Hello, syzbot found the following issue on: HEAD commit: 150b567e0d57 Merge tag 'net-6.13-rc3' of git://git.kernel... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1013cd44580000 kernel config: https://syzkaller.appspot.com/x/.config?x=1fe4854f351e948c dashboard link: https://syzkaller.appspot.com/bug?extid=a697a4754324488bacd7 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/05e47d657c7d/disk-150b567e.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/568329a94d6e/vmlinux-150b567e.xz kernel image: https://storage.googleapis.com/syzbot-assets/eab7b6a3d180/bzImage-150b567e.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a697a4754324488bacd7@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KCSAN: data-race in io_recv / io_wq_free_work write to 0xffff88814248b848 of 8 bytes by task 22395 on cpu 1: io_recv+0x661/0xa70 io_issue_sqe+0x150/0xc10 io_uring/io_uring.c:1736 io_poll_issue+0x1a/0x20 io_uring/io_uring.c:1767 io_poll_check_events io_uring/poll.c:289 [inline] io_poll_task_func+0x205/0x7c0 io_uring/poll.c:316 io_handle_tw_list+0xe3/0x200 io_uring/io_uring.c:1053 tctx_task_work_run+0x6e/0x1c0 io_uring/io_uring.c:1117 tctx_task_work+0x40/0x80 io_uring/io_uring.c:1135 task_work_run+0x13a/0x1a0 kernel/task_work.c:239 io_run_task_work+0x1b1/0x200 io_uring/io_uring.h:343 io_cqring_wait io_uring/io_uring.c:2594 [inline] __do_sys_io_uring_enter io_uring/io_uring.c:3434 [inline] __se_sys_io_uring_enter+0x14f5/0x1ba0 io_uring/io_uring.c:3325 __x64_sys_io_uring_enter+0x78/0x90 io_uring/io_uring.c:3325 x64_sys_call+0xb5e/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:427 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 0xffff88814248b848 of 8 bytes by task 22396 on cpu 0: req_ref_put_and_test io_uring/refs.h:22 [inline] io_wq_free_work+0x24/0x1b0 io_uring/io_uring.c:1776 io_worker_handle_work+0x4cb/0x9d0 io_uring/io-wq.c:604 io_wq_worker+0x286/0x820 io_uring/io-wq.c:655 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: 0x0000000085584038 -> 0x0000000085184138 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 22396 Comm: iou-wrk-22395 Not tainted 6.13.0-rc2-syzkaller-00130-g150b567e0d57 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 ================================================================== --- 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
