[Bug 241728] linuxkpi: panics after loading

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241728

            Bug ID: 241728
           Summary: linuxkpi: panics after loading
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: pkubaj at FreeBSD.org

I'm on head on powerpc64 elfv2 (r353588) and experience kernel panic after
kldload radeonkms. I found it's due to linuxkpi.
root at talos:~ # kldload radeonkms.ko

fatal kernel trap:

   exception       = 0x300 (data storage interrupt)
   virtual address = 0xcaa24580
   dsisr           = 0x42000000
   srr0            = 0xe0000000ce3e5dc4 (0x20000000cbf95dc4)
   srr1            = 0x9000000000009032
   current msr     = 0x9000000000009032
   lr              = 0xc000000002cced44 (0x87ed44)
   frame           = 0xe0000000bf08df00
   curthread       = 0xc00000002c43a560
          pid = 47271, comm = kldload

panic: data storage interrupt trap
cpuid = 16
time = 1572942809
KDB: stack backtrace:
0xe0000000bf08da80: at kdb_backtrace+0x60
0xe0000000bf08db90: at vpanic+0x1d8
0xe0000000bf08dc40: at panic+0x40
0xe0000000bf08dc70: at trap+0x1564
0xe0000000bf08dd00: at trap+0x62c
0xe0000000bf08de40: at powerpc_interrupt+0x1b8
0xe0000000bf08ded0: kernel DSI write trap @ 0xcaa24580 by
idr_preload_init+0xc8: srr1=0x9000000000009032
            r1=0xe0000000bf08e180 cr=0x4488dc88 xer=0 ctr=0xc000000002ce7190
r2=0xe0000000ce401ed0 sr=0x42000000 frame=0xe0000000bf08df00
0xe0000000bf08e180: at 0xe0000000ce3c3a04
0xe0000000bf08e1f0: at linker_reference_module+0xfd4
0xe0000000bf08e630: at linker_load_dependencies+0x2b0
0xe0000000bf08e710: at elf_get_symname+0x132c
0xe0000000bf08e960: at linker_reference_module+0xc88
0xe0000000bf08eda0: at linker_load_dependencies+0x2b0
0xe0000000bf08ee80: at elf_get_symname+0x132c
0xe0000000bf08f0d0: at linker_reference_module+0xc88
0xe0000000bf08f510: at kern_kldload+0x138
0xe0000000bf08f5c0: at sys_kldload+0x8c
0xe0000000bf08f610: at trap+0xd58
0xe0000000bf08f750: at powerpc_interrupt+0x1b8
0xe0000000bf08f7e0: user SC trap by 0x810102f20: srr1=0x900000000200d032
            r1=0x3fffffffffffd460 cr=0x44222b80 xer=0 ctr=0x810102f10
r2=0x8102a2398 frame=0xe0000000bf08f810
KDB: enter: panic
[ thread pid 47271 tid 100787 ]
Stopped at      kdb_enter+0x78: ori     r0, r0, 0x0
db> kldstat
Id Refs Address            Size     Name
 1   21 0xc000000002550100 1a611c8  kernel
 2    1 0xe0000000c1900000 22000    tmpfs.ko
 3    1 0xe0000000c4640000 21000    icee.ko
 4    1 0xe0000000c5480000 21000    mac_ntpd.ko
 5    1 0xe0000000c7820000 21000    imgact_binmisc.ko
 6    1 0xe0000000ce600000 1e8000   radeonkms.ko
 7    1 0xe0000000ce300000 c9000    drm.ko
 8    1 0xe0000000ce3c9000 33000    linuxkpi.ko

You can see it's caused by idr_preload_init, at offset 0xe0000000ce3e5dc4
(srr0) - 0xe0000000ce3c9000 (address of linuxkpi.ko) = 0x1d00, which is this
file:
sys/compat/linuxkpi/common/src/linux_idr.c, line:
118                         free(cacheval, M_IDR);

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