Failed to write to hcidump.pklg - :enospc

[philipgiuliani]

I have created a clean nerves project which is running the example of #57 . After around 4 hours of execution I got the following logs spammed in my console:

10:51:22.592 [info]  Plant #1 - moisture: 30
10:51:32.577 [info]  Plant #1 - fertility: 168
10:51:42.607 [info]  Plant #1 - temperature: 25.1
10:51:53.588 [info]  Plant #1 - lux: 249
10:52:02.579 [info]  Plant #1 - moisture: 30
10:52:12.592 [info]  Plant #1 - fertility: 165
10:52:22.600 [info]  Plant #1 - temperature: 25.1
10:52:32.619 [info]  Plant #1 - lux: 249
10:52:42.585 [info]  Plant #1 - moisture: 30
10:52:45.081 [warn]  Failed to write to hcidump.pklg - :enospc
10:52:45.083 [debug] HCI Packet in <<0x3E, 0xC, 0x2, 0x1, 0x4, 0x1, 0x38, 0xE3, 0x57, 0x3B, 0x5D, 0x65, 0x0, 0xB0>>
10:52:45.135 [warn]  Failed to write to hcidump.pklg - :enospc
10:52:45.137 [debug] HCI Packet in <<0x3E, 0x2B, 0x2, 0x1, 0x2, 0x1, 0x4C, 0x7F, 0x0, 0x5A, 0x38, 0x53, 0x1F, 0x1E, 0xFF, 0x4C, 0x0, 0x7, 0x19, 0x1, 0xE, 0x20, 0x2B, 0x77, 0x8F, 0x1, 0x0, 0x5, 0x64, 0xCC, 0x48, 0x3A, 0x55, 0x3D, 0x4C, 0x7C, 0x65, 0x93, 0xCE, 0xAA, 0x22, 0x55, 0x92, 0xAB, 0xBE>>
10:52:45.146 [warn]  Failed to write to hcidump.pklg - :enospc
10:52:45.149 [debug] HCI Packet in <<0x3E, 0x2B, 0x2, 0x1, 0x3, 0x1, 0xCB, 0x6B, 0xA7, 0xAC, 0x9B, 0x25, 0x1F, 0x1E, 0xFF, 0x6, 0x0, 0x1, 0x9, 0x20, 0x2, 0x1, 0x16, 0x59, 0xFD, 0xCE, 0x70, 0xC7, 0xF3, 0x8E, 0x12, 0x5, 0xD7, 0x9C, 0xF2, 0xED, 0xC2, 0xA7, 0xA5, 0xEB, 0xBA, 0x8, 0x57, 0x19, 0xBB>>
10:52:45.169 [warn]  Failed to write to hcidump.pklg - :enospc
10:52:45.172 [debug] HCI Packet in <<0x3E, 0x2A, 0x2, 0x1, 0x0, 0x1, 0xE0, 0x39, 0x93, 0x4D, 0x45, 0x41, 0x1E, 0x2, 0x1, 0x2, 0x13, 0xFF, 0xFF, 0xFF, 0x32, 0x35, 0x61, 0x66, 0x61, 0x37, 0x38, 0x61, 0x66, 0x35, 0x38, 0x32, 0x63, 0x35, 0x33, 0x34, 0x2, 0xA, 0xF1, 0x3, 0x3, 0x56, 0x34, 0xD5>>
10:52:45.200 [warn]  Failed to write to hcidump.pklg - :enospc
10:52:45.203 [debug] HCI Packet in <<0x3E, 0x14, 0x2, 0x1, 0x4, 0x1, 0xE0, 0x39, 0x93, 0x4D, 0x45, 0x41, 0x8, 0x7, 0x9, 0x53, 0x48, 0x49, 0x45, 0x4C, 0x44, 0xD5>>
10:52:45.235 [warn]  Failed to write to hcidump.pklg - :enospc
10:52:45.238 [debug] HCI Packet in <<0x3E, 0x2B, 0x2, 0x1, 0x3, 0x1, 0xFB, 0x16, 0xC3, 0xC1, 0x46, 0x40, 0x1F, 0x1E, 0xFF, 0x6, 0x0, 0x1, 0x9, 0x20, 0x2, 0xAF, 0xB4, 0x68, 0x75, 0xB, 0xD, 0x98, 0x7B, 0x5A, 0xF3, 0x1A, 0x3F, 0x75, 0x52, 0x4A, 0x6, 0x31, 0xEE, 0xF8, 0x5E, 0x48, 0xF5, 0xB9, 0xBA>>
10:52:45.254 [warn]  Failed to write to hcidump.pklg - :enospc
10:52:45.257 [debug] HCI Packet in <<0x3E, 0x1A, 0x2, 0x1, 0x0, 0x1, 0x7A, 0x8C, 0xD8, 0x4B, 0x2A, 0x63, 0xE, 0x2, 0x1, 0x6, 0xA, 0xFF, 0x4C, 0x0, 0x10, 0x5, 0x1, 0x1C, 0x19, 0x2D, 0x52, 0xBB>>
10:52:45.274 [warn]  Failed to write to hcidump.pklg - :enospc
10:52:45.277 [debug] HCI Packet in <<0x3E, 0x1D, 0x2, 0x1, 0x0, 0x1, 0x5D, 0x15, 0xDD, 0xE9, 0x8, 0x45, 0x11, 0x2, 0x1, 0x1A, 0x2, 0xA, 0x18, 0xA, 0xFF, 0x4C, 0x0, 0x10, 0x5, 0xD, 0x98, 0x88, 0xBE, 0xFE, 0xB6>>
10:52:45.297 [warn]  Failed to write to hcidump.pklg - :enospc
10:52:45.299 [debug] HCI Packet in <<0x3E, 0x2B, 0x2, 0x1, 0x3, 0x1, 0x35, 0x90, 0x8F, 0x5D, 0x17, 0x30, 0x1F, 0x1E, 0xFF, 0x6, 0x0, 0x1, 0x9, 0x20, 0x2, 0xED, 0xAB, 0xCC, 0xE, 0xFD, 0x3A, 0x93, 0xD3, 0x30, 0x31, 0x6E, 0x31, 0x94, 0x25, 0x31, 0xB2, 0x78, 0x13, 0x6B, 0xCD, 0x10, 0x91, 0x19, 0xBB>>
... logs go on forever

What could the reason for this be? My df -h output looks like this:

Filesystem                Size      Used Available Use% Mounted on
/dev/root                27.4M     27.4M         0 100% /
devtmpfs                  1.0M         0      1.0M   0% /dev
tmpfs                    30.9M      8.0K     30.9M   0% /tmp
tmpfs                    15.5M      4.0K     15.5M   0% /run
/dev/mmcblk0p1           18.7M      5.9M     12.8M  32% /boot
/dev/mmcblk0p3           56.7G    148.0K     53.8G   0% /root
tmpfs                     1.0M         0      1.0M   0% /sys/fs/cgroup

[philipgiuliani]

Ok I found it, seems that blue_heron is logging a hci_dump file by default:

      with true <- Application.get_env(:blue_heron, :log_hci_dump_file, true),
           :ok <- File.write("/tmp/hcidump.pklg", encoded, [:append]) do

I think this should be false by default since it could produce some huge files after running for a while - and if you are not aware it could crash a production environment.