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dkim=pass header.d=gmail.com header.s=20210112 header.b=hL4zzWhE; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (imf15.hostedemail.com: domain of matorola@gmail.com designates 209.85.221.53 as permitted sender) smtp.mailfrom=matorola@gmail.com X-Rspam-User: X-Rspamd-Server: rspam12 X-HE-Tag: 1668595527-747305 X-Bogosity: Ham, tests=bogofilter, spamicity=0.006644, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Nov 16, 2022 at 11:49 AM hev wrote: > > Hello Peter, > > I see a random crash issue on the LoongArch system, that is caused by > commit 0ccf7f1 ("mm/thp: carry over dirty bit when thp splits on > pmd"). > > Now, the thing is already resolved. The root cause is arch's mkdirty > is set hardware writable bit in unconditional. That breaks > write-protect and then breaks COW. > > Here is a simple and fast testcase (It may be helpful for sparc64): > https://gist.github.com/heiher/72919fae6b53f04cac606a9631100506 > (assertion: c sum == 0) Just tried on my sparc64 VM - fixed vs old (non-patched) kernels... fixed kernel (6.1.0-rc5) running ./a.out: mator@ttip:~$ ./a.out c sum: 0 p sum: 35184372088832 c sum: 0 p sum: 35184372088832 c sum: 0 p sum: 35184372088832 c sum: 0 p sum: 35184372088832 c sum: 0 p sum: 35184372088832 ... old (non-patched) kernel (6.1.0-rc4) : mator@ttip:~$ ./a.out c sum: 35150012350464 p sum: 35184372088832 c sum: 35150012350464 p sum: 35184372088832 ...