From: Willy Tarreau <w@1wt.eu>
Date: Wed, 27 May 2026 16:50:11 +0000 (+0200)
Subject: DEV: dev/gdb: add simple thread dump
X-Git-Tag: v3.4.0~22
X-Git-Url: http://git.ipfire.org/gitweb/index.cgi?a=commitdiff_plain;h=ca5f6cd053cb180b146447b245caed852c394fcc;p=thirdparty%2Fhaproxy.git

DEV: dev/gdb: add simple thread dump

The thread_dump function dumps the list of known threads and a few info
on them (pointer, current run queue, flags etc). This should help more
easily spot a particular one and find stuck ones.

E.g:

  (gdb) thread_dump
  Tid    0: pth=0x7ffff7e797c0 mono=2222322327950732 now_ms=4294947291 fl=0x38 rq=-1 cq=0 current=(nil)
  Tid    1: pth=0x7ffff78d8640 mono=2222322327928085 now_ms=4294947291 fl=0x38 rq=-1 cq=0 current=(nil)
  Tid    2: pth=0x7ffff6b7e640 mono=2222322327927150 now_ms=4294947291 fl=0x38 rq=-1 cq=0 current=(nil)
  Tid    3: pth=0x7ffff637d640 mono=2222322327924878 now_ms=4294947291 fl=0x38 rq=-1 cq=0 current=(nil)
  Tid    4: pth=0x7ffff5b7c640 mono=2222322327925676 now_ms=4294947291 fl=0x38 rq=-1 cq=0 current=(nil)
  Tid    5: pth=0x7ffff537b640 mono=2222322327929524 now_ms=4294947291 fl=0x38 rq=-1 cq=0 current=(nil)
  Tid    6: pth=0x7ffff4b7a640 mono=2222322327926817 now_ms=4294947291 fl=0x38 rq=-1 cq=0 current=(nil)
  Tid    7: pth=0x7fffdffff640 mono=2222322327947960 now_ms=4294947291 fl=0x38 rq=-1 cq=0 current=(nil)
---

diff --git a/dev/gdb/thread.gdb b/dev/gdb/thread.gdb
new file mode 100644
index 000000000..41b5712f0
--- /dev/null
+++ b/dev/gdb/thread.gdb
@@ -0,0 +1,10 @@
+# list info about current threads (ptr, now_ms, queue, current)
+define thread_dump
+  set $t = 0
+  while $t < $g.nbthread
+    set $i = $ti[$t].pth_id
+    set $h = $tc[$t].current
+    printf "Tid %4d: pth=%p mono=%llu now_ms=%u fl=0x%02x rq=%d cq=%d current=%p\n", $t, $i, $tc[$t].curr_mono_time, (unsigned)(($tc[$t].curr_mono_time + now_offset)/1000000), $tc[$t].flags, $tc[$t].current_queue, $tc[$t].rq_total, $h
+    set $t = $t + 1
+  end
+end