Couldn't allocate memory even though memory was available?

andresovela · November 16, 2021, 10:17am

Description

I get a memory allocation failure even though there’s plenty of memory left. See output below:

before update
used:   4256 ( 35 %), frag:   0 %, biggest free:   8032

after update
used:   4256 ( 35 %), frag:   0 %, biggest free:   8032

[Error]	(11.138, +11138)	 lv_mem_realloc: couldn't allocate memory 	(in lv_mem.c line #199)
[Error]	(11.139, +1)	 lv_mem_buf_get: Asserted at expression: buf != NULL (Out of memory, can't allocate a new buffer (increase your LV_MEM_SIZE/heap size)) 	(in lv_mem.c line #298)

As you can see, I have only used 35% of my heap when the allocation fails. I tracked the issue down and it’s trying to reallocate a buffer of 2048 bytes. According to LVGL’s memory monitor, my biggest free chunk is of 8032 bytes, so I don’t understand why is it failing.

The before/after update logs were printed with the following code:

    lv_mem_monitor_t mon;
    lv_mem_monitor(&mon);
    log_trace("before create");
    log_trace("used: %6d (%3d %%), frag: %3d %%, biggest free: %6d",
              (int)(mon.total_size - mon.free_size), mon.used_pct, mon.frag_pct,
              (int)mon.free_biggest_size);

What MCU/Processor/Board and compiler are you using?

NXP MIMXRT1010 with arm gcc 10.3.1

What LVGL version are you using

Latest master (85cc84ad947786bb3d4857290503047946a55c43)

What do you want to achieve?

Fix the allocation without increasing the heap size.

What have you tried so far?

Increasing the heap size from 12kB to 16kB helped for some reason.

andresovela · November 16, 2021, 10:42am

Ok new update: I enabled trace level logs and I see that indeed LVGL tries to reallocate about 8 kB of memory for some reason.

Why does it need so much RAM? I’m only changing the text of a label. It happens pretty consistently when changing the label from “82” to “83”. Why there is beyond me.

[Trace]	(15.660, +2)	 lv_mem_monitor: begin 	(in lv_mem.c line #239)
[Trace]	(15.660, +0)	 lv_mem_monitor: finished 	(in lv_mem.c line #253)

before update
used:   4256 ( 35 %), frag:   0 %, biggest free:   8032

[Trace]	(15.660, +0)	 lv_mem_free: freeing 0x20208a54 	(in lv_mem.c line #161)
[Trace]	(15.660, +0)	 lv_mem_alloc: allocating 3 bytes 	(in lv_mem.c line #125)
[Trace]	(15.660, +0)	 lv_mem_alloc: allocated at 0x20208a54 	(in lv_mem.c line #151)
[Trace]	(15.660, +0)	 lv_mem_monitor: begin 	(in lv_mem.c line #239)
[Trace]	(15.661, +1)	 lv_mem_monitor: finished 	(in lv_mem.c line #253)

