From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugzilla-daemon@freedesktop.org Subject: [Bug 105339] Deadlock inside glClientWaitSync Date: Mon, 05 Mar 2018 01:08:50 +0000 Message-ID: References: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1909288011==" Return-path: Received: from culpepper.freedesktop.org (culpepper.freedesktop.org [IPv6:2610:10:20:722:a800:ff:fe98:4b55]) by gabe.freedesktop.org (Postfix) with ESMTP id BE1986E0C9 for ; Mon, 5 Mar 2018 01:08:50 +0000 (UTC) In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: dri-devel@lists.freedesktop.org List-Id: dri-devel@lists.freedesktop.org --===============1909288011== Content-Type: multipart/alternative; boundary="15202121300.8FcbE.14907" Content-Transfer-Encoding: 7bit --15202121300.8FcbE.14907 Date: Mon, 5 Mar 2018 01:08:50 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://bugs.freedesktop.org/ Auto-Submitted: auto-generated https://bugs.freedesktop.org/show_bug.cgi?id=3D105339 --- Comment #4 from Matias N. Goldberg --- By the way, if I change the waits to the following: while( waitRet !=3D GL_ALREADY_SIGNALED && waitRet !=3D GL_CONDITION_SATISF= IED ) { waitDuration =3D 1 second; waitRet =3D glClientWaitSync( fenceName, waitFlags, waitDuration ); assert( waitRet !=3D GL_WAIT_FAILED ); } Then it still deadlocks. glClientWaitSync returns, but the fence never completes, leaving the while() loop as an infinite loop. Once it starts deadlock, if I step inside si_fence_finish I can see that rfence->tc_token is 0, which either means that it was always 0, or it has b= een already zeroed. I do not know how to continue debugging this race condition as I am not familiar with the code. --=20 You are receiving this mail because: You are the assignee for the bug.= --15202121300.8FcbE.14907 Date: Mon, 5 Mar 2018 01:08:50 +0000 MIME-Version: 1.0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://bugs.freedesktop.org/ Auto-Submitted: auto-generated

Commen= t # 4 on bug 10533= 9 from Matias N. Goldberg 
By the way, if I change the waits to the following:

while( waitRet !=3D GL_ALREADY_SIGNALED && waitRet !=3D GL_CONDITIO=
N_SATISFIED )
{
    waitDuration =3D 1 second;
    waitRet =3D glClientWaitSync( fenceName, waitFlags, waitDuration );
    assert( waitRet !=3D GL_WAIT_FAILED );
}

Then it still deadlocks. glClientWaitSync returns, but the fence never
completes, leaving the while() loop as an infinite loop.

Once it starts deadlock, if I step inside si_fence_finish I can see that
rfence->tc_token is 0, which either means that it was always 0, or it ha=
s been
already zeroed.

I do not know how to continue debugging this race condition as I am not
familiar with the code.

You are receiving this mail because:
  • You are the assignee for the bug.
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