From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0CAB943A7F3; Tue, 4 Aug 2026 21:00:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785877209; cv=none; b=jqVOi8H+h6jHsTLlfqgJV+iOpkwj+NnSGtq3WKwS5Ab3Nw5QlyQfKb050pFHbMg8McdLcQawYDtZnQ9wclxRSybX0KycX5+d+H/Bov71bP8KggdrTx4YBp6kuPu6w7JG1E4Pxd29Vv5XKj/IHVM9MzsdZgHa9PTFY55aOaklJhs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785877209; c=relaxed/simple; bh=1DjlGMxzCYwJpQfkxictaP2MlWvY7NAtfDrE0KWhpSk=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=du0c+FWGe8+U89pjnwGRyDBRbwlqxasgHYbPSYaj2JqRkgDue2gqJZvKqRjKD0p/5e0OuZ0Z3TRUITYh68EDnO1DaDNJ9h212XK87lADydkdN77CbZe8lgPFj5dQqb6cOMmpz9EdxWT9kPnTlEH5lwOqiOVrJBthddt4h2ZQYJ4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=gCt9KCiw; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="gCt9KCiw" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 615B11F00A3A; Tue, 4 Aug 2026 21:00:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785877207; bh=rC8FDbIMWTB39WKOKXiFLlVQC87F9uT7a0Abtcke7nI=; h=Date:From:To:Cc:Subject:In-Reply-To:References; b=gCt9KCiwaiOfPJNSnfCSxC3tOuiP3oOj2zTekaQB1CHSHYi5ddlDU9cUgLgYSMj03 20xO7MFkQDa/HD6YzaWfFHq61APux+WjfNwt9OHBQUMrGlE9gB9ES/3pfUbKEFw/CC CXGRMkE8HLFgpVOq43MSbhlayCHRhaxi3XamoKfrEe+5ARdPU0tt2p40nxZTZA59Zr dgMGZGxXc90Z5tdBgIRIjcS1/WLALR7Iv/gD6GTpnK371NFzRzqglq0Ne39m+sWfw1 rxcYMKT7AypDji8IibTKeueATb2cRCnbM2MBd7hqKbxy/9az8p92pTfnPXDEcM14hn 7nQHCh191Rvwg== Date: Tue, 4 Aug 2026 14:00:06 -0700 From: Jakub Kicinski To: Pavel Begunkov Cc: syzbot , davem@davemloft.net, edumazet@google.com, horms@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [net?] WARNING in netdev_queue_get_dma_dev Message-ID: <20260804140006.0210f6ca@kernel.org> In-Reply-To: <6a71f80c.40259c87.584f4.04b9.GAE@google.com> References: <6a71f80c.40259c87.584f4.04b9.GAE@google.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Hi Pavel, could you TAL? On Tue, 04 Aug 2026 07:32:44 -0700 syzbot wrote: > 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