Hello, syzbot found the following issue on: HEAD commit: 2ccbdf43d5e7 Merge tag 'for-linus' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1408060e980000 kernel config: https://syzkaller.appspot.com/x/.config?x=68336ea4b6f4fc09 dashboard link: https://syzkaller.appspot.com/bug?extid=90b0e38244e035ec327c compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/26ed33651516/disk-2ccbdf43.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/3c0b763ac146/vmlinux-2ccbdf43.xz kernel image: https://storage.googleapis.com/syzbot-assets/be99b90037ed/bzImage-2ccbdf43.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+90b0e38244e035ec327c@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KCSAN: data-race in io_worker_handle_work / io_wq_worker_cancel read-write to 0xffff8881070473d8 of 4 bytes by task 24619 on cpu 0: __io_wq_worker_cancel io_uring/io-wq.c:993 [inline] io_wq_worker_cancel+0x70/0x140 io_uring/io-wq.c:1010 io_wq_for_each_worker+0x116/0x200 io_uring/io-wq.c:874 io_wq_cancel_running_work io_uring/io-wq.c:1080 [inline] io_wq_cancel_cb+0x10d/0x190 io_uring/io-wq.c:1111 io_async_cancel_one io_uring/cancel.c:87 [inline] __io_async_cancel+0x176/0x270 io_uring/cancel.c:187 __io_sync_cancel io_uring/cancel.c:261 [inline] io_sync_cancel+0x5a6/0x6d0 io_uring/cancel.c:325 __io_uring_register io_uring/register.c:543 [inline] __do_sys_io_uring_register io_uring/register.c:616 [inline] __se_sys_io_uring_register+0x504/0x1190 io_uring/register.c:577 __x64_sys_io_uring_register+0x55/0x70 io_uring/register.c:577 x64_sys_call+0x2c2/0x2d70 arch/x86/include/generated/asm/syscalls_64.h:428 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff8881070473d8 of 4 bytes by task 24621 on cpu 1: io_get_work_hash io_uring/io-wq.c:454 [inline] io_worker_handle_work+0x41a/0x9a0 io_uring/io-wq.c:591 io_wq_worker+0x286/0x820 io_uring/io-wq.c:651 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 value changed: 0x00000000 -> 0x00000001 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 24621 Comm: iou-wrk-24619 Not tainted 6.10.0-rc3-syzkaller-00044-g2ccbdf43d5e7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
