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  1. Bug #1939996
  2. Comment #3

Comment 3 for bug 1939996

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Nicholas Guriev (mymedia) wrote :

I can reproduce the bug on -22 and -25 kernels. Here are almost full dmesg logs. You can see SSD errors where swap is placed. This issue may be related to them somehow. To exclude hardware element of errors, I will try other more recent laptop or VirtualBox.

Steps:

1. sudo mount -t tmpfs -o mode=775 tmpfs /mnt

2. sudo dd if=/dev/urandom of=/mnt/garbage
Wait till ENOSPC. In my case, the garbage file becomes of 8 GB.

3. ./eatmem 5000000
This hand-made program only consumes a lot of memory in a loop then sleeps.

So I speculate when the kernel wants to displace tmpfs content to a swap, it encounters the bug. If I reverse second and third steps, the bug does not appear.