On 03/08/2024 08:57, Greg Kroah-Hartman wrote: > On Thu, Aug 01, 2024 at 07:21:25PM +0200, Stefan Lippers-Hollmann wrote: >> Hi >> >> On 2024-08-01, Stefan Lippers-Hollmann wrote: >>> On 2024-08-01, Stefan Lippers-Hollmann wrote: >>>> On 2024-07-30, Greg Kroah-Hartman wrote: >>>>> 6.10-stable review patch. If anyone has any objections, please let me know. >>>>> >>>>> ------------------ >>>>> >>>>> From: Zheng Yejian <zhengyejian1@xxxxxxxxxx> >>>>> >>>>> [ Upstream commit 2052138b7da52ad5ccaf74f736d00f39a1c9198c ] >>>>> >>>>> Infinite log printing occurs during fuzz test: >>>>> >>>>> rc rc1: DViCO FusionHDTV DVB-T USB (LGZ201) as ... >>>>> ... >>>>> dvb-usb: schedule remote query interval to 100 msecs. >>>>> dvb-usb: DViCO FusionHDTV DVB-T USB (LGZ201) successfully initialized ... >>>>> dvb-usb: bulk message failed: -22 (1/0) >>>>> dvb-usb: bulk message failed: -22 (1/0) >>>>> dvb-usb: bulk message failed: -22 (1/0) >>>>> ... >>>>> dvb-usb: bulk message failed: -22 (1/0) >>>>> >>>>> Looking into the codes, there is a loop in dvb_usb_read_remote_control(), >>>>> that is in rc_core_dvb_usb_remote_init() create a work that will call >>>>> dvb_usb_read_remote_control(), and this work will reschedule itself at >>>>> 'rc_interval' intervals to recursively call dvb_usb_read_remote_control(), >>>>> see following code snippet: >>>> [...] >>>> >>>> This patch, as part of v6.10.3-rc3 breaks my TeVii s480 dual DVB-S2 >>>> card, reverting just this patch from v6.10-rc3 fixes the situation >>>> again (a co-installed Microsoft Xbox One Digital TV DVB-T2 Tuner >>>> keeps working). >>> [...] >>> >>> Btw. I can also reproduce this (both breakage and 'fix' by reverting >>> this patch) on a another x86_64 system that only has a single TeVii >>> s480 dual DVB-S2 card (and no further v4l devices) installed. So I'm >>> seeing this on both sandy-bridge and raptor-lake x86_64 systems. >> >> This issue is also present in current linux HEAD (as of this moment, >> v6.11-rc1-63-g21b136cc63d2). >> >> A clean revert of this commit 2052138b7da52ad5ccaf74f736d00f39a1c9198c >> "media: dvb-usb: Fix unexpected infinite loop in >> dvb_usb_read_remote_control()" avoids the problem for v6.11~ as well. > > As this issue is in Linus's tree, please work to get it resolved there > first and then we will gladly take the changes here Sean, I assume you'll look into this? Regards, Hans (Added a Cc to the linux-media ML)
