Vulnerability Key Information Vulnerability Description Type: EA inode refcount underflow Affected Function: Issue Found: discovered that reads an EA inode refcount that is already ≤ 0, yet still attempts to apply (typically -1), causing refcount underflow and resulting in errors. Error Examples Mitigation Measures Fix Principle: If the current refcount is non-positive, treat it as disk corruption, call , and fail with instead of updating the refcount. Remove Warning: Remove since negative refcount should never occur; retain for error reporting. Prevent Consequences: This change prevents refcount underflow and subsequent chaos during orphan cleanup. Affected Files and Changes File Path: Change Statistics: 1 file changed, 8 insertions, 7 deletions Related Links and Reporter Reporter: syzbot+0be4f339a8218d2a5bb1@syzkaller.appspotmail.com Fix Link: https://syzbot.org/bug?extid=0be4f339a8218d2a5bb1