On Mon, Jan 13, 2014 at 10:37:58AM +0100, Umut Tezduyar Lindskog wrote:
> Hi,
>
> .device units stopped showing up for me in git systemd since somewhere around
> mid-december. I have noticed that udevd and even udevadm monitor receives the
> kernel events but systemd itself never receives them.
>
> Further debugging, I have found out device_dispatch_io() (src/core/device.c)
> is never being called. It seemed like systemd binary is never aware of kernel
> events. I have proved this by:
>
> 1) strace -p 1
> 2) udevadm monitor
> 3) echo add > /sys/devices/platform/elk/net/eth0/uevent
> 4) Looking at the output of strace, nothing is changed, it is still in
> epoll_wait.
> Process 1 attached - interrupt to quit
> clock_gettime(CLOCK_MONOTONIC, {1030, 364651245}) = 0
> epoll_wait(4,
> 5) Looking at udevadm I can see the event being received.
> monitor will print the received events for:
> UDEV - the event which udev sends out after rule processing
> KERNEL - the kernel uevent
>
> KERNEL[1064.673596] add /devices/platform/elk/net/eth0 (net)
> UDEV [1064.983686] add /devices/platform/elk/net/eth0 (net)
>
> I have asked around in IIRC and seems like no one else is having the same
> problem. Before I further debug it, I wanted to check if something else might
> be stealing the epoll events from systemd or if anyone else has a suggestion.
I'd use lsof to check that PID 1 has KOJBECT_UEVENT open, and then
attach gdb to it is stored in the right places.
Zbyszek
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