Crash with radeonkms

Anindya Mukherjee anindya49 at hotmail.com
Thu Jan 12 10:08:46 UTC 2017 

I am trying to run X compiled the drm-next and xserver-next-udev branches on a machine with a Radeon 2400XT card. The startx command results in an instant crash. Here is some info from a kgdb run:

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Unread portion of the kernel message buffer:
trap number             = 9
panic: general protection fault
cpuid = 3
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe02325b3fd0
vpanic() at vpanic+0x186/frame 0xfffffe02325b4050
panic() at panic+0x43/frame 0xfffffe02325b40b0
trap_fatal() at trap_fatal+0x322/frame 0xfffffe02325b4100
trap() at trap+0x714/frame 0xfffffe02325b42c0
calltrap() at calltrap+0x8/frame 0xfffffe02325b42c0
--- trap 0x9, rip = 0xffffffff80994524, rsp = 0xfffffe02325b4390, rbp = 0xfffffe02325b43b0 ---
pfs_destroy() at pfs_destroy+0x34/frame 0xfffffe02325b43b0
linsysfs_destroy_class_dir() at linsysfs_destroy_class_dir+0x17/frame 0xfffffe02325b43d0
backlight_class_exit() at backlight_class_exit+0x1b/frame 0xfffffe02325b43f0
_module_run() at _module_run+0x9b/frame 0xfffffe02325b4430
linker_file_unload() at linker_file_unload+0x45f/frame 0xfffffe02325b4490
linker_file_unload() at linker_file_unload+0x603/frame 0xfffffe02325b44f0
linker_file_unload() at linker_file_unload+0x603/frame 0xfffffe02325b4550
link_elf_load_file() at link_elf_load_file+0x44a/frame 0xfffffe02325b46f0
linker_load_module() at linker_load_module+0x9cf/frame 0xfffffe02325b4a00
kern_kldload() at kern_kldload+0xa7/frame 0xfffffe02325b4a40
sys_kldload() at sys_kldload+0x5b/frame 0xfffffe02325b4a70
amd64_syscall() at amd64_syscall+0x2f9/frame 0xfffffe02325b4bf0
Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe02325b4bf0
--- syscall (304, FreeBSD ELF64, sys_kldload), rip = 0x8023f250a, rsp = 0x7fffffffe9f8, rbp = 0x7fffffffea60 ---
Uptime: 51s
Dumping 444 out of 8030 MB:..4%..11%..22%..33%..44%..51%..62%..72%..83%..94%

