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west build (intermitently) fails when OTA enabled (CONFIG_ZIGBEE_FOTA) and imgtool.py misbehaving... why?

Have a NCS/ZBoss-based Zigbee app running and I want to enable FOTA, and it was failing with missing app_update.bin file.

Thinking it might be something with my own code, I enabled FOTA for the light_switch sample and built it, that's when things got strange. 

The end of the process is (sometimes??):

[393/409] Linking C executable zephyr/zephyr.elf
Memory region         Used Size  Region Size  %age Used
           FLASH:      308064 B     474624 B     64.91%
            SRAM:       68116 B       440 KB     15.12%
        IDT_LIST:          0 GB         2 KB      0.00%
[403/409] Generating ../../zephyr/net_core_app_test_update.hex
Zigbee update created at 127F-FFFF-01020003-light_switch.zigbee
[406/409] Generating ../../zephyr/app_test_update.hex
Zigbee update created at 127F-FFFF-01020003-light_switch.zigbee
[409/409] Generating zephyr/merged_domains.hex

Looks good.  But when I ran it again:

[Errno 2] No such file or directory: '/path/to/dev/nrf/build/zephyr/app_update.bin'

Odd... So, running west build in a loop (with -p always) and piping output to log files, I find that 11 runs out of 30 produce the update image, and the rest fail.  Same command, pristine builds, different results.  It's almost every second run for a while, but not really.

Successes:

$ grep 'Zigbee update created' lightsw* | sort -n | uniq
lightsw01.txt:Zigbee update created at 127F-FFFF-01020003-light_switch.zigbee
lightsw08.txt:Zigbee update created at 127F-FFFF-01020003-light_switch.zigbee
lightsw12.txt:Zigbee update created at 127F-FFFF-01020003-light_switch.zigbee
lightsw14.txt:Zigbee update created at 127F-FFFF-01020003-light_switch.zigbee
lightsw16.txt:Zigbee update created at 127F-FFFF-01020003-light_switch.zigbee
lightsw18.txt:Zigbee update created at 127F-FFFF-01020003-light_switch.zigbee
lightsw22.txt:Zigbee update created at 127F-FFFF-01020003-light_switch.zigbee
lightsw24.txt:Zigbee update createdat 127F-FFFF-01020003-light_switch.zigbee
lightsw25.txt:Zigbee update created at 127F-FFFF-01020003-light_switch.zigbee
lightsw26.txt:Zigbee update created at 127F-FFFF-01020003-light_switch.zigbee
lightsw27.txt:Zigbee update created at 127F-FFFF-01020003-light_switch.zigbee

Failures:

$ grep 'Errno 2' lightsw* | sort -n 
lightsw02.txt:[Errno 2] No such file or directory: '/storage/pat/dev/nrf/build/zephyr/app_update.bin'
lightsw03.txt:[Errno 2] No such file or directory: '/storage/pat/dev/nrf/build/zephyr/app_update.bin'
lightsw04.txt:[Errno 2] No such file or directory: '/storage/pat/dev/nrf/build/zephyr/app_update.bin'
lightsw05.txt:[Errno 2] No such file or directory: '/storage/pat/dev/nrf/build/zephyr/app_update.bin'
lightsw06.txt:[Errno 2] No such file or directory: '/storage/pat/dev/nrf/build/zephyr/app_update.bin'
lightsw09.txt:[Errno 2] No such file or directory: '/storage/pat/dev/nrf/build/zephyr/app_update.bin'
lightsw10.txt:[Errno 2] No such file or directory: '/storage/pat/dev/nrf/build/zephyr/app_update.bin'
lightsw11.txt:[Errno 2] No such file or directory: '/storage/pat/dev/nrf/build/zephyr/app_update.bin'
lightsw13.txt:[Errno 2] No such file or directory: '/storage/pat/dev/nrf/build/zephyr/app_update.bin'
lightsw15.txt:[Errno 2] No such file or directory: '/storage/pat/dev/nrf/build/zephyr/app_update.bin'
lightsw17.txt:[Errno 2] No such file or directory: '/storage/pat/dev/nrf/build/zephyr/app_update.bin'
lightsw19.txt:[Errno 2] No such file or directory: '/storage/pat/dev/nrf/build/zephyr/app_update.bin'
lightsw20.txt:[Errno 2] No such file or directory: '/storage/pat/dev/nrf/build/zephyr/app_update.bin'
lightsw21.txt:[Errno 2] No such file or directory: '/storage/pat/dev/nrf/build/zephyr/app_update.bin'
lightsw23.txt:[Errno 2] No such file or directory: '/storage/pat/dev/nrf/build/zephyr/app_update.bin'
lightsw28.txt:[Errno 2] No such file or directory: '/storage/pat/dev/nrf/build/zephyr/app_update.bin'
lightsw29.txt:[Errno 2] No such file or directory: '/storage/pat/dev/nrf/build/zephyr/app_update.bin'

