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Date: Wed, 6 Jan 2021 23:00:45 +0100 From: Arnd Bergmann <arnd@...nel.org> To: Will Deacon <will@...nel.org> Cc: Russell King - ARM Linux admin <linux@...linux.org.uk>, Mark Rutland <mark.rutland@....com>, Linux ARM <linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "Theodore Ts'o" <tytso@....edu>, Andreas Dilger <adilger.kernel@...ger.ca>, Ext4 Developers List <linux-ext4@...r.kernel.org> Subject: Re: Aarch64 EXT4FS inode checksum failures - seems to be weak memory ordering issues On Wed, Jan 6, 2021 at 10:04 PM Arnd Bergmann <arnd@...nel.org> wrote: > On Wed, Jan 6, 2021 at 6:22 PM Will Deacon <will@...nel.org> wrote: > > On Wed, Jan 06, 2021 at 01:52:53PM +0000, Russell King - ARM Linux admin wrote: > > I tried the Image-5.9.0 on a virtual machine with seven CPUs (two clusters) > running in an M1 mac mini and ran these commands inside. > > > With that, I see the following after ten seconds or so: > > > > EXT4-fs error (device sda2): ext4_lookup:1707: inode #674497: comm md5sum: iget: checksum invalid > > > > Russell, Mark -- does this recipe explode reliably for you too? > > Negative unfortunately -- no checksum mismatch so far, with 10 minutes > elapsed. I'll keep it running a bit longer. I managed to trigger the checksum mismatch once now, after around 40 minutes, with a second run going for 20 minutes without mismatch. So it's not easily reproducible for me, but it does help to rule out at least some of the hardware specific theories -- it's not just the Cortex-A72, nor the CCI doing something weird, as neither of them are in use here. This is the output I got: EXT4-fs error (device vda2): ext4_lookup:1707: inode #1185501: comm md5sum: iget: checksum invalid Aborting journal on device vda2-8. EXT4-fs error (device vda2): ext4_journal_check_start:83: Detected aborted journal EXT4-fs (vda2): Remounting filesystem read-only EXT4-fs (vda2): Remounting filesystem read-only EXT4-fs error (device vda2): ext4_journal_check_start:83: Detected aborted journal Arnd
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