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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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sysctl.d/50-coredump.conf.in
+1 -1
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@@ -13,7 +13,7 @@
# the core dump.
#
# See systemd-coredump(8) and core(5).
kernel.core_pattern=|{{LIBEXECDIR}}/systemd-coredump %P %u %g %s %t %c %h %d %F
kernel.core_pattern=|{{LIBEXECDIR}}/systemd-coredump %P %u %g %s %t %c %h %d %F %I
# Allow 16 coredumps to be dispatched in parallel by the kernel.
# We collect metadata from /proc/%P/, and thus need to make sure the crashed