Hello, syzbot found the following issue on: HEAD commit: 8379578b11d5 Merge tag 'for-v6.13-rc' of git://git.kernel... git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=1713fadf980000 kernel config: https://syzkaller.appspot.com/x/.config?x=f9048090d7bb0d06 dashboard link: https://syzkaller.appspot.com/bug?extid=068ff190354d2f74892f compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1360d2c4580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11278818580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/fbfb6bbe8da9/disk-8379578b.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d0d8a8059222/vmlinux-8379578b.xz kernel image: https://storage.googleapis.com/syzbot-assets/a102540c5698/bzImage-8379578b.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+068ff190354d2f74892f@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================================== BUG: KMSAN: uninit-value in io_recv_buf_select io_uring/net.c:1094 [inline] BUG: KMSAN: uninit-value in io_recv+0x930/0x1f90 io_uring/net.c:1158 io_recv_buf_select io_uring/net.c:1094 [inline] io_recv+0x930/0x1f90 io_uring/net.c:1158 io_issue_sqe+0x420/0x2130 io_uring/io_uring.c:1740 io_queue_sqe io_uring/io_uring.c:1950 [inline] io_req_task_submit+0xfa/0x1d0 io_uring/io_uring.c:1374 io_handle_tw_list+0x55f/0x5c0 io_uring/io_uring.c:1057 tctx_task_work_run+0x109/0x3e0 io_uring/io_uring.c:1121 tctx_task_work+0x6d/0xc0 io_uring/io_uring.c:1139 task_work_run+0x268/0x310 kernel/task_work.c:239 io_run_task_work+0x43a/0x4a0 io_uring/io_uring.h:343 io_cqring_wait io_uring/io_uring.c:2527 [inline] __do_sys_io_uring_enter io_uring/io_uring.c:3439 [inline] __se_sys_io_uring_enter+0x204f/0x4ce0 io_uring/io_uring.c:3330 __x64_sys_io_uring_enter+0x11f/0x1a0 io_uring/io_uring.c:3330 x64_sys_call+0xce5/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:427 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was created at: slab_post_alloc_hook mm/slub.c:4125 [inline] slab_alloc_node mm/slub.c:4168 [inline] __do_kmalloc_node mm/slub.c:4297 [inline] __kmalloc_noprof+0x923/0x1230 mm/slub.c:4310 kmalloc_noprof include/linux/slab.h:905 [inline] io_alloc_async_data+0xc0/0x220 io_uring/io_uring.c:1651 io_msg_alloc_async io_uring/net.c:175 [inline] io_recvmsg_prep_setup io_uring/net.c:750 [inline] io_recvmsg_prep+0xbe8/0x1a20 io_uring/net.c:831 io_init_req io_uring/io_uring.c:2120 [inline] io_submit_sqe io_uring/io_uring.c:2167 [inline] io_submit_sqes+0x1082/0x2f80 io_uring/io_uring.c:2322 __do_sys_io_uring_enter io_uring/io_uring.c:3395 [inline] __se_sys_io_uring_enter+0x409/0x4ce0 io_uring/io_uring.c:3330 __x64_sys_io_uring_enter+0x11f/0x1a0 io_uring/io_uring.c:3330 x64_sys_call+0xce5/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:427 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 1 UID: 0 PID: 5781 Comm: syz-executor452 Not tainted 6.13.0-rc4-syzkaller-00069-g8379578b11d5 #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 syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. 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
