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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:2110
Read of size 8 at addr ffff8801bf7c2140 by task syzkaller342907/3801

CPU: 1 PID: 3801 Comm: syzkaller342907 Not tainted 4.9.88-gbb52bba #59
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d7627940 ffffffff81d95f19 ffffea0006fdf080 ffff8801bf7c2140
 0000000000000000 ffff8801bf7c2140 ffff8801d7738238 ffff8801d7627978
 ffffffff8153e793 ffff8801bf7c2140 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
 [<ffffffff8156d338>] do_loop_readv_writev.part.17+0xc8/0x2b0 fs/read_write.c:715
 [<ffffffff8157147d>] do_loop_readv_writev fs/read_write.c:879 [inline]
 [<ffffffff8157147d>] do_readv_writev+0x5fd/0x740 fs/read_write.c:873
 [<ffffffff81571644>] vfs_readv+0x84/0xc0 fs/read_write.c:897
 [<ffffffff81571766>] do_readv+0xe6/0x250 fs/read_write.c:923
 [<ffffffff81574c37>] SYSC_readv fs/read_write.c:1010 [inline]
 [<ffffffff81574c37>] SyS_readv+0x27/0x30 fs/read_write.c:1007
 [<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 ffff8801bf7c2100
 which belongs to the cache fasync_cache of size 96
The buggy address is located 64 bytes inside of
 96-byte region [ffff8801bf7c2100, ffff8801bf7c2160)
The buggy address belongs to the page:
page:ffffea0006fdf080 count:1 mapcount:0 mapping:          (null) index:0x0
flags: 0x8000000000000080(slab)
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801bf7c2000: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
 ffff8801bf7c2080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8801bf7c2100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                           ^
 ffff8801bf7c2180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801bf7c2200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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