<html>
    <head>
      <base href="https://bugs.freedesktop.org/">
    </head>
    <body>
      <p>
        <div>
            <b><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Kernel panic (?) when turning off HDMI2 via xrandr after kexec reboot with 4.8.5"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=98510#c1">Comment # 1</a>
              on <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Kernel panic (?) when turning off HDMI2 via xrandr after kexec reboot with 4.8.5"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=98510">bug 98510</a>
              from <span class="vcard"><a class="email" href="mailto:sverd.johnsen@googlemail.com" title="Sverd Johnsen <sverd.johnsen@googlemail.com>"> <span class="fn">Sverd Johnsen</span></a>
</span></b>
        <pre>Tried this today with 4.9-rc7 (next-20161130) and seems to work again. 

I only get some messages now rather than hard crash:

[   46.931290] ------------[ cut here ]------------
[   46.931310] WARNING: CPU: 2 PID: 591 at
drivers/gpu/drm/i915/intel_runtime_pm.c:1719
intel_display_power_put+0x131/0x140
[   46.931311] Use count on domain AUDIO is already zero
[   46.931313] Modules linked in: nls_iso8859_1 nls_cp437 vfat fat xfrm_user
xfrm4_tunnel tunnel4 ipcomp xfrm_ipcomp esp4 ah4 af_key xfrm_algo
nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nf_log_ipv6
nf_log_ipv4 nf_log_common nf_conntrack_ipv6 nf_defrag_ipv6 nf_conntrack_ipv4
nf_defrag_ipv4 nft_ct nf_conntrack nft_log nft_counter nft_meta nft_set_hash
nft_set_rbtree nf_tables_inet nf_tables_ipv6 nf_tables_ipv4 ecb algif_skcipher
af_alg af_packet uas usb_storage kvm_intel vhost_net tun vhost macvtap macvlan
kvm intel_pch_thermal psmouse atkbd libps2 x86_pkg_temp_thermal
intel_powerclamp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel intel_cstate
intel_uncore intel_rapl_perf shpchp mei_me mei fan thermal battery i8042
tpm_infineon tpm_tis tpm_tis_core tpm acpi_pad
[   46.931394] CPU: 2 PID: 591 Comm: Xorg Tainted: G        W      
4.9.0-1-next-20161130-next #1
[   46.931396] Call Trace:
[   46.931403]  dump_stack+0x4d/0x63
[   46.931409]  __warn+0xc1/0xe0
[   46.931413]  warn_slowpath_fmt+0x5a/0x80
[   46.931422]  ? intel_pin_eld_notify+0x61/0x70
[   46.931427]  intel_display_power_put+0x131/0x140
[   46.931430]  intel_disable_ddi+0x4d/0x80
[   46.931435]  intel_encoders_disable.isra.76+0x7f/0x90
[   46.931439]  haswell_crtc_disable+0x55/0x170
[   46.931444]  intel_atomic_commit_tail+0x10c/0xfd0
[   46.931449]  ? intel_prepare_plane_fb+0x148/0x280
[   46.931454]  intel_atomic_commit+0x3b8/0x4e0
[   46.931461]  ? drm_atomic_set_crtc_for_connector+0xdc/0xf0
[   46.931467]  drm_atomic_commit+0x46/0x50
[   46.931473]  drm_atomic_helper_set_config+0x7d/0xe0
[   46.931477]  drm_mode_set_config_internal+0x60/0x110
[   46.931480]  drm_mode_setcrtc+0x432/0x530
[   46.931485]  ? unix_stream_recvmsg+0x4f/0x70
[   46.931490]  drm_ioctl+0x216/0x4b0
[   46.931494]  ? drm_mode_getcrtc+0x140/0x140
[   46.931500]  ? handle_mm_fault+0x6eb/0x1170
[   46.931504]  do_vfs_ioctl+0x9e/0x5f0
