Hello, I have a couple of machines running Debian GNU/Linux 8 using an NFS-ro-mounted root filesystem.
The systems seem to get bitten by VFS changes in some (unfortunaly somewhat difficult to reproduce) circumstances. The effect is, that /dev (dectmpfs) gets unmounted for some strange reason. I added the following debug code to fs/namespace.c printk(KERN_DEBUG "%s: %s\n", __func__, dentry->d_name.name); dump_stack(); And this is what I get if one of those events happen: __detach_mounts: dev CPU: 1 PID: 5551 Comm: modtrack Not tainted 4.1.3-debug-00287-g0fe8050-dirty #1 Hardware name: Dell Inc. Precision WorkStation T3400 /0TP412, BIOS A03 01/31/2008 ffff880127183c18 ffff880127183bc8 ffffffff815605f8 ffff88012bc4fcb0 ffff880126c16198 ffff880127183bf8 ffffffff81106cf7 000000000000000f ffff880126c16198 ffff880127183c18 ffff880127183d00 ffff880127183c48 Call Trace: [<ffffffff815605f8>] dump_stack+0x4c/0x6e [<ffffffff81106cf7>] __detach_mounts+0x2b/0x12c [<ffffffff810ffbb6>] d_invalidate+0x9a/0xc8 [<ffffffff810f6b13>] lookup_fast+0x1f5/0x26f [<ffffffff810f6dba>] do_last.isra.43+0xd6/0x9fb [<ffffffff810f916e>] path_openat+0x1d1/0x53e [<ffffffff810f9f41>] ? user_path_at_empty+0x63/0x93 [<ffffffff810f9fe6>] do_filp_open+0x35/0x85 [<ffffffff811f1893>] ? find_next_zero_bit+0x17/0x1d [<ffffffff81104225>] ? __alloc_fd+0xdd/0xef [<ffffffff810ec966>] do_sys_open+0x146/0x1d5 [<ffffffff810eca1f>] SyS_openat+0xf/0x11 [<ffffffff81565a17>] system_call_fastpath+0x12/0x6a Regards Sven P.S.: Kernel is vanilla 4.1.3 with aufs patches, but aufs is not related in this problem. -- Der "normale Bürger" ist nicht an der TU Dresden und schreibt auch nicht mit mutt. (Ulli Kuhnle in de.comp.os.unix.discussion) /me is giggls@ircnet, http://sven.gegg.us/ on the Web -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
