When my system (with last upstream kernel) goes into suspend (hybrid-sleep with systemd), I get sometimes (around every third to fifth time) a system freeze, when systemd removes the modules cx23885 cx25840 for my DVB-C/T card DVBSky T982. The modules are not used at the moment (e.g. by tvheadend). Kernel version from /proc/version: Linux version 4.7.0-040700rc7-generic (kernel@gloin) (gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1) ) #201607110032 SMP Mon Jul 11 04:34:25 UTC 2016 Command to remove DVB modules in a systemd/systemctl script: modprobe -r cx23885 cx25840 Whole conf for systemd/systemctl in /etc/systemd/system/dvb.service: [Unit] Description=Restart DVB services Before=sleep.target StopWhenUnneeded=yes [Service] Type=oneshot RemainAfterExit=yes ExecStart=/sbin/modprobe -r cx23885 cx25840 ExecStop=/sbin/modprobe cx25840 ; /sbin/modprobe cx23885 [Install] WantedBy=sleep.target Syslog output with error during crash/freeze: Jul 13 14:20:22 HomeServer NetworkManager[783]: <info> [1468412422.2305] manager: sleep requested (sleeping: no enabled: yes) Jul 13 14:20:22 HomeServer NetworkManager[783]: <info> [1468412422.2306] manager: sleeping... Jul 13 14:20:22 HomeServer NetworkManager[783]: <info> [1468412422.2307] manager: NetworkManager state is now ASLEEP Jul 13 14:20:22 HomeServer whoopsie[814]: [14:20:22] offline Jul 13 14:20:22 HomeServer com.canonical.indicator.application[1275]: (process:1466): indicator-application-service-WARNING **: Application already exists, re-requesting properties. Jul 13 14:20:22 HomeServer systemd[1]: Starting Restart DVB services... Jul 13 14:20:22 HomeServer kernel: [ 261.815215] BUG: unable to handle kernel NULL pointer dereference at 0000000000000200 Jul 13 14:20:22 HomeServer kernel: [ 261.815291] IP: [<ffffffffc086ecc4>] dvb_frontend_stop+0x34/0xd0 [dvb_core] Jul 13 14:20:22 HomeServer kernel: [ 261.815356] PGD 0 Jul 13 14:20:22 HomeServer kernel: [ 261.815377] Oops: 0000 [#1] SMP Jul 13 14:20:22 HomeServer kernel: [ 261.815403] Modules linked in: cx23885(-) altera_ci tda18271 altera_stapl m88ds3103 tveeprom cx2341x videobuf2_dvb dvb_core rc_core videobuf2_dma_sg videobuf2_memops videobuf2_v4l2 videobuf2_core cx25840 v4l2_common videodev fuse si2157 si2168 nls_utf8 nls_cp437 vfat fat snd_hda_codec_hdmi snd_hda_intel snd_hda_codec snd_hda_core i2c_mux snd_hwdep snd_pcm intel_rapl x86_pkg_temp_thermal intel_powerclamp snd_seq_midi coretemp snd_seq_midi_event snd_rawmidi kvm_intel kvm irqbypass intel_cstate intel_rapl_perf snd_seq efi_pstore snd_seq_device snd_timer joydev media serio_raw efivars lpc_ich sg snd mfd_core soundcore mei_me mei shpchp battery evdev tpm_tis tpm parport_pc ppdev lp parport efivarfs autofs4 ext4 crc16 jbd2 mbcache xts gf128mul algif_skcipher af_alg dm_crypt dm_mod raid10 raid1 raid0 multipath linear raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c crc32c_generic md_mod sd_mod hid_logitech_hidpp hid_logitech_dj usbhid hid crct10dif_pclmul crc32_pclmul ahci libahci crc32c_intel libata ghash_clmulni_intel cryptd scsi_mod psmouse fan thermal xhci_pci ehci_pci xhci_hcd ehci_hcd e1000e fjes ptp i915 pps_core usbcore video button i2c_algo_bit usb_common drm_kms_helper drm [last unloaded: videodev] Jul 13 14:20:22 HomeServer kernel: [ 261.816495] CPU: 0 PID: 2789 Comm: modprobe Not tainted 4.7.0-040700rc7-generic #201607110032 Jul 13 14:20:22 HomeServer kernel: [ 261.816555] Hardware name: /DH87RL, BIOS RLH8710H.86A.0330.2015.0720.1750 07/20/2015 Jul 13 14:20:22 HomeServer kernel: [ 261.816620] task: ffff8800d11ef1c0 ti: ffff8800d6be0000 task.ti: ffff8800d6be0000 Jul 13 14:20:22 HomeServer kernel: [ 261.816673] RIP: 0010:[<ffffffffc086ecc4>] [<ffffffffc086ecc4>] dvb_frontend_stop+0x34/0xd0 [dvb_core] Jul 13 14:20:22 HomeServer kernel: [ 261.816749] RSP: 