Key Information 1. Vulnerability Type: - Using in preemptible code triggers a warning. 2. Report Source: - Reported by Syzbot. 3. Specific Issue Description: - BUG: Use of in preemptible code (specifically in the call stack of dhcpd/2879). - The warning occurs because and related functions do not properly handle preemptible context. 4. Commit Information: - Commit Author: Ziqiang - Commit Date: 2025-10-11 15:05:18 +0800 - Commit ID: 327cd4b68b4398b6c24f10eb2b2533ffbec10185 5. Fix Description: - For historical and compatibility reasons, typically runs in softirq or interrupt context. - This commit adds protection in to prevent accessing processor ID in preemptible context. 6. Related Links: - Syzkaller report page: https://syzkaller.appspot.com/bug?ext=81555d0587ee544baaaaa5a359a065512228cl1 - Patch submission page: https://patch.msgid.link/20251011075818.7095-1-qiang.zhang@linux.dev