CentOS - Aug 2016 - CentOS 6.8 with current kernel fails with pm-hibernate (cifsd refuses to freeze)

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Now, this is not apparently very common to CentOS or EL server, but I
need to hibernate one of myservers after a batch job daily. Current
kernel appears to fail with pm-hibernate now.

$ cat /etc/redhat-release
CentOS release 6.8 (Final)

$ uname -a
Linux xxxx 2.6.32-642.3.1.el6.x86_64 #1 SMP Tue Jul 12 18:30:56 UTC 2016
x86_64 x86_64 x86_64 GNU/Linux

pm-hibernate tries but apparently fails.

cpuinfo:
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 15
model		: 4
model name	: Intel(R) Pentium(R) 4 CPU 3.00GHz
stepping	: 3
microcode	: 5
cpu MHz		: 2999.964
cache size	: 2048 KB
physical id	: 0
siblings	: 2
core id		: 0
cpu cores	: 1
apicid		: 0
initial apicid	: 0
fpu		: yes
fpu_exception	: yes
cpuid level	: 5
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm
constant_tsc pebs bts pni dtes64 monitor ds_cpl est cid cx16 xtpr
bogomips	: 5999.92
clflush size	: 64
cache_alignment	: 128
address sizes	: 36 bits physical, 48 bits virtual
power management:

processor	: 1
vendor_id	: GenuineIntel
cpu family	: 15
model		: 4
model name	: Intel(R) Pentium(R) 4 CPU 3.00GHz
stepping	: 3
microcode	: 5
cpu MHz		: 2999.964
cache size	: 2048 KB
physical id	: 0
siblings	: 2
core id		: 0
cpu cores	: 1
apicid		: 1
initial apicid	: 1
fpu		: yes
fpu_exception	: yes
cpuid level	: 5
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm
constant_tsc pebs bts pni dtes64 monitor ds_cpl est cid cx16 xtpr
bogomips	: 5999.92
clflush size	: 64
cache_alignment	: 128
address sizes	: 36 bits physical, 48 bits virtual
power management:


Track dump here: https://static.bitwell.biz/trace.txt

OK. Last line says the process causing this is cifsd.

Anything to fix this?

- -- 
jarif at iki.fi
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OK. I fixed this case just by dismounting the share before hibernate,
but I'll leave this here anyway. Just a historic note or something ;)

- -- 
jarif at iki.fi
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Hello Jari,


On Tue, 02 Aug 2016 23:15:21 +0300 Jari Fredriksson <jarif at iki.fi>
wrote:
> OK. I fixed this case just by dismounting the share before hibernate,
> but I'll leave this here anyway. Just a historic note or something ;)
I think this is a very common issue: cifs vs hibernation, it's not only
this kernel, nor CentOS6. I tried hard when facing this issue, and
automount could provide good results in auto-unmounting, but it's far
from a 100% success. Manually unmounting before hibernating is for now
the only solution I've found.


Regards,

-- 
wwp
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