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[159.2.239.150]) by smtp.gmail.com with ESMTPSA id af79cd13be357-940f0787d96sm982932985a.28.2026.10.27.07.15.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Oct 2026 07:15:25 -0700 (PDT) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1xLhxU-00000009zYJ-422J; Tue, 27 Oct 2026 11:15:24 -0300 Date: Tue, 27 Oct 2026 11:15:24 -0300 From: Jason Gunthorpe To: Jiri Pirko Cc: Yeoreum Yun , linux-coco@lists.linux.dev, linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, x86@kernel.org, kvm@vger.kernel.org, linux-doc@vger.kernel.org, david.quigley@intel.com, lukas@wunner.de, ksinyuk@kernel.org, rodrigo.vivi@intel.com, cedric.xing@intel.com, sameo@meta.com, drdeeglaze@gmail.com, James.Bottomley@hansenpartnership.com, aik@amd.com, jpiotrowski@nvidia.com, qinkun@google.com, pgonda@google.com, jic23@kernel.org, alistair.francis@wdc.com, ankita@nvidia.com, suzuki.poulose@arm.com, kas@kernel.org, rick.p.edgecombe@intel.com, elena.reshetova@intel.com, dave.hansen@linux.intel.com, sathyanarayanan.kuppuswamy@linux.intel.com, peter.fang@intel.com Subject: Re: [PATCH RFC 02/20] ctlv: Add the UAPI wire format and family API Message-ID: <20261027141524.GF1685504@ziepe.ca> References: <20261015145053.3664509-1-jiri@resnulli.us> <20261015145053.3664509-3-jiri@resnulli.us> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Tue, Oct 27, 2026 at 09:02:14AM +0100, Jiri Pirko wrote: > Mon, Oct 26, 2026 at 07:55:12PM +0100, yeoreum.yun@arm.com wrote: > >[ 3.856919] ctlv_schema_check_attr+0x3dc/0x538 > >[ 3.857105] ctlv_schema_check_indexed_nest+0x788/0x958 > >[ 3.857301] ctlv_schema_validate+0x88/0x180 > >[ 3.857482] ctlv_msg_test_as_deep_as_the_core_allows+0x11c/0x1e8 > >[ 3.857698] kunit_try_run_case+0x64/0x188 > >[ 3.857878] kunit_generic_run_threadfn_adapter+0x30/0x68 > >[ 3.858086] kthread+0x10c/0x140 > >[ 3.858245] ret_from_fork+0x10/0x20 > >[ 3.858398] SMP: stopping secondary CPUs > >[ 3.858630] Kernel Offset: disabled > >[ 3.858720] CPU features: 0x0,00000000,00b0802e,9f190bc3,2affe72f > >[ 3.858872] Memory Limit: none > >[ 3.858976] ---[ end Kernel panic - not syncing: kernel stack overflow ]--- > > > >[...] > > > >I think it might be good to configurable according to architecture > >unless it's not good to reduce the CTLV_MAX_NEST_DEPTH number > >otherwise, increasing stack size when CTLV is enabled seems unresonable... > > Agreed, will lower it down. I think we should be okay with 8 for start. I'm surprised this ran out of stack though with even as few as 32 levels.. Is there accidently something large on the stack? Jason