INFO: trying to register non-static key in l2cap_sock_teardown

INFO: trying to register non-static key in l2cap_sock_teardown_cb
Status: upstream: reported C repro on 2021/01/01 10:49
Reported-by: syzbot+a41dfef1d2e04910eb2e@syzkaller.appspotmail.com
First crash: 294d, last: 17d

Cause bisection: introduced by (bisect log) :
commit 4680a7ee5db27772af40d83393fa0fb955b745b7
Author: Miklos Szeredi <mszeredi@redhat.com>
Date: Sat Oct 1 05:32:33 2016 +0000

fuse: remove duplicate cs->offset assignment

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

similar bugs (2):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
linux-4.19	INFO: trying to register non-static key in l2cap_sock_teardown_cb				9	8d17h	250d	0/1	upstream: reported on 2021/02/10 19:25
linux-4.14	INFO: trying to register non-static key in l2cap_sock_teardown_cb				9	155d	305d	0/1	auto-closed as invalid on 2021/09/13 12:54

Sample crash report:

INFO: trying to register non-static key.
the code is fine but needs lockdep annotation.
turning off the locking correctness validator.
CPU: 0 PID: 9812 Comm: kworker/0:5 Not tainted 5.11.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events l2cap_chan_timeout
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:120
 assign_lock_key kernel/locking/lockdep.c:935 [inline]
 register_lock_class+0x1041/0x1100 kernel/locking/lockdep.c:1247
 __lock_acquire+0x101/0x54f0 kernel/locking/lockdep.c:4711
 lock_acquire kernel/locking/lockdep.c:5437 [inline]
 lock_acquire+0x29d/0x740 kernel/locking/lockdep.c:5402
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
 _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:175
 spin_lock_bh include/linux/spinlock.h:359 [inline]
 lock_sock_nested+0x3b/0x110 net/core/sock.c:3049
 l2cap_sock_teardown_cb+0xa1/0x660 net/bluetooth/l2cap_sock.c:1520
 l2cap_chan_del+0xbc/0xa80 net/bluetooth/l2cap_core.c:618
 l2cap_chan_close+0x1bc/0xaf0 net/bluetooth/l2cap_core.c:823
 l2cap_chan_timeout+0x17e/0x2f0 net/bluetooth/l2cap_core.c:436
 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
==================================================================
BUG: KASAN: use-after-free in l2cap_sock_teardown_cb+0x5c9/0x660 net/bluetooth/l2cap_sock.c:1522
Read of size 8 at addr ffff88802b6ce4c8 by task kworker/0:5/9812

CPU: 0 PID: 9812 Comm: kworker/0:5 Not tainted 5.11.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events l2cap_chan_timeout
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:120
 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:230
 __kasan_report mm/kasan/report.c:396 [inline]
 kasan_report.cold+0x79/0xd5 mm/kasan/report.c:413
 l2cap_sock_teardown_cb+0x5c9/0x660 net/bluetooth/l2cap_sock.c:1522
 l2cap_chan_del+0xbc/0xa80 net/bluetooth/l2cap_core.c:618
 l2cap_chan_close+0x1bc/0xaf0 net/bluetooth/l2cap_core.c:823
 l2cap_chan_timeout+0x17e/0x2f0 net/bluetooth/l2cap_core.c:436
 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

