Hello, syzbot found the following issue on: HEAD commit: 614da38e2f7a Merge tag 'hid-for-linus-2024051401' of git:/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1701d634980000 kernel config: https://syzkaller.appspot.com/x/.config?x=f5d2cbf33633f507 dashboard link: https://syzkaller.appspot.com/bug?extid=ca5e77364a05ff2d8c8b compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/89eafb874b71/disk-614da38e.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/356000512ad9/vmlinux-614da38e.xz kernel image: https://storage.googleapis.com/syzbot-assets/839c73939115/bzImage-614da38e.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ca5e77364a05ff2d8c8b@xxxxxxxxxxxxxxxxxxxxxxxxx loop1: detected capacity change from 0 to 64 ===================================================== BUG: KMSAN: uninit-value in __hfs_ext_read_extent fs/hfs/extent.c:160 [inline] BUG: KMSAN: uninit-value in __hfs_ext_cache_extent+0x69f/0x7e0 fs/hfs/extent.c:179 __hfs_ext_read_extent fs/hfs/extent.c:160 [inline] __hfs_ext_cache_extent+0x69f/0x7e0 fs/hfs/extent.c:179 hfs_file_truncate+0x769/0xd30 fs/hfs/extent.c:526 hfs_inode_setattr+0x998/0xab0 fs/hfs/inode.c:652 notify_change+0x1a07/0x1af0 fs/attr.c:497 do_truncate fs/open.c:65 [inline] do_ftruncate+0x8d3/0xc00 fs/open.c:181 do_sys_ftruncate fs/open.c:199 [inline] __do_sys_ftruncate fs/open.c:207 [inline] __se_sys_ftruncate fs/open.c:205 [inline] __x64_sys_ftruncate+0x133/0x280 fs/open.c:205 x64_sys_call+0x247a/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:78 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was created at: slab_post_alloc_hook mm/slub.c:3877 [inline] slab_alloc_node mm/slub.c:3918 [inline] __do_kmalloc_node mm/slub.c:4038 [inline] __kmalloc+0x6e4/0x1060 mm/slub.c:4052 kmalloc include/linux/slab.h:632 [inline] hfs_find_init+0x91/0x250 fs/hfs/bfind.c:21 hfs_file_truncate+0x3c5/0xd30 fs/hfs/extent.c:512 hfs_inode_setattr+0x998/0xab0 fs/hfs/inode.c:652 notify_change+0x1a07/0x1af0 fs/attr.c:497 do_truncate fs/open.c:65 [inline] do_ftruncate+0x8d3/0xc00 fs/open.c:181 do_sys_ftruncate fs/open.c:199 [inline] __do_sys_ftruncate fs/open.c:207 [inline] __se_sys_ftruncate fs/open.c:205 [inline] __x64_sys_ftruncate+0x133/0x280 fs/open.c:205 x64_sys_call+0x247a/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:78 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 1 PID: 8137 Comm: syz-executor.1 Not tainted 6.9.0-syzkaller-02707-g614da38e2f7a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 ===================================================== --- 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 report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title 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
