[Xen-devel] xen 4.1 kernel Assertion failed at grant_table.c:132

[Manuel Bouyer <bouyer@xxxxxxxxxxxxxxx>]

[please keep me in Cc: as I'm not subscribed to the list ]

Hello,
starting a Ubuntu 12.10 installation in a PV domU
(kernel and initrd from:
ftp://ftp.lip6.fr/pub/linux/distributions/Ubuntu/archive/dists/quantal/main/installer-amd64/current/images/netboot/xen/)
reliably panic the Xen kernel, always at the same place in the boot.
The host is a NetBSD/5.1_STABLE dom0, on top of a Xen 4.1.4 kernel
(with debug turned on). The panic, cut'n'pasted from serial console:
(XEN) Assertion 't->gt_version != 0' failed at grant_table.c:132
(XEN) ----[ Xen-4.1.4  x86_64  debug=y  Not tainted ]----
(XEN) CPU:    0
(XEN) RIP:    e008:[<ffff82c480107673>] shared_entry_header+0xb/0x5c
(XEN) RFLAGS: 0000000000010246   CONTEXT: hypervisor
(XEN) rax: 0000000000000000   rbx: ffff8302296ff000   rcx: ffff830229700010
(XEN) rdx: 0000000000000000   rsi: 0000000000000000   rdi: ffff830229721f40
(XEN) rbp: ffff82c48029fc88   rsp: ffff82c48029fc88   r8:  ffff8301fcb25000
(XEN) r9:  000000021c6f6000   r10: 0000000000000000   r11: ffffffffffffffff
(XEN) r12: 0000000000000000   r13: ffff830229702000   r14: 0000000000000000
(XEN) r15: 0000000000000000   cr0: 000000008005003b   cr4: 00000000000026f0
(XEN) cr3: 0000000228e3b000   cr2: 00007f7ffdfdc000
(XEN) ds: 0017   es: 0017   fs: 0017   gs: 0000   ss: e010   cs: e008
(XEN) Xen stack trace from rsp=ffff82c48029fc88:
(XEN)    ffff82c48029fcc8 ffff82c480107f2c ffff83021ba4e000 ffff830208bde050
(XEN)    ffff830208b88400 ffff83021ba44000 0000000000000000 0000000000000001
(XEN)    ffff82c48029fd08 ffff82c480108012 0000000100000000 0000000000000000
(XEN)    0000000000000001 ffffffff80c3a720 0000000000000000 0000000000000001
(XEN)    ffff82c48029fde8 ffff82c48010b1b0 ffff82c48029fd84 ffff830200000001
(XEN)    ffff82c48029fd70 ffff82c4802dd240 000000018029fd88 ffff83021ba44000
(XEN)    ffff830229702000 000082c400000000 ffff82c4802dd23c 00000000001fcb25
(XEN)    000000000021c6f6 ffff83021ba44000 ffff830229702000 0000100000000000
(XEN)    000000000021c6f6 0000000006587ff0 0000000000000200 0000000000000007
(XEN)    000000000002006e ffff82c48029fdd0 ffff82c480122d21 ffffffffffffffea
(XEN)    ffffffff80c3a720 ffffa000012e2000 ffffa000012e2028 0000000000000001
(XEN)    ffff82c48029fef8 ffff82c48010ce3e ffff8300cfaf6000 ffffa00012668b98
(XEN)    ffff82c48029feb8 00000001801775bd 0000000100000005 ffff830229702000
(XEN)    0000000000000002 ffff82c4802dcf40 000000008014e749 ffff82c480122f64
(XEN)    ffff8302296dddf8 ffff8300cfaf6000 ffff82c400000003 ffff82c4801856d7
(XEN)    ffff82c48029ff18 ffffffff80c3a720 ffffa000120eaba0 ffffa000120eaba0
(XEN)    ffff82c48029feb8 ffffa00012668b90 ffffa000120ea7c0 ffffa000120eaba0
(XEN)    ffffa00012668d80 0000000000000000 ffff82c48029fef8 ffff82c48014fad9
(XEN)    ffffa00000000006 ffff8300cfaf6000 ffffa000010aa600 ffffa000012e2000
(XEN)    ffffa000012e2028 0000000000000001 00007d3b7fd600c7 ffff82c48020d108
(XEN) Xen call trace:
(XEN)    [<ffff82c480107673>] shared_entry_header+0xb/0x5c
(XEN)    [<ffff82c480107f2c>] __release_grant_for_copy+0x78/0x18b
(XEN)    [<ffff82c480108012>] __release_grant_for_copy+0x15e/0x18b
(XEN)    [<ffff82c48010b1b0>] gnttab_copy+0x8b2/0x97c
(XEN)    [<ffff82c48010ce3e>] do_grant_table_op+0x114a/0x1864
(XEN)    [<ffff82c48020d108>] syscall_enter+0xc8/0x122


The attached patch seems to fix the problem for me, but I'm not sure
at all that it's correct. Can you please double-check it (or propose
another fix, I'll be happy to test it) ?
thanks

-- 
Manuel Bouyer <bouyer@xxxxxxxxxxxxxxx>
     NetBSD: 26 ans d'experience feront toujours la difference
--

Attachment: patch-xen_common_grant_table.c
Description: Text document

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