From: Jakub Kicinski <kuba@kernel.org>
To: "Rénich Bon Ćirić" <renich@woralelandia.com>
Cc: <netdev@vger.kernel.org>, <hramamurthy@google.com>
Subject: Re: [PATCH net/gve] gve: fix early boot deadlock between rtnl_lock and service_task_mutex
Date: Wed, 5 Aug 2026 17:01:39 -0700 [thread overview]
Message-ID: <20260805170139.2ddb6216@kernel.org> (raw)
In-Reply-To: <18c88903de19db1f.df50d089680ca23.c305d6e51002e357@desktop.casa.g02.org>
On Tue, 4 Aug 2026 07:18:21 +0000 Rénich Bon Ćirić wrote:
> We hit a reproducible hard deadlock (AB-BA circular lock inversion) during early boot on EL10 / RHEL 10 kernels when running Google Cloud Platform VMs with the gve driver:
>
> 1. Thread A (NetworkManager): Holds rtnl_lock during __dev_open -> gve_open -> gve_queues_start -> gve_add_napi, and attempts to acquire service_task_mutex.
> 2. Thread B (gve_service_task worker): Holds service_task_mutex, and calls reset recovery which attempts to acquire rtnl_lock.
>
> Serial Console Trace:
> "INFO: task NetworkManager:856 is blocked on a mutex likely owned by task NetworkManager:856" at RIP: copy_net_ns+0x1a4 / selinux_netlbl_sk_security_free.
You emailed the upstream Linux list.
If the bug exists in the upstream kernel we will happily review the fix
- please post it to the list.
next prev parent reply other threads:[~2026-08-06 0:01 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-04 7:18 [PATCH net/gve] gve: fix early boot deadlock between rtnl_lock and service_task_mutex Rénich Bon Ćirić
2026-08-06 0:01 ` Jakub Kicinski [this message]
2026-08-06 21:28 ` Harshitha Ramamurthy
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