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I have >> bisected the issue to >> >> f9aa460672c9 ("driver core: Refactor fw_devlink feature") > > I skimmed through your email and I'll read it more closely tomorrow, > but it wasn't clear if you see this on Linus's tip of the tree too. > Asking because of: > https://lore.kernel.org/lkml/20210930085714.2057460-1-yangyingliang@huawei.com/ > > Also, a couple of other data points that _might_ help. Try kernel > command line option fw_devlink=permissive vs fw_devlink=on (I forget > if this was the default by 5.10) vs fw_devlink=off. > > I'm expecting "off" to fix the issue for you. But if permissive vs on > shows a difference driver issues would start becoming a real > possibility. > > -Saravana Thanks for the quick reply! I don't think I tested the very tip of Linus tree before, only latest rc or something like that, but now I have. I.e. 5859a2b19911 ("Merge branch 'ucount-rlimit-fixes-for-v5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace") It would have been typical if an issue that existed for a couple of years had been fixed the last few weeks, but alas, no. On that kernel, and with whatever the default fw_devlink value is, the issue is there. It's a bit hard to tell if the incident probability is the same when trying fw_devlink arguments, but roughly so, and I do not have to wait for long to get a bad hash with the first reproducer while :; do cat testfile | sha256sum; done The output is typical: 78464c59faa203413aceb5f75de85bbf4cde64f21b2d0449a2d72cd2aadac2a3 - 4f9173f63cb2e13d1470e59e1b5c657f3b0f4f2e9a55ab6facffbb03f34ce04d - 4f9173f63cb2e13d1470e59e1b5c657f3b0f4f2e9a55ab6facffbb03f34ce04d - 4f9173f63cb2e13d1470e59e1b5c657f3b0f4f2e9a55ab6facffbb03f34ce04d - 4f9173f63cb2e13d1470e59e1b5c657f3b0f4f2e9a55ab6facffbb03f34ce04d - e03c5524ac6d16622b6c43f917aae730bc0793643f461253c4646b860c1a7215 - 1b8db6218f481cb8e4316c26118918359e764cc2c29393fd9ef4f2730274bb00 - 4f9173f63cb2e13d1470e59e1b5c657f3b0f4f2e9a55ab6facffbb03f34ce04d - 4f9173f63cb2e13d1470e59e1b5c657f3b0f4f2e9a55ab6facffbb03f34ce04d - 7d60bf848911d3b919d26941be33c928c666e9e5666f392d905af2d62d400570 - 212e1fe02c24134857ffb098f1834a2d87c655e0e5b9e08d4929f49a070be97c - 4f9173f63cb2e13d1470e59e1b5c657f3b0f4f2e9a55ab6facffbb03f34ce04d - 7e33e751eb99a0f63b4f7d64b0a24f3306ffaf7c4bc4b27b82e5886c8ea31bc3 - d7a1f08aa9d0374d46d828fc3582f5927e076ff229b38c28089007cd0599c645 - 4fc963b7c7b14df9d669500f7c062bf378ff2751f705bb91eecd20d2f896f6fe - 4f9173f63cb2e13d1470e59e1b5c657f3b0f4f2e9a55ab6facffbb03f34ce04d - 9360d886046c12d983b8bc73dd22302c57b0aafe58215700604fa977b4715fbe - 4f9173f63cb2e13d1470e59e1b5c657f3b0f4f2e9a55ab6facffbb03f34ce04d - Setting fw_devlink=off makes no difference, AFAICT. So, just to double-check I went back to 5.11.22 with the two mentioned patches reverted [1], plus an added backport of c73960bb0a43 ("gpiolib: allow line names from device props to override driver names") in order to make userspace behave as similarly as possible. I left that running for an hour or so with 350-ish hashes calculated correctly. Which is no proof that there is no latent issue of course, but at the very least a great deal more stable than later kernels. Cheers, Peter [1] f9aa460672c9 ("driver core: Refactor fw_devlink feature") 2d09e6eb4a6f ("driver core: Delete pointless parameter in fwnode_operations.add_links")