Kernel trace at drivers/media/v4l2-core/v4l2-dev.c:438 v4l2_open+0xc8/0x140 [videodev] when loading kernel module. [6.18.4, vanilla kernel, self compiled.] #298
Description
Ahoj,
I use the Linux kernel from release 2.1.4 of this project.
When I load v4l2loopback_dc, I get a kernel trace:
[ 122.181298] [ T8213] v4l2loopback driver version 0.6.4 (droidcam) loaded
[ 122.183474] [ T8215] ------------[ cut here ]------------
[ 122.183476] [ T8215] WARNING: CPU: 14 PID: 8215 at drivers/media/v4l2-core/v4l2-dev.c:438 v4l2_open+0xc8/0x140 [videodev]
[ 122.183489] [ T8215] Modules linked in: v4l2loopback_dc(OE) bnep btusb btmtk btrtl btbcm btintel bluetooth nft_masq nft_ct snd_seq_dummy snd_hrtimer snd_seq snd_seq_device nft_reject_ipv4 nf_reject_ipv4 nft_reject act_csum cls_u32 sch_htb nft_chain_nat xt_MASQUERADE nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nft_compat x_tables bridge stp llc qrtr loop fuse vboxnetflt(OE) vboxnetadp(OE) vboxdrv(OE) one(OE) dm_multipath joydev kheaders iwlmvm keymash(OE) snd_aloop mac80211 videodev intel_rapl_msr snd_hda_codec_conexant intel_rapl_common mc libarc4 snd_hda_codec_generic snd_hda_codec_atihdmi snd_hda_codec_hdmi snd_hda_intel sg iwlwifi snd_hda_codec scsi_mod snd_hda_core snd_intel_dspcfg snd_intel_sdw_acpi snd_hwdep scsi_common cfg80211 snd_pcm snd_timer kvm_amd snd hid_multitouch acpi_call(OE) bmi260_i2c(OE) kvm ntsync irqbypass bmi260_core(OE) amdxdna soundcore rfkill industrialio_triggered_buffer i2c_hid_acpi mac_hid kfifo_buf i2c_hid industrialio tpm_tis i2c_piix4 ryzen_smu(OE) pcspkr tpm_tis_core amdgpu
[ 122.183533] [ T8215] drm_panel_backlight_quirks crc16 drm_buddy drm_suballoc_helper drm_exec sdhci_pci i2c_algo_bit cqhci drm_display_helper iosf_mbi sdhci_uhs2 sdhci gpu_sched amdxcp serio_raw drm_ttm_helper mmc_core ttm xhci_pci usbhid psmouse mousedev f2fs ledtrig_usbport ucsi_acpi typec_ucsi roles typec thunderbolt ohci_hcd ehci_hcd xhci_hcd usbcore usb_common
[ 122.183550] [ T8215] Unloaded tainted modules: v4l2loopback(OE):1 v4l2loopback_dc(OE):2 [last unloaded: v4l2loopback(OE)]
[ 122.183556] [ T8215] CPU: 14 UID: 0 PID: 8215 Comm: v4l_id Tainted: G W OE 6.18.4-vanilla-customconfig-clang #2 PREEMPT(lazy) c27cc6abfe3a08a6bb12b58d3c8eb9d5f5a1ee27
[ 122.183559] [ T8215] Tainted: [W]=WARN, [O]=OOT_MODULE, [E]=UNSIGNED_MODULE
[ 122.183560] [ T8215] Hardware name: GPD G1619-04/G1619-04, BIOS 0.42 10/22/2024
[ 122.183561] [ T8215] RIP: 0010:v4l2_open+0xc8/0x140 [videodev]
[ 122.183567] [ T8215] Code: c0 49 f7 87 48 04 00 00 02 00 00 00 74 1c 41 f6 87 68 04 00 00 04 75 37 85 c0 74 5f 48 89 df 89 c3 e8 2c 40 31 f6 89 d8 eb 53 <0f> 0b 49 8b 87 a8 00 00 00 4c 89 f7 4c 8b 58 48 2e 2e 2e 41 ff d3
[ 122.183568] [ T8215] RSP: 0018:ffffcc3ec2f23a20 EFLAGS: 00010246
[ 122.183569] [ T8215] RAX: 0000000000000000 RBX: ffff8acec92710b8 RCX: 0000000000000000
[ 122.183570] [ T8215] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[ 122.183571] [ T8215] RBP: 00000000fffffffa R08: 0000000000000000 R09: 0000000000000000
[ 122.183572] [ T8215] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffffc1ed6ca8
[ 122.183573] [ T8215] R13: ffff8acef61361c0 R14: ffff8acef6136180 R15: ffff8acec9271000
[ 122.183574] [ T8215] FS: 00007efc2ce65740(0000) GS:ffff8ad83250d000(0000) knlGS:0000000000000000
[ 122.183575] [ T8215] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 122.183576] [ T8215] CR2: 000055712786c16c CR3: 000000024a800000 CR4: 0000000000f50ef0
