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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 ffff8801bfba94c0 by task syz-executor0/14757

CPU: 0 PID: 14757 Comm: syz-executor0 Not tainted 4.9.85-g4c4262a #55
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801b6cf7930 ffffffff81d95739 ffffea0006feea40 ffff8801bfba94c0
 0000000000000000 ffff8801bfba94c0 ffff8801d63c4438 ffff8801b6cf7968
 ffffffff8153e0d3 ffff8801bfba94c0 0000000000000008 0000000000000000
Call Trace:
 [<ffffffff81d95739>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d95739>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8153e0d3>] print_address_description+0x73/0x280 mm/kasan/report.c:252
 [<ffffffff8153e5f5>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff8153e5f5>] kasan_report+0x275/0x360 mm/kasan/report.c:408
 [<ffffffff8153e754>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff82668d43>] __read_once_size include/linux/compiler.h:243 [inline]
 [<ffffffff82668d43>] list_empty include/linux/list.h:189 [inline]
 [<ffffffff82668d43>] sg_remove_request+0x103/0x120 drivers/scsi/sg.c:2110
 [<ffffffff826692c5>] sg_finish_rem_req+0x295/0x340 drivers/scsi/sg.c:1827
 [<ffffffff8266b176>] sg_read+0xa16/0x1440 drivers/scsi/sg.c:526
 [<ffffffff8156cbe8>] do_loop_readv_writev.part.17+0xc8/0x2b0 fs/read_write.c:715
 [<ffffffff81571dcf>] do_loop_readv_writev fs/read_write.c:1097 [inline]
 [<ffffffff81571dcf>] compat_do_readv_writev+0x5ff/0x740 fs/read_write.c:1091
 [<ffffffff81571ff3>] compat_readv+0xe3/0x150 fs/read_write.c:1120
 [<ffffffff81572154>] do_compat_readv+0xf4/0x1d0 fs/read_write.c:1140
 [<ffffffff815746c6>] C_SYSC_readv fs/read_write.c:1152 [inline]
 [<ffffffff815746c6>] compat_SyS_readv+0x26/0x30 fs/read_write.c:1148
 [<ffffffff81006f95>] do_syscall_32_irqs_on arch/x86/entry/common.c:325 [inline]
 [<ffffffff81006f95>] do_fast_syscall_32+0x2f5/0x870 arch/x86/entry/common.c:387
 [<ffffffff838b6b10>] entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137

Allocated by task 10241:
 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
 C_SYSC_fcntl64 fs/compat.c:469 [inline]
 compat_SyS_fcntl64+0xce/0x4f0 fs/compat.c:403
 do_syscall_32_irqs_on arch/x86/entry/common.c:325 [inline]
 do_fast_syscall_32+0x2f5/0x870 arch/x86/entry/common.c:387
 entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137

Freed by task 17:
 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_rcu+0x1d/0x20 fs/fcntl.c:567
 __rcu_reclaim kernel/rcu/rcu.h:118 [inline]
 rcu_do_batch kernel/rcu/tree.c:2789 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:3053 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:3020 [inline]
 rcu_process_callbacks+0x898/0x1300 kernel/rcu/tree.c:3037
 __do_softirq+0x206/0x951 kernel/softirq.c:284

The buggy address belongs to the object at ffff8801bfba9480
 which belongs to the cache fasync_cache of size 96
The buggy address is located 64 bytes inside of
 96-byte region [ffff8801bfba9480, ffff8801bfba94e0)
The buggy address belongs to the page:
page:ffffea0006feea40 count:1 mapcount:0 mapping:          (null) index:0xffff8801bfba9280
flags: 0x8000000000000080(slab)
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801bfba9380: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
 ffff8801bfba9400: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
>ffff8801bfba9480: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
                                           ^
 ffff8801bfba9500: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff8801bfba9580: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
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