[Xen-devel] Re: BUG: x86-64 VT crash backtrace

[Rik van Riel <riel@xxxxxxxxxx>]

Rik van Riel wrote:

> here is the x86-64 VT crash backtrace, as promised.  I can trigger it 
> within minutes by simply starting up a 64 bit VT domain on a 64 bit system.
And another, more creative one.  It seems to have bitmap_subset
in common with the first backtrace, and the assertion looks like
it could be a useful hint:

(XEN) (file=extable.c, line=77) Pre-exception: ffff830000153d1d -> 
0000000000000000
(XEN) ----[ Xen-3.0-unstable    Not tainted ]----
(XEN) CPU:    0
(XEN) RIP:    e010:[<ffff830000153d1d>] bitmap_subset+0x30/0x9d
(XEN) RFLAGS: 0000000000010046   CONTEXT: hypervisor
(XEN) rax: fffffffffffffffc   rbx: ffff8300002230b8   rcx: 0000000000000000
(XEN) rdx: 0000000000000002   rsi: ffff83000024db08   rdi: ffff830000223060
(XEN) rbp: ffff830000223018   rsp: ffff830000222fe8   r8:  0000000000000000
(XEN) r9:  70202020200a0a3b   r10: 542e2220746e6972   r11: 6d202020200a3b29
(XEN) r12: ffffffff804bc220   r13: 000001000d3f4e20   r14: ffffffff804bc1a0
(XEN) r15: 000000629838fcd8   cr0: 000000008005003b   cr3: 0000000009137000
(XEN) ds: 0000   es: 0000   fs: 0000   gs: 0000   ss: 0000   cs: e010
(XEN) Xen stack trace from rsp=ffff830000222fe8:
(XEN)   (file=extable.c, line=77) Pre-exception: ffff83000015773e -> 
0000000000000000
(XEN) Assertion 'diff < STACK_SIZE' failed, line 38, file traps.c
(XEN) BUG at traps.c:38
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bca48 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bc820 -> 
0000000000000000
(XEN) Assertion 'diff < STACK_SIZE' failed, line 38, file traps.c
(XEN) BUG at traps.c:38
(XEN) (file=extable.c, line=77) Pre-exception: ffff8300001bca48 -> 
0000000000000000
(XEN) ----[ Xen-3.0-unstable    Not tainted ]----
(XEN) CPU:    2196608
(XEN) RIP:    e010:[<ffff8300001bca48>] show_registers+0x264/0x752
(XEN) RFLAGS: 0000000000010086   CONTEXT: hypervisor
(XEN) rax: ffff8300001e70e4   rbx: ffff8300002230b8   rcx: 00000000000032dc
(XEN) rdx: 0000000000000000   rsi: 000000000000000a   rdi: ffff8300001e70e4
(XEN) rbp: ffff830000218098   rsp: ffff830000217f08   r8:  00000000ffffffff
(XEN) r9:  00000000ffffffff   r10: ffff83000022ed3f   r11: ffff83000022e94f
(XEN) r12: ffffffff804bc220   r13: 000001000d3f4e20   r14: ffffffff804bc1a0
(XEN) r15: 000000629838fcd8   cr0: 000000008005003b   cr3: 0000000009137000
(XEN) ds: 0000   es: 0000   fs: 0000   gs: 0000   ss: 0000   cs: e010
(XEN) Xen stack trace from rsp=ffff830000217f08:
(XEN)    0000000a00000000 ffff8300001e71a0 0000000000000000 ffff830000218108
(XEN)    ffff830000217f58 ffff83000012cd48 0000000a00000000 ffff8300001e71a0
(XEN)    ffff830000217fe8 ffff8300001e7214 ffff830000217f98 0000000000000082
(XEN)    ffff8300001d0a1a 000000080000004d 0000000a00000009 ffff8300001e71a0
(XEN)    000000629838fcd8 ffffffff804bc1a0 000001000d3f4e20 ffffffff804bc220
(XEN)    ffff830000218348 ffff8300002230b8 ffff83000022e956 ffff83000022e97d
(XEN)    00000000ffffffff 0000000000000010 0000000a00000009 0000000000000000
(XEN)    00000000000000c8 ffff830000218480 ffff830000218300
(XEN) Xen call trace:
(XEN)    [<ffff8300001bca48>] show_registers+0x264/0x752
(XEN)
(XEN) ************************************
(XEN) CPU2196608 FATAL TRAP 6 (invalid opcode), ERROR_CODE 0000, IN 
INTERRUPT CONTEXT.
(XEN) System shutting down -- need manual reset.
(XEN) ************************************


--
"Debugging is twice as hard as writing the code in the first place.
Therefore, if you write the code as cleverly as possible, you are,
by definition, not smart enough to debug it." - Brian W. Kernighan

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