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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/tools/testing/selftests/x86/mov_ss_trap.c
..
..
@@ -257,7 +257,8 @@
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 			err(1, "sigaltstack");
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 		sethandler(SIGSEGV, handle_and_longjmp, SA_RESETHAND | SA_ONSTACK);
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 		nr = SYS_getpid;
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-		asm volatile ("mov %[ss], %%ss; SYSENTER" : "+a" (nr)
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+		/* Clear EBP first to make sure we segfault cleanly. */
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+		asm volatile ("xorl %%ebp, %%ebp; mov %[ss], %%ss; SYSENTER" : "+a" (nr)
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 			      : [ss] "m" (ss) : "flags", "rcx"
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 #ifdef __x86_64__
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 				, "r11"