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charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 08215f5486ec Merge tag 'kbuild-fixes-v6.16' of git://git.k.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=13f7fd70580000 kernel config: https://syzkaller.appspot.com/x/.config?x=61539536677af51c dashboard link: https://syzkaller.appspot.com/bug?extid=9b9124ae9b12d5af5d95 compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17f7fd70580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1485690c580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/01c395d764eb/disk-08215f54.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/15fc58e6441d/vmlinux-08215f54.xz kernel image: https://storage.googleapis.com/syzbot-assets/dbd5ac78ef83/bzImage-08215f54.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9b9124ae9b12d5af5d95@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:114 [inline] BUG: KMSAN: kernel-infoleak in _inline_copy_to_user include/linux/uaccess.h:196 [inline] BUG: KMSAN: kernel-infoleak in _copy_to_user+0xcc/0x120 lib/usercopy.c:26 instrument_copy_to_user include/linux/instrumented.h:114 [inline] _inline_copy_to_user include/linux/uaccess.h:196 [inline] _copy_to_user+0xcc/0x120 lib/usercopy.c:26 copy_to_user include/linux/uaccess.h:225 [inline] vmci_host_do_receive_datagram drivers/misc/vmw_vmci/vmci_host.c:438 [inline] vmci_host_unlocked_ioctl+0x1e7e/0x5200 drivers/misc/vmw_vmci/vmci_host.c:932 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 Local variable __x.i.i created at: set_xfeature_in_sigframe arch/x86/kernel/fpu/xstate.h:81 [inline] save_xstate_epilog arch/x86/kernel/fpu/signal.c:140 [inline] copy_fpstate_to_sigframe+0x11f2/0x13d0 arch/x86/kernel/fpu/signal.c:232 get_sigframe+0xc6a/0x1020 arch/x86/kernel/signal.c:163 Bytes 28-31 of 40 are uninitialized Memory access of size 40 starts at ffff888131f74080 Data copied to user address 000000000000a4bf CPU: 1 UID: 0 PID: 5798 Comm: syz-executor419 Not tainted 6.16.0-rc1-syzkaller-00239-g08215f5486ec #0 PREEMPT(undef) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 ===================================================== --- 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