[Crash-utility] ps: issue with "waking" and "parked" task states?

[Michael Holzheu]

Hi Dave,

I recently looked into a linux 4.0 dump where the "ps" command prints "??"
for the state field of several tasks:

crash> ps
    741    660   1      7b408000      ??   0.0    2152   2592  chcpu
    748      2  24      20c284f00     IN   0.0       0      0  [migration/24]
    752      2  22      20b1ccf00     ??   0.0       0      0  [migration/25]

Looking at the "task_struct->state" I get the following:

 crash> task_struct 7b408000 | grep state
   state = 0x100,
 crash> task_struct 20b1ccf00 | grep state
   state = 0x200

Looking into include/linux/sched.h states are defined as follows:

 #define TASK_RUNNING            0
 ...
 #define TASK_WAKING             256
 #define TASK_PARKED             512

When I issue "help -t" I get the following:

           RUNNING:   0 (0x0)
     INTERRUPTIBLE:   1 (0x1)
   UNINTERRUPTIBLE:   2 (0x2)
           STOPPED:   4 (0x4)
   TRACING_STOPPED:   8 (0x8)
            ZOMBIE:  32 (0x20)
              DEAD:  16 and 32 (0x10 and 0x20)
          WAKEKILL:  64 (0x40)
            WAKING: 128 (0x80)  <- Should be 256?

I have not digged deeper, but at least wanted to report this issue.
Perhaps you see the problem at once.

Michael