FS#2733 - Ath79 firmware accident enter to failsafe mode when reboot/reflash router.

[openwrt-bot]

linhtinh:

Sometime when reboot/reflash router, I see serial console messages:
[ 5.868712] init: - preinit -
[ 5.960699] random: procd: uninitialized urandom read (4 bytes read)
[ 6.909058] random: jshn: uninitialized urandom read (4 bytes read)
[ 7.327749] random: jshn: uninitialized urandom read (4 bytes read)
[ 7.567130] random: jshn: uninitialized urandom read (4 bytes read)
[ 7.638687] random: jshn: uninitialized urandom read (4 bytes read)
Press the [f] key and hit [enter] to enter failsafe mode
Press the [1], [2], [3] or [4] key and hit [enter] to select the debug level
[ 9.860896] eth0: link up (1000Mbps/Full duplex)

• failsafe button rfkill was pressed -
• failsafe -
  [ 12.309911] urandom_read: 3 callbacks suppressed
  [ 12.309921] random: dropbearkey: uninitialized urandom read (32 bytes read)
  Generating 1024 [ 12.323834] random: dropbearkey: uninitialized urandom read (32 bytes read)
  bit rsa key, this may take a while...
  Public key portion is:
  ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAAAgQCKZVT/UJoTHz2CkNHrYmfzzBDfa/6Yd6+LJVcrURD15lbN3ch7AG/tc/ZolkeOrqkKD6dM2h4TsYv4+)
  Fingerprint: sha1!! b9:a4:d3:94:71:b3:34:ae:a3:85:c8:e9:a7:c8:63:fd:74:52:5e:ad

BusyBox v1.30.1 () built-in shell (ash)

ash: can't access tty; job control turned off

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OpenWrt 19.07-SNAPSHOT, r10868-08d9828b76

================= FAILSAFE MODE active ================

I noticed when wifi on/off switch on router is on, sometime it accident enter failsafe mode. If switch to off, it's not happen.
Issue happens with 841n v8/v9/v10 & 841hp v3 (same hardware as v9/10) model.

[openwrt-bot]

adrianschmutzler:

• failsafe button rfkill was pressed -

So, this tells us that the router thinks the rfkill button was pressed. With the 841n v8, it appears that rfkill is actually a switch, so having it "enabled" would permanently send "button pressed" ...

However, this only applies to the 841n v8. For 841n v9/v10, the button is actually a button and the problem should not occur.

[openwrt-bot]

adrianschmutzler:

Created a PR for the 841n v8 here: #3184

[openwrt-bot]

adrianschmutzler:

Fixed for v8 in 5e86877

As the v9/v10 are different, I'm closing this now.

Please resubmit for v9/v10 when you can reproduce the problem there.