and it never succeeds with my own code.

The questions are basically what is causing this, or how can I get the system to at least tell me what's wrong when it's ending with:

[257/263] Generating linker.cmd
[258/263] Generating isr_tables.c, isrList.bin
[259/263] Generating dev_handles.c
[260/263] Building C object zephyr/CMakeFiles/zephyr_final.dir/misc/empty_file.c.obj
[261/263] Building C object zephyr/CMakeFiles/zephyr_final.dir/isr_tables.c.obj
[262/263] Building C object zephyr/CMakeFiles/zephyr_final.dir/dev_handles.c.obj
[263/263] Linking C executable zephyr/zephyr.elf
Memory region         Used Size  Region Size  %age Used
           FLASH:       36276 B        48 KB     73.80%
            SRAM:       22712 B       440 KB      5.04%
        IDT_LIST:          0 GB         2 KB      0.00%
[394/409] Linking C executable zephyr/zephyr.elf
Memory region         Used Size  Region Size  %age Used
           FLASH:      308064 B     474624 B     64.91%
            SRAM:       68116 B       440 KB     15.12%
        IDT_LIST:          0 GB         2 KB      0.00%
[396/409] Generating ../../zephyr/net_core_app_test_update.hex
FAILED: zephyr/net_core_app_test_update.hex /storage/pat/dev/nrf/build/zephyr/net_core_app_test_update.hex
cd /storage/pat/dev/nrf/build/modules/mcuboot && /usr/bin/python3.9 /storage/pat/dev/nrf/bootloader/mcuboot/scripts/imgtool.py sign --key /storage/pat/dev/nrf/bootloader/mcuboot/root-rsa-2048.pem --header-size 0x200 --align 4 --version 1.2.3 --pad-header --slot-size 0x74000 --pad /storage/pat/dev/nrf/build/multiprotocol_rpmsg/zephyr/signed_by_b0_app.hex /storage/pat/dev/nrf/build/zephyr/net_core_app_test_update.hex && /usr/bin/python3.9 /storage/pat/dev/nrf/nrf/scripts/bootloader/zb_add_ota_header.py --application /storage/pat/dev/nrf/build/zephyr/app_update.bin --application-version-string 1.2.3 --zigbee-manufacturer-id 0x127F --zigbee-image-type 0xFFFF --zigbee-comment light_switch --zigbee-ota-min-hw-version --zigbee-ota-max-hw-version --out-directory /storage/pat/dev/nrf/build/zephyr
[Errno 2] No such file or directory: '/storage/pat/dev/nrf/build/zephyr/app_update.bin'
[398/409] Generating zephyr/mcuboot_primary_app.hex
ninja: build stopped: subcommand failed.
FATAL ERROR: command exited with status 1: /home/pat/.local/bin/cmake --build /storage/pat/dev/nrf/build

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