[   46.931509]  ? __fget+0x72/0xa0
[   46.931512]  SyS_ioctl+0x74/0x80
[   46.931515]  do_syscall_64+0x48/0xb0
[   46.931521]  entry_SYSCALL64_slow_path+0x25/0x25
[   46.931524] RIP: 0033:0x7f9686f3cf57
[   46.931527] RSP: 002b:00007ffeb8433708 EFLAGS: 00000246 ORIG_RAX:
0000000000000010
[   46.931531] RAX: ffffffffffffffda RBX: 0000000000000005 RCX:
00007f9686f3cf57
[   46.931533] RDX: 00007ffeb8433740 RSI: 00000000c06864a2 RDI:
000000000000000a
[   46.931535] RBP: 00007ffeb8433740 R08: 0000000000000001 R09:
0000000000000000
[   46.931537] R10: 0000000000000001 R11: 0000000000000246 R12:
00000000c06864a2
[   46.931539] R13: 000000000000000a R14: 00000000026e8be0 R15:
00000000026e89e0
[   46.931542] ---[ end trace cfa83528fda45952 ]---
[   46.959955] ------------[ cut here ]------------
[   46.959962] WARNING: CPU: 2 PID: 591 at
drivers/gpu/drm/i915/intel_runtime_pm.c:168 intel_display_power_put+0x107/0x140
[   46.959963] Use count on power well power well 2 is already zero
[   46.959963] Modules linked in:
[   46.959964]  nls_iso8859_1 nls_cp437 vfat fat xfrm_user xfrm4_tunnel tunnel4
ipcomp xfrm_ipcomp esp4 ah4 af_key xfrm_algo nft_reject_inet nf_reject_ipv4
nf_reject_ipv6 nft_reject nf_log_ipv6 nf_log_ipv4 nf_log_common
nf_conntrack_ipv6 nf_defrag_ipv6 nf_conntrack_ipv4 nf_defrag_ipv4 nft_ct
nf_conntrack nft_log nft_counter nft_meta nft_set_hash nft_set_rbtree
nf_tables_inet nf_tables_ipv6 nf_tables_ipv4 ecb algif_skcipher af_alg
af_packet uas usb_storage kvm_intel vhost_net tun vhost macvtap macvlan kvm
intel_pch_thermal psmouse atkbd libps2 x86_pkg_temp_thermal intel_powerclamp
crct10dif_pclmul crc32_pclmul ghash_clmulni_intel intel_cstate intel_uncore
intel_rapl_perf shpchp mei_me mei fan thermal battery i8042 tpm_infineon
tpm_tis tpm_tis_core tpm acpi_pad
[   46.959999] CPU: 2 PID: 591 Comm: Xorg Tainted: G        W      
4.9.0-1-next-20161130-next #1
[   46.960000] Call Trace:
[   46.960003]  dump_stack+0x4d/0x63
[   46.960005]  __warn+0xc1/0xe0
[   46.960007]  warn_slowpath_fmt+0x5a/0x80
[   46.960009]  ? intel_runtime_pm_put+0x69/0xa0
[   46.960011]  intel_display_power_put+0x107/0x140
[   46.960014]  intel_atomic_commit_tail+0x4b9/0xfd0
[   46.960016]  ? intel_prepare_plane_fb+0x148/0x280
[   46.960018]  intel_atomic_commit+0x3b8/0x4e0
[   46.960021]  ? drm_atomic_set_crtc_for_connector+0xdc/0xf0
[   46.960023]  drm_atomic_commit+0x46/0x50
[   46.960026]  drm_atomic_helper_set_config+0x7d/0xe0
[   46.960028]  drm_mode_set_config_internal+0x60/0x110
[   46.960029]  drm_mode_setcrtc+0x432/0x530
[   46.960031]  ? unix_stream_recvmsg+0x4f/0x70
[   46.960033]  drm_ioctl+0x216/0x4b0
[   46.960034]  ? drm_mode_getcrtc+0x140/0x140
[   46.960037]  ? handle_mm_fault+0x6eb/0x1170
[   46.960038]  do_vfs_ioctl+0x9e/0x5f0
[   46.960040]  ? __fget+0x72/0xa0
[   46.960042]  SyS_ioctl+0x74/0x80
[   46.960043]  do_syscall_64+0x48/0xb0
[   46.960046]  entry_SYSCALL64_slow_path+0x25/0x25
[   46.960047] RIP: 0033:0x7f9686f3cf57
[   46.960048] RSP: 002b:00007ffeb8433708 EFLAGS: 00000246 ORIG_RAX:
0000000000000010
