BTW, for future searchers, I've uploaded dmesg.202004081903 separately, and pasted the crash here:
[ 194.444436] bcache: bch_journal_replay() journal replay done, 3 keys in 6 entries, seq 23285862 [ 194.444622] bcache: register_cache() registered cache device sdb1 [ 194.448381] bcache: register_bdev() registered backing device md0 [ 194.602075] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008 [ 194.602100] IP: create_empty_buffers+0x29/0xf0 [ 194.602110] PGD 0 P4D 0 [ 194.602121] Oops: 0000 [#1] SMP NOPTI [ 194.602137] Modules linked in: bcache ebtable_filter ebtables ip6table_filter ip6_tables devlink iptable_filter pps_ldisc aufs overlay cmac bnep bonding bridge stp llc arc4 snd_hda_codec_hdmi nls_iso8859_1 edac_mce_amd kvm_amd kvm irqbypass rtl8xxxu mac80211 btusb btrtl btbcm snd_hda_intel btintel snd_hda_codec bluetooth cfg80211 eeepc_wmi snd_hda_core asus_wmi joydev sparse_keymap snd_hwdep wmi_bmof input_leds snd_pcm ecdh_generic snd_timer snd soundcore ccp k10temp shpchp mac_hid sch_fq_codel ib_iser rdma_cm iw_cm ib_cm ib_core nfsd iscsi_tcp libiscsi_tcp auth_rpcgss libiscsi nfs_acl scsi_transport_iscsi lockd grace sunrpc ip_tables x_tables autofs4 btrfs zstd_compress algif_skcipher af_alg dm_crypt raid10 raid1 raid0 multipath linear raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx [ 194.602323] xor raid6_pq libcrc32c hid_logitech_hidpp hid_logitech_dj hid_generic usbhid hid nouveau crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc mxm_wmi video ttm drm_kms_helper aesni_intel syscopyarea sysfillrect igb sysimgblt aes_x86_64 fb_sys_fops crypto_simd glue_helper dca cryptd i2c_algo_bit drm i2c_piix4 ptp ahci nvme pps_core libahci nvme_core gpio_amdpt wmi gpio_generic [ 194.602406] CPU: 1 PID: 4403 Comm: bcache-register Not tainted 4.15.0-91-generic #92-Ubuntu [ 194.602425] Hardware name: System manufacturer System Product Name/PRIME X370-PRO, BIOS 4207 12/08/2018 [ 194.602447] RIP: 0010:create_empty_buffers+0x29/0xf0 [ 194.602459] RSP: 0018:ffffa833cc37f7a8 EFLAGS: 00010246 [ 194.602471] RAX: 0000000000000000 RBX: fffff6227c3f4c00 RCX: 0000000000000013 [ 194.602487] RDX: 0000000000000000 RSI: 0000000000080000 RDI: fffff6227c3f4c00 [ 194.602503] RBP: ffffa833cc37f7c0 R08: 0000000000000001 R09: dead0000000000ff [ 194.602519] R10: ffff8976ca4f7aa0 R11: 0000000000000000 R12: 0000000000000000 [ 194.602535] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000200 [ 194.602551] FS: 00007f51c3bb2500(0000) GS:ffff89771ec40000(0000) knlGS:0000000000000000 [ 194.602569] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 194.602582] CR2: 0000000000000008 CR3: 0000000f24aea000 CR4: 00000000003406e0 [ 194.602598] Call Trace: [ 194.602606] create_page_buffers+0x51/0x60 [ 194.602616] block_read_full_page+0x4e/0x370 [ 194.602626] ? set_init_blocksize+0x80/0x80 [ 194.602636] blkdev_readpage+0x18/0x20 [ 194.602646] do_read_cache_page+0x2a2/0x580 [ 194.602656] ? blkdev_writepages+0x40/0x40 [ 194.602667] ? update_load_avg+0x57f/0x6e0 [ 194.602676] read_cache_page+0x15/0x20 [ 194.602687] read_dev_sector+0x2d/0xd0 [ 194.602696] read_lba+0x130/0x220 [ 194.602704] ? efi_partition+0x11a/0x790 [ 194.602713] efi_partition+0x138/0x790 [ 194.602723] ? string+0x60/0x90 [ 194.602731] ? vsnprintf+0xfb/0x510 [ 194.602740] ? snprintf+0x45/0x70 [ 194.602748] ? is_gpt_valid.part.6+0x420/0x420 [ 194.602760] check_partition+0x130/0x230 [ 194.603304] ? check_partition+0x130/0x230 [ 194.603837] rescan_partitions+0xaa/0x350 [ 194.604372] bdev_disk_changed+0x53/0x60 [ 194.604895] __blkdev_get+0x34a/0x510 [ 194.605413] blkdev_get+0x129/0x320 [ 194.605930] ? wake_up_bit+0x42/0x50 [ 194.606445] ? unlock_new_inode+0x4c/0x80 [ 194.606947] ? bdget+0x108/0x120 [ 194.607432] device_add_disk+0x38b/0x490 [ 194.607909] ? bcache_dev_sectors_dirty_add+0xb0/0xb0 [bcache] [ 194.608373] bch_cached_dev_run.part.28+0x42/0x1a0 [bcache] [ 194.608821] ? wait_woken+0x80/0x80 [ 194.609258] bch_cached_dev_attach+0x3b5/0x4f0 [bcache] [ 194.609681] ? vprintk_func+0x47/0xc0 [ 194.610088] ? printk+0x52/0x6e [ 194.610479] register_bcache+0x864/0x1110 [bcache] [ 194.610861] ? register_bcache+0x864/0x1110 [bcache] [ 194.611227] kobj_attr_store+0x12/0x20 [ 194.611580] ? kobj_attr_store+0x12/0x20 [ 194.611925] sysfs_kf_write+0x3c/0x50 [ 194.612259] kernfs_fop_write+0x125/0x1a0 [ 194.612595] __vfs_write+0x1b/0x40 [ 194.612921] vfs_write+0xb1/0x1a0 [ 194.613245] SyS_write+0x5c/0xe0 [ 194.613565] do_syscall_64+0x73/0x130 [ 194.613886] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 194.614212] RIP: 0033:0x7f51c36b8154 [ 194.614530] RSP: 002b:00007ffd27009a58 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 194.614858] RAX: ffffffffffffffda RBX: 0000000000000009 RCX: 00007f51c36b8154 [ 194.615183] RDX: 0000000000000009 RSI: 0000560160a77260 RDI: 0000000000000003 [ 194.615506] RBP: 0000560160a77260 R08: 0000000000000000 R09: 00007f51c37163a0 [ 194.615831] R10: 00000000fffffff8 R11: 0000000000000246 R12: 00007ffd27009af0 [ 194.616157] R13: 0000000000000009 R14: 00007f51c39902a0 R15: 00007f51c398f760 [ 194.616486] Code: 00 00 0f 1f 44 00 00 55 48 89 e5 41 55 41 54 53 49 89 d5 ba 01 00 00 00 48 89 fb e8 22 ff ff ff 49 89 c4 48 89 c2 eb 03 48 89 ca <48> 8b 4a 08 4c 09 2a 48 85 c9 75 f1 4c 89 62 08 48 8b 43 08 48 [ 194.617194] RIP: create_empty_buffers+0x29/0xf0 RSP: ffffa833cc37f7a8 [ 194.617557] CR2: 0000000000000008 ** Attachment added: "dmesg.202004081903" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1867916/+attachment/5349895/+files/dmesg.202004081903 -- 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/1867916 Title: Regression in kernel 4.15.0-91 causes kernel panic with Bcache Status in linux package in Ubuntu: In Progress Bug description: After upgrading from kernel 4.15.0-88 to 4.15.0-91 one of our systems does not boot any longer. It always crashes during boot with a kernel panic. I suspect that this crash might be related to Bcache because this is the only one of our systems where we use Bcache and the kernel panic appears right after Bcache initialization. I already checked that this bug still exists in the 4.15.0-92.93 kernel from proposed. Unfortunately, I cannot do a bisect because this is a critical production system and we do not have any other system with a similar configuration. I attached a screenshot with the trace of the kernel panic. The last message that appears before the kernel panic (or rather the last one that I can see - there is a rather long pause between that message and the panic and I cannot scroll up far enough to ensure that there are no other messages in between) is: bcache: register_bcache() error /dev/dm-0: device already registered When booting with kernel 4.15.0-88 that does not have this problem, the next message is bcache: register_bcache() error /dev/dm-12: device already registered (emitting change event) After that the next message is: Begin: Loading essential drivers ... done This message also appears after the kernel panic, but the boot process stalls and the system can only be recovered by doing a hardware reset. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: linux-image-4.15.0-88-generic 4.15.0-88.88 ProcVersionSignature: Ubuntu 4.15.0-88.88-generic 4.15.18 Uname: Linux 4.15.0-88-generic x86_64 AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 Mar 17 21:08 seq crw-rw---- 1 root audio 116, 33 Mar 17 21:08 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay' ApportVersion: 2.20.9-0ubuntu7.11 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: Date: Wed Mar 18 12:55:18 2020 HibernationDevice: RESUME=UUID=40512ea2-9fce-40f5-8362-5daf955cc26a InstallationDate: Installed on 2013-07-02 (2450 days ago) InstallationMedia: Ubuntu-Server 12.04.2 LTS "Precise Pangolin" - Release amd64 (20130214) MachineType: HP ProLiant DL160 G6 PciMultimedia: ProcFB: 0 mgadrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-88-generic root=/dev/mapper/vg0-root ro nosmt nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw RelatedPackageVersions: linux-restricted-modules-4.15.0-88-generic N/A linux-backports-modules-4.15.0-88-generic N/A linux-firmware 1.173.16 RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill' SourcePackage: linux UpgradeStatus: Upgraded to bionic on 2018-09-23 (541 days ago) dmi.bios.date: 11/06/2009 dmi.bios.vendor: HP dmi.bios.version: O33 dmi.chassis.asset.tag: 0191525 dmi.chassis.type: 23 dmi.chassis.vendor: HP dmi.modalias: dmi:bvnHP:bvrO33:bd11/06/2009:svnHP:pnProLiantDL160G6:pvr:cvnHP:ct23:cvr: dmi.product.name: ProLiant DL160 G6 dmi.sys.vendor: HP To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1867916/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
