From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f78.google.com (mail-oo1-f78.google.com [209.85.161.78]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 39DFC373BFE for ; Wed, 22 Apr 2026 07:51:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.78 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776844304; cv=none; b=Q3vPczrxHeolNL7D4/nvlZs+M257yGnSi3Q2WDAbS69JmWQp2f7ih8pmyw5N6nOi8wPAv+WdLRWztePSnB6O6wAso/uHQSGv9t55eP4XnPTHyWPaPKQxKzbFl1ugSAfTlZHGh6UDfxR0evpXLY6Sz4Cn5IMVn7J81+XBPbPXKeY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776844304; c=relaxed/simple; bh=uz50e6kKi+gecwJeLSmSi5WIe28Q/cThNyzOT4OhYug=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=dXP3+vMQdWf462Vt13RuyNVhXvorWUYY/C3azO0rvqZJ7JKxSyWg/Spre2yf2aVKHmCHazJfbsIYvkFsFX4zbqOxcSMB/40kjzhTsXJ2GCfK4TTRqaQJAWVqEOI2yK01k1F6x+ZwnqdlAt1dca4RdXv0P8aUzoAprui0mV2VdW8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.161.78 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-oo1-f78.google.com with SMTP id 006d021491bc7-695aebf3cc7so82044eaf.0 for ; Wed, 22 Apr 2026 00:51:43 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1776844302; x=1777449102; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=ZmKoKlOtq5xFYibPDAhkTBUfGvIp8mpKFDyfn2VXSqo=; b=dR+wJWlM0AHRJt/lgDnDT1ZusKmS7QCz+qnM/O3IYJaWSzhAVnvyeX3D6MtI1camSH EDNACyM6SUIrZLSDsJTaHbRfSUwSWtnqzNayWvY2IATe58UYl5FJzqFcdiKAntiz1Rxo DBv2mlqc++oldIiTfyl3xZGgd6luPjK8+j2n0KteZF7OQXWffrK8N4/nTpAnsFaxF85/ 86RkxUlx9spaErWHc6XIIlOB1Mk+LgiEvCkHDqppqSbg3i8A4nxiahfW1S3/LpFL6ZwW seJvIw8mCd6MJe7r/kutK8GTU90YFfv4bdqIQ1MbF76vxSqcFYwXhLE37OSY4yFEItto Z0ww== X-Forwarded-Encrypted: i=1; AFNElJ/ttN7nyTdG7e2Zp3/WiCzCt8CkrK0UAEQT96YxfsAobL+BdDR0CH5SqA8V4Tg/ZtQSbDGkbr4=@vger.kernel.org X-Gm-Message-State: AOJu0Yy2zt48bzsfigcp2ZCwsAjwS+HYoOTbEVmwWH8vYCp02Aquc6eK CBcqvHiAzORYQNHoYcao0KThJXOv/pOvsIbFJrW2GPclOGQV/wC3QfHXYNq1Z2gHXmYyzgA6w1D Ztlo2KXUUic0vNVHYUBJF/JvMskhaFH2Rh7CVcCWwb8p1P42Tb4y85RGMV/o= Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1743:b0:685:d435:1471 with SMTP id 006d021491bc7-69462e21d8cmr11582809eaf.10.1776844302197; Wed, 22 Apr 2026 00:51:42 -0700 (PDT) Date: Wed, 22 Apr 2026 00:51:42 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69e87e0e.a00a0220.9259.001b.GAE@google.com> Subject: [syzbot] [atm?] general protection fault in atmtcp_ioctl From: syzbot To: 3chas3@gmail.com, linux-atm-general@lists.sourceforge.net, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 1f5ffc672165 Fix mismerge of the arm64 / timer-core interr.. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=14b72c36580000 kernel config: https://syzkaller.appspot.com/x/.config?x=95729ed00549063a dashboard link: https://syzkaller.appspot.com/bug?extid=52bbaea57234493b6b17 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/6b552538b97f/disk-1f5ffc67.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/724a3a1d69d7/vmlinux-1f5ffc67.xz kernel image: https://storage.googleapis.com/syzbot-assets/ea684969e2c2/bzImage-1f5ffc67.