[Bug 110225] Kernel panic while “ modprobe amdkfd ; modprobe -r amdkfd " ; 4.14.35 kernel .

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110225

            Bug ID: 110225
           Summary: Kernel panic while “  modprobe amdkfd ;  modprobe -r
                    amdkfd "  ; 4.14.35 kernel .
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/amdkfd
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: John.p.donnelly at oracle.com

Hello ,


I am investigating a issue that our test group reported concerning this driver.
 Their test loads and unloads every kernel module included in the Oracle
4.14.35 kernel release . You don’t even need a AMD platform . It occurs on any
Intel,  or a  KVM VM instance too. 

Kernel panic while “  modprobe amdkfd ;  modprobe -r amdkfd  “

[  329.425334]  ? __slab_free+0x9b/0x2ba
[  329.427836]  ? process_slab+0x3c1/0x45c
[  329.430336]  dev_printk_emit+0x4e/0x65
[  329.432829]  __dev_printk+0x46/0x8b
[  329.435183]  _dev_info+0x6c/0x85
[  329.437435]  ? kfree+0x141/0x182
[  329.439646]  kfd_module_exit+0x37/0x39 [amdkfd]
[  329.442258]  SyS_delete_module+0x1c3/0x26f
[  329.444722]  ? entry_SYSCALL_64_after_hwframe+0xaa/0x0
[  329.447479]  ? entry_SYSCALL_64_after_hwframe+0xa3/0x0
[  329.450206]  ? entry_SYSCALL_64_after_hwframe+0x9c/0x0
[  329.452912]  ? entry_SYSCALL_64_after_hwframe+0x95/0x0
[  329.455586]  do_syscall_64+0x79/0x1ae
[  329.457766]  entry_SYSCALL_64_after_hwframe+0x151/0x0
[  329.460369] RIP: 0033:0x7f1757a1b457
[  329.462502] RSP: 002b:00007ffd62ce1f48 EFLAGS: 00000206 ORIG_RAX:


Looks like some memory corruption. 

Sometimes  the unload works but the message logged is garbage:

[root at jpd-vmbase02 ~]# modprobe -r amdkfd
[  144.449981] ???????????? hn??蟟??xn??ן??kfd: Removed module


Is  this something one of team members could have possibly corrected in an
upstream version ?

#define KFD_DRIVER_DESC         "Standalone HSA driver for AMD's GPUs"
#define KFD_DRIVER_DATE         "20150421"
#define KFD_DRIVER_MAJOR        0
#define KFD_DRIVER_MINOR        7
#define KFD_DRIVER_PATCHLEVEL   2


Thank you,

John

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