[Bug 232387] head -r339076: system crash in vnet_epair_init during kern_jail_set in a kyua test on powerpc64

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=232387

--- Comment #1 from Mark Millard <marklmi26-fbsd at yahoo.com> ---
vnet_epair_init extraction from objdump --prefix0addresses -d for if_epair.ko :

<vnet_epair_init> addis   r2,r12,2
<vnet_epair_init+0x4> addi    r2,r2,-20768
<vnet_epair_init+0x8> mflr    r0
<vnet_epair_init+0xc> std     r31,-8(r1)
<vnet_epair_init+0x10> std     r29,-24(r1)
<vnet_epair_init+0x14> std     r30,-16(r1)
<vnet_epair_init+0x18> std     r0,16(r1)
<vnet_epair_init+0x1c> stdu    r1,-64(r1)
<vnet_epair_init+0x20> mr      r31,r1
<vnet_epair_init+0x24> mr      r9,r13
<vnet_epair_init+0x28> ld      r9,1240(r9)
<vnet_epair_init+0x2c> addis   r7,r2,-2
<vnet_epair_init+0x30> addis   r6,r2,-2
<vnet_epair_init+0x34> addis   r5,r2,-2
<vnet_epair_init+0x38> addis   r3,r2,-2
<vnet_epair_init+0x3c> addi    r7,r7,20960
<vnet_epair_init+0x40> addi    r6,r6,22096
<vnet_epair_init+0x44> addi    r5,r5,24896
<vnet_epair_init+0x48> li      r4,0
<vnet_epair_init+0x4c> ld      r30,40(r9)
<vnet_epair_init+0x50> nop
<vnet_epair_init+0x54> std     r2,24(r1)
<vnet_epair_init+0x58> addi    r3,r3,31640
<vnet_epair_init+0x5c> nop
<vnet_epair_init+0x60> ld      r12,-32704(r2)
<vnet_epair_init+0x64> addi    r29,r2,-31440
<vnet_epair_init+0x68> mtctr   r12
<vnet_epair_init+0x6c> bctrl
<vnet_epair_init+0x70> ld      r2,24(r1)
<vnet_epair_init+0x74> nop
<vnet_epair_init+0x78> stdx    r3,r29,r30
<vnet_epair_init+0x7c> nop
<vnet_epair_init+0x80> std     r2,24(r1)
<vnet_epair_init+0x84> ld      r12,-32696(r2)
<vnet_epair_init+0x88> addi    r3,r2,-32312
<vnet_epair_init+0x8c> mtctr   r12
<vnet_epair_init+0x90> bctrl
<vnet_epair_init+0x94> ld      r2,24(r1)
<vnet_epair_init+0x98> addi    r1,r31,64
<vnet_epair_init+0x9c> ld      r0,16(r1)
<vnet_epair_init+0xa0> ld      r29,-24(r1)
<vnet_epair_init+0xa4> ld      r30,-16(r1)
<vnet_epair_init+0xa8> ld      r31,-8(r1)
<vnet_epair_init+0xac> mtlr    r0
<vnet_epair_init+0xb0> blr
<vnet_epair_init+0xb4> .long 0x0
<vnet_epair_init+0xb8> .long 0x1
<vnet_epair_init+0xbc> lwz     r0,0(r3)

The crash reported:

Stopped at vnet_epair_init+0x78: stdx r3,r29,r30

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