init/initramfs_test: wait_for_initramfs() before running

initramfs_test_extract() and friends call unpack_to_rootfs() from a
kunit kthread while do_populate_rootfs() may still be running
asynchronously from rootfs_initcall. unpack_to_rootfs() keeps its
parser state in module-static variables (victim, byte_count, state,
this_header, header_buf, name_buf, ...), so the two writers corrupt
each other.

On arm64 v7.0-rc5+ this oopses early in boot:

  Unable to handle kernel paging request at virtual address ffff80018f9f0ffc
  pc : do_reset+0x3c/0x98
  Call trace:
   do_reset
   initramfs_test_extract
   kunit_try_run_case
  Initramfs unpacking failed: junk within compressed archive

do_reset() faults because 'victim' was overwritten by the boot-time
unpacker; the boot unpacker meanwhile logs the bogus "junk within
compressed archive" on the real initrd because the test wrecked its
state machine.

Add a .suite_init callback that calls wait_for_initramfs() so the async
unpack is quiescent before the first case runs. suite_init runs once per
suite rather than before every individual test case.

Fixes: 83c0b27266ec ("initramfs_test: kunit tests for initramfs unpacking")
Signed-off-by: Jia He <justin.he@arm.com>
Link: https://patch.msgid.link/20260519093937.1064628-1-justin.he@arm.com
Reviewed-by: David Disseldorp <ddiss@suse.de>
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

1 files changed, 16 insertions, 1 deletions

diff --git a/init/initramfs_test.c b/init/initramfs_test.c
index 8a0ddc2db2c0..bc55306d226d 100644
--- a/init/initramfs_test.c
+++ b/init/initramfs_test.c
@@ -3,7 +3,9 @@
 #include <linux/fcntl.h>
 #include <linux/file.h>
 #include <linux/fs.h>
+#include <linux/init.h>
 #include <linux/init_syscalls.h>
+#include <linux/initrd.h>
 #include <linux/stringify.h>
 #include <linux/timekeeping.h>
 #include "initramfs_internal.h"
@@ -560,8 +562,21 @@ static struct kunit_case __refdata initramfs_test_cases[] = {
 	{},
 };
 
-static struct kunit_suite initramfs_test_suite = {
+static int __init initramfs_test_init(struct kunit_suite *suite)
+{
+	/*
+	 * unpack_to_rootfs() uses module-static state (victim, byte_count,
+	 * state, ...). The boot-time async do_populate_rootfs() may still be
+	 * running, so wait for it to finish before we call unpack_to_rootfs()
+	 * from the test thread, otherwise the two writers race and crash.
+	 */
+	wait_for_initramfs();
+	return 0;
+}
+
+static struct kunit_suite __refdata initramfs_test_suite = {
 	.name = "initramfs",
+	.suite_init = initramfs_test_init,
 	.test_cases = initramfs_test_cases,
 };
 kunit_test_init_section_suites(&initramfs_test_suite);