Hi With kernel 4.16 I experience a loss in signal strength on rtl8723be, it is very similar to having the ant_sel parameter wrong (or missing), iw scan shows only my own access point next to me and with a signal strength of under -60 rather than above -30. I bisected this down to 874e837d67d0db179c9771f38fd21df07c703e93 being the offending commit. I have also seen three BUGs that might be related. They appear when setting ant_sel=1 * The first one occurred (both on Debians 4.16.5 kernel and on mainline 4.17-rc5) when I did modprobe rtl8723be ant_sel=1, after a modprobe -r rtl8723be. * The second one when booting with ant_sel=1 in /etc/modprobe.d. * The third one is when booting 874e837d67d0db179c9771f38fd21df07c703e93 and having ant_sel=1. Correct (at least on 4.15.0) for this laptop is ant_sel=2. Thankful for any help Mattias Jernberg [ 257.359995] list_del corruption. prev->next should be 00000000d2a848bc, but was 00000000d9e846c0 [ 257.360020] ------------[ cut here ]------------ [ 257.360021] kernel BUG at /build/linux-hny3SU/linux-4.16.5/lib/list_debug.c:53! [ 257.360026] invalid opcode: 0000 [#1] SMP PTI [ 257.360027] Modules linked in: rtl8723be btcoexist rtl8723_common rtl_pci rtlwifi mac80211 cfg80211 rfcomm 8021q garp mrp stp llc cmac snd_hrtimer snd_seq snd_seq_device bnep nls_ascii nls_cp437 vfat fat snd_soc_skl hp_wmi snd_hda_codec_hdmi intel_rapl wmi_bmof snd_soc_skl_ipc x86_pkg_temp_thermal intel_powerclamp coretemp snd_hda_ext_core snd_soc_sst_dsp snd_hda_codec_realtek arc4 snd_soc_sst_ipc kvm_intel snd_hda_codec_generic snd_soc_acpi kvm snd_soc_core irqbypass snd_compress intel_cstate efi_pstore btusb snd_hda_intel btrtl btbcm snd_hda_codec btintel snd_hda_core snd_hwdep intel_uncore snd_pcm intel_rapl_perf bluetooth serio_raw intel_th_gth snd_timer snd evdev soundcore efivars joydev pcspkr i915 rtsx_pci_ms iTCO_wdt uvcvideo iTCO_vendor_support memstick intel_th_pci intel_th videobuf2_vmalloc [ 257.360081] hid_sensor_accel_3d hid_sensor_rotation videobuf2_memops drbg hid_sensor_magn_3d hid_sensor_incl_3d videobuf2_v4l2 hid_sensor_gyro_3d drm_kms_helper hid_sensor_trigger videobuf2_common ansi_cprng hid_sensor_iio_common industrialio_triggered_buffer sg kfifo_buf videodev ecdh_generic mei_me hid_multitouch industrialio drm media rfkill idma64 i2c_algo_bit shpchp mei processor_thermal_device intel_lpss_pci intel_lpss intel_soc_dts_iosf intel_pch_thermal tpm_crb tpm_tis intel_vbtn int3403_thermal wmi tpm_tis_core sparse_keymap soc_button_array battery ac int340x_thermal_zone tpm hp_wireless video rng_core int3400_thermal acpi_pad acpi_thermal_rel button sunrpc efivarfs ip_tables x_tables autofs4 ext4 crc16 mbcache jbd2 fscrypto ecb algif_skcipher af_alg dm_crypt dm_mod raid10 raid456 async_raid6_recov [ 257.360114] async_memcpy async_pq async_xor async_tx xor hid_sensor_custom hid_sensor_hub hid_generic usbhid hid raid6_pq libcrc32c crc32c_generic raid1 raid0 multipath linear md_mod sd_mod crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel pcbc rtsx_pci_sdmmc mmc_core aesni_intel aes_x86_64 crypto_simd glue_helper cryptd ahci libahci xhci_pci psmouse rtsx_pci xhci_hcd r8169 libata i2c_i801 mii scsi_mod usbcore usb_common thermal [last unloaded: cfg80211] [ 257.360139] CPU: 0 PID: 162 Comm: kworker/0:2 Not tainted 4.16.0-1-amd64 #1 Debian 4.16.5-1 [ 257.360140] Hardware name: HP HP Pavilion