after update
used:   4256 ( 35 %), frag:   0 %, biggest free:   8032

[Trace]	(15.670, +9)	 lv_timer_handler: begin 	(in lv_timer.c line #69)
[Trace]	(15.670, +0)	 lv_timer_exec: calling timer callback: 0x6001687d 	(in lv_timer.c line #312)
[Trace]	(15.670, +0)	 _lv_disp_refr_timer: begin 	(in lv_refr.c line #184)
[Info]	(15.670, +0)	 lv_obj_update_layout: Layout update begin 	(in lv_obj_pos.c line #311)
[Trace]	(15.670, +0)	 event_send_core: Sending event 44 to 0x202089d4 with 0x202018a4 param 	(in lv_event.c line #405)
[Trace]	(15.671, +1)	 event_send_core: Sending event 44 to 0x202089d4 with 0x202018ac param 	(in lv_event.c line #405)
[Trace]	(15.671, +0)	 lv_obj_update_layout: Layout update end 	(in lv_obj_pos.c line #314)
[Trace]	(15.671, +0)	 event_send_core: Sending event 18 to 0x20208878 with 0x202018a8 param 	(in lv_event.c line #405)
[Trace]	(15.672, +1)	 event_send_core: Sending event 20 to 0x20208878 with 0x20201878 param 	(in lv_event.c line #405)
[Trace]	(15.672, +0)	 event_send_core: Sending event 21 to 0x20208878 with 0x20201878 param 	(in lv_event.c line #405)
[Trace]	(15.672, +0)	 event_send_core: Sending event 26 to 0x20208878 with 0x202016c8 param 	(in lv_event.c line #405)
[Trace]	(15.674, +2)	 event_send_core: Sending event 27 to 0x20208878 with 0x202016c8 param 	(in lv_event.c line #405)
[Trace]	(15.674, +0)	 event_send_core: Sending event 22 to 0x20208878 with 0x20201878 param 	(in lv_event.c line #405)
[Trace]	(15.674, +0)	 event_send_core: Sending event 20 to 0x202089d4 with 0x20201830 param 	(in lv_event.c line #405)
[Trace]	(15.674, +0)	 event_send_core: Sending event 21 to 0x202089d4 with 0x20201830 param 	(in lv_event.c line #405)
[Trace]	(15.674, +0)	 event_send_core: Sending event 26 to 0x202089d4 with 0x20201620 param 	(in lv_event.c line #405)
[Trace]	(15.674, +0)	 event_send_core: Sending event 27 to 0x202089d4 with 0x20201620 param 	(in lv_event.c line #405)
[Trace]	(15.674, +0)	 lv_mem_buf_get: begin, getting 2001 bytes 	(in lv_mem.c line #266)
[Trace]	(15.674, +0)	 lv_mem_realloc: reallocating 0 with 2001 size 	(in lv_mem.c line #184)
[Trace]	(15.675, +1)	 lv_mem_realloc: allocated at 0x20208b18 	(in lv_mem.c line #203)
[Trace]	(15.675, +0)	 lv_mem_buf_get: allocated (buffer id: 0, address: 0x20208b18) 	(in lv_mem.c line #304)
[Trace]	(15.675, +0)	 lv_mem_buf_get: begin, getting 2001 bytes 	(in lv_mem.c line #266)
[Trace]	(15.675, +0)	 lv_mem_realloc: reallocating 0 with 2001 size 	(in lv_mem.c line #184)
[Trace]	(15.675, +0)	 lv_mem_realloc: allocated at 0x202092f0 	(in lv_mem.c line #203)
[Trace]	(15.675, +0)	 lv_mem_buf_get: allocated (buffer id: 1, address: 0x202092f0) 	(in lv_mem.c line #304)
[Trace]	(15.675, +0)	 lv_mem_buf_release: begin (address: 0x20208b18) 	(in lv_mem.c line #320)
[Trace]	(15.675, +0)	 lv_mem_buf_release: begin (address: 0x202092f0) 	(in lv_mem.c line #320)
[Trace]	(15.675, +0)	 lv_mem_buf_get: begin, getting 2048 bytes 	(in lv_mem.c line #266)
[Trace]	(15.675, +0)	 lv_mem_realloc: reallocating 0x20208b18 with 2048 size 	(in lv_mem.c line #184)
[Trace]	(15.675, +0)	 lv_mem_realloc: allocated at 0x20209ac8 	(in lv_mem.c line #203)
[Trace]	(15.675, +0)	 lv_mem_buf_get: allocated (buffer id: 0, address: 0x20209ac8) 	(in lv_mem.c line #304)
[Trace]	(15.676, +1)	 lv_mem_buf_get: begin, getting 2048 bytes 	(in lv_mem.c line #266)
[Trace]	(15.676, +0)	 lv_mem_realloc: reallocating 0x202092f0 with 2048 size 	(in lv_mem.c line #184)
[Error]	(15.676, +0)	 lv_mem_realloc: couldn't allocate memory 	(in lv_mem.c line #199)
[Error]	(15.676, +0)	 lv_mem_buf_get: Asserted at expression: buf != NULL (Out of memory, can't allocate a new buffer (increase your LV_MEM_SIZE/heap size)) 	(in lv_mem.c line #298)

andresovela · November 16, 2021, 1:20pm

I looked into this a bit further and it looks like LVGL requires a lot of RAM in order to render text with the subpix option enabled. See the code in question here.

