Additional info: BUG: unable to handle kernel NULL pointer dereference at 0000000000000058 IP: [<ffffffff8150e5bc>] hid_submit_ctrl+0x8c/0x2a0 PGD 2302a3067 PUD 2178a9067 PMD 0 Oops: 0002 [#1] SMP Modules linked in: fuse bnep bluetooth rfkill snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_seq coretemp snd_seq_device kvm_intel snd_pcm kvm snd_page_alloc snd_timer snd soundcore iTCO_wdt i2c_i801 iTCO_vendor_support lpc_ich mfd_core mei microcode e1000e serio_raw nfsd auth_rpcgss nfs_acl lockd sunrpc uinput raid0 crc32c_intel ghash_clmulni_intel ata_generic pata_acpi hid_logitech_dj usb_storage i915 video i2c_algo_bit drm_kms_helper drm i2c_core CPU 1 Pid: 886, comm: Xorg Not tainted 3.8.3-103.fc17.x86_64 #1 /DQ67OW RIP: 0010:[<ffffffff8150e5bc>] [<ffffffff8150e5bc>] hid_submit_ctrl+0x8c/0x2a0 RSP: 0018:ffff88022f5efc68 EFLAGS: 00010046 RAX: 0000000080000800 RBX: ffff88022de2c000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000020 RDI: ffff880219564000 RBP: ffff88022f5efca8 R08: 0000000000000020 R09: ffff8801e3945c21 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88021787f000 R13: ffff880219564000 R14: 000000000000000f R15: 0000000000000000 FS: 00007f85c7ed48c0(0000) GS:ffff88023e280000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000058 CR3: 00000002309d0000 CR4: 00000000000407e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process Xorg (pid: 886, threadinfo ffff88022f5ee000, task ffff8802196c1760) Stack: ffff8801ab684400 ffff880219564000 0000000000000000 ffff88022de2c000 ffff880219564000 0000000000000000 ffff880219564000 000000000000004c ffff88022f5efcd8 ffffffff8150edf0 ffff88021787f000 0000000000000000 Call Trace: [<ffffffff8150edf0>] usbhid_restart_ctrl_queue+0x90/0x130 [<ffffffff8150fe68>] __usbhid_submit_report+0x1c8/0x3a0 [<ffffffff81510182>] usbhid_submit_report+0x52/0x80 [<ffffffffa013410d>] logi_dj_ll_input_event+0x10d/0x180 [hid_logitech_dj] [<ffffffff814a6ace>] input_handle_event+0x8e/0x530 [<ffffffff814a6ffc>] input_inject_event+0x8c/0xa0 [<ffffffff814aadce>] evdev_write+0xde/0x160 [<ffffffff8119d35c>] vfs_write+0xac/0x180 [<ffffffff8119d6a2>] sys_write+0x52/0xa0 [<ffffffff810deb3c>] ? __audit_syscall_exit+0x20c/0x2c0 [<ffffffff81654cd9>] system_call_fastpath+0x16/0x1b Code: 8d 74 10 01 48 8b 87 b0 18 00 00 48 8b 53 30 48 8b 00 8b 80 78 ff ff ff c1 e0 08 84 c9 0f 85 fc 00 00 00 0d 00 00 00 80 4d 85 ff <89> 42 58 48 8b 43 30 44 89 b0 88 00 00 00 74 2e 48 8b bb 48 18 RIP [<ffffffff8150e5bc>] hid_submit_ctrl+0x8c/0x2a0 RSP <ffff88022f5efc68> CR2: 0000000000000058
System freezes after this error.
Benjamin, have you seen something like this before?
It looks like a duplicate of #881504 though the error is not exactly the same (here a kernel NULL pointer, vs a page fault). At least, the callstack is the same. Personally, I never encountered it, so I can only guess from the code what is happening. Tomislav, can you confirm that the bug is triggered when hitting capslock on any other key that triggers a LED?
Closing this bug as insufficient data as it has been needinfo for more than 2 weeks without a response, if you are still seeing this bug, feel free to reopen, but also comment with the requested information.