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ffacilities
Beginner

SYS-2-INTSCHED: 'may_suspend' at level 4 -Process= "Per-minute Jobs"

On a 2911 running IOS 15.4(3)M2 and configured for fax on-ramp/off-ramp, we've seen the following group of logs occur twice recently, on Dec 2 and Jan 21:

Jan 21 06:27:42.349 CST: %SYS-2-INTSCHED: 'may_suspend' at level 4  -Process= "Per-minute Jobs", ipl= 4, pid= 87
-Traceback= 30058264z 35E25D34z 35E26018z 35E23540z 357CEE38z 35E27FF0z 35E28094z 371F3F4Cz 35E27E3Cz 300668C0z 3076C364z 300329D0z 300329B4z
Jan 21 06:27:42.349 CST: %SYS-2-INTSCHED: 'may_suspend' at level 4  -Process= "Per-minute Jobs", ipl= 4, pid= 87
-Traceback= 30058264z 35E25D58z 35E26018z 35E23540z 357CEE38z 35E27FF0z 35E28094z 371F3F4Cz 35E27E3Cz 300668C0z 3076C364z 300329D0z 300329B4z
Jan 21 06:27:42.349 CST: %SYS-2-INTSCHED: 'may_suspend' at level 4  -Process= "Per-minute Jobs", ipl= 4, pid= 87
-Traceback= 30058264z 35E25D7Cz 35E26018z 35E23540z 357CEE38z 35E27FF0z 35E28094z 371F3F4Cz 35E27E3Cz 300668C0z 3076C364z 300329D0z 300329B4z

The unit has been up since October.  We've never seen logs like these before across more than 100 similar units (both 2811 and 2911) running various IOS versions and configured in the same way.

From some research I understand that this indicates that the scheduler 'might' suspend the Per-minute Jobs process, but why would the Per-minute Jobs process cause that?

I don't see anything unusual about the memory/CPU usage of Per-minute Jobs process.

From 'show proc mem sort':

Processor Pool Total:  203576508 Used:   67973116 Free:  135603392
      I/O Pool Total:  117440512 Used:   21620288 Free:   95820224

 PID TTY  Allocated      Freed    Holding    Getbufs    Retbufs Process
...
  87   0  490324520  982579900       7264          0          0 Per-minute Jobs

From 'show proc cpu sort':

CPU utilization for five seconds: 2%/0%; one minute: 2%; five minutes: 2%
 PID Runtime(ms)     Invoked      uSecs   5Sec   1Min   5Min TTY Process
...
  87     2055056      354491       5797  0.00%  0.02%  0.00%   0 Per-minute Jobs

Any ideas as to what might cause the Per-minute jobs process to come under the scheduler's spotlight?

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