From: syzbot <syzbot+cb96ec476fb4914445c9@syzkaller.appspotmail.com>
To: abbotti@mev.co.uk, hsweeten@visionengravers.com,
linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com
Subject: [syzbot] [kernel?] KMSAN: uninit-value in dt2817_dio_insn_bits
Date: Mon, 07 Jul 2025 03:39:31 -0700 [thread overview]
Message-ID: <686ba3e3.a00a0220.c7b3.007f.GAE@google.com> (raw)
Hello,
syzbot found the following issue on:
HEAD commit: a79a588fc176 Merge tag 'pm-6.16-rc5' of git://git.kernel.o..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10e62582580000
kernel config: https://syzkaller.appspot.com/x/.config?x=aa9af7332485152e
dashboard link: https://syzkaller.appspot.com/bug?extid=cb96ec476fb4914445c9
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/b7cf1187020f/disk-a79a588f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/47e08d61ef4b/vmlinux-a79a588f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/75d3bcd3c8e0/bzImage-a79a588f.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+cb96ec476fb4914445c9@syzkaller.appspotmail.com
=====================================================
BUG: KMSAN: uninit-value in __outb arch/x86/include/asm/shared/io.h:22 [inline]
BUG: KMSAN: uninit-value in dt2817_dio_insn_bits+0x42d/0x4b0 drivers/comedi/drivers/dt2817.c:82
__outb arch/x86/include/asm/shared/io.h:22 [inline]
dt2817_dio_insn_bits+0x42d/0x4b0 drivers/comedi/drivers/dt2817.c:82
insn_rw_emulate_bits+0x3a6/0x560 drivers/comedi/drivers.c:632
parse_insn+0x14b0/0x1780 drivers/comedi/comedi_fops.c:-1
do_insnlist_ioctl+0x412/0x890 drivers/comedi/comedi_fops.c:1568
comedi_unlocked_ioctl+0x1c6b/0x1e00 drivers/comedi/comedi_fops.c:2253
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl+0x23c/0x400 fs/ioctl.c:893
__x64_sys_ioctl+0x97/0xe0 fs/ioctl.c:893
x64_sys_call+0x1ebe/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:17
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Uninit was stored to memory at:
comedi_dio_update_state+0x244/0x250 drivers/comedi/drivers.c:392
dt2817_dio_insn_bits+0x6e/0x4b0 drivers/comedi/drivers/dt2817.c:79
insn_rw_emulate_bits+0x3a6/0x560 drivers/comedi/drivers.c:632
parse_insn+0x14b0/0x1780 drivers/comedi/comedi_fops.c:-1
do_insnlist_ioctl+0x412/0x890 drivers/comedi/comedi_fops.c:1568
comedi_unlocked_ioctl+0x1c6b/0x1e00 drivers/comedi/comedi_fops.c:2253
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl+0x23c/0x400 fs/ioctl.c:893
__x64_sys_ioctl+0x97/0xe0 fs/ioctl.c:893
x64_sys_call+0x1ebe/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:17
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Uninit was stored to memory at:
insn_rw_emulate_bits+0x52d/0x560 drivers/comedi/drivers.c:629
parse_insn+0x14b0/0x1780 drivers/comedi/comedi_fops.c:-1
do_insnlist_ioctl+0x412/0x890 drivers/comedi/comedi_fops.c:1568
comedi_unlocked_ioctl+0x1c6b/0x1e00 drivers/comedi/comedi_fops.c:2253
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl+0x23c/0x400 fs/ioctl.c:893
__x64_sys_ioctl+0x97/0xe0 fs/ioctl.c:893
x64_sys_call+0x1ebe/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:17
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Uninit was created at:
slab_post_alloc_hook mm/slub.c:4154 [inline]
slab_alloc_node mm/slub.c:4197 [inline]
__do_kmalloc_node mm/slub.c:4327 [inline]
__kmalloc_noprof+0x95f/0x1310 mm/slub.c:4340
kmalloc_noprof include/linux/slab.h:909 [inline]
kmalloc_array_noprof include/linux/slab.h:948 [inline]
do_insnlist_ioctl+0x1b2/0x890 drivers/comedi/comedi_fops.c:1551
comedi_unlocked_ioctl+0x1c6b/0x1e00 drivers/comedi/comedi_fops.c:2253
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl+0x23c/0x400 fs/ioctl.c:893
__x64_sys_ioctl+0x97/0xe0 fs/ioctl.c:893
x64_sys_call+0x1ebe/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:17
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
CPU: 1 UID: 0 PID: 6184 Comm: syz.4.49 Not tainted 6.16.0-rc4-syzkaller-00308-ga79a588fc176 #0 PREEMPT(undef)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
=====================================================
---
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reply other threads:[~2025-07-07 10:39 UTC|newest]
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