[ 122.183577] [ T8215] PKRU: 55555554
[ 122.183577] [ T8215] Call Trace:
[ 122.183579] [ T8215] <TASK>
[ 122.183581] [ T8215] chrdev_open+0x1fe/0x2f0
[ 122.183584] [ T8215] ? base_probe+0x60/0x60
[ 122.183586] [ T8215] do_dentry_open+0x397/0x5b0
[ 122.183588] [ T8215] vfs_open+0x26/0xf0
[ 122.183589] [ T8215] path_openat+0xeb1/0x1150
[ 122.183591] [ T8215] do_filp_open+0xcf/0x190
[ 122.183594] [ T8215] do_sys_openat2+0xa5/0x1a0
[ 122.183596] [ T8215] __x64_sys_openat+0x80/0xb0
[ 122.183597] [ T8215] do_syscall_64+0x81/0x300
[ 122.183602] [ T8215] entry_SYSCALL_64_after_hwframe+0x55/0x5d
[ 122.183603] [ T8215] RIP: 0033:0x7efc2cc90efa
[ 122.183605] [ T8215] Code: 08 03 00 00 59 5e 48 83 f8 fc 75 1e 83 e2 39 83 fa 08 75 16 e8 27 ff ff ff 0f 1f 80 00 00 00 00 49 89 ca 48 8b 44 24 20 0f 05 <48> 83 c4 18 c3 90 f3 0f 1e fa 48 83 ec 10 ff 74 24 18 e8 5f ff ff
[ 122.183605] [ T8215] RSP: 002b:00007ffdaed27800 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
[ 122.183607] [ T8215] RAX: ffffffffffffffda RBX: 00007ffdaed27a88 RCX: 00007efc2cc90efa
[ 122.183608] [ T8215] RDX: 0000000000080100 RSI: 00007ffdaed27f26 RDI: ffffffffffffff9c
[ 122.183608] [ T8215] RBP: 00007ffdaed27970 R08: 0000000000000000 R09: 0000000000000000
[ 122.183610] [ T8215] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000002
[ 122.183610] [ T8215] R13: 00007efc2cf4c000 R14: 00007ffdaed278d0 R15: 000055712786ea98
[ 122.183612] [ T8215] </TASK>
[ 122.183612] [ T8215] ---[ end trace 0000000000000000 ]---
[ 122.188351] [ T5971] ------------[ cut here ]------------
[ 122.188353] [ T5971] WARNING: CPU: 13 PID: 5971 at drivers/media/v4l2-core/v4l2-dev.c:438 v4l2_open+0xc8/0x140 [videodev]
[ 122.188366] [ T5971] Modules linked in: v4l2loopback_dc(OE) bnep btusb btmtk btrtl btbcm btintel bluetooth nft_masq nft_ct snd_seq_dummy snd_hrtimer snd_seq snd_seq_device nft_reject_ipv4 nf_reject_ipv4 nft_reject act_csum cls_u32 sch_htb nft_chain_nat xt_MASQUERADE nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nft_compat x_tables bridge stp llc qrtr loop fuse vboxnetflt(OE) vboxnetadp(OE) vboxdrv(OE) one(OE) dm_multipath joydev kheaders iwlmvm keymash(OE) snd_aloop mac80211 videodev intel_rapl_msr snd_hda_codec_conexant intel_rapl_common mc libarc4 snd_hda_codec_generic snd_hda_codec_atihdmi snd_hda_codec_hdmi snd_hda_intel sg iwlwifi snd_hda_codec scsi_mod snd_hda_core snd_intel_dspcfg snd_intel_sdw_acpi snd_hwdep scsi_common cfg80211 snd_pcm snd_timer kvm_amd snd hid_multitouch acpi_call(OE) bmi260_i2c(OE) kvm ntsync irqbypass bmi260_core(OE) amdxdna soundcore rfkill industrialio_triggered_buffer i2c_hid_acpi mac_hid kfifo_buf i2c_hid industrialio tpm_tis i2c_piix4 ryzen_smu(OE) pcspkr tpm_tis_core amdgpu
[ 122.188413] [ T5971] drm_panel_backlight_quirks crc16 drm_buddy drm_suballoc_helper drm_exec sdhci_pci i2c_algo_bit cqhci drm_display_helper iosf_mbi sdhci_uhs2 sdhci gpu_sched amdxcp serio_raw drm_ttm_helper mmc_core ttm xhci_pci usbhid psmouse mousedev f2fs ledtrig_usbport ucsi_acpi typec_ucsi roles typec thunderbolt ohci_hcd ehci_hcd xhci_hcd usbcore usb_common
[ 122.188432] [ T5971] Unloaded tainted modules: v4l2loopback(OE):1 v4l2loopback_dc(OE):2 [last unloaded: v4l2loopback(OE)]
[ 122.188437] [ T5971] CPU: 13 UID: 1000 PID: 5971 Comm: wireplumber Tainted: G W OE 6.18.4-vanilla-customconfig-clang #2 PREEMPT(lazy) c27cc6abfe3a08a6bb12b58d3c8eb9d5f5a1ee27
