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BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:243 [inline]
BUG: KASAN: use-after-free in list_empty include/linux/list.h:189 [inline]
BUG: KASAN: use-after-free in sg_remove_request+0x103/0x120 drivers/scsi/sg.c:2110
Read of size 8 at addr ffff8801c4379ec0 by task syz-executor4/25931

CPU: 0 PID: 25931 Comm: syz-executor4 Not tainted 4.9.86-gb324a70 #50
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801b6ac7a60 ffffffff81d956f9 ffffea000710de40 ffff8801c4379ec0
 0000000000000000 ffff8801c4379ec0 ffff8801c4982338 ffff8801b6ac7a98
 ffffffff8153e083 ffff8801c4379ec0 0000000000000008 0000000000000000
Call Trace:
 [<ffffffff81d956f9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d956f9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8153e083>] print_address_description+0x73/0x280 mm/kasan/report.c:252
 [<ffffffff8153e5a5>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff8153e5a5>] kasan_report+0x275/0x360 mm/kasan/report.c:408
 [<ffffffff8153e704>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff82668d23>] __read_once_size include/linux/compiler.h:243 [inline]
 [<ffffffff82668d23>] list_empty include/linux/list.h:189 [inline]
 [<ffffffff82668d23>] sg_remove_request+0x103/0x120 drivers/scsi/sg.c:2110
 [<ffffffff826692a5>] sg_finish_rem_req+0x295/0x340 drivers/scsi/sg.c:1827
 [<ffffffff8266b156>] sg_read+0xa16/0x1440 drivers/scsi/sg.c:526
 [<ffffffff8156c033>] __vfs_read+0x103/0x670 fs/read_write.c:449
 [<ffffffff8156ff4e>] vfs_read+0x11e/0x380 fs/read_write.c:472
 [<ffffffff81573c49>] SYSC_read fs/read_write.c:588 [inline]
 [<ffffffff81573c49>] SyS_read+0xd9/0x1b0 fs/read_write.c:581
 [<ffffffff81006504>] do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282
 [<ffffffff838b5613>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Allocated by task 25950:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57
 save_stack+0x43/0xd0 mm/kasan/kasan.c:505
 set_track mm/kasan/kasan.c:517 [inline]
 kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:609
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:547
 slab_post_alloc_hook mm/slab.h:417 [inline]
 slab_alloc_node mm/slub.c:2715 [inline]
 slab_alloc mm/slub.c:2723 [inline]
 kmem_cache_alloc+0xba/0x290 mm/slub.c:2728
 fasync_alloc+0x1a/0x20 fs/fcntl.c:608
 do_fcntl_add_lease fs/locks.c:1888 [inline]
 fcntl_setlease+0xcb/0x220 fs/locks.c:1917
 do_fcntl fs/fcntl.c:329 [inline]
 SYSC_fcntl fs/fcntl.c:376 [inline]
 SyS_fcntl+0x6e6/0xc70 fs/fcntl.c:361
 do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282
 entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Freed by task 25950:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57
 save_stack+0x43/0xd0 mm/kasan/kasan.c:505
 set_track mm/kasan/kasan.c:517 [inline]
 kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:582
 slab_free_hook mm/slub.c:1355 [inline]
 slab_free_freelist_hook mm/slub.c:1377 [inline]
 slab_free mm/slub.c:2958 [inline]
 kmem_cache_free+0xc7/0x300 mm/slub.c:2980
 fasync_free+0x1c/0x20 fs/fcntl.c:618
 do_fcntl_add_lease fs/locks.c:1899 [inline]
 fcntl_setlease+0x168/0x220 fs/locks.c:1917
 do_fcntl fs/fcntl.c:329 [inline]
 SYSC_fcntl fs/fcntl.c:376 [inline]
 SyS_fcntl+0x6e6/0xc70 fs/fcntl.c:361
 do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282
 entry_SYSCALL_64_after_swapgs+0x5d/0xdb

The buggy address belongs to the object at ffff8801c4379e80
 which belongs to the cache fasync_cache of size 96
The buggy address is located 64 bytes inside of
 96-byte region [ffff8801c4379e80, ffff8801c4379ee0)
The buggy address belongs to the page:
page:ffffea000710de40 count:1 mapcount:0 mapping:          (null) index:0xffff8801c4379980
flags: 0x8000000000000080(slab)
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c4379d80: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
 ffff8801c4379e00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
>ffff8801c4379e80: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
                                           ^
 ffff8801c4379f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801c4379f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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