From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f79.google.com (mail-ot1-f79.google.com [209.85.210.79]) (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 A259C2AD22 for ; Sat, 24 Jan 2026 06:45:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.79 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769237129; cv=none; b=Hj/FsO4sDozZ1I2aSaoxS1/d3B8WVsmYZdQIucTypI8ulCZDqEjgPlJP/SDdmGNZzq6gbgy5Tdiu6En4CKI2Te0wxYSIeiOHYIZtdSCrkXH5XejFIEs8lFdfVW84RWVTsHQYXhx8k+xGYj0fQ0eEuC934JUf/RJtgI4Wfnl2meE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769237129; c=relaxed/simple; bh=LhmEv4e+5VmVM0O6iaEyXdh29+pWPxrA66JCacz78W4=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=oScfFwzKm6o5b2u6GfMRh1KM6XzBf3JSsE0yunyMO4+V6B686f2f+fyOSVPWSKmuj1XM3/HZaDbcxjM5Q+iJWTnflBvsYAkLrU+abFWKS9R7pB0wJMCjOceXcksz9XZJ2yZ298FiVplZnRSH8SEE1SXBP18Y0987EMtakGg3bh0= 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=209.85.210.79 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-ot1-f79.google.com with SMTP id 46e09a7af769-7cfdd2f521bso4047951a34.1 for ; Fri, 23 Jan 2026 22:45:27 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1769237126; x=1769841926; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=vIVjvVq9NL5VI6F6rj8Gpzz8KhMM17ebtGseEjU5nLs=; b=dUn2EIY42gT1EpBykCXj6bAS9r+utrs8VuQOwM+rMCwy1SG2EQ3OQeu0lTfCHbMX2c eCyukn/NaZLB575bIXVfj+UDydAjwoXu5TuIi0eiDwArym4BXPUyg1gmOOzYYwCvVsTK xOsD4M7sJisl+1Btg1JjASJmeCZmPwAsTvh0Um1YqKfJFThrZRk75dYlO/JvmLm/B/PE uVtsO6Qf4Lc/ICHNUORg7L1A+mJI8dmxtLrFHsq4nxoHlncbbx/vPGKfxA4cwFFtxNky ybUyrS8OC8os8//o7e59WKf2NcogYSoiAXDf+NIDh6qsAMEsHLSO7b5z/F2elWXCx8fZ hiFg== X-Forwarded-Encrypted: i=1; AJvYcCUOfOlmAX11DGy/f1uz92FznVty2k/N6YdMC08bkCYammmSLtC5xlcJcalW1kO8/8rjrdphgN0+BnZse6w=@vger.kernel.org X-Gm-Message-State: AOJu0YzjPNefIXKfMB4BrjRO5jkT2PXdEqbcCHH2QBGWGXxiGvgUIoxY CDKfe+NiYgO1ILaG9gM7dmMJn1eB63TUdzb++tIrTw6C7UBIbQvELOqewoR2plbFzrLpRtOq/wv 2ndQsfhog44CyqNaCfSQ8i5KmThH/zPdrQ7Atr/VruCfEiVx42/ZcOhxDow8= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:4a88:b0:662:c65f:a061 with SMTP id 006d021491bc7-662caaf91cemr2194248eaf.23.1769237126618; Fri, 23 Jan 2026 22:45:26 -0800 (PST) Date: Fri, 23 Jan 2026 22:45:26 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69746a86.050a0220.226181.0003.GAE@google.com> Subject: [syzbot] [comedi?] BUG: unable to handle kernel paging request in dt2815_attach From: syzbot To: abbotti@mev.co.uk, hsweeten@visionengravers.com, 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: c072629f05d7 Merge tag 'v6.19-p4' of git://git.kernel.org/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=158b8bfa580000 kernel config: https://syzkaller.appspot.com/x/.config?x=e2e5d7c9c1e01cf4 dashboard link: https://syzkaller.appspot.com/bug?extid=72f94b474d6e50b71ffc compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10144452580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1434df9a580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-c072629f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/bd5acf0ccc3e/vmlinux-c072629f.xz kernel image: https://storage.googleapis.com/syzbot-assets/ab6178baf781/bzImage-c072629f.