[ 122.188441] [ T5971] Tainted: [W]=WARN, [O]=OOT_MODULE, [E]=UNSIGNED_MODULE
[ 122.188442] [ T5971] Hardware name: GPD G1619-04/G1619-04, BIOS 0.42 10/22/2024
[ 122.188443] [ T5971] RIP: 0010:v4l2_open+0xc8/0x140 [videodev]
[ 122.188448] [ T5971] Code: c0 49 f7 87 48 04 00 00 02 00 00 00 74 1c 41 f6 87 68 04 00 00 04 75 37 85 c0 74 5f 48 89 df 89 c3 e8 2c 40 31 f6 89 d8 eb 53 <0f> 0b 49 8b 87 a8 00 00 00 4c 89 f7 4c 8b 58 48 2e 2e 2e 41 ff d3
[ 122.188450] [ T5971] RSP: 0018:ffffcc3ef6697850 EFLAGS: 00010246
[ 122.188451] [ T5971] RAX: 0000000000000000 RBX: ffff8acec92710b8 RCX: 0000000000000000
[ 122.188452] [ T5971] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[ 122.188453] [ T5971] RBP: 00000000fffffffa R08: 0000000000000000 R09: 0000000000000000
[ 122.188454] [ T5971] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffffc1ed6ca8
[ 122.188455] [ T5971] R13: 0000000000000001 R14: ffff8accc7fb9680 R15: ffff8acec9271000
[ 122.188456] [ T5971] FS: 00007ff6c501f4c0(0000) GS:ffff8ad8324cd000(0000) knlGS:0000000000000000
[ 122.188457] [ T5971] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 122.188458] [ T5971] CR2: 000055b5d4946cc8 CR3: 000000021abab000 CR4: 0000000000f50ef0
[ 122.188459] [ T5971] PKRU: 55555554
[ 122.188459] [ T5971] Call Trace:
[ 122.188461] [ T5971] <TASK>
[ 122.188463] [ T5971] chrdev_open+0x1fe/0x2f0
[ 122.188466] [ T5971] ? base_probe+0x60/0x60
[ 122.188468] [ T5971] do_dentry_open+0x397/0x5b0
[ 122.188470] [ T5971] vfs_open+0x26/0xf0
[ 122.188472] [ T5971] path_openat+0xeb1/0x1150
[ 122.188474] [ T5971] do_filp_open+0xcf/0x190
[ 122.188477] [ T5971] do_sys_openat2+0xa5/0x1a0
[ 122.188479] [ T5971] __x64_sys_openat+0x80/0xb0
[ 122.188480] [ T5971] do_syscall_64+0x81/0x300
[ 122.188483] [ T5971] ? srso_alias_return_thunk+0x5/0xfbef5
[ 122.188485] [ T5971] ? ep_modify+0x315/0x400
[ 122.188487] [ T5971] ? srso_alias_return_thunk+0x5/0xfbef5
[ 122.188488] [ T5971] ? do_epoll_ctl+0x51c/0x580
[ 122.188490] [ T5971] ? srso_alias_return_thunk+0x5/0xfbef5
[ 122.188491] [ T5971] ? __x64_sys_epoll_ctl+0x80/0xc0
[ 122.188492] [ T5971] ? srso_alias_return_thunk+0x5/0xfbef5
[ 122.188493] [ T5971] ? do_syscall_64+0x1e1/0x300
[ 122.188496] [ T5971] entry_SYSCALL_64_after_hwframe+0x55/0x5d
[ 122.188498] [ T5971] RIP: 0033:0x7ff6c4e9ca52
[ 122.188499] [ T5971] Code: 08 0f 85 e1 43 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 f3 0f 1e fa 48 83 ec 08
[ 122.188500] [ T5971] RSP: 002b:00007ffe76a1d568 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
[ 122.188502] [ T5971] RAX: ffffffffffffffda RBX: 00005597679ed1d0 RCX: 00007ff6c4e9ca52
[ 122.188502] [ T5971] RDX: 0000000000000802 RSI: 00005597679ed148 RDI: ffffffffffffff9c
[ 122.188503] [ T5971] RBP: 00005597679ed148 R08: 0000000000000000 R09: 0000000000000000
[ 122.188504] [ T5971] R10: 0000000000000000 R11: 0000000000000246 R12: 00005597679ed120
[ 122.188504] [ T5971] R13: 0000559767646440 R14: 0000559767740980 R15: 0000000000000000
[ 122.188506] [ T5971] </TASK>
[ 122.188506] [ T5971] ---[ end trace 0000000000000000 ]---
I am on vanilla Linux kernel 6.18.4 from kernel.org, self compiled, with CLANG, using this kernel configuration.
I also attach full dmesg output: dmesg.log.
Note that I observe this already since some kernel versions, and that I did observe this also before I got the USB errors I now have on my system.
Regards!