general protection fault: 0000 [#1] PREEMPT SMP Modules linked in: ppp_deflate bsd_comp rfcomm bnep btusb btrtl btbcm btintel bluetooth xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp tun bridge stp llc ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables ctr ccm af_packet ath9k ath9k_common ath9k_hw ath ppp_async ppp_generic slhc capi kernelcapi binfmt_misc msr iTCO_wdt iTCO_vendor_support arc4 uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core videodev media iwl4965 iwlegacy acer_wmi mac80211 sparse_keymap cfg80211 snd_hda_codec_hdmi coretemp snd_hda_codec_realtek joydev snd_hda_codec_generic i2c_i801 i2c_smbus snd_hda_intel tg3 rfkill lpc_ich mfd_core snd_hda_codec ptp pps_core nsc_ircc libphy snd_hda_core irda wmi snd_hwdep snd_pcm thermal snd_timer battery ac snd mac_hid soundcore tpm_tis tpm_tis_core tpm cpufreq_conservative cpufreq_powersave acpi_cpufreq evdev tifm_sd tifm_7xx1 tifm_core sdhci_pci nvram sg nfsd auth_rpcgss oid_registry exportfs nfs_acl lockd grace sunrpc ipv6 crc_ccitt autofs4 ext4 crc16 jbd2 fscrypto pcmcia uhci_hcd ehci_pci mmc_block ehci_hcd sdhci usbcore serio_raw mmc_core sd_mod yenta_socket sr_mod pcmcia_rsrc pcmcia_core usb_common i915 video button i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops drm i2c_core ahci libahci ata_generic pata_acpi ata_piix libata scsi_mod CPU: 1 PID: 21933 Comm: ppp-watch Tainted: G U W 4.9.0-rc7xrg3 #1 Hardware name: Acer Extensa 5620 /Columbia , BIOS V1.32 02/01/2008 task: ffff88004cb4a640 task.stack: ffffc90001504000 RIP: 0010:[] [] skb_queue_tail+0x68/0x89 RSP: 0018:ffffc90001507c58 EFLAGS: 00010006 RAX: 0000000000000286 RBX: ffff88002b514c18 RCX: 0000000000000000 RDX: 0000000000000001 RSI: ffff8800b982ec00 RDI: ffff88002b514c30 RBP: ffffc90001507c80 R08: 0000000000000000 R09: 0000000000000000 R10: ffffc90001507d98 R11: ffff88004cb4a640 R12: ffff8800b982ec00 R13: 0020050000000000 R14: ffff88002b514c30 R15: 0000000000000286 FS: 00007f7da8bca700(0000) GS:ffff8800bf300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000001619de8 CR3: 0000000050640000 CR4: 00000000000006e0 Stack: ffff88002b514c00 ffff8800b982ec00 ffff880078290400 ffff88002b514c00 ffff8800b982ec00 ffffc90001507ca8 ffffffffa1128360 0000000000000009 0000000000000001 0000000000000001 ffffc90001507d08 ffffffffa112d91f Call Trace: [] rfcomm_dlc_send_noerror+0x54/0xd1 [rfcomm] [] rfcomm_tty_write+0x128/0x19f [rfcomm] [] n_tty_write+0x4e9/0x591 [] ? wake_atomic_t_function+0x95/0x95 [] tty_write+0x23a/0x307 [] ? signal_pending+0x28/0x28 [] __vfs_write+0x5e/0x11a [] ? security_file_permission+0x4f/0x56 [] ? rw_verify_area+0x11a/0x126 [] vfs_write+0xd4/0x143 [] SyS_write+0x4b/0x79 [] do_syscall_64+0x7f/0x92 [] entry_SYSCALL64_slow_path+0x25/0x25 Code: 0e 31 f6 48 c7 c7 40 7d 05 82 e8 4e b7 df ff 4d 85 ed 49 89 1c 24 4d 89 6c 24 08 75 0e 31 f6 48 c7 c7 00 7d 05 82 e8 32 b7 df ff <4d> 89 65 00 4c 89 fe 4c 89 f7 ff 43 10 4c 89 63 08 e8 83 a9 11 RIP [] skb_queue_tail+0x68/0x89 RSP ---[ end trace 9340916f4aeec733 ]--- BUG: sleeping function called from invalid context at ./include/linux/sched.h:3111 in_atomic(): 1, irqs_disabled(): 1, pid: 21933, name: ppp-watch Preemption disabled at: [] preempt_count_add+0x60/0x63 CPU: 1 PID: 21933 Comm: ppp-watch Tainted: G UD W 4.9.0-rc7xrg3 #1 Hardware name: Acer Extensa 5620 /Columbia , BIOS V1.32 02/01/2008 ffffc90001507e28 ffffffff8136f227 0000000000000082 0000000000000001 0000000000000000 ffffc90001507e60 ffffffff810ae3f9 ffff88004cb4a640 ffffffff81904b66 0000000000000c27 0000000000000000 0000000000000286 Call Trace: [] dump_stack+0x50/0x6e [] ___might_sleep+0x23d/0x254 [] __might_sleep+0x8f/0x130 [] exit_signals+0x1e/0x1ac [] do_exit+0x1a6/0xf40 [] rewind_stack_do_exit+0x17/0x20 note: ppp-watch[21933] exited with preempt_count 1