syzbot

kasan: CONFIG_KASAN_INLINE enabled
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: 1 PID: 17521 Comm: syz-executor6 Not tainted 4.15.0-rc9+ #277
FAULT_FLAG_ALLOW_RETRY missing 30
CPU: 0 PID: 17546 Comm: syz-executor5 Not tainted 4.15.0-rc9+ #277
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
 handle_userfault+0x12fa/0x24c0 fs/userfaultfd.c:427
 do_anonymous_page mm/memory.c:3127 [inline]
 handle_pte_fault mm/memory.c:3941 [inline]
 __handle_mm_fault+0x32a3/0x3ce0 mm/memory.c:4067
 handle_mm_fault+0x334/0x8d0 mm/memory.c:4104
 __do_page_fault+0x5c9/0xc90 arch/x86/mm/fault.c:1430
 do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1505
 page_fault+0x2c/0x60 arch/x86/entry/entry_64.S:1260
RIP: 0010:fault_in_pages_readable include/linux/pagemap.h:601 [inline]
RIP: 0010:iov_iter_fault_in_readable+0x1a7/0x410 lib/iov_iter.c:421
RSP: 0018:ffff8801c652f928 EFLAGS: 00010246
RAX: 0000000000010000 RBX: 0000000020011fd2 RCX: ffffffff82587981
RDX: 00000000000000c9 RSI: ffffc9000437c000 RDI: ffff8801c652fd28
RBP: ffff8801c652fa08 R08: 1ffff100381444ba R09: 0000000000000000
R10: ffff8801c652f858 R11: 0000000000000000 R12: 1ffff10038ca5f28
R13: ffff8801c652f9e0 R14: 0000000000000000 R15: ffff8801c652fd20
 generic_perform_write+0x200/0x600 mm/filemap.c:3129
 __generic_file_write_iter+0x366/0x5b0 mm/filemap.c:3264
 generic_file_write_iter+0x399/0x790 mm/filemap.c:3292
 call_write_iter include/linux/fs.h:1772 [inline]
 new_sync_write fs/read_write.c:469 [inline]
 __vfs_write+0x684/0x970 fs/read_write.c:482
 vfs_write+0x189/0x510 fs/read_write.c:544
 SYSC_write fs/read_write.c:589 [inline]
 SyS_write+0xef/0x220 fs/read_write.c:581
 entry_SYSCALL_64_fastpath+0x29/0xa0
RIP: 0033:0x452f19
RSP: 002b:00007fca3bc3ec58 EFLAGS: 00000212 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452f19
RDX: 0000000000000030 RSI: 0000000020011fd2 RDI: 0000000000000014
RBP: 0000000000000069 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006efa78
R13: 00000000ffffffff R14: 00007fca3bc3f6d4 R15: 0000000000000000
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:native_write_cr4+0x4/0x10 arch/x86/include/asm/special_insns.h:76
RSP: 0018:ffff8801c2357068 EFLAGS: 00010093
RAX: ffff8801bb2da000 RBX: 00000000001606e0 RCX: ffffffff811a32b2
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000001606e0
RBP: ffff8801c2357068 R08: 1ffff1003846ad69 R09: 0000000000000004
R10: ffff8801c2356fd8 R11: 0000000000000005 R12: 0000000000000093
R13: ffff8801bb2da000 R14: ffff8801db31d130 R15: ffff8801db31d130
FS:  00007fc7978ab700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fad07067db8 CR3: 0000000006822002 CR4: 00000000001626e0
Call Trace:
 __write_cr4 arch/x86/include/asm/paravirt.h:76 [inline]
 __cr4_set arch/x86/include/asm/tlbflush.h:252 [inline]
 cr4_clear_bits arch/x86/include/asm/tlbflush.h:275 [inline]
 kvm_cpu_vmxoff arch/x86/kvm/vmx.c:3589 [inline]
 hardware_disable+0x34a/0x4b0 arch/x86/kvm/vmx.c:3595
 kvm_arch_hardware_disable+0x35/0xd0 arch/x86/kvm/x86.c:8004
 hardware_disable_nolock+0x30/0x40 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3310
 on_each_cpu+0xca/0x1b0 kernel/smp.c:604
 hardware_disable_all_nolock+0x3e/0x50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3328
 hardware_disable_all arch/x86/kvm/../../../virt/kvm/kvm_main.c:3334 [inline]
 kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:742 [inline]
 kvm_put_kvm+0x956/0xdf0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:755
 kvm_vm_release+0x42/0x50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:766
 __fput+0x327/0x7e0 fs/file_table.c:210
 ____fput+0x15/0x20 fs/file_table.c:244
 task_work_run+0x199/0x270 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x9bb/0x1ad0 kernel/exit.c:865
 do_group_exit+0x149/0x400 kernel/exit.c:968
 get_signal+0x73f/0x16c0 kernel/signal.c:2335
 do_signal+0x90/0x1eb0 arch/x86/kernel/signal.c:809
 exit_to_usermode_loop+0x214/0x310 arch/x86/entry/common.c:158
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264
 entry_SYSCALL_64_fastpath+0x9e/0xa0
RIP: 0033:0x452f19
RSP: 002b:00007fc7978aac58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010
RAX: fffffffffffffffc RBX: 000000000071bf58 RCX: 0000000000452f19
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000015
RBP: 000000000000023b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f2628
R13: 00000000ffffffff R14: 00007fc7978ab6d4 R15: 0000000000000002
Code: 0f 1f 80 00 00 00 00 55 48 89 e5 0f 20 d8 5d c3 0f 1f 80 00 00 00 00 55 48 89 e5 0f 22 df 5d c3 0f 1f 80 00 00 00 00 55 48 89 e5 <0f> 22 e7 5d c3 0f 1f 80 00 00 00 00 55 48 89 e5 44 0f 20 c0 5d 
RIP: native_write_cr4+0x4/0x10 arch/x86/include/asm/special_insns.h:76 RSP: ffff8801c2357068
---[ end trace 1ef4b4e8e319349d ]---