linux-kernel - [Bug] soft lockup in __sock_create in Linux kernel v6.15

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Message-ID: <CALm_T+3m_BDfKz3kPm_PmwH9BnsSySGxHE-hdceGQzObL+M6BA@mail.gmail.com>
Date: Tue, 8 Jul 2025 15:40:10 +0800
From: Luka <luka.2016.cs@...il.com>
To: Eric Dumazet <edumazet@...gle.com>, Kuniyuki Iwashima <kuniyu@...zon.com>, 
	Paolo Abeni <pabeni@...hat.com>, Willem de Bruijn <willemb@...gle.com>, 
	"David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>
Cc: Simon Horman <horms@...nel.org>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [Bug] soft lockup in __sock_create in Linux kernel v6.15

Dear Linux Kernel Maintainers,

I hope this message finds you well.

I am writing to report a potential vulnerability I encountered during
testing of the Linux Kernel version v6.15.

Git Commit: 0ff41df1cb268fc69e703a08a57ee14ae967d0ca (tag: v6.15)

Bug Location: __sock_create+0x369/0x810 net/socket.c:1541

Bug report: https://pastebin.com/X0NX8ddd

Complete log: https://pastebin.com/Kbsk4Qrc

Entire kernel config: https://pastebin.com/jQ30sdLk

Root Cause Analysis:

During socket creation, prolonged lock retention within
__sock_create() leads to a soft lockup, suggesting a potential
deadlock or excessive CPU consumption in socket allocation and
RCU-related memory management.

At present, I have not yet obtained a minimal reproducer for this
issue. However, I am actively working on reproducing it, and I will
promptly share any additional findings or a working reproducer as soon
as it becomes available.

Thank you very much for your time and attention to this matter. I
truly appreciate the efforts of the Linux kernel community.

Best regards,
Luka