I also tested v4.15-rc5, which failed with the same stack trace. Then I returned to 4.14 mainline, and got this one:
[ 953.659489] BUG: unable to handle kernel NULL pointer dereference at 0000000000000d40 [ 953.668707] IP: search_free+0x31/0x40 [bcache] [ 953.674872] PGD 0 P4D 0 [ 953.677680] Oops: 0000 [#34] SMP [ 953.678796] Modules linked in: nls_utf8 isofs nls_iso8859_1 ppdev kvm_intel kvm irqbypass parport_pc joydev input_leds parport serio_raw mac_hid sch_fq_codel ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi virtio_rng ip_tables x_tables autofs4 btrfs zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear bcache psmouse virtio_scsi virtio_blk virtio_net i2c_piix4 floppy pata_acpi [ 953.700549] CPU: 1 PID: 3132 Comm: kworker/1:229 Tainted: G D 4.14.0-041400-generic #201711122031 [ 953.704522] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014 [ 953.707128] Workqueue: bcache bch_data_insert_keys [bcache] [ 953.708986] task: ffff985fe6050000 task.stack: ffffc01402c4c000 [ 953.711147] RIP: 0010:search_free+0x31/0x40 [bcache] [ 953.712997] RSP: 0018:ffffc01402c4fdf8 EFLAGS: 00010282 [ 953.714287] RAX: 0000000000000000 RBX: ffff985ffb385e78 RCX: ffffe83580d58e00 [ 953.716883] RDX: 0000000000000007 RSI: 000000000001f540 RDI: ffff985ffb385e78 [ 953.718731] RBP: ffffc01402c4fe00 R08: ffff985ff8121800 R09: 000000018010000f [ 953.720269] R10: ffffc01402c4fd70 R11: 0000000000000001 R12: ffff985fe3670010 [ 953.721583] R13: ffff985ffb386000 R14: ffff985fffc9bb40 R15: ffff985ff83eab40 [ 953.723315] FS: 0000000000000000(0000) GS:ffff985fffc80000(0000) knlGS:0000000000000000 [ 953.725738] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 953.727401] CR2: 0000000000000d40 CR3: 0000000028c09000 CR4: 00000000000006e0 [ 953.729737] Call Trace: [ 953.730687] cached_dev_cache_miss_done+0x38/0x80 [bcache] [ 953.732939] closure_put+0x8b/0xc0 [bcache] [ 953.734647] closure_sub+0x6f/0xc0 [bcache] [ 953.736104] bch_data_insert_keys+0xd8/0x130 [bcache] [ 953.737311] process_one_work+0x1e7/0x410 [ 953.738233] worker_thread+0x32/0x410 [ 953.739246] kthread+0x125/0x140 [ 953.740231] ? process_one_work+0x410/0x410 [ 953.741407] ? kthread_create_on_node+0x70/0x70 [ 953.742631] ret_from_fork+0x25/0x30 [ 953.743431] Code: 48 89 e5 53 48 89 fb e8 0e ff ff ff 48 8b bb 68 01 00 00 48 85 ff 74 05 e8 cd f7 2d e7 48 8b 83 e8 00 00 00 48 89 df 48 8b 40 70 <48> 8b b0 40 0d 00 00 e8 33 51 07 e7 5b 5d c3 0f 1f 44 00 00 55 [ 953.747654] RIP: search_free+0x31/0x40 [bcache] RSP: ffffc01402c4fdf8 [ 953.749962] CR2: 0000000000000d40 [ 953.751475] ---[ end trace c40c3beab1ff3af1 ]--- Retesting 4.13 mainline as well. -- 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/1784665 Title: mkfs.ext4 over /dev/bcache0 hangs Status in linux package in Ubuntu: In Progress Status in linux source package in Bionic: In Progress Status in linux source package in Cosmic: In Progress Bug description: $ cat /proc/version_signature Ubuntu 4.15.0-29.31-generic 4.15.18 $ lsb_release -rd Description: Ubuntu Cosmic Cuttlefish (development branch) Release: 18.10 $ apt-cache policy linux-image-`uname -r` linux-image-4.15.0-29-generic: Installed: 4.15.0-29.31 Candidate: 4.15.0-29.31 Version table: *** 4.15.0-29.31 500 500 http://archive.ubuntu.com/ubuntu cosmic/main amd64 Packages 100 /var/lib/dpkg/status 3) mkfs.ext4 /dev/bcache0 returns successful creating an ext4 filesystem on top of a bcache device 4) mkfs.ext4 doesn't return and kernel prints hung process info [ 58.018099] cloud-init[920]: Running command ['mkfs.ext4', '-F', '-L', 'root-fs', '-U', 'f01aec97-9457-11e8-b8d6-525400123401', '/dev/bcache0'] with allowed return codes [0] (capture=True) [ 242.652018] INFO: task kworker/u4:0:5 blocked for more than 