benign: ✅	❓	KCSAN: data-race in rds_sendmsg / rds_sendmsg (3)	2026/07/14 17:09	2026/07/14 17:09	2026/07/14 17:34	2130f682

Title	Replies (including bot)	Last reply
[syzbot] [rds?] KCSAN: data-race in rds_sendmsg / rds_sendmsg (3)	0 (1)	2026/07/16 16:50

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[syzbot] [rds?] KCSAN: data-race in rds_sendmsg / rds_sendmsg (3)

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2026/07/16 16:50

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in rds_sendmsg / rds_sendmsg rds	6				4	961d	1011d	0/29	auto-obsoleted due to no activity on 2024/01/11 06:36
upstream	KCSAN: data-race in rds_sendmsg / rds_sendmsg (2) rds	6				1	576d	576d	0/29	auto-obsoleted due to no activity on 2025/02/19 22:31

Rank 🛈

upstream

KCSAN: data-race in rds_sendmsg / rds_sendmsg rds

961d

1011d

0/29

auto-obsoleted due to no activity on 2024/01/11 06:36

upstream

KCSAN: data-race in rds_sendmsg / rds_sendmsg (2) rds

576d

0/29

auto-obsoleted due to no activity on 2025/02/19 22:31

================================================================== BUG: KCSAN: data-race in rds_sendmsg / rds_sendmsg write to 0xffff888101dec818 of 8 bytes by task 30904 on cpu 0: rds_sendmsg+0xc1f/0x1580 net/rds/send.c:1332 sock_sendmsg_nosec net/socket.c:775 [inline] __sock_sendmsg net/socket.c:790 [inline] ____sys_sendmsg+0x532/0x580 net/socket.c:2684 ___sys_sendmsg+0x195/0x1e0 net/socket.c:2738 __sys_sendmsg net/socket.c:2770 [inline] __do_sys_sendmsg net/socket.c:2775 [inline] __se_sys_sendmsg net/socket.c:2773 [inline] __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2773 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+0x136/0x3c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f write to 0xffff888101dec818 of 8 bytes by task 30905 on cpu 1: rds_sendmsg+0xc1f/0x1580 net/rds/send.c:1332 sock_sendmsg_nosec net/socket.c:775 [inline] __sock_sendmsg net/socket.c:790 [inline] ____sys_sendmsg+0x532/0x580 net/socket.c:2684 ___sys_sendmsg+0x195/0x1e0 net/socket.c:2738 __sys_sendmsg net/socket.c:2770 [inline] __do_sys_sendmsg net/socket.c:2775 [inline] __se_sys_sendmsg net/socket.c:2773 [inline] __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2773 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+0x136/0x3c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x0000000000000000 -> 0xffff88811b61faf0 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 30905 Comm: syz.5.5733 Tainted: G W syzkaller #0 PREEMPT(lazy) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 ================================================================== atomic_op ffff888118e74d28 conn xmit_atomic 0000000000000000

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/07/14 17:09	upstream	3b029c035b34	2130f682	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-upstream-kcsan-gce	KCSAN: data-race in rds_sendmsg / rds_sendmsg

Crashes (1):

Assets (help?)