Allocated by task 8493:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:401 [inline]
 ____kasan_kmalloc.constprop.0+0x82/0xa0 mm/kasan/common.c:429
 kmalloc_node include/linux/slab.h:575 [inline]
 kvmalloc_node+0x61/0xf0 mm/util.c:587
 kvmalloc include/linux/mm.h:781 [inline]
 xt_alloc_table_info+0x3c/0xa0 net/netfilter/x_tables.c:1176
 do_replace net/ipv6/netfilter/ip6_tables.c:1141 [inline]
 do_ip6t_set_ctl+0x4e5/0xb70 net/ipv6/netfilter/ip6_tables.c:1636
 nf_setsockopt+0x83/0xe0 net/netfilter/nf_sockopt.c:101
 ipv6_setsockopt+0x122/0x180 net/ipv6/ipv6_sockglue.c:1008
 tcp_setsockopt+0x136/0x2440 net/ipv4/tcp.c:3597
 __sys_setsockopt+0x2db/0x610 net/socket.c:2115
 __do_sys_setsockopt net/socket.c:2126 [inline]
 __se_sys_setsockopt net/socket.c:2123 [inline]
 __x64_sys_setsockopt+0xba/0x150 net/socket.c:2123
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 8493:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:356
 ____kasan_slab_free+0xe1/0x110 mm/kasan/common.c:362
 kasan_slab_free include/linux/kasan.h:188 [inline]
 slab_free_hook mm/slub.c:1547 [inline]
 slab_free_freelist_hook+0x5d/0x150 mm/slub.c:1580
 slab_free mm/slub.c:3142 [inline]
 kfree+0xdb/0x3b0 mm/slub.c:4124
 kvfree+0x42/0x50 mm/util.c:616
 __do_replace+0x6b7/0x8c0 net/ipv6/netfilter/ip6_tables.c:1103
 do_replace net/ipv6/netfilter/ip6_tables.c:1156 [inline]
 do_ip6t_set_ctl+0x8ec/0xb70 net/ipv6/netfilter/ip6_tables.c:1636
 nf_setsockopt+0x83/0xe0 net/netfilter/nf_sockopt.c:101
 ipv6_setsockopt+0x122/0x180 net/ipv6/ipv6_sockglue.c:1008
 tcp_setsockopt+0x136/0x2440 net/ipv4/tcp.c:3597
 __sys_setsockopt+0x2db/0x610 net/socket.c:2115
 __do_sys_setsockopt net/socket.c:2126 [inline]
 __se_sys_setsockopt net/socket.c:2123 [inline]
 __x64_sys_setsockopt+0xba/0x150 net/socket.c:2123
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff88802b6ce000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1224 bytes inside of
 2048-byte region [ffff88802b6ce000, ffff88802b6ce800)
The buggy address belongs to the page:
page:0000000055ddf779 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2b6c8
head:0000000055ddf779 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head)
raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888010042000
raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88802b6ce380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88802b6ce400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88802b6ce480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                              ^
 ffff88802b6ce500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88802b6ce580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Crashes (85):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci-upstream-net-kasan-gce	2021/01/10 21:39	net-next	73b7a6047971	2c1f2513	.config	log	report	syz	C
ci-upstream-kasan-gce-root	2021/09/29 14:51	upstream	a4e6f95a891a	be530f6c	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-kasan-gce-root	2021/09/18 12:50	upstream	4357f03d6611	70b76c1d	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-kasan-gce-selinux-root	2021/08/22 19:53	upstream	1bdc3d5be7e1	b599f2fc	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-kasan-gce-selinux-root	2021/07/20 13:47	upstream	2734d6c1b1a0	bc48c9ab	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-kasan-gce-selinux-root	2021/06/08 10:30	upstream	614124bea77e	b718257f	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-qemu-upstream	2021/06/04 20:15	upstream	16f0596fc1d7	966a236b	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-qemu-upstream	2021/06/02 09:01	upstream	231bc5390667	0740de69	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-qemu-upstream	2021/06/02 05:24	upstream	231bc5390667	032639db	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-qemu-upstream	2021/05/12 08:08	upstream	88b06399c9c7	86294427	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-kasan-gce-selinux-root	2021/04/29 06:38	upstream	d72cd4ad4174	77e2b668	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-kasan-gce-selinux-root	2021/04/09 20:24	upstream	17e7124aad76	6a81331a	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-kasan-gce-selinux-root	2021/03/23 23:00	upstream	7acac4b3196c	e613994b	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-kasan-gce-selinux-root	2021/03/22 19:28	upstream	0d02ec6b3136	8092f30d	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-kasan-gce-smack-root	2021/03/21 08:28	upstream	812da4d39463	17810eae	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-kasan-gce-smack-root	2021/03/17 22:12	upstream	1df27313f50a	fdb2bb2c	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-qemu-upstream	2021/03/01 10:30	upstream	fe07bfda2fb9	4c37c133	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-kasan-gce-root	