Message-ID: <25cd0e21-ed8e-1836-b0ec-c052c2276cd8@alu.unizg.hr>
Date:   Sat, 8 Oct 2022 15:41:51 +0200
From:   Mirsad Goran Todorovac <mirsad.todorovac@....unizg.hr>
To:     Thorsten Leemhuis <regressions@...mhuis.info>,
        linux-kernel@...r.kernel.org
Cc:     Marc Miltenberger <marcmiltenberger@...il.com>,
        "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>,
        Slade Watkins <srw@...dewatkins.net>
Subject: Re: 6.0.0-RC kernels trigger Firefox snap bug with 6.0.0-rc3 through
 6.0.0-rc7

On 06. 10. 2022. 18:58, Thorsten Leemhuis wrote:

> On 06.10.22 18:43, Mirsad Goran Todorovac wrote:
>> Hey Thorsten,
>>
>> On 06. 10. 2022. 15:23, Thorsten Leemhuis wrote:
>>> On 06.10.22 14:43, Mirsad Todorovac wrote:
>>>> On 10/6/22 14:25, Thorsten Leemhuis wrote:
>>>>
>>>>> One more question:
>>>>>
>>>>> On 06.10.22 14:00, Thorsten Leemhuis wrote:
>>>>> Were those two vanilla kernels? I asked in #snappy on IRC and was told
>>>>> that "snapd simply expects some ubuntu bit in patched into the kernel if
>>>>> it detects that it runs on an official ubuntu install...". This was also
>>>>> suggested "it probably makes sense to file a but in LP to make the
>>>>> kernel team aware".
>>>> Yes, last time I tried it with git clone from linux_stable on kernel.org
>>>> and
>>>> config-6.0.0-060000-generic from the official Ubuntu mainline build
>>> You don't want to do that. Better take the config used to build a
>>> working kernel (say 5.19.y) and then build 6.0 with it (after running
>>> "make olddefconfig"), because it might be a new kernel option (say for a
>>> new security technique) that might cause the problem, as explained here:
>>> https://docs.kernel.org/admin-guide/reporting-regressions.html
>> If I understood well, that would mean building www.kernel.org git
>> linux_stable
>> source with Ubuntu's config-5.9.13-051903?
> I meant "please download Linux 6.0 (ideally through git, that you have
> everything to perform a bisection), add the config from a working kernel
> (if config-5.9.13-051903 is one, yeah, then take that) as .config and
> then run "make olddefconfig" before compiling and installing the kernel
> to see if 6.0 fails with that config that was working.

Hi, Thorsten,

Having done this build with mentioned config-5.19.13-051903-config from
Ubuntu's mainline build and your recommended make option
had produced a kernel that so far did not exhibit the Firefox snap
"tab crash/wrong Verneed record version" bug.

However, the uptime is 1d 18h50min, so it might be too early to draw
a definite general conclusion.

Now, the brave conlusion seems to be that the culprit is one of the modules
added in config-6.0.0-060000-generic.

I am new to this, but is seems that we should look at some compiled-in
modules (147 loadable and 41 compiled-in):

