** Patch added: "fix.diff" https://bugs.launchpad.net/bugs/675185/+attachment/1733135/+files/fix.diff
** Description changed: Symptoms are: After mysql server upgrades + restarts the old mysqld_safe keeps running and consumes 100% cpu, strace shows: - 14:18:18.789847 wait4(4294967295, 0x7fffb3b3d59c, 0, NULL) = -1 ECHILD (No child processes) - 14:18:18.789920 wait4(4294967295, 0x7fffb3b3d59c, 0, NULL) = -1 ECHILD (No child processes) - 14:18:18.789992 wait4(4294967295, 0x7fffb3b3d59c, 0, NULL) = -1 ECHILD (No child processes) + wait4(4294967295, 0x7fffb3b3d59c, 0, NULL) = -1 ECHILD (No child processes) + wait4(4294967295, 0x7fffb3b3d59c, 0, NULL) = -1 ECHILD (No child processes) + wait4(4294967295, 0x7fffb3b3d59c, 0, NULL) = -1 ECHILD (No child processes) 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. ** 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 processes) - wait4(4294967295, 0x7fffb3b3d59c, 0, NULL) = -1 ECHILD (No child processes) - wait4(4294967295, 0x7fffb3b3d59c, 0, NULL) = -1 ECHILD (No child processes) + 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. ** Also affects: maria Importance: Undecided Status: New -- [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 Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
