INFO: task hung in register_netdevice

INFO: task hung in register_netdevice_notifier (2)
Status: upstream: reported syz repro on 2019/10/23 07:25
Reported-by: syzbot+355f8edb2ff45d5f95fa@syzkaller.appspotmail.com
First crash: 1046d, last: 9h56m

Cause bisection: introduced by (bisect log) :
commit 6bf071bf09d4b2ff3ee8783531e2ce814f0870cb
Author: Jesper Dangaard Brouer <brouer@redhat.com>
Date: Tue Jun 18 13:05:27 2019 +0000

xdp: page_pool related fix to cpumap

Crash: general protection fault in batadv_iv_ogm_queue_add (log)
Repro: syz .config

similar bugs (3):
Kernel	Title	Count	Last	Reported	Patched	Status
linux-4.19	INFO: task hung in register_netdevice_notifier	64	23d	781d	0/1	upstream: reported on 2019/04/27 04:10
upstream	INFO: task hung in register_netdevice_notifier	602	1160d	1172d	0/22	closed as invalid on 2018/05/03 10:15
upstream	INFO: task can't die in register_netdevice_notifier	91	3d09h	288d	0/22	upstream: reported on 2020/09/01 19:50

Patch testing requests:
Created	Duration	User	Patch	Repo	Result
2021/06/05 00:53	17m	penguin-kernel@i-love.sakura.ne.jp	patch	upstream	OK
2021/06/02 14:53	17m	penguin-kernel@i-love.sakura.ne.jp	patch	upstream	OK
2021/06/02 11:11	16m	penguin-kernel@i-love.sakura.ne.jp	patch	upstream	OK
2021/06/01 13:45	16m	penguin-kernel@i-love.sakura.ne.jp	patch	upstream	report log

Sample crash report:

INFO: task syz-executor.0:16395 blocked for more than 143 seconds.
      Not tainted 5.13.0-rc3-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:25952 pid:16395 ppid: 16156 flags:0x00004004
Call Trace:
 context_switch kernel/sched/core.c:4339 [inline]
 __schedule+0x916/0x23e0 kernel/sched/core.c:5147
 schedule+0xcf/0x270 kernel/sched/core.c:5226
 rwsem_down_write_slowpath+0x7e5/0x1200 kernel/locking/rwsem.c:1106
 __down_write_common kernel/locking/rwsem.c:1261 [inline]
 __down_write_common kernel/locking/rwsem.c:1258 [inline]
 __down_write kernel/locking/rwsem.c:1270 [inline]
 down_write+0x137/0x150 kernel/locking/rwsem.c:1407
 register_netdevice_notifier+0x1e/0x260 net/core/dev.c:1902
 bcm_init+0x1a3/0x210 net/can/bcm.c:1451
 can_create+0x27c/0x4d0 net/can/af_can.c:168
 __sock_create+0x3de/0x780 net/socket.c:1408
 sock_create net/socket.c:1459 [inline]
 __sys_socket+0xef/0x200 net/socket.c:1501
 __do_sys_socket net/socket.c:1510 [inline]
 __se_sys_socket net/socket.c:1508 [inline]
 __x64_sys_socket+0x6f/0xb0 net/socket.c:1508
 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665d9
RSP: 002b:00007f7e1ffa7188 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9
RDX: 0000000000000002 RSI: 0000000000000002 RDI: 000000000000001d
RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffc744b4b1f R14: 00007f7e1ffa7300 R15: 0000000000022000
INFO: task syz-executor.0:16400 blocked for more than 143 seconds.
      Not tainted 5.13.0-rc3-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:29408 pid:16400 ppid: 16156 flags:0x00000004
Call Trace:
 context_switch kernel/sched/core.c:4339 [inline]
 __schedule+0x916/0x23e0 kernel/sched/core.c:5147
 schedule+0xcf/0x270 kernel/sched/core.c:5226
 rwsem_down_write_slowpath+0x7e5/0x1200 kernel/locking/rwsem.c:1106
 __down_write_common kernel/locking/rwsem.c:1261 [inline]
 __down_write_common kernel/locking/rwsem.c:1258 [inline]
 __down_write kernel/locking/rwsem.c:1270 [inline]
 down_write+0x137/0x150 kernel/locking/rwsem.c:1407
 register_netdevice_notifier+0x1e/0x260 net/core/dev.c:1902
 bcm_init+0x1a3/0x210 net/can/bcm.c:1451
 can_create+0x27c/0x4d0 net/can/af_can.c:168
 __sock_create+0x3de/0x780 net/socket.c:1408
 sock_create net/socket.c:1459 [inline]
 __sys_socket+0xef/0x200 net/socket.c:1501
 __do_sys_socket net/socket.c:1510 [inline]
 __se_sys_socket net/socket.c:1508 [inline]
 __x64_sys_socket+0x6f/0xb0 net/socket.c:1508
 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665d9
RSP: 002b:00007f7e1ff44188 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 000000000056c1a8 RCX: 00000000004665d9
RDX: 0000000000000002 RSI: 0000000000000002 RDI: 000000000000001d
RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c1a8
R13: 00007ffc744b4b1f R14: 00007f7e1ff44300 R15: 0000000000022000

