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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 ffff8801c9c4c2c0 by task syzkaller647420/3329

CPU: 1 PID: 3329 Comm: syzkaller647420 Not tainted 4.9.75-g8910fa5 #19
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801cc697a50 ffffffff81d93049 ffffea0007271300 ffff8801c9c4c2c0
 0000000000000000 ffff8801c9c4c2c0 ffff8801cc480238 ffff8801cc697a88
 ffffffff8153ca53 ffff8801c9c4c2c0 0000000000000008 0000000000000000
Call Trace:
 [<ffffffff81d93049>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d93049>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8153ca53>] print_address_description+0x73/0x280 mm/kasan/report.c:252
 [<ffffffff8153cf75>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff8153cf75>] kasan_report+0x275/0x360 mm/kasan/report.c:408
 [<ffffffff8153d0d4>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff82666163>] __read_once_size include/linux/compiler.h:243 [inline]
 [<ffffffff82666163>] list_empty include/linux/list.h:189 [inline]
 [<ffffffff82666163>] sg_remove_request+0x103/0x120 drivers/scsi/sg.c:2120
 [<ffffffff826666e5>] sg_finish_rem_req+0x295/0x340 drivers/scsi/sg.c:1838
 [<ffffffff8266851c>] sg_read+0xa1c/0x1440 drivers/scsi/sg.c:527
 [<ffffffff8156a8a3>] __vfs_read+0x103/0x670 fs/read_write.c:452
 [<ffffffff8156e63e>] vfs_read+0x11e/0x380 fs/read_write.c:475
 [<ffffffff81572369>] SYSC_read fs/read_write.c:591 [inline]
 [<ffffffff81572369>] SyS_read+0xd9/0x1b0 fs/read_write.c:584
 [<ffffffff81006fc7>] do_syscall_32_irqs_on arch/x86/entry/common.c:322 [inline]
 [<ffffffff81006fc7>] do_fast_syscall_32+0x2f7/0x890 arch/x86/entry/common.c:384
 [<ffffffff838b2334>] entry_SYSENTER_compat+0x74/0x83 arch/x86/entry/entry_64_compat.S:127

Allocated by task 0:
(stack is not available)

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff8801c9c4c280
 which belongs to the cache fasync_cache of size 96
The buggy address is located 64 bytes inside of
 96-byte region [ffff8801c9c4c280, ffff8801c9c4c2e0)
The buggy address belongs to the page:
page:ffffea0007271300 count:1 mapcount:0 mapping:          (null) index:0x0
flags: 0x8000000000000080(slab)
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c9c4c180: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
 ffff8801c9c4c200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8801c9c4c280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                           ^
 ffff8801c9c4c300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801c9c4c380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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