I managed to obtain a logfile from the lvm command when it hangs: libdm-deptree.c:941 Resuming phenom-data2 (253:0) libdm-common.c:1153 Udev cookie 0xd4d0511 (semid 0) created libdm-common.c:1166 Udev cookie 0xd4d0511 (semid 0) incremented libdm-common.c:1054 Udev cookie 0xd4d0511 (semid 0) incremented libdm-common.c:1226 Udev cookie 0xd4d0511 (semid 0) assigned to dm_task type 5 with flags 0x0 ioctl/libdm-iface.c:1821 dm resume (253:0) NF [16384] libdm-common.c:828 phenom-data2: Stacking NODE_READ_AHEAD 256 (flags=1) libdm-common.c:1081 Udev cookie 0xd4d0511 (semid 0) decremented libdm-common.c:1276 Udev cookie 0xd4d0511 (semid 0): Waiting for zero
Obviously, lvm waits for udev to decrement the device-mapper task semaphore. A strange observation is that when looking at "ps ax" the PID(s) of udevd (437,829,839) suggest that udevd was started after the lvm tool (pid 355). Maybe there is a small time window when udevd is not able to perform the semaphore decrementation. ** Attachment added: "output of "ps ax" when "lvm vgchange -a y" hangs" https://bugs.launchpad.net/ubuntu/+source/lvm2/+bug/802626/+attachment/2296618/+files/ps-ax.out -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/802626 Title: boot hangs at initrd To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lvm2/+bug/802626/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
