==================================================================
BUG: KASAN: use-after-free in list_empty include/linux/list.h:189 [inline]
BUG: KASAN: use-after-free in sg_remove_request+0xf9/0x110 drivers/scsi/sg.c:2120
Read of size 8 at addr ffff8801d20bfd40 by task syz-executor4/12365

CPU: 1 PID: 12365 Comm: syz-executor4 Not tainted 4.4.113-g202e079 #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 8cdf750419e4d0ca ffff8801ce35fab0 ffffffff81d0278d
 ffffea0007482fc0 ffff8801d20bfd40 0000000000000000 ffff8801d20bfd40
 ffff8800bae82338 ffff8801ce35fae8 ffffffff814fd053 ffff8801d20bfd40
Call Trace:
 [<ffffffff81d0278d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d0278d>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff814fd053>] print_address_description+0x73/0x260 mm/kasan/report.c:252
 [<ffffffff814fd565>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff814fd565>] kasan_report+0x285/0x370 mm/kasan/report.c:408
 [<ffffffff814fd6c4>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff825b6d79>] list_empty include/linux/list.h:189 [inline]
 [<ffffffff825b6d79>] sg_remove_request+0xf9/0x110 drivers/scsi/sg.c:2120
 [<ffffffff825b72f5>] sg_finish_rem_req+0x295/0x340 drivers/scsi/sg.c:1837
 [<ffffffff825b919b>] sg_read+0xa1b/0x1490 drivers/scsi/sg.c:537
 [<ffffffff8151bc93>] __vfs_read+0x103/0x440 fs/read_write.c:432
 [<ffffffff8151db33>] vfs_read+0x123/0x3a0 fs/read_write.c:454
 [<ffffffff81520479>] SYSC_read fs/read_write.c:569 [inline]
 [<ffffffff81520479>] SyS_read+0xd9/0x1b0 fs/read_write.c:562
 [<ffffffff83771b5f>] entry_SYSCALL_64_fastpath+0x1c/0x98

Allocated by task 9204:
 [<ffffffff81035df6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fc0c3>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814fc38d>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814fc38d>] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:616
 [<ffffffff814fc962>] kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:554
 [<ffffffff814f803a>] slab_post_alloc_hook mm/slub.c:1349 [inline]
 [<ffffffff814f803a>] slab_alloc_node mm/slub.c:2615 [inline]
 [<ffffffff814f803a>] slab_alloc mm/slub.c:2623 [inline]
 [<ffffffff814f803a>] kmem_cache_alloc+0xba/0x290 mm/slub.c:2628
 [<ffffffff81557437>] fasync_alloc fs/fcntl.c:603 [inline]
 [<ffffffff81557437>] fasync_add_entry fs/fcntl.c:661 [inline]
 [<ffffffff81557437>] fasync_helper+0x37/0xb0 fs/fcntl.c:690
 [<ffffffff81535088>] pipe_fasync+0xf8/0x1c0 fs/pipe.c:581
 [<ffffffff81555def>] setfl fs/fcntl.c:69 [inline]
 [<ffffffff81555def>] do_fcntl fs/fcntl.c:266 [inline]
 [<ffffffff81555def>] SYSC_fcntl fs/fcntl.c:371 [inline]
 [<ffffffff81555def>] SyS_fcntl+0x64f/0xc40 fs/fcntl.c:356
 [<ffffffff83771b5f>] entry_SYSCALL_64_fastpath+0x1c/0x98

Freed by task 9232:
 [<ffffffff81035df6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fc0c3>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814fc9e2>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814fc9e2>] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:589
 [<ffffffff814f9127>] slab_free_hook mm/slub.c:1383 [inline]
 [<ffffffff814f9127>] slab_free_freelist_hook mm/slub.c:1405 [inline]
 [<ffffffff814f9127>] slab_free mm/slub.c:2859 [inline]
 [<ffffffff814f9127>] kmem_cache_free+0xc7/0x320 mm/slub.c:2881
 [<ffffffff81554fdd>] fasync_free_rcu+0x1d/0x20 fs/fcntl.c:562
 [<ffffffff81294084>] __rcu_reclaim kernel/rcu/rcu.h:118 [inline]
 [<ffffffff81294084>] rcu_do_batch kernel/rcu/tree.c:2705 [inline]
 [<ffffffff81294084>] invoke_rcu_callbacks kernel/rcu/tree.c:2973 [inline]
 [<ffffffff81294084>] __rcu_process_callbacks kernel/rcu/tree.c:2940 [inline]
 [<ffffffff81294084>] rcu_process_callbacks+0x7f4/0x14a0 kernel/rcu/tree.c:2957
 [<ffffffff83775057>] __do_softirq+0x227/0xa38 kernel/softirq.c:273

