The booting process blocked in 6.5.0-25 during systemd-resolve start phase

[François Bobot]

Since booting in 6.5.0-25-generic some kworker thread were stuck. This problem with iwlwifi was new. Booting back in 6.5.0-21-generic solved the problem.

This was a suspicious new error:

```
kernel: iwlwifi 0000:3b:00.0: Error sending MCC_UPDATE_CMD: time out after 2000ms.
kernel: iwlwifi 0000:3b:00.0: Current CMD queue read_ptr 16 write_ptr 17
kernel: iwlwifi 0000:3b:00.0: DEVICE_ENABLED bit is not set. Aborting dump.
kernel: iwlwifi 0000:3b:00.0: Queue 0 is active on fifo 7 and stuck for 2500 ms. SW [16, 17] HW [17, 17] FH TRB=0x0700010
```

example of blocked kworkers:

```
kernel: INFO: task kworker/0:1:9 blocked for more than 120 seconds.
kernel: Not tainted 6.5.0-25-generic #25-Ubuntu
kernel: task:kworker/0:1 state:D stack:0 pid:9 ppid:2 flags:0x00004000
kernel: Workqueue: events cfg80211_rfkill_block_work [cfg80211]
```

```
kernel: INFO: task irq/173-iwlwifi:945 blocked for more than 120 seconds.
kernel: task:irq/173-iwlwifi state:D stack:0 pid:945 ppid:2 flags:0x00004000
```

```
kernel: INFO: task modprobe:947 blocked for more than 120 seconds.
kernel: Not tainted 6.5.0-25-generic #25-Ubuntu
kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kernel: task:modprobe state:D stack:0 pid:947 ppid:583 flags:0x00004002

```

```
kernel: INFO: task kworker/u32:10:1016 blocked for more than 120 seconds.
kernel: task:kworker/u32:10 state:D stack:0 pid:1016 ppid:2 flags:0x00004000
kernel: Workqueue: events_power_efficient reg_check_chans_work [cfg80211]
```

```
kernel: INFO: task systemd-resolve:1093 blocked for more than 120 seconds.
kernel: task:systemd-resolve state:D stack:0 pid:1093 ppid:1 flags:0x00000006
```

ProblemType: Bug
DistroRelease: Ubuntu 23.10
Package: linux-modules-extra-6.5.0-25-generic 6.5.0-25.25
ProcVersionSignature: Ubuntu 6.5.0-21.21-generic 6.5.8
Uname: Linux 6.5.0-21-generic x86_64
ApportVersion: 2.27.0-0ubuntu5
Architecture: amd64
CRDA: N/A
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Mon Mar 11 11:41:51 2024
Dependencies:
 linux-modules-6.5.0-25-generic 6.5.0-25.25
 wireless-regdb 2022.06.06-0ubuntu2
EcryptfsInUse: Yes
InstallationDate: Installed on 2020-10-21 (1237 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
MachineType: {report['dmi.sys.vendor']} {report['dmi.product.name']}
ProcEnviron:
 LANG=fr_FR.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/zsh
 XDG_RUNTIME_DIR=<set>
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-6.5.0-21-generic root=/dev/mapper/vgubuntu-root ro quiet splash
RelatedPackageVersions:
 linux-restricted-modules-6.5.0-21-generic N/A
 linux-backports-modules-6.5.0-21-generic N/A
 linux-firmware 20230919.git3672ccab-0ubuntu2.5
SourcePackage: linux
UpgradeStatus: Upgraded to mantic on 2023-11-13 (119 days ago)
dmi.bios.date: 10/11/2021
dmi.bios.release: 1.14
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.14.1
dmi.board.name: 024X86
dmi.board.vendor: Dell Inc.
dmi.board.version: A04
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.14.1:bd10/11/2021:br1.14:svnDellInc.:pnPrecision5540:pvr:rvnDellInc.:rn024X86:rvrA04:cvnDellInc.:ct10:cvr:sku0906:
dmi.product.family: Precision
dmi.product.name: Precision 5540
dmi.product.sku: 0906
dmi.sys.vendor: Dell Inc.

[François Bobot (francois-6)]

It was not fixed in 6.5.0-26 but it seems solved in 6.5.0-27.