I have same problem on two computers One old i5-2500 running Ubuntu 18.04 - 4.15.0-115-generic with btrfs mounted on /home One new Ryzen 9 3900X (was) running 18.04 - 4.15.117-generic with btrfs on / and /home New one I upgraded yesterday to 20.04 and it is now on 5.4.0-47-generic. I hope issue is gone since this machine is important. Both are running also VMs. New one is running Virtualbox VMs and Old one is running one KVM VM. On the old one I still have 112 and 66 kernel versions. But prior to 115 I didn't use KVM on this computer. Not sure if virtualization is also trigger for the issue.
-- 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/1891773 Title: kcompactd0 and btrfs-transaction keep deadlocking with each other Status in linux package in Ubuntu: Confirmed Bug description: Example 1: [346911.187920] INFO: task kcompactd0:53 blocked for more than 120 seconds. [346911.187938] Not tainted 4.15.0-112-generic #113-Ubuntu [346911.187951] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [346911.187968] kcompactd0 D 0 53 2 0x80000000 [346911.187969] Call Trace: [346911.187973] __schedule+0x24e/0x880 [346911.187986] ? btree_releasepage+0x42/0x50 [btrfs] [346911.187987] schedule+0x2c/0x80 [346911.187988] io_schedule+0x16/0x40 [346911.187989] __lock_page+0xff/0x140 [346911.187990] ? page_cache_tree_insert+0xe0/0xe0 [346911.187992] migrate_pages+0x91f/0xb80 [346911.187993] ? __ClearPageMovable+0x10/0x10 [346911.187994] ? isolate_freepages_block+0x3b0/0x3b0 [346911.187995] compact_zone+0x681/0x950 [346911.187995] kcompactd_do_work+0xfe/0x2a0 [346911.187996] ? __switch_to_asm+0x35/0x70 [346911.187997] ? __switch_to_asm+0x41/0x70 [346911.187998] kcompactd+0x86/0x1c0 [346911.187999] ? kcompactd+0x86/0x1c0 [346911.188001] ? wait_woken+0x80/0x80 [346911.188002] kthread+0x121/0x140 [346911.188003] ? kcompactd_do_work+0x2a0/0x2a0 [346911.188003] ? kthread_create_worker_on_cpu+0x70/0x70 [346911.188004] ret_from_fork+0x35/0x40 [346911.188015] INFO: task btrfs-transacti:858 blocked for more than 120 seconds. [346911.188031] Not tainted 4.15.0-112-generic #113-Ubuntu [346911.188043] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [346911.188060] btrfs-transacti D 0 858 2 0x80000000 [346911.188061] Call Trace: [346911.188062] __schedule+0x24e/0x880 [346911.188063] ? bit_wait+0x60/0x60 [346911.188063] schedule+0x2c/0x80 [346911.188064] io_schedule+0x16/0x40 [346911.188065] bit_wait_io+0x11/0x60 [346911.188066] __wait_on_bit+0x4c/0x90 [346911.188066] ? bit_wait+0x60/0x60 [346911.188067] out_of_line_wait_on_bit+0x90/0xb0 [346911.188068] ? bit_waitqueue+0x40/0x40 [346911.188080] lock_extent_buffer_for_io+0x100/0x2a0 [btrfs] [346911.188090] btree_write_cache_pages+0x1b8/0x420 [btrfs] [346911.188092] ? native_sched_clock_from_tsc+0x30/0x70 [346911.188092] ? update_load_avg+0x423/0x780 [346911.188101] btree_writepages+0x5d/0x70 [btrfs] [346911.188102] do_writepages+0x4b/0xe0 [346911.188102] ? enqueue_task_fair+0xb6/0x300 [346911.188111] ? merge_state.part.47+0x44/0x130 [btrfs] [346911.188112] __filemap_fdatawrite_range+0xcf/0x100 [346911.188113] ? __filemap_fdatawrite_range+0xcf/0x100 [346911.188114] filemap_fdatawrite_range+0x13/0x20 [346911.188122] btrfs_write_marked_extents+0x68/0x140 [btrfs] [346911.188129] btrfs_write_and_wait_marked_extents.constprop.20+0x4f/0x90 [btrfs] [346911.188136] btrfs_commit_transaction+0x696/0x910 [btrfs] [346911.188143] ? btrfs_commit_transaction+0x696/0x910 [btrfs] [346911.188144] ? wait_woken+0x80/0x80 [346911.188151] transaction_kthread+0x18d/0x1b0 [btrfs] [346911.188152] kthread+0x121/0x140 [346911.188158] ? btrfs_cleanup_transaction+0x570/0x570 [btrfs] [346911.188159] ? kthread_create_worker_on_cpu+0x70/0x70 [346911.188160] ret_from_fork+0x35/0x40 Example 2: 2020-08-11T20:23:03.533+01:00 <err> kernel: INFO: task kcompactd0:53 blocked for more than 120 seconds. 