Thing is, mysqld_safe isn't used anymore since Lucid as upstart has taken over (the file is still there though).
** Description changed: 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 + This is a bug (race condition) in dash, partly fixed by http://git.kernel.org/?p=utils/dash/dash.git;a=commit;h=3800d4934391b144fd261a7957aea72ced7d47ea - . + . This fixes the test case and mysqld_safe, but introduces another + regression: http://eeek.borgchat.net/lists/dash/msg00268.html (patch for + that in the thread) 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. ** Description changed: 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, partly fixed by http://git.kernel.org/?p=utils/dash/dash.git;a=commit;h=3800d4934391b144fd261a7957aea72ced7d47ea . This fixes the test case and mysqld_safe, but introduces another regression: http://eeek.borgchat.net/lists/dash/msg00268.html (patch for that in the thread) 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. + NOTES: mysqld_safe was replaced by an upstart job in Lucid. But Hardy + has support for 3 more years, justifiying a fix. -- [Hardy SRU] dash bug causes mysqld_safe to spin at 100% CPU https://bugs.launchpad.net/bugs/675185 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to mysql-dfsg-5.0 in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
