IDE re-attaches to non-existent COM port after upload on SAMD board

[cuyahoga]

After compiling and uploading any sketch - Blink will do as an example - the selected port jumps from the correct one (say COM13) to the next numerical - but non-existent - port, (such as COM14). The sketch gets uploaded, but one then has to wait for the board to finish re-initialising after the upload, before re-selecting the correct port in the IDE. Same thing happens if the board's on COM17 ... it jumps to COM18.

OS : Win 7 64-bit
IDE : 1.6.7 and nightly (2016/02/02)
SAMD Boards 1.6.2:

Verbose output on upload revealed;

Sketch uses 10,988 bytes (4%) of program storage space. Maximum is 262,144 bytes.
Forcing reset using 1200bps open/close on port COM13
PORTS {COM3, COM13, } / {COM3, COM13, } => {}
PORTS {COM3, COM13, } / {COM3, } => {}
PORTS {COM3, } / {COM3, } => {}
PORTS {COM3, } / {COM3, COM14, } => {COM14, }
Found upload port: COM14
C:\Users\xxxxx\AppData\Local\Arduino15\packages\arduino\tools\bossac\1.6.1-arduino/bossac.exe -i -d --port=COM14 -U true -i -e -w -v C:\Users\xxxxx~1\AppData\Local\Temp\build81716e661910f192b156ff7c623177af.tmp/Blink.ino.bin -R
Set binary mode
readWord(addr=0)=0x200023a8
readWord(addr=0xe000ed00)=0x410cc601
readWord(addr=0x41002018)=0x10010305
version()=v1.1 [Arduino:XYZ] Oct 31 2015 00:47:48
chipId=0x10010005
Connected at 921600 baud
readWord(addr=0)=0x200023a8
readWord(addr=0xe000ed00)=0x410cc601
readWord(addr=0x41002018)=0x10010305
Atmel SMART device 0x10010005 found
write(addr=0x20004000,size=0x34)
writeWord(addr=0x20004030,value=0x10)
writeWord(addr=0x20004020,value=0x20008000)
Device : ATSAMD21G18A
readWord(addr=0)=0x200023a8
readWord(addr=0xe000ed00)=0x410cc601
readWord(addr=0x41002018)=0x10010305
Chip ID : 10010005
version()=v1.1 [Arduino:XYZ] Oct 31 2015 00:47:48
Version : v1.1 [Arduino:XYZ] Oct 31 2015 00:47:48
Address : 8192
Pages : 3968
Page Size : 64 bytes
Total Size : 248KB
Planes : 1
Lock Regions : 16
Locked : readWord(addr=0x41004020)=0xffff
readWord(addr=0x41004020)=0xffff
readWord(addr=0x41004020)=0xffff
readWord(addr=0x41004020)=0xffff
readWord(addr=0x41004020)=0xffff
readWord(addr=0x41004020)=0xffff
readWord(addr=0x41004020)=0xffff
readWord(addr=0x41004020)=0xffff
readWord(addr=0x41004020)=0xffff
readWord(addr=0x41004020)=0xffff
readWord(addr=0x41004020)=0xffff
readWord(addr=0x41004020)=0xffff
readWord(addr=0x41004020)=0xffff
readWord(addr=0x41004020)=0xffff
readWord(addr=0x41004020)=0xffff
readWord(addr=0x41004020)=0xffff
none
readWord(addr=0x41004018)=0
Security : false
Boot Flash : true
readWord(addr=0x40000834)=0x7000a
BOD : true
readWord(addr=0x40000834)=0x7000a
BOR : true
Arduino : FAST_CHIP_ERASE
Arduino : FAST_MULTI_PAGE_WRITE
Arduino : CAN_CHECKSUM_MEMORY_BUFFER
Erase flash
chipErase(addr=0x2000)
done in 0.839 seconds

Write 11136 bytes to flash (174 pages)
write(addr=0x20005000,size=0x1000)
writeBuffer(scr_addr=0x20005000, dst_addr=0x2000, size=0x1000)

[=========== ] 36% (64/174 pages)write(addr=0x20005000,size=0x1000)
writeBuffer(scr_addr=0x20005000, dst_addr=0x3000, size=0x1000)

[====================== ] 73% (128/174 pages)write(addr=0x20005000,size=0xb80)
writeBuffer(scr_addr=0x20005000, dst_addr=0x4000, size=0xb80)

SAM-BA operation failed

[==============================] 100% (174/174 pages)
done in 0.099 seconds

Verify 11136 bytes of flash with checksum.
checksumBuffer(start_addr=0x2000, size=0x1000) = 8257
checksumBuffer(start_addr=0x3000, size=0x1000) = 66c7
checksumBuffer(start_addr=0x4000, size=0xb80) = a5f8
Verify successful
done in 0.051 seconds
CPU reset.
readWord(addr=0)=0x200023a8
readWord(addr=0xe000ed00)=0x410cc601
readWord(addr=0x41002018)=0x10010305
writeWord(addr=0xe000ed0c,value=0x5fa0004)

[facchinm]

Hi @cuyahoga ,
this issue is a duplicate of #4367 and probably of another couple of issues I'm unable to find right now. It should be solved by #4482, if you could test this IDE version and report the result here it would be great!