2020-08-11T20:23:03.533+01:00 <err> kernel: Not tainted 4.15.0-112-generic #113-Ubuntu 2020-08-11T20:23:03.533+01:00 <err> kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. 2020-08-11T20:23:03.533+01:00 <info> kernel: kcompactd0 D 0 53 2 0x80000000 2020-08-11T20:23:03.533+01:00 <warning> kernel: Call Trace: 2020-08-11T20:23:03.533+01:00 <warning> kernel: __schedule+0x24e/0x880 2020-08-11T20:23:03.533+01:00 <warning> kernel: ? btree_releasepage+0x42/0x50 [btrfs] 2020-08-11T20:23:03.533+01:00 <warning> kernel: schedule+0x2c/0x80 2020-08-11T20:23:03.533+01:00 <warning> kernel: io_schedule+0x16/0x40 2020-08-11T20:23:03.533+01:00 <warning> kernel: __lock_page+0xff/0x140 2020-08-11T20:23:03.533+01:00 <warning> kernel: ? page_cache_tree_insert+0xe0/0xe0 2020-08-11T20:23:03.533+01:00 <warning> kernel: migrate_pages+0x91f/0xb80 2020-08-11T20:23:03.533+01:00 <warning> kernel: ? __ClearPageMovable+0x10/0x10 2020-08-11T20:23:03.533+01:00 <warning> kernel: ? isolate_freepages_block+0x3b0/0x3b0 2020-08-11T20:23:03.533+01:00 <warning> kernel: compact_zone+0x681/0x950 2020-08-11T20:23:03.533+01:00 <warning> kernel: kcompactd_do_work+0xfe/0x2a0 2020-08-11T20:23:03.533+01:00 <warning> kernel: ? __switch_to_asm+0x35/0x70 2020-08-11T20:23:03.533+01:00 <warning> kernel: ? __switch_to_asm+0x41/0x70 2020-08-11T20:23:03.533+01:00 <warning> kernel: ? __switch_to_asm+0x35/0x70 2020-08-11T20:23:03.533+01:00 <warning> kernel: kcompactd+0x86/0x1c0 2020-08-11T20:23:03.533+01:00 <warning> kernel: ? kcompactd+0x86/0x1c0 2020-08-11T20:23:03.533+01:00 <warning> kernel: ? wait_woken+0x80/0x80 2020-08-11T20:23:03.533+01:00 <warning> kernel: kthread+0x121/0x140 2020-08-11T20:23:03.533+01:00 <warning> kernel: ? kcompactd_do_work+0x2a0/0x2a0 2020-08-11T20:23:03.534+01:00 <warning> kernel: ? kthread_create_worker_on_cpu+0x70/0x70 2020-08-11T20:23:03.534+01:00 <warning> kernel: ret_from_fork+0x35/0x40 2020-08-11T20:23:03.534+01:00 <err> kernel: INFO: task btrfs-transacti:864 blocked for more than 120 seconds. 2020-08-11T20:23:03.534+01:00 <err> kernel: Not tainted 4.15.0-112-generic #113-Ubuntu 2020-08-11T20:23:03.534+01:00 <err> kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. 2020-08-11T20:23:03.534+01:00 <info> kernel: btrfs-transacti D 0 864 2 0x80000000 2020-08-11T20:23:03.534+01:00 <warning> kernel: Call Trace: 2020-08-11T20:23:03.534+01:00 <warning> kernel: __schedule+0x24e/0x880 2020-08-11T20:23:03.534+01:00 <warning> kernel: ? bit_wait+0x60/0x60 2020-08-11T20:23:03.534+01:00 <warning> kernel: schedule+0x2c/0x80 2020-08-11T20:23:03.534+01:00 <warning> kernel: io_schedule+0x16/0x40 2020-08-11T20:23:03.534+01:00 <warning> kernel: bit_wait_io+0x11/0x60 2020-08-11T20:23:03.534+01:00 <warning> kernel: __wait_on_bit+0x4c/0x90 2020-08-11T20:23:03.534+01:00 <warning> kernel: ? bit_wait+0x60/0x60 2020-08-11T20:23:03.534+01:00 <warning> kernel: out_of_line_wait_on_bit+0x90/0xb0 2020-08-11T20:23:03.534+01:00 <warning> kernel: ? bit_waitqueue+0x40/0x40 