Thanks for trying, but unfortunately your kernel does not resolve the
problem:

4.13.0-32-generic #35~lp1742316 SMP Fri Jan 26 21:40:59 CST 2018 i686
i686 i686 GNU/Linux


[    6.429543] ------------[ cut here ]------------
[    6.429548] kernel BUG at 
/home/khfeng/Sources/linux-lp1742316-saa7146/drivers/media/common/saa7146/saa7146_core.c:163!
[    6.429561] invalid opcode: 0000 [#1] SMP
[    6.429708] Modules linked in: snd_hda_codec_hdmi(+) snd_hda_codec_realtek 
budget_av(+) saa7146_vv snd_hda_codec_generic budget_core ttpci_eeprom 
snd_hda_intel saa7146 ppdev videobuf_dma_sg videobuf_core dvb_core v4l2_common 
snd_hda_codec videodev snd_hda_core snd_hwdep intel_powerclamp media joydev 
input_leds snd_pcm lpc_ich snd_timer snd soundcore shpchp parport_pc parport 
nuvoton_cir mac_hid rc_core nct6775 hwmon_vid coretemp ip_tables x_tables 
autofs4 hid_generic usbhid hid gma500_gfx i2c_algo_bit drm_kms_helper 
syscopyarea sysfillrect sysimgblt ahci fb_sys_fops libahci drm r8169 mii video
[    6.431394] CPU: 3 PID: 306 Comm: systemd-udevd Not tainted 
4.13.0-32-generic #35~lp1742316
[    6.431654] Hardware name: To Be Filled By O.E.M. To Be Filled By 
O.E.M./AD2700-ITX, BIOS P1.60 04/19/2013
[    6.431949] task: f5202700 task.stack: f4886000
[    6.432108] EIP: saa7146_vmalloc_build_pgtable+0x180/0x1020 [saa7146]
[    6.432301] EFLAGS: 00010246 CPU: 3
[    6.432406] EAX: f21e2568 EBX: f8365000 ECX: 00000002 EDX: fff1c000
[    6.432592] ESI: 00000000 EDI: f871f000 EBP: f4887c44 ESP: f4887c20
[    6.432784]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[    6.432954] CR0: 80050033 CR2: 00b6e924 CR3: 35048940 CR4: 000006f0
[    6.433142] Call Trace:
[    6.433229]  ttpci_budget_init+0x26c/0x530 [budget_core]
[    6.433398]  budget_av_attach+0x75/0x4e8 [budget_av]
[    6.433556]  ? vprintk_func+0x29/0x70
[    6.433666]  ? printk+0x13/0x15
[    6.433767]  ? saa7146_init_one+0x69f/0x770 [saa7146]
[    6.433925]  saa7146_init_one+0x70b/0x770 [saa7146]
[    6.434080]  ? __pm_runtime_resume+0x51/0x80
[    6.434213]  pci_device_probe+0xc2/0x160
[    6.434328]  driver_probe_device+0x2b9/0x410
[    6.434457]  __driver_attach+0x99/0xe0
[    6.434575]  ? driver_probe_device+0x410/0x410
[    6.434708]  bus_for_each_dev+0x57/0x90
[    6.434832]  driver_attach+0x19/0x20
[    6.434937]  ? driver_probe_device+0x410/0x410
[    6.440934]  bus_add_driver+0x187/0x230
[    6.440938]  ? 0xf8522000
[    6.440943]  driver_register+0x56/0xd0
[    6.440946]  ? 0xf8522000
[    6.440950]  __pci_register_driver+0x33/0x40
[    6.440957]  saa7146_register_extension+0x50/0x80 [saa7146]
[    6.440966]  budget_av_init+0xd/0x1000 [budget_av]
[    6.440971]  do_one_initcall+0x46/0x180
[    6.440977]  ? kfree+0x134/0x140
[    6.440980]  ? kfree+0x134/0x140
[    6.440983]  ? kfree+0x134/0x140
[    6.440987]  ? kmem_cache_alloc_trace+0x13d/0x1a0
[    6.440992]  ? do_init_module+0x21/0x1cc
[    6.440995]  ? do_init_module+0x21/0x1cc
[    6.441000]  do_init_module+0x50/0x1cc
[    6.441004]  load_module+0x1533/0x1aa0
[    6.441011]  ? kernel_read_file+0x26e/0x2a0
[    6.441018]  SyS_finit_module+0x8a/0xe0
[    6.441025]  do_fast_syscall_32+0x71/0x150
[    6.441032]  entry_SYSENTER_32+0x4e/0x7c
[    6.441034] EIP: 0xb7f5acf9
[    6.441036] EFLAGS: 00000292 CPU: 3
[    6.441039] EAX: ffffffda EBX: 00000018 ECX: b7d4ba71 EDX: 00000000
[    6.441042] ESI: 01a60ec0 EDI: 01a5e940 EBP: 00000000 ESP: bfc713bc
[    6.441045]  DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b
[    6.441049] Code: e8 e8 c5 eb ff ff 85 c0 59 75 7c 8b 45 ec 8d 65 f4 5b 5e 
5f 5d c3 90 8d 74 26 00 83 3d f0 ec e1 dd 02 0f 85 07 ff ff ff 8d 76 00 <0f> 0b 
8d b6 00 00 00 00 0f 0b 8d b6 00 00 00 00 c7 45 dc 00 00
[    6.441125] EIP: saa7146_vmalloc_build_pgtable+0x180/0x1020 [saa7146] 
SS:ESP: 0068:f4887c20
[    6.441210] ---[ end trace 4087a60d1b1a4971 ]---

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https://bugs.launchpad.net/bugs/1742316

Title:
  DVB Card with SAA7146 chipset not working

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