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see the source for copying conditions.  There > is NO >  warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR > PURPOSE. > > Is this known issue? > > ====== log =============== >   CC      arch/x86/x86_emulate.o > In file included from arch/x86/x86_emulate.c:27: > arch/x86/x86_emulate/x86_emulate.c: In function ‘x86_emulate’: > arch/x86/x86_emulate/x86_emulate.c:70:36: error: writing 1 byte into a > region of size 0 [-Werror=stringop-overflow=] >    70 |     gcc11_wrap(ptr)[0 - PFX_BYTES] = ext < ext_8f08 ? 0xc4 : > 0x8f; \ > arch/x86/x86_emulate/x86_emulate.c:78:9: note: in expansion of macro > ‘copy_VEX’ >    78 |         copy_VEX(ptr, vex); \ >       |         ^~~~~~~~ > arch/x86/x86_emulate/x86_emulate.c:8140:13: note: in expansion of > macro ‘copy_REX_VEX’ >  8140 |             copy_REX_VEX(opc, rex_prefix, vex); >       |             ^~~~~~~~~~~~ > In file included from arch/x86/x86_emulate/x86_emulate.c:11, >                  from arch/x86/x86_emulate.c:27: > arch/x86/x86_emulate/private.h:691:17: note: at offset [0, 4095] into > destination object of size [0, 9223372036854775807] allocated by > ‘map_domain_page’ >   691 |     (stb).ptr = map_domain_page(_mfn(this_cpu(stubs.mfn))) + \ >       |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > arch/x86/x86_emulate/x86_emulate.c:60:21: note: in expansion of macro > ‘get_stub’ >    60 |     uint8_t *buf_ = get_stub(stub); \ >       |                     ^~~~~~~~ > arch/x86/x86_emulate/x86_emulate.c:3354:15: note: in expansion of > macro ‘init_prefixes’ >  3354 |         opc = init_prefixes(stub); >       |               ^~~~~~~~~~~~~ > arch/x86/x86_emulate/private.h:691:17: note: at offset [1, 4096] into > destination object of size [0, 9223372036854775807] allocated by > ‘map_domain_page’ >   691 |     (stb).ptr = map_domain_page(_mfn(this_cpu(stubs.mfn))) + \ >       |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > arch/x86/x86_emulate/x86_emulate.c:94:21: note: in expansion of macro > ‘get_stub’ >    94 |     uint8_t *buf_ = get_stub(stub); \ >       |                     ^~~~~~~~ > arch/x86/x86_emulate/x86_emulate.c:3402:15: note: in expansion of > macro ‘init_evex’ >  3402 |         opc = init_evex(stub); > [...] > Hmm - that looks like more of the GCC 11 bounds bugs, but that's what the gcc11_wrap() visible at the top is supposed to be fixing. Neither of those CONFIG options ought to be relevant. Which Ubuntu is this?  Is it something local, or from one of our CI containers?  Is this on staging, or local? ~Andrew