[   15.470622] DEBUG: *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
[   15.470749] DEBUG: LineageOS Version: '17.1-20210214-NIGHTLY-river'
[   15.470791] DEBUG: Build fingerprint: 'motorola/river/river:9/PPOS29.114-134-4/fe214:user/release-keys'
[   15.470821] DEBUG: Revision: 'PVT'
[   15.470849] DEBUG: ABI: 'arm64'
[   15.470970] DEBUG: Timestamp: 2021-02-09 18:09:34+0000
[   15.471022] DEBUG: pid: 2886, tid: 2886, name: servicemanager  >>> /system/bin/servicemanager <<<
[   15.471051] DEBUG: uid: 1000
[   15.471090] DEBUG: signal 6 (SIGABRT), code -1 (SI_QUEUE), fault addr --------
[   15.471136] DEBUG:     x0  0000000000000000  x1  0000000000000b46  x2  0000000000000006  x3  0000007fc5665fd0
[   15.471177] DEBUG:     x4  feff716466606d60  x5  feff716466606d60  x6  feff716466606d60  x7  7f7f7f7f7f7f7f7f
[   15.471210] DEBUG:     x8  00000000000000f0  x9  3c970476239f0e34  x10 0000000000000001  x11 0000000000000000
[   15.471246] DEBUG:     x12 fffffff0ffffffdf  x13 ffffffffffffffff  x14 0000000000000004  x15 ffffffffffffffff
[   15.471278] DEBUG:     x16 00000079b06f08c0  x17 00000079b06ce3b0  x18 00000079b1b66000  x19 0000000000000b46
[   15.471312] DEBUG:     x20 0000000000000b46  x21 00000000ffffffff  x22 0000000000000001  x23 0000000000000000
[   15.471343] DEBUG:     x24 0000000000000000  x25 0000000000000000  x26 0000000000000000  x27 0000000000000000
[   15.471376] DEBUG:     x28 0000000000000000  x29 0000007fc5666070
[   15.471403] DEBUG:     sp  0000007fc5665fb0  lr  00000079b0681f48  pc  00000079b0681f74
[   15.472975] DEBUG:
[   15.473000] DEBUG: backtrace:
[   15.473085] DEBUG:       #00 pc 0000000000081f74  /apex/com.android.runtime/lib64/bionic/libc.so (abort+160) (BuildId: bf14cf7a62d1f91755beddd4a937354d)
[   15.473135] DEBUG:       #01 pc 00000000000029b4  /system/bin/servicemanager (main+292) (BuildId: a5cc5bfca7b240ddb6ae2f8671a78419)
[   15.473176] DEBUG:       #02 pc 000000000007d780  /apex/com.android.runtime/lib64/bionic/libc.so (__libc_init+108) (BuildId: bf14cf7a62d1f91755beddd4a937354d)

trying to run strace /system/bin/logcat (or one in /usr/libexec) results in:
execve("/system/bin/logcat", ["/system/bin/logcat"], 0xffdeb360 /* 5 vars */) = -1 ENOENT (No such file or directory)
strace: exec: No such file or directory

mount seems fine (/system is /system_root/system, as expected):
/dev/mmcblk0p64 on / type f2fs (rw,noatime,lazytime,background_gc=on,discard,no_heap,user_xattr,inline_xattr,acl,inline_data,inline_dentry,flush_merge,extent_cache,mode=adaptive,active_logs=6,alloc_mode=default,fsync_mode=posix)
/dev/mmcblk0p64 on /data type f2fs (rw,relatime,lazytime,background_gc=on,discard,no_heap,user_xattr,inline_xattr,acl,inline_data,inline_dentry,flush_merge,extent_cache,mode=adaptive,active_logs=6,alloc_mode=default,fsync_mode=posix)
devtmpfs on /dev type devtmpfs (rw,relatime,size=1679256k,nr_inodes=419814,mode=755)
devpts on /dev/pts type devpts (rw,relatime,gid=5,mode=620,ptmxmode=000)
sysfs on /sys type sysfs (rw,relatime)
proc on /proc type proc (rw,relatime)
none on /config type configfs (rw,relatime)
tmpfs on /dev/shm type tmpfs (rw)
tmpfs on /run type tmpfs (rw,nosuid,nodev,mode=755)
tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,mode=755)
cgroup2 on /sys/fs/cgroup/unified type cgroup2 (rw,nosuid,nodev,noexec,relatime)
cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,xattr,name=systemd)
pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime)
bpf on /sys/fs/bpf type bpf (rw,nosuid,nodev,noexec,relatime)
cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpu,cpuacct)
cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory)
cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,perf_event)
cgroup on /sys/fs/cgroup/schedtune type cgroup (rw,nosuid,nodev,noexec,relatime,schedtune)
cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset)
cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer)
cgroup on /sys/fs/cgroup/net_cls type cgroup (rw,nosuid,nodev,noexec,relatime,net_cls)
cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio)
cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices)
debugfs on /sys/kernel/debug type debugfs (rw,relatime)
tmpfs on /tmp type tmpfs (rw,nosuid,nodev)
/dev/mmcblk0p62 on /system_root type ext4 (ro,relatime,discard)
/dev/mmcblk0p62 on /system type ext4 (ro,relatime,discard)
/dev/mmcblk0p60 on /vendor type ext4 (ro,nosuid,nodev,relatime)
/dev/mmcblk0p32 on /mnt/vendor/persist type ext4 (rw,nosuid,nodev,noatime,data=ordered)
/dev/mmcblk0p19 on /vendor/firmware_mnt type ext4 (ro,nosuid,nodev,relatime)
configfs on /sys/kernel/config type configfs (rw,relatime)
fusectl on /sys/fs/fuse/connections type fusectl (rw,relatime)