2021/02/24 08:32	upstream	c03c21ba6f4e	fcc6d71b	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-qemu-upstream-386	2021/04/16 18:49	upstream	2f7b98d1e55c	7e2b734b	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-qemu-upstream-386	2021/04/13 10:00	upstream	89698becf06d	bfeda1b1	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-this-kasan-gce	2021/09/22 08:55	net	b3f98404bd62	169724fe	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-this-kasan-gce	2021/06/26 21:38	net	d6765985a42a	9d2ab5df	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-this-kasan-gce	2021/06/05 03:58	net	3822d0670c9d	500c2339	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-this-kasan-gce	2021/05/21 13:19	net	5cb4a593821f	3c7fef33	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-this-kasan-gce	2021/04/21 15:13	net	d83b8aa5207d	95777977	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-this-kasan-gce	2021/03/27 23:05	net	75887e881b19	a8529b82	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/10/01 07:19	net-next	69508d43334e	1d849ab4	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/09/17 06:47	net-next	561bed688bff	5b989942	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/09/17 05:04	net-next	561bed688bff	5b989942	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/09/16 00:35	net-next	5706383b30cf	07e953c1	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/09/10 09:43	net-next	626bf91a292e	5ae8508a	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/08/08 07:01	net-next	f9be84db09d2	6972b106	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/07/19 09:53	net-next	0d6835ffe50c	e6a17580	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/07/19 01:18	net-next	0d6835ffe50c	f115ae98	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/05/29 07:46	net-next	38e9673ce08f	858ea628	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/05/23 08:31	net-next	f5120f599880	3c7fef33	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/05/16 13:06	net-next	77091933e453	f54a5c09	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/05/15 14:36	net-next	77091933e453	93f844de	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/05/15 12:11	net-next	77091933e453	93f844de	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/05/03 19:53	net-next	95aafe911db6	ad61f371	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/04/30 18:31	net-next	95aafe911db6	77e2b668	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/04/12 01:19	net-next	cbd312539284	bfeda1b1	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/04/06 03:06	net-next	514e1150da9c	6a81331a	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/04/05 08:31	net-next	7d42e84eb99d	6a81331a	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/04/04 20:44	net-next	7d42e84eb99d	6a81331a	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/04/04 12:12	net-next	428e68e1a85a	6a81331a	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/03/16 16:56	net-next	0f13b5e6bf28	fdb2bb2c	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/03/14 05:05	net-next	ebc71a380435	4a003785	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/03/02 10:59	net-next	d310ec03a34e	92ead296	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/03/02 09:59	net-next	d310ec03a34e	183afb6c	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/03/02 06:48	net-next	d310ec03a34e	183afb6c	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/02/27 01:04	net-next	d310ec03a34e	4c37c133	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/02/26 00:57	net-next	d310ec03a34e	76f7fc95	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/01/30 10:48	net-next	14e8e0f60088	fc9fd31e	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-linux-next-kasan-gce-root	2021/01/31 19:05	linux-next	b01f250d83f6	fc9fd31e	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-kasan-gce-root	2021/01/16 11:31	upstream	1d94330a437a	65a7a854	.config	log	report			info
ci-qemu-upstream	2021/01/12 02:15	upstream	a0d54b4f5b21	2c1f2513	.config	log	report			info
ci-qemu-upstream-386	2021/01/06 02:36	upstream	6207214a70bf	b1c228e1	.config	log	report			info
ci-upstream-net-kasan-gce	2021/01/16 17:21	net-next	9ab7e76aefc9	65a7a854	.config	log	report			info
ci-upstream-net-kasan-gce	2021/01/12 15:13	net-next	c73a45965dd5	2c1f2513	.config	log	report			info
ci-upstream-net-kasan-gce	2021/01/11 12:49	net-next	73b7a6047971	2c1f2513	.config	log	report			info
ci-upstream-net-kasan-gce	2021/01/11 00:11	net-next	73b7a6047971	2c1f2513	.config	log	report			info
ci-upstream-net-kasan-gce	2021/01/09 09:01	net-next	833d22f2f922	c104d4a3	.config	log	report			info
ci-upstream-net-kasan-gce	2020/12/28 10:39	net-next	3db1a3fa9880	2242f77f	.config	log	report			info