BUG: KASAN: slab-out-of-bounds in __lock_acquire+0x2eff/0x3640 kernel/locking/lockdep.c:3224 at addr ffff8801d5f9e078
Read of size 8 by task syzkaller453905/3282
CPU: 1 PID: 3282 Comm: syzkaller453905 Not tainted 4.9.60-gdfe0a9b #81
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d67cf710 ffffffff81d91389 ffff8801d77fe500 ffff8801d5f9e000
 ffff8801d5f9e060 ffffed003abf3c0f ffff8801d5f9e078 ffff8801d67cf738
 ffffffff8153c1bc ffffed003abf3c0f ffff8801d77fe500 0000000000000000
Call Trace:
 [<ffffffff81d91389>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d91389>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8153c1bc>] kasan_object_err+0x1c/0x70 mm/kasan/report.c:160
 [<ffffffff8153c47c>] print_address_description mm/kasan/report.c:198 [inline]
 [<ffffffff8153c47c>] kasan_report_error mm/kasan/report.c:287 [inline]
 [<ffffffff8153c47c>] kasan_report.part.1+0x21c/0x500 mm/kasan/report.c:309
 [<ffffffff8153c819>] kasan_report mm/kasan/report.c:330 [inline]
 [<ffffffff8153c819>] __asan_report_load8_noabort+0x29/0x30 mm/kasan/report.c:330
 [<ffffffff8123e9ef>] __lock_acquire+0x2eff/0x3640 kernel/locking/lockdep.c:3224
 [<ffffffff8123fb6e>] lock_acquire+0x12e/0x410 kernel/locking/lockdep.c:3756
 [<ffffffff838aa25e>] __raw_write_lock_irqsave include/linux/rwlock_api_smp.h:186 [inline]
 [<ffffffff838aa25e>] _raw_write_lock_irqsave+0x4e/0x62 kernel/locking/spinlock.c:303
 [<ffffffff8265f840>] sg_remove_request+0x70/0x120 drivers/scsi/sg.c:2122
 [<ffffffff8265fe55>] sg_finish_rem_req+0x295/0x340 drivers/scsi/sg.c:1838
 [<ffffffff82661b8c>] sg_read+0x91c/0x1400 drivers/scsi/sg.c:527
 [<ffffffff8156ab91>] do_loop_readv_writev.part.17+0x141/0x1e0 fs/read_write.c:714
 [<ffffffff8156e950>] do_loop_readv_writev fs/read_write.c:880 [inline]
 [<ffffffff8156e950>] do_readv_writev+0x520/0x750 fs/read_write.c:874
 [<ffffffff8156ec04>] vfs_readv+0x84/0xc0 fs/read_write.c:898
 [<ffffffff8156ed26>] do_readv+0xe6/0x250 fs/read_write.c:924
 [<ffffffff815721a7>] SYSC_readv fs/read_write.c:1011 [inline]
 [<ffffffff815721a7>] SyS_readv+0x27/0x30 fs/read_write.c:1008
 [<ffffffff838aa305>] entry_SYSCALL_64_fastpath+0x23/0xc6
Object at ffff8801d5f9e000, in cache fasync_cache size: 96
Allocated:
PID = 3287
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57
 save_stack+0x43/0xd0 mm/kasan/kasan.c:495
 set_track mm/kasan/kasan.c:507 [inline]
 kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:598
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:537
 slab_post_alloc_hook mm/slab.h:417 [inline]
 slab_alloc_node mm/slub.c:2715 [inline]
 slab_alloc mm/slub.c:2723 [inline]
 kmem_cache_alloc+0xba/0x290 mm/slub.c:2728
 fasync_alloc fs/fcntl.c:604 [inline]
 fasync_add_entry fs/fcntl.c:662 [inline]
 fasync_helper+0x37/0xb0 fs/fcntl.c:691
 sg_fasync+0x86/0xb0 drivers/scsi/sg.c:1203
 setfl fs/fcntl.c:70 [inline]
 do_fcntl fs/fcntl.c:267 [inline]
 SYSC_fcntl fs/fcntl.c:372 [inline]
 SyS_fcntl+0x658/0xc70 fs/fcntl.c:357
 entry_SYSCALL_64_fastpath+0x23/0xc6