x360 Convertible/80D1, BIOS F.25 02/26/2018 [ 257.360147] Workqueue: rtl8723be_pci rtl_c2hcmd_wq_callback [rtlwifi] [ 257.360151] RIP: 0010:__list_del_entry_valid+0x73/0x90 [ 257.360153] RSP: 0018:ffffaa25c10b3d68 EFLAGS: 00010086 [ 257.360155] RAX: 0000000000000054 RBX: 0000000000000000 RCX: 0000000000000000 [ 257.360156] RDX: 0000000000000000 RSI: ffff9619aec16738 RDI: ffff9619aec16738 [ 257.360158] RBP: ffff96199fc2e2e0 R08: 0000000000000398 R09: 0000000000000004 [ 257.360159] R10: 0000000000000000 R11: ffffffff979a8dcd R12: ffff96199fc2e2d8 [ 257.360161] R13: ffff96199fc2e2e8 R14: ffffaa25c10b3d88 R15: ffff96199fc2e2e8 [ 257.360162] FS: 0000000000000000(0000) GS:ffff9619aec00000(0000) knlGS:0000000000000000 [ 257.360164] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 257.360165] CR2: 000055c533d45808 CR3: 0000000118e0a006 CR4: 00000000003606f0 [ 257.360167] Call Trace: [ 257.360171] wait_for_completion_timeout+0x155/0x1a0 [ 257.360175] ? wake_up_q+0x70/0x70 [ 257.360181] halbtc_send_bt_mp_operation.constprop.19+0x81/0x90 [btcoexist] [ 257.360185] halbtc_set_bt_reg+0x4a/0x90 [btcoexist] [ 257.360189] ex_btc8723b1ant_bt_info_notify+0x2d1/0x6d0 [btcoexist] [ 257.360193] rtl_c2hcmd_launcher+0xbb/0x120 [rtlwifi] [ 257.360196] process_one_work+0x17b/0x360 [ 257.360200] worker_thread+0x2e/0x390 [ 257.360202] ? process_one_work+0x360/0x360 [ 257.360204] kthread+0x113/0x130 [ 257.360207] ? kthread_create_worker_on_cpu+0x70/0x70 [ 257.360209] ? kthread_create_worker_on_cpu+0x70/0x70 [ 257.360211] ret_from_fork+0x35/0x40 [ 257.360213] Code: 97 e8 9c c9 d3 ff 0f 0b 48 89 fe 48 c7 c7 28 df 25 97 e8 8b c9 d3 ff 0f 0b 48 89 f2 48 89 fe 48 c7 c7 60 df 25 97 e8 77 c9 d3 ff <0f> 0b 48 c7 c7 a0 df 25 97 e8 69 c9 d3 ff 0f 0b 90 90 90 90 90 [ 257.360241] RIP: __list_del_entry_valid+0x73/0x90 RSP: ffffaa25c10b3d68 [ 257.360243] ---[ end trace 89b4b0ea883f4120 ]--- [ 10.828074] BUG: unable to handle kernel paging request at ffffffffad802660 [ 10.828104] IP: native_queued_spin_lock_slowpath+0x161/0x190 [ 10.828121] PGD 17600e067 P4D 17600e067 PUD 17600f063 PMD 1754000e1 [ 10.828141] Oops: 0003 [#1] SMP PTI [ 10.828154] Modules linked in: 8021q garp mrp stp llc cmac snd_hrtimer snd_seq snd_seq_device bnep nls_ascii nls_cp437 vfat fat wmi_bmof hp_wmi snd_hda_codec_hdmi intel_rapl x86_pkg_temp_thermal intel_powerclamp snd_hda_codec_realtek arc4 coretemp snd_hda_codec_generic kvm_intel kvm rtl8723be irqbypass btcoexist snd_soc_skl intel_cstate btusb snd_soc_skl_ipc btrtl rtl8723_common btbcm snd_hda_ext_core btintel snd_soc_sst_dsp rtl_pci bluetooth efi_pstore intel_uncore snd_soc_sst_ipc snd_soc_acpi intel_rapl_perf rtlwifi pcspkr snd_soc_core uvcvideo snd_compress serio_raw hid_sensor_gyro_3d hid_sensor_accel_3d hid_sensor_rotation i915 mac80211 hid_sensor_magn_3d hid_sensor_incl_3d evdev videobuf2_vmalloc joydev hid_sensor_trigger snd_hda_intel videobuf2_memops hid_sensor_iio_common industrialio_triggered_buffer [ 10.828362] videobuf2_v4l2 efivars kfifo_buf industrialio snd_hda_codec drbg videobuf2_common cfg80211 ansi_cprng hid_multitouch snd_hda_core videodev snd_hwdep media ecdh_generic rtsx_pci_ms intel_th_gth snd_pcm drm_kms_helper snd_timer snd idma64 rfkill mei_me memstick intel_th_pci intel_th soundcore iTCO_wdt sg drm iTCO_vendor_support mei intel_lpss_pci i2c_algo_bit intel_lpss processor_thermal_device shpchp