[Bug 110411] GUI lock up for KVM guest in drm_atomic_helper_commit_modeset_disables()

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110411

            Bug ID: 110411
           Summary: GUI lock up for KVM guest in
                    drm_atomic_helper_commit_modeset_disables()
           Product: DRI
           Version: unspecified
          Hardware: PowerPC
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/other
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: dan at danny.cz

I see lock ups in KVM guests on Power9 HW on kernels 5.1 rc3 and rc4 with
following in the kernel log

...
dub 12 10:04:06 localhost.localdomain kernel: BUG: Unable to handle kernel
instruction fetch (NULL pointer?)
dub 12 10:04:06 localhost.localdomain kernel: Faulting instruction address:
0x00000000
dub 12 10:04:06 localhost.localdomain kernel: Oops: Kernel access of bad area,
sig: 11 [#1]
dub 12 10:04:06 localhost.localdomain kernel: LE PAGE_SIZE=64K MMU=Radix
MMU=Hash SMP NR_CPUS=1024 NUMA pSeries
dub 12 10:04:06 localhost.localdomain kernel: Modules linked in: xt_CHECKSUM
ipt_MASQUERADE tun bridge stp llc kvm_hv kvm ip6t_rpfilter ip6t_REJECT
nf_reject_ipv6 ipt_REJECT nf_reject_ipv4 >
dub 12 10:04:06 localhost.localdomain kernel: CPU: 2 PID: 1136 Comm: Xorg Not
tainted 5.1.0-0.rc4.git0.1.fc31.op.1.ppc64le #1
dub 12 10:04:06 localhost.localdomain kernel: NIP:  0000000000000000 LR:
c008000002bb2bf4 CTR: 0000000000000000
dub 12 10:04:06 localhost.localdomain kernel: REGS: c0000001f2beb5e0 TRAP: 0400
  Not tainted  (5.1.0-0.rc4.git0.1.fc31.op.1.ppc64le)
dub 12 10:04:06 localhost.localdomain kernel: MSR:  8000000040009033
<SF,EE,ME,IR,DR,RI,LE>  CR: 24882240  XER: 00000000
dub 12 10:04:06 localhost.localdomain kernel: CFAR: c008000002bb2bf0 IRQMASK: 0 
                                              GPR00: c008000002bb2904
c0000001f2beb870 c008000002bdc900 c0000000046de050 
                                              GPR04: 0000000000000003
000000000000001f c0000001fc6cf1b8 0000000000000001 
                                              GPR08: 00000000000e0000
0000000000000000 0000000000000001 c00800000289f238 
                                              GPR12: 0000000000000000
c00000000fffce00 0000000000000000 c0000001f1daa000 
                                              GPR16: 0000000000000001
0000000133e14880 ffffffffffffffff 0000000133796b90 
                                              GPR20: c0000001f2beba98
c0000001f7ebe000 c0000001f2bebc28 0000000133e0ac90 
                                              GPR24: c0000000032a5c00
c0000001f1daa000 c008000002c438e0 0000000000000001 
                                              GPR28: c0000001f1d63000
0000000000000000 c0000000046de050 c0000001f14a2400 
dub 12 10:04:06 localhost.localdomain kernel: NIP [0000000000000000]          
(null)
dub 12 10:04:06 localhost.localdomain kernel: LR [c008000002bb2bf4]
drm_atomic_helper_commit_modeset_disables+0x4ac/0x510 [drm_kms_helper]
dub 12 10:04:06 localhost.localdomain kernel: Call Trace:
dub 12 10:04:06 localhost.localdomain kernel: [c0000001f2beb910]
[c008000002bb2f90] drm_atomic_helper_commit_tail+0x38/0xb0 [drm_kms_helper]
dub 12 10:04:06 localhost.localdomain kernel: [c0000001f2beb940]
[c008000002bb30d8] commit_tail+0xd0/0xe0 [drm_kms_helper]
dub 12 10:04:06 localhost.localdomain kernel: [c0000001f2beb970]
[c008000002bb3498] drm_atomic_helper_commit+0x1e0/0x1f0 [drm_kms_helper]
dub 12 10:04:06 localhost.localdomain kernel: [c0000001f2beb9b0]
[c008000002841498] drm_atomic_commit+0x70/0xa0 [drm]
dub 12 10:04:06 localhost.localdomain kernel: [c0000001f2beba20]
[c00800000285b068] drm_mode_atomic_ioctl+0x960/0xab8 [drm]
dub 12 10:04:06 localhost.localdomain kernel: [c0000001f2bebb60]
[c00800000282888c] drm_ioctl_kernel+0xe4/0x190 [drm]
dub 12 10:04:06 localhost.localdomain kernel: [c0000001f2bebbc0]
[c008000002828dc8] drm_ioctl+0x240/0x4a0 [drm]
dub 12 10:04:06 localhost.localdomain kernel: [c0000001f2bebd10]
[c00000000041e4c0] do_vfs_ioctl+0x8a0/0xa50
dub 12 10:04:06 localhost.localdomain kernel: [c0000001f2bebdb0]
[c00000000041e734] ksys_ioctl+0xc4/0x110
dub 12 10:04:06 localhost.localdomain kernel: [c0000001f2bebe00]
[c00000000041e7a8] sys_ioctl+0x28/0x80
dub 12 10:04:06 localhost.localdomain kernel: [c0000001f2bebe20]
[c00000000000b9e4] system_call+0x5c/0x70
dub 12 10:04:06 localhost.localdomain kernel: Instruction dump:
dub 12 10:04:06 localhost.localdomain kernel: XXXXXXXX XXXXXXXX XXXXXXXX
XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX 
dub 12 10:04:06 localhost.localdomain kernel: XXXXXXXX XXXXXXXX XXXXXXXX
XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX 
dub 12 10:04:06 localhost.localdomain kernel: ---[ end trace 48e51fd2d6ea8877
]---

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