Hi folks, Yesterday I got a kernel dump on switching off my USB disk docking station (2 slots, 2 different disks were inserted, none active). When I tried to login this morning the PC became unresponsive. I had to power-cycle. Its a Debian kernel (4.19.67-2+deb10u1), but I wonder does this ring a bell? See https://bugs.debian.org/943939 for the whole kern.log file. Oct 31 16:26:44 dpcl082 kernel: [22985.418721] usb 6-2: USB disconnect, device number 2 Oct 31 16:26:44 dpcl082 kernel: [22985.420074] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 Oct 31 16:26:44 dpcl082 kernel: [22985.420084] PGD 0 P4D 0 Oct 31 16:26:44 dpcl082 kernel: [22985.420096] Oops: 0000 [#1] SMP PTI Oct 31 16:26:44 dpcl082 kernel: [22985.420106] CPU: 6 PID: 115566 Comm: kworker/6:3 Tainted: P OE 4.19.0-6-amd64 #1 Debian 4.19.67-2+deb10u1 Oct 31 16:26:44 dpcl082 kernel: [22985.420110] Hardware name: /DH87MC, BIOS MCH8710H.86A.0164.2018.1023.1532 10/23/2018 Oct 31 16:26:44 dpcl082 kernel: [22985.420140] Workqueue: usb_hub_wq hub_event [usbcore] Oct 31 16:26:44 dpcl082 kernel: [22985.420150] RIP: 0010:strcmp+0x10/0x20 Oct 31 16:26:44 dpcl082 kernel: [22985.420155] Code: 00 48 c7 c0 f9 ff ff ff eb 92 45 31 c0 eb c1 48 c7 c0 f9 ff ff ff c3 0f 1f 00 31 c0 eb 08 48 83 c0 01 84 d2 74 0f 0f b6 14 07 <3a> 14 06 74 ef 19 c0 83 c8 01 c3 3 Oct 31 16:26:44 dpcl082 kernel: [22985.420159] RSP: 0018:ffffc2ee8a5779b0 EFLAGS: 00010246 Oct 31 16:26:44 dpcl082 kernel: [22985.420164] RAX: 0000000000000000 RBX: ffff9ef26fdd1018 RCX: ffffffff8469668f Oct 31 16:26:44 dpcl082 kernel: [22985.420167] RDX: 0000000000000069 RSI: 0000000000000000 RDI: ffffffff84696687 Oct 31 16:26:44 dpcl082 kernel: [22985.420171] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff83aef500 Oct 31 16:26:44 dpcl082 kernel: [22985.420174] R10: ffff9ef26fdd17f8 R11: 0000000000000001 R12: 0000000074a4fb33 Oct 31 16:26:44 dpcl082 kernel: [22985.420177] R13: ffffffff84696687 R14: ffff9ef26fe3d880 R15: ffff9ef27afe6430 Oct 31 16:26:44 dpcl082 kernel: [22985.420182] FS: 0000000000000000(0000) GS:ffff9ef27eb80000(0000) knlGS:0000000000000000 Oct 31 16:26:44 dpcl082 kernel: [22985.420186] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Oct 31 16:26:44 dpcl082 kernel: [22985.420189] CR2: 0000000000000000 CR3: 000000015ae0a004 CR4: 00000000001606e0 Oct 31 16:26:44 dpcl082 kernel: [22985.420192] Call Trace: Oct 31 16:26:44 dpcl082 kernel: [22985.420204] kernfs_find_ns+0x59/0xc0 Oct 31 16:26:44 dpcl082 kernel: [22985.420213] kernfs_remove_by_name_ns+0x31/0x90 Oct 31 16:26:44 dpcl082 kernel: [22985.420219] remove_files.isra.1+0x30/0x70 Oct 31 16:26:44 dpcl082 kernel: [22985.420226] sysfs_remove_group+0x3d/0x80 Oct 31 16:26:44 dpcl082 kernel: [22985.420233] sysfs_remove_groups+0x29/0x40 Oct 31 16:26:44 dpcl082 kernel: [22985.420244] device_remove_attrs+0x53/0x80 Oct 31 16:26:44 dpcl082 kernel: [22985.420250] device_del+0x15c/0x380 Oct 31 16:26:44 dpcl082 kernel: [22985.420257] del_gendisk+0x23a/0x2e0 Oct 31 16:26:44 dpcl082 kernel: [22985.420268] sd_remove+0x5d/0xd0 [sd_mod] Oct 31 16:26:44 dpcl082 kernel: [22985.420277] device_release_driver_internal+0x183/0x250 Oct 31 16:26:44 dpcl082 kernel: [22985.420283] bus_remove_device+0xe5/0x150 Oct 31 16:26:44 dpcl082 kernel: [22985.420288] device_del+0x164/0x380 Oct 31 16:26:44 dpcl082 kernel: [22985.420296] ? mutex_lock+0xe/0x30 Oct 31 16:26:44 dpcl082 kernel: [22985.420321] ? ata_tlink_match+0x30/0x30 [libata] Oct 31 16:26:44 dpcl082 kernel: [22985.420343] __scsi_remove_device+0x115/0x150 [scsi_mod] Oct 31 16:26:44 dpcl082 kernel: [22985.420361] scsi_forget_host+0x57/0x60 [scsi_mod] Oct 31 16:26:44 dpcl082 kernel: [22985.420376] scsi_remove_host+0x72/0x100 [scsi_mod] Oct 31 16:26:44 dpcl082 kernel: [22985.420385] uas_disconnect+0x80/0xa0 [uas] Oct 31 16:26:44 dpcl082 kernel: [22985.420406] usb_unbind_interface+0x78/0x260 [usbcore] Oct 31 16:26:44 dpcl082 kernel: [22985.420416] device_release_driver_internal+0x183/0x250 Oct 31 16:26:44 dpcl082 kernel: [22985.420422] bus_remove_device+0xe5/0x150 Oct 31 16:26:44 dpcl082 kernel: [22985.420426] device_del+0x164/0x380 Oct 31 16:26:44 dpcl082 kernel: [22985.420448] usb_disable_device+0x93/0x240 [usbcore] Oct 31 16:26:44 dpcl082 kernel: [22985.420466] usb_disconnect+0xbc/0x250 [usbcore] Oct 31 16:26:44 dpcl082 kernel: [22985.420486] hub_event+0xc91/0x15b0 [usbcore] Oct 31 16:26:44 dpcl082 kernel: [22985.420497] process_one_work+0x1a7/0x3a0 Oct 31 16:26:44 dpcl082 kernel: [22985.420504] worker_thread+0x30/0x390 Oct 31 16:26:44 dpcl082 kernel: [22985.420511] ? create_worker+0x1a0/0x1a0 Oct 31 16:26:44 dpcl082 kernel: [22985.420516] kthread+0x112/0x130 Oct 31 16:26:44 dpcl082 kernel: [22985.420522] ? kthread_bind+0x30/0x30 Oct 31 16:26:44 dpcl082 kernel: [22985.420529] ret_from_fork+0x35/0x40 Oct 31 16:26:44 dpcl082 kernel: [22985.420535] Modules linked in: tcp_diag udp_diag inet_diag xt_conntrack devlink pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) cpufreq_powersave cpufreq_userspace c Oct 31 16:26:44 dpcl082 kernel: [22985.420621] pcc_cpufreq intel_rapl_perf video button squashfs loop nvidia_drm(POE) drm_kms_helper drm dm_mod nvidia_modeset(POE) nvidia(POE) ipmi_devintf ipmi_msghandler xt_recent Oct 31 16:26:44 dpcl082 kernel: [22985.420722] libahci sata_sil24 ehci_pci xhci_hcd libata ehci_hcd crc32c_intel aesni_intel scsi_mod usbcore aes_x86_64 e1000e crypto_simd lpc_ich cryptd glue_helper i2c_i801 usb_co Oct 31 16:26:44 dpcl082 kernel: [22985.420749] CR2: 0000000000000000 Oct 31 16:26:44 dpcl082 kernel: [22985.420755] ---[ end trace d5223c8be8056120 ]--- Oct 31 16:26:44 dpcl082 kernel: [22985.420761] RIP: 0010:strcmp+0x10/0x20 Oct 31 16:26:44 dpcl082 kernel: [22985.420765] Code: 00 48 c7 c0 f9 ff ff ff eb 92 45 31 c0 eb c1 48 c7 c0 f9 ff ff ff c3 0f 1f 00 31 c0 eb 08 48 83 c0 01 84 d2 74 0f 0f b6 14 07 <3a> 14 06 74 ef 19 c0 83 c8 01 c3 3 Oct 31 16:26:44 dpcl082 kernel: [22985.420768] RSP: 0018:ffffc2ee8a5779b0 EFLAGS: 00010246 Oct 31 16:26:44 dpcl082 kernel: [22985.420772] RAX: 0000000000000000 RBX: ffff9ef26fdd1018 RCX: ffffffff8469668f Oct 31 16:26:44 dpcl082 kernel: [22985.420776] RDX: 0000000000000069 RSI: 0000000000000000 RDI: ffffffff84696687 Oct 31 16:26:44 dpcl082 kernel: [22985.420779] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff83aef500 Oct 31 16:26:44 dpcl082 kernel: [22985.420782] R10: ffff9ef26fdd17f8 R11: 0000000000000001 R12: 0000000074a4fb33 Oct 31 16:26:44 dpcl082 kernel: [22985.420785] R13: ffffffff84696687 R14: ffff9ef26fe3d880 R15: ffff9ef27afe6430 Oct 31 16:26:44 dpcl082 kernel: [22985.420789] FS: 0000000000000000(0000) GS:ffff9ef27eb80000(0000) knlGS:0000000000000000 Oct 31 16:26:44 dpcl082 kernel: [22985.420792] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Oct 31 16:26:44 dpcl082 kernel: [22985.420795] CR2: 0000000000000000 CR3: 000000015ae0a004 CR4: 00000000001606e0 Oct 31 16:26:47 dpcl082 kernel: [22988.491496] usb 2-5: USB disconnect, device number 6 Oct 31 16:34:38 dpcl082 kernel: [23459.024960] sd 7:0:0:1: [sdf] tag#12 FAILED Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK Oct 31 16:34:38 dpcl082 kernel: [23459.024973] sd 7:0:0:1: [sdf] tag#12 CDB: ATA command pass through(16) 85 06 20 00 00 00 00 00 00 00 00 00 00 00 e5 00 Oct 31 16:34:38 dpcl082 kernel: [23459.627631] sd 7:0:0:1: [sdf] tag#26 FAILED Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK Oct 31 16:34:38 dpcl082 kernel: [23459.627640] sd 7:0:0:1: [sdf] tag#26 CDB: ATA command pass through(16) 85 06 2c 00 00 00 00 00 00 00 00 00 00 00 e5 00 Oct 31 17:04:39 dpcl082 kernel: [25260.222715] sd 7:0:0:1: [sdf] tag#25 FAILED Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK Oct 31 17:04:39 dpcl082 kernel: [25260.222720] sd 7:0:0:1: [sdf] tag#25 CDB: ATA command pass through(16) 85 06 2c 00 00 00 00 00 00 00 00 00 00 00 e5 00 Regards Harri
