Re: Memory corruption in getpwnam, gethostbyname - what component is this?

I have a habit of setting: export GLIBC_TUNABLES=glibc.malloc.check=1:glibc.malloc.perturb=99 which causes glibc to do extra malloc integrity checks. In Rawhide at the moment I'm seeing memory corruption in calls like getpwnam and gethostbyname. Unfortunately I don't have a simple reproducer yet, but two example stack traces are below. I have the latest glibc and systemd. Questions: Has anyone seen this before, and what component should I file the bug against? Rich. Core was generated by `tar -C /var/tmp/supermin36875b.tmpdir/base.d -xf -'. Program terminated with signal SIGSEGV, Segmentation fault. #0 malloc_check_get_size (mem=0x0) at /usr/src/debug/glibc-2.34.9000-15.fc36.x86_64/malloc/malloc-check.c:39 39 magic = (((uintptr_t) p >> 3) ^ ((uintptr_t) p >> 11)) & 0xFF; (gdb) bt #0 malloc_check_get_size (mem=0x0) at /usr/src/debug/glibc-2.34.9000-15.fc36.x86_64/malloc/malloc-check.c:39 #1 malloc_usable_size (mem=0x0) at malloc-debug.c:405 #2 0x00007f0eed847f1a in varlink_read (v=0x55c537e3e1c0) at ../src/shared/varlink.c:508 #3 varlink_process.isra.0 (v=0x55c537e3e1c0) at ../src/shared/varlink.c:959 #4 0x00007f0eed83790a in defer_callback (s=<optimized out>, userdata=<optimized out>) at ../src/shared/varlink.c:1862 #5 0x00007f0eed840e21 in source_dispatch (s=0x55c537e471c0) at ../src/libsystemd/sd-event/sd-event.c:3544 #6 0x00007f0eed834d4c in sd_event_dispatch (e=<optimized out>) at ../src/libsystemd/sd-event/sd-event.c:4078 #7 sd_event_run (timeout=18446744073709551615, e=<optimized out>) at ../src/libsystemd/sd-event/sd-event.c:4139 #8 userdb_process.part.0.lto_priv.0 (iterator=0x55c537e3e410, ret_user_record=0x7ffc22b7dd98, ret_group_record=0x0, ret_user_name=0x0, ret_group_name=0x0) at ../src/shared/userdb.c:594 #9 0x00007f0eed836212 in userdb_process (ret_group_name=0x0, ret_user_name=0x0, ret_group_record=0x0, ret_user_record=0x7ffc22b7dd98, iterator=0x55c537e3e410) at ../src/shared/userdb.c:530 #10 userdb_by_name (name=0x55c537e39109 "mockbuild", flags=9, ret=0x7ffc22b7dd98) at ../src/shared/userdb.c:640 #11 0x00007f0eed81cb2c in userdb_getpwnam (errnop=<synthetic pointer>, buflen=1024, buffer=0x55c537e37370 "debuginfod", pwd=0x7f0eee3ee520 <resbuf>, name=0x55c537e39109 "mockbuild") at ../src/nss-systemd/userdb-glue.c:20 #12 _nss_systemd_getpwnam_r (name=0x55c537e39109 "mockbuild", pwd=0x7f0eee3ee520 <resbuf>, buffer=0x55c537e37370 "debuginfod", buflen=1024, errnop=0x7f0eee143690) at ../src/nss-systemd/nss-systemd.c:330