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[185.219.167.24]) by smtp.gmail.com with ESMTPSA id t14-20020a170906948e00b0098d2f703408sm7724415ejx.118.2023.06.30.01.43.03 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 30 Jun 2023 01:43:04 -0700 (PDT) Message-ID: Date: Fri, 30 Jun 2023 10:43:02 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.12.0 Subject: Re: [PATCH v4 29/33] x86/mm: try VMA lock-based page fault handling first Content-Language: en-US From: Jiri Slaby To: Suren Baghdasaryan Cc: akpm@linux-foundation.org, michel@lespinasse.org, jglisse@google.com, mhocko@suse.com, vbabka@suse.cz, hannes@cmpxchg.org, mgorman@techsingularity.net, dave@stgolabs.net, willy@infradead.org, liam.howlett@oracle.com, peterz@infradead.org, ldufour@linux.ibm.com, paulmck@kernel.org, mingo@redhat.com, will@kernel.org, luto@kernel.org, songliubraving@fb.com, peterx@redhat.com, david@redhat.com, dhowells@redhat.com, hughd@google.com, bigeasy@linutronix.de, kent.overstreet@linux.dev, punit.agrawal@bytedance.com, lstoakes@gmail.com, peterjung1337@gmail.com, rientjes@google.com, chriscli@google.com, axelrasmussen@google.com, joelaf@google.com, minchan@google.com, rppt@kernel.org, jannh@google.com, shakeelb@google.com, tatashin@google.com, edumazet@google.com, gthelen@google.com, gurua@google.com, arjunroy@google.com, soheil@google.com, leewalsh@google.com, posk@google.com, michalechner92@googlemail.com, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, x86@kernel.org, linux-kernel@vger.kernel.org, kernel-team@android.com References: <20230227173632.3292573-1-surenb@google.com> <20230227173632.3292573-30-surenb@google.com> <9a8d788c-b8ba-1b8a-fd79-0e25b1b60bed@kernel.org> In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 30. 06. 23, 10:28, Jiri Slaby wrote: > > 2348 > clone3({flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, child_tid=0x7fcaa5882990, parent_tid=0x7fcaa5882990, exit_signal=0, stack=0x7fcaa5082000, stack_size=0x7ffe00, tls=0x7fcaa58826c0} => {parent_tid=[2351]}, 88) = 2351 > > 2350  <... clone3 resumed> => {parent_tid=[2372]}, 88) = 2372 > > 2351  <... clone3 resumed> => {parent_tid=[2354]}, 88) = 2354 > > 2351  <... clone3 resumed> => {parent_tid=[2357]}, 88) = 2357 > > 2354  <... clone3 resumed> => {parent_tid=[2355]}, 88) = 2355 > > 2355  <... clone3 resumed> => {parent_tid=[2370]}, 88) = 2370 > > 2370  mmap(NULL, 262144, PROT_READ|PROT_WRITE, > MAP_PRIVATE|MAP_ANONYMOUS, -1, 0 > > 2370  <... mmap resumed>)               = 0x7fca68249000 > > 2372  <... clone3 resumed> => {parent_tid=[2384]}, 88) = 2384 > > 2384  <... clone3 resumed> => {parent_tid=[2388]}, 88) = 2388 > > 2388  <... clone3 resumed> => {parent_tid=[2392]}, 88) = 2392 > > 2392  <... clone3 resumed> => {parent_tid=[2395]}, 88) = 2395 > > 2395  write(2, "runtime: marked free object in s"..., 36 ...> > > I.e. IIUC, all are threads (CLONE_VM) and thread 2370 mapped ANON > 0x7fca68249000 - 0x7fca6827ffff and go in thread 2395 thinks for some > reason 0x7fca6824bec8 in that region is "bad". As I was noticed, this might be as well be a fail of the go's inter-thread communication (or alike) too. It might now be only more exposed with vma-based locks as we can do more parallelism now. There are older hard to reproduce bugs in go with similar symptoms (we see this error sometimes now too): https://github.com/golang/go/issues/15246 Or this 2016 bug is a red herring. Hard to tell... >> thanks, -- js suse labs