i do not understand which branch to apply this patch
--
Best regards,
Konstantin Khorenko,
Virtuozzo Linux Kernel Team
On 5/18/26 13:35, Eva Kurchatova wrote:
The test assumes fs.nr_open is close to the default 1048576, but some
systems set it much higher (e.g. 1073741816). In that case, dup2() to
nr_open + 64 requires the kernel to allocate a file descriptor table
with ~1 billion entries, which fails with ENOMEM.
Fix by setting fs.nr_open to a known reasonable base value (1048576)
for the duration of the test, rather than using whatever the system
happens to have.
Signed-off-by: Eva Kurchatova <[email protected]>
https://virtuozzo.atlassian.net/browse/VSTOR-131560
Feature: fix kselftests
---
tools/testing/selftests/core/unshare_test.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/tools/testing/selftests/core/unshare_test.c
b/tools/testing/selftests/core/unshare_test.c
index 7fec9dfb1b0e..f4a4aac6afc4 100644
--- a/tools/testing/selftests/core/unshare_test.c
+++ b/tools/testing/selftests/core/unshare_test.c
@@ -40,6 +40,10 @@ TEST(unshare_EMFILE)
ASSERT_EQ(sscanf(buf, "%d", &nr_open), 1);
+ /* Cap nr_open to avoid ENOMEM from a huge fd table allocation */
+ if (nr_open > 1024 * 1024)
+ n = sprintf(buf, "%d\n", (nr_open = 1024 * 1024));
+
ASSERT_EQ(0, getrlimit(RLIMIT_NOFILE, &rlimit));
/* bump fs.nr_open */
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