LVGL allocates two buffers of size glyph_width * glyph_height . If the font is big enough, this may be a significantly large buffer. There seems to be a cap of _LV_MASK_BUF_MAX_SIZE which is defined by default to 2048 bytes (see here).

That in theory should result into a max of 4 kB per glyph. However, the two buffers are not freed after rendering a letter, they are “released” in what seems to be another layer of abstraction on top of the heap.

For the next letter, LVGL tries to reallocate those two buffers but fails for some reason, must be fragmentation or something. See the following logs.

I’m tempted to open an issue on Github about this, because I think this should work having 8 kB of free RAM. If it’s not supposed to work, then at least there should be a note about this in the documentation.

// ---------------------------------------------------------------------------------------------------
// Label updated here
// ---------------------------------------------------------------------------------------------------

[Trace]	(8.992, +9)	 lv_timer_handler: begin 	(in lv_timer.c line #69)
[Trace]	(8.992, +0)	 lv_timer_handler: finished (1 ms until the next timer call) 	(in lv_timer.c line #144)
[Trace]	(9.002, +10)	 lv_timer_handler: begin 	(in lv_timer.c line #69)
[Trace]	(9.002, +0)	 lv_timer_exec: calling timer callback: 0x6001687d 	(in lv_timer.c line #312)
[Trace]	(9.002, +0)	 _lv_disp_refr_timer: begin 	(in lv_refr.c line #184)
[Info]	(9.002, +0)	 lv_obj_update_layout: Layout update begin 	(in lv_obj_pos.c line #311)
[Trace]	(9.003, +1)	 event_send_core: Sending event 44 to 0x202089d4 with 0x202018a4 param 	(in lv_event.c line #405)
[Trace]	(9.003, +0)	 event_send_core: Sending event 44 to 0x202089d4 with 0x202018ac param 	(in lv_event.c line #405)
[Trace]	(9.003, +0)	 event_send_core: Sending event 41 to 0x202089d4 with 0x202018f8 param 	(in lv_event.c line #405)
[Trace]	(9.004, +1)	 event_send_core: Sending event 34 to 0x20208878 with 0x202089d4 param 	(in lv_event.c line #405)
[Trace]	(9.004, +0)	 event_send_core: Sending event 44 to 0x202089d4 with 0x20201894 param 	(in lv_event.c line #405)
[Trace]	(9.004, +0)	 event_send_core: Sending event 44 to 0x202089d4 with 0x20201894 param 	(in lv_event.c line #405)
[Trace]	(9.004, +0)	 event_send_core: Sending event 44 to 0x20208878 with 0x2020182c param 	(in lv_event.c line #405)
[Trace]	(9.005, +1)	 event_send_core: Sending event 44 to 0x20208878 with 0x2020182c param 	(in lv_event.c line #405)
[Trace]	(9.005, +0)	 lv_obj_update_layout: Layout update end 	(in lv_obj_pos.c line #314)
[Info]	(9.005, +0)	 lv_obj_update_layout: Layout update begin 	(in lv_obj_pos.c line #311)
[Trace]	(9.005, +0)	 event_send_core: Sending event 44 to 0x202089d4 with 0x202018a4 param 	(in lv_event.c line #405)
[Trace]	(9.005, +0)	 event_send_core: Sending event 44 to 0x202089d4 with 0x202018ac param 	(in lv_event.c line #405)
[Trace]	(9.005, +0)	 lv_obj_update_layout: Layout update end 	(in lv_obj_pos.c line #314)
[Trace]	(9.006, +1)	 event_send_core: Sending event 18 to 0x20208878 with 0x202018a8 param 	(in lv_event.c line #405)
