urandom_read: 1 callbacks suppressed random: sshd: uninitialized urandom read (32 bytes read) audit: type=1400 audit(1567294352.750:36): avc: denied { map } for pid=6843 comm="syz-executor196" path="/root/syz-executor196614236" dev="sda1" ino=16482 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file 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: 6844 Comm: syz-executor196 Not tainted 4.14.141 #37 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff888096a8c5c0 task.stack: ffff888086a28000 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+0x4a9/0x1260 drivers/vhost/vhost.c:1055 RSP: 0018:ffff888086a2fb90 EFLAGS: 00010246 RAX: 0000000000000002 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff88807e120240 RBP: ffff888086a2fcb0 R08: dffffc0000000000 R09: 0000000000000000 R10: ffff888086a2fb80 R11: ffff888096a8c5c0 R12: ffff88807e124948 R13: 0000000000000000 R14: ffff88807e120180 R15: 0000000000000000 FS: 0000000001ef1880(0000) GS:ffff8880aee00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000006cb090 CR3: 00000000a8047000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: vhost_net_chr_write_iter+0x59/0x70 drivers/vhost/net.c:1365 call_write_iter include/linux/fs.h:1777 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x4a7/0x6b0 fs/read_write.c:482 vfs_write+0x198/0x500 fs/read_write.c:544 SYSC_write fs/read_write.c:590 [inline] SyS_write+0xfd/0x230 fs/read_write.c:582 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x4411f9 RSP: 002b:00007ffef3936e48 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004411f9 RDX: 0000000000000068 RSI: 00000000200002c0 RDI: 0000000000000003 RBP: 00000000006cb018 R08: 00000000004002c8 R09: 00000000004002c8 R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000402020 R13: 00000000004020b0 R14: 0000000000000000 R15: 0000000000000000 Code: ff ff 48 89 f9 48 c1 e9 03 80 3c 11 00 0f 85 9c 0c 00 00 49 8b 8e c0 00 00 00 48 ba 00 00 00 00 00 fc ff df 49 89 cf 48 c1 e9 03 <80> 3c 11 00 0f 85 61 0c 00 00 4d 8b 27 4d 85 e4 0f 84 27 09 00 RIP: vhost_del_umem_range drivers/vhost/vhost.c:971 [inline] RSP: ffff888086a2fb90 RIP: vhost_process_iotlb_msg drivers/vhost/vhost.c:1042 [inline] RSP: ffff888086a2fb90 RIP: vhost_chr_write_iter drivers/vhost/vhost.c:1071 [inline] RSP: ffff888086a2fb90 RIP: vhost_chr_write_iter+0x4a9/0x1260 drivers/vhost/vhost.c:1055 RSP: ffff888086a2fb90 ---[ end trace 1549d34dd8a86b22 ]---