"possible cause of the failure" duplicates many output lines

[RalfJung]

At https://github.com/rust-lang/rust/pull/91342#issuecomment-981225016, the "possible cause of failure" looks rather odd:

error in revision `min`: Error: expected failure status (Some(1)) but received status Some(101).
status: exit status: 101
command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/ui/const-generics/issues/issue-67739.rs" "-Zthreads=1" "--target=x86_64-unknown-linux-gnu" "--cfg" "min" "--error-format" "json" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zemit-future-incompat-report" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/const-generics/issues/issue-67739.min" "-A" "unused" "-Crpath" "-O" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/const-generics/issues/issue-67739.min/auxiliary"
Some tests failed in compiletest suite=ui mode=ui host=x86_64-unknown-linux-gnu target=x86_64-unknown-linux-gnu
------------------------------------------

------------------------------------------
stderr:
stderr:
------------------------------------------
error: internal compiler error: compiler/rustc_traits/src/normalize_erasing_regions.rs:54:32: could not fully normalize `fn() -> usize {std::mem::size_of::<<Self as Trait>::Associated>}`
thread 'rustc' panicked at 'Box<dyn Any>', compiler/rustc_errors/src/lib.rs:1169:9
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

note: the compiler unexpectedly panicked. this is a bug.
note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: rustc 1.59.0-nightly (cccab4dc1 2021-11-28) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z threads=1 -Z ui-testing -Z deduplicate-diagnostics=no -Z emit-future-incompat-report -C codegen-units=1 -C prefer-dynamic -C rpath -C debuginfo=0
query stack during panic:
query stack during panic:
#0 [normalize_generic_arg_after_erasing_regions] normalizing `fn() -> usize {core::mem::size_of::<<Self as Trait>::Associated>}`
#1 [fn_abi_of_instance] computing call ABI of `core::mem::size_of::<<Self as Trait>::Associated>`
error: aborting due to previous error

There are indeed two ICEs in the output, but over on https://github.com/rust-lang/rust/runs/4348491731?check_suite_focus=true they are separated as expected -- not sure if the log-analyzer is duplicating one of the ICEs or interleaving the two of them.