[Trace]	(9.006, +0)	 event_send_core: Sending event 20 to 0x20208878 with 0x20201878 param 	(in lv_event.c line #405)
[Trace]	(9.006, +0)	 event_send_core: Sending event 21 to 0x20208878 with 0x20201878 param 	(in lv_event.c line #405)
[Trace]	(9.006, +0)	 event_send_core: Sending event 26 to 0x20208878 with 0x202016c8 param 	(in lv_event.c line #405)
[Trace]	(9.008, +2)	 event_send_core: Sending event 27 to 0x20208878 with 0x202016c8 param 	(in lv_event.c line #405)
[Trace]	(9.008, +0)	 event_send_core: Sending event 22 to 0x20208878 with 0x20201878 param 	(in lv_event.c line #405)
[Trace]	(9.008, +0)	 event_send_core: Sending event 20 to 0x202089d4 with 0x20201830 param 	(in lv_event.c line #405)
[Trace]	(9.008, +0)	 event_send_core: Sending event 21 to 0x202089d4 with 0x20201830 param 	(in lv_event.c line #405)
[Trace]	(9.008, +0)	 event_send_core: Sending event 26 to 0x202089d4 with 0x20201620 param 	(in lv_event.c line #405)
[Trace]	(9.008, +0)	 event_send_core: Sending event 27 to 0x202089d4 with 0x20201620 param 	(in lv_event.c line #405)
[Warn]	(9.008, +0)	 lv_draw_label: lv_draw_label: start
 	(in lv_draw_label.c line #250)
[Trace]	(9.009, +1)	 lv_mem_monitor: begin 	(in lv_mem.c line #239)
[Trace]	(9.009, +0)	 lv_mem_monitor: finished 	(in lv_mem.c line #253)
[Warn]	(9.009, +0)	 draw_letter_subpx: lv_draw_letter: start 	(in lv_draw_label.c line #644)
[Warn]	(9.009, +0)	 draw_letter_subpx: used:   4256 ( 35 %), frag:   0 %, biggest free:   8032 	(in lv_draw_label.c line #645)
[Trace]	(9.009, +0)	 lv_mem_buf_get: begin, getting 2001 bytes 	(in lv_mem.c line #266)
[Trace]	(9.009, +0)	 lv_mem_realloc: reallocating 0 with 2001 size 	(in lv_mem.c line #184)
[Trace]	(9.009, +0)	 lv_mem_realloc: allocated at 0x20208b18 	(in lv_mem.c line #203)
[Trace]	(9.009, +0)	 lv_mem_buf_get: allocated (buffer id: 0, address: 0x20208b18) 	(in lv_mem.c line #304)
[Trace]	(9.009, +0)	 lv_mem_buf_get: begin, getting 2001 bytes 	(in lv_mem.c line #266)
[Trace]	(9.009, +0)	 lv_mem_realloc: reallocating 0 with 2001 size 	(in lv_mem.c line #184)
[Trace]	(9.009, +0)	 lv_mem_realloc: allocated at 0x202092f0 	(in lv_mem.c line #203)
[Trace]	(9.009, +0)	 lv_mem_buf_get: allocated (buffer id: 1, address: 0x202092f0) 	(in lv_mem.c line #304)
[Trace]	(9.010, +1)	 lv_mem_buf_release: begin (address: 0x20208b18) 	(in lv_mem.c line #320)
[Trace]	(9.010, +0)	 lv_mem_buf_release: begin (address: 0x202092f0) 	(in lv_mem.c line #320)
[Trace]	(9.010, +0)	 lv_mem_monitor: begin 	(in lv_mem.c line #239)
[Trace]	(9.010, +0)	 lv_mem_monitor: finished 	(in lv_mem.c line #253)
[Warn]	(9.010, +0)	 draw_letter_subpx: lv_draw_letter: finish 	(in lv_draw_label.c line #845)
[Warn]	(9.010, +0)	 draw_letter_subpx: used:   8272 ( 68 %), frag:   0 %, biggest free:   4016 	(in lv_draw_label.c line #846)
[Trace]	(9.010, +0)	 lv_mem_monitor: begin 	(in lv_mem.c line #239)
[Trace]	(9.010, +0)	 lv_mem_monitor: finished 	(in lv_mem.c line #253)
[Warn]	(9.010, +0)	 draw_letter_subpx: lv_draw_letter: start 	(in lv_draw_label.c line #644)
[Warn]	(9.010, +0)	 draw_letter_subpx: used:   8272 ( 68 %), frag:   0 %, biggest free:   4016 	(in lv_draw_label.c line #645)
