Hello, syzbot found the following issue on: HEAD commit: ac3859c02d7f block: kmsan: skip bio block merging logic fo.. git tree: https://github.com/google/kmsan.git master console+strace: https://syzkaller.appspot.com/x/log.txt?x=1394e48b080000 kernel config: https://syzkaller.appspot.com/x/.config?x=8e64bc5364a1307e dashboard link: https://syzkaller.appspot.com/bug?extid=12dde80bf174ac8ae285 compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project.git 610139d2d9ce6746b3c617fb3e2f7886272d26ff), GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12cb6983080000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17744fbd080000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+12dde80bf174ac8ae285@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================================== BUG: KMSAN: uninit-value in io_req_cqe_overflow+0x1f8/0x220 io_uring/io_uring.c:687 io_req_cqe_overflow+0x1f8/0x220 io_uring/io_uring.c:687 __io_fill_cqe_req+0x4ad/0x830 io_uring/io_uring.h:121 __io_submit_flush_completions io_uring/io_uring.c:1192 [inline] io_submit_flush_completions+0x11c/0x390 io_uring/io_uring.c:166 io_submit_state_end io_uring/io_uring.c:2025 [inline] io_submit_sqes+0x7d3/0xd50 io_uring/io_uring.c:2137 __do_sys_io_uring_enter io_uring/io_uring.c:3053 [inline] __se_sys_io_uring_enter+0x597/0x1d30 io_uring/io_uring.c:2983 __x64_sys_io_uring_enter+0x117/0x190 io_uring/io_uring.c:2983 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Uninit was stored to memory at: io_req_set_res io_uring/io_uring.h:156 [inline] io_recv_finish io_uring/net.c:537 [inline] io_recv+0x18ee/0x1d00 io_uring/net.c:845 io_issue_sqe+0x3b1/0x11d0 io_uring/io_uring.c:1576 io_queue_sqe io_uring/io_uring.c:1753 [inline] io_submit_sqe+0xb40/0x1be0 io_uring/io_uring.c:2011 io_submit_sqes+0x542/0xd50 io_uring/io_uring.c:2122 __do_sys_io_uring_enter io_uring/io_uring.c:3053 [inline] __se_sys_io_uring_enter+0x597/0x1d30 io_uring/io_uring.c:2983 __x64_sys_io_uring_enter+0x117/0x190 io_uring/io_uring.c:2983 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Local variable msg created at: io_recv+0x4b/0x1d00 io_uring/net.c:763 io_issue_sqe+0x3b1/0x11d0 io_uring/io_uring.c:1576 CPU: 0 PID: 3487 Comm: syz-executor126 Not tainted 6.0.0-rc2-syzkaller-47461-gac3859c02d7f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 ===================================================== --- 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. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
