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

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

--- Comment #6 from Mark Millard <[email protected]> ---
(In reply to Bjoern A. Zeeb from comment #2)

I did a svnlite update -r339341 /usr/src/sys/kern/link_elf.c
and rebuilt, reinstalled, rebooted, and retested based on
using devel/powerpc64-xtoolchain-gcc materials.

Result: Still crashed.

The below has show reg as well.

. . .
epair3a: Ethernet address: 02:60:27:70:4b:0a
epair3b: Ethernet address: 02:60:27:70:4b:0b
epair3a: link state changed to UP
epair3b: link state changed to UP
lock order reversal:
 1st 0x13be260 allprison (allprison) @ /usr/src/sys/kern/kern_jail.c:960
 2nd 0x15964a0 vnet_sysinit_sxlock (vnet_sysinit_sxlock) @
/usr/src/sys/net/vnet.c:575
stack backtrace:
#0 0x6f6520 at witness_debugger+0xf4
#1 0x6f8440 at witness_checkorder+0xa1c
#2 0x675690 at _sx_slock_int+0x70
#3 0x675810 at _sx_slock+0x1c
#4 0x7f4338 at vnet_sysinit+0x38
#5 0x7f44dc at vnet_alloc+0x118
#6 0x62ab84 at kern_jail_set+0x3274
#7 0x62b62c at sys_jail_set+0x8c
#8 0xa8a798 at trap+0x9a0
#9 0xa7e660 at powerpc_interrupt+0x140

fatal kernel trap:

   exception       = 0x300 (data storage interrupt)
   virtual address = 0xc00000008df1df30
   dsisr           = 0x42000000
   srr0            = 0xe00000004784ce98 (0xe00000004784ce98)
   srr1            = 0x9000000000009032
   current msr     = 0x9000000000009032
   lr              = 0xe00000004784ce90 (0xe00000004784ce90)
   curthread       = 0xc00000000b8c8560
          pid = 9536, comm = jail


(Hand transcribed from here on:)

[ thread pid 9536 tid 100174 ]
Stopped at vnet_epair_init+0x78: stdx r3,r29,r30
db:0:kdb.enter.default> bt
Tracing pid 9536 tid 100174 td 0xc00000000b8c8560
0xe000000047274240: at vnet_sysinit+0x70

0xe000000047274270: at vnet_alloc+0x118
0xe000000047274300: at kern_jail_set+0x3274
0xe000000047274610: at sys_jail_set+0x8c
0xe000000047274660: at trap+0x9a0
0xe000000047274790: at powerpc_interrupt+0x140

0xe000000047274820: user sc trap by 0x81016a888
srr1 = 0x900000000000f032
r1   = 0x3fffffffffffd080
cr   = 0x28002482
xer  = 0x20000000
ctr  = 0x81016a880
r2   = 0x810322300
db> show reg
r0   = 0xe00000004784ce90 vnet_epair_init+0x70
r1   = 0xe000000047050200
r2   = 0xe00000004784ce90 .TOC.
r3   = 0xc000000027a3fc00
r4   =                0x4
r5   =           0xe04008
r6   =              0x119
r7   =                  0
r8   = 0xc00000000b8c8560
r9   =                0x2
r10  = 0xc00000000b8c8560
r11  = 0xc00000000b8c86a0
r12  =          0x152f1e8
r13  = 0xc00000000b8c8560
r14  =                  0
r15  =                  0
r16  = 0xc00000000763d960
r17  = 0xc000000008145090
r18  =                  0
r19  = 0xc000000027a45058
r20  =          0x10e3690 prison0
r21  =                  0
r22  =                  0
r23  =                  0
r24  =                  0
r25  = 0xc000000027a45000
r26  =                  0
r27  =          0x11e71b0 __start_set_compressors
r28  = 0xe000000047871000 .TOC.+0x9300
r29  = 0xe000000047860230 vnet_entry_epair_cloner
r30  = 0xe0000000466bdd00
r31  = 0xe000000047050200
srr0 = 0xe00000004784ce98 vnet_epair_init+0x78
srr1 = 0x9000000000009032
lr   = 0xe00000004784ce90 vnet_epair_init+0x70
ctr  =                0x1
cr   =         0x20222234
xer  =                  0
dar  = 0xe00000008df1df30
dsisr=         0x42000000
vnet_epair_init+0x70: stdx r3,r29,r30

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