I am using a flake to manage my NixOS system. The code is here and it contains the autoupgrade setting to fetch a new version of nixpkgs (nixos-unstable branch):
{
system.autoUpgrade = {
enable = true;
flags = [
"--commit-lock-file"
] ++ pkgs.lib.lists.concatMap (i: ["--update-input" i]) (builtins.attrNames self.inputs);
flake = "/home/luc/src/sys";
};
}
Currently I roll back every update and try to stay on the nixpkgs commit ff377a78794d412a35245e05428c8f95fef3951f because some time after this my wifi breaks.
Now I have two questions:
1. How to debug the failing wifi?
My logs say that my wifi card is Broadcom BCM43b1. When I do sudo journalctl -b | grep -i bcm I get these lines on a good generation:
Feb 11 11:14:25 yoga kernel: usb 1-4: Product: BCM20702A0
Feb 11 11:14:25 yoga kernel: eth0: Broadcom BCM43b1 802.11 Hybrid Wireless Controller 6.30.223.271 (r587334)
Feb 11 11:14:26 yoga kernel: Bluetooth: hci0: BCM: chip id 63
Feb 11 11:14:26 yoga kernel: Bluetooth: hci0: BCM: features 0x07
Feb 11 11:14:26 yoga kernel: Bluetooth: hci0: BCM20702A
Feb 11 11:14:26 yoga kernel: Bluetooth: hci0: BCM20702A1 (001.002.014) build 0000
Feb 11 11:14:26 yoga kernel: Bluetooth: hci0: BCM: firmware Patch file not found, tried:
Feb 11 11:14:26 yoga kernel: Bluetooth: hci0: BCM: 'brcm/BCM20702A1-0489-e07a.hcd'
Feb 11 11:14:26 yoga kernel: Bluetooth: hci0: BCM: 'brcm/BCM-0489-e07a.hcd'
Feb 11 11:14:27 yoga kernel: Modules linked in: cmdlinepart intel_spi_platform intel_spi spi_nor ip6_tables joydev hid_sensor_magn_3d hid_sensor_gyro_3d hid_sensor_incl_3d xt_conntrack nf_conntrack msr hid_sensor_accel_3d nf_defrag_ipv6 hid_sensor_rotation 8021q nf_defrag_ipv4 hid_sensor_als mtd hid_sensor_trigger iTCO_wdt industrialio_triggered_buffer intel_pmc_bxt kfifo_buf hid_multitouch watchdog hid_sensor_iio_common hid_rmi mei_hdcp industrialio ip6t_rpfilter rmi_core ipt_rpfilter hid_sensor_custom i915 intel_rapl_msr xt_pkttype nf_log_ipv6 nf_log_ipv4 wmi_bmof nf_log_common xt_LOG xt_tcpudp nft_compat nft_counter snd_hda_codec_realtek sunrpc snd_hda_codec_generic ledtrig_audio snd_hda_intel x86_pkg_temp_thermal intel_powerclamp snd_intel_dspcfg uvcvideo coretemp nls_iso8859_1 crc32_pclmul snd_hda_codec btusb nls_cp437 ghash_clmulni_intel nf_tables btrtl vfat btbcm rapl btintel fat cec videobuf2_vmalloc videobuf2_memops nfnetlink intel_cstate videobuf2_v4l2 sch_fq_codel videobuf2_common deflate
Feb 11 11:14:27 yoga kernel: drm_kms_helper snd_hda_core bluetooth intel_uncore i2c_i801 videodev snd_hwdep serio_raw intel_gtt efi_pstore mei_me intel_pch_thermal i2c_smbus bcma snd_pcm mc hid_sensor_hub evdev processor_thermal_device ecdh_generic snd_timer mousedev ecc crc16 mac_hid i2c_algo_bit intel_rapl_common lpc_ich fb_sys_fops syscopyarea i2c_hid sysfillrect int340x_thermal_zone mei loop snd sysimgblt intel_soc_dts_iosf cpufreq_powersave thermal fan soundcore ideapad_laptop tun tap sparse_keymap tiny_power_button i2c_designware_platform macvlan wmi bridge battery soc_button_array pinctrl_lynxpoint stp int3400_thermal llc dw_dmac i2c_designware_core acpi_thermal_rel dw_dmac_core button acpi_pad video ac wl(PO) cfg80211 rfkill kvm_intel kvm drm irqbypass agpgart pstore backlight fuse i2c_core configfs efivarfs ip_tables x_tables autofs4 xfs libcrc32c crc32c_generic dm_crypt cbc encrypted_keys trusted tpm rng_core hid_generic usbhid hid sd_mod t10_pi crc_t10dif crct10dif_generic input_leds led_class
Feb 11 11:14:27 yoga systemd[1]: Found device BCM4352 802.11ac Wireless Network Adapter.
