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Date: Sun, 27 Mar 2022 12:36:07 +0200 From: Paul Menzel <pmenzel@...gen.mpg.de> To: Song Liu <song@...nel.org> Cc: ast@...nel.org, daniel@...earbox.net, andrii@...nel.org, kernel-team@...com, peterz@...radead.org, x86@...nel.org, iii@...ux.ibm.com, Song Liu <songliubraving@...com>, bpf@...r.kernel.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, Rick P Edgecombe <rick.p.edgecombe@...el.com>, regressions@...ts.linux.dev Subject: Re: BUG: Bad page state in process systemd-udevd (was: [PATCH v9 bpf-next 1/9] x86/Kconfig: select HAVE_ARCH_HUGE_VMALLOC with HAVE_ARCH_HUGE_VMAP) Dear Song, Am 26.03.22 um 19:46 schrieb Paul Menzel: > #regzbot introduced: fac54e2bfb5be2b0bbf115fe80d45f59fd773048 > #regzbot title: BUG: Bad page state in process systemd-udevd > Am 04.02.22 um 19:57 schrieb Song Liu: >> From: Song Liu <songliubraving@...com> >> >> This enables module_alloc() to allocate huge page for 2MB+ requests. >> To check the difference of this change, we need enable config >> CONFIG_PTDUMP_DEBUGFS, and call module_alloc(2MB). Before the change, >> /sys/kernel/debug/page_tables/kernel shows pte for this map. With the >> change, /sys/kernel/debug/page_tables/ show pmd for thie map. >> >> Signed-off-by: Song Liu <songliubraving@...com> >> --- >> arch/x86/Kconfig | 1 + >> 1 file changed, 1 insertion(+) >> >> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig >> index 6fddb63271d9..e0e0d00cf103 100644 >> --- a/arch/x86/Kconfig >> +++ b/arch/x86/Kconfig >> @@ -159,6 +159,7 @@ config X86 >> select HAVE_ALIGNED_STRUCT_PAGE if SLUB >> select HAVE_ARCH_AUDITSYSCALL >> select HAVE_ARCH_HUGE_VMAP if X86_64 || X86_PAE >> + select HAVE_ARCH_HUGE_VMALLOC if HAVE_ARCH_HUGE_VMAP >> select HAVE_ARCH_JUMP_LABEL >> select HAVE_ARCH_JUMP_LABEL_RELATIVE >> select HAVE_ARCH_KASAN if X86_64 > > Testing Linus’ current master branch, Linux logs critical messages like > below: > > BUG: Bad page state in process systemd-udevd pfn:102e03 > > I bisected to your commit fac54e2bfb5 (x86/Kconfig: select > HAVE_ARCH_HUGE_VMALLOC with HAVE_ARCH_HUGE_VMAP). Sorry, I forget to mention, that this is a 32-bit (i686) userspace, but a 64-bit Linux kernel, so it might be the same issue as mentioned in commit eed1fcee556f (x86: Disable HAVE_ARCH_HUGE_VMALLOC on 32-bit x86), but didn’t fix the issue for 64-bit Linux kernel and 32-bit userspace. Kind regards, Paul
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