==================================================================
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 ffff8801d28a61c0 by task syz-executor2/11272

CPU: 1 PID: 11272 Comm: syz-executor2 Not tainted 4.4.120-gd63fdf6 #29
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 3b5df311781a19eb ffff8800b6587a40 ffffffff81d0408d
 ffffea00074a2980 ffff8801d28a61c0 0000000000000000 ffff8801d28a61c0
 ffff8800b6d90238 ffff8800b6587a78 ffffffff814fe143 ffff8801d28a61c0
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
 [<ffffffff81006d91>] do_syscall_32_irqs_on arch/x86/entry/common.c:392 [inline]
 [<ffffffff81006d91>] do_fast_syscall_32+0x321/0x8a0 arch/x86/entry/common.c:459
 [<ffffffff837752ea>] sysenter_flags_fixed+0xd/0x17

Allocated by task 9773:
 [<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
 [<ffffffff81558917>] fasync_alloc fs/fcntl.c:607 [inline]
 [<ffffffff81558917>] fasync_add_entry fs/fcntl.c:665 [inline]
 [<ffffffff81558917>] fasync_helper+0x37/0xb0 fs/fcntl.c:694
 [<ffffffff81fa325a>] random_fasync+0x2a/0x40 drivers/char/random.c:1587
 [<ffffffff81559f81>] ioctl_fioasync fs/ioctl.c:511 [inline]
 [<ffffffff81559f81>] do_vfs_ioctl+0x981/0xee0 fs/ioctl.c:576
 [<ffffffff8161e99e>] C_SYSC_ioctl fs/compat_ioctl.c:1614 [inline]
 [<ffffffff8161e99e>] compat_SyS_ioctl+0x64e/0x2540 fs/compat_ioctl.c:1544
 [<ffffffff81006d91>] do_syscall_32_irqs_on arch/x86/entry/common.c:392 [inline]
 [<ffffffff81006d91>] do_fast_syscall_32+0x321/0x8a0 arch/x86/entry/common.c:459
 [<ffffffff837752ea>] sysenter_flags_fixed+0xd/0x17

Freed by task 9794:
 [<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
 [<ffffffff8155649d>] fasync_free_rcu+0x1d/0x20 fs/fcntl.c:566
 [<ffffffff812950d4>] __rcu_reclaim kernel/rcu/rcu.h:118 [inline]
 [<ffffffff812950d4>] rcu_do_batch kernel/rcu/tree.c:2705 [inline]
 [<ffffffff812950d4>] invoke_rcu_callbacks kernel/rcu/tree.c:2973 [inline]
 [<ffffffff812950d4>] __rcu_process_callbacks kernel/rcu/tree.c:2940 [inline]
 [<ffffffff812950d4>] rcu_process_callbacks+0x7f4/0x14a0 kernel/rcu/tree.c:2957
 [<ffffffff83776e57>] __do_softirq+0x227/0xa38 kernel/softirq.c:273

