On 04.10.2016 10:41, Jan Kara wrote: > The problem looks like memory corruption: [...] Huh, very interesting -- thanks for the walkthrough! > Anyway, adding linux-mm to CC since this does not look ext4 related but > rather mm related issue. > > Bugs like these are always hard to catch, usually it's some flaky device > driver, sometimes also flaky HW. You can try running kernel with various > debug options enabled in a hope to catch the code corrupting memory > earlier - e.g. CONFIG_DEBUG_PAGE_ALLOC sometimes catches something, > CONFIG_SLAB_DEBUG can be useful as well. Another option is to get a > crashdump when the oops happens (although that's going to be a pain to > setup on such a small machine) and then look at which places point to > the corrupted memory - sometimes you can find old structures pointing to > the place and find the use-after-free issue or stuff like that... Uhh, that sounds painful. So I'm following Ted's advice and building myself a 4.8 as we speak. If the problem is fixed, would it be of any help to trace the source by going back to the 4.4.0 and reproduce with the debug symbols you mentioned? I don't think a memdump would be difficult on the machine (while it certainly has a small form factor, it's got a 1 TB hdd and 16 GB of RAM, so it's not really that small). Cheers, Johannes -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>