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a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1773734793; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=Z4U99hlQUgfbaLsEk4Tlb2mniZhJ236YrLd0kHtjiRY=; b=VyoluNJLKjl1zd19T/HZupfGntyBU4V/AagESimy7s2vHYFrsq/CZvvJ8APWQ5znYUMClp xQEAEhcJCvEXPwLMeyHLkCtvV6sHPISj/4hBASBw9I1ena5vFxEPm98cl/v1kSyUHBVuKI ScaVjJix+qZOSnfzNDIJSsdCuPgjJ5k= X-MC-Unique: ib1YRWjtPdKFxMwHx-kIew-1 X-Mimecast-MFC-AGG-ID: ib1YRWjtPdKFxMwHx-kIew_1773734789 From: Thomas Huth To: Mark Cave-Ayland , qemu-devel@nongnu.org Cc: qemu-trivial@nongnu.org, BALATON Zoltan , Markus Armbruster Subject: [PATCH] hw/display/cg3: Fix crash when introspecting cgthree from the CLI Date: Tue, 17 Mar 2026 09:06:23 +0100 Message-ID: <20260317080623.438230-1-thuth@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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charset="utf-8" From: Thomas Huth QEMU currently crashes when introspecting the cgthree device from the command line interface: $ ./qemu-system-sparc -device cgthree,help Segmentation fault (core dumped) This happens because the memory_region_init_rom() function internally calls qemu_ram_alloc_internal() that needs the current_machine pointer to be set up - which is not the case here since the machine has not been created yet. There does not seem to be a compelling reason for initializing the memory regions from the instance_init function, so let's simply move the code into the realize() function instead to fix this issue. Signed-off-by: Thomas Huth Tested-by: Markus Armbruster --- hw/display/cg3.c | 18 ++++++------------ 1 file changed, 6 insertions(+), 12 deletions(-) diff --git a/hw/display/cg3.c b/hw/display/cg3.c index 61bdb0552e9..0a413fbb7ec 100644 --- a/hw/display/cg3.c +++ b/hw/display/cg3.c @@ -277,10 +277,13 @@ static const GraphicHwOps cg3_ops =3D { .gfx_update =3D cg3_update_display, }; =20 -static void cg3_initfn(Object *obj) +static void cg3_realizefn(DeviceState *dev, Error **errp) { - SysBusDevice *sbd =3D SYS_BUS_DEVICE(obj); - CG3State *s =3D CG3(obj); + SysBusDevice *sbd =3D SYS_BUS_DEVICE(dev); + Object *obj =3D OBJECT(dev); + CG3State *s =3D CG3(dev); + int ret; + char *fcode_filename; =20 memory_region_init_rom(&s->rom, obj, "cg3.prom", FCODE_MAX_ROM_SIZE, &error_fatal); @@ -289,14 +292,6 @@ static void cg3_initfn(Object *obj) memory_region_init_io(&s->reg, obj, &cg3_reg_ops, s, "cg3.reg", CG3_REG_SIZE); sysbus_init_mmio(sbd, &s->reg); -} - -static void cg3_realizefn(DeviceState *dev, Error **errp) -{ - SysBusDevice *sbd =3D SYS_BUS_DEVICE(dev); - CG3State *s =3D CG3(dev); - int ret; - char *fcode_filename; =20 /* FCode ROM */ fcode_filename =3D qemu_find_file(QEMU_FILE_TYPE_BIOS, CG3_ROM_FILE); @@ -381,7 +376,6 @@ static const TypeInfo cg3_info =3D { .name =3D TYPE_CG3, .parent =3D TYPE_SYS_BUS_DEVICE, .instance_size =3D sizeof(CG3State), - .instance_init =3D cg3_initfn, .class_init =3D cg3_class_init, }; =20 --=20 2.53.0