Hey, Po-Hsu Lin.
I marked this as a duplicate of #1999554, as I did some research on it
before. So, many of these tests use a loop device and then try to clear
it. The clear function will retry multiple times because udev may have a
hold on the device. After a number of tries with some timeout, it will
emit that WARNING because the loop device failed to clear. That is
because udev still has a hold on it.
I debugged this and the reason for that is because udev will read
efivars every once in a while (instead of caching the results), and
reading efivar on those gcp instance types takes multiple seconds. That
has been causing other issues, like nbd being busy as well and that test
failing. I believe this should be fixed on udev.
Cascardo.
** Also affects: udev (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1999554
Title:
LTP uevent01 will fail on GCP n2d-standard-64
Status in linux package in Ubuntu:
Confirmed
Status in udev package in Ubuntu:
New
Bug description:
Because udev takes too long to release the loop device, LTP test
uevent01 (and some other tests) may warn about not being able to
detach the loop device. This is identified as a failure.
ubuntu@selfprovisioned-cascardo-n2d:~$ sudo ./uevent01
tst_test.c:1423: TINFO: Timeout per run is 0h 05m 00s
tst_device.c:88: TINFO: Found free device 6 '/dev/loop6'
uevent01.c:24: TINFO: Attaching device /dev/loop6
uevent.h:49: TINFO: Got uevent:
uevent.h:52: TINFO: change@/devices/virtual/block/loop6
uevent.h:52: TINFO: ACTION=change
uevent.h:52: TINFO: DEVPATH=/devices/virtual/block/loop6
uevent.h:52: TINFO: SUBSYSTEM=block
uevent.h:52: TINFO: DISK_MEDIA_CHANGE=1
uevent.h:52: TINFO: MAJOR=7
uevent.h:52: TINFO: MINOR=6
uevent.h:52: TINFO: DEVNAME=loop6
uevent.h:52: TINFO: DEVTYPE=disk
uevent.h:52: TINFO: DISKSEQ=7
uevent.h:52: TINFO: SEQNUM=2959
uevent.h:140: TPASS: Got expected UEVENT
uevent.h:49: TINFO: Got uevent:
uevent.h:52: TINFO: change@/devices/virtual/block/loop6
uevent.h:52: TINFO: ACTION=change
uevent.h:52: TINFO: DEVPATH=/devices/virtual/block/loop6
uevent.h:52: TINFO: SUBSYSTEM=block
uevent.h:52: TINFO: MAJOR=7
uevent.h:52: TINFO: MINOR=6
uevent.h:52: TINFO: DEVNAME=loop6
uevent.h:52: TINFO: DEVTYPE=disk
uevent.h:52: TINFO: DISKSEQ=7
uevent.h:52: TINFO: SEQNUM=2960
uevent.h:140: TPASS: Got expected UEVENT
uevent01.c:26: TINFO: Detaching device /dev/loop6
tst_device.c:254: TWARN: ioctl(/dev/loop6, LOOP_CLR_FD, 0) no ENXIO for too
long
Summary:
passed 2
failed 0
broken 0
skipped 0
warnings 1
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