Public bug reported:
$ virsh start cosmic-i386
error: Failed to start domain cosmic-i386
error: internal error: child reported: Kernel does not provide mount namespace:
Permission denied
Happens with 4.18 only, 4.17 is fine.
27013 openat(AT_FDCWD, "/proc/27012/ns/mnt", O_RDONLY) = -1 EACCES
(Permission denied)
Opening a self or parent mount namespace works fine as tested with cat
/proc/self/ns/mnt and cat /proc/self/$$/mnt. Still investigating.
** Affects: linux (Ubuntu)
Importance: High
Assignee: Thadeu Lima de Souza Cascardo (cascardo)
Status: In Progress
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Thadeu Lima de Souza Cascardo (cascardo)
** Changed in: linux (Ubuntu)
Importance: Undecided => High
** Changed in: linux (Ubuntu)
Status: New => Confirmed
** Changed in: linux (Ubuntu)
Status: Confirmed => In Progress
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https://bugs.launchpad.net/bugs/1788603
Title:
libvirt fails with failure to open mount namespace
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