Snapshots was allowed to mount as read-write and attempt to write to that snapshot lead a kernel panic #6510
Description
System information
| Type | Version/Name |
|---|---|
| Distribution Name | Debian GNU/Linux |
| Distribution Version | 9 |
| Linux Kernel | 4.9 |
| Architecture | amd64 |
| ZFS Version | 0.7.1 |
| SPL Version | 0.7.1 |
The console screenshot are [removed link]
Describe the problem you're observing
I was suppressed at first when I discovered I could just mount -o remount,rw a snapshot file system under the .zfs/snapshot/ directory. When I trying to create a file in a rw mounted snapshot, expecting some errors, but the kernel then panics, the panic message is "dirtying snapshot!".
Describe how to reproduce the problem
Create a snapshot;
Browse the snapshot from .zfs/snapshot/ or mount the snapshot directly;
Run a mount -o remount,rw <path> to remount the snapshot file system read-write;
Modify the read-write mounted file system, such as creating new file or truncating exist file.
Include any warning/errors/backtraces from the system logs
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