The buggy address belongs to the object at ffff8801d28a6180
 which belongs to the cache fasync_cache of size 96
The buggy address is located 64 bytes inside of
 96-byte region [ffff8801d28a6180, ffff8801d28a61e0)
The buggy address belongs to the page:
INFO: trying to register non-static key.
the code is fine but needs lockdep annotation.
turning off the locking correctness validator.
CPU: 0 PID: 3857 Comm: syz-executor0 Not tainted 4.4.120-gd63fdf6 #29
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 6d1b84cefc86e9a6 ffff8800ba9279d0 ffffffff81d0408d
 ffffffff8514e270 0000000000000000 ffff8801d8d1e000 ffff8800b639aa38
 0000000000000000 ffff8800ba9279e0 ffffffff8141adb3 ffff8800ba927b88
Call Trace:
 [<ffffffff81d0408d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d0408d>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff8141adb3>] register_lock_class.part.26+0x32/0x36 kernel/locking/lockdep.c:762
 [<ffffffff8123ae59>] register_lock_class kernel/locking/lockdep.c:767 [inline]
 [<ffffffff8123ae59>] __lock_acquire+0x3a49/0x4b50 kernel/locking/lockdep.c:3101
 [<ffffffff8123d7ce>] lock_acquire+0x15e/0x460 kernel/locking/lockdep.c:3592
 [<ffffffff83772ad6>] __raw_spin_lock include/linux/spinlock_api_smp.h:144 [inline]
 [<ffffffff83772ad6>] _raw_spin_lock+0x36/0x50 kernel/locking/spinlock.c:151
 [<ffffffff815681d0>] spin_lock include/linux/spinlock.h:302 [inline]
 [<ffffffff815681d0>] fast_dput fs/dcache.c:677 [inline]
 [<ffffffff815681d0>] dput.part.19+0x3b0/0x760 fs/dcache.c:784
 [<ffffffff8156859f>] dput+0x1f/0x30 fs/dcache.c:777
 [<ffffffff8153b131>] path_put+0x31/0x70 fs/namei.c:505
 [<ffffffff815bf676>] free_fs_struct+0x16/0x60 fs/fs_struct.c:89
 [<ffffffff815c02f1>] exit_fs+0xe1/0x120 fs/fs_struct.c:108
 [<ffffffff81132f03>] do_exit+0x803/0x2a10 kernel/exit.c:751
 [<ffffffff811393c8>] do_group_exit+0x108/0x320 kernel/exit.c:885
 [<ffffffff811395fd>] SYSC_exit_group kernel/exit.c:896 [inline]
 [<ffffffff811395fd>] SyS_exit_group+0x1d/0x20 kernel/exit.c:894
 [<ffffffff81006d91>] do_syscall_32_irqs_on arch/x86/entry/common.c:392 [inline]
 [<ffffffff81006d91>] do_fast_syscall_32+0x321/0x8a0 arch/x86/entry/common.c:459
 [<ffffffff837752ea>] sysenter_flags_fixed+0xd/0x17
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: 0 PID: 3857 Comm: syz-executor0 Not tainted 4.4.120-gd63fdf6 #29
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d8d1e000 task.stack: ffff8800ba920000
RIP: 0010:[<ffffffff81d16406>]  [<ffffffff81d16406>] ____rb_erase_color lib/rbtree.c:263 [inline]
RIP: 0010:[<ffffffff81d16406>]  [<ffffffff81d16406>] rb_erase+0x626/0x1b60 lib/rbtree.c:429
RSP: 0018:ffff8801db207d38  EFLAGS: 00010003
RAX: ffff8801c712fe00 RBX: ffff8801c712fdf8 RCX: 0a0508a8e82a0be9
RDX: ffffed003b6432e2 RSI: ffff8801db219710 RDI: ffffffff838a9068
RBP: ffff8801db207d80 R08: 1ffff1003b0ef73e R09: 0000000000000000
R10: 0000000000000000 R11: 1ffff1003b640f6a R12: dffffc0000000000
R13: ffffffff838a9060 R14: 2862616c53656761 R15: 5028454741505f4e
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000000420c000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801db219c40 0000000041b58ab3 ffffffff83fce929 ffffffff81d65e60
 ffff8801db219c40 ffff8801db219710 ffff8801db219718 0000000000000000
 0000000000000000 ffff8801db207db0 ffffffff81d21b68 dffffc0000000000
Call Trace:
 <IRQ> 
 [<ffffffff81d21b68>] timerqueue_del+0x78/0x170 lib/timerqueue.c:86
 [<ffffffff812ac580>] __remove_hrtimer+0x90/0x250 kernel/time/hrtimer.c:916
 [<ffffffff812ad858>] __run_hrtimer kernel/time/hrtimer.c:1241 [inline]
 [<ffffffff812ad858>] __hrtimer_run_queues+0x238/0xfe0 kernel/time/hrtimer.c:1324
 [<ffffffff812afe06>] hrtimer_interrupt+0x1a6/0x440 kernel/time/hrtimer.c:1358
 [<ffffffff810b0dea>] local_apic_timer_interrupt+0x6a/0xb0 arch/x86/kernel/apic/apic.c:901
 [<ffffffff837765b6>] smp_apic_timer_interrupt+0x76/0xa0 arch/x86/kernel/apic/apic.c:925
 [<ffffffff83775510>] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:737
 <EOI> 
 [<ffffffff83772ad6>] __raw_spin_lock include/linux/spinlock_api_smp.h:144 [inline]
 [<ffffffff83772ad6>] _raw_spin_lock+0x36/0x50 kernel/locking/spinlock.c:151
 [<ffffffff815681d0>] spin_lock include/linux/spinlock.h:302 [inline]
 [<ffffffff815681d0>] fast_dput fs/dcache.c:677 [inline]
 [<ffffffff815681d0>] dput.part.19+0x3b0/0x760 fs/dcache.c:784
 [<ffffffff8156859f>] dput+0x1f/0x30 fs/dcache.c:777
 [<ffffffff8153b131>] path_put+0x31/0x70 fs/namei.c:505
 [<ffffffff815bf676>] free_fs_struct+0x16/0x60 fs/fs_struct.c:89
 [<ffffffff815c02f1>] exit_fs+0xe1/0x120 fs/fs_struct.c:108
 [<ffffffff81132f03>] do_exit+0x803/0x2a10 kernel/exit.c:751
 [<ffffffff811393c8>] do_group_exit+0x108/0x320 kernel/exit.c:885
 [<ffffffff811395fd>] SYSC_exit_group kernel/exit.c:896 [inline]
 [<ffffffff811395fd>] SyS_exit_group+0x1d/0x20 kernel/exit.c:894
 [<ffffffff81006d91>] do_syscall_32_irqs_on arch/x86/entry/common.c:392 [inline]
 [<ffffffff81006d91>] do_fast_syscall_32+0x321/0x8a0 arch/x86/entry/common.c:459
 [<ffffffff837752ea>] sysenter_flags_fixed+0xd/0x17
Code: f5 4d 8b 76 10 49 8d 7d 08 48 89 f9 48 c1 e9 03 42 80 3c 21 00 0f 85 84 0b 00 00 4d 8b 7d 08 4d 85 ff 74 1c 4c 89 f9 48 c1 e9 03 <42> 80 3c 21 00 0f 85 44 0b 00 00 41 f6 07 01 0f 84 12 06 00 00 
RIP  [<ffffffff81d16406>] ____rb_erase_color lib/rbtree.c:263 [inline]
RIP  [<ffffffff81d16406>] rb_erase+0x626/0x1b60 lib/rbtree.c:429
 RSP <ffff8801db207d38>
---[ end trace b09a5396229184c3 ]---