mtodorov@...ac:~/linux/kernel$ diff -u config-5.19.13-051913-generic 
config-6.0.0-060000-generic | grep -e ^+CONFIG | less
+CONFIG_CONTEXT_TRACKING=y
+CONFIG_CONTEXT_TRACKING_IDLE=y
+CONFIG_X86_PM_TIMER=y
+CONFIG_HAVE_IMA_KEXEC=y
+CONFIG_HAVE_CONTEXT_TRACKING_USER=y
+CONFIG_HAVE_CONTEXT_TRACKING_USER_OFFSTACK=y
+CONFIG_SOFTIRQ_ON_OWN_STACK=y
+CONFIG_GET_FREE_REGION=y
+CONFIG_NET_DSA_TAG_RZN1_A5PSW=m
+CONFIG_PCI_DOE=y
+CONFIG_PCI_EPF_VNTB=m
+CONFIG_CXL_REGION=y
+CONFIG_NVME_COMMON=m
+CONFIG_NVME_AUTH=y
+CONFIG_NVME_TARGET_AUTH=y
+CONFIG_NET_DSA_MICROCHIP_KSZ_SPI=m
+CONFIG_NET_DSA_QCA8K=m
+CONFIG_NET_VENDOR_WANGXUN=y
+CONFIG_TXGBE=m
+CONFIG_BCM_NET_PHYPTP=m
+CONFIG_CAN_DEV=m
+CONFIG_CAN_VCAN=m
+CONFIG_CAN_VXCAN=m
+CONFIG_CAN_NETLINK=y
+CONFIG_CAN_CALC_BITTIMING=y
+CONFIG_CAN_RX_OFFLOAD=y
+CONFIG_CAN_CAN327=m
+CONFIG_CAN_JANZ_ICAN3=m
+CONFIG_CAN_KVASER_PCIEFD=m
+CONFIG_CAN_SLCAN=m
+CONFIG_CAN_C_CAN=m
+CONFIG_CAN_C_CAN_PLATFORM=m
+CONFIG_CAN_C_CAN_PCI=m
+CONFIG_CAN_CC770=m
+CONFIG_CAN_CC770_ISA=m
+CONFIG_CAN_CC770_PLATFORM=m
+CONFIG_CAN_CTUCANFD=m
+CONFIG_CAN_CTUCANFD_PCI=m
+CONFIG_CAN_IFI_CANFD=m
+CONFIG_CAN_M_CAN=m
+CONFIG_CAN_M_CAN_PCI=m
+CONFIG_CAN_M_CAN_PLATFORM=m
+CONFIG_CAN_M_CAN_TCAN4X5X=m
+CONFIG_CAN_PEAK_PCIEFD=m
+CONFIG_CAN_SJA1000=m
+CONFIG_CAN_EMS_PCI=m
+CONFIG_CAN_EMS_PCMCIA=m
+CONFIG_CAN_F81601=m
+CONFIG_CAN_KVASER_PCI=m
+CONFIG_CAN_PEAK_PCI=m
+CONFIG_CAN_PEAK_PCIEC=y
+CONFIG_CAN_PEAK_PCMCIA=m
+CONFIG_CAN_PLX_PCI=m
+CONFIG_CAN_SJA1000_ISA=m
+CONFIG_CAN_SJA1000_PLATFORM=m
+CONFIG_CAN_SOFTING=m
+CONFIG_CAN_SOFTING_CS=m
+CONFIG_CAN_HI311X=m
+CONFIG_CAN_MCP251X=m
+CONFIG_CAN_MCP251XFD=m
+CONFIG_CAN_8DEV_USB=m
+CONFIG_CAN_EMS_USB=m
+CONFIG_CAN_ESD_USB=m
+CONFIG_CAN_ETAS_ES58X=m
+CONFIG_CAN_GS_USB=m
+CONFIG_CAN_KVASER_USB=m
+CONFIG_CAN_MCBA_USB=m
+CONFIG_CAN_PEAK_USB=m
+CONFIG_CAN_UCAN=m
+CONFIG_TOUCHSCREEN_COLIBRI_VF50=m
+CONFIG_TCG_TIS_I2C=m
+CONFIG_SPI_MICROCHIP_CORE=m
+CONFIG_PINCTRL_METEORLAKE=m
+CONFIG_GPIO_I8255=m
+CONFIG_SENSORS_LT7182S=m
+CONFIG_VIDEO_AR0521=m
+CONFIG_APERTURE_HELPERS=y
+CONFIG_SND_HDA_CS_DSP_CONTROLS=m
+CONFIG_SND_SOC_AMD_ST_ES8336_MACH=m
+CONFIG_SND_AMD_ASOC_REMBRANDT=m
+CONFIG_SND_SOC_AMD_RPL_ACP6x=m
+CONFIG_SND_SOC_FSL_UTILS=m
+CONFIG_SND_SOC_INTEL_AVS_MACH_DA7219=m
+CONFIG_SND_SOC_INTEL_AVS_MACH_DMIC=m
+CONFIG_SND_SOC_INTEL_AVS_MACH_HDAUDIO=m
+CONFIG_SND_SOC_INTEL_AVS_MACH_I2S_TEST=m
+CONFIG_SND_SOC_INTEL_AVS_MACH_MAX98357A=m
+CONFIG_SND_SOC_INTEL_AVS_MACH_MAX98373=m
+CONFIG_SND_SOC_INTEL_AVS_MACH_NAU8825=m
+CONFIG_SND_SOC_INTEL_AVS_MACH_RT274=m
+CONFIG_SND_SOC_INTEL_AVS_MACH_RT286=m
+CONFIG_SND_SOC_INTEL_AVS_MACH_RT298=m
+CONFIG_SND_SOC_INTEL_AVS_MACH_RT5682=m
+CONFIG_SND_SOC_INTEL_AVS_MACH_SSM4567=m
+CONFIG_SND_SOC_SOF_IPC3=y
+CONFIG_SND_SOC_SOF_INTEL_IPC4=y
+CONFIG_SND_SOC_SOF_INTEL_MTL=m
+CONFIG_SND_SOC_SOF_METEORLAKE=m
