Repeated segfault in udev_rule_line_free

[PyroDesu]

Ubuntu version: 20.04 focal (Distro: Linux Mint 20.1 Ulyssa)

systemd version: 245.4-4ubuntu3.7

What happened: systemd-udevd underwent repeated segfaults and coredumps for unknown reasons. Loop stopped by forcing restart of udevd. Coredump information:

           PID: 381 (systemd-udevd)
           UID: 0 (root)
           GID: 0 (root)
        Signal: 11 (SEGV)
     Timestamp: Wed 2021-07-14 00:12:29 EDT (9h ago)
  Command Line: /lib/systemd/systemd-udevd
    Executable: /lib/systemd/systemd-udevd
 Control Group: /system.slice/systemd-udevd.service
          Unit: systemd-udevd.service
         Slice: system.slice
       Boot ID: abaa4a5b0c6641cda2c58d7c307cfc38
    Machine ID: b76cc7b1bbdc489e93909d2043031de8
      Hostname: Ampere-Limux
       Storage: /var/lib/systemd/coredump/core.systemd-udevd.0.abaa4a5b0c6641cda2c58d7c307cfc38.381.1626235949000000000000.lz4
       Message: Process 381 (systemd-udevd) of user 0 dumped core.

                Stack trace of thread 381:
#0 0x00005635cdf522eb in udev_rule_line_free (rule_line=0x5635cec9db20) at ../src/udev/udev-rules.c:270
#1 0x00005635cdf53d0c in udev_rule_file_free (rule_file=0x5635cecb2760) at ../src/udev/udev-rules.c:289
#2 udev_rules_free (rules=0x5635cea0ad10) at ../src/udev/udev-rules.c:302
#3 0x00005635cdf60875 in manager_free (manager=manager@entry=0x5635ce9fde60) at ../src/udev/udevd.c:306
#4 0x00005635cdf63e34 in manager_freep (p=<synthetic pointer>) at ../src/udev/udevd.c:314
#5 run (argc=<optimized out>, argv=<optimized out>) at ../src/udev/udevd.c:1703
#6 0x00005635cdf0721a in main (argc=<optimized out>, argv=<optimized out>) at ../src/udev/udevd.c:1817

[Nick Rosbrook (enr0n)]

Sorry this was not looked at sooner. Please re-open if still an issue.