Update the malloc() with more info about the debugging features:
- CONFIG_MALLOC_DEBUG and CONFIG_MCHECK_HEAP_PROTECTION Kconfig options
- The malloc command with info and dump subcommands
- Caller backtrace display when mcheck is enabled
Series-to: concept
Series-cc: heinrich
Series-version: 2
Cover-letter:
malloc: Add heap debugging commands and mcheck caller tracking
This series adds improved heap-debugging capabilities.
As part of this, the recently added backtrace feature is reworked to
avoid itself using malloc(), which makes it difficult for malloc() to
use.
A new 'malloc' command with 'info' and 'dump' subcommands allows
inspecting the heap state at runtime.
The mcheck heap-protection feature is integrated into Kconfig and can be
used to to track caller information for each allocation, showing the
function name and line number.
The caller info can be seen with 'malloc dump', including for freed
chunks where possible.
The 'malloc info' command shows a few more heap statistics:
=> malloc info
total bytes = 96 MiB
in use bytes = 700.9 KiB
malloc count = 1234
free count = 567
realloc count = 89
The 'malloc dump' command walks the heap showing each chunk:
=> malloc dump
Heap dump: 19a0e000 - 1fa10000
Address Size Status
----------------------------------
19a0e000 10 (chunk header)
19a0e010 a0 log_init:453 <-board_init_r:774 <-sandbox_flow:
19a0e0b0 20070 membuf_new:420 <-console_record_init:880 <-boar
19a2e120 170 membuf_new:420 <-console_record_init:886 <-boar
19a2e290 150 unflatten_device_tree:299 <-of_live_build:328 <
19a2e3e0 a0 uclass_get:157 <-device_bind_common:59 <-device
...
19a4b080 70 free done_word:2489 <-parse_stream_outer:3190 <-pars
...
This is useful for debugging memory leaks, understanding allocation
patterns, and tracking down heap corruption issues.
Some additional patches are included to make all this work:
- format_size() for human-readable size formatting
- ut_asserteq_regex() for flexible test assertions
- backtrace_str() for condensed backtrace output
Finally, this series includes a few patches for some of the more obvious
memory leaks (scmi and some test drivers), plus a reduction in truetype
memory allocations and a fix for a watchdog crash with 'ut dm'.
END
Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
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