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[PATCH 0/1] grub-fs-tester: fix losetup race
From: |
Will Thompson |
Subject: |
[PATCH 0/1] grub-fs-tester: fix losetup race |
Date: |
Fri, 15 Jun 2018 18:34:03 +0100 |
On a build server where other jobs are making use of loop devices, we
occasionally see GRUB's filesystem tests failing with errors like:
losetup: /tmp/tmp.uMgVEh1vvn/ext2_old_256_1024_1_0.img: failed to set
up loop device: Device or resource busy
This is because grub-fs-tester runs `losetup --find` to get a free loop
device, then runs `losetup $LODEVICE $FILE` to use it. In between the
two invocations, something else may have started using the free device.
It's easy to reproduce this by running a script like this at the same
time as a fs test:
while true; do
x=$(losetup --find --show /path/to/a/file)
losetup -d $x
done
The fix is to ask losetup to attach the file to a free loop device, and
print that device to stdout, in a single invocation. (losetup internally
has a retry loop.)
Will Thompson (1):
grub-fs-tester: fix losetup race
tests/util/grub-fs-tester.in | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
--
2.17.1
- [PATCH 0/1] grub-fs-tester: fix losetup race,
Will Thompson <=