What were you trying to do that didn't work?

Excess delay (3-5 minutes) between confirming a boot entry and actual kernel start.

Please provide the package NVR for which bug is seen:

grub2-efi-x64-2.06-82.el9.x86_64
grub2-efi-x64-2.06-125.el10.x86_64

Dell PowerEdge R660, BIOS rev. 2.3.4

How reproducible:

always

Steps to reproduce

1. configure boot from NVMe over TCP
2. install CentOS Stream 9.5
3. observe grub menu showing up
4. select the default (regular) boot item

Expected results

kernel starts booting within short time (e.g. 10 seconds)

Actual results

grub menu disappears, I see cursor blinking on an empty console and it takes 3-5 minutes before kernel starts booting. No error displayed. Actual kernel run is fast, it's fully initialized in ~ 3 seconds.

When starting the kernel image (stub) from UEFI Shell, it boots instantly.

Suspecting slow file read. Secure Boot is disabled.

Nothing special in EFI Boot Manager:

Boot0001* CentOS Stream	HD(1,GPT,6cc801d0-8cbf-42c9-9956-36dae3c2f303,0x100,0x25800)/File(\EFI\centos\shimx64.efi)

My kernel stub boot entry looks as follows:

Boot0000* tbzatek c9s direct boot	HD(1,GPT,6cc801d0-8cbf-42c9-9956-36dae3c2f303,0x100,0x25800)/File(\EFI\tbzatek\vmlinuz-5.14.0-493.el9.x86_64.efi)i.n.i.t.r.d.=./.E.F.I./.t.b.z.a.t.e.k./.i.n.i.t.r.a.m.f.s.-.5...1.4...0.-.4.9.3...e.l.9...x.8.6._.6.4...i.m.g. .r.o.o.t.=./.d.e.v./.m.a.p.p.e.r./.c.s._.r.h.e.l.-.-.s.t.o.r.a.g.e.-.-.1.0.8.0.0.-.r.o.o.t. .r.o. .c.r.a.s.h.k.e.r.n.e.l.=.1.G.-.4.G.:.1.9.2.M.,.4.G.-.6.4.G.:.2.5.6.M.,.6.4.G.-.:.5.1.2.M. .r.e.s.u.m.e.=./.d.e.v./.m.a.p.p.e.r./.c.s._.r.h.e.l.-.-.s.t.o.r.a.g.e.-.-.1.0.8.0.0.-.s.w.a.p. .r.d...l.v.m...l.v.=.c.s._.r.h.e.l.-.s.t.o.r.a.g.e.-.1.0.8.0.0./.r.o.o.t. .r.d...l.v.m...l.v.=.c.s._.r.h.e.l.-.s.t.o.r.a.g.e.-.1.0.8.0.0./.h.o.m.e. .r.d...l.v.m...l.v.=.c.s._.r.h.e.l.-.s.t.o.r.a.g.e.-.1.0.8.0.0./.s.w.a.p.