Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: KMSAN: uninit-value in __hfs_ext_cache_extent loop0: detected capacity change from 0 to 64 ===================================================== BUG: KMSAN: uninit-value in __hfs_ext_read_extent fs/hfs/extent.c:163 [inline] BUG: KMSAN: uninit-value in __hfs_ext_cache_extent+0x779/0x7e0 fs/hfs/extent.c:179 __hfs_ext_read_extent fs/hfs/extent.c:163 [inline] __hfs_ext_cache_extent+0x779/0x7e0 fs/hfs/extent.c:179 hfs_ext_read_extent fs/hfs/extent.c:202 [inline] hfs_get_block+0x733/0xf50 fs/hfs/extent.c:366 __block_write_begin_int+0xa6b/0x2f80 fs/buffer.c:2121 block_write_begin fs/buffer.c:2231 [inline] cont_write_begin+0xf82/0x1940 fs/buffer.c:2582 hfs_write_begin+0x85/0x120 fs/hfs/inode.c:52 cont_expand_zero fs/buffer.c:2509 [inline] cont_write_begin+0x32f/0x1940 fs/buffer.c:2572 hfs_write_begin+0x85/0x120 fs/hfs/inode.c:52 hfs_file_truncate+0x1a5/0xd30 fs/hfs/extent.c:494 hfs_inode_setattr+0x998/0xab0 fs/hfs/inode.c:654 notify_change+0x1a8e/0x1b80 fs/attr.c:503 do_truncate+0x22a/0x2b0 fs/open.c:65 vfs_truncate+0x5d4/0x680 fs/open.c:111 do_sys_truncate+0x104/0x240 fs/open.c:134 __do_sys_truncate fs/open.c:146 [inline] __se_sys_truncate fs/open.c:144 [inline] __x64_sys_truncate+0x6c/0xa0 fs/open.c:144 x64_sys_call+0x2ce3/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:77 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Local variable fd.i created at: hfs_ext_read_extent fs/hfs/extent.c:193 [inline] hfs_get_block+0x295/0xf50 fs/hfs/extent.c:366 __block_write_begin_int+0xa6b/0x2f80 fs/buffer.c:2121 CPU: 1 UID: 0 PID: 5954 Comm: syz.0.15 Not tainted 6.12.0-rc2-syzkaller-00074-gd3d1556696c1-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 ===================================================== Tested on: commit: d3d15566 Merge tag 'mm-hotfixes-stable-2024-10-09-15-4.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17aecb27980000 kernel config: https://syzkaller.appspot.com/x/.config?x=981fe2ff8a1e457a dashboard link: https://syzkaller.appspot.com/bug?extid=d395b0c369e492a17530 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=1777005f980000
