BUG: workqueue lockup (5)

BUG: workqueue lockup (5)
Status: upstream: reported C repro on 2020/01/14 22:04
Reported-by: syzbot+f0b66b520b54883d4b9d@syzkaller.appspotmail.com
First crash: 420d, last: 8d08h

Cause bisection: introduced by (bisect log) :
commit ebe02de2c60caa3ee5a1b39c7c8b2a40e1fda2d8
Author: Himanshu Jha <himanshujha199640@gmail.com>
Date: Tue Aug 29 13:12:27 2017 +0000

drm/amd/powerplay/hwmgr: Remove null check before kfree

Crash: WARNING in __x86_set_memory_region (log)
Repro: C syz .config

similar bugs (8):
Kernel	Title	Repro	Count	Last	Reported	Patched	Status
upstream	BUG: workqueue lockup (4)	C	47	475d	881d	16/21	fixed on 2019/12/13 00:31
upstream	BUG: workqueue lockup (2)	C	406	1031d	1189d	6/21	fixed on 2018/05/13 10:02
linux-4.14	BUG: workqueue lockup	C	176	21h20m	677d	0/1	upstream: reported C repro on 2019/04/29 11:26
upstream	BUG: workqueue lockup	C	172	1212d	1222d	3/21	fixed on 2017/11/11 01:37
upstream	BUG: workqueue lockup (3)	C	1215	975d	1028d	9/21	fixed on 2018/07/09 18:05
android-414	BUG: workqueue lockup	C	114	540d	696d	0/1	public: reported C repro on 2019/04/11 00:00
linux-4.19	BUG: workqueue lockup	C	17	23d	684d	0/1	upstream: reported C repro on 2019/04/22 20:37
android-49	BUG: workqueue lockup	C	69	464d	695d	0/3	public: reported C repro on 2019/04/11 08:44

Sample crash report:

BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 277s!
BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 277s!
Showing busy workqueues and worker pools:
workqueue events: flags=0x0
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=8/256 refcnt=9
    pending: kfree_rcu_monitor, usb_gadget_state_work, free_work, usb_gadget_state_work, usb_gadget_state_work, usb_gadget_state_work, cache_reap, check_corruption
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=10/256 refcnt=11
    pending: delayed_fput, rht_deferred_worker, kfree_rcu_monitor, free_work, usb_gadget_state_work, usb_gadget_state_work, psi_avgs_work, defense_work_handler, vmstat_shepherd, cache_reap
workqueue events_power_efficient: flags=0x80
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=7/256 refcnt=8
    pending: gc_worker, fb_flashcursor, neigh_periodic_work, do_cache_clean, neigh_periodic_work, check_lifetime, sync_hw_clock
workqueue mm_percpu_wq: flags=0x8
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=2/256 refcnt=3
    pending: vmstat_update, lru_add_drain_per_cpu
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=2/256 refcnt=4
    pending: vmstat_update, lru_add_drain_per_cpu BAR(1154)
workqueue cgroup_pidlist_destroy: flags=0x0
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/1 refcnt=2
    pending: cgroup_pidlist_destroy_work_fn
workqueue usb_hub_wq: flags=0x4
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=8/256 refcnt=9
    in-flight: 6813:hub_event hub_event, 3839:hub_event hub_event, 6806:hub_event hub_event, 2481:hub_event hub_event
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=4/256 refcnt=5
    in-flight: 5:hub_event hub_event, 2501:hub_event hub_event
workqueue dm_bufio_cache: flags=0x8
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
    pending: work_fn
workqueue ipv6_addrconf: flags=0x40008
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/1 refcnt=2
    pending: addrconf_verify_work
workqueue krxrpcd: flags=0x0
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/1 refcnt=2
    pending: rxrpc_peer_keepalive_worker
pool 0: cpus=0 node=0 flags=0x0 nice=0 hung=278s workers=4 idle: 6819 6810
pool 2: cpus=1 node=0 flags=0x0 nice=0 hung=278s workers=6 idle: 6818 6816

Fix bisection attempts:
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci-upstream-kasan-gce-smack-root	2020/11/07 07:20	upstream	659caaf6	917afeaa	.config	log	report	syz	C