and these on a bad generation, where I do not have wifi connection:
Feb 11 10:59:04 yoga kernel: usb 1-4: Product: BCM20702A0
Feb 11 10:59:04 yoga kernel: eth0: Broadcom BCM43b1 802.11 Hybrid Wireless Controller 6.30.223.271 (r587334)
Feb 11 10:59:04 yoga kernel: Bluetooth: hci0: BCM: chip id 63
Feb 11 10:59:04 yoga kernel: Bluetooth: hci0: BCM: features 0x07
Feb 11 10:59:04 yoga kernel: Bluetooth: hci0: BCM20702A
Feb 11 10:59:04 yoga kernel: Bluetooth: hci0: BCM20702A1 (001.002.014) build 0000
Feb 11 10:59:04 yoga kernel: Bluetooth: hci0: BCM: firmware Patch file not found, tried:
Feb 11 10:59:04 yoga kernel: Bluetooth: hci0: BCM: 'brcm/BCM20702A1-0489-e07a.hcd'
Feb 11 10:59:04 yoga kernel: Bluetooth: hci0: BCM: 'brcm/BCM-0489-e07a.hcd'
Feb 11 10:59:04 yoga systemd[1]: Found device BCM4352 802.11ac Wireless Network Adapter.
Feb 11 10:59:07 yoga kernel: crc32_pclmul wmi_bmof nfnetlink ghash_clmulni_intel sch_fq_codel nls_iso8859_1 videobuf2_common btbcm nls_cp437 btintel vfat fat snd_compress evdev rapl ac97_bus deflate snd_pcm_dmaengine snd_pcm intel_cstate mac_hid bluetooth drm_kms_helper snd_timer mei_me efi_pstore videodev intel_pch_thermal intel_uncore loop cpufreq_powersave ecdh_generic tun serio_raw ecc crc16 tap intel_gtt macvlan processor_thermal_device i2c_i801 bcma ideapad_laptop intel_rapl_common i2c_algo_bit fb_sys_fops syscopyarea int340x_thermal_zone hid_sensor_hub mc snd bridge i2c_hid stp llc lpc_ich soundcore i2c_smbus intel_soc_dts_iosf sysfillrect sparse_keymap sysimgblt mei thermal wl(PO) wmi fan battery i2c_designware_platform soc_button_array dw_dmac i2c_designware_core dw_dmac_core pinctrl_lynxpoint video cfg80211 tiny_power_button int3400_thermal acpi_pad ac acpi_thermal_rel button rfkill kvm drm irqbypass agpgart fuse pstore backlight i2c_core configfs efivarfs ip_tables x_tables autofs4 xfs
The main difference between these seems to be the line about “Modules linked in” and if I extract these modules from the logs the diff from good (left) to bad (right) is
--- mod-good 2022-02-11 11:32:23.997645101 +0100
+++ mod-bad 2022-02-11 11:32:30.435807322 +0100
@@ -6 +5,0 @@
-8021q
@@ -7,0 +7 @@
+ac97_bus
@@ -58 +57,0 @@
-fat
@@ -130 +128,0 @@
-msr
@@ -142,2 +139,0 @@
-nls_cp437
-nls_iso8859_1
@@ -157,0 +154 @@
+snd_compress
@@ -159,0 +157 @@
+snd_hda_codec_hdmi
@@ -165,0 +164,2 @@
+snd_pcm_dmaengine
+snd_soc_core
@@ -168,0 +169,4 @@
+soundwire_bus
+soundwire_cadence
+soundwire_generic_allocation
+soundwire_intel
@@ -172 +175,0 @@
-sunrpc
@@ -187 +189,0 @@
-vfat
And additionally I see this message repeated every second in the journal of my wpa_supplicant service:
Feb 07 17:10:05 yoga wpa_supplicant[70319]: wlp1s0: CTRL-EVENT-SCAN-FAILED ret=-22 retry=1
My network config looks like this:
boot.extraModulePackages = [ config.boot.kernelPackages.broadcom_sta ];
networking.wireless.enable = true;
networking.wireless.interfaces = [ "wlp1s0" ];
networking.resolvconf.dnsExtensionMechanism = false; # because my home router is stupid
networking.useDHCP = false;
networking.interfaces.wlp1s0.useDHCP = true;
2. How to efficently bisect nixpkgs
I was thinking about bisecting nixpkgs and find the change that broke my setup (by recompiling my system against the different versions of nixpkgs).
I have a clone of the nixpkgs git repository locally where I can git bisect in order to select commits and then I can do nixos-rebuild build --overwrite-input nixpkgs nixpkgs/$COMMIT_HASH. The problem with this is that not all commits are build by Hydra and can be found on cache.nixos.org. So depending on the commit I select I might have to build a lot of stuff (including the linux kernel) and that takes to long for me to bear with.
How can I bisect nixpkgs and only select commits that are build by hydra?
For the last interval, where no more Hydra builds are available, I can then hopefully review the commits manually or build some of them locally.
,looks like you having ‘fun’.
