In-Reply-To: <19427cc3-3372-9b02-4b92-096fbe328...@molgen.mpg.de> On Fri, Jul 20, 2018 at 09:53:21AM +0200, Paul Menzel wrote: > Dear Linux folks,
Hi, > Enabling the undefined behavior sanitizer and building GNU/Linux 4.18-rc5+ > (with some unrelated commits) with GCC 8.1.0 from Debian Sid/unstable, the > warning below is shown. > > > [ 0.958688] > > ================================================================================ > > [ 0.959029] UBSAN: Undefined behaviour in lib/radix-tree.c:123:14 That's in get_slot_offset(), and I think this is addressed by the patch [1] I previously sent. There are at least a couple of instances in the radix tree code, and I had intended to address them together, but I haven't had the chance over the last couple of weeks. I will try to get back to that soon. > > [ 0.959212] member access within null pointer of type 'const struct > > radix_tree_node' > > [ 0.959472] CPU: 0 PID: 24 Comm: kworker/0:2 Not tainted > > 4.18.0-rc5-00316-g4864b68cedf2 #104 > > [ 0.959475] Hardware name: ASROCK E350M1/E350M1, BIOS TIMELESS 01/01/1970 > > [ 0.959488] Workqueue: events_power_efficient ioc_release_fn > > [ 0.959492] Call Trace: > > [ 0.959501] dump_stack+0x55/0x89 > > [ 0.959507] ubsan_epilogue+0xb/0x33 > > [ 0.959511] handle_null_ptr_deref+0x7f/0x90 > > [ 0.959516] __ubsan_handle_type_mismatch_v1+0x55/0x60 > > [ 0.959521] __radix_tree_delete+0xc5/0xe0 > > [ 0.959525] radix_tree_delete_item+0x5f/0xf0 > > [ 0.959529] radix_tree_delete+0xa/0x10 > > [ 0.959532] ioc_destroy_icq+0x58/0x1f0 > > [ 0.959538] ? free_tty_struct+0x34/0x50 > > [ 0.959541] ioc_release_fn+0x9c/0x1a0 > > [ 0.959548] process_one_work+0x220/0x700 > > [ 0.959553] worker_thread+0x5a/0x690 > > [ 0.959557] kthread+0x14e/0x200 > > [ 0.959561] ? drain_workqueue+0x290/0x290 > > [ 0.959565] ? kthread_create_worker_on_cpu+0x30/0x30 > > [ 0.959568] ret_from_fork+0x1c/0x38 > > [ 0.959572] > > ================================================================================ Thanks, Mark. [1] https://lkml.kernel.org/r/20180706134144.48446-1-mark.rutl...@arm.com
