2018-02-16 worker disk full postmortem

The root filesystem on worker13 is full and the host cannot process Mercurial data anymore.

The culprit seems to be the Mercurial loader itself. / tmp (part of the / filesystem) contains huge files and directories:

12G     sqldict6a19bb
17G     sqldict89fc16
786M    sqldict8f09fa
634M    sqldictc9c674
4.0K    swh.loader.deposit
14M     swh.loader.mercurial.10o7dn_1
4.0M    swh.loader.mercurial.31j86o5f
4.0K    swh.loader.mercurial.35gljinc
24M     swh.loader.mercurial.4p1f_0o0
52K     swh.loader.mercurial.d0y8x43e
50M     swh.loader.mercurial.dzr2_6_e
135M    swh.loader.mercurial.e1_1ejhy
100M    swh.loader.mercurial.g5d8i9y2
15M     swh.loader.mercurial.h_a2csx2
64M     swh.loader.mercurial.jz9z34ow
7.5M    swh.loader.mercurial.lcpqso3x
128M    swh.loader.mercurial.mjp_zken
919M    swh.loader.mercurial.mzlrf1cf
27M     swh.loader.mercurial.o4mn1ran
64M     swh.loader.mercurial.ox9etasm
64M     swh.loader.mercurial.sgyhmxh3
160K    swh.loader.mercurial.tk3ozyv2
35M     swh.loader.mercurial.wd3f3t4i
26M     swh.loader.mercurial.yo2tfris
12K     tmp7w5wd0ar
588K    tmpiary52zt
588K    tmpmiis9pv7

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Migrated from T964 (view on Phabricator)