[syzbot] [i2c?] KMSAN: uninit-value in __i2c_smbus_xfer

[syzbot] [i2c?] KMSAN: uninit-value in __i2c_smbus_xfer

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    02ddfb981de8 Merge tag 'scsi-fixes' of git://git.kernel.or..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=1034139b980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=9dc42c34a3f5c357
dashboard link: https://syzkaller.appspot.com/bug?extid=0a36c1fec090c67a9885
compiler:       Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10c9df74580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1550f1b3980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/5ca57f5a3f77/disk-02ddfb98.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/3f23cbc11e68/vmlinux-02ddfb98.xz
kernel image: https://storage.googleapis.com/syzbot-assets/73e63afac354/bzImage-02ddfb98.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+0a36c1fec090c67a9885@syzkaller.appspotmail.com

=====================================================
BUG: KMSAN: uninit-value in i2c_smbus_xfer_emulated drivers/i2c/i2c-core-smbus.c:481 [inline]
BUG: KMSAN: uninit-value in __i2c_smbus_xfer+0x23e7/0x2f60 drivers/i2c/i2c-core-smbus.c:607
 i2c_smbus_xfer_emulated drivers/i2c/i2c-core-smbus.c:481 [inline]
 __i2c_smbus_xfer+0x23e7/0x2f60 drivers/i2c/i2c-core-smbus.c:607
 i2c_smbus_xfer+0x31d/0x4d0 drivers/i2c/i2c-core-smbus.c:545
 i2cdev_ioctl_smbus+0x4a1/0x660 drivers/i2c/i2c-dev.c:389
 i2cdev_ioctl+0xa14/0xf40 drivers/i2c/i2c-dev.c:478
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:906 [inline]
 __se_sys_ioctl+0x239/0x400 fs/ioctl.c:892
 __x64_sys_ioctl+0x97/0xe0 fs/ioctl.c:892
 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+0xd9/0x1b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Local variable page created at:
 get_futex_key+0x6f/0x11d0 kernel/futex/core.c:227
 futex_wake+0xfe/0x890 kernel/futex/waitwake.c:166

CPU: 1 UID: 0 PID: 5795 Comm: syz-executor470 Not tainted 6.15.0-rc3-syzkaller-00094-g02ddfb981de8 #0 PREEMPT(undef) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
=====================================================


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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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:
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(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
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If you want to undo deduplication, reply with:
#syz undup

Re: [syzbot] [i2c?] KMSAN: uninit-value in __i2c_smbus_xfer

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

kernel/futex/core.c:629:15: error: no member named 'page' in 'struct futex_key::(unnamed at ./include/linux/futex.h:33:2)'


Tested on:

commit:         feacb177 Merge tag 'sched_ext-for-6.16' of git://git.k..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=9dc42c34a3f5c357
dashboard link: https://syzkaller.appspot.com/bug?extid=0a36c1fec090c67a9885
compiler:       Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
patch:          https://syzkaller.appspot.com/x/patch.diff?x=14ae03f4580000

Re: [syzbot] [i2c?] KMSAN: uninit-value in __i2c_smbus_xfer

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KMSAN: uninit-value in __i2c_smbus_xfer

=====================================================
BUG: KMSAN: uninit-value in i2c_smbus_xfer_emulated drivers/i2c/i2c-core-smbus.c:481 [inline]
BUG: KMSAN: uninit-value in __i2c_smbus_xfer+0x23e7/0x2f60 drivers/i2c/i2c-core-smbus.c:607
 i2c_smbus_xfer_emulated drivers/i2c/i2c-core-smbus.c:481 [inline]
 __i2c_smbus_xfer+0x23e7/0x2f60 drivers/i2c/i2c-core-smbus.c:607
 i2c_smbus_xfer+0x31d/0x4d0 drivers/i2c/i2c-core-smbus.c:545
 i2cdev_ioctl_smbus+0x4a1/0x660 drivers/i2c/i2c-dev.c:389
 i2cdev_ioctl+0xa14/0xf40 drivers/i2c/i2c-dev.c:478
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0x239/0x400 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

