pwndbg/docs/commands/kernel/kmem-trace.md

kmem-trace

usage: kmem-trace [-h] [-s] [-b] [-v] [-c COMMAND] [--all]

Trace kernel memory (SLUB and buddy) allocations and frees.

This command will execute next in the debugger, and print out all (de)allocations that happen until the command finishes. As such this makes most sense to call when the PC is on a function call instruction. Only (de)allocations triggered by the current function are considered (rather than other threads etc).

If neither -s nor -b are passed, both allocators are traced.

Optional arguments

Short	Long	Help
-h	--help	show this help message and exit
-s	--trace-slab	do only slab allocator tracing
-b	--trace-buddy	do only buddy allocator tracing
-v	--verbose	print backtraces
-c	--command	trace during the execution of this command (default: 'next')
	--all	display ALL memory allocations/frees regardless if they are triggered by the current function.

Notes

The --all flag may be helpful if you also want to trace frees scheduled with rcu or if the traced command steps out of the current function. You may also find -c finish and -c continue useful.