linux-kernel - Sometimes DVB broken with commit 6769a0b7ee0c3b

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Date:   Tue, 30 May 2023 13:12:57 +0200 (CEST)
From:   Thomas Voegtle <tv@...96.de>
To:     linux-kernel@...r.kernel.org, Hyunwoo Kim <imv4bel@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Subject: Sometimes DVB broken with commit 6769a0b7ee0c3b


Hello,


I have the problem that sometimes my DVB card does not initialize 
properly booting Linux 6.4-rc4.
This is not always, maybe in 3 out of 4 attempts.
When this happens somehow you don't see anything special in dmesg, but the 
card just doesn't work.

Reverting this helps:
commit 6769a0b7ee0c3b31e1b22c3fadff2bfb642de23f
Author: Hyunwoo Kim <imv4bel@...il.com>
Date:   Thu Nov 17 04:59:22 2022 +0000

     media: dvb-core: Fix use-after-free on race condition at dvb_frontend


I have:
03:00.0 Multimedia video controller [0400]: Conexant Systems, Inc. 
CX23887/8
PCIe Broadcast Audio and Video Decoder with 3D Comb [14f1:8880] (rev 04)
         Subsystem: Hauppauge computer works Inc. Device [0070:c138]
         Kernel driver in use: cx23885


zcat /proc/config.gz | grep ^CONFIG_DVB
CONFIG_DVB_CORE=y
CONFIG_DVB_MMAP=y
CONFIG_DVB_NET=y
CONFIG_DVB_MAX_ADAPTERS=8
CONFIG_DVB_DYNAMIC_MINORS=y
CONFIG_DVB_USB=y
CONFIG_DVB_USB_TTUSB2=y
CONFIG_DVB_M88DS3103=y
CONFIG_DVB_STB0899=y
CONFIG_DVB_STB6100=y
CONFIG_DVB_STV090x=y
CONFIG_DVB_DRXK=y
CONFIG_DVB_SI2165=y
CONFIG_DVB_CX24116=y
CONFIG_DVB_CX24117=y
CONFIG_DVB_DS3000=y
CONFIG_DVB_STV0299=y
CONFIG_DVB_STV0900=y
CONFIG_DVB_STV6110=y
CONFIG_DVB_TDA10071=y
CONFIG_DVB_TDA10086=y
CONFIG_DVB_TDA8261=y
CONFIG_DVB_TDA826X=y
CONFIG_DVB_TS2020=y
CONFIG_DVB_TUA6100=y
CONFIG_DVB_DIB7000P=y
CONFIG_DVB_SI2168=y
CONFIG_DVB_STV0367=y
CONFIG_DVB_TDA10048=y
CONFIG_DVB_TDA1004X=y
CONFIG_DVB_ZL10353=y
CONFIG_DVB_TDA10021=y
CONFIG_DVB_TDA10023=y
CONFIG_DVB_LGDT330X=y
CONFIG_DVB_S5H1409=y
CONFIG_DVB_S5H1411=y
CONFIG_DVB_MB86A20S=y
CONFIG_DVB_PLL=y
CONFIG_DVB_TUNER_DIB0070=y
CONFIG_DVB_A8293=y
CONFIG_DVB_LNBP21=y