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+72f94b474d6e50b71ffc@syzkaller.appspotmail.com BUG: unable to handle page fault for address: fffffffffffffff0 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD e14b067 P4D e14b067 PUD e14d067 PMD 0 Oops: Oops: 0002 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 5496 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:__outb arch/x86/include/asm/shared/io.h:22 [inline] RIP: 0010:dt2815_attach+0x5a3/0x8f0 drivers/comedi/drivers/dt2815.c:199 Code: e6 83 e6 60 31 ff e8 0c 7d e3 f8 41 83 e4 60 74 35 e8 c1 78 e3 f8 42 80 3c 2b 00 74 08 4c 89 ff e8 32 0b 4c f9 41 8b 17 ff c2 <31> 66 90 83 fd 63 75 1e e9 96 00 00 00 e8 9b 78 e3 f8 83 fd 63 75 RSP: 0018:ffffc90002a5fa78 EFLAGS: 00010206 RAX: ffffffff88df2f7f RBX: 1ffff110081a053a RCX: ffff888011d224c0 RDX: 000000000000007e RSI: 0000000000000060 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffff888011d224c0 R09: 0000000000000002 R10: 0000000000000004 R11: 0000000000000000 R12: 0000000000000060 R13: dffffc0000000000 R14: ffffc90002a5fbc0 R15: ffff888040d029d0 FS: 000055555a3d0500(0000) GS:ffff88808cf1d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffffffffffff0 CR3: 0000000040fed000 CR4: 0000000000352ef0 Call Trace: comedi_device_attach+0x51f/0x720 drivers/comedi/drivers.c:1069 do_devconfig_ioctl drivers/comedi/comedi_fops.c:928 [inline] comedi_unlocked_ioctl+0x701/0x1240 drivers/comedi/comedi_fops.c:2240 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+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f975339acb9 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:00007ffc13841358 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f9753615fa0 RCX: 00007f975339acb9 RDX: 0000200000000080 RSI: 0000000040946400 RDI: 0000000000000003 RBP: 00007f9753408bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9753615fac R14: 00007f9753615fa0 R15: 00007f9753615fa0 Modules linked in: CR2: fffffffffffffff0 ---[ end trace 0000000000000000 ]--- RIP: 0010:__outb arch/x86/include/asm/shared/io.h:22 [inline] RIP: 0010:dt2815_attach+0x5a3/0x8f0 drivers/comedi/drivers/dt2815.c:199 Code: e6 83 e6 60 31 ff e8 0c 7d e3 f8 41 83 e4 60 74 35 e8 c1 78 e3 f8 42 80 3c 2b 00 74 08 4c 89 ff e8 32 0b 4c f9 41 8b 17 ff c2 <31> 66 90 83 fd 63 75 1e e9 96 00 00 00 e8 9b 78 e3 f8 83 fd 63 75 RSP: 0018:ffffc90002a5fa78 EFLAGS: 00010206 RAX: ffffffff88df2f7f RBX: 1ffff110081a053a RCX: ffff888011d224c0 RDX: 000000000000007e RSI: 0000000000000060 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffff888011d224c0 R09: 0000000000000002 R10: 0000000000000004 R11: 0000000000000000 R12: 0000000000000060 R13: dffffc0000000000 R14: ffffc90002a5fbc0 R15: ffff888040d029d0 FS: 000055555a3d0500(0000) GS:ffff88808cf1d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffffffffffff0 CR3: 0000000040fed000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: e6 83 out %al,$0x83 2: e6 60 out %al,$0x60 4: 31 ff xor %edi,%edi 6: e8 0c 7d e3 f8 call 0xf8e37d17 b: 41 83 e4 60 and $0x60,%r12d f: 74 35 je 0x46 11: e8 c1 78 e3 f8 call 0xf8e378d7 16: 42 80 3c 2b 00 cmpb $0x0,(%rbx,%r13,1) 1b: 74 08 je 0x25 1d: 4c 89 ff mov %r15,%rdi 20: e8 32 0b 4c f9 call 0xf94c0b57 25: 41 8b 17 mov (%r15),%edx 28: ff c2 inc %edx * 2a: 31 66 90 xor %esp,-0x70(%rsi) <-- trapping instruction 2d: 83 fd 63 cmp $0x63,%ebp 30: 75 1e jne 0x50 32: e9 96 00 00 00 jmp 0xcd 37: e8 9b 78 e3 f8 call 0xf8e378d7 3c: 83 fd 63 cmp $0x63,%ebp 3f: 75 .byte 0x75 --- 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