==================================================================
audit: type=1400 audit(1520674974.064:284): avc:  denied  { create } for  pid=15206 comm="syz-executor5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_netfilter_socket permissive=1
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 ffff8800ae6bd440 by task syz-executor2/15223

CPU: 0 PID: 15223 Comm: syz-executor2 Not tainted 4.4.120-gd63fdf6 #28
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 863dcc453b6ae671 ffff8800a7157ab0 ffffffff81d0408d
 ffffea0002b9af40 ffff8800ae6bd440 0000000000000000 ffff8800ae6bd440
 ffff8801d6a5a338 ffff8800a7157ae8 ffffffff814fe143 ffff8800ae6bd440
Call Trace:
 [<ffffffff81d0408d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d0408d>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff814fe143>] print_address_description+0x73/0x260 mm/kasan/report.c:252
 [<ffffffff814fe655>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff814fe655>] kasan_report+0x285/0x370 mm/kasan/report.c:408
 [<ffffffff814fe7b4>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff825b8439>] list_empty include/linux/list.h:189 [inline]
 [<ffffffff825b8439>] sg_remove_request+0xf9/0x110 drivers/scsi/sg.c:2120
 [<ffffffff825b89b5>] sg_finish_rem_req+0x295/0x340 drivers/scsi/sg.c:1837
 [<ffffffff825ba85b>] sg_read+0xa1b/0x1490 drivers/scsi/sg.c:537
 [<ffffffff8151cf33>] __vfs_read+0x103/0x440 fs/read_write.c:432
 [<ffffffff8151edd3>] vfs_read+0x123/0x3a0 fs/read_write.c:454
 [<ffffffff81521719>] SYSC_read fs/read_write.c:569 [inline]
 [<ffffffff81521719>] SyS_read+0xd9/0x1b0 fs/read_write.c:562
 [<ffffffff8377395f>] entry_SYSCALL_64_fastpath+0x1c/0x98

Allocated by task 7493:
 [<ffffffff81035d96>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fd1b3>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814fd47d>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814fd47d>] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:616
 [<ffffffff814fda52>] kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:554
 [<ffffffff814f912a>] slab_post_alloc_hook mm/slub.c:1349 [inline]
 [<ffffffff814f912a>] slab_alloc_node mm/slub.c:2615 [inline]
 [<ffffffff814f912a>] slab_alloc mm/slub.c:2623 [inline]
 [<ffffffff814f912a>] kmem_cache_alloc+0xba/0x290 mm/slub.c:2628
 [<ffffffff815585da>] fasync_alloc+0x1a/0x20 fs/fcntl.c:607
 [<ffffffff816151bb>] do_fcntl_add_lease fs/locks.c:1824 [inline]
 [<ffffffff816151bb>] fcntl_setlease+0xcb/0x220 fs/locks.c:1853
 [<ffffffff81557367>] do_fcntl fs/fcntl.c:328 [inline]
 [<ffffffff81557367>] SYSC_fcntl fs/fcntl.c:375 [inline]
 [<ffffffff81557367>] SyS_fcntl+0x6e7/0xc40 fs/fcntl.c:360
 [<ffffffff8377395f>] entry_SYSCALL_64_fastpath+0x1c/0x98

Freed by task 7493:
 [<ffffffff81035d96>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fd1b3>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814fdad2>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814fdad2>] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:589
 [<ffffffff814fa217>] slab_free_hook mm/slub.c:1383 [inline]
 [<ffffffff814fa217>] slab_free_freelist_hook mm/slub.c:1405 [inline]
 [<ffffffff814fa217>] slab_free mm/slub.c:2859 [inline]
 [<ffffffff814fa217>] kmem_cache_free+0xc7/0x320 mm/slub.c:2881
 [<ffffffff815585fc>] fasync_free+0x1c/0x20 fs/fcntl.c:617
 [<ffffffff81615258>] do_fcntl_add_lease fs/locks.c:1835 [inline]
 [<ffffffff81615258>] fcntl_setlease+0x168/0x220 fs/locks.c:1853
 [<ffffffff81557367>] do_fcntl fs/fcntl.c:328 [inline]
 [<ffffffff81557367>] SYSC_fcntl fs/fcntl.c:375 [inline]
 [<ffffffff81557367>] SyS_fcntl+0x6e7/0xc40 fs/fcntl.c:360
 [<ffffffff8377395f>] entry_SYSCALL_64_fastpath+0x1c/0x98

