looks like setserial problem. I do not know to whom it may belong, but I got 2 trace with 4.9.2. Please forward to correct developer. uname: Linux rocket2 4.9.0-0.bpo.1-amd64 #1 SMP Debian 4.9.2-2~bpo8+1 (2017-01-26) x86_64 GNU/Linux [ 13.735465] ------------[ cut here ]------------ [ 13.735481] WARNING: CPU: 1 PID: 525 at /home/zumbi/linux-4.9.2/lib/list_debug.c:36 __list_add+0xab/0xb0 [ 13.735485] list_add double add: new=ffffffffa0b47e98, prev=ffffffffa0b47e98, next=ffffffffa0b47e98. [ 13.735486] Modules linked in: joydev snd_hda_codec_realtek(+) snd_hda_codec_generic powernow_k8 edac_mce_amd edac_core kvm_amd evdev pcspkr serio_raw kvm irqbypass snd_hda_intel snd_hda_codec snd_h da_core snd_hwdep snd_pcm_oss snd_mixer_oss k8temp parport_serial snd_pcm button snd_timer snd soundcore shpchp i2c_nforce2 acpi_cpufreq tpm_tis tpm_tis_core tpm nvidia(POE) drm w83627ehf hwmon_vid fus e parport_pc ppdev lp parport autofs4 ext4 crc16 jbd2 fscrypto mbcache dm_mirror dm_region_hash dm_log dm_mod uas usb_storage hid_logitech_hidpp hid_logitech_dj usbhid hid sg sd_mod sr_mod cdrom psmous e r8169 mii ohci_pci ahci libahci libata fjes ohci_hcd scsi_mod ehci_pci ehci_hcd usbcore usb_common [ 13.735576] CPU: 1 PID: 525 Comm: setserial Tainted: P OE 4.9.0-0.bpo.1-amd64 #1 Debian 4.9.2-2~bpo8+1 [ 13.735578] Hardware name: MSI MS-7369/MS-7369, BIOS V2.9 03/17/2009 [ 13.735582] 0000000000000000 ffffffff9ff2a1f5 ffffa31c01103ad8 0000000000000000 [ 13.735589] ffffffff9fc77884 ffffffffa0b47e98 ffffa31c01103b30 ffffffffa0b47e98 [ 13.735595] ffff9142269f0bf4 0000000000000000 ffff914226884c00 ffffffff9fc778ff [ 13.735600] Call Trace: [ 13.735611] [<ffffffff9ff2a1f5>] ? dump_stack+0x5c/0x77 [ 13.735619] [<ffffffff9fc77884>] ? __warn+0xc4/0xe0 [ 13.735624] [<ffffffff9fc778ff>] ? warn_slowpath_fmt+0x5f/0x80 [ 13.735629] [<ffffffff9ff48e7b>] ? __list_add+0xab/0xb0 [ 13.735636] [<ffffffffa0035599>] ? univ8250_setup_irq+0x149/0x250 [ 13.735641] [<ffffffffa00387c8>] ? serial8250_do_startup+0x188/0x6d0 [ 13.735645] [<ffffffffa00328ef>] ? uart_startup.part.18+0x5f/0x140 [ 13.735651] [<ffffffffa001d8b6>] ? tty_port_open+0x86/0xd0 [ 13.735655] [<ffffffffa0030247>] ? uart_open+0x37/0x50 [ 13.735659] [<ffffffffa00163db>] ? tty_open+0xeb/0x670 [ 13.735665] [<ffffffff9fe0849e>] ? chrdev_open+0xbe/0x190 [ 13.735668] [<ffffffff9fe083e0>] ? cdev_put+0x20/0x20 [ 13.735673] [<ffffffff9fe00c23>] ? do_dentry_open+0x1d3/0x2e0 [ 13.735680] [<ffffffff9fe12389>] ? path_openat+0x2e9/0x14e0 [ 13.735686] [<ffffffff9fdc2961>] ? page_add_file_rmap+0x11/0x120 [ 13.735690] [<ffffffff9fe14801>] ? do_filp_open+0x91/0x100 [ 13.735694] [<ffffffff9fdb6f00>] ? handle_mm_fault+0xdd0/0x1650 [ 13.735698] [<ffffffff9fdfeddb>] ? __check_object_size+0x10b/0x1dc [ 13.735703] [<ffffffff9fe02387>] ? do_sys_open+0x127/0x210 [ 13.735710] [<ffffffffa01fa1bb>] ? system_call_fast_compare_end+0xc/0x9b [ 13.735714] ---[ end trace