2020-08-11T20:23:03.534+01:00 <warning> kernel: lock_extent_buffer_for_io+0x100/0x2a0 [btrfs] 2020-08-11T20:23:03.534+01:00 <warning> kernel: btree_write_cache_pages+0x1b8/0x420 [btrfs] 2020-08-11T20:23:03.534+01:00 <warning> kernel: btree_writepages+0x5d/0x70 [btrfs] 2020-08-11T20:23:03.534+01:00 <warning> kernel: do_writepages+0x4b/0xe0 2020-08-11T20:23:03.534+01:00 <warning> kernel: ? enqueue_task_fair+0xb6/0x300 2020-08-11T20:23:03.534+01:00 <warning> kernel: ? merge_state.part.47+0x44/0x130 [btrfs] 2020-08-11T20:23:03.534+01:00 <warning> kernel: __filemap_fdatawrite_range+0xcf/0x100 2020-08-11T20:23:03.534+01:00 <warning> kernel: ? __filemap_fdatawrite_range+0xcf/0x100 2020-08-11T20:23:03.534+01:00 <warning> kernel: filemap_fdatawrite_range+0x13/0x20 2020-08-11T20:23:03.534+01:00 <warning> kernel: btrfs_write_marked_extents+0x68/0x140 [btrfs] 2020-08-11T20:23:03.534+01:00 <warning> kernel: btrfs_write_and_wait_marked_extents.constprop.20+0x4f/0x90 [btrfs] 2020-08-11T20:23:03.534+01:00 <warning> kernel: btrfs_commit_transaction+0x696/0x910 [btrfs] 2020-08-11T20:23:03.534+01:00 <warning> kernel: ? btrfs_commit_transaction+0x696/0x910 [btrfs] 2020-08-11T20:23:03.534+01:00 <warning> kernel: ? start_transaction+0x191/0x430 [btrfs] 2020-08-11T20:23:03.534+01:00 <warning> kernel: transaction_kthread+0x18d/0x1b0 [btrfs] 2020-08-11T20:23:03.534+01:00 <warning> kernel: kthread+0x121/0x140 2020-08-11T20:23:03.534+01:00 <warning> kernel: ? btrfs_cleanup_transaction+0x570/0x570 [btrfs] 2020-08-11T20:23:03.534+01:00 <warning> kernel: ? kthread_create_worker_on_cpu+0x70/0x70 2020-08-11T20:23:03.534+01:00 <warning> kernel: ret_from_fork+0x35/0x40 2020-08-11T20:23:03.534+01:00 <err> kernel: INFO: task snapperd:5196 blocked for more than 120 seconds. 2020-08-11T20:23:03.534+01:00 <err> kernel: Not tainted 4.15.0-112-generic #113-Ubuntu 2020-08-11T20:23:03.534+01:00 <err> kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. 2020-08-11T20:23:03.534+01:00 <info> kernel: snapperd D 0 5196 1 0x00000000 2020-08-11T20:23:03.534+01:00 <warning> kernel: Call Trace: 2020-08-11T20:23:03.534+01:00 <warning> kernel: __schedule+0x24e/0x880 2020-08-11T20:23:03.534+01:00 <warning> kernel: schedule+0x2c/0x80 2020-08-11T20:23:03.534+01:00 <warning> kernel: wait_for_commit+0x46/0x90 [btrfs] 2020-08-11T20:23:03.534+01:00 <warning> kernel: ? wait_woken+0x80/0x80 2020-08-11T20:23:03.534+01:00 <warning> kernel: btrfs_commit_transaction+0x287/0x910 [btrfs] 2020-08-11T20:23:03.534+01:00 <warning> kernel: ? start_transaction+0x191/0x430 [btrfs] 2020-08-11T20:23:03.534+01:00 <warning> kernel: btrfs_mksubvol+0x592/0x5a0 [btrfs] 2020-08-11T20:23:03.534+01:00 <warning> kernel: btrfs_ioctl_snap_create_transid+0x18c/0x1a0 [btrfs] 2020-08-11T20:23:03.534+01:00 <warning> kernel: btrfs_ioctl_snap_create_v2+0x11e/0x180 [btrfs] 2020-08-11T20:23:03.534+01:00 <warning> kernel: btrfs_ioctl+0x84f/0x2490 [btrfs] 2020-08-11T20:23:03.534+01:00 <warning> kernel: ? do_filp_open+0xaf/0x110 2020-08-11T20:23:03.534+01:00 <warning> kernel: ? _copy_to_user+0x26/0x30 2020-08-11T20:23:03.534+01:00 <warning> kernel: ? cp_new_stat+0x152/0x180 2020-08-11T20:23:03.534+01:00 <warning> kernel: do_vfs_ioctl+0xa8/0x630 2020-08-11T20:23:03.534+01:00 <warning> kernel: ? btrfs_ioctl_get_supported_features+0x30/0x30 [btrfs] 2020-08-11T20:23:03.534+01:00 <warning> kernel: ? do_vfs_ioctl+0xa8/0x630 2020-08-11T20:23:03.534+01:00 <warning> kernel: ? __fput+0x193/0x220 2020-08-11T20:23:03.534+01:00 <warning> kernel: SyS_ioctl+0x79/0x90 2020-08-11T20:23:03.534+01:00 <warning> kernel: do_syscall_64+0x73/0x130 2020-08-11T20:23:03.534+01:00 <warning> kernel: entry_SYSCALL_64_after_hwframe+0x41/0xa6 2020-08-11T20:23:03.534+01:00 <warning> kernel: RIP: 0033:0x7f6dec22d6d7 2020-08-11T20:23:03.534+01:00 <warning> kernel: RSP: 002b:00007f6de6c782c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 2020-08-11T20:23:03.534+01:00 <warning> kernel: RAX: ffffffffffffffda RBX: 00007f6de6c782d0 RCX: 00007f6dec22d6d7 2020-08-11T20:23:03.534+01:00 <warning> kernel: RDX: 00007f6de6c782d0 RSI: 0000000050009417 RDI: 0000000000000007 2020-08-11T20:23:03.534+01:00 <warning> kernel: RBP: 0000000000000006 R08: 000000000000000f R09: 00007f6de6c79f83 2020-08-11T20:23:03.534+01:00 <warning> kernel: R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000007 2020-08-11T20:23:03.534+01:00 <warning> kernel: R13: 00007f6de6c7a450 R14: 0000000000000000 R15: 0000000000000001 ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: linux-image-generic 4.15.0.112.100 ProcVersionSignature: Ubuntu 4.15.0-112.113-generic 4.15.18 Uname: Linux 4.15.0-112-generic x86_64 AlsaVersion: Advanced Linux Sound Architecture Driver Version k4.15.0-112-generic. AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay' ApportVersion: 2.20.9-0ubuntu7.16 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/hwC0D2', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D10p', '/dev/snd/pcmC0D9p', '/dev/snd/pcmC0D8p', '/dev/snd/pcmC0D7p', '/dev/snd/pcmC0D3p', '/dev/snd/pcmC0D2c', '/dev/snd/pcmC0D0c', '/dev/snd/by-path', '/dev/snd/pcmC0D0p', '/dev/snd/controlC0', '/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' Date: Sat Aug 15 22:39:32 2020 InstallationDate: Installed on 2012-02-01 (3117 days ago) InstallationMedia: Ubuntu-Server 11.10 "Oneiric Ocelot" - Release amd64 (20111011) Lsusb: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 002: ID 05e3:0608 Genesys Logic, Inc. Hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: Gigabyte Technology Co., Ltd. Q370M D3H GSM PLUS ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-4.15.0-112-generic root=/dev/mapper/lvm_loko0-root ro rootflags=subvol=@ sysrq_always_enabled panic=60 RelatedPackageVersions: linux-restricted-modules-4.15.0-112-generic N/A linux-backports-modules-4.15.0-112-generic N/A linux-firmware 1.173.19 RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill' SourcePackage: linux UpgradeStatus: Upgraded to bionic on 2020-08-07 (8 days ago) dmi.bios.date: 05/11/2020 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: F15c C2 dmi.board.asset.tag: Default string dmi.board.name: Q370M D3H GSM PLUS dmi.board.vendor: Gigabyte Technology Co., Ltd. dmi.board.version: x.x dmi.chassis.asset.tag: Default string dmi.chassis.type: 3 dmi.chassis.vendor: Default string dmi.chassis.version: Default string dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF15cC2:bd05/11/2020:svnGigabyteTechnologyCo.,Ltd.:pnQ370MD3HGSMPLUS:pvrDefaultstring:rvnGigabyteTechnologyCo.,Ltd.:rnQ370MD3HGSMPLUS:rvrx.x:cvnDefaultstring:ct3:cvrDefaultstring: dmi.product.family: Default string dmi.product.name: Q370M D3H GSM PLUS dmi.product.version: Default string dmi.sys.vendor: Gigabyte Technology Co., Ltd. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1891773/+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
