Something goes wrong with memory and CASE sessions

[bzbarsky-apple]

Problem

Steps to reproduce:

1. Pull ToT (rev 34bccf5d90edd8c1c465f59c565cd13a0b058d62 for me right now).
2. Build all-clusters-app for m5stack:

   % cd examples/all-clusters-app/esp32
   % source idf.sh
   % idf make erase_flash flash monitor -j16 ESPPORT=/dev/tty.SLAB_USBtoUART
   

3. In another terminal:

   % ./gn_build.sh
   % ./out/debug/standalone/chip-tool pairing ble-wifi SSID PASSWD 0 12345678 3840
   % ./out/debug/standalone/chip-tool onoff toggle 1
   % ./out/debug/standalone/chip-tool onoff toggle 1
   % ./out/debug/standalone/chip-tool onoff toggle 1
   % ./out/debug/standalone/chip-tool onoff toggle 1
   

I see a bunch of asserts/crashes/backtraces on the m5stack. See attached log, search for "backtrace". They generally seem to be happening during heap operations from crypto code.

Proposed Solution

Figure out what's going on (are we running out of heap?) and fix it.

@pan-apple

log.txt

[pan-apple]

It seems we are running out of heap on ESP32 platform. Likely a memory leak somewhere.

    /* Note: this check must be done while holding the lock as both
       malloc & realloc may temporarily shrink the free_bytes value
       before they split a large block. This can result in false negatives,
       especially if the heap is unfragmented.
    */
    if (heap->free_bytes < size) {
        MULTI_HEAP_UNLOCK(heap->lock);
        return NULL;
    }

[bzbarsky-apple]

I just realized all-clusters-app actually logs its free heap amounts. Just those lines from the log:

(1002) app-devicecallbacks: Current free heap: 108376
(1022) app-devicecallbacks: Current free heap: 108376

A bunch of output to be expanded

(1102) app-devicecallbacks: Current free heap: 108376
(1132) app-devicecallbacks: Current free heap: 108376
(1392) app-devicecallbacks: Current free heap: 105548
(1422) app-devicecallbacks: Current free heap: 89628
(1442) app-devicecallbacks: Current free heap: 89632
(1462) app-devicecallbacks: Current free heap: 89624
(1492) app-devicecallbacks: Current free heap: 88988
(1592) app-devicecallbacks: Current free heap: 85760
(1612) app-devicecallbacks: Current free heap: 85760
(1652) app-devicecallbacks: Current free heap: 84660
(1682) app-devicecallbacks: Current free heap: 84660
(1702) app-devicecallbacks: Current free heap: 84660
(1722) app-devicecallbacks: Current free heap: 84660
(1752) app-devicecallbacks: Current free heap: 84660
(1772) app-devicecallbacks: Current free heap: 84660
(1802) app-devicecallbacks: Current free heap: 84660
(1832) app-devicecallbacks: Current free heap: 84656
(1862) app-devicecallbacks: Current free heap: 84656
(1892) app-devicecallbacks: Current free heap: 84656
(1912) app-devicecallbacks: Current free heap: 84656
(1982) app-devicecallbacks: Current free heap: 83400
(2012) app-devicecallbacks: Current free heap: 83268
(5552) app-devicecallbacks: Current free heap: 77864
(9622) app-devicecallbacks: Current free heap: 76384
(12902) app-devicecallbacks: Current free heap: 65120
(13072) app-devicecallbacks: Current free heap: 68048
(13092) app-devicecallbacks: Current free heap: 68048
(16992) app-devicecallbacks: Current free heap: 70500
(17012) app-devicecallbacks: Current free heap: 70500
(18852) app-devicecallbacks: Current free heap: 70272
(18932) app-devicecallbacks: Current free heap: 68448
(18952) app-devicecallbacks: Current free heap: 69812
(19022) app-devicecallbacks: Current free heap: 69508
(19092) app-devicecallbacks: Current free heap: 69724
(28602) app-devicecallbacks: Current free heap: 60768
(28622) app-devicecallbacks: Current free heap: 60768
(28652) app-devicecallbacks: Current free heap: 60768
(36952) app-devicecallbacks: Current free heap: 62588
(36972) app-devicecallbacks: Current free heap: 62588
(42622) app-devicecallbacks: Current free heap: 56880
(42642) app-devicecallbacks: Current free heap: 56880
(42672) app-devicecallbacks: Current free heap: 56880
(45312) app-devicecallbacks: Current free heap: 57752
(45342) app-devicecallbacks: Current free heap: 57752
(50832) app-devicecallbacks: Current free heap: 52048
(50852) app-devicecallbacks: Current free heap: 52048
(50872) app-devicecallbacks: Current free heap: 52040
(54992) app-devicecallbacks: Current free heap: 52904
(55022) app-devicecallbacks: Current free heap: 52912
(59622) app-devicecallbacks: Current free heap: 47204
(59652) app-devicecallbacks: Current free heap: 47204
(59672) app-devicecallbacks: Current free heap: 47204
(62792) app-devicecallbacks: Current free heap: 48080
(62812) app-devicecallbacks: Current free heap: 48080
(71522) app-devicecallbacks: Current free heap: 42400
(71542) app-devicecallbacks: Current free heap: 42400
(71572) app-devicecallbacks: Current free heap: 42400
(80582) app-devicecallbacks: Current free heap: 43280
(80602) app-devicecallbacks: Current free heap: 43280
(92112) app-devicecallbacks: Current free heap: 37568
(92142) app-devicecallbacks: Current free heap: 37568
(92162) app-devicecallbacks: Current free heap: 37568

(103412) app-devicecallbacks: Current free heap: 38448
(103442) app-devicecallbacks: Current free heap: 36748
(116622) app-devicecallbacks: Current free heap: 32732
(116642) app-devicecallbacks: Current free heap: 32732
(116672) app-devicecallbacks: Current free heap: 32732

[woody-apple]

Looks resolved?

[bzbarsky-apple]

Yes, haven't hit this in a while.