Dear Linux folks,
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 [ 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] ================================================================================
Kind regards, Paul