intel_pch_thermal intel_soc_dts_iosf wmi int3403_thermal soc_button_array int340x_thermal_zone ac intel_vbtn battery sparse_keymap video tpm_crb tpm_tis tpm_tis_core int3400_thermal tpm rng_core acpi_thermal_rel hp_wireless acpi_pad button sunrpc efivarfs ip_tables x_tables autofs4 ext4 crc16 mbcache jbd2 fscrypto ecb algif_skcipher af_alg hid_sensor_custom hid_sensor_hub hid_generic usbhid [ 10.828567] hid dm_crypt dm_mod raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c crc32c_generic raid1 raid0 multipath linear md_mod sd_mod crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel pcbc rtsx_pci_sdmmc mmc_core aesni_intel aes_x86_64 crypto_simd glue_helper cryptd ahci libahci xhci_pci rtsx_pci i2c_i801 xhci_hcd psmouse libata r8169 mii usbcore scsi_mod usb_common thermal [ 10.828684] CPU: 0 PID: 510 Comm: kworker/0:3 Not tainted 4.16.0-1-amd64 #1 Debian 4.16.5-1 [ 10.828708] Hardware name: HP HP Pavilion x360 Convertible/80D1, BIOS F.25 02/26/2018 [ 10.828734] Workqueue: rtl8723be_pci rtl_c2hcmd_wq_callback [rtlwifi] [ 10.828755] RIP: 0010:native_queued_spin_lock_slowpath+0x161/0x190 [ 10.828773] RSP: 0018:ffffa43641517d60 EFLAGS: 00010086 [ 10.828789] RAX: ffffffffad802660 RBX: 0000000000000000 RCX: ffff89bdaec22480 [ 10.828810] RDX: 000000000000191c RSI: 000000006474e550 RDI: ffff89bda2fe7ae0 [ 10.828830] RBP: ffff89bda2fe7ae0 R08: 0000000000040000 R09: 0000000000000000 [ 10.828850] R10: 0000000000000000 R11: 0000000000000ed1 R12: ffff89bda2fe7ad8 [ 10.828870] R13: ffff89bda2fe7ae8 R14: ffffa43641517d88 R15: ffff89bda2fe7ae8 [ 10.828891] FS: 0000000000000000(0000) GS:ffff89bdaec00000(0000) knlGS:0000000000000000 [ 10.828914] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 10.828942] CR2: ffffffffad802660 CR3: 000000017600a003 CR4: 00000000003606f0 [ 10.828974] Call Trace: [ 10.828986] _raw_spin_lock_irq+0x24/0x27 [ 10.829001] wait_for_completion_timeout+0x143/0x1a0 [ 10.829019] ? wake_up_q+0x70/0x70 [ 10.829034] halbtc_send_bt_mp_operation.constprop.19+0x81/0x90 [btcoexist] [ 10.829056] halbtc_set_bt_reg+0x4a/0x90 [btcoexist] [ 10.829073] ex_btc8723b1ant_bt_info_notify+0x2d1/0x6d0 [btcoexist] [ 10.829094] rtl_c2hcmd_launcher+0xbb/0x120 [rtlwifi] [ 10.829112] process_one_work+0x17b/0x360 [ 10.829126] worker_thread+0x2e/0x390 [ 10.829139] ? process_one_work+0x360/0x360 [ 10.829156] kthread+0x113/0x130 [ 10.829168] ? kthread_create_worker_on_cpu+0x70/0x70 [ 10.829184] ret_from_fork+0x35/0x40 [ 10.829198] Code: c3 f3 90 4c 8b 09 4d 85 c9 74 f6 eb d2 c1 ea 12 83 e0 03 83 ea 01 48 c1 e0 04 48 63 d2 48 05 80 24 02 00 48 03 04 d5 40 e4 2a ae <48> 89 08 8b 41 08 85 c0 75 09 f3 90 8b 41 08 85 c0 74 f7 4c 8b [ 10.829271] RIP: native_queued_spin_lock_slowpath+0x161/0x190 RSP: ffffa43641517d60 [ 10.830709] CR2: ffffffffad802660 [ 10.832164] ---[ end trace 80c173d404c136d4 ]--- [ 10.687183] ------------[ cut here ]------------ [ 10.687185] rtl8723be: error H2C cmd because of Fw download fail!!! [ 10.687273] WARNING: CPU: 0 PID: 34 at drivers/net/wireless/realtek/rtlwifi/rtl8723be/fw.c:227 rtl8723be_fill_h2c_cmd+0x103/0x400 [rtl8723be] [ 10.687275] Modules linked in: 8021q garp mrp stp llc cmac snd_hrtimer snd_seq snd_seq_device bnep nls_ascii nls_cp437 vfat fat snd_hda_codec_hdmi intel_rapl arc4 x86_pkg_temp_thermal intel_powerclamp snd_hda_codec_realtek snd_hda_codec_generic wmi_bmof hp_wmi coretemp