NAME¶

inject - injects appropriate error into function if input call chain and predicates are satisfied. Uses Linux eBPF/bcc.

SYNOPSIS¶

inject -h [-I header] [-P probability] [-v] [-C count] mode spec

DESCRIPTION¶

inject injects errors into specified kernel functionality when a given call chain and associated predicates are satsified.

WARNING: This tool injects failures into key kernel functions and may crash the kernel. You should know what you're doing if you're using this tool.

This makes use of a Linux 4.16 feature (bpf_override_return())

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

REQUIREMENTS¶

CONFIG_BPF, CONFIG_BPF_KPROBE_OVERRIDE, bcc

OPTIONS¶

-h

Print usage message.

-v

Display the generated BPF program, for debugging or modification.

-I header

Necessary headers to be included.

-P probability

Optional probability of failure, default 1.

-C count

Number of errors to inject before stopping, default never stops.

EXAMPLES¶

Please see inject_example.txt

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¶

Howard McLauchlan