KASAN: stack-out-of-bounds Read in init_rcu

Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported
BUG: unable to handle kernel paging request in ttwu_do_activate kernel				1	2135d	2135d
PANIC: double fault, error_code: 0x0
CPU: 1 PID: 12635 Comm: syz-executor6 Not tainted 4.18.0-rc3+ #45
==================================================================
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
BUG: KASAN: stack-out-of-bounds in lookup_object lib/debugobjects.c:157 [inline]
BUG: KASAN: stack-out-of-bounds in __debug_object_init+0xe55/0x12e0 lib/debugobjects.c:383
RIP: 0010:__lock_acquire+0x2e/0x5020 kernel/locking/lockdep.c:3294
Read of size 8 at addr ffff8801d8ea8168 by task kworker/0:1H/1817
Code: 

41 
CPU: 0 PID: 1817 Comm: kworker/0:1H Not tainted 4.18.0-rc3+ #45
57 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
41 
Workqueue: kblockd blk_mq_requeue_work
89 
cf 
Call Trace:
41 56 
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
41 55 
49 
89 
fd 
41 54 
 print_address_description+0x6c/0x20b mm/kasan/report.c:256
45 89 
cc 
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
53 
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
65 
 lookup_object lib/debugobjects.c:157 [inline]
 __debug_object_init+0xe55/0x12e0 lib/debugobjects.c:383
4c 
8b 
34 25 
40 ee 
01 00 
48 
83 e4 
f0 
48 81 
ec 
60 03 
00 
00 
48 8b 
45 
10 <89> 
94 24 
 debug_object_init+0x16/0x20 lib/debugobjects.c:429
80 
 init_rcu_head+0x10/0x20 kernel/rcu/update.c:375
00 00 
 scsi_initialize_rq drivers/scsi/scsi_lib.c:1191 [inline]
 scsi_init_command+0x586/0x7a0 drivers/scsi/scsi_lib.c:1237
00 
48 
ba 00 
00 
 scsi_mq_prep_fn drivers/scsi/scsi_lib.c:1960 [inline]
 scsi_queue_rq+0xfa4/0x1ef0 drivers/scsi/scsi_lib.c:2052
00 
00 
00 
fc ff 
df 
48 89 
84 
24 98 
RSP: 0018:ffff8801d89ffe20 EFLAGS: 00010082
RAX: 0000000000000000 RBX: 1ffff1003b140040 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff88f92620
RBP: ffff8801d8a001a8 R08: 0000000000000000 R09: 0000000000000000
R10: ffff8801d8f271b8 R11: ffff8801daf236b3 R12: 0000000000000000
R13: ffffffff88f92620 R14: ffff8801ae1f81c0 R15: 0000000000000002
FS:  00007fe058c89700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8801d89ffe18 CR3: 00000001ca091000 CR4: 00000000001406e0
DR0: 00000000200001c0 DR1: 0000000020000080 DR2: 0000000000000000
 blk_mq_dispatch_rq_list+0xe12/0x24d0 block/blk-mq.c:1143
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace: