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<4f4f2c97f7393f21f507c58def88514c9f670e0a.camel@infinera.com> From: Christophe Leroy Message-ID: <43a21b20-4214-1043-0919-1bd8078d14a6@c-s.fr> Date: Mon, 23 Mar 2020 16:31:40 +0100 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0 MIME-Version: 1.0 In-Reply-To: <4f4f2c97f7393f21f507c58def88514c9f670e0a.camel@infinera.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: fr Content-Transfer-Encoding: 8bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Le 23/03/2020 à 16:08, Joakim Tjernlund a écrit : > On Mon, 2020-03-23 at 15:45 +0100, Christophe Leroy wrote: >> CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe. >> >> >> Le 23/03/2020 à 15:43, Christophe Leroy a écrit : >>> >>> Le 23/03/2020 à 15:17, Joakim Tjernlund a écrit : >>>> In __die(), see below, there is this call to notify_send() with >>>> SIGSEGV hardcoded, this seems odd >>>> to me as the variable "err" holds the true signal(in my case SIGBUS) >>>> Should not SIGSEGV be replaced with the true signal no.? >>> >>> As far as I can see, comes from >>> https://nam03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgit.kernel.org%2Fpub%2Fscm%2Flinux%2Fkernel%2Fgit%2Ftorvalds%2Flinux.git%2Fcommit%2F%3Fid%3D66fcb1059&data=02%7C01%7CJoakim.Tjernlund%40infinera.com%7C4291ac1b501e4296869a08d7cf38cdb4%7C285643de5f5b4b03a1530ae2dc8aaf77%7C1%7C0%7C637205715189366995&sdata=Z2bFsmDlD2MKhLACQvayk9ejz0dqgMEOlBTlocAmtTg%3D&reserved=0 >>> >> >> And >> https://nam03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgit.kernel.org%2Fpub%2Fscm%2Flinux%2Fkernel%2Fgit%2Ftorvalds%2Flinux.git%2Fcommit%2F%3Fid%3Dae87221d3ce49d9de1e43756da834fd0bf05a2ad&data=02%7C01%7CJoakim.Tjernlund%40infinera.com%7C4291ac1b501e4296869a08d7cf38cdb4%7C285643de5f5b4b03a1530ae2dc8aaf77%7C1%7C0%7C637205715189366995&sdata=97kyz3Ur88BhDUUYzya5t%2FFQVhXYu6qiHoW8hsEg81s%3D&reserved=0 >> shows it is (was?) similar on x86. >> > > I tried to follow that chain thinking it would end up sending a signal to user space but I cannot see > that happens. Seems to be related to debugging. > > In short, I cannot see any signal being delivered to user space. If so that would explain why > our user space process never dies. > Is there a signal hidden in machine_check handler for SIGBUS I cannot see? > Isn't it done in do_exit(), called from oops_end() ? Christophe