snd_soc_skl rtl8723be snd_soc_skl_ipc kvm_intel btcoexist snd_hda_ext_core rtl8723_common snd_soc_sst_dsp rtl_pci snd_soc_sst_ipc rtlwifi snd_soc_acpi kvm snd_soc_core irqbypass snd_compress intel_cstate mac80211 efi_pstore snd_hda_intel intel_uncore intel_rapl_perf snd_hda_codec joydev intel_th_gth evdev snd_hda_core btusb btrtl btbcm intel_th_pci iTCO_wdt btintel snd_hwdep intel_th bluetooth snd_pcm iTCO_vendor_support serio_raw efivars snd_timer pcspkr rtsx_pci_ms snd cfg80211 soundcore i915 memstick hid_multitouch drbg hid_sensor_accel_3d [ 10.687370] uvcvideo ansi_cprng hid_sensor_gyro_3d drm_kms_helper hid_sensor_rotation hid_sensor_magn_3d videobuf2_vmalloc hid_sensor_incl_3d sg videobuf2_memops videobuf2_v4l2 hid_sensor_trigger videobuf2_core hid_sensor_iio_common idma64 ecdh_generic drm videodev processor_thermal_device industrialio_triggered_buffer kfifo_buf mei_me industrialio media rfkill intel_lpss_pci i2c_algo_bit mei intel_soc_dts_iosf shpchp intel_lpss intel_pch_thermal wmi int3403_thermal soc_button_array int340x_thermal_zone ac battery intel_vbtn sparse_keymap tpm_crb tpm_tis video tpm_tis_core tpm int3400_thermal acpi_thermal_rel hp_wireless acpi_pad button sunrpc efivarfs ip_tables x_tables autofs4 ext4 crc16 mbcache jbd2 fscrypto algif_skcipher af_alg hid_sensor_custom hid_sensor_hub usbhid hid dm_crypt dm_mod raid10 [ 10.687457] raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c crc32c_generic raid1 raid0 multipath linear md_mod sd_mod crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel pcbc rtsx_pci_sdmmc mmc_core aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse ahci libahci xhci_pci i2c_i801 rtsx_pci libata r8169 mii xhci_hcd scsi_mod usbcore thermal [ 10.687514] CPU: 0 PID: 34 Comm: kworker/0:1 Not tainted 4.15.0-874e837d67d0+ #17 [ 10.687516] Hardware name: HP HP Pavilion x360 Convertible/80D1, BIOS F.25 02/26/2018 [ 10.687530] Workqueue: rtl8723be_pci rtl_c2hcmd_wq_callback [rtlwifi] [ 10.687541] RIP: 0010:rtl8723be_fill_h2c_cmd+0x103/0x400 [rtl8723be] [ 10.687544] RSP: 0018:ffffaf1100e0bdb0 EFLAGS: 00010286 [ 10.687548] RAX: 0000000000000000 RBX: ffffffffc12df9a0 RCX: 0000000000000006 [ 10.687551] RDX: 0000000000000007 RSI: 0000000000000082 RDI: ffff9249aec0ee70 [ 10.687553] RBP: 0000000000000000 R08: 0000000000000388 R09: 0000000000000004 [ 10.687555] R10: 00000000000001d0 R11: 0000000000000001 R12: ffff92499d301500 [ 10.687557] R13: 0000000000000000 R14: dead000000000100 R15: 0000000000000001 [ 10.687561] FS: 0000000000000000(0000) GS:ffff9249aec00000(0000) knlGS:0000000000000000 [ 10.687563] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 10.687566] CR2: 000055b4818242d0 CR3: 0000000214009004 CR4: 00000000003606f0 [ 10.687568] Call Trace: [ 10.687585] ex_btc8723b1ant_bt_info_notify+0x369/0x690 [btcoexist] [ 10.687597] rtl_c2hcmd_launcher+0xb8/0x120 [rtlwifi] [ 10.687606] process_one_work+0x188/0x380 [ 10.687612] worker_thread+0x2e/0x390 [ 10.687618] ? process_one_work+0x380/0x380 [ 10.687622] kthread+0x111/0x130 [ 10.687626] ? kthread_create_worker_on_cpu+0x70/0x70 [ 10.687632] ret_from_fork+0x1f/0x30 [ 10.687637] Code: 41 80 bc 24 6c 08 00 00 00 75 c9 48 89 c6 48 89 ef e8 72 de fb f1 eb a9 48 c7 c7 90 b7 0f c1 c6 05 52 34 01 00 01 e8 2d 9c 98 f1 <0f> ff e9 3a ff ff ff 48 89 c6 41 c6 84 24 6c 08 00 00 01 48 89 [ 10.687719] ---[ end trace 127c675f3a6f944e ]---
