I think I got it: With "pidof udevd" I determined the udev subprocess
which runs the callouts and rules, straced it, and now see the cause:
9782
open("/sys/devices/pci0000:00/0000:00:1f.2/host1/target1:0:0/1:0:0:0/block",
O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = -1 EMFILE (Too many open files)
9782
open("/sys/devices/pci0000:00/0000:00:1f.2/host1/target1:0:0/1:0:0:0/block/*/uevent",
O_WRONLY|O_CREAT|O_TRUNC, 0666) = -1 EMFILE (Too many open files)
9782 socket(PF_FILE, 0x80002 /* SOCK_??? */, 0) = -1 EMFILE (Too many open
files)
9782 open("/dev/console", O_WRONLY|O_NOCTTY) = -1 EMFILE (Too many open files)
9782 unlink("/dev/.udev/db/scsi:1:0:0:0") = -1 ENOENT (No such file or
directory)
9782 socket(PF_FILE, SOCK_DGRAM, 0) = -1 EMFILE (Too many open files)
9782 socket(PF_FILE, 0x80002 /* SOCK_??? */, 0) = -1 EMFILE (Too many open
files)
9782 open("/dev/console", O_WRONLY|O_NOCTTY) = -1 EMFILE (Too many open files)
[...]
That explains why restarting udev cures this. It seems that there is an
fd leak somewhere.
** Summary changed:
- Usb Media not automaticaly mounted
+ devices not detected -- too many open files
--
devices not detected -- too many open files
https://bugs.launchpad.net/bugs/463347
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