[Bug 675185] [NEW] [Hardy SRU] dash bug causes mysqld_safe to spin at 100% CPU

[Jakob Unterwurzacher]

Public bug reported:

Symptoms are: After mysql server upgrades + restarts the old mysqld_safe keeps running and consumes 100% cpu, strace shows:
wait4(4294967295, 0x7fffb3b3d59c, 0, NULL) = -1 ECHILD (No child ...
wait4(4294967295, 0x7fffb3b3d59c, 0, NULL) = -1 ECHILD (No child ...
wait4(4294967295, 0x7fffb3b3d59c, 0, NULL) = -1 ECHILD (No child ...
For more info see the dupes, particularily bug 105457. Does not happen always, for reliable test case see below.

This is a bug (race condition) in dash, fixed by
http://git.kernel.org/?p=utils/dash/dash.git;a=commit;h=3800d4934391b144fd261a7957aea72ced7d47ea
.

TEST CASE: Script in the commit message (link above). Allows to
reproduce this always, even on Karmic still.

SRU JUSTIFICATION: Obviously safe patch.

PATCH: Attached, run mysqld_safe in bash instead of dash.

REGRESSION POTENTIAL: Minimal. 1) Bash is a superset of dash. 2) Before
dash became the default sh, bash was used, we just revert that change.

NOTES: mysqld_safe will be replaced by an upstart job. But Hardy has
support for 3 more years, justifiying a fix.

** Affects: maria
     Importance: Undecided
         Status: New

** Affects: mysql-dfsg-5.0 (Ubuntu)
     Importance: Undecided
         Status: New

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[Hardy SRU] dash bug causes mysqld_safe to spin at 100% CPU
https://bugs.launchpad.net/bugs/675185
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