Tested with bionic-proposed (problem exists) --- # uname -rv 4.15.0-56-generic #62-Ubuntu SMP Wed Jul 24 20:18:55 UTC 2019
# ./setup-bcache-wb_percent-before-attach.sh >/dev/null 2>&1 [ 39.096888] bcache: register_bdev() registered backing device loop0/null 2>&1 [ 39.109511] bcache: run_cache_set() invalidating existing data [ 39.121256] bcache: register_cache() registered cache device loop1 [ 43.083569] WARNING: CPU: 3 PID: 1207 at /build/linux-dHA1gi/linux-4.15.0/drivers/md/bcache/writeback.c:624 bch_cached_dev_writeback_sta$ t+0x13f/0x1b0 [bcache] [ 43.092279] Modules linked in: bcache isofs nls_iso8859_1 kvm_intel kvm irqbypass input_leds joydev serio_raw sch_fq_codel ib_iser rdma_$ m iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi ip_tables x_tables autofs4 btrfs zstd_compress raid10 raid456 as$ nc_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear psmouse virtio_blk virtio_net f$ oppy [ 43.107715] CPU: 3 PID: 1207 Comm: setup-bcache-wb Not tainted 4.15.0-56-generic #62-Ubuntu [ 43.111108] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014 [ 43.114797] RIP: 0010:bch_cached_dev_writeback_start+0x13f/0x1b0 [bcache] [ 43.117589] RSP: 0018:ffffbcb4c13a3d28 EFLAGS: 00010283 [ 43.119762] RAX: ffff9e8171f74080 RBX: ffff9e8172610000 RCX: 0000000000000000 [ 43.122664] RDX: 0000000000000000 RSI: ffff9e817fda70a0 RDI: ffff9e8177003800 [ 43.125572] RBP: ffffbcb4c13a3d30 R08: 00000000000270a0 R09: ffffffff826afc1d [ 43.128590] R10: 0000000000000000 R11: 0000000000000224 R12: ffff9e8172610010 [ 43.131574] R13: ffff9e8172610000 R14: ffff9e8172060000 R15: ffff9e8172610ac8 [ 43.134538] FS: 00007f2bb42dc540(0000) GS:ffff9e817fd80000(0000) knlGS:0000000000000000 [ 43.137983] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 43.140430] CR2: 00005608572738f0 CR3: 0000000235020000 CR4: 00000000000006e0 [ 43.143389] Call Trace: [ 43.144575] bch_cached_dev_attach+0x335/0x4f0 [bcache] [ 43.146835] __cached_dev_store+0x749/0x7e0 [bcache] [ 43.148950] ? __cached_dev_store+0x749/0x7e0 [bcache] [ 43.151144] bch_cached_dev_store+0x39/0xc0 [bcache] [ 43.153266] sysfs_kf_write+0x3c/0x50 [ 43.154892] kernfs_fop_write+0x125/0x1a0 [ 43.156682] __vfs_write+0x1b/0x40 [ 43.158211] vfs_write+0xb1/0x1a0 [ 43.159710] SyS_write+0x55/0xc0 [ 43.161167] do_syscall_64+0x73/0x130 [ 43.162772] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 43.164891] RIP: 0033:0x7f2bb3ddc154 [ 43.166471] RSP: 002b:00007fffaa0a1628 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 43.169675] RAX: ffffffffffffffda RBX: 00005608572717f0 RCX: 00007f2bb3ddc154 [ 43.172573] RDX: 0000000000000025 RSI: 00005608572717f0 RDI: 0000000000000001 [ 43.175461] RBP: 0000000000000025 R08: 000000000000f000 R09: 000056085727394d [ 43.178356] R10: 00000000000001b6 R11: 0000000000000246 R12: 0000000000000001 [ 43.180809] R13: 0000000000000025 R14: 7fffffffffffffff R15: 00007fffaa0a2f39 [ 43.182978] Code: 0a 00 00 0f 88 85 00 00 00 75 18 48 8b 35 22 8f 4d c3 48 8d 93 a0 0a 00 00 bf 00 20 00 00 e8 49 16 f2 c1 8b 83 80 0b 00 00 eb a1 <0f> 0b e9 5c ff ff ff b8 f4 ff ff ff eb 93 49 8d 8c 24 88 0a 00 [ 43.188541] ---[ end trace 6c8b3c91f79be271 ]--- [ 43.191546] bcache: bch_cached_dev_attach() Caching loop0 as bcache0 on set 0bd9f71d-b21f-4b5b-b4e0-dbb4e1126138 # reboot # # comment last line in script. # ./setup-bcache-wb_percent-before-attach.sh >/dev/null 2>&1 # [ 62.048472] bcache: register_bdev() registered backing device loop0 [ 62.081965] bcache: run_cache_set() invalidating existing data [ 62.101912] bcache: register_cache() registered cache device loop1 (wait a few seconds) [ 70.108124] BUG: unable to handle kernel NULL pointer dereference at 0000000000000340 [ 70.112057] IP: update_writeback_rate+0x36/0x2d0 [bcache] [ 70.114648] PGD 0 P4D 0 [ 70.116007] Oops: 0000 [#1] SMP PTI [ 70.117768] Modules linked in: bcache isofs nls_iso8859_1 kvm_intel kvm irqbypass joydev input_leds serio_raw sch_fq_codel ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi 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 psmouse virtio_blk virtio_net fl oppy [ 70.128731] CPU: 3 PID: 52 Comm: kworker/3:1 Not tainted 4.15.0-56-generic #62-Ubuntu [ 70.131046] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014 [ 70.133671] Workqueue: events update_writeback_rate [bcache] [ 70.135369] RIP: 0010:update_writeback_rate+0x36/0x2d0 [bcache] [ 70.137113] RSP: 0018:ffffb88440e17e48 EFLAGS: 00010202 [ 70.138792] RAX: 0000000000000018 RBX: ffff9c50b2650b08 RCX: ffff9c50bfda2160 [ 70.140988] RDX: ffff9c50bfda2160 RSI: 00000000000000c0 RDI: ffff9c50b2650b08 [ 70.143194] RBP: ffffb88440e17e78 R08: 0000000000000129 R09: 0000000000000000 [ 70.145367] R10: 0000000000000000 R11: 00000000003d0900 R12: ffff9c50b63d76c0 [ 70.147543] R13: ffff9c50bfda2140 R14: 0000000000000000 R15: 0000000000000000 [ 70.149708] FS: 0000000000000000(0000) GS:ffff9c50bfd80000(0000) knlGS:0000000000000000 [ 70.152267] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 70.154081] CR2: 0000000000000340 CR3: 0000000226e0a000 CR4: 00000000000006e0 [ 70.156247] Call Trace: [ 70.157159] process_one_work+0x1de/0x420 [ 70.158494] worker_thread+0x32/0x410 [ 70.159735] kthread+0x121/0x140 [ 70.160853] ? process_one_work+0x420/0x420 [ 70.162218] ? kthread_create_worker_on_cpu+0x70/0x70 [ 70.163839] ret_from_fork+0x35/0x40 [ 70.165036] Code: 41 56 41 55 41 54 53 48 83 ec 08 4c 8b b7 78 f5 ff ff f0 80 8f 98 f5 ff ff 10 f0 83 44 24 fc 00 48 8b 87 98 f5 ff ff a8 08 74 0b <49> 8b 86 40 03 00 00 a8 08 74 1d f0 80 a7 98 f5 ff ff ef f0 83 [ 70.170597] RIP: update_writeback_rate+0x36/0x2d0 [bcache] RSP: ffffb88440e17e48 [ 70.173842] CR2: 0000000000000340 [ 70.175672] ---[ end trace d16a2c8bfba43bf7 ]--- -- 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/1837788 Title: bcache kernel warning when attaching device Status in linux package in Ubuntu: Confirmed Bug description: See attached dmesg, each time this server is rebooted it emits a concerning bcache warning. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: linux-image-4.15.0-54-generic 4.15.0-54.58 ProcVersionSignature: Ubuntu 4.15.0-54.58-generic 4.15.18 Uname: Linux 4.15.0-54-generic x86_64 AlsaVersion: Advanced Linux Sound Architecture Driver Version k4.15.0-54-generic. AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay' ApportVersion: 2.20.9-0ubuntu7.7 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/hwC0D2', '/dev/snd/pcmC0D2c', '/dev/snd/pcmC0D3c', '/dev/snd/pcmC0D3p', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/controlC0', '/dev/snd/hwC1D0', '/dev/snd/pcmC1D3p', '/dev/snd/controlC1', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: Card0.Amixer.info: Error: [Errno 2] No such file or directory: 'amixer': 'amixer' Card0.Amixer.values: Error: [Errno 2] No such file or directory: 'amixer': 'amixer' Card1.Amixer.info: Error: [Errno 2] No such file or directory: 'amixer': 'amixer' Card1.Amixer.values: Error: [Errno 2] No such file or directory: 'amixer': 'amixer' Date: Wed Jul 24 12:28:06 2019 InstallationDate: Installed on 2013-10-04 (2119 days ago) InstallationMedia: Ubuntu-Server 13.10 "Saucy Salamander" - Beta amd64 (20130925.1) MachineType: Supermicro X9DAi ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 EFI VGA ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-54-generic root=UUID=8577302d-1f37-40a6-afcd-385beb26059f ro nomodeset elevator=deadline nvme_core.default_ps_max_latency_us=0 nopti noibrs noibpb RelatedPackageVersions: linux-restricted-modules-4.15.0-54-generic N/A linux-backports-modules-4.15.0-54-generic N/A linux-firmware 1.173.9 RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill' SourcePackage: linux UpgradeStatus: Upgraded to bionic on 2018-06-09 (409 days ago) dmi.bios.date: 05/09/2015 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 3.2 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: X9DAi dmi.board.vendor: Supermicro dmi.board.version: 0123456789 dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: Supermicro dmi.chassis.version: 0123456789 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr3.2:bd05/09/2015:svnSupermicro:pnX9DAi:pvr0123456789:rvnSupermicro:rnX9DAi:rvr0123456789:cvnSupermicro:ct3:cvr0123456789: dmi.product.family: To be filled by O.E.M. dmi.product.name: X9DAi dmi.product.version: 0123456789 dmi.sys.vendor: Supermicro To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1837788/+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