[cuyahoga]

My bad, thought I'd checked for a pre-existing issue, sorry.

Afraid that branch doesn't fix the problem. The board was on COM17, uploaded Blink and the port jumped to COM18 still. Deleted the cache in AppData before trying, in case there was anything in there affecting it. Anything else I should have done?

Sketch uses 10,988 bytes (4%) of program storage space. Maximum is 262,144 bytes.
Forcing reset using 1200bps open/close on port COM17
PORTS {COM3, COM17, } / {COM3, } => {}
PORTS {COM3, } / {COM3, } => {}
PORTS {COM3, } / {COM3, } => {}
PORTS {COM3, } / {COM3, COM18, } => {COM18, }
Found upload port: COM18
C:\Users\xxxxx\AppData\Local\Arduino15\packages\arduino\tools\bossac\1.6.1-arduino/bossac.exe -i -d --port=COM18 -U true -i -e -w -v C:\Users\xxxxx\AppData\Local\Temp\buildc47db500b84fc8cde939aff867398723.tmp/Blink.ino.bin -R
Set binary mode
readWord(addr=0)=0x200023a8
readWord(addr=0xe000ed00)=0x410cc601
readWord(addr=0x41002018)=0x10010305
version()=v1.1 [Arduino:XYZ] Oct 31 2015 00:47:48
chipId=0x10010005
Connected at 921600 baud
readWord(addr=0)=0x200023a8
readWord(addr=0xe000ed00)=0x410cc601
readWord(addr=0x41002018)=0x10010305
Atmel SMART device 0x10010005 found
write(addr=0x20004000,size=0x34)
writeWord(addr=0x20004030,value=0x10)
writeWord(addr=0x20004020,value=0x20008000)
Device : ATSAMD21G18A
readWord(addr=0)=0x200023a8
readWord(addr=0xe000ed00)=0x410cc601
readWord(addr=0x41002018)=0x10010305
Chip ID : 10010005
version()=v1.1 [Arduino:XYZ] Oct 31 2015 00:47:48
Version : v1.1 [Arduino:XYZ] Oct 31 2015 00:47:48
Address : 8192
Pages : 3968
Page Size : 64 bytes
Total Size : 248KB
Planes : 1
Lock Regions : 16
Locked : readWord(addr=0x41004020)=0xffff
readWord(addr=0x41004020)=0xffff
readWord(addr=0x41004020)=0xffff
readWord(addr=0x41004020)=0xffff
readWord(addr=0x41004020)=0xffff
readWord(addr=0x41004020)=0xffff
readWord(addr=0x41004020)=0xffff
readWord(addr=0x41004020)=0xffff
readWord(addr=0x41004020)=0xffff
readWord(addr=0x41004020)=0xffff
readWord(addr=0x41004020)=0xffff
readWord(addr=0x41004020)=0xffff
readWord(addr=0x41004020)=0xffff
readWord(addr=0x41004020)=0xffff
readWord(addr=0x41004020)=0xffff
readWord(addr=0x41004020)=0xffff
none
readWord(addr=0x41004018)=0
Security : false
Boot Flash : true
readWord(addr=0x40000834)=0x7000a
BOD : true
readWord(addr=0x40000834)=0x7000a
BOR : true
Arduino : FAST_CHIP_ERASE
Arduino : FAST_MULTI_PAGE_WRITE
Arduino : CAN_CHECKSUM_MEMORY_BUFFER
Erase flash
chipErase(addr=0x2000)
done in 0.839 seconds

Write 11136 bytes to flash (174 pages)
write(addr=0x20005000,size=0x1000)
writeBuffer(scr_addr=0x20005000, dst_addr=0x2000, size=0x1000)

[=========== ] 36% (64/174 pages)write(addr=0x20005000,size=0x1000)
writeBuffer(scr_addr=0x20005000, dst_addr=0x3000, size=0x1000)

[====================== ] 73% (128/174 pages)write(addr=0x20005000,size=0xb80)
writeBuffer(scr_addr=0x20005000, dst_addr=0x4000, size=0xb80)

SAM-BA operation failed

[==============================] 100% (174/174 pages)
done in 0.120 seconds

Verify 11136 bytes of flash with checksum.
checksumBuffer(start_addr=0x2000, size=0x1000) = 8257
checksumBuffer(start_addr=0x3000, size=0x1000) = 66c7
checksumBuffer(start_addr=0x4000, size=0xb80) = a5f8
Verify successful
done in 0.051 seconds
CPU reset.
readWord(addr=0)=0x200023a8
readWord(addr=0xe000ed00)=0x410cc601
readWord(addr=0x41002018)=0x10010305
writeWord(addr=0xe000ed0c,value=0x5fa0004)
Board at COM18 is not available

[facchinm]

Hopefully solved by merging #4792