[Trace]	(9.010, +0)	 lv_mem_buf_get: begin, getting 1914 bytes 	(in lv_mem.c line #266)
[Trace]	(9.010, +0)	 lv_mem_buf_get: returning already allocated buffer (buffer id: 0, address: 0x20208b18) 	(in lv_mem.c line #288)
[Trace]	(9.010, +0)	 lv_mem_buf_get: begin, getting 1914 bytes 	(in lv_mem.c line #266)
[Trace]	(9.010, +0)	 lv_mem_buf_get: returning already allocated buffer (buffer id: 1, address: 0x202092f0) 	(in lv_mem.c line #288)
[Trace]	(9.011, +1)	 lv_mem_buf_release: begin (address: 0x20208b18) 	(in lv_mem.c line #320)
[Trace]	(9.011, +0)	 lv_mem_buf_release: begin (address: 0x202092f0) 	(in lv_mem.c line #320)
[Trace]	(9.011, +0)	 lv_mem_monitor: begin 	(in lv_mem.c line #239)
[Trace]	(9.018, +0)	 lv_mem_buf_release: begin (address: 0x20209b04) 	(in lv_mem.c line #320)
[Trace]	(9.018, +0)	 lv_mem_buf_get: begin, getting 128 bytes 	(in lv_mem.c line #266)
[Trace]	(9.019, +1)	 lv_mem_buf_get: returning already allocated buffer (buffer id: 2, address: 0x20209b04) 	(in lv_mem.c line #288)
[Trace]	(9.019, +0)	 lv_mem_buf_release: begin (address: 0x20209b04) 	(in lv_mem.c line #320)
[Trace]	(9.019, +0)	 lv_mem_buf_get: begin, getting 256 bytes 	(in lv_mem.c line #266)
[Trace]	(9.019, +0)	 lv_mem_buf_get: begin, getting 256 bytes 	(in lv_mem.c line #266)
[Trace]	(9.019, +0)	 lv_mem_buf_get: returning already allocated buffer (buffer id: 1, address: 0x202092f0) 	(in lv_mem.c line #288)
[Trace]	(9.019, +0)	 lv_mem_buf_release: begin (address: 0x202092f0) 	(in lv_mem.c line #320)
[Trace]	(9.019, +0)	 lv_mem_buf_release: begin (address: 0x20209b04) 	(in lv_mem.c line #320)
[Trace]	(9.019, +0)	 lv_mem_buf_get: begin, getting 128 bytes 	(in lv_mem.c line #266)
[Trace]	(9.019, +0)	 lv_mem_buf_get: returning already allocated buffer (buffer id: 2, address: 0x20209b04) 	(in lv_mem.c line #288)
[Trace]	(9.019, +0)	 lv_mem_buf_release: begin (address: 0x20209b04) 	(in lv_mem.c line #320)
[Trace]	(9.019, +0)	 lv_mem_buf_get: begin, getting 256 bytes 	(in lv_mem.c line #266)
[Trace]	(9.019, +0)	 lv_mem_buf_get: begin, getting 256 bytes 	(in lv_mem.c line #266)
[Trace]	(9.019, +0)	 lv_mem_buf_get: returning already allocated buffer (buffer id: 1, address: 0x202092f0) 	(in lv_mem.c line #288)
[Trace]	(9.019, +0)	 lv_mem_buf_release: begin (address: 0x202092f0) 	(in lv_mem.c line #320)
[Trace]	(9.019, +0)	 lv_mem_buf_release: begin (address: 0x20209b04) 	(in lv_mem.c line #320)
[Trace]	(9.019, +0)	 lv_mem_buf_get: begin, getting 128 bytes 	(in lv_mem.c line #266)
[Trace]	(9.019, +0)	 lv_mem_buf_get: returning already allocated buffer (buffer id: 2, address: 0x20209b04) 	(in lv_mem.c line #288)
[Trace]	(9.019, +0)	 lv_mem_buf_release: begin (address: 0x20209b04) 	(in lv_mem.c line #320)
[Trace]	(9.019, +0)	 lv_mem_buf_get: begin, getting 256 bytes 	(in lv_mem.c line #266)
[Trace]	(9.019, +0)	 lv_mem_buf_get: begin, getting 256 bytes 	(in lv_mem.c line #266)
[Trace]	(9.019, +0)	 lv_mem_buf_get: returning already allocated buffer (buffer id: 1, address: 0x202092f0) 	(in lv_mem.c line #288)
[Trace]	(9.019, +0)	 lv_mem_buf_release: begin (address: 0x202092f0) 	(in lv_mem.c line #320)

