[ Originally reported at: https://github.com/openSUSE/libstorage-ng/issues/664
]
I added an lvmcache cachepool to the LV for my root filesystem, and now YaST's
bootloader module fails due to not being able to detect the root filesystem.
How to reproduce:
1. Start with lvmcache disabled (i.e. normal LVM / filesystem, backed by
mdraid)
2. Observe `yast2 bootloader` works fine
3. Activate the cache LV which I previously setup:
lvconvert --type cache --cachepool system/cache-root system/root
4. Run `yast2 bootloader` again
5. Observe that an Error dialog pops up, filled with a) lots of (apparently
harmless) warnings about an fd leak, and b) an error right at the end showing
that it cannot find the disk by LVM UUID:
Execution of command "[["/usr/bin/grub2-editenv", "list"]]" failed. Exit
code: 1 Error output: File descriptor 7 (pipe:[4428632]) leaked on vgs
invocation. Parent PID 18319: /usr/bin/grub2-editenv File descriptor 8
(pipe:[4428632]) leaked on vgs invocation. Parent PID 18319:
/usr/bin/grub2-editenv File descriptor 9 (pipe:[4428633]) leaked on vgs
invocation. Parent PID 18319: /usr/bin/grub2-editenv File descriptor 10
(pipe:[4428633]) leaked on vgs invocation. Parent PID 18319:
/usr/bin/grub2-editenv File descriptor 7 (pipe:[4428632]) leaked on vgs
invocation. Parent PID 18319: /usr/bin/grub2-editenv File descriptor 8
(pipe:[4428632]) leaked on vgs invocation. Parent PID 18319:
/usr/bin/grub2-editenv File descriptor 9 (pipe:[4428633]) leaked on vgs
invocation. Parent PID 18319: /usr/bin/grub2-editenv File descriptor 10
(pipe:[4428633]) leaked on vgs invocation. Parent PID 18319:
/usr/bin/grub2-editenv File descriptor 7 (pipe:[4428632]) leaked on vgs
invocation. Parent PID 18319: /usr/bin/grub2-editenv File descriptor 8
(pipe:[4428632]) leaked on vgs invocation. Parent PID 18319:
/usr/bin/grub2-editenv File descriptor 9 (pipe:[4428633]) leaked on vgs
invocation. Parent PID 18319: /usr/bin/grub2-editenv File descriptor 10
(pipe:[4428633]) leaked on vgs invocation. Parent PID 18319:
/usr/bin/grub2-editenv File descriptor 7 (pipe:[4428632]) leaked on vgs
invocation. Parent PID 18319: /usr/bin/grub2-editenv File descriptor 8
(pipe:[4428632]) leaked on vgs invocation. Parent PID 18319:
/usr/bin/grub2-editenv File descriptor 9 (pipe:[4428633]) leaked on vgs
invocation. Parent PID 18319: /usr/bin/grub2-editenv File descriptor 10
(pipe:[4428633]) leaked on vgs invocation. Parent PID 18319:
/usr/bin/grub2-editenv File descriptor 7 (pipe:[4428632]) leaked on vgs
invocation. Parent PID 18319: /usr/bin/grub2-editenv File descriptor 8
(pipe:[4428632]) leaked on vgs invocation. Parent PID 18319:
/usr/bin/grub2-editenv File descriptor 9 (pipe:[4428633]) leaked on vgs
invocation. Parent PID 18319: /usr/bin/grub2-editenv File descriptor 10
(pipe:[4428633]) leaked on vgs invocation. Parent PID 18319:
/usr/bin/grub2-editenv File descriptor 7 (pipe:[4428632]) leaked on vgs
invocation. Parent PID 18319: /usr/bin/grub2-editenv File descriptor 8
(pipe:[4428632]) leaked on vgs invocation. Parent PID 18319:
/usr/bin/grub2-editenv File descriptor 9 (pipe:[4428633]) leaked on vgs
