[llvm-bugs] [Bug 46452] New: disable_coredump=1 does not disable coredump on systemd

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46452

            Bug ID: 46452
           Summary: disable_coredump=1 does not disable coredump on
                    systemd
           Product: compiler-rt
           Version: 10.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: asan
          Assignee: unassignedbugs at nondot.org
          Reporter: ed at catmur.co.uk
                CC: llvm-bugs at lists.llvm.org

(related: #44214)

If /proc/sys/kernel/core_pattern is a pipe (e.g. '|/usr/bin/coredump
<args...>') then setting RLIMIT_CORE to 0 does not actually disable coredumps;
they are still generated and passed to the coredump helper, which will then
send it to /dev/null (if written to respect RLIMIT_CORE).

Per https://github.com/systemd/systemd/issues/2643#issuecomment-234021824 the
solution is to set RLIMIT_CORE=1 (!) which will fully disable core dumping (no
core is generated, the coredump helper is not invoked, and si_code is
CLD_KILLED not CLD_DUMPED).

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