syzbot

==================================================================
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:2110
Read of size 8 at addr ffff8801b9fce140 by task syzkaller144536/3808

CPU: 1 PID: 3808 Comm: syzkaller144536 Not tainted 4.9.88-g71df7bb #60
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d7d5fa60 ffffffff81d95f19 ffffea0006e7f380 ffff8801b9fce140
 0000000000000000 ffff8801b9fce140 ffff8801d81ca338 ffff8801d7d5fa98
 ffffffff8153e793 ffff8801b9fce140 0000000000000008 0000000000000000
Call Trace:
 [<ffffffff81d95f19>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d95f19>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8153e793>] print_address_description+0x73/0x280 mm/kasan/report.c:256
 [<ffffffff8153ec95>] kasan_report_error mm/kasan/report.c:355 [inline]
 [<ffffffff8153ec95>] kasan_report+0x255/0x380 mm/kasan/report.c:412
 [<ffffffff8153ee34>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
 [<ffffffff82669953>] __read_once_size include/linux/compiler.h:243 [inline]
 [<ffffffff82669953>] list_empty include/linux/list.h:189 [inline]
 [<ffffffff82669953>] sg_remove_request+0x103/0x120 drivers/scsi/sg.c:2110
 [<ffffffff82669ed5>] sg_finish_rem_req+0x295/0x340 drivers/scsi/sg.c:1827
 [<ffffffff8266bd86>] sg_read+0xa16/0x1440 drivers/scsi/sg.c:526
 [<ffffffff8156c7d3>] __vfs_read+0x103/0x670 fs/read_write.c:449
 [<ffffffff815706ee>] vfs_read+0x11e/0x380 fs/read_write.c:472
 [<ffffffff815743e9>] SYSC_read fs/read_write.c:588 [inline]
 [<ffffffff815743e9>] SyS_read+0xd9/0x1b0 fs/read_write.c:581
 [<ffffffff81006504>] do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282
 [<ffffffff838b7a53>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Allocated by task 0:
(stack is not available)

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff8801b9fce100
 which belongs to the cache fasync_cache of size 96
The buggy address is located 64 bytes inside of
 96-byte region [ffff8801b9fce100, ffff8801b9fce160)
The buggy address belongs to the page:
page:ffffea0006e7f380 count:1 mapcount:0 mapping:          (null) index:0x0
flags: 0x8000000000000080(slab)
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801b9fce000: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
 ffff8801b9fce080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8801b9fce100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                           ^
 ffff8801b9fce180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801b9fce200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================