The buggy address belongs to the object at ffff8800ae6bd400
 which belongs to the cache fasync_cache of size 96
The buggy address is located 64 bytes inside of
 96-byte region [ffff8800ae6bd400, ffff8800ae6bd460)
The buggy address belongs to the page:
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 3843 Comm: syz-executor2 Not tainted 4.4.120-gd63fdf6 #28
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8800ba9c3000 task.stack: ffff8801d7060000
RIP: 0010:[<ffffffff811a6cad>]  [<ffffffff811a6cad>] task_curr kernel/sched/core.c:1023 [inline]
RIP: 0010:[<ffffffff811a6cad>]  [<ffffffff811a6cad>] kick_process+0xdd/0x1c0 kernel/sched/core.c:1565
RSP: 0018:ffff8801d7067b88  EFLAGS: 00010002
RAX: dffffc0000000000 RBX: 000000000001f4c0 RCX: ffffffff81d63e4b
RDX: 0000000097a4d780 RSI: ffffffff839fe520 RDI: 00000004bd26bc00
RBP: ffff8801d7067ba8 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 1ffff1003ae0cf2a R12: ffff8801d6d2c800
R13: 00000000a7150050 R14: 00000000a7150050 R15: ffff8800bb0805c0
FS:  0000000002a3c940(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000072c000 CR3: 00000001d3362000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801d6d2c800 0000000000000080 dffffc0000000000 ffff8800b57b0000
 ffff8801d7067bc8 ffffffff81153bd5 ffff8801d6d2c800 ffff8800b688e000
 ffff8801d7067c20 ffffffff811541d6 ffff8801c7464800 ffffffff8115574b
Call Trace:
 [<ffffffff81153bd5>] signal_wake_up_state+0x55/0x70 kernel/signal.c:660
 [<ffffffff811541d6>] signal_wake_up include/linux/sched.h:3319 [inline]
 [<ffffffff811541d6>] complete_signal+0x5b6/0x700 kernel/signal.c:942
 [<ffffffff81155b1f>] __send_signal+0x90f/0x1330 kernel/signal.c:1080
 [<ffffffff8115658a>] send_signal+0x4a/0xc0 kernel/signal.c:1096
 [<ffffffff81158d14>] do_send_sig_info+0xa4/0x130 kernel/signal.c:1151
 [<ffffffff81159b9d>] group_send_sig_info+0xdd/0x170 kernel/signal.c:1273
 [<ffffffff81159cc0>] __kill_pgrp_info+0x90/0x120 kernel/signal.c:1291
 [<ffffffff8115a2c6>] kill_something_info kernel/signal.c:1397 [inline]
 [<ffffffff8115a2c6>] SYSC_kill+0x366/0x5b0 kernel/signal.c:2867
 [<ffffffff8116049c>] SyS_kill+0x1c/0x30 kernel/signal.c:2857
 [<ffffffff8377395f>] entry_SYSCALL_64_fastpath+0x1c/0x98
Code: 04 02 84 c0 74 08 3c 03 0f 8e b7 00 00 00 48 b8 00 00 00 00 00 fc ff df 45 8b 6d 10 4a 8d 3c ed 80 b9 7e 84 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 be 00 00 00 4a 03 1c ed 80 b9 7e 84 48 b8 00 
RIP  [<ffffffff811a6cad>] task_curr kernel/sched/core.c:1023 [inline]
RIP  [<ffffffff811a6cad>] kick_process+0xdd/0x1c0 kernel/sched/core.c:1565
 RSP <ffff8801d7067b88>
---[ end trace 39ef0932aa302cb7 ]---