WARNING: Thread incomplete!

$ b4 am https://lore.kernel.org/all/cover.1680912057.git.jpoimboe@kernel.org/
Analyzing 13 messages in the thread
Checking attestation on all messages, may take a moment...
---
  ✓ [PATCH 1/11] init: Mark [arch_call_]rest_init() __noreturn
    ✓ Signed: DKIM/kernel.org
    + Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> (✓ DKIM/google.com)
  ✓ [PATCH 2/11] init: Mark start_kernel() __noreturn
    ✓ Signed: DKIM/kernel.org
  ✓ [PATCH 3/11] x86/head: Mark *_start_kernel() __noreturn
    ✓ Signed: DKIM/kernel.org
  ✓ [PATCH 4/11] btrfs: Mark btrfs_assertfail() __noreturn
    ✓ Signed: DKIM/kernel.org
  ✓ [PATCH 5/11] arm64/cpu: Mark cpu_park_loop() and friends __noreturn
    ✓ Signed: DKIM/kernel.org
  ✓ [PATCH 6/11] cpu: Mark panic_smp_self_stop() __noreturn
    ✓ Signed: DKIM/kernel.org
  ✓ [PATCH 7/11] cpu: Mark nmi_panic_self_stop() __noreturn
    ✓ Signed: DKIM/kernel.org
  ✓ [PATCH 8/11] x86/cpu: Mark {hlt,resume}_play_dead() __noreturn
    ✓ Signed: DKIM/kernel.org
  ✓ [PATCH 9/11] objtool: Include weak functions in global_noreturns check
    ✓ Signed: DKIM/kernel.org
  ✓ [PATCH 10/11] scsi: message: fusion: Mark mpt_halt_firmware() __noreturn
    ✓ Signed: DKIM/kernel.org
  ✓ [PATCH 11/11] x86/hyperv: Mark hv_ghcb_terminate() as noreturn
    ✓ Signed: DKIM/kernel.org
  ERROR: missing [12/12]!
---
Total patches: 11
---
WARNING: Thread incomplete!
Cover: ./20230407_jpoimboe_sprinkle_more___noreturn.cover
 Link: https://lore.kernel.org/r/cover.1680912057.git.jpoimboe@kernel.org
 Base: applies clean to current tree
       git checkout -b 20230407_jpoimboe_kernel_org HEAD
       git am ./20230407_jpoimboe_sprinkle_more___noreturn.mbx

In particular, I usually use -o - with the above, then pipe that into git am. Since the thread appears incomplete for some reason, this failures with EPIPE.

$ b4 --version
0.10.0

mricon / b4

WARNING: Thread incomplete! #2