[Bug 241728] linuxkpi: panics after loading radeonkms kernel module (data storage interrupt trap)

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

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

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

--- Comment #19 from Mark Millard <marklmi26-fbsd at yahoo.com> ---
(In reply to Piotr Kubaj from comment #18)

I got a little time with access to the PowerMac11,2 and have
produced a "kldload linuxkpi" crash on a system built with:

# cc -v
FreeBSD clang version 8.0.1 (tags/RELEASE_801/final 366581) (based on LLVM
8.0.1)
Target: powerpc64-unknown-freebsd13.0
Thread model: posix
InstalledDir: /usr/bin

# uname -apKU
FreeBSD FBSDG5L2 13.0-CURRENT FreeBSD 13.0-CURRENT #19 r352341M: Sat Sep 14
19:40:27 PDT 2019    
markmi at FBSDFHUGE:/usr/obj/powerpc64vtsc_clang_altbinutils/powerpc.powerpc64/usr/src/powerpc.powerpc64/sys/GENERIC64vtsc-NODBG
 powerpc powerpc64 1300047 1300047

It was built using devel/powerpc64-binutils (the "altbinutils"). It is
also a non-debug build, but with symbols.

Despite other differences with your backtrace, both identify idr_preload_init .

Typed from a picture (so subject to typos):

fatal kernel trap:
exception       = 0x300 (data storage interrupt)
virtual address = 0x8e076000
dsidr           = 0x42000000
srr0            = 0xe00000008f4aec8c (0x200000008f3aec8c) (f4 vs. f3 is not a
typo)
srr1            = 0x9000000000009032
current msr     = 0x0000000000009032
lr              = 0xc000000000832470 (0x732470)
frame           = 0xe0000000900aeed0
curthread       = 0xc00000000e086000
pid = 1256, comm = kldload

panic: data storage interrupt
cpuid = 0
time = 1573434333
KDB: stack backtrace
0xe0000000900aec00: at aiocb32_store_status+0x34
0xe0000000900aecb0: at panic+0x44
0xe0000000900aece0: at trap_fatal+0x2f4
0xe0000000900aed70: at trap+0x5d8
0xe0000000900aee50: at powerpc_interrupt+0x1a0
0xe0000000900aeea0: at kernel DSI write trap @0x8e076000
                    by idr_preload_init+0xa4
                    srr1 = 0x9000000000009032
                    r1   = 0xe0000000900af150
                    cr   = 0x4880fc88
                    xer  = 0
                    ctr  = 0xe00000008f4aebe8
                    r2   = 0xe00000008f4d6300
                    frame= 0xe0000000900aeed0
0xe0000000900af150: at 0xc00000000e085ffc
0xe0000000900af1c0: at sem_prison_check+0x170
0xe0000000900af5f0: at kern_kldload+0x158
0xe0000000900af660: at sys_kldload+0x8c
0xe0000000900af6b0: at trap+0xe68
0xe0000000900af790: at powerpc_interrupt+0x1a0
0xe0000000900af7e0: user SC trap
                    by 0x8100e9158
                    srr1 = 0x900000000200f032
                    r1   = 0x3fffffffffffd470
                    cr   = 0x22222800
                    xer  = 0x20000000
                    ctr  = 0x8100e9150
                    r2   = 0x8102a2400
                    frame= 0xe0000000900af810
KDB: enter: panic
[ thread pid 1256 tid 100172 ]
Stopped at ifaddr_byindex+0xc orl r0,r0,0x0

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