[   46.960050] RAX: ffffffffffffffda RBX: 0000000000000005 RCX:
00007f9686f3cf57
[   46.960051] RDX: 00007ffeb8433740 RSI: 00000000c06864a2 RDI:
000000000000000a
[   46.960051] RBP: 00007ffeb8433740 R08: 0000000000000001 R09:
0000000000000000
[   46.960052] R10: 0000000000000001 R11: 0000000000000246 R12:
00000000c06864a2
[   46.960053] R13: 000000000000000a R14: 00000000026ec3b0 R15:
00000000026e96b0
[   46.960054] ---[ end trace cfa83528fda45953 ]---
[   46.960059] ------------[ cut here ]------------
[   46.960061] WARNING: CPU: 2 PID: 591 at
drivers/gpu/drm/i915/intel_runtime_pm.c:168 intel_display_power_put+0x107/0x140
[   46.960062] Use count on power well DC off is already zero
[   46.960063] Modules linked in:
[   46.960063]  nls_iso8859_1 nls_cp437 vfat fat xfrm_user xfrm4_tunnel tunnel4
ipcomp xfrm_ipcomp esp4 ah4 af_key xfrm_algo nft_reject_inet nf_reject_ipv4
nf_reject_ipv6 nft_reject nf_log_ipv6 nf_log_ipv4 nf_log_common
nf_conntrack_ipv6 nf_defrag_ipv6 nf_conntrack_ipv4 nf_defrag_ipv4 nft_ct
nf_conntrack nft_log nft_counter nft_meta nft_set_hash nft_set_rbtree
nf_tables_inet nf_tables_ipv6 nf_tables_ipv4 ecb algif_skcipher af_alg
af_packet uas usb_storage kvm_intel vhost_net tun vhost macvtap macvlan kvm
intel_pch_thermal psmouse atkbd libps2 x86_pkg_temp_thermal intel_powerclamp
crct10dif_pclmul crc32_pclmul ghash_clmulni_intel intel_cstate intel_uncore
intel_rapl_perf shpchp mei_me mei fan thermal battery i8042 tpm_infineon
tpm_tis tpm_tis_core tpm acpi_pad
[   46.960089] CPU: 2 PID: 591 Comm: Xorg Tainted: G        W      
4.9.0-1-next-20161130-next #1
[   46.960090] Call Trace:
[   46.960092]  dump_stack+0x4d/0x63
[   46.960094]  __warn+0xc1/0xe0
[   46.960095]  warn_slowpath_fmt+0x5a/0x80
[   46.960098]  ? __wake_up_locked+0xe/0x10
[   46.960100]  ? complete_all+0x3d/0x50
[   46.960102]  intel_display_power_put+0x107/0x140
[   46.960104]  intel_atomic_commit_tail+0xbc8/0xfd0
[   46.960106]  ? intel_prepare_plane_fb+0x148/0x280
[   46.960108]  intel_atomic_commit+0x3b8/0x4e0
[   46.960110]  ? drm_atomic_set_crtc_for_connector+0xdc/0xf0
[   46.960112]  drm_atomic_commit+0x46/0x50
[   46.960114]  drm_atomic_helper_set_config+0x7d/0xe0
[   46.960116]  drm_mode_set_config_internal+0x60/0x110
[   46.960117]  drm_mode_setcrtc+0x432/0x530
[   46.960119]  ? unix_stream_recvmsg+0x4f/0x70
[   46.960121]  drm_ioctl+0x216/0x4b0
[   46.960122]  ? drm_mode_getcrtc+0x140/0x140
[   46.960124]  ? handle_mm_fault+0x6eb/0x1170
[   46.960125]  do_vfs_ioctl+0x9e/0x5f0
[   46.960127]  ? __fget+0x72/0xa0
[   46.960128]  SyS_ioctl+0x74/0x80
[   46.960129]  do_syscall_64+0x48/0xb0
[   46.960132]  entry_SYSCALL64_slow_path+0x25/0x25
[   46.960132] RIP: 0033:0x7f9686f3cf57
[   46.960133] RSP: 002b:00007ffeb8433708 EFLAGS: 00000246 ORIG_RAX:
0000000000000010
[   46.960135] RAX: ffffffffffffffda RBX: 0000000000000005 RCX:
00007f9686f3cf57
[   46.960135] RDX: 00007ffeb8433740 RSI: 00000000c06864a2 RDI:
000000000000000a
[   46.960136] RBP: 00007ffeb8433740 R08: 0000000000000001 R09:
0000000000000000
