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kdbg

FreeBSD kernel debugging scripts

This simple repository holds things I find useful for kernel debugging on FreeBSD.

gdb/

The gdb/ subdirectory holds a set of scripts useful with the kgdb front-end to gdb. To use these scripts, do the following in kgdb:

% git clone https://github.com/bsdjhb/kdbg.git
% cd kdbg/gdb
% kgdb
....
(kgdb) source gdb6
Filename Description
build Wrapper script to configure and build gdb from git using the same setup as the devel/gdb port.
chelsio Commands for use with the cxgb(4) and cxgbe(4) drivers (Chelsio T3/T4/T5 NICs). Requires gdb6.
dot.gdbinit.kernel Older scripts from the main source tree. My plan is to eventually move useful scripts out of here to gdb6 and remove this.
dot.gdbinit.paths See above.
gdb4 General commands for use with FreeBSD 4.x
gdb6 General commands for use with FreeBSD 6.x and later
gdb6.amd64 amd64-specific commands for gdb6. Included automatically by gdb6 on amd64 kernels.
gdb6.i386 i386-specific commands for gdb6. Included automatically by gdb6 on i386 kernels.
gdb6.riscv riscv-specific commands for gdb6.

dtrace/

The dtrace/ subdirectory holds various DTrace scripts.

Filename Description
callout_funcs.d Simple histograms of timer functions
crypto_drivers.d Histogram of which drivers are used to service OpenCrypto requests
crypto_new_session.d Trace crypto drivers probing crypto sessions
eperm.d Determine the source of an EPERM error from stat()
g_media.d Trace source of ZFS SPA_PROBE requests.
ipmi_req.d Trace ioctl requests to /dev/ipmi0
rendezvous.d Generate stats of SMP rendezvous.
schedgraph.d Generate KTR_SCHED-like output for use with schedgraph. Use the make_ktr script to convert the output of this script into what schedgraph expects. I got the original version from rstone@FreeBSD.org.
set_regs_diff.py Output the registers actually changed by each PT_SETREGS ptrace(2) operation
syscalls.d Simple system call histogram.
vfsfilt.d Trace EVFILT_VNODE event activations

bhyve/

The bhyve/ subdirectory holds various variants of vmrun.sh.