On 11/24/2014 04:09 PM, Juergen Gross wrote:
On 11/24/2014 11:59 AM, Juergen Gross wrote:
On 11/24/2014 11:20 AM, Jan Beulich wrote:
On 24.11.14 at 10:55, <jgr...@suse.com> wrote:
- Sometimes I see only NMI watchdog messages, looking into hanging cpu
state via xen debug keys I can see the cpu(s) in question are
spinning
in _raw_spin_lock():
__handle_mm_fault()->__pte_alloc()->pmd_lock()->_raw_spin_lock()
The hanging cpus were executing some random user processes (cron,
bash, xargs), cr2 contained user addresses.
Is this perhaps what
http://lists.xenproject.org/archives/html/xen-devel/2014-11/msg02135.html
appears to be about?
Hmm, I'm not sure.
I'll try a 3.17 kernel to verify.
Still seeing the issue, but less frequent. OTOH I just found in above
thread in lkml that 3.17 is showing that issue, too. :-(
I'll try to setup a pv-variant of Linus' patch and test it...
Okay, test survived the night. Seems really to be the same issue.
I think I'm seeing the qemu issue now Ian mentioned:
[ 140.182849] xen:grant_table: WARNING: g.e. 0x10 still in use!
[ 140.182859] deferring g.e. 0x10 (pfn 0xffffffffffffffff)
[ 140.182864] xen:grant_table: WARNING: g.e. 0xf still in use!
[ 140.182866] deferring g.e. 0xf (pfn 0xffffffffffffffff)
...
[ 140.183128] xen:grant_table: WARNING: g.e. 0x2a still in use!
[ 140.183129] deferring g.e. 0x2a (pfn 0xffffffffffffffff)
[ 142.182274] xen:grant_table: freeing g.e. 0x9
[ 145.182284] xen:grant_table: freeing g.e. 0x44
[ 147.182272] xen:grant_table: freeing g.e. 0x43
[ 501.182282] xen:grant_table: g.e. 0x10 still pending
[ 501.182315] xen:grant_table: g.e. 0xf still pending
...
I'll update qemu and try again...
Juergen
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