kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 3 PID: 8756 Comm: syz-executor3 Not tainted 4.13.0-next-20170907+ #17
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
task: ffff880039c8c180 task.stack: ffff88003dd38000
RIP: 0010:__hlist_del include/linux/list.h:650 [inline]
RIP: 0010:detach_timer kernel/time/timer.c:791 [inline]
RIP: 0010:expire_timers kernel/time/timer.c:1309 [inline]
RIP: 0010:__run_timers+0x619/0xb90 kernel/time/timer.c:1620
RSP: 0018:ffff88006df07968 EFLAGS: 00010806
RAX: 1bd5a00000000041 RBX: ffff88004bf6ba00 RCX: 1ffff1000dbe0f76
RDX: ffff88006df07bb0 RSI: 0000000000000008 RDI: dead000000000208
RBP: ffff88006df07c58 R08: ffff88006df072b8 R09: ffff88006df072b0
R10: ffff88006df07228 R11: 1ffff10007391ac3 R12: ffff88004bf6ba08
R13: dffffc0000000000 R14: dead000000000200 R15: ffff88006df07c30
FS:  00007fc18cf5c700(0000) GS:ffff88006df00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f69e2467000 CR3: 000000006b62e000 CR4: 00000000000026e0
Call Trace:
 <IRQ>
 run_timer_softirq+0x4c/0xb0 kernel/time/timer.c:1646
 __do_softirq+0x2bb/0xbd0 kernel/softirq.c:284
 invoke_softirq kernel/softirq.c:364 [inline]
 irq_exit+0x1d3/0x210 kernel/softirq.c:405
 exiting_irq arch/x86/include/asm/apic.h:638 [inline]
 smp_apic_timer_interrupt+0x177/0x710 arch/x86/kernel/apic/apic.c:1048
==================================================================
BUG: KASAN: use-after-free in __collect_expired_timers include/linux/list.h:729 [inline]
BUG: KASAN: use-after-free in collect_expired_timers kernel/time/timer.c:1569 [inline]
BUG: KASAN: use-after-free in __run_timers+0xa2e/0xb90 kernel/time/timer.c:1616
Write of size 8 at addr ffff880049ae3b48 by task syz-executor4/8776

 apic_timer_interrupt+0x9d/0xb0 arch/x86/entry/entry_64.S:577
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:814 [inline]
RIP: 0010:lock_acquire+0x256/0x580 kernel/locking/lockdep.c:4005
RSP: 0018:ffff88003dd3ef78 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10
RAX: dffffc0000000000 RBX: ffff880039c8c180 RCX: 0000000000000000
RDX: 1ffffffff0b59305 RSI: ffffffff819561d8 RDI: 0000000000000282
RBP: ffff88003dd3f070 R08: ffff88003dd3e9f0 R09: ffff88003dd3e9e8
R10: ffff88003dd3e960 R11: 1ffff10007391ac3 R12: 1ffff10007ba7df5
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001
 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151
 spin_lock include/linux/spinlock.h:316 [inline]
 pte_alloc_one_map mm/memory.c:3246 [inline]
 alloc_set_pte+0x1162/0x18f0 mm/memory.c:3374
 filemap_map_pages+0x1080/0x15d0 mm/filemap.c:2529
 do_fault_around mm/memory.c:3541 [inline]
 do_read_fault mm/memory.c:3575 [inline]
 do_fault mm/memory.c:3680 [inline]
 handle_pte_fault mm/memory.c:3910 [inline]
 __handle_mm_fault+0x1f57/0x39c0 mm/memory.c:4034
 handle_mm_fault+0x334/0x8d0 mm/memory.c:4071
 faultin_page mm/gup.c:502 [inline]
 __get_user_pages+0x4f8/0x15f0 mm/gup.c:699
 populate_vma_page_range+0x20e/0x2f0 mm/gup.c:1152
 __mm_populate+0x23a/0x450 mm/gup.c:1202
 mm_populate include/linux/mm.h:2160 [inline]
 vm_mmap_pgoff+0x241/0x280 mm/util.c:338
 SYSC_mmap_pgoff mm/mmap.c:1518 [inline]
 SyS_mmap_pgoff+0x23b/0x5f0 mm/mmap.c:1476
 SYSC_mmap arch/x86/kernel/sys_x86_64.c:99 [inline]
 SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:90
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x447299
RSP: 002b:00007fc18cf5bc08 EFLAGS: 00000282 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000000020000000 RCX: 0000000000447299
RDX: 0000000000000003 RSI: 0000000000b36000 RDI: 0000000020000000
RBP: 0000000000000082 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000282 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fc18cf5c9c0 R15: 00007fc18cf5c700
Code: 4d 85 f6 4c 89 32 48 89 95 58 fd ff ff 42 c6 04 28 f8 74 26 e8 79 36 10 00 49 8d 7e 08 48 8b 95 58 fd ff ff 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 0f 85 b5 04 00 00 49 89 56 08 e8 53 36 10 00 4c 
RIP: __hlist_del include/linux/list.h:650 [inline] RSP: ffff88006df07968
RIP: detach_timer kernel/time/timer.c:791 [inline] RSP: ffff88006df07968
RIP: expire_timers kernel/time/timer.c:1309 [inline] RSP: ffff88006df07968
RIP: __run_timers+0x619/0xb90 kernel/time/timer.c:1620 RSP: ffff88006df07968
---[ end trace 6d8becd660f69f23 ]---