The buggy address belongs to the object at ffff8801d20bfd00
 which belongs to the cache fasync_cache of size 96
The buggy address is located 64 bytes inside of
 96-byte region [ffff8801d20bfd00, ffff8801d20bfd60)
The buggy address belongs to the page:
BUG: unable to handle kernel paging request at fffffffdf62ab780
IP: [<ffffffff8122a525>] cpuacct_charge+0x155/0x390 kernel/sched/cpuacct.c:247
PGD 420f067 PUD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 12353 Comm: syz-executor4 Not tainted 4.4.113-g202e079 #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d78997c0 task.stack: ffff8800bab88000
RIP: 0010:[<ffffffff8122a525>]  [<ffffffff8122a525>] cpuacct_charge+0x155/0x390 kernel/sched/cpuacct.c:247
RSP: 0000:ffff8801db207a20  EFLAGS: 00010046
RAX: 1ffffffff0854fff RBX: 0000000000018528 RCX: ffffffff847eb500
RDX: fffffbffbec556f0 RSI: fffffffdf62ab780 RDI: ffffffff842a7ff8
RBP: ffff8801db207a68 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 1ffff1003b640f10 R12: ffffffff842a7f20
R13: dffffc0000000000 R14: 00000000649d2562 R15: ffffffffce358050
FS:  0000000001130940(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffdf62ab780 CR3: 00000000b0fde000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff8122a430 ffff8801db207a50 0000000000000046 0000000000000003
 ffff8800ba531820 ffffffff83844340 00000000649d2562 ffff8800ba531870
 ffff8800ba5317c0 ffff8801db207ab8 ffffffff811dbea7 ffff8801db31f4c0
Call Trace:
 <IRQ> 
 [<ffffffff811dbea7>] update_curr+0x2c7/0x6c0 kernel/sched/fair.c:882
 [<ffffffff811e4033>] enqueue_entity kernel/sched/fair.c:3511 [inline]
 [<ffffffff811e4033>] enqueue_task_fair+0x313/0x2940 kernel/sched/fair.c:4694
 [<ffffffff811bb7f8>] enqueue_task kernel/sched/core.c:856 [inline]
 [<ffffffff811bb7f8>] activate_task+0x148/0x270 kernel/sched/core.c:872
 [<ffffffff811bc79f>] ttwu_activate kernel/sched/core.c:1734 [inline]
 [<ffffffff811bc79f>] ttwu_do_activate.constprop.131+0xbf/0x1e0 kernel/sched/core.c:1787
 [<ffffffff811bfb8d>] ttwu_queue kernel/sched/core.c:1932 [inline]
 [<ffffffff811bfb8d>] try_to_wake_up+0x68d/0xf60 kernel/sched/core.c:2066
 [<ffffffff811c05a5>] wake_up_process+0x15/0x20 kernel/sched/core.c:2140
 [<ffffffff8117ab21>] wake_up_worker kernel/workqueue.c:846 [inline]
 [<ffffffff8117ab21>] insert_work+0x171/0x210 kernel/workqueue.c:1318
 [<ffffffff8117af9c>] __queue_work+0x3dc/0xea0 kernel/workqueue.c:1433
 [<ffffffff8117bac8>] delayed_work_timer_fn+0x68/0x90 kernel/workqueue.c:1472
 [<ffffffff8129fd4b>] call_timer_fn+0x18b/0x860 kernel/time/timer.c:1178
 [<ffffffff812a1ca5>] __run_timers kernel/time/timer.c:1250 [inline]
 [<ffffffff812a1ca5>] run_timer_softirq+0x4a5/0xbb0 kernel/time/timer.c:1437
 [<ffffffff83775057>] __do_softirq+0x227/0xa38 kernel/softirq.c:273
 [<ffffffff8113daf9>] invoke_softirq kernel/softirq.c:350 [inline]
 [<ffffffff8113daf9>] irq_exit+0x119/0x140 kernel/softirq.c:391
 [<ffffffff837747bb>] exiting_irq arch/x86/include/asm/apic.h:653 [inline]
 [<ffffffff837747bb>] smp_apic_timer_interrupt+0x7b/0xa0 arch/x86/kernel/apic/apic.c:926
 [<ffffffff83773710>] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:737
 <EOI> 
 [<ffffffff812e2ecd>] smp_call_function_many+0x47d/0x720 kernel/smp.c:435
 [<ffffffff810ed6ae>] native_flush_tlb_others+0xfe/0x710 arch/x86/mm/tlb.c:292
 [<ffffffff810eddc3>] flush_tlb_others arch/x86/include/asm/paravirt.h:338 [inline]
 [<ffffffff810eddc3>] flush_tlb_mm_range+0x103/0x560 arch/x86/mm/tlb.c:358
 [<ffffffff814c9bd5>] flush_tlb_page arch/x86/include/asm/tlbflush.h:287 [inline]
 [<ffffffff814c9bd5>] ptep_clear_flush+0xd5/0x110 mm/pgtable-generic.c:80
 [<ffffffff81496226>] wp_page_copy.isra.72+0x5e6/0xad0 mm/memory.c:2156
 [<ffffffff81499f8d>] do_wp_page+0x1bd/0x10d0 mm/memory.c:2395
 [<ffffffff814a0d44>] handle_pte_fault mm/memory.c:3314 [inline]
 [<ffffffff814a0d44>] __handle_mm_fault mm/memory.c:3426 [inline]
 [<ffffffff814a0d44>] handle_mm_fault+0x19d4/0x3190 mm/memory.c:3455
 [<ffffffff810dc6cb>] __do_page_fault+0x35b/0xa00 arch/x86/mm/fault.c:1245
 [<ffffffff810dcd97>] do_page_fault+0x27/0x30 arch/x86/mm/fault.c:1308
 [<ffffffff83772f88>] page_fault+0x28/0x30 arch/x86/entry/entry_64.S:1033
Code: 49 8d bc 24 d8 00 00 00 48 89 f8 48 c1 e8 03 42 80 3c 28 00 0f 85 9e 01 00 00 49 8b 9c 24 d8 00 00 00 80 3a 00 0f 85 0a 02 00 00 <4a> 03 1c f9 48 89 d8 48 c1 e8 03 42 80 3c 28 00 0f 85 cf 01 00 
RIP  [<ffffffff8122a525>] cpuacct_charge+0x155/0x390 kernel/sched/cpuacct.c:247
 RSP <ffff8801db207a20>
CR2: fffffffdf62ab780
---[ end trace 014d61a82ef81777 ]---