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Sun, 27 Apr 2025 08:07:39 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface Precedence: bulk X-Mailing-List: oe-lkp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ThreadId: T98d234c297665c71 Date: Sun, 27 Apr 2025 14:07:09 +0200 From: "Arnd Bergmann" To: "kernel test robot" Cc: oe-lkp@lists.linux.dev, "kernel test robot" , linux-kernel@vger.kernel.org, "Ingo Molnar" , "Linus Torvalds" , "John Stultz" , "Thomas Gleixner" , "Stephen Boyd" , "Borislav Petkov" , "Dave Hansen" , x86@kernel.org, "H. Peter Anvin" Message-Id: <963683ea-eaba-4430-bd8a-1b11affe104a@app.fastmail.com> In-Reply-To: References: <202504211553.3ba9400-lkp@intel.com> <59198081-15e2-4b02-934f-c34dd1a0ac93@app.fastmail.com> Subject: Re: [linus:master] [x86/cpu] f388f60ca9: BUG:soft_lockup-CPU##stuck_for#s![swapper:#] Content-Type: text/plain Content-Transfer-Encoding: 7bit On Sun, Apr 27, 2025, at 07:48, Oliver Sang wrote: > On Thu, Apr 24, 2025 at 09:59:38AM +0200, Arnd Bergmann wrote: >> >> Thanks for confirming. So a 486-targeted kernel still passes >> your tests on modern hardware if we force TSC and CX8 to >> be enabled, but the boot fails if the options are turned >> off in Kconfig (though available in emulated hardware). >> >> To be completely sure, you could re-run the same test with >> just one of these enabled, but I'm rather sure that the TSC >> is the root cause. > > just FYI. we rerun the tests. if only enable X86_TSC, the config diff is ... > the various issues still exists: > > if only enable X86_CMPXCHG64: ... > various issues gone: Interesting, so cx8 was indeed a problem. I would still assume that TSC caused the boot panic I cited, but it looks like CX8 caused all the other symptoms. At the minimum this strengthens the case for the consensus of dropping support for all pre-586 cores. Thanks a lot for confirming! Arnd