https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=287229
--- Comment #36 from Gleb Smirnoff <gleb...@freebsd.org> ---
On Sat Jun 21 08:55:37 2025 UTC, lucas.aub...@irisa.fr wrote:
> How can I disable this feature to test if it indeed provokes the observed
> reassembly inconsistencies ?
Option #1: you can recompile kernel with patched sys/netinet/ip_reass.c.
Change the line
V_ipq_hashseed = arc4random();
to something non-random, e.g.:
V_ipq_hashseed = 0;
Option #2: at runtime, before running any of your experiments run kernel
debugger in the write mode:
# kgdb -w
Now it depends if your kernel is compiled with VIMAGE or without. If
compiled without VIMAGE, then it is easy:
(kgbd) set ipq_hashseed = 0
If compiled without VIMAGE, then more complicated:
(kgdb) set *(uint32_t *)(vnet0->vnet_data_base +
(uintptr_t)&vnet_entry_ipq_hashseed) = 0
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