On 29/06/2021 19:20, Josef Bacik wrote:

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On 6/29/21 1:00 PM, Krzysztof Kozlowski wrote:

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Dear BTRFS folks,

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I am hitting a potential regression of btrfs, visible only with
fallocate05 test from LTP (Linux Test Project) only on 32+ core Azure
instances (x86_64).

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Tested:
v5.8 (Ubuntu with our stable patches): PASS
v5.11 (Ubuntu with our stable patches): FAIL
v5.13 mainline: FAIL

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PASS means test passes on all instances
FAIL means test passes on other instance types (e.g. 4 or 16 core) but
fails on 32 and 64 core instances (did not test higher),
e.g.: Standard_F32s_v2, Standard_F64s_v2, Standard_D32s_v3,
Standard_E32s_v3

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Reproduction steps:
git clone https://github.com/linux-test-project/ltp.git
cd ltp
./build.sh && make install -j8
cd ../ltp-install
sudo ./runltp -f syscalls -s fallocate05

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This thing keeps trying to test ext2, how do I make it only test btrfs?  Thanks,

It tests all available file systems, just wait till it gets to btrfs. I
don't know how to limit it only to one file system.

In the future we can add environment variable to specify the only fs to be
tested. There is LTP_DEV_FS_TYPE, but that does not work when .all_filesystems
flag is enabled. Thus just patch the file:

Kind regards,
Petr

diff --git testcases/kernel/syscalls/fallocate/fallocate05.c testcases/kernel/syscalls/fallocate/fallocate05.c
index 55ec1aee4..7f5a3005a 100644
--- testcases/kernel/syscalls/fallocate/fallocate05.c
+++ testcases/kernel/syscalls/fallocate/fallocate05.c

@@ -149,7 +149,8 @@ static struct tst_test test = {
 	.mount_device = 1,
 	.dev_min_size = 512,
 	.mntpoint = MNTPOINT,
-	.all_filesystems = 1,
+	.needs_device = 1,
+	.dev_fs_type = "btrfs",
 	.setup = setup,
 	.cleanup = cleanup,
 	.test_all = run,