[Bug 85974] system hangs on xv ports exceeded

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85974

--- Comment #2 from Nicola <lists at svrinformatica.it> ---
here is the trace

[ 1981.282910] ------------[ cut here ]------------
[ 1981.282959] WARNING: CPU: 0 PID: 373 at
drivers/gpu/drm/i915/intel_display.c:3361
intel_crtc_wait_for_pending_flips+0x1a1/0x1b0 [i915]()
[ 1981.282961] Modules linked in: tun bnep bluetooth fuse act_police cls_basic
cls_flow cls_fw cls_u32 sch_fq_codel sch_tbf sch_prio sch_htb sch_hfsc
sch_ingress sch_sfq xt_CHECKSUM ipt_rpfilter xt_statistic xt_CT nf_log_ipv4
nf_log_common xt_connlimit xt_realm xt_addrtype xt_comment xt_recent
snd_hda_codec_hdmi xt_nat ipt_REJECT ipt_MASQUERADE ipt_ECN ipt_CLUSTERIP
ipt_ah xt_set ip_set xt_LOG nf_nat_tftp nf_nat_snmp_basic nf_conntrack_snmp
nf_nat_sip nf_nat_pptp nf_nat_proto_gre nf_nat_irc nf_nat_h323 nf_nat_ftp
nf_nat_amanda ts_kmp nf_conntrack_amanda nf_conntrack_sane nf_conntrack_tftp
nf_conntrack_sip nf_conntrack_proto_udplite nf_conntrack_proto_sctp
nf_conntrack_pptp nf_conntrack_proto_gre nf_conntrack_netlink
nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_irc
nf_conntrack_h323 nf_conntrack_ftp
[ 1981.282999]  xt_TPROXY nf_defrag_ipv6 xt_time xt_TCPMSS xt_tcpmss xt_sctp
xt_policy xt_pkttype xt_physdev xt_owner xt_NFQUEUE xt_NFLOG nfnetlink_log
xt_multiport xt_mark xt_mac xt_limit xt_length xt_iprange xt_helper
xt_hashlimit xt_DSCP xt_dscp xt_dccp xt_conntrack xt_connmark xt_CLASSIFY
xt_tcpudp xt_state iptable_raw iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4
nf_defrag_ipv4 nf_conntrack iptable_mangle nfnetlink hid_generic uvcvideo
cdc_mbim videobuf2_vmalloc videobuf2_memops videobuf2_core usbhid v4l2_common
videodev cdc_ncm usbnet mii cdc_wdm hid cdc_acm media joydev mousedev
iptable_filter ip_tables x_tables arc4 snd_hda_codec_realtek
snd_hda_codec_generic coretemp intel_rapl x86_pkg_temp_thermal intel_powerclamp
kvm_intel iwlmvm kvm mac80211 crct10dif_pclmul crc32_pclmul crc32c_intel
[ 1981.283040]  iTCO_wdt iTCO_vendor_support ghash_clmulni_intel aesni_intel
aes_x86_64 lrw gf128mul glue_helper ablk_helper evdev cryptd mac_hid psmouse
iwlwifi serio_raw pcspkr i2c_i801 rtsx_pci_ms thermal memstick cfg80211 wmi
thinkpad_acpi nvram led_class hwmon battery tpm_tis ac tpm rfkill i915 button
snd_hda_intel video snd_hda_controller drm_kms_helper snd_hda_codec drm
snd_hwdep snd_pcm e1000e snd_timer intel_gtt i2c_algo_bit snd i2c_core mei_me
ie31200_edac mei soundcore ptp shpchp edac_core pps_core lpc_ich processor
pci_stub vboxpci(O) vboxnetflt(O) vboxnetadp(O) vboxdrv(O) rtsx_pci_sdmmc
mmc_core atkbd libps2 ehci_pci xhci_hcd ehci_hcd rtsx_pci usbcore usb_common
i8042 serio ext4 crc16 mbcache sr_mod cdrom jbd2 sd_mod crc_t10dif
crct10dif_common ahci libahci libata scsi_mod
[ 1981.283096] CPU: 0 PID: 373 Comm: Xorg.bin Tainted: G        W  O  
3.17.2-1-ARCH #1
[ 1981.283098] Hardware name: LENOVO 20BE0065IX/20BE0065IX, BIOS GMET66WW (2.14
) 07/01/2014
[ 1981.283099]  0000000000000000 000000001f153aca ffff8800a9123c28
ffffffff815367d0
[ 1981.283102]  0000000000000000 ffff8800a9123c60 ffffffff8107054d
0000000000000000
[ 1981.283105]  ffff88022dcf8288 ffff880232f81000 ffff8800aa975800
ffff8800aa975800
[ 1981.283108] Call Trace:
[ 1981.283114]  [<ffffffff815367d0>] dump_stack+0x4d/0x6f
[ 1981.283120]  [<ffffffff8107054d>] warn_slowpath_common+0x7d/0xa0
[ 1981.283123]  [<ffffffff8107067a>] warn_slowpath_null+0x1a/0x20
[ 1981.283142]  [<ffffffffa049a291>]
intel_crtc_wait_for_pending_flips+0x1a1/0x1b0 [i915]
[ 1981.283147]  [<ffffffff810af6a0>] ? __wake_up_sync+0x20/0x20
[ 1981.283163]  [<ffffffffa049a348>] intel_primary_plane_disable+0xa8/0xe0
[i915]
[ 1981.283179]  [<ffffffffa03bba02>] setplane_internal+0x192/0x2b0 [drm]
[ 1981.283192]  [<ffffffffa03ba1c9>] ? _object_find+0x69/0xa0 [drm]
[ 1981.283206]  [<ffffffffa03bf0e5>] drm_mode_setplane+0x145/0x1e0 [drm]
[ 1981.283218]  [<ffffffffa03b0fcf>] drm_ioctl+0x1df/0x680 [drm]
[ 1981.283228]  [<ffffffff811de2da>] ? __dentry_kill+0x17a/0x200
[ 1981.283231]  [<ffffffff811e6a38>] ? mntput_no_expire+0x28/0x140
[ 1981.283235]  [<ffffffff811d9eb0>] do_vfs_ioctl+0x2d0/0x4b0
[ 1981.283238]  [<ffffffff811e453e>] ? __fget+0x6e/0xb0
[ 1981.283241]  [<ffffffff811da111>] SyS_ioctl+0x81/0xa0
[ 1981.283245]  [<ffffffff8153c7a9>] system_call_fastpath+0x16/0x1b
[ 1981.283246] ---[ end trace 40e5800abe4f2d8b ]---
[ 1981.302708] [drm:intel_pipe_set_base] *ERROR* pipe is still busy with an old
pageflip



I have an additional display connected to my laptop, maybe this can make some
difference.

Regarding the limit, since it is arbitrary, probably make sense to raise to
something like 32 at least for modern hw, for example the same laptop with
windows OS can display more than 16 videos using direct3d

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