I forget how I acquired this list – it’s about 8 years old, but probably still close [I’ve improved the layout a bit on a re-edit with preformatting]:
debugger commands:
area Dump info about a particular area
areas Dump a list of all areas
aspace Dump info about a particular address space
aspaces Dump a list of all address spaces
avail Dump available memory
bfs dump a BFS volume
bfs_allocator dump a BFS block allocator
bfs_block_runs dump a block run array
bfs_btree_header dump a BFS B+tree header
bfs_btree_node dump a BFS B+tree node
bfs_inode dump an Inode object
bfs_journal dump the journal log entries
block_cache dumps a specific block cache
block_caches dumps all block caches
breakpoint Set/clears a breakpoint
breakpoints Lists current break-/watchpoints
bt Same as "sc" (as in gdb)
cache Dump vm_cache
cache_info dump information about a specific cache
cache_tree Dump vm_cache tree
caches List all vm_cache trees
call Show call with arguments
calling Show all threads that have a specific address in their call chain
cbuf_freelist Dumps the cbuf free lists
continue Leave kernel debugger
cpu Switches to another CPU.
cvar Dump condition variable info
cvars List condition variables
daemons Shows registered kernel daemons.
db dump memory bytes (8-bit)
devfs_node info about a private devfs node
dis Print disassembly at address
dl dump memory long words (64-bit)
dm_tree dump device node tree
dma_buffer dump a DMA buffer
drop Drop a thread into the userland debugger
ds dump memory shorts (16-bit)
dw dump memory words (32-bit)
error Prints a human-readable description for an error code
es Same as "continue"
exit Same as "continue"
expr Evaluates the given expression and prints the result
faults Toggles fault handling for debugger commands
file_map Dumps the specified file map.
file_map_stats Dumps some file map statistics.
find_page Find out which queue a page is actually in
gdb Connect to remote gdb
get_usb_pipe_for_id Gets the config for a USB pipe
grep Filters output from another command
head Prints only the first lines of output from another command
heap Dump infos about the kernel heap(s)
help List all debugger commands
ici Dump info on pending ICI messages
ici_message Dump info on an ICI message
iframe Dump iframes for the specified thread
image dump image info
in16 dump io shorts (16-bit)
in32 dump io words (32-bit)
in8 dump io bytes (8-bit)
in_context Executes a command in the context of a given thread
inb dump io bytes (8-bit)
info System info
ins dump io shorts (16-bit)
ints list interrupt statistics
inw dump io words (32-bit)
io_buffer dump an I/O buffer
io_context info about the I/O context
io_operation dump an I/O operation
io_request dump an I/O request
io_request_owner Dump an I/O request owner
io_scheduler Dump an I/O scheduler
ipv4_multicast list all current IPv4 multicast states
kdlhangman A funny KDL hangman game :-)
legacy_driver info about a legacy driver entry
low_resource Dump list of low resource handlers
ls lookup symbol for a particular address
message Reprint the message printed when entering KDL
modules list all known & loaded modules
mount info about the specified fs_mount
mounts list all fs_mounts
mutex Dump info about a mutex
net_timer Lists all active network timer
on_exit Adds a command to be run when leaving the kernel debugger
oss_dump_cards Dump the OSS cards[] array.
oss_dump_cdevs Dump the OSS cdevs[] array.
out16 write io shorts (16-bit)
out32 write io words (32-bit)
out8 write io bytes (8-bit)
outb write io bytes (8-bit)
outs write io shorts (16-bit)
outw write io words (32-bit)
page Dump page info
page_queue Dump page queue
page_stats Dump statistics about page usage
paging Enable or disable paging
pcistatus dump and clear pci device status registers
port Dump info about a particular port
ports Dump a list of all active ports (for team, with name, etc.)
priority Set a thread's priority
ps2republish republish a ps2 device (0-3 mouse, 4 keyb (default))
ready List all ready threads
realtime List all realtime threads
reboot Reboot the system
resume Resume a thread
rtc Set and test the real-time clock
run_queue List threads in run queue
running List all running threads
rwlock Dump info about an rw lock
sc Stack crawl for current thread (or any other)
sem Dump info about a particular semaphore
sems Dump a list of all active semaphores (for team, with name, etc.)
show_waste show cache allocator's memory waste
shutdown Shut down the system
slabs list all object caches
socket dumps a socket
sockets lists all sockets
spinlock Dump info on a spinlock
step Single-steps to the next instruction
string dump strings
suspend Suspend a thread
swap Print infos about the swap usage
symbol search symbol in images
symbols dump symbols for image
syslog Dumps the syslog buffer.
tail Prints only the last lines of output from another command
tcp_endpoint dumps a TCP endpoint internal state
tcp_endpoints lists all open TCP endpoints
team Dump info about a particular team
team_images Dump all registered images from the current team
teams List all teams
thread Dump info about a particular thread
threads List all threads
transaction dumps a specific transaction
tty Dump info on a tty
udp_endpoints lists all open UDP endpoints
uhci_process_transfer Processes a USB transfer with the given variables
unreal Set realtime priority threads to normal priority
unset Unsets the given variable
unset_all Unsets all variables
vars Lists all defined variables with their values
vnode info about the specified vnode
vnode_caches list all vnode caches
vnode_usage info about vnode usage
vnodes list all vnodes (from the specified device)
waiting List all waiting threads (optionally for a specific semaphore)
watchpoint Set/clears a watchpoint
watchpoints Lists current break-/watchpoints
wc Counts the lines, words, and characters of another command's output
where Same as "sc"