failed to allocate device WQ

[Holger Kiehl]

Hello,

since upgrading from kernel 6.10 to 6.11 (also 6.12) one Infiniband
card sometimes hits this error:

   kernel: workqueue: Failed to create a rescuer kthread for wq "ipoib_wq": -EINTR
   kernel: ib0: failed to allocate device WQ
   kernel: mlx5_1: failed to initialize device: ib0 port 1 (ret = -12)
   kernel: mlx5_1: couldn't register ipoib port 1; error -12

The system has two cards:

   41:00.0 Infiniband controller: Mellanox Technologies MT28908 Family [ConnectX-6]
   c4:00.0 Infiniband controller: Mellanox Technologies MT28908 Family [ConnectX-6]

If that happens one cannot use that card for TCP/IP communication. It does
not always happen, but when it does it always happens with the second
card mlx5_1. Never with mlx5_0. This happens on four different systems.

Any idea what I can do to stop this from happening?

Regards,
Holger

PS: Firmware for both cards is 20.41.1000