audit: type=1400 audit(1602692636.739:8): avc:  denied  { execmem } for  pid=6346 comm="syz-executor926" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 6346 Comm: syz-executor926 Not tainted 4.14.198-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880981aa440 task.stack: ffff888086248000
RIP: 0010:vhost_umem_interval_tree_iter_first drivers/vhost/vhost.c:53 [inline]
RIP: 0010:vhost_del_umem_range drivers/vhost/vhost.c:971 [inline]
RIP: 0010:vhost_process_iotlb_msg drivers/vhost/vhost.c:1042 [inline]
RIP: 0010:vhost_chr_write_iter drivers/vhost/vhost.c:1071 [inline]
RIP: 0010:vhost_chr_write_iter+0x863/0x10f0 drivers/vhost/vhost.c:1055
RSP: 0018:ffff88808624fc00 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff888087500180 RCX: 0000000000000000
RDX: 0000000000000002 RSI: ffffffff8a1371d0 RDI: ffff888087500240
RBP: ffffed1010ea0041 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: ffff8880981aa440 R12: 0000000000000002
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff11010c49f87
FS:  0000000000da5880(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200001c0 CR3: 000000008b739000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 call_write_iter include/linux/fs.h:1778 [inline]
 new_sync_write fs/read_write.c:469 [inline]
 __vfs_write+0x44c/0x630 fs/read_write.c:482
 vfs_write+0x17f/0x4d0 fs/read_write.c:544
 SYSC_write fs/read_write.c:590 [inline]
 SyS_write+0xf2/0x210 fs/read_write.c:582
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x440279
RSP: 002b:00007ffe6002ead8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440279
RDX: 0000000000000048 RSI: 0000000020000140 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a80
R13: 0000000000401b10 R14: 0000000000000000 R15: 0000000000000000
Code: ff df 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 cd 06 00 00 4c 8b ab c0 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 e9 48 c1 e9 03 <80> 3c 01 00 0f 85 96 06 00 00 49 8b 6d 00 48 85 ed 0f 84 e4 03 
RIP: vhost_umem_interval_tree_iter_first drivers/vhost/vhost.c:53 [inline] RSP: ffff88808624fc00
RIP: vhost_del_umem_range drivers/vhost/vhost.c:971 [inline] RSP: ffff88808624fc00
RIP: vhost_process_iotlb_msg drivers/vhost/vhost.c:1042 [inline] RSP: ffff88808624fc00
RIP: vhost_chr_write_iter drivers/vhost/vhost.c:1071 [inline] RSP: ffff88808624fc00
RIP: vhost_chr_write_iter+0x863/0x10f0 drivers/vhost/vhost.c:1055 RSP: ffff88808624fc00
---[ end trace 7c60d0cb52da2d86 ]---