INFO: trying to register non-static key in l2cap_chan

INFO: trying to register non-static key in l2cap_chan_del
Status: fixed on 2021/11/10 00:50
Reported-by: syzbot+abfc0f5e668d4099af73@syzkaller.appspotmail.com
Fix commit: 3af70b39fa2d Bluetooth: check for zapped sk before connecting
First crash: 539d, last: 320d

Cause bisection: the issue happens on the oldest tested release (bisect log)
Crash: KASAN: use-after-free Read in lock_sock_nested (log)
Repro: syz .config

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
linux-4.19	INFO: trying to register non-static key in l2cap_chan_del				3	430d	438d	0/1	auto-closed as invalid on 2021/03/22 10:27

Patch testing requests:
Created	Duration	User	Patch	Repo	Result
2020/08/28 16:31	9m	coiby.xu@gmail.com		https://github.com/coiby/linux.git syzbot8_test1	report log
2020/08/28 16:25	0m	coiby.xu@gmail.com	patch	git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git fb893de323e2d39f7a1f6df425703a2edbdf56ea	error
2020/08/28 16:16	0m	coiby.xu@gmail.com	patch	git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git fb893de323e2d39f7a1f6df425703a2edbdf56ea	error

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: 6821 Comm: kworker/0:0 Not tainted 5.8.0-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:77 [inline]
 dump_stack+0x1f0/0x31e lib/dump_stack.c:118
 register_lock_class+0xf06/0x1520 kernel/locking/lockdep.c:893
 __lock_acquire+0xfa/0x2ab0 kernel/locking/lockdep.c:4305
 lock_acquire+0x160/0x730 kernel/locking/lockdep.c:5005
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
 _raw_spin_lock_bh+0x31/0x40 kernel/locking/spinlock.c:175
 spin_lock_bh include/linux/spinlock.h:359 [inline]
 lock_sock_nested+0x43/0x110 net/core/sock.c:3048
 l2cap_sock_teardown_cb+0x72/0x3e0 net/bluetooth/l2cap_sock.c:1520
 l2cap_chan_del+0xa3/0x760 net/bluetooth/l2cap_core.c:618
 l2cap_chan_close+0x7bf/0xae0 net/bluetooth/l2cap_core.c:823
 l2cap_chan_timeout+0x125/0x1e0 net/bluetooth/l2cap_core.c:436
 process_one_work+0x789/0xfc0 kernel/workqueue.c:2269
 worker_thread+0xaa4/0x1460 kernel/workqueue.c:2415
 kthread+0x37e/0x3a0 drivers/block/aoe/aoecmd.c:1234
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
==================================================================
BUG: KASAN: use-after-free in instrument_atomic_read include/linux/instrumented.h:56 [inline]
BUG: KASAN: use-after-free in atomic_read include/asm-generic/atomic-instrumented.h:27 [inline]
BUG: KASAN: use-after-free in pv_hybrid_queued_unfair_trylock kernel/locking/qspinlock_paravirt.h:88 [inline]
BUG: KASAN: use-after-free in __pv_queued_spin_lock_slowpath+0x19d/0xc00 kernel/locking/qspinlock.c:443
Read of size 4 at addr ffff88809b2b9088 by task kworker/0:0/6821

