Skip to content

Novatel 551L: Infinite EAGAIN loop when reading from cdc-wdm port

The Verizon Wireless USB551L (1410:b001) may get completely stuck/dead, and in this state, the qmi-proxy ends up entering an infinite loop of poll()->read()->EAGAIN->poll()->read()->EAGAIN()...

Attaching an strace of the qmi-proxy in this state.20181011-novatel-551l-eagain-loop.log

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information