Received-SPF: pass (google.com: domain of linux-kernel+bounces-104958-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.80.249 as permitted sender) client-ip=147.75.80.249;
Precedence: bulk
MIME-Version: 1.0
Date: Fri, 15 Mar 2024 15:28:15 -0700
Message-ID: <00000000000024b0820613ba8647@google.com>
Subject: [syzbot] [io-uring?] KMSAN: uninit-value in io_sendrecv_fail
From: syzbot <syzbot+f8e9a371388aa62ecab4@syzkaller.appspotmail.com>
To: asml.silence@gmail.com, axboe@kernel.dk, io-uring@vger.kernel.org, 
	linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com
Content-Type: text/plain; charset="UTF-8"

Hello,

syzbot found the following issue on:

HEAD commit:    8ede842f669b Merge tag 'rust-6.9' of https://github.com/Ru..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=138f0ad6180000
kernel config:  https://syzkaller.appspot.com/x/.config?x=a271c5dca0ff14df
dashboard link: https://syzkaller.appspot.com/bug?extid=f8e9a371388aa62ecab4
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=15b4a6fa180000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14a59799180000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/af1cd47b84ef/disk-8ede842f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/be9297712c37/vmlinux-8ede842f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/c569fb33468d/bzImage-8ede842f.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f8e9a371388aa62ecab4@syzkaller.appspotmail.com

=====================================================
BUG: KMSAN: uninit-value in io_sendrecv_fail+0x91/0x1e0 io_uring/net.c:1334
 io_sendrecv_fail+0x91/0x1e0 io_uring/net.c:1334
 io_req_defer_failed+0x3bd/0x610 io_uring/io_uring.c:1050
 io_queue_sqe_fallback+0x1e3/0x280 io_uring/io_uring.c:2126
 io_submit_fail_init+0x4e1/0x790 io_uring/io_uring.c:2304
 io_submit_sqes+0x19cd/0x2fb0 io_uring/io_uring.c:2480
 __do_sys_io_uring_enter io_uring/io_uring.c:3656 [inline]
 __se_sys_io_uring_enter+0x409/0x43e0 io_uring/io_uring.c:3591
 __x64_sys_io_uring_enter+0x11b/0x1a0 io_uring/io_uring.c:3591
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

Uninit was created at:
 __alloc_pages+0x9a6/0xe00 mm/page_alloc.c:4592
 __alloc_pages_node include/linux/gfp.h:238 [inline]
 alloc_pages_node include/linux/gfp.h:261 [inline]
 alloc_slab_page mm/slub.c:2190 [inline]
 allocate_slab mm/slub.c:2354 [inline]
 new_slab+0x2d7/0x1400 mm/slub.c:2407
 ___slab_alloc+0x16b5/0x3970 mm/slub.c:3540
 __kmem_cache_alloc_bulk mm/slub.c:4574 [inline]
 kmem_cache_alloc_bulk+0x52a/0x1440 mm/slub.c:4648
 __io_alloc_req_refill+0x248/0x780 io_uring/io_uring.c:1101
 io_alloc_req io_uring/io_uring.h:405 [inline]
 io_submit_sqes+0xaa1/0x2fb0 io_uring/io_uring.c:2469
 __do_sys_io_uring_enter io_uring/io_uring.c:3656 [inline]
 __se_sys_io_uring_enter+0x409/0x43e0 io_uring/io_uring.c:3591
 __x64_sys_io_uring_enter+0x11b/0x1a0 io_uring/io_uring.c:3591
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

CPU: 1 PID: 5021 Comm: syz-executor425 Not tainted 6.8.0-syzkaller-00648-g8ede842f669b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
=====================================================


---
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@googlegroups.com.

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