CPU: 0 PID: 6821 Comm: kworker/0:0 Not tainted 5.8.0-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:77 [inline]
 dump_stack+0x1f0/0x31e lib/dump_stack.c:118
 print_address_description+0x66/0x620 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report+0x132/0x1d0 mm/kasan/report.c:530
 check_memory_region_inline mm/kasan/generic.c:183 [inline]
 check_memory_region+0x2b5/0x2f0 mm/kasan/generic.c:192
 instrument_atomic_read include/linux/instrumented.h:56 [inline]
 atomic_read include/asm-generic/atomic-instrumented.h:27 [inline]
 pv_hybrid_queued_unfair_trylock kernel/locking/qspinlock_paravirt.h:88 [inline]
 __pv_queued_spin_lock_slowpath+0x19d/0xc00 kernel/locking/qspinlock.c:443
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:656 [inline]
 queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:85 [inline]
 do_raw_spin_lock+0x5bf/0x800 kernel/locking/spinlock_debug.c:113
 spin_lock_bh include/linux/spinlock.h:359 [inline]
 lock_sock_nested+0x43/0x110 net/core/sock.c:3048
 l2cap_sock_teardown_cb+0x72/0x3e0 net/bluetooth/l2cap_sock.c:1520
 l2cap_chan_del+0xa3/0x760 net/bluetooth/l2cap_core.c:618
 l2cap_chan_close+0x7bf/0xae0 net/bluetooth/l2cap_core.c:823
 l2cap_chan_timeout+0x125/0x1e0 net/bluetooth/l2cap_core.c:436
 process_one_work+0x789/0xfc0 kernel/workqueue.c:2269
 worker_thread+0xaa4/0x1460 kernel/workqueue.c:2415
 kthread+0x37e/0x3a0 drivers/block/aoe/aoecmd.c:1234
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Allocated by task 7587:
 kasan_save_stack mm/kasan/common.c:48 [inline]
 kasan_set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc+0x100/0x130 mm/kasan/common.c:461
 kmem_cache_alloc_trace+0x1f6/0x2f0 mm/slab.c:3550
 kmalloc include/linux/slab.h:554 [inline]
 kzalloc include/linux/slab.h:666 [inline]
 l2cap_chan_create+0x4c/0x320 net/bluetooth/l2cap_core.c:450
 l2cap_sock_alloc+0x136/0x1d0 net/bluetooth/l2cap_sock.c:1805
 l2cap_sock_create+0x11f/0x550 net/bluetooth/l2cap_sock.c:1836
 bt_sock_create+0x15b/0x220 net/bluetooth/af_bluetooth.c:130
 __sock_create+0x5b3/0x8c0 net/socket.c:1427
 sock_create net/socket.c:1478 [inline]
 __sys_socket+0xde/0x2d0 net/socket.c:1520
 __do_sys_socket net/socket.c:1529 [inline]
 __se_sys_socket net/socket.c:1527 [inline]
 __x64_sys_socket+0x76/0x80 net/socket.c:1527
 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 7587:
 kasan_save_stack mm/kasan/common.c:48 [inline]
 kasan_set_track+0x3d/0x70 mm/kasan/common.c:56
 kasan_set_free_info+0x17/0x30 mm/kasan/generic.c:355
 __kasan_slab_free+0xdd/0x110 mm/kasan/common.c:422
 __cache_free mm/slab.c:3418 [inline]
 kfree+0x10a/0x220 mm/slab.c:3756
 l2cap_sock_release+0x154/0x190 net/bluetooth/l2cap_sock.c:1392
 __sock_release net/socket.c:596 [inline]
 sock_close+0xd8/0x260 net/socket.c:1277
 __fput+0x34f/0x7b0 fs/file_table.c:281
 task_work_run+0x137/0x1c0 kernel/task_work.c:135
 get_signal+0x15ab/0x1d30 kernel/signal.c:2547
 arch_do_signal+0x33/0x610 arch/x86/kernel/signal.c:811
 exit_to_user_mode_loop kernel/entry/common.c:135 [inline]
 exit_to_user_mode_prepare+0x8d/0x1c0 kernel/entry/common.c:166
 syscall_exit_to_user_mode+0x5e/0x1a0 kernel/entry/common.c:241
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff88809b2b9000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 136 bytes inside of
 2048-byte region [ffff88809b2b9000, ffff88809b2b9800)
The buggy address belongs to the page:
page:000000009376a887 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x9b2b9
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea000269d408 ffffea00027df348 ffff8880aa440800
raw: 0000000000000000 ffff88809b2b9000 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809b2b8f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88809b2b9000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88809b2b9080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                      ^
 ffff88809b2b9100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88809b2b9180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Fix bisection attempts:
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci-upstream-kasan-gce-smack-root	2021/03/12 03:23	upstream	f78d76e72a46	bc15f7db	.config	log	report	syz
ci-upstream-kasan-gce-smack-root	2021/01/13 17:37	upstream	e609571b5ffa	bc15f7db	.config	log	report	syz

