Hello, syzbot found the following issue on: HEAD commit: 9f8413c4a66f Merge tag 'cgroup-for-6.8' of git://git.kerne.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1743d3e4180000 kernel config: https://syzkaller.appspot.com/x/.config?x=656820e61b758b15 dashboard link: https://syzkaller.appspot.com/bug?extid=0198afa90d8c29ef9557 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/79d9f2f4b065/disk-9f8413c4.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/cbc68430d9c6/vmlinux-9f8413c4.xz kernel image: https://storage.googleapis.com/syzbot-assets/9740ad9fc172/bzImage-9f8413c4.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+0198afa90d8c29ef9557@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================================== BUG: KMSAN: uninit-value in io_fixup_rw_res io_uring/rw.c:311 [inline] BUG: KMSAN: uninit-value in io_rw_fail+0x1a7/0x1b0 io_uring/rw.c:1099 io_fixup_rw_res io_uring/rw.c:311 [inline] io_rw_fail+0x1a7/0x1b0 io_uring/rw.c:1099 io_req_defer_failed+0x217/0x3e0 io_uring/io_uring.c:1065 io_queue_sqe_fallback+0x1f4/0x260 io_uring/io_uring.c:2100 io_submit_state_end io_uring/io_uring.c:2345 [inline] io_submit_sqes+0x2b85/0x2ff0 io_uring/io_uring.c:2463 __do_sys_io_uring_enter io_uring/io_uring.c:3712 [inline] __se_sys_io_uring_enter+0x40c/0x42d0 io_uring/io_uring.c:3647 __x64_sys_io_uring_enter+0x11b/0x1a0 io_uring/io_uring.c:3647 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x6d/0x140 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Uninit was created at: slab_post_alloc_hook+0x129/0xa70 mm/slab.h:768 slab_alloc_node mm/slub.c:3478 [inline] __kmem_cache_alloc_node+0x5c9/0x970 mm/slub.c:3517 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc+0x121/0x3c0 mm/slab_common.c:1020 kmalloc include/linux/slab.h:604 [inline] io_alloc_async_data io_uring/io_uring.c:1780 [inline] io_req_prep_async+0x384/0x5a0 io_uring/io_uring.c:1801 io_queue_sqe_fallback+0x95/0x260 io_uring/io_uring.c:2097 io_submit_state_end io_uring/io_uring.c:2345 [inline] io_submit_sqes+0x2b85/0x2ff0 io_uring/io_uring.c:2463 __do_sys_io_uring_enter io_uring/io_uring.c:3712 [inline] __se_sys_io_uring_enter+0x40c/0x42d0 io_uring/io_uring.c:3647 __x64_sys_io_uring_enter+0x11b/0x1a0 io_uring/io_uring.c:3647 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x6d/0x140 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b CPU: 0 PID: 5401 Comm: syz-executor.4 Not tainted 6.7.0-syzkaller-00562-g9f8413c4a66f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 ===================================================== --- 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
