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Fri, 01 Apr 2022 07:33:14 -0700 (PDT) From: Jason Andryuk To: xen-devel@lists.xenproject.org Cc: Jason Andryuk , Wei Liu , Anthony PERARD , Juergen Gross Subject: [PATCH v2] libxl: Re-scope qmp_proxy_spawn.ao usage Date: Fri, 1 Apr 2022 10:33:10 -0400 Message-Id: <20220401143310.17743-1-jandryuk@gmail.com> X-Mailer: git-send-email 2.35.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1648823631041100001 Content-Type: text/plain; charset="utf-8" I've observed this failed assertion: libxl_event.c:2057: libxl__ao_inprogress_gc: Assertion `ao' failed. AFAICT, this is happening in qmp_proxy_spawn_outcome where sdss->qmp_proxy_spawn.ao is NULL. The out label of spawn_stub_launch_dm() calls qmp_proxy_spawn_outcome(), but it is only in the success path that sdss->qmp_proxy_spawn.ao gets set to the current ao. qmp_proxy_spawn_outcome() should instead use sdss->dm.spawn.ao, which is the already in-use ao when spawn_stub_launch_dm() is called. The same is true for spawn_qmp_proxy(). With this, move sdss->qmp_proxy_spawn.ao initialization to spawn_qmp_proxy() since its use is for libxl__spawn_spawn() and it can be initialized along with the rest of sdss->qmp_proxy_spawn. Fixes: 83c845033dc8 ("libxl: use vchan for QMP access with Linux stubdomain= ") Signed-off-by: Jason Andryuk --- v2: Change subject Add Fixes Change to using sdss->dm.spawn.ao tools/libs/light/libxl_dm.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/tools/libs/light/libxl_dm.c b/tools/libs/light/libxl_dm.c index 9a8ddbe188..1864ee30f0 100644 --- a/tools/libs/light/libxl_dm.c +++ b/tools/libs/light/libxl_dm.c @@ -2567,7 +2567,6 @@ static void spawn_stub_launch_dm(libxl__egc *egc, goto out; } =20 - sdss->qmp_proxy_spawn.ao =3D ao; if (libxl__stubdomain_is_linux(&guest_config->b_info)) { spawn_qmp_proxy(egc, sdss); } else { @@ -2584,7 +2583,7 @@ out: static void spawn_qmp_proxy(libxl__egc *egc, libxl__stub_dm_spawn_state *sdss) { - STATE_AO_GC(sdss->qmp_proxy_spawn.ao); + STATE_AO_GC(sdss->dm.spawn.ao); const uint32_t guest_domid =3D sdss->dm.guest_domid; const uint32_t dm_domid =3D sdss->pvqemu.guest_domid; const char *dom_path =3D libxl__xs_get_dompath(gc, dm_domid); @@ -2598,6 +2597,7 @@ static void spawn_qmp_proxy(libxl__egc *egc, goto out; } =20 + sdss->qmp_proxy_spawn.ao =3D ao; sdss->qmp_proxy_spawn.what =3D GCSPRINTF("domain %d device model qmp p= roxy", guest_domid); sdss->qmp_proxy_spawn.pidpath =3D GCSPRINTF("%s/image/qmp-proxy-pid", = dom_path); sdss->qmp_proxy_spawn.xspath =3D DEVICE_MODEL_XS_PATH(gc, LIBXL_TOOLST= ACK_DOMID, @@ -2685,7 +2685,7 @@ static void qmp_proxy_spawn_outcome(libxl__egc *egc, libxl__stub_dm_spawn_state *sdss, int rc) { - STATE_AO_GC(sdss->qmp_proxy_spawn.ao); + STATE_AO_GC(sdss->dm.spawn.ao); /* * Until xenconsoled learns how to handle multiple consoles, require q= emu * in dom0 to serve consoles for a stubdomain - it require at least 3 = of them. --=20 2.35.1