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I checked the logs, and the only clue I have to this mystery are from /var/log/syslog:

Nov  8 00:53:15 snowflake kernel: [19782731.564416] tor invoked oom-killer: gfp_mask=0x100cca(GFP_HIGHUSER_MOVABLE), order=0, oom_score_
adj=0
Nov  8 00:53:15 snowflake kernel: [19782731.564494] CPU: 0 PID: 10912 Comm: tor Not tainted 5.4.20 #8
Nov  8 00:53:15 snowflake kernel: [19782731.564536] Call Trace:
Nov  8 00:53:15 snowflake kernel: [19782731.564571]  dump_stack+0x66/0x8b
Nov  8 00:53:15 snowflake kernel: [19782731.564603]  dump_header+0x42/0x200
Nov  8 00:53:15 snowflake kernel: [19782731.564635]  oom_kill_process+0xe9/0x110
Nov  8 00:53:15 snowflake kernel: [19782731.564668]  out_of_memory+0xfa/0x4a0
Nov  8 00:53:15 snowflake kernel: [19782731.564701]  __alloc_pages_slowpath+0x91c/0xca0
Nov  8 00:53:15 snowflake kernel: [19782731.564740]  __alloc_pages_nodemask+0x249/0x280
Nov  8 00:53:15 snowflake kernel: [19782731.564777]  pagecache_get_page+0xbb/0x220
Nov  8 00:53:15 snowflake kernel: [19782731.564810]  filemap_fault+0x56e/0x860
Nov  8 00:53:15 snowflake kernel: [19782731.564842]  ? page_add_file_rmap+0x135/0x170
Nov  8 00:53:15 snowflake kernel: [19782731.564892]  ? alloc_set_pte+0x17c/0x5e0
Nov  8 00:53:15 snowflake kernel: [19782731.564929]  ? xas_load+0x9/0x80
Nov  8 00:53:15 snowflake kernel: [19782731.564974]  ? xas_find+0x192/0x1d0
Nov  8 00:53:15 snowflake kernel: [19782731.565005]  ? filemap_map_pages+0x16f/0x360
Nov  8 00:53:15 snowflake kernel: [19782731.565062]  __xfs_filemap_fault.constprop.24+0x37/0xc0 [xfs]
Nov  8 00:53:15 snowflake kernel: [19782731.565104]  __do_fault+0x4a/0x8e
Nov  8 00:53:15 snowflake kernel: [19782731.565135]  __handle_mm_fault+0xbc2/0x1110
Nov  8 00:53:15 snowflake kernel: [19782731.565169]  handle_mm_fault+0xe7/0x1d0
Nov  8 00:53:15 snowflake kernel: [19782731.566305]  __do_page_fault+0x1f5/0x4c0
Nov  8 00:53:15 snowflake kernel: [19782731.567444]  page_fault+0x34/0x40
Nov  8 00:53:15 snowflake kernel: [19782731.568571] RIP: 0033:0x55b72cdd7bd0
Nov  8 00:53:15 snowflake kernel: [19782731.569707] Code: Bad RIP value.
Nov  8 00:53:15 snowflake kernel: [19782731.570796] RSP: 002b:00007ffc9a8864e8 EFLAGS: 00010246
Nov  8 00:53:15 snowflake kernel: [19782731.571875] RAX: 0000000000000004 RBX: 000055b7343027c0 RCX: 0000000000000000
Nov  8 00:53:15 snowflake kernel: [19782731.573130] RDX: 0000000000000001 RSI: 000000005fa7417a RDI: 000055b7343027c0
Nov  8 00:53:15 snowflake kernel: [19782731.574265] RBP: 0000000000000000 R08: 000000005fa7417a R09: 000000005fa805c8
Nov  8 00:53:15 snowflake kernel: [19782731.575437] R10: 0000000000000006 R11: 0000000000000000 R12: 0000000000000218
Nov  8 00:53:15 snowflake kernel: [19782731.576585] R13: 000000005fa7417a R14: 0000000000000000 R15: 000055b7343027c0
Nov  8 00:53:15 snowflake kernel: [19782731.577918] Mem-Info:
Nov  8 00:53:15 snowflake kernel: [19782731.579136] active_anon:366133 inactive_anon:16451 isolated_anon:0
Nov  8 00:53:15 snowflake kernel: [19782731.579136]  active_file:16 inactive_file:37 isolated_file:0
Nov  8 00:53:15 snowflake kernel: [19782731.579136]  unevictable:0 dirty:0 writeback:0 unstable:0
Nov  8 00:53:15 snowflake kernel: [19782731.579136]  slab_reclaimable:1604 slab_unreclaimable:10856
Nov  8 00:53:15 snowflake kernel: [19782731.579136]  mapped:485 shmem:18773 pagetables:1112 bounce:0
Nov  8 00:53:15 snowflake kernel: [19782731.579136]  free:13180 free_pcp:534 free_cma:0

This machine should only run proxies and the bridge, it's possible there's a memory leak somewhere.