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AHgh+RrQCUxjDYXdtF61fzh1yjKTPyF/DcJyPSbJi+ryNBHoD4GdvG/2VUzUF+sJIyfpWaCGc2da2qc=@vger.kernel.org X-Gm-Message-State: AOJu0Yzgbjbad6FFZBbVmt9QNxuZ74uWYcsYXg9LHLz7HAKLo4807hh6 xG/bbsT53CWPNKZmBNqmFE3ze9BYvTprm3+aXAvnQy3FfThfyn7dW+wGi1w7oNNwFTtUPLF8jFJ eqhPFzIkb5VqEo3u0udjFV914/+3mjg5wB51GhGN5rpG1js0pfxWQrMiT78Y= Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a4a:e845:0:b0:6aa:d909:1457 with SMTP id 006d021491bc7-6ae433e58d2mr17742594eaf.36.1785853964747; Tue, 04 Aug 2026 07:32:44 -0700 (PDT) Date: Tue, 04 Aug 2026 07:32:44 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a71f80c.40259c87.584f4.04b9.GAE@google.com> Subject: [syzbot] [net?] WARNING in netdev_queue_get_dma_dev From: syzbot To: davem@davemloft.net, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 075b74841bd0 Linux 7.2-rc6 git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=176a7db9580000 kernel config: https://syzkaller.appspot.com/x/.config?x=145fa60d73086782 dashboard link: https://syzkaller.appspot.com/bug?extid=a78926bdac2adb52dc0e compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16225db9580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17bade32580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/1dc04730d019/disk-075b7484.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d76da42271f4/vmlinux-075b7484.xz kernel image: https://storage.googleapis.com/syzbot-assets/07b1cdbcbe45/bzImage-075b7484.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a78926bdac2adb52dc0e@syzkaller.appspotmail.com ------------[ cut here ]------------ RTNL: assertion failed at ./include/net/netdev_lock.h (72) WARNING: ./include/net/netdev_lock.h:72 at netdev_assert_locked_ops_compat include/net/netdev_lock.h:72 [inline], CPU#1: syz-executor223/5620 WARNING: ./include/net/netdev_lock.h:72 at netdev_queue_get_dma_dev+0x52e/0x660 net/core/netdev_queues.c:43, CPU#1: syz-executor223/5620 Modules linked in: CPU: 1 UID: 0 PID: 5620 Comm: syz-executor223 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 RIP: 0010:netdev_assert_locked_ops_compat include/net/netdev_lock.h:72 [inline] RIP: 0010:netdev_queue_get_dma_dev+0x53a/0x660 net/core/netdev_queues.c:43 Code: 89 c5 89 c6 e8 27 f7 68 f8 45 85 ed 0f 85 be fb ff ff e8 a9 fc 68 f8 48 8d 3d 12 0e 90 07 ba 48 00 00 00 48 c7 c6 a0 88 18 8d <67> 48 0f b9 3a e9 9c fb ff ff e8 87 fc 68 f8 48 8d bd 00 08 00 00 RSP: 0018:ffffc90003b47a80 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff888029874000 RCX: ffffffff89a16569 RDX: 0000000000000048 RSI: ffffffff8d1888a0 RDI: ffffffff91317390 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000000 R14: ffff88807b3f2568 R15: ffffc90003b47be0 FS: 00005555885ac400(0000) GS:ffff888123ed8000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000001000 CR3: 000000006f8b6000 CR4: 00000000003526f0 Call Trace: zcrx_register_netdev io_uring/zcrx.c:831 [inline] io_register_zcrx+0xe94/0x1d30 io_uring/zcrx.c:983 __io_uring_register io_uring/register.c:942 [inline] __do_sys_io_uring_register+0x1193/0x1bc0 io_uring/register.c:1040 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd0b54bbcb9 Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 d8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe25f0a7f8 EFLAGS: 00000246 ORIG_RAX: 00000000000001ab RAX: ffffffffffffffda RBX: 00007ffe25f0a928 RCX: 00007fd0b54bbcb9 RDX: 0000200000000400 RSI: 0000000000000020 RDI: 0000000000000003 RBP: 0000000000000001 R08: 0000000000000000 R09: 00007ffe25f0a928 R10: 0000000000000001 R11: 0000000000000246 R12: 00007ffe25f0a918 R13: 0000000000000002 R14: 00007fd0b554cca0 R15: 0000000000000002 ---------------- Code disassembly (best guess): 0: 89 c5 mov %eax,%ebp 2: 89 c6 mov %eax,%esi 4: e8 27 f7 68 f8 call 0xf868f730 9: 45 85 ed test %r13d,%r13d c: 0f 85 be fb ff ff jne 0xfffffbd0 12: e8 a9 fc 68 f8 call 0xf868fcc0 17: 48 8d 3d 12 0e 90 07 lea 0x7900e12(%rip),%rdi # 0x7900e30 1e: ba 48 00 00 00 mov $0x48,%edx 23: 48 c7 c6 a0 88 18 8d mov $0xffffffff8d1888a0,%rsi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: e9 9c fb ff ff jmp 0xfffffbd0 34: e8 87 fc 68 f8 call 0xf868fcc0 39: 48 8d bd 00 08 00 00 lea 0x800(%rbp),%rdi --- 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