dmesg output following kernel panic with pci failing...
[ 0.590299] brcm-pcie fd500000.pcie: link down
Line 120: [ 0.094533] platform fd500000.pcie: Fixed dependency
cycle(s) with /scb/pcie@7d500000
Line 160: [ 0.227727] PCI: CLS 0 bytes, default 64
Line 177: [ 0.339913] brcm-pcie fd500000.pcie: host bridge
/scb/pcie@7d500000 ranges:
Line 178: [ 0.339985] brcm-pcie fd500000.pcie: No bus range found
for /scb/pcie@7d500000, using [bus 00-ff]
Line 179: [ 0.340077] brcm-pcie fd500000.pcie: MEM
0x0600000000..0x063fffffff -> 0x00c0000000
Line 180: [ 0.340172] brcm-pcie fd500000.pcie: IB MEM
0x0000000000..0x007fffffff -> 0x0400000000
Line 181: [ 0.341474] brcm-pcie fd500000.pcie: PCI host bridge to
bus 0000:00
Line 182: [ 0.341534] pci_bus 0000:00: root bus resource [bus 00-ff]
Line 183: [ 0.341567] pci_bus 0000:00: root bus resource [mem
0x600000000-0x63fffffff] (bus address [0xc0000000-0xffffffff])
Line 184: [ 0.341792] pci 0000:00:00.0: [14e4:2711] type 01 class
0x060400 PCIe Root Port
Line 185: [ 0.341872] pci 0000:00:00.0: PCI bridge to [bus 00]
Line 186: [ 0.341909] pci 0000:00:00.0: bridge window [mem
0x00000000-0x000fffff]
Line 187: [ 0.341952] pci 0000:00:00.0: bridge window [mem
0x00000000-0x000fffff 64bit pref]
Line 188: [ 0.342122] pci 0000:00:00.0: PME# supported from D0 D3hot
Line 189: [ 0.346323] pci 0000:00:00.0: bridge configuration invalid
([bus 00-00]), reconfiguring
Line 190: [ 0.346673] pci_bus 0000:01: supply vpcie3v3 not found,
using dummy regulator
Line 191: [ 0.346881] pci_bus 0000:01: supply vpcie3v3aux not found,
using dummy regulator
Line 192: [ 0.346990] pci_bus 0000:01: supply vpcie12v not found,
using dummy regulator
Line 193: [ 0.590299] brcm-pcie fd500000.pcie: link down
Line 194: [ 0.590642] pci_bus 0000:01: busn_res: [bus 01-ff] end is
updated to 01
Line 195: [ 0.590703] pci 0000:00:00.0: PCI bridge to [bus 01]
Line 196: [ 0.590749] pci_bus 0000:00: resource 4 [mem
0x600000000-0x63fffffff]
Line 197: [ 0.591562] pcieport 0000:00:00.0: PME: Signaling with IRQ
27
Line 198: [ 0.592134] pcieport 0000:00:00.0: AER: enabled with IRQ 27
Line 199: [ 0.593033] pci_bus 0000:01: busn_res: [bus 01] is released
Line 200: [ 0.593911] pci_bus 0000:00: busn_res: [bus 00-ff] is
released
** Attachment added: "dmesg output following kernel panic with pci failing to
initialize"
https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/2099935/+attachment/5860223/+files/ubuntu_dmesg_not_working.txt
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https://bugs.launchpad.net/bugs/2099935
Title:
PCI initialization failure following kernel panic reboot on Raspberry
Pi CM4
Status in linux package in Ubuntu:
New
Bug description:
Ubuntu Server 24.10
Linux ubuntu 6.11.0-1004-raspi #4-Ubuntu SMP PREEMPT_DYNAMIC Fri Sep 27
22:25:34 UTC 2024 aarch64 aarch64 aarch64 GNU/Linux
We're seeing that following a kernel panic and reboot, the PCI fails
to initialize correctly and associated devices (such as Wi-Fi card)
are not available.
Issue Description:
• On the first boot, everything works correctly.
• However, after a Kernel Panic, the device reboots, but PCIe does not
reset or re-initialize properly.
• When this happens:
o The Wi-Fi card is not recognized.
o The lspci command shows no PCI devices.
o The dmesg log includes the message:
[ 0.591441] brcm-pcie fd500000.pcie: link down
• A soft reboot does not fix the issue.
• The only way to recover is to completely remove and reconnect power
(hard reboot).
We have tried modifying /boot/firmware/config.txt and
/boot/firmware/cmdline.txt, which has reduced but not fully resolved the issue.
How to Reproduce The Problem:
1. Power up the hardware
2. Run ‘lspci’ – observe the result includes the PCI Bridge and Wi-Fi card
3. Trigger a kernel panic with the command ‘echo c | sudo tee
/proc/sysrq-trigger’, causing a reboot
4. Run ‘lspci’ – observer the output is now empty
The same issue does not occur on Raspberry Pi OS - it seems to be specific to
Ubuntu.
Any assistance/guidance on how to troubleshoot this would be much
appreciated!
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