Freed:
PID = 0
(stack is not available)
Memory state around the buggy address:
 ffff8801d5f9df00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8801d5f9df80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8801d5f9e000: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
                                                                ^
 ffff8801d5f9e080: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
 ffff8801d5f9e100: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
==================================================================
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 3282 Comm: syzkaller453905 Tainted: G    B           4.9.60-gdfe0a9b #81
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801c823c800 task.stack: ffff8801d67c8000
RIP: 0010:[<ffffffff8123bc84>]  [<ffffffff8123bc84>] __lock_acquire+0x194/0x3640 kernel/locking/lockdep.c:3234
RSP: 0018:ffff8801d67cf7e0  EFLAGS: 00010086
RAX: dead4ead00000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 1ffff1003abf3c10 RSI: 0000000000000000 RDI: ffff8801d5f9e080
RBP: ffff8801d67cf9a0 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: ffff8801c823c800 R12: 0000000000000001
R13: 0000000000000001 R14: 0000000000000000 R15: ffff8801d5f9e078
FS:  00007f514fc85700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000208f4f80 CR3: 00000001d07e8000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 00000000024000c0 ffff8801cc1ffb68 ffff8801da0018c0 ffff8801d67cfa28
 ffffffff8153b503 000000400000000b ffff8801d67cf820 ffffffff00000000
 ffffffff8107c6a6 ffffffff8153b4a3 ffffffff8153b72d ffffffff815377eb
Call Trace:
 [<ffffffff8123fb6e>] lock_acquire+0x12e/0x410 kernel/locking/lockdep.c:3756
 [<ffffffff838aa25e>] __raw_write_lock_irqsave include/linux/rwlock_api_smp.h:186 [inline]
 [<ffffffff838aa25e>] _raw_write_lock_irqsave+0x4e/0x62 kernel/locking/spinlock.c:303
 [<ffffffff8265f840>] sg_remove_request+0x70/0x120 drivers/scsi/sg.c:2122
 [<ffffffff8265fe55>] sg_finish_rem_req+0x295/0x340 drivers/scsi/sg.c:1838
 [<ffffffff82661b8c>] sg_read+0x91c/0x1400 drivers/scsi/sg.c:527
 [<ffffffff8156ab91>] do_loop_readv_writev.part.17+0x141/0x1e0 fs/read_write.c:714
 [<ffffffff8156e950>] do_loop_readv_writev fs/read_write.c:880 [inline]
 [<ffffffff8156e950>] do_readv_writev+0x520/0x750 fs/read_write.c:874
 [<ffffffff8156ec04>] vfs_readv+0x84/0xc0 fs/read_write.c:898
 [<ffffffff8156ed26>] do_readv+0xe6/0x250 fs/read_write.c:924
 [<ffffffff815721a7>] SYSC_readv fs/read_write.c:1011 [inline]
 [<ffffffff815721a7>] SyS_readv+0x27/0x30 fs/read_write.c:1008
 [<ffffffff838aa305>] entry_SYSCALL_64_fastpath+0x23/0xc6
Code: 9e ff ff 44 8b 94 24 98 00 00 00 48 85 c0 8b 8c 24 90 00 00 00 44 8b 8c 24 88 00 00 00 4c 8b 9c 24 80 00 00 00 0f 84 ff 07 00 00 <f0> ff 80 98 01 00 00 49 8d b3 a8 08 00 00 48 ba 00 00 00 00 00 
RIP  [<ffffffff8123bc84>] __lock_acquire+0x194/0x3640 kernel/locking/lockdep.c:3234
 RSP <ffff8801d67cf7e0>
---[ end trace 6d0fef6a3029bbea ]---