linux-kernel - Regression with v5.18-rc1 tag on STM32F7 and STM32H7 based boards

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Date:   Tue, 5 Apr 2022 17:15:57 +0200
From:   Patrice CHOTARD <patrice.chotard@...s.st.com>
To:     <hughd@...gle.com>, <mpatocka@...hat.com>, <lczerner@...hat.com>,
        <djwong@...nel.org>, <hch@....de>, <zkabelac@...hat.com>,
        <djwong@...nel.org>, <miklos@...redi.hu>, <bp@...e.de>,
        <akpm@...ux-foundation.org>
CC:     Alexandre TORGUE - foss <alexandre.torgue@...s.st.com>,
        Valentin CARON - foss <valentin.caron@...s.st.com>,
        <linux-stm32@...md-mailman.stormreply.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        <linux-fsdevel@...r.kernel.org>, <linux-mm@...ck.org>
Subject: Regression with v5.18-rc1 tag on STM32F7 and STM32H7 based boards

Hi Guys

We found an issue with last kernel tag v5.18-rc1 on stm32f746-disco and 
stm32h743-disco boards (ARMV7-M SoCs).

Kernel hangs when executing SetPageUptodate(ZERO_PAGE(0)); in mm/filemap.c.

By reverting commit 56a8c8eb1eaf ("tmpfs: do not allocate pages on read"), 
kernel boots without any issue.

Thanks
Patrice