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: 107d, last: 1d21h

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				3	21d	63d	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				6	15d	118d	0/1	upstream: reported on 2020/12/17 13:00

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 (53):
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	73b7a604	2c1f2513	.config	log	report	syz	C
ci-upstream-kasan-gce-selinux-root	2021/04/09 20:24	upstream	17e7124a	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	7acac4b3	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	0d02ec6b	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	812da4d3	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	1df27313	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	fe07bfda	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	c03c21ba	fcc6d71b	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-kasan-gce-selinux-root	2021/02/22 00:44	upstream	55f62bc8	a659b3f1	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-kasan-gce-root	2021/02/21 20:17	upstream	55f62bc8	a659b3f1	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-kasan-gce-selinux-root	2021/02/21 19:16	upstream	55f62bc8	a659b3f1	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-kasan-gce-root	2021/02/21 04:36	upstream	e767b353	3e5ed8b4	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-kasan-gce-selinux-root	2021/02/19 18:48	upstream	f40ddce8	f689d40a	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-qemu-upstream	2021/02/14 10:33	upstream	358fecee	98682e5e	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-kasan-gce-smack-root	2021/02/12 12:12	upstream	dcc0b490	a5f86b15	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-kasan-gce-selinux-root	2021/01/31 11:04	upstream	8c947645	fc9fd31e	.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	89698bec	bfeda1b1	.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	75887e88	a8529b82	.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	cbd31253	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	514e1150	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	7d42e84e	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	7d42e84e	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	428e68e1	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	0f13b5e6	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	ebc71a38	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	d310ec03	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	d310ec03	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	d310ec03	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	d310ec03	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	d310ec03	76f7fc95	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/02/22 03:06	net-next	d310ec03	a659b3f1	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/02/18 09:39	net-next	38b5133a	14052202	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/02/17 15:00	net-next	d489ded1	052f8d9f	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/02/11 02:56	net-next	dc9d8758	a52ee10a	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/02/09 01:10	net-next	8e571586	2bd9619f	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/02/04 15:37	net-next	32d1bbb1	42b90a7c	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/02/03 22:35	net-next	32d1bbb1	624dad51	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/02/03 13:36	net-next	32d1bbb1	624dad51	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/02/02 11:23	net-next	1a2b60f6	19e09687	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/02/02 08:58	net-next	1a2b60f6	19e09687	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/02/02 08:43	net-next	1a2b60f6	19e09687	.config	log	report			info	INFO: trying to register non-static key in l2cap_sock_teardown_cb
ci-upstream-net-kasan-gce	2021/02/02 06:32	net-next	1a2b60f6	e6b95f32	.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	14e8e0f6	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	b01f250d	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	1d94330a	65a7a854	.config	log	report			info
ci-qemu-upstream	2021/01/12 02:15	upstream	a0d54b4f	2c1f2513	.config	log	report			info
ci-qemu-upstream-386	2021/01/06 02:36	upstream	6207214a	b1c228e1	.config	log	report			info
ci-upstream-net-kasan-gce	2021/01/16 17:21	net-next	9ab7e76a	65a7a854	.config	log	report			info
ci-upstream-net-kasan-gce	2021/01/12 15:13	net-next	c73a4596	2c1f2513	.config	log	report			info
ci-upstream-net-kasan-gce	2021/01/11 12:49	net-next	73b7a604	2c1f2513	.config	log	report			info
ci-upstream-net-kasan-gce	2021/01/11 00:11	net-next	73b7a604	2c1f2513	.config	log	report			info
ci-upstream-net-kasan-gce	2021/01/09 09:01	net-next	833d22f2	c104d4a3	.config	log	report			info
ci-upstream-net-kasan-gce	2020/12/28 10:39	net-next	3db1a3fa	2242f77f	.config	log	report			info