Hi,
If I run blktests test block/027 the warning and bug shown below appear.
It is the first time that I see a complaint like this while running
blktests. I have not yet tried to root-cause this issue.
root[7931]: run blktests block/027
[ ... ]
kernel: ------------[ cut here ]------------
kernel: ODEBUG: init active (active state 0) object type: work_struct hint: css_release_work_fn+0x0/0x480
kernel: WARNING: CPU: 38 PID: 498 at lib/debugobjects.c:502 debug_print_object+0xda/0x110
kernel: Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.0-debian-1.16.0-4 04/01/2014
kernel: Workqueue: cgwb_release cgwb_release_workfn
kernel: RIP: 0010:debug_print_object+0xda/0x110
kernel: Call Trace:
kernel: <TASK>
kernel: __debug_object_init+0x217/0x290
kernel: debug_object_init+0x16/0x20
kernel: __init_work+0x20/0x30
kernel: css_release+0x1f/0xb0
kernel: percpu_ref_put_many.constprop.0+0x150/0x160
kernel: blkcg_destroy_blkgs+0x20b/0x230
kernel: blkcg_unpin_online+0x4e/0x90
kernel: cgwb_release_workfn+0xba/0x210
kernel: process_one_work+0x57d/0xa80
kernel: worker_thread+0x90/0x650
kernel: kthread+0x185/0x1c0
kernel: ret_from_fork+0x1f/0x30
kernel: </TASK>
kernel: irq event stamp: 121765
kernel: hardirqs last enabled at (121775): [<ffffffff811ae168>] __up_console_sem+0x58/0x60
kernel: hardirqs last disabled at (121792): [<ffffffff811ae14d>] __up_console_sem+0x3d/0x60
kernel: softirqs last enabled at (121790): [<ffffffff824004d0>] __do_softirq+0x4d0/0x757
kernel: softirqs last disabled at (121785): [<ffffffff810e4e61>] __irq_exit_rcu+0xd1/0x140
kernel: ---[ end trace 0000000000000000 ]---
kernel: BUG: sleeping function called from invalid context at kernel/workqueue.c:3010
kernel: in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 498, name: kworker/38:1
kernel: preempt_count: 0, expected: 0
kernel: RCU nest depth: 1, expected: 0
kernel: 3 locks held by kworker/38:1/498:
kernel: #0: ffff888102c6b538 ((wq_completion)cgwb_release){+.+.}-{0:0}, at: process_one_work+0x479/0xa80
kernel: #1: ffff88810357fdf0 ((work_completion)(&wb->release_work)){+.+.}-{0:0}, at: process_one_work+0x479/0xa80
kernel: #2: ffffffff830c52a0 (rcu_read_lock){....}-{1:2}, at: percpu_ref_put_many.constprop.0+0x0/0x160
kernel: CPU: 38 PID: 498 Comm: kworker/38:1 Tainted: G W E 6.1.0-rc6-dbg #5
kernel: Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.0-debian-1.16.0-4 04/01/2014
kernel: Workqueue: cgwb_release cgwb_release_workfn
kernel: Call Trace:
kernel: <TASK>
kernel: show_stack+0x4e/0x53
kernel: dump_stack_lvl+0x51/0x66
kernel: dump_stack+0x10/0x12
kernel: __might_resched.cold+0x173/0x198
kernel: __might_sleep+0x72/0xe0
kernel: start_flush_work+0x30/0x560
kernel: __flush_work+0xf7/0x170
kernel: __cancel_work_timer+0x22a/0x2c0
kernel: work_fixup_init+0x20/0x40
kernel: __debug_object_init+0x23b/0x290
kernel: debug_object_init+0x16/0x20
kernel: __init_work+0x20/0x30
kernel: css_release+0x1f/0xb0
kernel: percpu_ref_put_many.constprop.0+0x150/0x160
kernel: blkcg_destroy_blkgs+0x20b/0x230
kernel: blkcg_unpin_online+0x4e/0x90
kernel: cgwb_release_workfn+0xba/0x210
kernel: process_one_work+0x57d/0xa80
kernel: worker_thread+0x90/0x650
kernel: kthread+0x185/0x1c0
kernel: ret_from_fork+0x1f/0x30
kernel: </TASK>
kernel: null_blk: disk nullb0 created
kernel: null_blk: module loaded
