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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 ffff8801cd1e7240 by task syzkaller981851/3328

CPU: 1 PID: 3328 Comm: syzkaller981851 Not tainted 4.9.76-g8dec074 #23
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801cd157940 ffffffff81d93169 ffffea00073479c0 ffff8801cd1e7240
 0000000000000000 ffff8801cd1e7240 ffff8801c8bb4438 ffff8801cd157978
 ffffffff8153cb43 ffff8801cd1e7240 0000000000000008 0000000000000000
Call Trace:
 [<ffffffff81d93169>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d93169>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8153cb43>] print_address_description+0x73/0x280 mm/kasan/report.c:252
 [<ffffffff8153d065>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff8153d065>] kasan_report+0x275/0x360 mm/kasan/report.c:408
 [<ffffffff8153d1c4>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff82666273>] __read_once_size include/linux/compiler.h:243 [inline]
 [<ffffffff82666273>] list_empty include/linux/list.h:189 [inline]
 [<ffffffff82666273>] sg_remove_request+0x103/0x120 drivers/scsi/sg.c:2120
 [<ffffffff826667f5>] sg_finish_rem_req+0x295/0x340 drivers/scsi/sg.c:1838
 [<ffffffff8266862c>] sg_read+0xa1c/0x1440 drivers/scsi/sg.c:527
 [<ffffffff8156b571>] do_loop_readv_writev.part.17+0x141/0x1e0 fs/read_write.c:714
 [<ffffffff81570492>] do_loop_readv_writev fs/read_write.c:1105 [inline]
 [<ffffffff81570492>] compat_do_readv_writev+0x522/0x760 fs/read_write.c:1099
 [<ffffffff815707b3>] compat_readv+0xe3/0x150 fs/read_write.c:1128
 [<ffffffff81570914>] do_compat_readv+0xf4/0x1d0 fs/read_write.c:1148
 [<ffffffff81572e86>] C_SYSC_readv fs/read_write.c:1160 [inline]
 [<ffffffff81572e86>] compat_SyS_readv+0x26/0x30 fs/read_write.c:1156
 [<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 ffff8801cd1e7200
 which belongs to the cache fasync_cache of size 96
The buggy address is located 64 bytes inside of
 96-byte region [ffff8801cd1e7200, ffff8801cd1e7260)
The buggy address belongs to the page:
page:ffffea00073479c0 count:1 mapcount:0 mapping:          (null) index:0x0
flags: 0x8000000000000080(slab)
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801cd1e7100: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
 ffff8801cd1e7180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8801cd1e7200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                           ^
 ffff8801cd1e7280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801cd1e7300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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