FYI, we noticed the below changes on git://flatbed.openfabrics.org/~amirv/linux.git for-upstream commit 97defe1ecf868b8127f8e62395499d6a06e4c4b1 ("rhashtable: Per bucket locks & deferred expansion/shrinking") Because there are OOM for this commit and its parent commit, I am not sure whether this warning is related to your commit. One possibility, the workqueue is tracked with debugobjects, while the commit is working on a workqueue. +------------------------------------------------------------------+------------+------------+ | | 113948d841 | 97defe1ecf | +------------------------------------------------------------------+------------+------------+ | boot_successes | 0 | 0 | | boot_failures | 10 | 10 | | Kernel_panic-not_syncing:Out_of_memory_and_no_killable_processes | 10 | 10 | | backtrace:do_fork | 5 | | | backtrace:lock_torture_stats | 4 | 10 | | backtrace:pcpu_balance_workfn | 1 | | | WARNING:at_lib/debugobjects.c:#__debug_object_init() | 0 | 10 | | backtrace:__debug_object_init | 0 | 10 | | backtrace:warn_slowpath_null | 0 | 10 | | backtrace:debug_object_init | 0 | 10 | | backtrace:__init_work | 0 | 10 | | backtrace:rhashtable_init | 0 | 10 | | backtrace:test_rht_init | 0 | 10 | | backtrace:kernel_init_freeable | 0 | 10 | | backtrace:init_timer_key | 0 | 10 | +------------------------------------------------------------------+------------+------------+ [ 0.412102] Running resizable hashtable tests... [ 0.413071] ODEBUG: object is on stack, but not annotated [ 0.414124] ------------[ cut here ]------------ [ 0.415116] WARNING: CPU: 0 PID: 1 at lib/debugobjects.c:301 __debug_object_init+0x3e7/0x4a3() [ 0.417178] Modules linked in: [ 0.418107] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.19.0-rc2-00457-g104bea1 #170 [ 0.419767] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 0.420000] 0000000000000009 ffff880013cc3b38 ffffffff81963311 0000000000000cfc [ 0.420000] 0000000000000000 ffff880013cc3b78 ffffffff8107e830 ffff880013cc3b98 [ 0.420000] ffffffff8144e054 ffff880013cc3d40 ffffffff837be688 ffff880013c4fbf8 [ 0.420000] Call Trace: [ 0.420000] [] dump_stack+0xa0/0xd5 [ 0.420000] [] warn_slowpath_common+0xc8/0xf7 [ 0.420000] [] ? __debug_object_init+0x3e7/0x4a3 [ 0.420000] [] warn_slowpath_null+0x23/0x2c [ 0.420000] [] __debug_object_init+0x3e7/0x4a3 [ 0.420000] [] debug_object_init+0x22/0x2b [ 0.420000] [] __init_work+0x37/0x40 [ 0.420000] [] rhashtable_init+0x19a/0x239 [ 0.420000] [] ? up+0x50/0x5c [ 0.420000] [] ? test_rht_lookup+0x11b/0x11b [ 0.420000] [] test_rht_init+0xa6/0x593 [ 0.420000] [] ? __roundup_pow_of_two+0x21/0x21 [ 0.420000] [] ? jhash+0x1b2/0x1b2 [ 0.420000] [] ? rht_grow_above_75+0x1f/0x1f [ 0.420000] [] ? __roundup_pow_of_two+0x21/0x21 [ 0.420000] [] ? jhash+0x1b2/0x1b2 [ 0.420000] [] ? rht_grow_above_75+0x1f/0x1f [ 0.420000] [] ? test_rht_lookup+0x11b/0x11b [ 0.420000] [] do_one_initcall+0x190/0x266 [ 0.420000] [] kernel_init_freeable+0x37e/0x480 [ 0.420000] [] ? rest_init+0x21b/0x21b [ 0.420000] [] kernel_init+0x10/0x175 [ 0.420000] [] ret_from_fork+0x7c/0xb0 [ 0.420000] [] ? rest_init+0x21b/0x21b [ 0.420000] ---[ end trace 77992957a24f572d ]--- [ 0.420010] ODEBUG: object is on stack, but not annotated Thanks, Huang, Ying