bf866f96a65b60aa ]--- direct after that: [ 13.740470] ------------[ cut here ]------------ [ 13.740487] WARNING: CPU: 1 PID: 527 at /home/zumbi/linux-4.9.2/lib/list_debug.c:36 __list_add+0xab/0xb0 [ 13.740490] list_add double add: new=ffffffffa0b480b0, prev=ffffffffa0b480b0, next=ffffffffa0b480b0. [ 13.740491] Modules linked in: joydev snd_hda_codec_realtek(+) snd_hda_codec_generic powernow_k8 edac_mce_amd edac_core kvm_amd evdev pcspkr serio_raw kvm irqbypass snd_hda_intel snd_hda_codec snd_h da_core snd_hwdep snd_pcm_oss snd_mixer_oss k8temp parport_serial snd_pcm button snd_timer snd soundcore shpchp i2c_nforce2 acpi_cpufreq tpm_tis tpm_tis_core tpm nvidia(POE) drm w83627ehf hwmon_vid fus e parport_pc ppdev lp parport autofs4 ext4 crc16 jbd2 fscrypto mbcache dm_mirror dm_region_hash dm_log dm_mod uas usb_storage hid_logitech_hidpp hid_logitech_dj usbhid hid sg sd_mod sr_mod cdrom psmous e r8169 mii ohci_pci ahci libahci libata fjes ohci_hcd scsi_mod ehci_pci ehci_hcd usbcore usb_common [ 13.740586] CPU: 1 PID: 527 Comm: setserial Tainted: P W OE 4.9.0-0.bpo.1-amd64 #1 Debian 4.9.2-2~bpo8+1 [ 13.740588] Hardware name: MSI MS-7369/MS-7369, BIOS V2.9 03/17/2009 [ 13.740592] 0000000000000000 ffffffff9ff2a1f5 ffffa31c01103ad8 0000000000000000 [ 13.740598] ffffffff9fc77884 ffffffffa0b480b0 ffffa31c01103b30 ffffffffa0b480b0 [ 13.740603] ffff9142290ec334 0000000000000000 ffff91422689b000 ffffffff9fc778ff [ 13.740608] Call Trace: [ 13.740620] [<ffffffff9ff2a1f5>] ? dump_stack+0x5c/0x77 [ 13.740628] [<ffffffff9fc77884>] ? __warn+0xc4/0xe0 [ 13.740633] [<ffffffff9fc778ff>] ? warn_slowpath_fmt+0x5f/0x80 [ 13.740638] [<ffffffff9ff48e7b>] ? __list_add+0xab/0xb0 [ 13.740645] [<ffffffffa0035599>] ? univ8250_setup_irq+0x149/0x250 [ 13.740650] [<ffffffffa00387c8>] ? serial8250_do_startup+0x188/0x6d0 [ 13.740654] [<ffffffffa00328ef>] ? uart_startup.part.18+0x5f/0x140 [ 13.740660] [<ffffffffa001d8b6>] ? tty_port_open+0x86/0xd0 [ 13.740664] [<ffffffffa0030247>] ? uart_open+0x37/0x50 [ 13.740668] [<ffffffffa00163db>] ? tty_open+0xeb/0x670 [ 13.740673] [<ffffffff9fe0849e>] ? chrdev_open+0xbe/0x190 [ 13.740677] [<ffffffff9fe083e0>] ? cdev_put+0x20/0x20 [ 13.740681] [<ffffffff9fe00c23>] ? do_dentry_open+0x1d3/0x2e0 [ 13.740688] [<ffffffff9fe12389>] ? path_openat+0x2e9/0x14e0 [ 13.740695] [<ffffffff9fdc2961>] ? page_add_file_rmap+0x11/0x120 [ 13.740699] [<ffffffff9fe14801>] ? do_filp_open+0x91/0x100 [ 13.740703] [<ffffffff9fdb6f00>] ? handle_mm_fault+0xdd0/0x1650 [ 13.740707] [<ffffffff9fdfeddb>] ? __check_object_size+0x10b/0x1dc [ 13.740712] [<ffffffff9fe02387>] ? do_sys_open+0x127/0x210 [ 13.740719] [<ffffffffa01fa1bb>] ? system_call_fast_compare_end+0xc/0x9b [ 13.740722] ---[ end trace bf866f96a65b60ab ]--- -- *Wolfgang Schnitker* Beethovenstraße 16 72535 Heroldstatt -- *Wolfgang Schnitker* Beethovenstraße 16 72535 Heroldstatt -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html