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...have "enough" PAM modules enabled. The segfaults are generally somewhere under pam_authenticate when a PAM module tries to allocate memory. They usually look something like this (there are stack traces with more detail in the linked Debian bug report - this is just for illustration): __printf_buffer (libc.so.6 + 0x6261d) __vasprintf_internal (libc.so.6 + 0x87a6b) ___asprintf_chk (libc.so.6 + 0x11abef) n/a (pam_ecryptfs.so + 0x23d7) pam_sm_authenticate (pam_ecryptfs.so + 0x2ace) n/a (libpam.so.0 + 0x44de) pam_authenticate (libpam.so.0 + 0x3be3) n/a (/home/cjwatson/openssh/sshd-ses...