Local variable msgbuf0.i created at:
 i2c_smbus_xfer_emulated drivers/i2c/i2c-core-smbus.c:333 [inline]
 __i2c_smbus_xfer+0x84e/0x2f60 drivers/i2c/i2c-core-smbus.c:607
 i2c_smbus_xfer+0x31d/0x4d0 drivers/i2c/i2c-core-smbus.c:545

CPU: 1 UID: 0 PID: 6939 Comm: syz.0.19 Not tainted 6.15.0-syzkaller-03645-g3d413f0cfd7e-dirty #0 PREEMPT(undef) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
=====================================================


Tested on:

commit:         3d413f0c Merge tag 'audit-pr-20250527' of git://git.ke..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=164083f4580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d8d64ec943874853
dashboard link: https://syzkaller.appspot.com/bug?extid=0a36c1fec090c67a9885
compiler:       Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
patch:          https://syzkaller.appspot.com/x/patch.diff?x=1157abf4580000

Re: [syzbot] [i2c?] KMSAN: uninit-value in __i2c_smbus_xfer

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KMSAN: uninit-value in __i2c_smbus_xfer

=====================================================
BUG: KMSAN: uninit-value in i2c_smbus_xfer_emulated drivers/i2c/i2c-core-smbus.c:484 [inline]
BUG: KMSAN: uninit-value in __i2c_smbus_xfer+0x2542/0x3140 drivers/i2c/i2c-core-smbus.c:610
 i2c_smbus_xfer_emulated drivers/i2c/i2c-core-smbus.c:484 [inline]
 __i2c_smbus_xfer+0x2542/0x3140 drivers/i2c/i2c-core-smbus.c:610
 i2c_smbus_xfer+0x31d/0x4d0 drivers/i2c/i2c-core-smbus.c:548
 i2cdev_ioctl_smbus+0x4a1/0x660 drivers/i2c/i2c-dev.c:389
 i2cdev_ioctl+0xa14/0xf40 drivers/i2c/i2c-dev.c:478
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0x239/0x400 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

Local variable msgbuf0.i created at:
 i2c_smbus_xfer_emulated drivers/i2c/i2c-core-smbus.c:335 [inline]
 __i2c_smbus_xfer+0x864/0x3140 drivers/i2c/i2c-core-smbus.c:610
 i2c_smbus_xfer+0x31d/0x4d0 drivers/i2c/i2c-core-smbus.c:548

CPU: 0 UID: 0 PID: 7066 Comm: syz.0.33 Not tainted 6.15.0-syzkaller-07774-g90b83efa6701-dirty #0 PREEMPT(undef) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
=====================================================


Tested on:

commit:         90b83efa Merge tag 'bpf-next-6.16' of git://git.kernel..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13654970580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1da44e3e5e6013db
dashboard link: https://syzkaller.appspot.com/bug?extid=0a36c1fec090c67a9885
compiler:       Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
patch:          https://syzkaller.appspot.com/x/patch.diff?x=12534ed4580000

Re: [syzbot] [i2c?] KMSAN: uninit-value in __i2c_smbus_xfer

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+0a36c1fec090c67a9885@syzkaller.appspotmail.com
Tested-by: syzbot+0a36c1fec090c67a9885@syzkaller.appspotmail.com

Tested on:

commit:         90b83efa Merge tag 'bpf-next-6.16' of git://git.kernel..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=178d2482580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1da44e3e5e6013db
dashboard link: https://syzkaller.appspot.com/bug?extid=0a36c1fec090c67a9885
compiler:       Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
patch:          https://syzkaller.appspot.com/x/patch.diff?x=10c8ced4580000

Note: testing is done by a robot and is best-effort only.

Re: [syzbot] [i2c?] KMSAN: uninit-value in __i2c_smbus_xfer

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

fs/bcachefs/sb-members.c:68:44: error: no member named 'size' in 'struct bch_sb_field'


Tested on:

commit:         5abc7438 Merge tag 'nfs-for-6.16-1' of git://git.linux..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=9dc42c34a3f5c357
dashboard link: https://syzkaller.appspot.com/bug?extid=0a36c1fec090c67a9885
compiler:       Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
patch:          https://syzkaller.appspot.com/x/patch.diff?x=11f5c570580000