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([2001:8b0:aba:5f3c:eef:5a49:b13d:a655]) by smtp.gmail.com with ESMTPSA id cc8-20020a5d5c08000000b003392af92996sm174186wrb.101.2024.01.26.05.03.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 26 Jan 2024 05:03:59 -0800 (PST) Message-ID: <9860cd401db66e6bf10e9e41df148b25ee6c73fd.camel@linuxfoundation.org> Subject: Re: [PULL 05/13] linux-user: Use walk_memory_regions for open_self_maps From: Richard Purdie To: Richard Henderson , qemu-devel@nongnu.org Cc: Helge Deller , Ilya Leoshkevich Date: Fri, 26 Jan 2024 13:03:58 +0000 In-Reply-To: <20230901204251.137307-6-richard.henderson@linaro.org> References: <20230901204251.137307-1-richard.henderson@linaro.org> <20230901204251.137307-6-richard.henderson@linaro.org> Autocrypt: addr=richard.purdie@linuxfoundation.org; prefer-encrypt=mutual; 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YNvg== Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.0-1 MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::331; envelope-from=richard.purdie@linuxfoundation.org; helo=mail-wm1-x331.google.com X-Spam_score_int: -33 X-Spam_score: -3.4 X-Spam_bar: --- X-Spam_report: (-3.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.313, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Hi, I've run into a problem with this change. We (Yocto Project) upgraded to qemu 8.2.0 recently and after that we started seeing errors cross compiling webkitgtk on x86_64 for x86_64 during the introspection code which runs under user mode qemu. The error we see is: qemu-x86_64: QEMU internal SIGSEGV {code=3DMAPERR, addr=3D0x20} Segmentation fault e.g. here: https://autobuilder.yoctoproject.org/typhoon/#/builders/40/builds/8488/step= s/11/logs/stdio This usually seems to happen on our debian 11 based autobuilder machines. I took one of the broken builds and bisected it to this change (commit 7b7a3366e142d3baeb3fd1d3660a50e7956c19eb). There was a change in output from commit 7dfd3ca8d95f9962cdd2ebdfcdd699279b98fa18, before that it was: ERROR:../git/accel/tcg/cpu-exec.c:532:cpu_exec_longjmp_cleanup: assertion f= ailed: (cpu =3D=3D current_cpu) Bail out! ERROR:../git/accel/tcg/cpu-exec.c:532:cpu_exec_longjmp_cleanup: a= ssertion failed: (cpu =3D=3D current_cpu) After digging into the code and trying to work out what is going on, I realised that n is NULL when it fails so this makes the problem "go away": diff --git a/linux-user/syscall.c b/linux-user/syscall.c index e384e14248..2577fb770d 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -8085,6 +8085,9 @@ static int open_self_maps_2(void *opaque, target_ulon= g guest_start, while (1) { IntervalTreeNode *n =3D interval_tree_iter_first(d->host_maps, host_start, host_start)= ; + if (!n) { + return 0; + } MapInfo *mi =3D container_of(n, MapInfo, itree); uintptr_t this_hlast =3D MIN(host_last, n->last); target_ulong this_gend =3D h2g(this_hlast) + 1; I'm hoping that might be enough to give you an idea of what is going on and what the correct fix may be? I haven't managed to make an isolated test to reproduce the issue yet. Cheers, Richard