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Tue, 16 Mar 2021 14:21:41 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Shakeel Butt Date: Tue, 16 Mar 2021 14:21:29 -0700 Message-ID: Subject: Re: [BUG -next] "memcg: charge before adding to swapcache on swapin" broken To: Heiko Carstens Cc: Andrew Morton , Roman Gushchin , Johannes Weiner , Hugh Dickins , Juergen Christ , Christian Borntraeger , Vasily Gorbik , Linux MM , Linux-Next Mailing List Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 51979C0007C0 X-Stat-Signature: hjzxygbz8xwwtx6jchdwhk1mq5589xfg Received-SPF: none (google.com>: No applicable sender policy available) receiver=imf03; identity=mailfrom; envelope-from=""; helo=mail-lf1-f50.google.com; client-ip=209.85.167.50 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1615929703-396831 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Hi Heiko, On Tue, Mar 16, 2021 at 2:08 PM Heiko Carstens wrote: > > Hi Shakeel, > > your commit 3a9ca1b0ac0f ("memcg: charge before adding to swapcache on > swapin") in linux-next 20210316 appears to cause user process faults / > crashes on s390 like: > > User process fault: interruption code 003b ilc:3 in sshd[2aa15280000+df000] > Failing address: 0000000000000000 TEID: 0000000000000800 > Fault in primary space mode while using user ASCE. > AS:00000000966b41c7 R3:0000000000000024 > CPU: 0 PID: 401 Comm: sshd Not tainted 5.12.0-rc3-00048-geba7667a8534 #10 > Hardware name: IBM 8561 T01 703 (z/VM 7.2.0) > User PSW : 0705000180000000 0000000000000000 > R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:1 AS:0 CC:0 PM:0 RI:0 EA:3 > User GPRS: 0000000000000000 fffffffffffff000 0000000000000001 000002aa157b88f0 > 000002aa157c43c0 0000000000000000 0000000000000000 0000000000000000 > 0000000000000000 0000000000000000 0000000000000000 0000000000000000 > 0000000000000000 0000000000000000 0000000000000000 0000000000000000 > User Code: Bad PSW. > Thanks for the report. Can you please explain a bit what the above report tells? I will try the following on the machines I have with that patch. > This was bisected using elfutils selftests: > > autoreconf -fi > ./configure --enable-maintainer-mode --disable-debuginfod > make -j $(nproc) > cd tests > make -j $(nproc) check