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From: Randy Bush <randy@psg.com>
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Date: Tue, 30 Mar 2004 05:58:04 -0800
To: Jun Kuriyama <kuriyama@imgsrc.co.jp>
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cc: FreeBSD Current <freebsd-current@freebsd.org>
Subject: Re: -current lock up at dump -L with snapshot
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> I'm still tracking down why my box is usually locking up.
> 
> Reference: http://docs.freebsd.org/cgi/mid.cgi?7mznedas57.wl
> 
> I try to simplify how to reproduce this.
> 
> (a) A filesystem without any snapshot, I can take a dump -L.

on -current as of Mar 19 11:01 gmt (and many others)

/sbin/rdump 0Luaf /dev/null /dev/twed0s1a
/sbin/rdump 0Luaf /dev/null /dev/twed0s1d
/sbin/rdump 0Luaf /dev/null /dev/twed0s1e
/sbin/rdump 0Luaf /dev/null /dev/twed0s1f
/sbin/rdump 0Luaf /dev/null /dev/twed0s1g
/sbin/rdump 0Luaf /dev/null /dev/twed0s1h

gets to

# /do-dump
  DUMP: Date of this level 0 dump: Tue Mar 30 13:40:50 2004
  DUMP: Date of last level 0 dump: the epoch
  DUMP: Dumping snapshot of /dev/twed0s1a (/) to /dev/null
  DUMP: mapping (Pass I) [regular files]
  DUMP: mapping (Pass II) [directories]
  DUMP: estimated 31488 tape blocks.
  DUMP: dumping (Pass III) [directories]
  DUMP: dumping (Pass IV) [regular files]
  DUMP: DUMP: 31903 tape blocks on 1 volume
  DUMP: finished in 3 seconds, throughput 10634 KBytes/sec
  DUMP: level 0 dump on Tue Mar 30 13:40:50 2004
  DUMP: Closing /dev/null
  DUMP: DUMP IS DONE
  DUMP: Date of this level 0 dump: Tue Mar 30 13:40:54 2004
  DUMP: Date of last level 0 dump: the epoch
  DUMP: Dumping snapshot of /dev/twed0s1d (/var) to /dev/null
  DUMP: mapping (Pass I) [regular files]
  DUMP: mapping (Pass II) [directories]
  DUMP: estimated 272031 tape blocks.
  DUMP: dumping (Pass III) [directories]
  DUMP: dumping (Pass IV) [regular files]

and hangs.  it sure likes processes

| |   \-+= 47218 root /usr/local/bin/bash /do-dump
| |     \-+- 47228 root /sbin/rdump 0Luaf /dev/null /dev/twed0s1d (rdump)
| |       \-+- 47238 root rdump: /dev/twed0s1d: pass 4: 49.24% done, finished 
| |         |--- 47239 root /sbin/rdump 0Luaf /dev/null /dev/twed0s1d (rdump)
| |         |--- 47240 root /sbin/rdump 0Luaf /dev/null /dev/twed0s1d (rdump)
| |         \--- 47241 root /sbin/rdump 0Luaf /dev/null /dev/twed0s1d (rdump)

none are moving

randy