Hi Coly, I am not able to see this issue on 5.18.0-051800-generic (https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.18/amd64/), so I am guessing its been fixed since 5.15.50 sometime. If you are aware of which commit may be the fix please let me know. I will keep testing on 5.18.0-051800-generic to see if I see it ever. Regards, Nikhil. On Wed, 29 Jun 2022 at 16:03, Nikhil Kshirsagar <nkshirsagar@xxxxxxxxx> wrote: > > Hi Coly, > > please use this as a reference, this is the source code to refer to > for the kernel i was able to reproduce this on > (https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.15.50/) > > > commit 18a33c8dabb88b50b860e0177a73933f2c0ddf68 (tag: v5.15.50) > Author: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> > Date: Sat Jun 25 15:18:40 2022 +0200 > > Linux 5.15.50 > > Link: https://lore.kernel.org/r/20220623164322.288837280@xxxxxxxxxxxxxxxxxxx > Tested-by: Florian Fainelli <f.fainelli@xxxxxxxxx> > Tested-by: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx> > Tested-by: Bagas Sanjaya <bagasdotme@xxxxxxxxx> > Tested-by: Jon Hunter <jonathanh@xxxxxxxxxx> > Tested-by: Sudip Mukherjee <sudip.mukherjee@xxxxxxxxxxxxxxx> > Tested-by: Ron Economos <re@xxxxxxxx> > Tested-by: Guenter Roeck <linux@xxxxxxxxxxxx> > Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> > > I am able to reproduce this bug on older kernels too, like 5.4.0-121. > I will also test the latest upstream kernel soon. > > Regards, > Nikhil. > > On Wed, 29 Jun 2022 at 13:47, Coly Li <colyli@xxxxxxx> wrote: > > > > > > > > > 2022年6月29日 16:09，Nikhil Kshirsagar <nkshirsagar@xxxxxxxxx> 写道： > > > > > > Hi Coly, > > > > > > Note I used partitions for the bcache as well as the hdd, not sure if > > > that's a factor. > > > > > > the kernel is upstream kernel - > > > > > > # uname -a > > > Linux bronzor 5.15.50-051550-generic #202206251445 SMP Sat Jun 25 > > > 14:51:22 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux > > > > > > Hi Nikhil, > > > > I don’t find the commit id 767db4b286c3e101ac220b813c873f492d9e4ee8 fro neither Linus tree nor stable tree. > > > > The tree you mentioned at https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.15.50/cod/mainline/v5.15.50 (767db4b286c3e101ac220b813c873f492d9e4ee8), I am not sure whether it is a clone of Linus tree or stable tree. Maybe you may try v5.15.50 from the stable tree (git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git), then we can focus on identical code base. > > > > Thanks. > > > > Coly Li > > > > > > >>>>>> > > > > [snipped] > > >>>>>> > > >>>>>> Is this a bug? It's in writeback mode. I'd setup the cache and run stuff like, > > >>>>>> > > >>>>>> echo 0 > /sys/block/bcache0/bcache/sequential_cutoff > > >>>>>> > > >>>>>> I had also echoed 0 into congested_read_threshold_us, > > >>>>>> congested_write_threshold_us. > > >>>>>> > > >>>>>> echo writeback > /sys/block/bcache0/bcache/cache_mode > > >>>>> > > >>>>> Where do you get the kernel? If this is stable kernel, could you give me the HEAD commit id? > > >>>>> > > >>>>> Coly Li > > >>>>> > > >>> > >
