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: 181d, last: 8d01h

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	236d	642d	16/17	fixed on 2019/12/13 00:31
upstream	BUG: workqueue lockup (2)	C	406	792d	950d	6/17	fixed on 2018/05/13 10:02
linux-4.14	BUG: workqueue lockup	C	42	22h48m	438d	0/1	upstream: reported C repro on 2019/04/29 11:26
upstream	BUG: workqueue lockup	C	172	973d	983d	3/17	fixed on 2017/11/11 01:37
upstream	BUG: workqueue lockup (3)	C	1215	736d	789d	9/17	fixed on 2018/07/09 18:05
android-414	BUG: workqueue lockup	C	114	301d	457d	0/1	public: reported C repro on 2019/04/11 00:00
linux-4.19	BUG: workqueue lockup	C	15	5d10h	445d	0/1	upstream: reported C repro on 2019/04/22 20:37
android-49	BUG: workqueue lockup	C	69	225d	456d	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

Crashes (35):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	Maintainers
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	axboe@kernel.dk, io-uring@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
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	linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, steffen.klassert@secunet.com
ci-upstream-kasan-gce-selinux-root	2020/03/18 10:52	upstream	ac309e77	97bc55ce	.config	log	report	syz	C	linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, steffen.klassert@secunet.com
ci-upstream-kasan-gce-root	2020/03/15 15:46	upstream	d3dca690	749688d2	.config	log	report	syz	C	linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, steffen.klassert@secunet.com
ci-upstream-kasan-gce-smack-root	2020/03/15 02:29	upstream	69a4d0ba	749688d2	.config	log	report	syz	C	linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, steffen.klassert@secunet.com
ci-upstream-kasan-gce-selinux-root	2020/03/09 04:58	upstream	61a09258	2e9971bb	.config	log	report	syz	C	linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, steffen.klassert@secunet.com
ci-upstream-kasan-gce-selinux-root	2020/03/08 11:08	upstream	c2003765	2e9971bb	.config	log	report	syz	C	linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, steffen.klassert@secunet.com
ci-upstream-kasan-gce-smack-root	2020/03/04 12:59	upstream	63623fd4	c88c7b75	.config	log	report	syz	C	linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, steffen.klassert@secunet.com
ci-upstream-kasan-gce-selinux-root	2020/02/16 00:48	upstream	829e6944	5d7b90f1	.config	log	report	syz	C	linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, steffen.klassert@secunet.com
ci-upstream-kasan-gce-smack-root	2020/02/13 10:03	upstream	f2850dd5	84f4fc8a	.config	log	report	syz	C	linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, steffen.klassert@secunet.com
ci-upstream-kasan-gce	2020/02/13 06:50	upstream	f2850dd5	84f4fc8a	.config	log	report	syz	C	linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, steffen.klassert@secunet.com
ci-upstream-kasan-gce	2020/02/09 19:08	upstream	fdfa3a67	6ece2ea5	.config	log	report	syz	C	linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, steffen.klassert@secunet.com
ci-upstream-kasan-gce-root	2020/01/11 06:19	upstream	e69ec487	4de4e9f0	.config	log	report	syz	C	linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, steffen.klassert@secunet.com
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	linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, steffen.klassert@secunet.com
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-upstream-kasan-gce	2020/07/03 04:11	upstream	cd77006e	bed10395	.config	log	report			linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, steffen.klassert@secunet.com
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			linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, steffen.klassert@secunet.com
ci-upstream-kasan-gce-selinux-root	2020/05/29 12:14	upstream	75caf310	d19ed305	.config	log	report			linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, steffen.klassert@secunet.com
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			linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, steffen.klassert@secunet.com
ci-upstream-kasan-gce-selinux-root	2020/04/11 01:34	upstream	ab6f762f	a8c6a3f8	.config	log	report			linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, steffen.klassert@secunet.com
ci-upstream-kasan-gce-root	2020/02/03 22:56	upstream	754beeec	93e5e335	.config	log	report			linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, steffen.klassert@secunet.com
ci-upstream-kasan-gce-smack-root	2020/01/20 05:02	upstream	8f8972a3	0342f8c7	.config	log	report			linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, steffen.klassert@secunet.com
ci-upstream-kasan-gce-root	2020/01/14 12:16	upstream	b3a987b0	32881205	.config	log	report			linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, steffen.klassert@secunet.com
ci-qemu-upstream-386	2020/05/20 21:34	upstream	115a5416	1255f02a	.config	log	report