120 seconds. [ 242.653767] Tainted: P O 4.15.0-29-generic #31-Ubuntu [ 242.655391] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 242.657397] INFO: task kworker/0:2:410 blocked for more than 120 seconds. [ 242.659126] Tainted: P O 4.15.0-29-generic #31-Ubuntu [ 242.660980] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 242.663000] INFO: task bcache_allocato:2326 blocked for more than 120 seconds. [ 242.664807] Tainted: P O 4.15.0-29-generic #31-Ubuntu [ 242.666516] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 242.668503] INFO: task bcache_writebac:2345 blocked for more than 120 seconds. [ 242.670301] Tainted: P O 4.15.0-29-generic #31-Ubuntu [ 242.671936] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 242.673909] INFO: task mkfs.ext4:2803 blocked for more than 120 seconds. [ 242.675414] Tainted: P O 4.15.0-29-generic #31-Ubuntu [ 242.677038] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 363.483998] INFO: task kworker/u4:0:5 blocked for more than 120 seconds. [ 363.488441] Tainted: P O 4.15.0-29-generic #31-Ubuntu [ 363.489598] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 363.491043] INFO: task kworker/0:2:410 blocked for more than 120 seconds. [ 363.492252] Tainted: P O 4.15.0-29-generic #31-Ubuntu [ 363.494085] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 363.495659] INFO: task bcache_allocato:2326 blocked for more than 120 seconds. [ 363.496957] Tainted: P O 4.15.0-29-generic #31-Ubuntu [ 363.498454] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 363.499866] INFO: task bcache_writebac:2345 blocked for more than 120 seconds. [ 363.501156] Tainted: P O 4.15.0-29-generic #31-Ubuntu [ 363.502597] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 363.504048] INFO: task mkfs.ext4:2803 blocked for more than 120 seconds. [ 363.505505] Tainted: P O 4.15.0-29-generic #31-Ubuntu [ 363.506677] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. System has two virtio block devices. bcache was created like so: make-bcache -C /dev/vdb make-bcache -B /dev/vda2 resulting in /dev/bcache0 ProblemType: Bug DistroRelease: Ubuntu 18.10 Package: linux-image-4.15.0-29-generic 4.15.0-29.31 ProcVersionSignature: User Name 4.15.0-29.31-generic 4.15.18 Uname: Linux 4.15.0-29-generic x86_64 AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 Jul 31 15:52 seq crw-rw---- 1 root audio 116, 33 Jul 31 15:52 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay' ApportVersion: 2.20.10-0ubuntu7 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CRDA: N/A Date: Tue Jul 31 15:53:56 2018 IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig' Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub MachineType: QEMU Standard PC (i440FX + PIIX, 1996) PciMultimedia: ProcEnviron: TERM=xterm PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=C.UTF-8 SHELL=/bin/bash ProcFB: ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-29-generic root=LABEL=cloudimg-rootfs ro console=tty1 console=ttyS0 RelatedPackageVersions: linux-restricted-modules-4.15.0-29-generic N/A linux-backports-modules-4.15.0-29-generic N/A linux-firmware N/A RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill' SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 04/01/2014 dmi.bios.vendor: SeaBIOS dmi.bios.version: 1.11.1-1 dmi.chassis.type: 1 dmi.chassis.vendor: QEMU dmi.chassis.version: pc-i440fx-bionic dmi.modalias: dmi:bvnSeaBIOS:bvr1.11.1-1:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-bionic:cvnQEMU:ct1:cvrpc-i440fx-bionic: dmi.product.name: Standard PC (i440FX + PIIX, 1996) dmi.product.version: pc-i440fx-bionic dmi.sys.vendor: QEMU To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1784665/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