// ---------------------------------------------------------------------------------------------------
// Label updated here
// ---------------------------------------------------------------------------------------------------

[Trace]	(9.054, +9)	 lv_timer_handler: begin 	(in lv_timer.c line #69)
[Trace]	(9.054, +0)	 lv_timer_exec: calling timer callback: 0x6001687d 	(in lv_timer.c line #312)
[Trace]	(9.054, +0)	 _lv_disp_refr_timer: begin 	(in lv_refr.c line #184)
[Info]	(9.055, +1)	 lv_obj_update_layout: Layout update begin 	(in lv_obj_pos.c line #311)
[Trace]	(9.055, +0)	 event_send_core: Sending event 44 to 0x202089d4 with 0x202018a4 param 	(in lv_event.c line #405)
[Trace]	(9.055, +0)	 event_send_core: Sending event 44 to 0x202089d4 with 0x202018ac param 	(in lv_event.c line #405)
[Trace]	(9.055, +0)	 lv_obj_update_layout: Layout update end 	(in lv_obj_pos.c line #314)
[Trace]	(9.055, +0)	 event_send_core: Sending event 18 to 0x20208878 with 0x202018a8 param 	(in lv_event.c line #405)
[Trace]	(9.056, +1)	 event_send_core: Sending event 20 to 0x20208878 with 0x20201878 param 	(in lv_event.c line #405)
[Trace]	(9.056, +0)	 event_send_core: Sending event 21 to 0x20208878 with 0x20201878 param 	(in lv_event.c line #405)
[Trace]	(9.056, +0)	 event_send_core: Sending event 26 to 0x20208878 with 0x202016c8 param 	(in lv_event.c line #405)
[Trace]	(9.058, +2)	 event_send_core: Sending event 27 to 0x20208878 with 0x202016c8 param 	(in lv_event.c line #405)
[Trace]	(9.058, +0)	 event_send_core: Sending event 22 to 0x20208878 with 0x20201878 param 	(in lv_event.c line #405)
[Trace]	(9.058, +0)	 event_send_core: Sending event 20 to 0x202089d4 with 0x20201830 param 	(in lv_event.c line #405)
[Trace]	(9.058, +0)	 event_send_core: Sending event 21 to 0x202089d4 with 0x20201830 param 	(in lv_event.c line #405)
[Trace]	(9.058, +0)	 event_send_core: Sending event 26 to 0x202089d4 with 0x20201620 param 	(in lv_event.c line #405)
[Trace]	(9.058, +0)	 event_send_core: Sending event 27 to 0x202089d4 with 0x20201620 param 	(in lv_event.c line #405)
[Warn]	(9.058, +0)	 lv_draw_label: lv_draw_label: start
 	(in lv_draw_label.c line #250)
[Trace]	(9.059, +1)	 lv_mem_monitor: begin 	(in lv_mem.c line #239)
[Trace]	(9.059, +0)	 lv_mem_monitor: finished 	(in lv_mem.c line #253)
[Warn]	(9.059, +0)	 draw_letter_subpx: lv_draw_letter: start 	(in lv_draw_label.c line #644)
[Warn]	(9.059, +0)	 draw_letter_subpx: used:   4256 ( 35 %), frag:   0 %, biggest free:   8032 	(in lv_draw_label.c line #645)
