Public bug reported:
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.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug bionic third-party-packages
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https://bugs.launchpad.net/bugs/1891773
Title:
kcompactd0 and btrfs-transaction keep deadlocking with each other
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