[   46.960137] R10: 0000000000000001 R11: 0000000000000246 R12:
00000000c06864a2
[   46.960138] R13: 000000000000000a R14: 00000000026ec3b0 R15:
00000000026e96b0
[   46.960139] ---[ end trace cfa83528fda45954 ]---
[   46.960139] ------------[ cut here ]------------
[   46.960141] WARNING: CPU: 2 PID: 591 at
drivers/gpu/drm/i915/intel_runtime_pm.c:168 intel_display_power_put+0x107/0x140
[   46.960142] Use count on power well always-on is already zero
[   46.960142] Modules linked in:
[   46.960143]  nls_iso8859_1 nls_cp437 vfat fat xfrm_user xfrm4_tunnel tunnel4
ipcomp xfrm_ipcomp esp4 ah4 af_key xfrm_algo nft_reject_inet nf_reject_ipv4
nf_reject_ipv6 nft_reject nf_log_ipv6 nf_log_ipv4 nf_log_common
nf_conntrack_ipv6 nf_defrag_ipv6 nf_conntrack_ipv4 nf_defrag_ipv4 nft_ct
nf_conntrack nft_log nft_counter nft_meta nft_set_hash nft_set_rbtree
nf_tables_inet nf_tables_ipv6 nf_tables_ipv4 ecb algif_skcipher af_alg
af_packet uas usb_storage kvm_intel vhost_net tun vhost macvtap macvlan kvm
intel_pch_thermal psmouse atkbd libps2 x86_pkg_temp_thermal intel_powerclamp
crct10dif_pclmul crc32_pclmul ghash_clmulni_intel intel_cstate intel_uncore
intel_rapl_perf shpchp mei_me mei fan thermal battery i8042 tpm_infineon
tpm_tis tpm_tis_core tpm acpi_pad
[   46.960168] CPU: 2 PID: 591 Comm: Xorg Tainted: G        W      
4.9.0-1-next-20161130-next #1
[   46.960169] Call Trace:
[   46.960170]  dump_stack+0x4d/0x63
[   46.960172]  __warn+0xc1/0xe0
[   46.960174]  warn_slowpath_fmt+0x5a/0x80
[   46.960176]  ? __wake_up_locked+0xe/0x10
[   46.960178]  ? complete_all+0x3d/0x50
[   46.960179]  intel_display_power_put+0x107/0x140
[   46.960181]  intel_atomic_commit_tail+0xbc8/0xfd0
[   46.960183]  ? intel_prepare_plane_fb+0x148/0x280
[   46.960185]  intel_atomic_commit+0x3b8/0x4e0
[   46.960187]  ? drm_atomic_set_crtc_for_connector+0xdc/0xf0
[   46.960189]  drm_atomic_commit+0x46/0x50
[   46.960192]  drm_atomic_helper_set_config+0x7d/0xe0
[   46.960193]  drm_mode_set_config_internal+0x60/0x110
[   46.960194]  drm_mode_setcrtc+0x432/0x530
[   46.960196]  ? unix_stream_recvmsg+0x4f/0x70
[   46.960198]  drm_ioctl+0x216/0x4b0
[   46.960199]  ? drm_mode_getcrtc+0x140/0x140
[   46.960201]  ? handle_mm_fault+0x6eb/0x1170
[   46.960202]  do_vfs_ioctl+0x9e/0x5f0
[   46.960204]  ? __fget+0x72/0xa0
[   46.960205]  SyS_ioctl+0x74/0x80
[   46.960206]  do_syscall_64+0x48/0xb0
[   46.960208]  entry_SYSCALL64_slow_path+0x25/0x25
[   46.960209] RIP: 0033:0x7f9686f3cf57
[   46.960210] RSP: 002b:00007ffeb8433708 EFLAGS: 00000246 ORIG_RAX:
0000000000000010
[   46.960211] RAX: ffffffffffffffda RBX: 0000000000000005 RCX:
00007f9686f3cf57
[   46.960212] RDX: 00007ffeb8433740 RSI: 00000000c06864a2 RDI:
000000000000000a
[   46.960212] RBP: 00007ffeb8433740 R08: 0000000000000001 R09:
0000000000000000
[   46.960213] R10: 0000000000000001 R11: 0000000000000246 R12:
00000000c06864a2
[   46.960214] R13: 000000000000000a R14: 00000000026ec3b0 R15:
00000000026e96b0
[   46.960243] ---[ end trace cfa83528fda45955 ]---</pre>
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