Also seen in a potentially (happened three times) reproductible way on a
2.6.34 (with grsecurity patches, but this is unrelated probably) ; sshfs
2.1-1
Way to reproduce, apparently:
(1) create a local storage file on a machine #1 with something like 20GB
of space (dd if=/dev/urandom of=/backup/space bs=1k count=20000000)
(2) remotely mount the directory where the file lies using sshfs on a
machine #2 (not on the same LAN, but with something like 20ms of lag) ;
the only specific option used is '-C' (compression)
(3) losetup -e aes /dev/loop0 /mnt/remote-mount
(4) mkfs -t ext2 /dev/loop0
[ie. mkfs through the sshfs tunnel]
The mkfs would hang randomly ; sometimes when creating the structures,
sometimes when finishing.
The mkfs in that state is unkillable and takes all cpu it can, and
processes attempting to touch the mount point directory would hang.
Attempting to strace it also hangs the strace (which becomes unkillable)
Killing ssh on the other side does not appear to solve the issue in my
case, but not try to kill the ssh on the other side.
Feel free to ask me any specific test/debugging.
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