[Xen-devel] Xen-unstable, stubdom causes hypervisor crash

[Wei Liu <wei.liu2@xxxxxxxxxx>]

I discovered this when running qemu-trad stubdom + shadow page table.

(XEN) Assertion 'pages' failed at vmap.c:275
(XEN) ----[ Xen-4.6-unstable  x86_64  debug=y  Tainted:    C ]----
(XEN) CPU:    1
(XEN) RIP:    e008:[<ffff82d08013d226>] vfree+0x1e/0x128
(XEN) RFLAGS: 0000000000010246   CONTEXT: hypervisor (d2v0)
(XEN) rax: 0000000000000000   rbx: 0000000000000000   rcx: ffff82c0001fff66
(XEN) rdx: 0000000000000000   rsi: 0000000000009bd1   rdi: 0000000000000000
(XEN) rbp: ffff830224857cc8   rsp: ffff830224857c88   r8:  ffff830224857ca4
(XEN) r9:  0000000000000000   r10: ffff82d080261e40   r11: 0000000000000202
(XEN) r12: 0000000000000000   r13: ffff830215672000   r14: 0000000000000000
(XEN) r15: 0000000000000000   cr0: 000000008005003b   cr4: 00000000000026f4
(XEN) cr3: 00000001cb060000   cr2: ffff880012dbd6c8
(XEN) ds: 0000   es: 0000   fs: 0000   gs: 0000   ss: e010   cs: e008
(XEN) Xen stack trace from rsp=ffff830224857c88:
(XEN)    0000000000000000 ffff830224857ca8 ffff82d08012f5c6 0000000000000000
(XEN)    0000000000000000 ffff830215672000 0000000000000000 0000000000000000
(XEN)    ffff830224857d78 ffff82d08021c4ad 0000000000000200 0000000000000005
(XEN)    ffff830224857d58 ffff82d0801620ca ffff830224886020 0000000000000000
(XEN)    0000000000000000 0000000000000000 0000000000000000 0000000000000000
(XEN)    ffff830215672ac0 0000000000000000 0000000000000006 000000200200b004
(XEN)    ffffffffffffffea ffffffffffffffff 0000000000000006 000000200200b004
(XEN)    ffffffffffffffea 0000000000000000 ffff830224857e58 ffff82d0801d4ae0
(XEN)    0000000000000000 0000000000000000 0000000000000001 0000000000000000
(XEN)    ffff830224857db8 ffff830224857dc8 0000000000000202 ffff830224857dd8
(XEN)    ffff830224857dd8 ffff82d08019e6eb ffff830224857e28 ffff82d08019ed8a
(XEN)    ffff83020180a0c8 00000000000ee6c7 ffff830224857e28 ffff830215672000
(XEN)    0000000000000001 0000000000000000 0000000000000000 0000000000000000
(XEN)    ffff830224857f08 ffff8300cf0fc1f8 ffff8300cf0fc000 00000000005ef640
(XEN)    ffff830224850000 0000000000000000 ffff830224857ef8 ffff82d08011bb5f
(XEN)    ffff8300cf0fc200 ffff8300cf0fc208 0000000100000000 ffff8300cf0fc1f8
(XEN)    ffff830224857ea8 ffff82d000a0fb00 0000000000000000 ffffffffffffffff
(XEN)    ffff830224857ec8 ffff82d000000031 ffff82d080320000 ffff82d08031ff80
(XEN)    ffff830224857ef8 ffff8300cf0fc000 00000000005ef640 000000200202e1f0
(XEN)    0000000000000001 000000200201ba18 00007cfddb7a80c7 ffff82d080247bdb
(XEN) Xen call trace:
(XEN)    [<ffff82d08013d226>] vfree+0x1e/0x128
(XEN)    [<ffff82d08021c4ad>] shadow_track_dirty_vram+0x7ca/0x8aa
(XEN)    [<ffff82d0801d4ae0>] do_hvm_op+0x1aec/0x273b
(XEN)    [<ffff82d08011bb5f>] do_multicall+0x257/0x3dc
(XEN)    [<ffff82d080247bdb>] syscall_enter+0xeb/0x145
(XEN)
(XEN)
(XEN) ****************************************
(XEN) Panic on CPU 1:
(XEN) Assertion 'pages' failed at vmap.c:275
(XEN) ****************************************
(XEN)

Any idea what might go wrong?

Wei.

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