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[BUG] improper locking due to the unreleased lock

To: <xen-devel@xxxxxxxxxxxxx>, <ian.jackson@xxxxxxxxxxxxx>
From: Ryan Cai <ryancaicse@xxxxxxxxx>
Date: Tue, 12 Oct 2021 14:54:57 +0800
Delivery-date: Tue, 12 Oct 2021 07:10:52 +0000
List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Thread-topic: [BUG] improper locking due to the unreleased lock

Dear maintainers for Xen Project,

I am writing you to report a bug due to the unreleased lock. The impact could be deadlock or memory consumption. In the function of read_watch_internal, the mutex lock h->watch_mutex (Line901) is not released correctly when read_message(h,nonblocking)== -1(Line 923). Looking forward to your feedback. Thank for checking.

Locations, https://github.com/xen-project/xen/blob/master/tools/libs/store/xs.c#L902-L924

Best,

Ryan Cai

Follow-Ups:
- Re: [BUG] improper locking due to the unreleased lock
  - From: Juergen Gross

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