Crashes (73):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	VM info
ci-upstream-kasan-gce-smack-root	2020/08/13 07:48	upstream	fb893de323e2	bc15f7db	.config	log	report	syz
ci-upstream-kasan-gce-smack-root	2020/08/07 12:24	upstream	d6efb3ac3e6c	cb436c69	.config	log	report	syz
ci-upstream-net-this-kasan-gce	2020/10/04 20:34	net	1f7e877c2051	5ef9c291	.config	log	report	syz
ci-upstream-net-this-kasan-gce	2020/08/10 05:21	net	7c7ab580db49	70301872	.config	log	report	syz
ci-upstream-net-kasan-gce	2020/08/05 18:08	net-next	4c900a6b4e05	b7129355	.config	log	report	syz
ci-upstream-kasan-gce-selinux-root	2020/12/14 15:04	upstream	2c85ebc57b3e	97183ed7	.config	log	report		info
ci-upstream-kasan-gce-selinux-root	2020/12/14 13:49	upstream	2c85ebc57b3e	b22a7ec3	.config	log	report		info
ci-qemu-upstream	2020/09/12 11:36	upstream	729e3d091984	21d289c2	.config	log	report
ci-qemu-upstream	2020/09/09 06:29	upstream	fffe3ae0ee84	0ea7a887	.config	log	report
ci-upstream-kasan-gce-root	2020/09/02 08:00	upstream	b765a32a2e91	abf9ba4f	.config	log	report
ci-upstream-kasan-gce-smack-root	2020/09/01 07:48	upstream	b51594df17d0	d5a3ae1f	.config	log	report
ci-upstream-kasan-gce-root	2020/08/19 00:58	upstream	18445bf405cb	e1c29030	.config	log	report
ci-upstream-kasan-gce-selinux-root	2020/08/05 15:22	upstream	442489c21923	b7129355	.config	log	report
ci-upstream-net-this-kasan-gce	2020/11/26 23:48	net	cbf3d60329c4	1d2b823e	.config	log	report		info
ci-upstream-net-this-kasan-gce	2020/11/07 08:46	net	bf3e76289cd2	64069d48	.config	log	report		info
ci-upstream-net-this-kasan-gce	2020/10/12 07:17	net	874fb9e2ca94	4a77ae0b	.config	log	report		info
ci-upstream-net-this-kasan-gce	2020/09/09 19:27	net	843d926b003e	0ea7a887	.config	log	report
ci-upstream-net-this-kasan-gce	2020/09/09 02:35	net	19162fd4063a	abf9ba4f	.config	log	report
ci-upstream-net-this-kasan-gce	2020/09/06 14:54	net	94cc242a067a	abf9ba4f	.config	log	report
ci-upstream-net-this-kasan-gce	2020/09/01 12:02	net	bb8872a1e6bc	d5a3ae1f	.config	log	report
ci-upstream-net-this-kasan-gce	2020/09/01 00:57	net	bb8872a1e6bc	d5a3ae1f	.config	log	report
ci-upstream-net-this-kasan-gce	2020/08/30 01:23	net	c8146fe292a7	d5a3ae1f	.config	log	report
ci-upstream-net-this-kasan-gce	2020/08/29 22:05	net	c8146fe292a7	d5a3ae1f	.config	log	report
ci-upstream-net-this-kasan-gce	2020/08/29 06:04	net	5438dd45831e	d5a3ae1f	.config	log	report
ci-upstream-net-this-kasan-gce	2020/08/27 05:16	net	2e1ec861a605	318430cb	.config	log	report
ci-upstream-net-this-kasan-gce	2020/08/15 16:39	net	4ca0d9ac3fd8	424dd8e7	.config	log	report
ci-upstream-net-this-kasan-gce	2020/08/13 03:36	net	06a7a37be55e	bc15f7db	.config	log	report
ci-upstream-net-this-kasan-gce	2020/08/12 03:04	net	633f5b6bca9b	bb3e5fe6	.config	log	report
ci-upstream-net-this-kasan-gce	2020/08/10 17:53	net	7c7ab580db49	7adc7b65	.config	log	report
ci-upstream-net-this-kasan-gce	2020/08/10 07:55	net	7c7ab580db49	70301872	.config	log	report
ci-upstream-net-this-kasan-gce	2020/08/07 15:43	net	8912fd6a61d7	cb436c69	.config	log	report
ci-upstream-net-kasan-gce	2020/12/04 20:49	net-next	55fd59b003f6	20366b87	.config	log	report		info
ci-upstream-net-kasan-gce	2020/11/22 20:51	net-next	f9e425e99b07	0d27f508	.config	log	report		info
ci-upstream-net-kasan-gce	2020/11/18 15:46	net-next	6997faa997ba	09323409	.config	log	report		info
ci-upstream-net-kasan-gce	2020/11/14 12:30	net-next	774626fa440e	1bf9a662	.config	log	report		info
