From c28271887bcb0def12c6d568a3b474a75c6e4e3c Mon Sep 17 00:00:00 2001
From: Sonic Build Admin <sonicbld@microsoft.com>
Date: Wed, 4 Jun 2025 12:51:12 +0000
Subject: [PATCH] [build] Fix kdump build failure (Fixes 5097 17023)

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#### Why I did it

The build fails if kdump is enabled on the build host, even though the relevant build step is performed in a dockerized chroot.

```
+ sudo LANG=C chroot ./fsroot-cisco-8000 kdump-config symlinks 5.10.0-23-2-amd64
Cannot change symbolic links when kdump is loaded ... failed!
```

Fixes #5097, Fixes #17023

##### Work item tracking
- Microsoft ADO **(number only)**:

#### How I did it

kdump installation checks if kdump is already running and aborts if so. This is good in most cases, but it's not relevant when installing into a chroot inside a docker container. This adds a basic patch to disable this check during build.

Note that the kdump status of the build host is imported into the docker build container via the sysfs file system:

```
$ ls -id /sys/kernel/kexec_crash_loaded && cat /sys/kernel/kexec_crash_loaded
7824 /sys/kernel/kexec_crash_loaded
0

$ docker run --rm debian bash -c "ls -id /sys/kernel/kexec_crash_loaded && cat /sys/kernel/kexec_crash_loaded"
7824 /sys/kernel/kexec_crash_loaded
0
```

The inodes and file content are identical inside and outside of the container.

#### How to verify it

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1. Enable kdump on the build host
2. Confirm baseline build fails with the "Cannot change symbolic links when kdump is loaded" error
3. Apply this change and build succeeds

#### Which release branch to backport (provide reason below if selected)

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- [x] 202006
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- [x] 202405
- [x] 202411
- [x] 202505

#### Tested branch (Please provide the tested image version)

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- [x] 20201231.100
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master (29752056ef87ace404d073901cba6179ab074a12)

#### Description for the changelog
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pull request for inclusion in the changelog:
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[build] fix build failure on kdump-enabled hosts

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#### A picture of a cute animal (not mandatory but encouraged)
---
 src/kdump-tools/patch/series | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/kdump-tools/patch/series b/src/kdump-tools/patch/series
index 0af2c976020..369545368bc 100644
--- a/src/kdump-tools/patch/series
+++ b/src/kdump-tools/patch/series
@@ -1,2 +1,3 @@
 0002-core-file-prefixed-by-kdump.patch
 0003-Revert-the-MODULES-dep-optimization.patch
+0004-disable-kdump-load-check.patch