$ git bisect log
git bisect start
# old: [bcf876870b95592b52519ed4aafcf9d95999bc9c] Linux 5.8
git bisect old bcf876870b95592b52519ed4aafcf9d95999bc9c
# new: [9123e3a74ec7b934a4a099e98af6a61c2f80bbf5] Linux 5.9-rc1
git bisect new 9123e3a74ec7b934a4a099e98af6a61c2f80bbf5
# old: [8186749621ed6b8fc42644c399e8c755a2b6f630] Merge tag 
'drm-next-2020-08-06' of git://anongit.freedesktop.org/drm/drm
git bisect old 8186749621ed6b8fc42644c399e8c755a2b6f630
# new: [912c05720f00d039103d356a59c37dc7c3995e01] mm: vmscan: consistent update 
to pgrefill
git bisect new 912c05720f00d039103d356a59c37dc7c3995e01
# new: [6f3de75cdf60c1b859bc8c1904d25889c00d7bbe] Merge tag 
'mac80211-next-for-davem-2020-07-31' of 
git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next
git bisect new 6f3de75cdf60c1b859bc8c1904d25889c00d7bbe
# old: [bd69058f50d5ffa659423bcfa6fe6280ce9c760a] net: ll_temac: Use 
devm_platform_ioremap_resource_byname()
git bisect old bd69058f50d5ffa659423bcfa6fe6280ce9c760a
# new: [0eee35bdfa3b472cc986ecc6ad76293fdcda59e2] Bluetooth: Update resolving 
list when updating whitelist
git bisect new 0eee35bdfa3b472cc986ecc6ad76293fdcda59e2
# old: [76b139965575e51224d33ea721d9d00a542b6b39] Bluetooth: Terminate the link 
if pairing is cancelled
git bisect old 76b139965575e51224d33ea721d9d00a542b6b39
# old: [51b64c476a5ddc66d3459f14e98e5de9211e9e24] Bluetooth: Use whitelist for 
scan policy when suspending
git bisect old 51b64c476a5ddc66d3459f14e98e5de9211e9e24
# old: [37adf701dd8790fd019c513b7a892d7178170338] Bluetooth: Add per-instance 
adv disable/remove
git bisect old 37adf701dd8790fd019c513b7a892d7178170338
# old: [202798db9570104728dce8bb57dfeed47ce764bc] Bluetooth: hci_serdev: Only 
unregister device if it was registered
git bisect old 202798db9570104728dce8bb57dfeed47ce764bc
# old: [58789a1990c1a849a461ac912e72a698a771951a] Bluetooth: hci_qca: Stop 
collecting memdump again for command timeout during SSR
git bisect old 58789a1990c1a849a461ac912e72a698a771951a
# old: [e1d572357599d142df5764b39731b6eb55a22beb] Bluetooth: Configure 
controller address resolution if available
git bisect old e1d572357599d142df5764b39731b6eb55a22beb
# first new commit: [0eee35bdfa3b472cc986ecc6ad76293fdcda59e2] Bluetooth: 
Update resolving list when updating whitelist

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https://bugs.launchpad.net/bugs/1909450

Title:
  bluetooth failed to reconnect a previously paired device after
  airplane mode

Status in linux package in Ubuntu:
  Confirmed
Status in linux-oem-5.10 package in Ubuntu:
  Invalid
Status in linux source package in Focal:
  Invalid
Status in linux-oem-5.10 source package in Focal:
  Confirmed
Status in linux source package in Hirsute:
  Confirmed
Status in linux-oem-5.10 source package in Hirsute:
  Invalid

Bug description:
  Starting from v5.9-rc1, kernel initiated passive scan maybe
  interrupted immediately after enabled by a bluez initiated active
  scan, which results in no public owning address typed adv report event
  being received, and therefore no way to reconnect a previously paired
  device, which will listen to passive scan at that time. Example
  btsnoop log can be found:

