Re: [PATCH] Staircase scheduler v7.4

[Michael Buesch]

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On Friday 25 June 2004 18:46, you wrote:
> I haven't seen what is in -bk7 so I don't know if there's an issue with
> applying it to that. Anything's possible, though. See if you can
> reproduce it and isolate it to staircase or not and collect some more
> info about what is happening with the task from top, vmstat and
> /proc/$pid/status

I just catched a stalled process:

mb       11000  0.4  0.6  4604 3180 tty2     S    20:32   0:01 /bin/sh ./configure --enable-debug

mb@lfs:/proc/11000> cat status
Name:   configure
State:  S (sleeping)
Burst:  0
Tgid:   11000
Pid:    11000
PPid:   1858
TracerPid:      0
Uid:    1000    1000    1000    1000
Gid:    100     100     100     100
FDSize: 256
Groups: 9 10 100
VmSize:     4604 kB
VmLck:         0 kB
VmRSS:      3180 kB
VmData:     2356 kB
VmStk:       132 kB
VmExe:       572 kB
VmLib:      1444 kB
Threads:        1
SigPnd: 0000000000000000
ShdPnd: 0000000000000000
SigBlk: 0000000000010000
SigIgn: 8000000000000004
SigCgt: 0000000043817efb
CapInh: 0000000000000000
CapPrm: 0000000000000000
CapEff: 0000000000000000

I don't know what the file wchan is good for, but here is
it's output:
mb@lfs:/proc/11000> cat wchan
sys_wait4

Seems it's killable by SIGKILL only.
mb@lfs:/proc/11000> kill 11000
mb@lfs:/proc/11000> kill 11000
mb@lfs:/proc/11000> kill 11000
mb@lfs:/proc/11000> kill -9 11000
mb@lfs:/proc/11000> kill -9 11000
bash: kill: (11000) - No such process

Now it's some kind of reproducible (maybe because
the machine has a higher uptime, now).
A ./configure run sooner or later stalls for sure, now.

mb@lfs:~> vmstat
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in    cs us sy id wa
13  0     92  42520  43696 235384    0    0    33    75 2201  1949 88 12  0  0


- --
Regards Michael Buesch  [ http://www.tuxsoft.de.vu ]


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