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Sounds like I have this issue, too. There are two PCs with the issue.

The first one: Intel i5, Asrock Z68 Extreme 3 Gen 3, Samsung 840 Evo SSD 250GB, UEFI (non-secure), GPT, BTRFS root, NVIDIA 680 with Nvidia drivers. Pretty standard Fedora 21 installation except for the BTRFS root filesystem (I did save /home from a previous installation, though).

This PC has issues booting almost every time. It stops at about the same point as referred to in the first post. If you wait about 4 minutes, you get to the rescue prompt and it will often say that "mounting /sysroot failed". If you select another kernel upon boot (which one doesn't seem to matter), you have a better chance to start the system, it seems. The problem is with both 3.18 and 3.19 kernels. There is nothing in the logs indicating what is wrong.

The strange thing is that sometimes you can boot a couple of times in a row. Other times it won't boot the same kernel no matter what (I think I tried almost ten times). And then when selecting another kernel, it suddenly works. Then the next day, you can't boot the kernel that worked yesterday. I can't see a pattern here.

The second one: Intel i7, Asrock Z97 Extreme 4, Two 450 GB SAS disks in RAID 1 on LSI SAS controller, UEFI (non-secure), GPT, BTRFS root, NVIDIA 670 with Nvidia drivers. Pretty standard Fedora 21 installation, except for the BTRFS root, and with home on separate 1 GB disk. This PC has only experienced this issue a couple of times. It is not booted often, though.

Sounds like I have this issue, too. There are two PCs with the issue.

The first one: Intel i5, Asrock Z68 Extreme 3 Gen 3, Samsung 840 Evo SSD 250GB, UEFI (non-secure), GPT, BTRFS root, NVIDIA 680 with Nvidia drivers. Pretty standard Fedora 21 installation except for the BTRFS root filesystem (I did save /home from a previous installation, though).

This PC has issues booting almost every time. It stops at about the same point as referred to in the first post. If you wait about 4 minutes, you get to the rescue prompt and it will often say that "mounting /sysroot failed". If you select another kernel upon boot (which one doesn't seem to matter), you have a better chance to start the system, it seems. The problem is with both 3.18 and 3.19 kernels. There is nothing in the logs indicating what is wrong.

The strange thing is that sometimes you can boot a couple of times in a row. Other times it won't boot the same kernel no matter what (I think I tried almost ten times). And then when selecting another kernel, it suddenly works. Then the next day, you can't boot the kernel that worked yesterday. I can't see a pattern here.

The second one: Intel i7, Asrock Z97 Extreme 4, Two 450 GB SAS disks in RAID 1 on LSI SAS controller, UEFI (non-secure), GPT, BTRFS root, NVIDIA 670 with Nvidia drivers. Pretty standard Fedora 21 installation, except for the BTRFS root, and with home on separate 1 GB disk. This PC has only experienced this issue a couple of times. It is not booted often, though.

Edit: No solution yet, but I highly suspect it is btrfs that is the problem here.

Edit: I think I have fixed the issue on my system now. I compiled a new kernel with this patch: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=9c4f61f01d269815bb7c37be3ede59c5587747c6

I have booted several times now and the problem seems to be gone. The solution was referred to here: https://ask.fedoraproject.org/en/question/66883/f21-btrfs-luks-wont-boot-on-319x-x-kernel/


Sounds like I have this issue, too. There are two PCs with the issue.

The first one: Intel i5, Asrock Z68 Extreme 3 Gen 3, Samsung 840 Evo SSD 250GB, UEFI (non-secure), GPT, BTRFS root, NVIDIA 680 with Nvidia drivers. Pretty standard Fedora 21 installation except for the BTRFS root filesystem (I did save /home from a previous installation, though).

This PC has issues booting almost every time. It stops at about the same point as referred to in the first post. If you wait about 4 minutes, you get to the rescue prompt and it will often say that "mounting /sysroot failed". If you select another kernel upon boot (which one doesn't seem to matter), you have a better chance to start the system, it seems. The problem is with both 3.18 and 3.19 kernels. There is nothing in the logs indicating what is wrong.

The strange thing is that sometimes you can boot a couple of times in a row. Other times it won't boot the same kernel no matter what (I think I tried almost ten times). And then when selecting another kernel, it suddenly works. Then the next day, you can't boot the kernel that worked yesterday. I can't see a pattern here.

The second one: Intel i7, Asrock Z97 Extreme 4, Two 450 GB SAS disks in RAID 1 on LSI SAS controller, UEFI (non-secure), GPT, BTRFS root, NVIDIA 670 with Nvidia drivers. Pretty standard Fedora 21 installation, except for the BTRFS root, and with home on separate 1 GB disk. This PC has only experienced this issue a couple of times. It is not booted often, though.

Edit: No solution yet, but I highly suspect it is btrfs that is the problem here.