Reading symbols from /boot/kernel/ums.ko...Reading symbols from /usr/lib/debug//boot/kernel/ums.ko.debug...done.
done.
Loaded symbols for /boot/kernel/ums.ko
Reading symbols from /boot/kernel/uhid.ko...Reading symbols from /usr/lib/debug//boot/kernel/uhid.ko.debug...done.
done.
Loaded symbols for /boot/kernel/uhid.ko
Reading symbols from /boot/kernel/linuxkpi.ko...Reading symbols from /usr/lib/debug//boot/kernel/linuxkpi.ko.debug...done.
done.
Loaded symbols for /boot/kernel/linuxkpi.ko
Reading symbols from /boot/kernel/linux_common.ko...Reading symbols from /usr/lib/debug//boot/kernel/linux_common.ko.debug...done.
done.
Loaded symbols for /boot/kernel/linux_common.ko
#0  doadump (textdump=1) at pcpu.h:222
222             __asm("movq %%gs:%1,%0" : "=r" (td)
(kgdb) bt
#0  doadump (textdump=1) at pcpu.h:222
#1  0xffffffff80a4c545 in kern_reboot (howto=<value optimized out>) at /usr/home/anindya/graphics/freebsd-base-graphics/sys/kern/kern_shutdown.c:386
#2  0xffffffff80a4cb20 in vpanic (fmt=<value optimized out>, ap=<value optimized out>) at /usr/home/anindya/graphics/freebsd-base-graphics/sys/kern/kern_shutdown.c:787
#3  0xffffffff80a4cb63 in panic (fmt=<value optimized out>) at /usr/home/anindya/graphics/freebsd-base-graphics/sys/kern/kern_shutdown.c:710
#4  0xffffffff80eba2f2 in trap_fatal (frame=0xfffffe02325b42d0, eva=0) at /usr/home/anindya/graphics/freebsd-base-graphics/sys/amd64/amd64/trap.c:801
#5  0xffffffff80eb9f74 in trap (frame=0xfffffe02325b42d0) at /usr/home/anindya/graphics/freebsd-base-graphics/sys/amd64/amd64/trap.c:198
#6  0xffffffff80e9aa61 in calltrap () at /usr/home/anindya/graphics/freebsd-base-graphics/sys/amd64/amd64/exception.S:236G
#7  0xffffffff80994524 in pfs_destroy (pn=0xfffff800384a8400) at /usr/home/anindya/graphics/freebsd-base-graphics/sys/fs/pseudofs/pseudofs.c:296
#8  0xffffffff82523697 in linsysfs_destroy_class_dir (class=0xfffff800384b5e00) at /usr/home/anindya/graphics/freebsd-base-graphics/sys/modules/linuxkpi/../../compat/linsysfs/linsysfs_init.c:291
#9  0xffffffff8250a04b in backlight_class_exit () at device.h:349
#10 0xffffffff82509a9b in _module_run (arg=<value optimized out>) at module.h:80
#11 0xffffffff80a20e5f in linker_file_unload (file=<value optimized out>, flags=<value optimized out>) at /usr/home/anindya/graphics/freebsd-base-graphics/sys/kern/kern_linker.c:284
#12 0xffffffff80a21003 in linker_file_unload (file=<value optimized out>, flags=<value optimized out>) at /usr/home/anindya/graphics/freebsd-base-graphics/sys/kern/kern_linker.c:701
#13 0xffffffff80a21003 in linker_file_unload (file=<value optimized out>, flags=<value optimized out>) at /usr/home/anindya/graphics/freebsd-base-graphics/sys/kern/kern_linker.c:701
#14 0xffffffff80f81dea in link_elf_load_file (cls=<value optimized out>, filename=<value optimized out>, result=<value optimized out>)
    at /usr/home/anindya/graphics/freebsd-base-graphics/sys/kern/link_elf_obj.c:960
#15 0xffffffff80a204df in linker_load_module (kldname=<value optimized out>, modname=0xfffff800060ebc00 "radeonkms", parent=<value optimized out>, verinfo=0x0, lfpp=<value optimized out>) at linker_if.h:161
#16 0xffffffff80a21d27 in kern_kldload (td=<value optimized out>, file=<value optimized out>, fileid=0xfffffe02325b4a54) at /usr/home/anindya/graphics/freebsd-base-graphics/sys/kern/kern_linker.c:1041
#17 0xffffffff80a21deb in sys_kldload (td=0xfffff80007b50a20, uap=<value optimized out>) at /usr/home/anindya/graphics/freebsd-base-graphics/sys/kern/kern_linker.c:1067
#18 0xffffffff80ebaab9 in amd64_syscall (td=0xfffff80007b50a20, traced=0) at subr_syscall.c:135
#19 0xffffffff80e9ad4b in Xfast_syscall () at /usr/home/anindya/graphics/freebsd-base-graphics/sys/amd64/amd64/exception.S:396
#20 0x00000008023f250a in ?? ()
Previous frame inner to this frame (corrupt stack?)
Current language:  auto; currently minimal
(kgdb) f 10
#10 0xffffffff82509a9b in _module_run (arg=<value optimized out>) at module.h:80
80              fn();
(kgdb) f 9
#9  0xffffffff8250a04b in backlight_class_exit () at device.h:349
349             linsysfs_destroy_class_dir(class);
(kgdb) f 8
#8  0xffffffff82523697 in linsysfs_destroy_class_dir (class=0xfffff800384b5e00) at /usr/home/anindya/graphics/freebsd-base-graphics/sys/modules/linuxkpi/../../compat/linsysfs/linsysfs_init.c:291
291                     pfs_destroy(class->sd);
(kgdb) p *class->sd
$1 = {
  pn_name = 0xfffff800384a8400 "***JUNK***"..., pn_type = 3735929054, pn_flags = -559038242, pn_mutex = {lock_object = {l
      lo_data = 3735929054, lo_witness = 0xdeadc0dedeadc0de}, mtx_lock = 16045693110842147038}, pn_data = 0xdeadc0dedeadc0de, pn_fill = 0xdeadc0dedeadc0de, pn_ioctl = 0xdeadc0dedeadc0de, 
  pn_close = 0xdeadc0dedeadc0de, pn_attr = 0xdeadc0dedeadc0de, pn_vis = 0xdeadc0dedeadc0de, pn_getextattr = 0xdeadc0dedeadc0de, pn_destroy = 0xdeadc0dedeadc0de, pn_info = 0xdeadc0dedeadc0de, 
  pn_fileno = 3735929054, pn_parent = 0xdeadc0dedeadc0de, pn_nodes = 0xdeadc0dedeadc0de, pn_next = 0xdeadc0dedeadc0de}
(kgdb) f 7
#7  0xffffffff80994524 in pfs_destroy (pn=0xfffff800384a8400) at /usr/home/anindya/graphics/freebsd-base-graphics/sys/fs/pseudofs/pseudofs.c:296
296             if (pn->pn_parent)
(kgdb) f 6
#6  0xffffffff80e9aa61 in calltrap () at /usr/home/anindya/graphics/freebsd-base-graphics/sys/amd64/amd64/exception.S:236
236             call    trap_check
Current language:  auto; currently asm
(kgdb)

Looks like some dangling pointers. This does not yet have Johannes' updates. I'll try rebuilding with those.

Anindya

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