  < HCI Command: LE Set Extended S.. (0x08|0x0041) plen 8  #1120 [hci0] 
33.537423
          Own address type: Public (0x00)
          Filter policy: Ignore not in white list (0x01)
          PHYs: 0x01
          Entry 0: LE 1M
            Type: Passive (0x00)
            Interval: 60.000 msec (0x0060)
            Window: 30.000 msec (0x0030)
  > HCI Event: Command Complete (0x0e) plen 4              #1121 [hci0] 
33.538323
        LE Set Extended Scan Parameters (0x08|0x0041) ncmd 1
          Status: Success (0x00)
  < HCI Command: LE Set Extended S.. (0x08|0x0042) plen 6  #1122 [hci0] 
33.538363
          Extended scan: Enabled (0x01)
          Filter duplicates: Enabled (0x01)
          Duration: 0 msec (0x0000)
          Period: 0.00 sec (0x0000)
  > HCI Event: Command Complete (0x0e) plen 4              #1123 [hci0] 
33.540331
        LE Set Extended Scan Enable (0x08|0x0042) ncmd 2
          Status: Success (0x00)
  @ MGMT Command: Start Service Disc.. (0x003a) plen 4  {0x0001} [hci0] 
33.960088
          Address type: 0x07
            BR/EDR
            LE Public
            LE Random
          RSSI: invalid (0x7f)
          UUIDs: 0
  < HCI Command: LE Set Extended S.. (0x08|0x0042) plen 6  #1124 [hci0] 
33.960225
          Extended scan: Disabled (0x00)
          Filter duplicates: Disabled (0x00)
          Duration: 0 msec (0x0000)
          Period: 0.00 sec (0x0000)
  > HCI Event: Command Complete (0x0e) plen 4              #1125 [hci0] 
33.963335
        LE Set Extended Scan Enable (0x08|0x0042) ncmd 2
          Status: Success (0x00)
  < HCI Command: LE Set Random Add.. (0x08|0x0005) plen 6  #1126 [hci0] 
33.963415
          Address: 35:88:64:2F:21:A2 (Non-Resolvable)
  > HCI Event: Command Complete (0x0e) plen 4              #1127 [hci0] 
33.965548
        LE Set Random Address (0x08|0x0005) ncmd 1
          Status: Success (0x00)
  < HCI Command: LE Set Extended S.. (0x08|0x0041) plen 8  #1128 [hci0] 
33.965623
          Own address type: Random (0x01)
          Filter policy: Accept all advertisement (0x00)
          PHYs: 0x01
          Entry 0: LE 1M
            Type: Active (0x01)
            Interval: 22.500 msec (0x0024)
            Window: 11.250 msec (0x0012)
  > HCI Event: Command Complete (0x0e) plen 4              #1129 [hci0] 
33.966501
        LE Set Extended Scan Parameters (0x08|0x0041) ncmd 1
          Status: Success (0x00)
  < HCI Command: LE Set Extended S.. (0x08|0x0042) plen 6  #1130 [hci0] 
33.966560
          Extended scan: Enabled (0x01)
          Filter duplicates: Enabled (0x01)
          Duration: 0 msec (0x0000)
          Period: 0.00 sec (0x0000)
  > HCI Event: Command Complete (0x0e) plen 4              #1131 [hci0] 
33.967291
        LE Set Extended Scan Enable (0x08|0x0042) ncmd 2
          Status: Success (0x00)
  < HCI Command: Inquiry (0x01|0x0001) plen 5              #1132 [hci0] 
33.967305
          Access code: 0x9e8b33 (General Inquiry)
          Length: 10.24s (0x08)
          Num responses: 0
  > HCI Event: Command Status (0x0f) plen 4                #1133 [hci0] 
33.968266
        Inquiry (0x01|0x0001) ncmd 2
          Status: Success (0x00)
  @ MGMT Event: Command Complete (0x0001) plen 4        {0x0001} [hci0] 
33.968484
        Start Service Discovery (0x003a) plen 1
          Status: Success (0x00)
          Address type: 0x07
            BR/EDR
            LE Public
            LE Random

  ProblemType: Bug
  DistroRelease: Ubuntu 21.04
  Package: bluetooth (not installed)
  Uname: Linux 5.9.0-050900rc1-generic x86_64
  ApportVersion: 2.20.11-0ubuntu55
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Dec 28 03:01:16 2020
  InstallationDate: Installed on 2020-09-14 (105 days ago)
  InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
  InterestingModules: rfcomm bnep btusb bluetooth
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 0c45:6715 Microdia Integrated_Webcam_HD
   Bus 001 Device 002: ID 04f3:0c01 Elan Microelectronics Corp. ELAN:Fingerprint
   Bus 001 Device 004: ID 8087:0025 Intel Corp. Wireless-AC 9260 Bluetooth 
Adapter
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Dell Inc. Inspiron 7380
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.9.0-050900rc1-generic 
root=UUID=944d91f1-e71c-44ef-8c76-76a0bdd22bf5 ro quiet splash vt.handoff=7
  SourcePackage: bluez
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/08/2018
  dmi.bios.release: 1.1
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.1.0
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 10
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.1.0:bd08/08/2018:br1.1:svnDellInc.:pnInspiron7380:pvr:rvnDellInc.:rn:rvr:cvnDellInc.:ct10:cvr:
  dmi.product.family: Inspiron
  dmi.product.name: Inspiron 7380
  dmi.product.sku: 08A5
  dmi.sys.vendor: Dell Inc.
  hciconfig:
   hci0:        Type: Primary  Bus: USB
        BD Address: 94:B8:6D:F8:8A:67  ACL MTU: 1021:4  SCO MTU: 96:6
        UP RUNNING PSCAN ISCAN INQUIRY 
        RX bytes:155124 acl:178 sco:0 events:3124 errors:0
        TX bytes:10259 acl:53 sco:0 commands:972 errors:0

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