CI assertion failure tt->isdispatchtuple || tt->hasfreetypevars

[stevengj]

In #52723 I observed the following CI failure on x86_64-linux-gnuassertrr during test/gc.jl

Distributed                                       (1) |   767.79 |   0.00 |  0.0 |      31.94 |   519.91
gc                                                (1) |        started at 2024-01-10T16:01:10.812 on pid 538
julia: /cache/build/tester-amdci4-12/julialang/julia-master/src/gf.c:1458: jl_mt_assoc_by_type: Assertion `tt->isdispatchtuple || tt->hasfreetypevars' failed.

The complete error output (from here) is:

Distributed                                       (1) |        started at 2024-01-10T15:48:23.019 on pid 538
      From worker 28:
      From worker 28:	[7805] signal 15: Terminated
      From worker 28:	in expression starting at none:0
      From worker 28:	unknown function (ip: 0x70000002)
      From worker 28:	unknown function (ip: 0x7ffb919942c3)
      From worker 28:	traced_raw_syscall at /workspace/srcdir/rr/src/preload/syscallbuf.c:338
      From worker 28:	syscall_hook at /workspace/srcdir/rr/src/preload/syscallbuf.c:3942 [inlined]
      From worker 28:	syscall_hook at /workspace/srcdir/rr/src/preload/syscallbuf.c:3926
      From worker 28:	unknown function (ip: 0x7ffb9198e312)
      From worker 28:	unknown function (ip: 0x7ffb9198e37c)
      From worker 28:	unknown function (ip: 0x7ffb9198e398)
      From worker 28:	epoll_wait at /lib/x86_64-linux-gnu/libc.so.6 (unknown line)
      From worker 28:	uv__io_poll at /workspace/srcdir/libuv/src/unix/epoll.c:236
      From worker 28:	uv_run at /workspace/srcdir/libuv/src/unix/core.c:400
      From worker 28:	ijl_task_get_next at /cache/build/tester-amdci4-12/julialang/julia-master/src/scheduler.c:514
      From worker 28:	poptask at ./task.jl:998
      From worker 28:	wait at ./task.jl:1007
      From worker 28:	task_done_hook at ./task.jl:687
      From worker 28:	jfptr_task_done_hook_59670.1 at /cache/build/tester-amdci4-10/julialang/julia-master/julia-91e465d9c3/lib/julia/sys.so (unknown line)
      From worker 28:	_jl_invoke at /cache/build/tester-amdci4-12/julialang/julia-master/src/gf.c:2921 [inlined]
      From worker 28:	ijl_apply_generic at /cache/build/tester-amdci4-12/julialang/julia-master/src/gf.c:3098
      From worker 28:	jl_apply at /cache/build/tester-amdci4-12/julialang/julia-master/src/julia.h:2152 [inlined]
      From worker 28:	jl_finish_task at /cache/build/tester-amdci4-12/julialang/julia-master/src/task.c:327
      From worker 28:	start_task at /cache/build/tester-amdci4-12/julialang/julia-master/src/task.c:1317
      From worker 28:	unknown function (ip: (nil))
      From worker 28:	Allocations: 5059457 (Pool: 5059280; Big: 177); GC: 5
┌ Warning: rmprocs: process 1 not removed
└ @ Distributed /cache/build/tester-amdci4-10/julialang/julia-master/julia-91e465d9c3/share/julia/stdlib/v1.11/Distributed/src/cluster.jl:1049
Distributed                                       (1) |   767.79 |   0.00 |  0.0 |      31.94 |   519.91
gc                                                (1) |        started at 2024-01-10T16:01:10.812 on pid 538
julia: /cache/build/tester-amdci4-12/julialang/julia-master/src/gf.c:1458: jl_mt_assoc_by_type: Assertion `tt->isdispatchtuple || tt->hasfreetypevars' failed.
[8510] signal 6 (-6): Aborted
in expression starting at /cache/build/tester-amdci4-10/julialang/julia-master/julia-91e465d9c3/share/julia/test/gc/binarytree.jl:53
gsignal at /lib/x86_64-linux-gnu/libc.so.6 (unknown line)
abort at /lib/x86_64-linux-gnu/libc.so.6 (unknown line)
unknown function (ip: 0x7fdbb373540e)
__assert_fail at /lib/x86_64-linux-gnu/libc.so.6 (unknown line)
jl_mt_assoc_by_type at /cache/build/tester-amdci4-12/julialang/julia-master/src/gf.c:1458
jl_lookup_generic_ at /cache/build/tester-amdci4-12/julialang/julia-master/src/gf.c:3071 [inlined]
ijl_apply_generic at /cache/build/tester-amdci4-12/julialang/julia-master/src/gf.c:3094
check at /cache/build/tester-amdci4-10/julialang/julia-master/julia-91e465d9c3/share/julia/test/gc/binarytree.jl:21
check at /cache/build/tester-amdci4-10/julialang/julia-master/julia-91e465d9c3/share/julia/test/gc/binarytree.jl:21
check at /cache/build/tester-amdci4-10/julialang/julia-master/julia-91e465d9c3/share/julia/test/gc/binarytree.jl:21
check at /cache/build/tester-amdci4-10/julialang/julia-master/julia-91e465d9c3/share/julia/test/gc/binarytree.jl:21
check at /cache/build/tester-amdci4-10/julialang/julia-master/julia-91e465d9c3/share/julia/test/gc/binarytree.jl:21
check at /cache/build/tester-amdci4-10/julialang/julia-master/julia-91e465d9c3/share/julia/test/gc/binarytree.jl:21
check at /cache/build/tester-amdci4-10/julialang/julia-master/julia-91e465d9c3/share/julia/test/gc/binarytree.jl:21
macro expansion at /cache/build/tester-amdci4-10/julialang/julia-master/julia-91e465d9c3/share/julia/test/gc/binarytree.jl:35 [inlined]
#5#threadsfor_fun#1 at ./threadingconstructs.jl:214
#5#threadsfor_fun at ./threadingconstructs.jl:181 [inlined]
#1 at ./threadingconstructs.jl:153
unknown function (ip: 0x7fdb84028c52)
_jl_invoke at /cache/build/tester-amdci4-12/julialang/julia-master/src/gf.c:2921 [inlined]
ijl_apply_generic at /cache/build/tester-amdci4-12/julialang/julia-master/src/gf.c:3098
jl_apply at /cache/build/tester-amdci4-12/julialang/julia-master/src/julia.h:2152 [inlined]
start_task at /cache/build/tester-amdci4-12/julialang/julia-master/src/task.c:1306
Allocations: 3872487 (Pool: 3872460; Big: 27); GC: 4
gc                                                (1) |         failed at 2024-01-10T16:02:16.086
Error During Test at /cache/build/tester-amdci4-10/julialang/julia-master/julia-91e465d9c3/share/julia/test/gc.jl:12
  Test threw exception