[Trace]	(9.059, +0)	 lv_mem_buf_get: begin, getting 2001 bytes 	(in lv_mem.c line #266)
[Trace]	(9.059, +0)	 lv_mem_realloc: reallocating 0 with 2001 size 	(in lv_mem.c line #184)
[Trace]	(9.059, +0)	 lv_mem_realloc: allocated at 0x20208b18 	(in lv_mem.c line #203)
[Trace]	(9.059, +0)	 lv_mem_buf_get: allocated (buffer id: 0, address: 0x20208b18) 	(in lv_mem.c line #304)
[Trace]	(9.059, +0)	 lv_mem_buf_get: begin, getting 2001 bytes 	(in lv_mem.c line #266)
[Trace]	(9.059, +0)	 lv_mem_realloc: reallocating 0 with 2001 size 	(in lv_mem.c line #184)
[Trace]	(9.059, +0)	 lv_mem_realloc: allocated at 0x202092f0 	(in lv_mem.c line #203)
[Trace]	(9.059, +0)	 lv_mem_buf_get: allocated (buffer id: 1, address: 0x202092f0) 	(in lv_mem.c line #304)
[Trace]	(9.060, +1)	 lv_mem_buf_release: begin (address: 0x20208b18) 	(in lv_mem.c line #320)
[Trace]	(9.060, +0)	 lv_mem_buf_release: begin (address: 0x202092f0) 	(in lv_mem.c line #320)
[Trace]	(9.060, +0)	 lv_mem_monitor: begin 	(in lv_mem.c line #239)
[Trace]	(9.060, +0)	 lv_mem_monitor: finished 	(in lv_mem.c line #253)
[Warn]	(9.060, +0)	 draw_letter_subpx: lv_draw_letter: finish 	(in lv_draw_label.c line #845)
[Warn]	(9.060, +0)	 draw_letter_subpx: used:   8272 ( 68 %), frag:   0 %, biggest free:   4016 	(in lv_draw_label.c line #846)
[Trace]	(9.060, +0)	 lv_mem_monitor: begin 	(in lv_mem.c line #239)
[Trace]	(9.060, +0)	 lv_mem_monitor: finished 	(in lv_mem.c line #253)
[Warn]	(9.060, +0)	 draw_letter_subpx: lv_draw_letter: start 	(in lv_draw_label.c line #644)
[Warn]	(9.060, +0)	 draw_letter_subpx: used:   8272 ( 68 %), frag:   0 %, biggest free:   4016 	(in lv_draw_label.c line #645)
[Trace]	(9.060, +0)	 lv_mem_buf_get: begin, getting 2048 bytes 	(in lv_mem.c line #266)
[Trace]	(9.060, +0)	 lv_mem_realloc: reallocating 0x20208b18 with 2048 size 	(in lv_mem.c line #184)
[Trace]	(9.060, +0)	 lv_mem_realloc: allocated at 0x20209ac8 	(in lv_mem.c line #203)
[Trace]	(9.060, +0)	 lv_mem_buf_get: allocated (buffer id: 0, address: 0x20209ac8) 	(in lv_mem.c line #304)
[Trace]	(9.060, +0)	 lv_mem_buf_get: begin, getting 2048 bytes 	(in lv_mem.c line #266)
[Trace]	(9.060, +0)	 lv_mem_realloc: reallocating 0x202092f0 with 2048 size 	(in lv_mem.c line #184)
[Error]	(9.060, +0)	 lv_mem_realloc: couldn't allocate memory 	(in lv_mem.c line #199)
[Error]	(9.060, +0)	 lv_mem_buf_get: Asserted at expression: buf != NULL (Out of memory, can't allocate a new buffer (increase your LV_MEM_SIZE/heap size)) 	(in lv_mem.c line #298)