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+52bbaea57234493b6b17@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 UID: 0 PID: 15453 Comm: syz.2.2407 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:atmtcp_attach drivers/atm/atmtcp.c:408 [inline] RIP: 0010:atmtcp_ioctl+0x860/0xdf0 drivers/atm/atmtcp.c:477 Code: ff e9 b4 fb ff ff 4c 8d 63 20 4c 89 e0 48 c1 e8 03 80 3c 28 00 74 08 4c 89 e7 e8 cb 21 0b fb 4d 8b 24 24 4c 89 e0 48 c1 e8 03 <80> 3c 28 00 74 08 4c 89 e7 e8 b2 21 0b fb 49 83 3c 24 00 0f 84 f0 RSP: 0018:ffffc9000f6b7c30 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888037f2f000 RCX: ffffffff8bb4829e RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffc9000f6b7b80 RBP: dffffc0000000000 R08: ffffc9000f6b7b87 R09: 1ffff92001ed6f70 R10: dffffc0000000000 R11: fffff52001ed6f71 R12: 0000000000000000 R13: 1ffff11006fe5e00 R14: ffff88808ac0d440 R15: ffff88803234e000 FS: 00007fd42b7c26c0(0000) GS:ffff888125345000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000001944 CR3: 00000000358e6000 CR4: 00000000003526f0 Call Trace: do_vcc_ioctl+0x36d/0x9d0 net/atm/ioctl.c:159 sock_do_ioctl+0x101/0x320 net/socket.c:1313 sock_ioctl+0x5c6/0x7f0 net/socket.c:1434 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd42a99c819 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fd42b7c2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fd42ac15fa0 RCX: 00007fd42a99c819 RDX: 0000000000000000 RSI: 0000000000006180 RDI: 0000000000000008 RBP: 00007fd42aa32c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd42ac16038 R14: 00007fd42ac15fa0 R15: 00007ffe8b9d1618 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:atmtcp_attach drivers/atm/atmtcp.c:408 [inline] RIP: 0010:atmtcp_ioctl+0x860/0xdf0 drivers/atm/atmtcp.c:477 Code: ff e9 b4 fb ff ff 4c 8d 63 20 4c 89 e0 48 c1 e8 03 80 3c 28 00 74 08 4c 89 e7 e8 cb 21 0b fb 4d 8b 24 24 4c 89 e0 48 c1 e8 03 <80> 3c 28 00 74 08 4c 89 e7 e8 b2 21 0b fb 49 83 3c 24 00 0f 84 f0 RSP: 0018:ffffc9000f6b7c30 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888037f2f000 RCX: ffffffff8bb4829e RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffc9000f6b7b80 RBP: dffffc0000000000 R08: ffffc9000f6b7b87 R09: 1ffff92001ed6f70 R10: dffffc0000000000 R11: fffff52001ed6f71 R12: 0000000000000000 R13: 1ffff11006fe5e00 R14: ffff88808ac0d440 R15: ffff88803234e000 FS: 00007fd42b7c26c0(0000) GS:ffff888125345000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c3d9593 CR3: 00000000358e6000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: ff ljmp (bad) 1: e9 b4 fb ff ff jmp 0xfffffbba 6: 4c 8d 63 20 lea 0x20(%rbx),%r12 a: 4c 89 e0 mov %r12,%rax d: 48 c1 e8 03 shr $0x3,%rax 11: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) 15: 74 08 je 0x1f 17: 4c 89 e7 mov %r12,%rdi 1a: e8 cb 21 0b fb call 0xfb0b21ea 1f: 4d 8b 24 24 mov (%r12),%r12 23: 4c 89 e0 mov %r12,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 e7 mov %r12,%rdi 33: e8 b2 21 0b fb call 0xfb0b21ea 38: 49 83 3c 24 00 cmpq $0x0,(%r12) 3d: 0f .byte 0xf 3e: 84 f0 test %dh,%al --- 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 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