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SubjectInfamous 'root busy' on shutdown <=> unkillable processes on wait IO
Hello again,

I just got one of those unkillable process. This time it is
'ksnapshot' which hung abnormally. Seeing its state, I'm *sure*
it will make the unmount of '/' impossible if I need to shutdown.


As Andreas Bombe suggested, I send some informations about the processes,
and if someone needs other informations, I'll try keeping the system
running so it can be possible to produce other useful states I'm not
aware of.

This system runs a kernel 2.2.9 with glibc2.1.1.

Thanks a lot for your time,

Francois Desarmenien

Here is the output of 'cat /proc/12178/status' :
-------------------------------------------------------------------------------
Name: ksnapshot
State: D (disk sleep)
Pid: 12178
PPid: 1
Uid: 0 0 0 0
Gid: 0 0 0 0
Groups: 0 1 2 3 4 6 10 511
VmSize: 6112 kB
VmLck: 0 kB
VmRSS: 3828 kB
VmData: 1048 kB
VmStk: 20 kB
VmExe: 40 kB
VmLib: 4700 kB
SigPnd: 0000000000004101
SigBlk: 0000000000000000
SigIgn: 0000000000000000
SigCgt: 0000000000000000
CapInh: 00000000fffffeff
CapPrm: 00000000fffffeff
CapEff: 00000000fffffeff
-------------------------------------------------------------------------------

And here is the output of 'ps axwl':
--------------------------------------------------------------------------------
F UID PID PPID PRI NI VSZ RSS WCHAN STAT TTY TIME COMMAND
100 0 1 0 0 0 1144 68 do_sel S ? 0:04 init
040 0 2 1 0 0 0 0 bdflus SW ? 0:01 [kflushd]
040 0 3 1 0 0 0 0 kpiod SW ? 0:00 [kpiod]
040 0 4 1 0 0 0 0 kswapd SW ? 0:01 [kswapd]
140 1 255 1 0 0 1140 0 do_sel SW ? 0:00 [portmap]
040 0 301 1 0 0 1340 216 do_sel S ? 0:00 syslogd
140 0 311 1 0 0 1440 168 do_sys S ? 0:00 klogd
040 2 324 1 0 0 1168 112 nanosl S ? 0:00 /usr/sbin/atd
040 0 337 1 0 0 1364 116 nanosl S ? 0:00 crond
140 0 350 1 0 0 1304 72 do_sel S ? 0:00 inetd
140 2 363 1 0 0 1644 0 do_sel SW ? 0:00 [lpd]
140 0 400 1 0 0 1984 300 do_sel S ? 0:00 sendmail: accepting connections on port 25
140 0 414 1 0 0 1188 68 read_a S ? 0:00 gpm -t ps/2
140 0 427 1 0 0 3916 48 do_sel S ? 0:00 httpd
040 0 485 1 0 0 1112 0 pause SW ? 0:00 [vmnet-bridge]
040 100 508 1 0 0 2724 1056 do_sel S ? 0:10 xfs
140 0 521 1 0 0 2136 0 do_sel SW ? 0:00 [smbd]
140 0 531 1 0 0 1764 372 do_sel S ? 0:05 nmbd -D
000 510 577 1 0 0 20384 528 semop S ? 0:00 ora_pmon_A
000 510 579 1 0 0 20220 856 semop S ? 0:00 [oracle]
000 510 581 1 0 0 20164 516 semop S ? 0:00 ora_lgwr_A
000 510 583 1 0 0 20164 420 semop S ? 0:00 [oracle]
000 510 585 1 0 0 20140 3300 semop S ? 0:01 ora_smon_A
000 510 587 1 0 0 20164 3516 semop S ? 0:00 ora_reco_A
040 0 596 1 0 0 1484 0 do_sel SW ? 0:00 [vmnet-dhcpd]
000 510 599 1 0 0 4984 916 do_sel S ? 0:00 /disk0/app/oracle/product/8.0.5/bin/tnslsnr LISTENER -inherit
040 0 601 1 0 0 3452 596 wait_f S ? 0:00 perl /u/usys/bin/srvusrd
100 0 605 1 0 0 1120 0 read_c SW tty2 0:00 [mingetty]
100 0 606 1 0 0 1120 0 read_c SW tty3 0:00 [mingetty]
100 0 607 1 0 0 1120 0 read_c SW tty4 0:00 [mingetty]
100 0 608 1 0 0 1120 0 read_c SW tty5 0:00 [mingetty]
100 0 609 1 0 0 1120 0 read_c SW tty6 0:00 [mingetty]
100 0 2791 1 0 0 2220 0 wait4 SW tty1 0:00 [login]
140 99 3415 427 0 0 3980 0 wait_f SW ? 0:00 [httpd]
140 99 3416 427 0 0 3980 0 posix_ SW ? 0:00 [httpd]
140 99 3417 427 0 0 3980 0 posix_ SW ? 0:00 [httpd]
140 99 3418 427 0 0 3980 0 posix_ SW ? 0:00 [httpd]
140 99 3419 427 0 0 3980 0 posix_ SW ? 0:00 [httpd]
140 99 3420 427 0 0 3980 0 posix_ SW ? 0:00 [httpd]
140 99 3421 427 0 0 3980 0 posix_ SW ? 0:00 [httpd]
140 99 3422 427 0 0 3980 0 posix_ SW ? 0:00 [httpd]
140 99 3423 427 0 0 3980 0 posix_ SW ? 0:00 [httpd]
140 99 3424 427 0 0 3980 0 posix_ SW ? 0:00 [httpd]
100 0 9016 2791 9 0 2132 808 wait4 S tty1 0:00 -bash
200 0 12178 1 0 0 6112 3828 down_f D tty1 0:00 ksnapshot
100 0 12207 9016 10 0 2532 856 - R tty1 0:00 ps axwl
-------------------------------------------------------------------------------

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