On Wed, Dec 21, 2016 at 08:01:37PM -0500, Jon Maloy wrote:
> commit cbbd26b8b1a6 ("[iov_iter] new primitives - copy_from_iter_full()
> and friends") replaced calls to copy_from_iter() in the function
> tipc_msg_build(). This causes a an immediate crash as follows:Very interesting. > [ 1209.597076] BUG: unable to handle kernel NULL pointer dereference at > 0000000000000008 > [ 1209.607025] IP: copy_from_iter_full+0x43/0x290 > [ 1209.689257] tipc_msg_build+0xe1/0x590 [tipc] > [ 1209.691479] ? _raw_spin_unlock_bh+0x1e/0x20 > [ 1209.694641] ? tipc_node_find+0x30/0xa0 [tipc] > [ 1209.696789] __tipc_sendmsg+0x189/0x480 [tipc] > [ 1209.699017] ? remove_wait_queue+0x4d/0x60 > [ 1209.700354] tipc_connect+0x15f/0x1b0 [tipc] > [ 1209.701684] SYSC_connect+0xd9/0x110 I don't believe that it's something tipc-specific; could you post an objdump of copy_from_iter_full() in your kernel? That smells like a bug in there and it really ought to be fixed...
