Code isn't generated:
open-vm-tools/lib/backdoor/backdoorGcc64.c
Backdoor_InOut(Backdoor_proto *myBp) // IN/OUT
{
uint64 dummy;
__asm__ __volatile__(
#ifdef __APPLE__
/*
* Save %rbx on the stack because the Mac OS GCC doesn't want us to
* clobber it - it erroneously thinks %rbx is the PIC register.
* (Radar bug 7304232)
*/
"pushq %%rbx" "\n\t"
#endif
"pushq %%rax" "\n\t"
"movq 40(%%rax), %%rdi" "\n\t"
"movq 32(%%rax), %%rsi" "\n\t"
"movq 24(%%rax), %%rdx" "\n\t"
"movq 16(%%rax), %%rcx" "\n\t"
"movq 8(%%rax), %%rbx" "\n\t"
"movq (%%rax), %%rax" "\n\t"
"inl %%dx, %%eax" "\n\t" /* NB: There is no inq instruction */
"xchgq %%rax, (%%rsp)" "\n\t"
"movq %%rdi, 40(%%rax)" "\n\t"
"movq %%rsi, 32(%%rax)" "\n\t"
"movq %%rdx, 24(%%rax)" "\n\t"
"movq %%rcx, 16(%%rax)" "\n\t"
"movq %%rbx, 8(%%rax)" "\n\t"
"popq (%%rax)" "\n\t"
#ifdef __APPLE__
"popq %%rbx" "\n\t"
#endif
: "=a" (dummy)
: "0" (myBp)
/*
* vmware can modify the whole VM state without the compiler knowing
* it. So far it does not modify EFLAGS. --hpreg
*/
:
#ifndef __APPLE__
/* %rbx is unchanged at the end of the function on Mac OS. */
"rbx",
#endif
"rcx", "rdx", "rsi", "rdi", "memory"
);
}
Last functional change in 2011, so it isn't a change to the crashing
code itself.
The failing instruction is the port-io hypercall
See: http://www.felixcloutier.com/x86/IN.html
It does a 32bit read to EAX from source port defined in DX.
DX is lowest 16 bit of RDX
We have RDX from the crash: rdx 0x7700005658 511101130328
It is that
The error being "dx" suggests that the source port would be wrong?
That would be 0x5658 or in decimal 22104
I don't know the VMware Hipercall interface - is that source port
reasonable?
That is not getting us anywhere without help I assume :-/
I'll post this reading of the call to the upstream bug.
The question is what happens on this hypercall and/or the call to it that
triggers the bug?
I'm afraid we have to wait for a reproducer due to upstream work on it
or one of the affected chiming in here.
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https://bugs.launchpad.net/bugs/1791220
Title:
increased crash rate since 10.3 upgrade is available
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