Page fault - Xen spare directmap

(XEN) [   15.177775] Pagetable walk from ffffc9004025bff8:
(XEN) [   15.178588]  L4[0x192] = 000000024105c067 000000000003efa3
(XEN) [   15.179522]  L3[0x001] = 0000000273e73067 000000000000358d
(XEN) [   15.180454]  L2[0x001] = 0000000273d1f067 00000000000036e1
(XEN) [   15.181382]  L1[0x05b] = 0000000000000000 ffffffffffffffff
(XEN) [   15.182319] domain_crash_sync called from entry.S: fault at ffff82d040398fa0 x86_64/entry.S#domain_crash_page_fault_6x8+0/0x4
(XEN) [   15.184137] Domain 0 (vcpu#0) crashed on cpu#0:
(XEN) [   15.184920] ----[ Xen-4.19-unstable  x86_64  debug=y  Tainted:   C    ]----
(XEN) [   15.186052] CPU:    0
(XEN) [   15.186476] RIP:    e033:[<ffffffff810218a0>]
(XEN) [   15.187215] RFLAGS: 0000000000010202   EM: 1   CONTEXT: pv guest (d0v0)
(XEN) [   15.188301] rax: 0000000000000000   rbx: 00005566f3e322a0   rcx: ffffffff810218a0
(XEN) [   15.189518] rdx: 00007fad1e2738a0   rsi: 00005566f3e32323   rdi: 0000000000000003
(XEN) [   15.190735] rbp: 0000000000000000   rsp: ffffc9004025c000   r8:  0000000000008000
(XEN) [   15.191944] r9:  726f6674616c702f   r10: 0000000000000000   r11: 0000000000000202
(XEN) [   15.193156] r12: 00007fad1e2744a0   r13: 0000000000000040   r14: 0000000000000003
(XEN) [   15.194370] r15: 00005566f3e60ec0   cr0: 0000000080050033   cr4: 0000000000372660
(XEN) [   15.195582] cr3: 000000023a9c7000   cr2: ffffffff810218a0
(XEN) [   15.196478] fsb: 00007fad1dcf38c0   gsb: ffff888035c00000   gss: 0000000000000000
(XEN) [   15.197695] ds: 0000   es: 0000   fs: 0000   gs: 0000   ss: e02b   cs: e033
(XEN) [   15.198823] Guest stack trace from rsp=ffffc9004025c000:
(XEN) [   15.199708]    ffffffff810218a0 0000000000000202 0000000000000010 ffffffff810218a0
(XEN) [   15.200937]    000000010000e030 0000000000010002 ffffc9004025c040 000000000000e02b
(XEN) [   15.202166]    ffffffff810218a0 0000000000000202 0000000000000010 ffffffff810218a0
(XEN) [   15.203393]    000000010000e030 0000000000010002 ffffc9004025c080 000000000000e02b
(XEN) [   15.204621]    ffffffff810218a0 0000000000000202 0000000000000010 ffffffff810218a0
(XEN) [   15.205849]    000000010000e030 0000000000010002 ffffc9004025c0c0 000000000000e02b
(XEN) [   15.207075]    ffffffff810218a0 0000000000000202 0000000000000010 ffffffff810218a0
(XEN) [   15.208313]    000000010000e030 0000000000010002 ffffc9004025c100 000000000000e02b
(XEN) [   15.209540]    ffffffff810218a0 0000000000000202 0000000000000010 ffffffff810218a0
(XEN) [   15.210769]    000000010000e030 0000000000010002 ffffc9004025c140 000000000000e02b
(XEN) [   15.211999]    ffffffff810218a0 0000000000000202 0000000000000010 ffffffff810218a0
(XEN) [   15.213224]    000000010000e030 0000000000010002 ffffc9004025c180 000000000000e02b
(XEN) [   15.214449]    ffffffff810218a0 0000000000000202 0000000000000010 ffffffff810218a0
(XEN) [   15.215676]    000000010000e030 0000000000010002 ffffc9004025c1c0 000000000000e02b
(XEN) [   15.216905]    ffffffff810218a0 0000000000000202 0000000000000010 ffffffff810218a0
(XEN) [   15.218134]    000000010000e030 0000000000010002 ffffc9004025c200 000000000000e02b
(XEN) [   15.219366]    ffffffff810218a0 0000000000000202 0000000000000010 ffffffff810218a0
(XEN) [   15.220592]    000000010000e030 0000000000010002 ffffc9004025c240 000000000000e02b
(XEN) [   15.221823]    ffffffff810218a0 0000000000000202 0000000000000010 ffffffff810218a0
(XEN) [   15.223054]    000000010000e030 0000000000010002 ffffc9004025c280 000000000000e02b