[Xen-devel] Assert failure at paging.c:272

["Li, Xin B" <xin.b.li@xxxxxxxxx>]

On changeset 16395 with debug on, I got:
(XEN) Scrubbing Free RAM: ..done.
(XEN) Xen trace buffers: disabled
(XEN) Std. Loglevel: All
(XEN) Guest Loglevel: All
(XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to switch
input to Xen
)
(XEN) Freed 128kB init memory.
(XEN) Assertion '(mfn_x(d->arch.paging.log_dirty.top) < max_page)'
failed at paging.c:272
(XEN) ----[ Xen-3.2-unstable  x86_64  debug=y  Not tainted ]----
(XEN) CPU:    0
(XEN) RIP:    e008:[<ffff828c801905f9>] paging_mark_dirty+0x32/0x302
(XEN) RFLAGS: 0000000000010286   CONTEXT: hypervisor
(XEN) rax: 000000000007dbbe   rbx: ffff83007cc92100   rcx:
00000000000026b0
(XEN) rdx: 00000000e8000000   rsi: 0000000000078201   rdi:
ffff83007cc92100
(XEN) rbp: ffff828c80247dc8   rsp: ffff828c80247d78   r8:
ffff828c802192c0
(XEN) r9:  0000000000000040   r10: ffff828c801e8970   r11:
0000000000000246
(XEN) r12: 0000000000078201   r13: ffff8284012c5028   r14:
0000000080000000
(XEN) r15: ffff83007cc92100   cr0: 000000008005003b   cr4:
00000000000026b0
(XEN) cr3: 0000000079031000   cr2: 0000000000000000
(XEN) ds: 0000   es: 0000   fs: 0000   gs: 0000   ss: e010   cs: e008
(XEN) Xen stack trace from rsp=ffff828c80247d78:
(XEN)    ffff828c80247db8 0000000000000206 0000000578205067
ffff828c80247f28
(XEN)    0000000000000000 ffff8284012c5028 0000000080000000
ffff8284012c5028
(XEN)    0000000080000000 ffff83007cc92100 ffff828c80247de8
ffff828c80142a4b
(XEN)    00000000e8000000 0000000080000001 ffff828c80247e48
ffff828c8014320d
(XEN)    0000000000000286 ffff83007ca1e100 0000000004311afa
ffff8284012c5040
(XEN)    0000000000000001 0000000080000000 ffff8284012c5028
ffff8284012c5028
(XEN)    ffffffff805d9f70 0000000000000000 ffff828c80247e68
ffff828c8013ed29
(XEN)    0000000000078201 ffff83007cc92100 ffff828c80247f08
ffff828c80143e39
(XEN)    ffff83007ca1e100 0000000000000001 00007ff000000000
0000000000000000
(XEN)    000000017cc92100 0000000000000000 ffff828c80247f08
0000000000000001
(XEN)    0000000000000003 0000000000078201 0000000000000000
0000000079035067
(XEN)    0000000000079035 ffff83007ca1e100 0000000000000000
0000000000000000
(XEN)    0000000000000000 0000000000000000 00007d737fdb80b7
ffff828c801bc1bf
(XEN)    ffffffff8020634a 000000000000001a 0000000000000000
0000000000000000
(XEN)    0000000000000000 0000000000000000 ffffffff80599000
0000000080000000
(XEN)    0000000000000246 0000000000007ff0 0000000000000000
0000000000000000
(XEN)    000000000000001a ffffffff8020634a 0000000000000000
0000000000000001
(XEN)    ffffffff805d9f70 0000010000000000 ffffffff8020634a
000000000000e033
(XEN)    0000000000000246 ffffffff805d9f58 000000000000e02b
0000000000000000
(XEN)    0000000000000000 0000000000000000 0000000000000000
0000000000000000
(XEN) Xen call trace:
(XEN)    [<ffff828c801905f9>] paging_mark_dirty+0x32/0x302
(XEN)    [<ffff828c80142a4b>] alloc_page_type+0x54/0x12f
(XEN)    [<ffff828c8014320d>] get_page_type+0x37e/0x46d
(XEN)    [<ffff828c8013ed29>] get_page_and_type_from_pagenr+0x35/0xae
(XEN)    [<ffff828c80143e39>] do_mmuext_op+0x5a6/0x10f3
(XEN)    [<ffff828c801bc1bf>] tracing_off+0xb/0x65
(XEN)    
(XEN) 
(XEN) ****************************************
(XEN) Panic on CPU 0:
(XEN) Assertion '(mfn_x(d->arch.paging.log_dirty.top) < max_page)'
failed at pag
ing.c:272
(XEN) ****************************************
(XEN) 
(XEN) Reboot in five seconds...

Seems the assert there is not necessary, right?
-Xin

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