Another crash, with a different backtrace. with a different board, but related USB implementation. Since the report above, the underlying USB implementation on the boards has changed somewhat, but the circumstances of the crash are similar:
[40859.232293] usb 1-1.3: USB disconnect, device number 34 [40859.250102] FAT-fs (sdc): unable to read boot sector to mark fs as dirty [40862.270362] usb 1-1.3: new full-speed USB device number 35 using ehci-pci [40862.387543] usb 1-1.3: New USB device found, idVendor=239a, idProduct=8014, bcdDevice= 1.00 [40862.387546] usb 1-1.3: New USB device strings: Mfr=2, Product=3, SerialNumber=1 [40862.387548] usb 1-1.3: Product: Metro M0 Express [40862.387550] usb 1-1.3: Manufacturer: Adafruit Industries LLC [40862.387552] usb 1-1.3: SerialNumber: DFAE9D970323D4050213E2932141E0FF [40862.388969] cdc_acm 1-1.3:1.0: ttyACM0: USB ACM device [40862.392200] usb-storage 1-1.3:1.2: USB Mass Storage device detected [40862.392599] scsi host6: usb-storage 1-1.3:1.2 [40862.397276] input: Adafruit Industries LLC Metro M0 Express Keyboard as /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.3/1-1.3:1.3/0003:239A:8014.0016/input/input97 [40862.454787] input: Adafruit Industries LLC Metro M0 Express Mouse as /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.3/1-1.3:1.3/0003:239A:8014.0016/input/input98 [40862.455133] input: Adafruit Industries LLC Metro M0 Express Consumer Control as /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.3/1-1.3:1.3/0003:239A:8014.0016/input/input99 [40862.455322] input: Adafruit Industries LLC Metro M0 Express as /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.3/1-1.3:1.3/0003:239A:8014.0016/input/input100 [40862.455689] hid-generic 0003:239A:8014.0016: input,hidraw3: USB HID v1.11 Keyboard [Adafruit Industries LLC Metro M0 Express] on usb-0000:00:1a.0-1.3/input3 [40863.416330] scsi host6: scsi scan: INQUIRY result too short (5), using 36 [40863.416338] scsi 6:0:0:0: Direct-Access Adafruit Metro M0 Express 1.0 PQ: 0 ANSI: 2 [40863.416732] sd 6:0:0:0: Attached scsi generic sg3 type 0 [40863.418307] sd 6:0:0:0: [sdc] 4089 512-byte logical blocks: (2.09 MB/2.00 MiB) [40863.419611] sd 6:0:0:0: [sdc] Write Protect is off [40863.419615] sd 6:0:0:0: [sdc] Mode Sense: 03 00 00 00 [40863.420650] sd 6:0:0:0: [sdc] No Caching mode page found [40863.420656] sd 6:0:0:0: [sdc] Assuming drive cache: write through [40863.464434] sdc: sdc1 [40863.472071] sd 6:0:0:0: [sdc] Attached SCSI removable disk [40864.285807] FAT-fs (sdc1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck. [40866.329111] cdc_acm 1-1.3:1.0: failed to set dtr/rts [40866.349335] general protection fault: 0000 [#1] SMP PTI [40866.349339] CPU: 3 PID: 134345 Comm: systemd-udevd Kdump: loaded Not tainted 5.4.0-28-generic #32-Ubuntu [40866.349340] Hardware name: Dell Inc. OptiPlex 7010/0WR7PY, BIOS A29 06/28/2018 [40866.349346] RIP: 0010:kmem_cache_alloc_trace+0x88/0x230 [40866.349348] Code: 65 49 8b 50 08 65 4c 03 05 fd 95 36 60 4d 8b 38 4d 85 ff 0f 84 80 01 00 00 41 8b 59 20 49 8b 39 48 8d 4a 01 4c 89 f8 4c 01 fb <48> 33 1b 49 33 99 70 01 00 00 65 48 0f c7 0f 0f 94 c0 84 c0 74 bd [40866.349349] RSP: 0018:ffffa5f589357bf0 EFLAGS: 00010206 [40866.349350] RAX: 02f74afdcaf6e6c0 RBX: 02f74afdcaf6e6c0 RCX: 00000000001b8e41 [40866.349351] RDX: 00000000001b8e40 RSI: 0000000000000dc0 RDI: 000000000002f100 [40866.349352] RBP: ffffa5f589357c20 R08: ffff935a0e1af100 R09: ffff935a0c403180 [40866.349353] R10: 0000000000000001 R11: 0000000000000006 R12: 0000000000000dc0 [40866.349354] R13: 0000000000000098 R14: ffff935a0c403180 R15: 02f74afdcaf6e6c0 [40866.349355] FS: 00007f4619b2e880(0000) GS:ffff935a0e180000(0000) knlGS:0000000000000000 [40866.349356] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [40866.349357] CR2: 000055c433bfa8b0 CR3: 0000000111b80005 CR4: 00000000001606e0 [40866.349358] Call Trace: [40866.349363] ? kernfs_fop_open+0xc2/0x3b0 [40866.349366] kernfs_fop_open+0xc2/0x3b0 [40866.349368] ? kernfs_fop_read+0x1b0/0x1b0 [40866.349372] do_dentry_open+0x143/0x3a0 [40866.349373] vfs_open+0x2d/0x30 [40866.349376] do_last+0x194/0x900 [40866.349392] path_openat+0x8d/0x290 [40866.349394] do_filp_open+0x91/0x100 [40866.349397] ? __alloc_fd+0x46/0x150 [40866.349398] do_sys_open+0x17e/0x290 [40866.349400] __x64_sys_openat+0x20/0x30 [40866.349402] do_syscall_64+0x57/0x190 [40866.349405] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [40866.349407] RIP: 0033:0x7f461a0a3d1b [40866.349409] Code: 25 00 00 41 00 3d 00 00 41 00 74 4b 64 8b 04 25 18 00 00 00 85 c0 75 67 44 89 e2 48 89 ee bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 91 00 00 00 48 8b 4c 24 28 64 48 33 0c 25 [40866.349410] RSP: 002b:00007ffd5b8a6190 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 [40866.349411] RAX: ffffffffffffffda RBX: 000055c433b7e9b0 RCX: 00007f461a0a3d1b [40866.349412] RDX: 0000000000080000 RSI: 00007ffd5b8a6300 RDI: 00000000ffffff9c [40866.349413] RBP: 00007ffd5b8a6300 R08: 0000000000000008 R09: 0000000000000001 [40866.349413] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000080000 [40866.349414] R13: 000055c432f13390 R14: 000055c433962e60 R15: 00007ffd5b8a6398 [40866.349416] Modules linked in: nls_iso8859_1 rfcomm cmac algif_hash algif_skcipher af_alg bnep intel_rapl_msr intel_rapl_common x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm mei_hdcp crct10dif_pclmul ghash_clmulni_intel snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic aesni_intel ledtrig_audio crypto_simd cryptd glue_helper intel_cstate intel_rapl_perf snd_hda_intel snd_intel_dspcfg snd_hda_codec snd_usb_audio snd_hda_core snd_usbmidi_lib snd_hwdep snd_pcm snd_seq_midi btusb snd_seq_midi_event btrtl snd_rawmidi uvcvideo btbcm i915 snd_seq videobuf2_vmalloc videobuf2_memops btintel videobuf2_v4l2 dell_wmi binfmt_misc videobuf2_common dell_smbios snd_seq_device bluetooth drm_kms_helper videodev dcdbas snd_timer joydev i2c_algo_bit ecdh_generic cdc_acm input_leds snd mc ecc wmi_bmof serio_raw sparse_keymap fb_sys_fops dell_wmi_descriptor mei_me syscopyarea mei soundcore sysfillrect sysimgblt ie31200_edac mac_hid sch_fq_codel parport_pc ppdev lp parport drm sunrpc [40866.349443] ip_tables x_tables autofs4 uas usb_storage hid_generic usbhid hid crc32_pclmul psmouse i2c_i801 e1000e ahci libahci lpc_ich video wmi -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1871143 Title: Kernel crash during USB device enumeration or mounting Status in linux package in Ubuntu: Confirmed Bug description: Device is an Adafruit microcontroller board running https://github.com/adafruit/circuitpython, using the TinyUSB USB stack: https://github.com/hathach/tinyusb. Device presents a composite USB device that includes MSC, CDC, HID, and MIDI Device was commanded to forcibly reformat its MSC FAT12 filesystem and then reset, which causes a USB reset and re-enumeration. This causes some USB kernel code to crash, much of the time, though not quite all the time. I work for Adafruit and the maintainer of TinyUSB also works for Adafruit, so we can provide further help to track this down. Attached is the dmesg file for the crash. I tried uploading the dump file from kdump, but launchpad is timing out. The dump file is available at: https://drive.google.com/open?id=1ka3ySSccEMRSmnYgI9X16IndPDmIKTD6 ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: linux-image-5.4.0-21-generic 5.4.0-21.25 ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27 Uname: Linux 5.4.0-21-generic x86_64 ApportVersion: 2.20.11-0ubuntu24 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: halbert 1857 F.... pulseaudio /dev/snd/controlC2: halbert 1857 F.... pulseaudio CurrentDesktop: X-Cinnamon Date: Mon Apr 6 11:09:43 2020 HibernationDevice: RESUME=UUID=55694d39-bafe-45f8-ba05-ea5d54a93a85 InstallationDate: Installed on 2017-09-19 (929 days ago) InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2) IwConfig: eno1 no wireless extensions. lo no wireless extensions. MachineType: Dell Inc. OptiPlex 7010 ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-21-generic root=UUID=b3868153-c620-4efe-9dfc-8059dc6288a8 ro quiet splash crashkernel=512M-:192M vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-5.4.0-21-generic N/A linux-backports-modules-5.4.0-21-generic N/A linux-firmware 1.187 RfKill: 0: hci0: Bluetooth Soft blocked: yes Hard blocked: no SourcePackage: linux UpgradeStatus: Upgraded to focal on 2020-03-08 (28 days ago) dmi.bios.date: 06/28/2018 dmi.bios.vendor: Dell Inc. dmi.bios.version: A29 dmi.board.name: 0WR7PY dmi.board.vendor: Dell Inc. dmi.board.version: A01 dmi.chassis.type: 15 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA29:bd06/28/2018:svnDellInc.:pnOptiPlex7010:pvr01:rvnDellInc.:rn0WR7PY:rvrA01:cvnDellInc.:ct15:cvr: dmi.product.name: OptiPlex 7010 dmi.product.sku: OptiPlex 7010 dmi.product.version: 01 dmi.sys.vendor: Dell Inc. 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