Hello, syzbot found the following issue on: HEAD commit: 2741f1b02117 string: use __builtin_memcpy() in strlcpy/str.. git tree: https://github.com/google/kmsan.git master console+strace: https://syzkaller.appspot.com/x/log.txt?x=17bb33d1280000 kernel config: https://syzkaller.appspot.com/x/.config?x=753079601b2300f9 dashboard link: https://syzkaller.appspot.com/bug?extid=4fad2e57beb6397ab2fc compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16d669a5280000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14d8f095280000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/ebd05512d8d7/disk-2741f1b0.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/aa555b09582c/vmlinux-2741f1b0.xz kernel image: https://storage.googleapis.com/syzbot-assets/5ea0934e02cc/bzImage-2741f1b0.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+4fad2e57beb6397ab2fc@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================================== BUG: KMSAN: uninit-value in drm_mode_setcrtc+0x1ad3/0x24a0 drivers/gpu/drm/drm_crtc.c:896 drm_mode_setcrtc+0x1ad3/0x24a0 drivers/gpu/drm/drm_crtc.c:896 drm_ioctl_kernel+0x5ae/0x730 drivers/gpu/drm/drm_ioctl.c:788 drm_ioctl+0xd12/0x1590 drivers/gpu/drm/drm_ioctl.c:891 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0x222/0x400 fs/ioctl.c:856 __x64_sys_ioctl+0x96/0xe0 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Uninit was created at: slab_post_alloc_hook+0x12d/0xb60 mm/slab.h:716 slab_alloc_node mm/slub.c:3451 [inline] __kmem_cache_alloc_node+0x4ff/0x8b0 mm/slub.c:3490 __do_kmalloc_node mm/slab_common.c:965 [inline] __kmalloc+0x121/0x3c0 mm/slab_common.c:979 kmalloc_array include/linux/slab.h:596 [inline] drm_mode_setcrtc+0x1dba/0x24a0 drivers/gpu/drm/drm_crtc.c:846 drm_ioctl_kernel+0x5ae/0x730 drivers/gpu/drm/drm_ioctl.c:788 drm_ioctl+0xd12/0x1590 drivers/gpu/drm/drm_ioctl.c:891 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0x222/0x400 fs/ioctl.c:856 __x64_sys_ioctl+0x96/0xe0 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd CPU: 1 PID: 4955 Comm: syz-executor275 Not tainted 6.4.0-rc4-syzkaller-g2741f1b02117 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 ===================================================== --- 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@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the bug is already fixed, 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 change bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