Showing all locks held in the system:
1 lock held by khungtaskd/1627:
 #0: ffffffff8bf79320 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6333
1 lock held by in:imklog/8277:
 #0: ffff888030e12870 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:974
3 locks held by kworker/u4:2/14373:
1 lock held by syz-executor.0/16395:
 #0: ffffffff8d691f10 (pernet_ops_rwsem){++++}-{3:3}, at: register_netdevice_notifier+0x1e/0x260 net/core/dev.c:1902
1 lock held by syz-executor.0/16400:
 #0: ffffffff8d691f10 (pernet_ops_rwsem){++++}-{3:3}, at: register_netdevice_notifier+0x1e/0x260 net/core/dev.c:1902

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 1627 Comm: khungtaskd Not tainted 5.13.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x141/0x1d7 lib/dump_stack.c:120
 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline]
 watchdog+0xd48/0xfb0 kernel/hung_task.c:294
 kthread+0x3b1/0x4a0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 14373 Comm: kworker/u4:2 Not tainted 5.13.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
RIP: 0010:__sanitizer_cov_trace_pc+0x37/0x60 kernel/kcov.c:197
Code: 81 e1 00 01 00 00 65 48 8b 14 25 00 f0 01 00 a9 00 01 ff 00 74 0e 85 c9 74 35 8b 82 3c 15 00 00 85 c0 74 2b 8b 82 18 15 00 00 <83> f8 02 75 20 48 8b 8a 20 15 00 00 8b 92 1c 15 00 00 48 8b 01 48
RSP: 0018:ffffc900019afb58 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000200 RCX: 0000000000000000
RDX: ffff8880286d9c40 RSI: ffffffff8145d523 RDI: 0000000000000003
RBP: ffffffff874d2c23 R08: 0000000000000000 R09: ffffffff8bc703c3
R10: ffffffff817ae39d R11: 0000000000000000 R12: ffffffff8bc703c0
R13: 000000000000dee5 R14: 0000000000000000 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005622c9273cd8 CR3: 00000000137ea000 CR4: 0000000000350ee0
Call Trace:
 __local_bh_enable_ip+0xc3/0x120 kernel/softirq.c:366
 local_bh_enable include/linux/bottom_half.h:32 [inline]
 get_next_corpse net/netfilter/nf_conntrack_core.c:2237 [inline]
 nf_ct_iterate_cleanup+0x15a/0x450 net/netfilter/nf_conntrack_core.c:2260
 nf_conntrack_cleanup_net_list+0x184/0x4f0 net/netfilter/nf_conntrack_core.c:2454
 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:178
 cleanup_net+0x4ea/0xb10 net/core/net_namespace.c:595
 process_one_work+0x98d/0x1600 kernel/workqueue.c:2276
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2422
 kthread+0x3b1/0x4a0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Crashes (10549):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	VM info	Title
ci-upstream-kasan-gce-root	2021/05/27 08:24	upstream	7ac3a1c1	858ea628	.config	log	report	syz		INFO: task hung in register_netdevice_notifier
ci-upstream-kasan-gce-smack-root	2021/06/16 10:26	upstream	94f0b2d4	990d3cbe	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-kasan-gce-smack-root	2021/06/15 13:00	upstream	009c9aa5	58636922	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-kasan-gce-smack-root	2021/06/14 12:18	upstream	009c9aa5	1ba81399	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-kasan-gce-smack-root	2021/06/13 04:43	upstream	8ecfa36c	1ba81399	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-kasan-gce-selinux-root	2021/06/12 15:30	upstream	ad347abe	1ba81399	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-kasan-gce-smack-root	2021/06/11 12:17	upstream	06af8679	1ba81399	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-kasan-gce-selinux-root	2021/06/11 10:52	upstream	06af8679	1ba81399	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-kasan-gce-selinux-root	2021/06/10 03:25	upstream	cd1245d7	1ba81399	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-kasan-gce-root	2021/06/09 16:40	upstream	368094df	84fe5d96	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-kasan-gce	2021/06/09 11:53	upstream	368094df	5c2fe346	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-kasan-gce-smack-root	2021/06/08 21:38	upstream	4c8684fe	b718257f	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-kasan-gce-root	2021/06/05 19:01	upstream	e5220dd1	500c2339	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-kasan-gce-selinux-root	2021/06/05 17:10	upstream	9d32fa5d	500c2339	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-kasan-gce-smack-root	2021/06/05 00:16	upstream	16f0596f	966a236b	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-kasan-gce-root	2021/06/04 14:31	upstream	f88cd3fb	966a236b	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-kasan-gce	2021/06/04 10:41	upstream	f88cd3fb	0740de69	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-kasan-gce-selinux-root	2021/06/03 02:57	upstream	324c92e5	0740de69	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-kasan-gce-smack-root	