==================================================================
BUG: KASAN: slab-out-of-bounds in list_empty include/linux/list.h:189 [inline]
BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 drivers/scsi/sg.c:2130
Read of size 8 at addr ffff8801d0b0c240 by task syzkaller344361/3329

CPU: 0 PID: 3329 Comm: syzkaller344361 Not tainted 4.4.111-gf851888 #23
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 426244f8e70a0c1f ffff8801d03a7ab0 ffffffff81d0507d
 ffffea000742c300 ffff8801d0b0c240 0000000000000000 ffff8801d0b0c240
 ffff8801d4cd4438 ffff8801d03a7ae8 ffffffff814fd433 ffff8801d0b0c240
Call Trace:
 [<ffffffff81d0507d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d0507d>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff814fd433>] print_address_description+0x73/0x260 mm/kasan/report.c:252
 [<ffffffff814fd945>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff814fd945>] kasan_report+0x285/0x370 mm/kasan/report.c:408
 [<ffffffff814fdaa4>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff825b9ce9>] list_empty include/linux/list.h:189 [inline]
 [<ffffffff825b9ce9>] sg_remove_request+0xf9/0x110 drivers/scsi/sg.c:2130
 [<ffffffff825ba265>] sg_finish_rem_req+0x295/0x340 drivers/scsi/sg.c:1848
 [<ffffffff825bc0a1>] sg_read+0xa21/0x1490 drivers/scsi/sg.c:538
 [<ffffffff8151c383>] __vfs_read+0x103/0x440 fs/read_write.c:432
 [<ffffffff8151e223>] vfs_read+0x123/0x3a0 fs/read_write.c:454
 [<ffffffff81520b69>] SYSC_read fs/read_write.c:569 [inline]
 [<ffffffff81520b69>] SyS_read+0xd9/0x1b0 fs/read_write.c:562
 [<ffffffff83775859>] entry_SYSCALL_64_fastpath+0x16/0x92

Allocated by task 0:
(stack is not available)

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff8801d0b0c200
 which belongs to the cache fasync_cache of size 96
The buggy address is located 64 bytes inside of
 96-byte region [ffff8801d0b0c200, ffff8801d0b0c260)
The buggy address belongs to the page:
BUG: unable to handle kernel paging request at ffffebe000000028
IP: [<ffffffff81d65270>] __list_del_entry+0x30/0x1d0 lib/list_debug.c:49
PGD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 7 Comm: rcu_preempt Not tainted 4.4.111-gf851888 #23
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801da3717c0 task.stack: ffff8801da388000
RIP: 0010:[<ffffffff81d65270>]  [<ffffffff81d65270>] __list_del_entry+0x30/0x1d0 lib/list_debug.c:49
RSP: 0018:ffff8801da38f900  EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffffebe000000020 RCX: ffffebe000000020
RDX: ffffebe000000020 RSI: ffff8801da372030 RDI: ffffebe000000028
RBP: ffff8801da38f918 R08: 0000000000000001 R09: ffffffff850e28e0
R10: 0000000000000001 R11: 1ffff1003b471ef0 R12: ffff8801cc940a00
R13: 0000000080000000 R14: 000077ff80000000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffebe000000028 CR3: 00000001d0b7c000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 0000000000000000 ffffebe000000020 ffff8801cc940a00 ffff8801da38f930
 ffffffff81d6541d 0000000000000000 ffff8801da38f960 ffffffff810e93e3
 ffff8801cc940a00 ffff8801cc940d40 0000000000000000 0000000000000000
Call Trace:
 [<ffffffff81d6541d>] list_del+0xd/0x70 lib/list_debug.c:77
 [<ffffffff810e93e3>] pgd_list_del arch/x86/mm/pgtable.c:98 [inline]
 [<ffffffff810e93e3>] pgd_dtor arch/x86/mm/pgtable.c:142 [inline]
 [<ffffffff810e93e3>] pgd_free+0x63/0x100 arch/x86/mm/pgtable.c:407
 [<ffffffff81122e16>] mm_free_pgd kernel/fork.c:552 [inline]
 [<ffffffff81122e16>] __mmdrop+0x66/0x260 kernel/fork.c:698
 [<ffffffff811a44f3>] mmdrop include/linux/sched.h:2776 [inline]
 [<ffffffff811a44f3>] finish_task_switch+0x213/0x4e0 kernel/sched/core.c:2679
 [<ffffffff8376643d>] context_switch kernel/sched/core.c:2803 [inline]
 [<ffffffff8376643d>] __schedule+0xa9d/0x1c70 kernel/sched/core.c:3322
 [<ffffffff8376784a>] schedule+0x9a/0x1c0 kernel/sched/core.c:3351
 [<ffffffff83772a96>] schedule_timeout+0x356/0x970 kernel/time/timer.c:1531
 [<ffffffff81291b99>] rcu_gp_kthread+0xe09/0x2220 kernel/rcu/tree.c:2121
 [<ffffffff811908e8>] kthread+0x268/0x300 kernel/kthread.c:211
 [<ffffffff83775c5f>] ret_from_fork+0x3f/0x70 arch/x86/entry/entry_64.S:494
Code: 00 00 fc ff df 48 89 f9 55 48 83 c7 08 48 89 fa 48 89 e5 41 54 48 c1 ea 03 53 48 83 ec 08 80 3c 02 00 0f 85 87 01 00 00 48 89 ca <48> 8b 59 08 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 
RIP  [<ffffffff81d65270>] __list_del_entry+0x30/0x1d0 lib/list_debug.c:49
 RSP <ffff8801da38f900>
CR2: ffffebe000000028
---[ end trace e82b13d9aad6e8f3 ]---