** Changed in: linux
Status: Confirmed => Unknown
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https://bugs.launchpad.net/bugs/2041670
Title:
tmpfs: O_DIRECT | O_CREATE open reports open failure but actually
creates a file.
Status in Linux:
Unknown
Status in linux package in Ubuntu:
New
Bug description:
creating a file on tmpfs with open(filename, O_RDWR | O_DIRECT |
O_CREAT, 0666) reports an open failure error EINVAL, but still creates
the file. The file should not be created if we hit such an error.
Tested and fails on:
mantic amd64: 6.5.0-10-generic
lunar amd64: 6.2.0-35-generic
jammie amd64: 5.15.0-generic
focal: 5.4.0-165-generic
bionic: 4.15.0-213-generic
trusty: 4.4.0-148-generic
sudo mkdir /mnt/tmpfs
sudo mount -t tmpfs -o size=1G,nr_inodes=10k,mode=777 tmpfs /mnt/tmpfs
sudo chmod 666 /mnt/tmpfs
gcc reproducer.c -o reproducer
sudo ./reproducer
Run the attached program. It reports an open failure (errno 22,
EINVAL) but still manages to create the file.
Note this was original discovered by running stress-ng on tmpfs with
the open stressor: stress-ng --open 1
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