2021/06/02 05:07	upstream	231bc539	032639db	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-kasan-gce-smack-root	2021/06/01 00:04	upstream	c2131f7e	032639db	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-kasan-gce-smack-root	2021/05/31 22:50	upstream	c2131f7e	032639db	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-kasan-gce-selinux-root	2021/05/31 14:59	upstream	8124c8a6	032639db	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-kasan-gce-root	2021/05/31 13:26	upstream	8124c8a6	032639db	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-kasan-gce-root	2021/05/31 05:04	upstream	8124c8a6	325a8dab	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-kasan-gce-root	2021/05/30 16:32	upstream	b90e90f4	325a8dab	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-kasan-gce-smack-root	2021/05/30 14:53	upstream	b90e90f4	325a8dab	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-kasan-gce-root	2021/05/29 19:19	upstream	6799d4f2	325a8dab	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-kasan-gce-selinux-root	2021/05/29 00:11	upstream	5ff2756a	858ea628	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-kasan-gce-selinux-root	2021/05/27 14:47	upstream	d7c5303f	858ea628	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-kasan-gce-selinux-root	2021/05/27 01:45	upstream	7ac3a1c1	858ea628	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-kasan-gce-386	2021/05/06 13:42	upstream	d2b6f8a1	06c27ff5	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-net-this-kasan-gce	2021/06/13 21:47	net	f4cdcae0	1ba81399	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-bpf-kasan-gce	2021/06/13 17:11	bpf	11fc79fc	1ba81399	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-net-this-kasan-gce	2021/06/06 10:14	net	3822d067	500c2339	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-net-this-kasan-gce	2021/06/04 00:19	net	261ba78c	0740de69	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-net-kasan-gce	2021/06/15 10:58	net-next	89212e16	58636922	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-net-kasan-gce	2021/06/15 09:13	net-next	2d7ff2d8	1ba81399	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-net-kasan-gce	2021/06/12 20:59	net-next	02b0bb51	1ba81399	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-net-kasan-gce	2021/06/12 12:33	net-next	1f1aa3fe	1ba81399	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-net-kasan-gce	2021/06/12 00:35	net-next	1f1aa3fe	1ba81399	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-net-kasan-gce	2021/06/11 18:53	net-next	76cf404c	1ba81399	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-net-kasan-gce	2021/06/08 06:24	net-next	dc8cf755	b718257f	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-net-kasan-gce	2021/06/07 22:05	net-next	1a42624a	e59537be	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-net-kasan-gce	2021/06/07 12:12	net-next	1a42624a	e59537be	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-net-kasan-gce	2021/06/07 07:25	net-next	1a42624a	500c2339	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-net-kasan-gce	2021/06/05 04:34	net-next	1a42624a	500c2339	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-net-kasan-gce	2021/06/03 14:06	net-next	270d47dc	0740de69	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-net-kasan-gce	2021/06/02 11:59	net-next	5fe8e519	0740de69	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-net-kasan-gce	2021/06/01 06:26	net-next	e099f3e8	032639db	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-net-kasan-gce	2021/05/31 02:06	net-next	d3f2c48d	325a8dab	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-net-kasan-gce	2021/05/30 02:33	net-next	015dbf56	325a8dab	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-net-kasan-gce	2021/05/29 06:40	net-next	38e9673c	858ea628	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-net-kasan-gce	2021/05/28 18:59	net-next	af9207ad	858ea628	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-net-kasan-gce	2021/05/28 13:26	net-next	af9207ad	858ea628	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-bpf-next-kasan-gce	2021/05/22 08:13	bpf-next	a49e72b3	3c7fef33	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-linux-next-kasan-gce-root	2021/05/05 13:52	linux-next	29955e02	06c27ff5	.config	log	report		info	INFO: task hung in register_netdevice_notifier
ci-upstream-kasan-gce-root	2021/01/17 03:22	upstream	0da0a8a0	65a7a854	.config	log	report		info
ci-upstream-kasan-gce-root	2019/10/22 21:33	upstream	3b7c59a1	5681358a	.config	log	report
ci-upstream-linux-next-kasan-gce-root	2018/08/05 01:50	linux-next	116b181b	3476a2df	.config	log	report