==================================================================
BUG: KASAN: slab-out-of-bounds in __read_once_size include/linux/compiler.h:243 [inline]
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+0x103/0x120 drivers/scsi/sg.c:2120
Read of size 8 at addr ffff8801c987d4c0 by task syzkaller671306/3345

CPU: 1 PID: 3345 Comm: syzkaller671306 Not tainted 4.9.77-ge12a9c4 #18
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801c7e879b0 ffffffff81d941c9 ffffea0007261f40 ffff8801c987d4c0
 0000000000000000 ffff8801c987d4c0 ffff8801c82c8238 ffff8801c7e879e8
 ffffffff8153db93 ffff8801c987d4c0 0000000000000008 0000000000000000
Call Trace:
 [<ffffffff81d941c9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d941c9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8153db93>] print_address_description+0x73/0x280 mm/kasan/report.c:252
 [<ffffffff8153e0b5>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff8153e0b5>] kasan_report+0x275/0x360 mm/kasan/report.c:408
 [<ffffffff8153e214>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff82667363>] __read_once_size include/linux/compiler.h:243 [inline]
 [<ffffffff82667363>] list_empty include/linux/list.h:189 [inline]
 [<ffffffff82667363>] sg_remove_request+0x103/0x120 drivers/scsi/sg.c:2120
 [<ffffffff826678e5>] sg_finish_rem_req+0x295/0x340 drivers/scsi/sg.c:1838
 [<ffffffff8266971c>] sg_read+0xa1c/0x1440 drivers/scsi/sg.c:527
 [<ffffffff8156c5c1>] do_loop_readv_writev.part.17+0x141/0x1e0 fs/read_write.c:714
 [<ffffffff81570430>] do_loop_readv_writev fs/read_write.c:880 [inline]
 [<ffffffff81570430>] do_readv_writev+0x520/0x750 fs/read_write.c:874
 [<ffffffff815706e4>] vfs_readv+0x84/0xc0 fs/read_write.c:898
 [<ffffffff81570806>] do_readv+0xe6/0x250 fs/read_write.c:924
 [<ffffffff81573cf7>] SYSC_readv fs/read_write.c:1011 [inline]
 [<ffffffff81573cf7>] SyS_readv+0x27/0x30 fs/read_write.c:1008
 [<ffffffff838b2c2e>] entry_SYSCALL_64_fastpath+0x29/0xe8

Allocated by task 0:
(stack is not available)

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff8801c987d480
 which belongs to the cache fasync_cache of size 96
The buggy address is located 64 bytes inside of
 96-byte region [ffff8801c987d480, ffff8801c987d4e0)
The buggy address belongs to the page:
page:ffffea0007261f40 count:1 mapcount:0 mapping:          (null) index:0x0
flags: 0x8000000000000080(slab)
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c987d380: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
 ffff8801c987d400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8801c987d480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                           ^
 ffff8801c987d500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801c987d580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================