Crashes (74):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci-upstream-kasan-gce-smack-root	2020/06/30 23:05	upstream	9ebcfadb	917afeaa	.config	log	report	syz	C
ci-upstream-kasan-gce-root	2020/05/28 09:58	upstream	b0c3ba31	142a0957	.config	log	report	syz	C
ci-upstream-kasan-gce-root	2020/04/25 09:57	upstream	b4f63322	03d97a1b	.config	log	report	syz	C
ci-upstream-kasan-gce-smack-root	2020/04/23 14:14	upstream	c578ddb3	2e44d63e	.config	log	report	syz	C
ci-upstream-kasan-gce-root	2020/04/20 11:02	upstream	0fe5f9ca	9f7c6d12	.config	log	report	syz	C
ci-upstream-kasan-gce-selinux-root	2020/04/11 07:30	upstream	ab6f762f	a8c6a3f8	.config	log	report	syz	C
ci-upstream-kasan-gce-root	2020/03/30 06:09	upstream	e595dd94	05736b29	.config	log	report	syz	C
ci-upstream-kasan-gce-root	2020/03/21 03:54	upstream	6c90b86a	2c31c529	.config	log	report	syz	C
ci-upstream-kasan-gce-selinux-root	2020/03/18 10:52	upstream	ac309e77	97bc55ce	.config	log	report	syz	C
ci-upstream-kasan-gce-root	2020/03/15 15:46	upstream	d3dca690	749688d2	.config	log	report	syz	C
ci-upstream-kasan-gce-smack-root	2020/03/15 02:29	upstream	69a4d0ba	749688d2	.config	log	report	syz	C
ci-upstream-kasan-gce-selinux-root	2020/03/09 04:58	upstream	61a09258	2e9971bb	.config	log	report	syz	C
ci-upstream-kasan-gce-selinux-root	2020/03/08 11:08	upstream	c2003765	2e9971bb	.config	log	report	syz	C
ci-upstream-kasan-gce-smack-root	2020/03/04 12:59	upstream	63623fd4	c88c7b75	.config	log	report	syz	C
ci-upstream-kasan-gce-selinux-root	2020/02/16 00:48	upstream	829e6944	5d7b90f1	.config	log	report	syz	C
ci-upstream-kasan-gce-smack-root	2020/02/13 10:03	upstream	f2850dd5	84f4fc8a	.config	log	report	syz	C
ci-upstream-kasan-gce	2020/02/13 06:50	upstream	f2850dd5	84f4fc8a	.config	log	report	syz	C
ci-upstream-kasan-gce	2020/02/09 19:08	upstream	fdfa3a67	6ece2ea5	.config	log	report	syz	C
ci-upstream-kasan-gce-root	2020/01/11 06:19	upstream	e69ec487	4de4e9f0	.config	log	report	syz	C
ci-upstream-linux-next-kasan-gce-root	2020/05/11 04:15	linux-next	ac935d22	8742a2b9	.config	log	report	syz	C
ci-upstream-linux-next-kasan-gce-root	2020/04/10 12:45	linux-next	0434e521	a8c6a3f8	.config	log	report	syz	C
ci-upstream-linux-next-kasan-gce-root	2020/03/31 08:39	linux-next	770fbb32	c8d1cc20	.config	log	report	syz	C
ci2-upstream-usb	2020/03/23 03:12	https://github.com/google/kasan.git usb-fuzzer	e17994d1	78267cec	.config	log	report	syz	C
ci2-upstream-usb	2020/03/20 10:39	https://github.com/google/kasan.git usb-fuzzer	e17994d1	2c31c529	.config	log	report	syz	C
ci-qemu-upstream	2021/02/26 10:54	upstream	2c87f7a3	4c37c133	.config	log	report			info	BUG: workqueue lockup
ci-qemu-upstream	2021/02/02 23:07	upstream	3aaf0a27	624dad51	.config	log	report			info	BUG: workqueue lockup
ci-qemu-upstream	2021/02/02 16:13	upstream	88bb507a	19e09687	.config	log	report			info	BUG: workqueue lockup
ci-qemu-upstream	2021/01/30 01:55	upstream	bec4c296	fc9fd31e	.config	log	report			info	BUG: workqueue lockup
ci-qemu-upstream	2021/01/28 09:13	upstream	76c057c8	eefc07f2	.config	log	report			info	BUG: workqueue lockup
ci-qemu-upstream-386	2021/02/02 18:45	upstream	88bb507a	19e09687	.config	log	report			info	BUG: workqueue lockup
ci-qemu-upstream-386	2021/02/02 05:42	upstream	88bb507a	e6b95f32	.config	log	report			info	BUG: workqueue lockup
ci-qemu-upstream-386	2021/02/01 00:33	upstream	6642d600	fc9fd31e	.config	log	report			info	BUG: workqueue lockup
ci-qemu-upstream-386	2021/01/30 18:07	upstream	0e9bcda5	fc9fd31e	.config	log	report			info	BUG: workqueue lockup
