---
name: "mountsnoop-bpfcc"
section: "8"
platform: "linux"
package: "bpfcc-tools"
version: "0.31.0+ds-7"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/mountsnoop-bpfcc"
---

# mountsnoop-bpfcc(8)

Trace mount() and umount() syscalls. Uses Linux eBPF/bcc.

## NAME

mountsnoop - Trace mount() and umount() syscalls. Uses Linux eBPF/bcc.

## SYNOPSIS

**mountsnoop**

## DESCRIPTION

mountsnoop traces the mount() and umount() syscalls, showing which processes are mounting and unmounting filesystems in what mount namespaces. This can be useful for troubleshooting system and container setup.

This works by tracing the kernel sys\_mount() and sys\_umount() functions using dynamic tracing, and will need updating to match any changes to this function.

This makes use of a Linux 4.8 feature (bpf\_get\_current\_task()).

Since this uses BPF, only the root user can use this tool.

## REQUIREMENTS

CONFIG\_BPF and bcc.

## FIELDS

- COMM

  Process name

- PID

  Process ID

- TID

  Thread ID

- MNT\_NS

  Mount namespace inode number

- CALL

  System call, arguments, and return value

## OVERHEAD

This traces the kernel mount and umount functions and prints output for each event. As the rate of these calls is generally expected to be very low, the overhead is also expected to be negligible. If your system calls mount() and umount() at a high rate, then test and understand overhead before use.

## SOURCE

This is from bcc.

-

  https://github.com/iovisor/bcc

Also look in the bcc distribution for a companion \_examples.txt file containing example usage, output, and commentary for this tool.

## OS

Linux

## STABILITY

Unstable - in development.

## AUTHOR

Omar Sandoval

## SEE ALSO

[mount(2)](/mount/2.md) [umount(2)](/umount/2.md)