** Changed in: linux (Ubuntu Trusty)
Status: Fix Committed = Fix Released
** Tags removed: kernel-bug-break-fix
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Title:
** Changed in: linux (Ubuntu Trusty)
Status: Confirmed = Fix Committed
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Title:
iostat: Cannot open /proc/stat: Cannot
** Changed in: linux (Ubuntu)
Status: Confirmed = Fix Released
** Tags removed: kernel-bug-break-fix
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Title:
iostat: Cannot
Will the patch be integrated in Saucy Salamander?
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Title:
iostat: Cannot open /proc/stat: Cannot allocate memory
Status in “linux”
I would doubt Saucy by now since it is almost EOL due to the reduced
support of non-LTS releases. Trusty should get it through the normal
upstream-stable path.
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** Also affects: linux (Ubuntu Trusty)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Trusty)
Importance: Undecided = Medium
** Changed in: linux (Ubuntu Trusty)
Status: New = Triaged
** Tags added: kernel-bug-break-fix
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** Changed in: linux (Ubuntu Trusty)
Status: Triaged = Confirmed
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Title:
iostat: Cannot open /proc/stat: Cannot allocate
** Description changed:
+ break-fix: 59a32e2ce5eb809967cac4e718bc527beca83c59
f74373a5cc7a0155d232c4e999648c7a95435bb2
+ break-fix: 59a32e2ce5eb809967cac4e718bc527beca83c59
058504edd02667eef8fac9be27ab3ea74332e9b4
+
Intermitently I get errors stating that various programs cannot allocate
It turns out we (you) were not the first ones running into it. The IBM
mainframe guys (obviously) have the same need to potentially allow many
CPUs. The upstream discussion is here:
https://lkml.org/lkml/2014/5/21/251
So, while the change I made does work in this case, it can cause issues.
Alright the test kernel clearly fixed the issue.
My gut tells me that there might be some memory leak also at play with
the non patched version, but I don't know kernel code well enough to
analyze that.
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So far after 21 days of uptime the issue hasn't come back.
# cat /proc/buddyinfo
Node 0, zone DMA 0 0 0 1 1 1 1 0
1 1 3
Node 0, zoneDMA32 9544583 7936174 3 1 1 0
0 0 0
Node 0, zone
Any news about how the test kernels did fare?
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Title:
iostat: Cannot open /proc/stat: Cannot allocate memory
Status in “linux”
I don't think we've had enough uptime with it as the buddyinfo still
looks like the bug wouldn't trigger.
May 22:
cat /proc/buddyinfo
Node 0, zone DMA 0 0 0 1 1 1 1 0
1 1 3
Node 0, zoneDMA32 84335 20475 5469995125 78
It looks like two things at play:
1. Something in the way the system is set up seems to the DMA/DMA32 pool under
higher pressure
2. Reading /proc/stat ends up requesting a 64kB memory area (order-4) in the
DMA32 pool on node0
While there are still two elements in the 64kB slot, they both are
This would be the proposed way of fixing the issue. I took a current 3.11
kernel version with the patch applied and prepared packages which can be found
at http://people.canonical.com/~smb/lp1319244/
Please could you try how this works on your system and report back here with
the results?
I've installed the kernel on one of the servers that is affected. It
might take a few days before there are any results though.
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On a freshish reboot (42 minutes) with some of the qemu VMs started
root@lg-host2:~# cat /proc/buddyinfo
Node 0, zone DMA 0 0 0 1 1 1 1 0
1 1 3
Node 0, zoneDMA32 6 4 9 7 7 7 5 3
4 1
** Tags added: patch
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Title:
iostat: Cannot open /proc/stat: Cannot allocate memory
Status in “linux” package in Ubuntu:
The main use of the system is as a QEMU/KVM host, with currently 14 VMs
running and some other processes.
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Title:
iostat: Cannot
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