syzbot


KCSAN: data-race in __se_sys_io_uring_register / io_sqe_files_unregister

Status: auto-obsoleted due to no activity on 2023/04/12 02:11
Subsystems: io-uring
[Documentation on labels]
First crash: 752d, last: 752d

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

read-write to 0xffff888131be68a0 of 4 bytes by task 8244 on cpu 0:
 io_sqe_files_unregister+0x57/0xb0 io_uring/rsrc.c:814
 __io_uring_register io_uring/io_uring.c:4183 [inline]
 __do_sys_io_uring_register io_uring/io_uring.c:4343 [inline]
 __se_sys_io_uring_register+0x847/0x1040 io_uring/io_uring.c:4303
 __x64_sys_io_uring_register+0x55/0x60 io_uring/io_uring.c:4303
 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 to 0xffff888131be68a0 of 4 bytes by task 8243 on cpu 1:
 __do_sys_io_uring_register io_uring/io_uring.c:4345 [inline]
 __se_sys_io_uring_register+0xc2c/0x1040 io_uring/io_uring.c:4303
 __x64_sys_io_uring_register+0x55/0x60 io_uring/io_uring.c:4303
 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: 0x00000001 -> 0x00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8243 Comm: syz-executor.3 Not tainted 6.2.0-syzkaller-12944-ge492250d5252-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/03/01 02:03 upstream e492250d5252 95aee97a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __se_sys_io_uring_register / io_sqe_files_unregister
* Struck through repros no longer work on HEAD.