Hello, syzbot found the following issue on: HEAD commit: 99d99825fc07 Merge tag 'nfs-for-6.6-1' of git://git.linux-.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=10c292a8680000 kernel config: https://syzkaller.appspot.com/x/.config?x=e9fadcd263e8d242 dashboard link: https://syzkaller.appspot.com/bug?extid=8d9c06e026c513a69f2f 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=1358d7dfa80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14c99d9fa80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/7e9fa7fad7d0/disk-99d99825.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/424ca21fc443/vmlinux-99d99825.xz kernel image: https://storage.googleapis.com/syzbot-assets/d4de08b26e5b/bzImage-99d99825.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+8d9c06e026c513a69f2f@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================================== BUG: KMSAN: uninit-value in io_fixup_rw_res io_uring/rw.c:273 [inline] BUG: KMSAN: uninit-value in io_rw_fail+0x1a7/0x1b0 io_uring/rw.c:996 io_fixup_rw_res io_uring/rw.c:273 [inline] io_rw_fail+0x1a7/0x1b0 io_uring/rw.c:996 io_req_defer_failed+0x217/0x3e0 io_uring/io_uring.c:1030 io_queue_sqe_fallback+0x1f4/0x260 io_uring/io_uring.c:2063 io_submit_state_end io_uring/io_uring.c:2308 [inline] io_submit_sqes+0x2b83/0x2ff0 io_uring/io_uring.c:2426 __do_sys_io_uring_enter io_uring/io_uring.c:3620 [inline] __se_sys_io_uring_enter+0x491/0x43f0 io_uring/io_uring.c:3554 __x64_sys_io_uring_enter+0x11b/0x1a0 io_uring/io_uring.c:3554 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 Uninit was created at: slab_post_alloc_hook+0x12f/0xb70 mm/slab.h:767 slab_alloc_node mm/slub.c:3478 [inline] __kmem_cache_alloc_node+0x536/0x8d0 mm/slub.c:3517 __do_kmalloc_node mm/slab_common.c:1022 [inline] __kmalloc+0x121/0x3c0 mm/slab_common.c:1036 kmalloc include/linux/slab.h:603 [inline] io_alloc_async_data io_uring/io_uring.c:1745 [inline] io_req_prep_async+0x384/0x5a0 io_uring/io_uring.c:1766 io_queue_sqe_fallback+0x95/0x260 io_uring/io_uring.c:2060 io_submit_state_end io_uring/io_uring.c:2308 [inline] io_submit_sqes+0x2b83/0x2ff0 io_uring/io_uring.c:2426 __do_sys_io_uring_enter io_uring/io_uring.c:3620 [inline] __se_sys_io_uring_enter+0x491/0x43f0 io_uring/io_uring.c:3554 __x64_sys_io_uring_enter+0x11b/0x1a0 io_uring/io_uring.c:3554 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 CPU: 0 PID: 4988 Comm: syz-executor352 Not tainted 6.5.0-syzkaller-09276-g99d99825fc07 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 ===================================================== --- 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