ci-upstream-bpf-kasan-gce	2021/02/26 18:58	bpf	557c223b	4c37c133	.config	log	report			info	BUG: workqueue lockup
ci-upstream-kasan-gce	2021/01/17 02:30	upstream	0da0a8a0	65a7a854	.config	log	report			info
ci-upstream-kasan-gce	2021/01/16 01:20	upstream	5ee88057	65a7a854	.config	log	report			info
ci-upstream-kasan-gce	2020/12/27 03:51	upstream	f838f8d2	821e0b09	.config	log	report			info
ci-upstream-kasan-gce-root	2020/12/08 23:38	upstream	7d8761ba	a7f7f4a4	.config	log	report			info
ci-qemu-upstream	2020/11/15 18:12	upstream	e28c0d7c	1bf9a662	.config	log	report			info
ci-qemu-upstream	2020/09/07 18:30	upstream	fffe3ae0	abf9ba4f	.config	log	report
ci-qemu-upstream	2020/08/24 17:00	upstream	fffe3ae0	67b599d1	.config	log	report
ci-upstream-kasan-gce-smack-root	2020/07/24 03:38	upstream	d15be546	70c104a1	.config	log	report
ci-upstream-kasan-gce	2020/07/20 17:19	upstream	5714ee50	4285ffa3	.config	log	report
ci-upstream-kasan-gce	2020/07/03 04:11	upstream	cd77006e	bed10395	.config	log	report
ci-upstream-kasan-gce	2020/07/01 13:30	upstream	7c30b859	39acb39d	.config	log	report
ci-qemu-upstream	2020/06/05 09:23	upstream	15a2bc4d	2420d1bc	.config	log	report
ci-upstream-kasan-gce-selinux-root	2020/05/29 12:14	upstream	75caf310	d19ed305	.config	log	report
ci-upstream-kasan-gce-root	2020/05/29 12:03	upstream	75caf310	d19ed305	.config	log	report
ci-upstream-kasan-gce-smack-root	2020/04/25 07:46	upstream	b4f63322	03d97a1b	.config	log	report
ci-upstream-kasan-gce-selinux-root	2020/04/11 01:34	upstream	ab6f762f	a8c6a3f8	.config	log	report
ci-upstream-kasan-gce-root	2020/02/03 22:56	upstream	754beeec	93e5e335	.config	log	report
ci-upstream-kasan-gce-smack-root	2020/01/20 05:02	upstream	8f8972a3	0342f8c7	.config	log	report
ci-upstream-kasan-gce-root	2020/01/14 12:16	upstream	b3a987b0	32881205	.config	log	report
ci-qemu-upstream-386	2020/08/01 10:22	upstream	7dc6fd0f	d895b3be	.config	log	report
ci-upstream-kasan-gce-386	2020/07/28 12:28	upstream	92ed3019	cb93dc6a	.config	log	report
ci-qemu-upstream-386	2020/05/20 21:34	upstream	115a5416	1255f02a	.config	log	report
ci-upstream-bpf-kasan-gce	2020/12/27 20:36	bpf	a61daaf3	2242f77f	.config	log	report			info
ci-upstream-bpf-kasan-gce	2020/12/22 22:53	bpf	e7e51805	04201c06	.config	log	report			info
ci-upstream-bpf-kasan-gce	2020/09/30 03:56	bpf	9cf51446	5abc3f1a	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2021/01/12 02:23	bpf-next	e22d7f05	2c1f2513	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/12/15 14:55	bpf-next	0e12c027	97183ed7	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/12/03 11:12	bpf-next	97306be4	e6b0d314	.config	log	report			info
ci-upstream-net-kasan-gce	2020/10/08 05:33	net-next	9faebeb2	1880b4a9	.config	log	report			info
ci-upstream-net-kasan-gce	2020/09/30 08:24	net-next	28009571	5abc3f1a	.config	log	report			info
ci-upstream-net-kasan-gce	2020/09/29 02:05	net-next	bcbf1be0	1b88c6d5	.config	log	report			info
ci-upstream-net-kasan-gce	2020/09/26 13:32	net-next	6fba737a	2d5ea0cb	.config	log	report			info
ci-upstream-net-kasan-gce	2020/09/24 10:14	net-next	1a26e88d	54289b08	.config	log	report			info
ci-upstream-net-kasan-gce	2020/09/23 15:11	net-next	748d1c8a	287cd75a	.config	log	report			info
ci-upstream-net-kasan-gce	2020/09/21 03:22	net-next	3cec0369	9564d2e9	.config	log	report			info
ci-upstream-net-kasan-gce	2020/09/16 04:19	net-next	0f9ad4e7	18d7d030	.config	log	report			info
ci-upstream-net-kasan-gce	2020/09/15 09:43	net-next	ed6d9b02	6989d6f6	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/09/17 10:25	linux-next	5fa35f24	8247808b	.config	log	report			info