ci-upstream-net-kasan-gce	2020/11/12 10:03	net-next	e545f8657393	cca87986	.config	log	report		info
ci-upstream-net-kasan-gce	2020/11/07 22:22	net-next	ae0d0bb29b31	64069d48	.config	log	report		info
ci-upstream-net-kasan-gce	2020/09/28 05:09	net-next	090bc03bc938	5dd8aee8	.config	log	report		info
ci-upstream-net-kasan-gce	2020/09/27 17:53	net-next	435be28b0789	5dd8aee8	.config	log	report		info
ci-upstream-net-kasan-gce	2020/09/26 00:15	net-next	aafe8853f5e2	4a006f63	.config	log	report		info
ci-upstream-net-kasan-gce	2020/09/24 22:15	net-next	1a26e88d534b	54289b08	.config	log	report		info
ci-upstream-net-kasan-gce	2020/09/12 17:26	net-next	5a6bd84f8154	ce441f06	.config	log	report
ci-upstream-net-kasan-gce	2020/09/09 01:27	net-next	4349abdb409b	abf9ba4f	.config	log	report
ci-upstream-net-kasan-gce	2020/09/07 16:00	net-next	02a20d4fef3d	abf9ba4f	.config	log	report
ci-upstream-net-kasan-gce	2020/09/06 09:18	net-next	447a851bdb1a	abf9ba4f	.config	log	report
ci-upstream-net-kasan-gce	2020/09/06 05:31	net-next	447a851bdb1a	abf9ba4f	.config	log	report
ci-upstream-net-kasan-gce	2020/08/31 04:07	net-next	0f091e43310f	d5a3ae1f	.config	log	report
ci-upstream-net-kasan-gce	2020/08/30 21:24	net-next	0f091e43310f	d5a3ae1f	.config	log	report
ci-upstream-net-kasan-gce	2020/08/30 09:34	net-next	0f091e43310f	d5a3ae1f	.config	log	report
ci-upstream-net-kasan-gce	2020/08/28 09:48	net-next	50aba46c234e	816e0689	.config	log	report
ci-upstream-net-kasan-gce	2020/08/27 11:46	net-next	f09665811b14	816e0689	.config	log	report
ci-upstream-net-kasan-gce	2020/08/26 00:53	net-next	fdf1923bf9f7	344da168	.config	log	report
ci-upstream-net-kasan-gce	2020/08/24 23:57	net-next	7611cbb900b4	67b599d1	.config	log	report
ci-upstream-net-kasan-gce	2020/08/23 20:38	net-next	d7223aa58671	cef5ae68	.config	log	report
ci-upstream-net-kasan-gce	2020/08/16 19:39	net-next	7fca4dee610d	424dd8e7	.config	log	report
ci-upstream-net-kasan-gce	2020/08/16 05:39	net-next	7fca4dee610d	424dd8e7	.config	log	report
ci-upstream-net-kasan-gce	2020/08/15 02:46	net-next	7fca4dee610d	424dd8e7	.config	log	report
ci-upstream-net-kasan-gce	2020/08/14 18:01	net-next	a1d21081a60d	424dd8e7	.config	log	report
ci-upstream-net-kasan-gce	2020/08/14 14:34	net-next	a1d21081a60d	424dd8e7	.config	log	report
ci-upstream-net-kasan-gce	2020/08/14 00:13	net-next	bfdd5aaa54b0	54ce1ed6	.config	log	report
ci-upstream-net-kasan-gce	2020/08/13 17:26	net-next	bfdd5aaa54b0	bc15f7db	.config	log	report
ci-upstream-net-kasan-gce	2020/08/13 08:12	net-next	bfdd5aaa54b0	bc15f7db	.config	log	report
ci-upstream-net-kasan-gce	2020/08/12 22:45	net-next	bfdd5aaa54b0	bc15f7db	.config	log	report
ci-upstream-net-kasan-gce	2020/08/10 22:37	net-next	bfdd5aaa54b0	7adc7b65	.config	log	report
ci-upstream-net-kasan-gce	2020/08/08 20:06	net-next	bfdd5aaa54b0	f721e4a0	.config	log	report
ci-upstream-linux-next-kasan-gce-root	2020/11/13 01:44	linux-next	6dd65e60af98	16fca0c8	.config	log	report		info
ci-upstream-linux-next-kasan-gce-root	2020/10/02 18:39	linux-next	2172e358cd17	4969d6ca	.config	log	report		info
ci-upstream-linux-next-kasan-gce-root	2020/09/12 14:32	linux-next	d5b2251d63b5	ce441f06	.config	log	report
ci-upstream-linux-next-kasan-gce-root	2020/09/10 23:26	linux-next	7ce53e3a447b	409809d8	.config	log	report
ci-upstream-linux-next-kasan-gce-root	2020/08/17 20:52	linux-next	0f1fa5848ab3	424dd8e7	.config	log	report
ci-upstream-linux-next-kasan-gce-root	2020/08/17 03:58	linux-next	0f1fa5848ab3	424dd8e7	.config	log	report