invocation. Parent PID 18319: /usr/bin/grub2-editenv File descriptor 10
(pipe:[4428633]) leaked on vgs invocation. Parent PID 18319:
/usr/bin/grub2-editenv File descriptor 7 (pipe:[4428632]) leaked on vgs
invocation. Parent PID 18319: /usr/bin/grub2-editenv File descriptor 8
(pipe:[4428632]) leaked on vgs invocation. Parent PID 18319:
/usr/bin/grub2-editenv File descriptor 9 (pipe:[4428633]) leaked on vgs
invocation. Parent PID 18319: /usr/bin/grub2-editenv File descriptor 10
(pipe:[4428633]) leaked on vgs invocation. Parent PID 18319:
/usr/bin/grub2-editenv File descriptor 7 (pipe:[4428632]) leaked on vgs
invocation. Parent PID 18319: /usr/bin/grub2-editenv File descriptor 8
(pipe:[4428632]) leaked on vgs invocation. Parent PID 18319:
/usr/bin/grub2-editenv File descriptor 9 (pipe:[4428633]) leaked on vgs
invocation. Parent PID 18319: /usr/bin/grub2-editenv File descriptor 10
(pipe:[4428633]) leaked on vgs invocation. Parent PID 18319:
/usr/bin/grub2-editenv /usr/bin/grub2-editenv: error: disk
`lvmid/m4f2UJ-widt-pyk9-QkKY-KyJQ-pbwq-V8zzwL/MsUIK0-r51d-MJck-aQwk-ZiAS-A2BI-XdT2vl'
not found.
6. Click OK (the only available button) on this dialog
7. Now I see the same dialog I originally reported at the top of this issue.
8. Click `Continue`
9. Observe another dialog:
Probing file system with UUID cad8b62c-88e5-4c19-ad24-06e75c0a8987
failed
Unexpected situation found in the system.
Click below to see more details (English only).
Continue despite the error?
Continue Abort Details
10. Clicking `Details` shows:
device not found, name:/dev/mapper/system-root
11. Click `OK` then `Continue` to continue despite the error
12. Observe another error dialog:
Internal error. Please report a bug report with logs.
Run save_y2logs to get complete logs.
Caller: /usr/share/YaST2/modules/BootStorage.rb:246:in `detect_disks'
Details: Missing '/' mount point
13. Click `OK` and yast exits.
Clearly there is some side effect of attaching the cache LV which somehow
confuses the disk detection code. I see in the error above that it's looking
for
`lvmid/m4f2UJ-widt-pyk9-QkKY-KyJQ-pbwq-V8zzwL/MsUIK0-r51d-MJck-aQwk-ZiAS-A2BI-XdT2vl`,
which seems to correspond OK to the uuids shown here:
# dmsetup info system-root
Name: system-root
State: ACTIVE
Read Ahead: 1024
Tables present: LIVE
Open count: 1
Event number: 0
Major, minor: 254, 0
Number of targets: 1
UUID: LVM-m4f2UJwidtpyk9QkKYKyJQpbwqV8zzwLMsUIK0r51dMJckaQwkZiASA2BIXdT2vl
# lvdisplay system/root
--- Logical volume ---
LV Path /dev/system/root
LV Name root
VG Name system
LV UUID MsUIK0-r51d-MJck-aQwk-ZiAS-A2BI-XdT2vl
LV Write Access read/write
LV Creation host, time install, 2018-12-31 13:15:41 +0000
LV Cache pool name cache-root
LV Cache origin name root_corig
LV Status available
# open 1
LV Size 500.00 GiB
Cache used blocks 0.04%
Cache metadata blocks 6.47%
Cache dirty blocks 0.00%
Cache read hits/misses 2 / 15
Cache wrt hits/misses 653 / 572
Cache demotions 0
Cache promotions 336
Current LE 128000
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 1024
Block device 254:0