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coredump: capture crashing thread ID and name

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Add %I (TID in initial PID namespace) to the core_pattern, so the
kernel passes the crashing thread's TID to systemd-coredump. Use it
to read the thread's comm name from /proc/<tid>/comm and log both as
new journal fields:

  COREDUMP_TID=       — TID of the crashing thread
  COREDUMP_THREAD_NAME= — comm name of the crashing thread

These fields are also stored as xattrs on external coredump files
(user.coredump.tid, user.coredump.thread_name) and displayed by
coredumpctl info alongside the PID line.

For single-threaded processes the TID equals the PID and thread_name
equals comm; for multi-threaded programs with named worker threads
(pthread_setname_np / PR_SET_NAME) this identifies which thread
crashed without needing to open the coredump file itself.

The new fields are optional in the socket forwarding path, so older
systemd-coredump senders are handled gracefully.

Co-developed-by: Claude <claude@anthropic.com>
This commit is contained in:
noxiouz
2026-03-18 10:27:27 +00:00
committed by Luca Boccassi
parent 8a2c423870
commit 4c7af7d9d1
6 changed files with 49 additions and 2 deletions
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test/units/TEST-87-AUX-UTILS-VM.coredump.sh
+5
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@@ -150,6 +150,11 @@ coredumpctl info foo bar baz "${CORE_TEST_BIN##*/}"
coredumpctl info COREDUMP_EXE="$CORE_TEST_BIN"
coredumpctl info COREDUMP_EXE=aaaaa COREDUMP_EXE= COREDUMP_EXE="$CORE_TEST_BIN"
# Check that COREDUMP_TID= is present and displayed by coredumpctl info
coredumpctl info "$CORE_TEST_BIN" | grep "TID:" >/dev/null
# Check the field is queryable in the journal
coredumpctl -F COREDUMP_TID
coredumpctl debug --debugger=/bin/true "$CORE_TEST_BIN"
SYSTEMD_DEBUGGER=/bin/true coredumpctl debug "$CORE_TEST_BIN"
coredumpctl debug --debugger=/bin/true --debugger-arguments="-this --does --not 'do anything' -a -t --all" "${CORE_TEST_BIN##*/}"