+CONFIG_SND_SOC_HDA=m
+CONFIG_SND_SOC_RT274=m
+CONFIG_SND_SOC_TAS2780=m
+CONFIG_SND_SOC_WSA883X=m
+CONFIG_UCSI_STM32G0=m
+CONFIG_TYPEC_ANX7411=m
+CONFIG_LEDS_IS31FL319X=m
+CONFIG_INFINIBAND_BNXT_RE=m
+CONFIG_INFINIBAND_ERDMA=m
+CONFIG_INFINIBAND_HFI1=m
+CONFIG_INFINIBAND_MTHCA=m
+CONFIG_INFINIBAND_QIB=m
+CONFIG_INFINIBAND_QIB_DCA=y
+CONFIG_INFINIBAND_USNIC=m
+CONFIG_INFINIBAND_VMWARE_PVRDMA=m
+CONFIG_VIDEO_IPU3_IMGU=m
+CONFIG_VME_BUS=y
+CONFIG_VME_TSI148=m
+CONFIG_VME_FAKE=m
+CONFIG_CHROME_PLATFORMS=y
+CONFIG_CHROMEOS_ACPI=m
+CONFIG_CHROMEOS_LAPTOP=m
+CONFIG_CHROMEOS_PSTORE=m
+CONFIG_CHROMEOS_TBMC=m
+CONFIG_CROS_EC=m
+CONFIG_CROS_EC_I2C=m
+CONFIG_CROS_EC_ISHTP=m
+CONFIG_CROS_EC_SPI=m
+CONFIG_CROS_EC_LPC=m
+CONFIG_CROS_EC_PROTO=y
+CONFIG_CROS_KBD_LED_BACKLIGHT=m
+CONFIG_CROS_EC_CHARDEV=m
+CONFIG_CROS_EC_LIGHTBAR=m
+CONFIG_CROS_EC_DEBUGFS=m
+CONFIG_CROS_EC_SENSORHUB=m
+CONFIG_CROS_EC_SYSFS=m
+CONFIG_CROS_EC_TYPEC=m
+CONFIG_CROS_USBPD_LOGGER=m
+CONFIG_CROS_USBPD_NOTIFY=m
+CONFIG_CHROMEOS_PRIVACY_SCREEN=m
+CONFIG_WILCO_EC=m
+CONFIG_WILCO_EC_DEBUGFS=m
+CONFIG_WILCO_EC_EVENTS=m
+CONFIG_WILCO_EC_TELEMETRY=m
+CONFIG_MELLANOX_PLATFORM=y
+CONFIG_MLXREG_HOTPLUG=m
+CONFIG_MLXREG_IO=m
+CONFIG_MLXREG_LC=m
+CONFIG_NVSW_SN2201=m
+CONFIG_SURFACE_PLATFORMS=y
+CONFIG_SURFACE3_WMI=m
+CONFIG_SURFACE_3_POWER_OPREGION=m
+CONFIG_SURFACE_ACPI_NOTIFY=m
+CONFIG_SURFACE_AGGREGATOR_CDEV=m
+CONFIG_SURFACE_AGGREGATOR_HUB=m
+CONFIG_SURFACE_AGGREGATOR_REGISTRY=m
+CONFIG_SURFACE_AGGREGATOR_TABLET_SWITCH=m
+CONFIG_SURFACE_DTX=m
+CONFIG_SURFACE_GPE=m
+CONFIG_SURFACE_HOTPLUG=m
+CONFIG_SURFACE_PLATFORM_PROFILE=m
+CONFIG_SURFACE_PRO3_BUTTON=m
+CONFIG_SURFACE_AGGREGATOR=m
+CONFIG_SURFACE_AGGREGATOR_BUS=y
+CONFIG_P2SB=y
+CONFIG_ENVELOPE_DETECTOR=m
+CONFIG_SD_ADC_MODULATOR=m
+CONFIG_VF610_ADC=m
+CONFIG_PWM_CLK=m
+CONFIG_RESET_SIMPLE=y
+CONFIG_RESET_TI_TPS380X=m
+CONFIG_FPGA_MGR_MICROCHIP_SPI=m
+CONFIG_SECURITY_APPARMOR_INTROSPECT_POLICY=y
+CONFIG_SECURITY_APPARMOR_EXPORT_BINARY=y
+CONFIG_SECURITY_APPARMOR_PARANOID_LOAD=y
+CONFIG_IMA_KEXEC=y
+CONFIG_CRYPTO_XCTR=m
+CONFIG_CRYPTO_HCTR2=m
+CONFIG_CRYPTO_POLYVAL=m
+CONFIG_CRYPTO_POLYVAL_CLMUL_NI=m
+CONFIG_CRYPTO_ARIA=m
+CONFIG_CRYPTO_LIB_SHA1=y
+CONFIG_POLYNOMIAL=m
+CONFIG_DA_MON_EVENTS=y
+CONFIG_DA_MON_EVENTS_ID=y
+CONFIG_RV=y
+CONFIG_RV_MON_WWNR=y
+CONFIG_RV_REACTORS=y
+CONFIG_RV_REACT_PRINTK=y
+CONFIG_RV_REACT_PANIC=y

However, I'm stuck on this. Disecting the modules to one that caused the 
problem seems
infeasible, for it takes me two hours for a build ...

Hope this helps ...

-mt

--
Mirsad Goran Todorovac
Sistem inženjer
Grafički fakultet | Akademija likovnih umjetnosti
Sveučilište u Zagrebu
-- 
System engineer
Faculty of Graphic Arts | Academy of Fine Arts
University of Zagreb, Republic of Croatia
The European Union

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