Public bug reported:
---Problem Description---
Kernel crash when setting up ramdisk on embedded ARM
Contact Information = Chris Ward [email protected] Mohit Kapur
[email protected]
---Additional Hardware Info---
Embedded ARM with FPGA
---uname output---
Linux cuttlefisharm1 5.4.0-xilinx-v2020.2 #1 SMP Thu Nov 18 18:44:45 UTC 2021
aarch64 aarch64 aarch64 GNU/Linux
Machine Type = IBM Research internal processor based on xilinx
---System Hang---
Unresponsive. Power cycle reclaims
---Debugger---
A debugger is not configured
---Steps to Reproduce---
Boot the system. Try dd if=/dev/zero of=/dev/ram0 bs=... count=...
A small ramdisk works and gives the expected error when trying to write 8G of
data into an 8M ramdisk.
tjcw@cuttlefisharm1:~$ sudo dd if=/dev/zero of=/dev/ram0 bs=4096 count=1048576
[sudo] password for tjcw:
dd: error writing '/dev/ram0': No space left on device
2049+0 records in
2048+0 records out
8388608 bytes (8.4 MB, 8.0 MiB) copied, 0.0531788 s, 158 MB/s
tjcw@cuttlefisharm1:~$
A 2GB ramdisk works, a 4GB ramdisk causes a crash
** Affects: kernel-package (Ubuntu)
Importance: Undecided
Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
Status: New
** Tags: architecture-other bugnameltc-195473 severity-medium
targetmilestone-inin---
** Tags added: architecture-other bugnameltc-195473 severity-medium
targetmilestone-inin---
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https://bugs.launchpad.net/bugs/1952185
Title:
Embedded ARM64 crash trying to zero-fill an 8GB ramdisk
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