[Bug 222314] ifconfig epair create panics the kernel (arm64)

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222314

Mark Millard <marklmi26-fbsd at yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |marklmi26-fbsd at yahoo.com

--- Comment #4 from Mark Millard <marklmi26-fbsd at yahoo.com> ---
A powerpc64 head -r339076 based context running

# kyua test -k /usr/tests/Kyuafile

reliably crashes (so far) during kyua displaying:

sys/netinet/reuseport_lb:basic_ipv4  ->  failed:
/usr/src/tests/sys/netinet/reuseport_lb.c:165: bind() failed: Address already
in use [0.013s]
sys/netinet/reuseport_lb:basic_ipv6  ->  failed:
/usr/src/tests/sys/netinet/reuseport_lb.c:221: bind() failed: Address already
in use [0.013s]
sys/netipsec/tunnel/aes_cbc_128_hmac_sha1:v4  ->  

Example details based on a debug kernel (invariants,
witness, and diagnostics) . . .

Note the LOR backtrace and the crash backtrace
are the same for the call chain that calls
vnet_sysinit.

. . .
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            = 0xe000000047854e98 (0xe000000047854e98)
  srr1            = 0x9000000000009032
  current msr     = 0x9000000000009032
  lr              = 0xe000000047854e90 (0xe000000047854e90)
  curthread       = 0xc0000000206b6000
         pid = 9464, comm = jail

(Hand transcribed from here on:)

[ thread pid 9464 tid 100296 ]
Stopped at vnet_epair_init+0x78: stdx r3,r29,r30
db:0:kdb.enter.default> bt
Tracing pid 9464 tid 100296 td 0xc0000000206b6000
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



There are past reports of the lock order
reversal, such as:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210907

but this did not report any crash.

Notes:

The powerpc64 -r339076 based system was built via
devel/powerpc-xtoolchain-gcc and created
system-cc-is-clang and is using base/binutils as
well. kyua is as of ports -r480180 and system-clang
built it (and other things).

I experiment with what the issues are with using
fairly modern compiler toolchains for powerpc64
instead of gcc 4.2.1 . At this point I do not
see this as likely to be responsible for the
above crash.

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