0018:ffff8800d6be3d78 EFLAGS: 00010293 Jul 13 14:20:22 HomeServer kernel: [ 261.816789] RAX: ffff8800d11ef1c0 RBX: 0000000000000000 RCX: ffffea00035bd51f Jul 13 14:20:22 HomeServer kernel: [ 261.816839] RDX: 0000000080000000 RSI: ffff8800b725b400 RDI: ffff8800590e1830 Jul 13 14:20:22 HomeServer kernel: [ 261.816889] RBP: ffff8800590e1830 R08: ffffea0001459b60 R09: 0000000000000002 Jul 13 14:20:22 HomeServer kernel: [ 261.816940] R10: ffffffff81b09300 R11: ffffffff81b092c0 R12: ffff8800d1a3f280 Jul 13 14:20:22 HomeServer kernel: [ 261.820361] R13: ffff880112889768 R14: ffff880112889778 R15: 00007ffd78781738 Jul 13 14:20:22 HomeServer kernel: [ 261.823746] FS: 00007efd7e7d8700(0000) GS:ffff88011fa00000(0000) knlGS:0000000000000000 Jul 13 14:20:22 HomeServer kernel: [ 261.827151] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Jul 13 14:20:22 HomeServer kernel: [ 261.830458] CR2: 0000000000000200 CR3: 00000000343db000 CR4: 00000000000406f0 Jul 13 14:20:22 HomeServer kernel: [ 261.833570] Stack: Jul 13 14:20:22 HomeServer kernel: [ 261.836658] 0000000000000000 ffff8800590e1830 ffffffffc086f236 ffffffffc06e1281 Jul 13 14:20:22 HomeServer kernel: [ 261.839813] ffff880112889768 ffff880112889778 00007ffd78781738 0000000000000286 Jul 13 14:20:22 HomeServer kernel: [ 261.842851] 00000000d5d01479 ffff8800d1a3f000 ffff880112889768 ffffffffc06e128a Jul 13 14:20:22 HomeServer kernel: [ 261.845741] Call Trace: Jul 13 14:20:22 HomeServer kernel: [ 261.848609] [<ffffffffc086f236>] ? dvb_unregister_frontend+0x46/0x130 [dvb_core] Jul 13 14:20:22 HomeServer kernel: [ 261.851522] [<ffffffffc06e1281>] ? vb2_dvb_dealloc_frontends+0x81/0xd0 [videobuf2_dvb] Jul 13 14:20:22 HomeServer kernel: [ 261.854607] [<ffffffffc06e128a>] ? vb2_dvb_dealloc_frontends+0x8a/0xd0 [videobuf2_dvb] Jul 13 14:20:22 HomeServer kernel: [ 261.857957] [<ffffffffc06e12de>] ? vb2_dvb_unregister_bus+0xe/0x20 [videobuf2_dvb] Jul 13 14:20:22 HomeServer kernel: [ 261.861283] [<ffffffffc095649f>] ? cx23885_dvb_unregister+0xbf/0x110 [cx23885] Jul 13 14:20:22 HomeServer kernel: [ 261.864564] [<ffffffffc094da3f>] ? cx23885_dev_unregister+0xdf/0x140 [cx23885] Jul 13 14:20:22 HomeServer kernel: [ 261.867835] [<ffffffffc094dcaf>] ? cx23885_finidev+0x4f/0x80 [cx23885] Jul 13 14:20:22 HomeServer kernel: [ 261.871091] [<ffffffff813713c6>] ? pci_device_remove+0x36/0xb0 Jul 13 14:20:22 HomeServer kernel: [ 261.874315] [<ffffffff814576ea>] ? __device_release_driver+0x9a/0x150 Jul 13 14:20:22 HomeServer kernel: [ 261.877493] [<ffffffff814582ce>] ? driver_detach+0xae/0xb0 Jul 13 14:20:22 HomeServer kernel: [ 261.879501] [<ffffffff814570c5>] ? bus_remove_driver+0x55/0xd0 Jul 13 14:20:22 HomeServer kernel: [ 261.881506] [<ffffffff8136fb36>] ? pci_unregister_driver+0x26/0x70 Jul 13 14:20:22 HomeServer kernel: [ 261.883505] [<ffffffff810f9e8b>] ? SyS_delete_module+0x1ab/0x260 Jul 13 14:20:22 HomeServer kernel: [ 261.885500] [<ffffffff81003300>] ? exit_to_usermode_loop+0xa0/0xc0 Jul 13 14:20:22 HomeServer kernel: [ 261.887468] [<ffffffff815ebb36>] ? entry_SYSCALL_64_fastpath+0x1e/0xa8 Jul 13 14:20:22 HomeServer kernel: [ 261.889446] Code: 00 00 04 55 48 89 fd 53 48 8b 9f 18 03 00 00 0f 85 82 00 00 00 83 bd 04 05 00 00 02 74 0a c7 85 04 05 00 00 01 00 00 00 0f ae f0 <48> 8b bb 00 02 00 00 48 85 ff 74 5d e8 bb 89 82 c0 48 8b 93 00 Jul 13 14:20:22 HomeServer kernel: [ 261.893638] RIP [<ffffffffc086ecc4>] dvb_frontend_stop+0x34/0xd0 [dvb_core] Jul 13 14:20:22 HomeServer kernel: [ 261.895720] RSP <ffff8800d6be3d78> Jul 13 14:20:22 HomeServer kernel: [ 261.897784] CR2: 0000000000000200 Jul 13 14:20:22 HomeServer kernel: [ 261.914345] ---[ end trace 8acf386d1711ef5a ]--- Jul 13 14:20:22 HomeServer kernel: [ 262.043794] PM: Hibernation mode set to 'suspend' -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
