KCSAN: data-race in __do_sys_io_uring_register / io_sqe_buffers_register (3)

Status: auto-closed as invalid on 2022/09/28 05:57
Subsystems: io-uring
[Documentation on labels]
First crash: 1448d, last: 1448d
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in __do_sys_io_uring_register / io_sqe_buffers_register (2) fs 6 1 1748d 1748d 0/29 auto-closed as invalid on 2021/12/02 04:45
upstream KCSAN: data-race in __do_sys_io_uring_register / io_sqe_buffers_register fs 6 1 1860d 1860d 0/29 auto-closed as invalid on 2021/09/03 10:33

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

read-write to 0xffff8881232758a4 of 4 bytes by task 27640 on cpu 0:
 io_sqe_buffers_register+0x3b7/0x4b0 io_uring/rsrc.c:1329
 __io_uring_register io_uring/io_uring.c:3711 [inline]
 __do_sys_io_uring_register+0x1cc/0xc10 io_uring/io_uring.c:3878
 __se_sys_io_uring_register io_uring/io_uring.c:3858 [inline]
 __x64_sys_io_uring_register+0x4f/0x60 io_uring/io_uring.c:3858
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff8881232758a4 of 4 bytes by task 27642 on cpu 1:
 __do_sys_io_uring_register+0x79a/0xc10 io_uring/io_uring.c:3880
 __se_sys_io_uring_register io_uring/io_uring.c:3858 [inline]
 __x64_sys_io_uring_register+0x4f/0x60 io_uring/io_uring.c:3858
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000000 -> 0x00000003

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 27642 Comm: syz-executor.5 Not tainted 6.0.0-rc2-syzkaller-00044-gdf0219d11b6f-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/08/24 05:50 upstream df0219d11b6f cea8b0f7 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in __do_sys_io_uring_register / io_sqe_buffers_register
* Struck through repros no longer work on HEAD.