Reproduced on ubuntu_zfs_stress
- openstack arm64-vm jammy:linux generic-64k 5.15.0-198-generic-64k

================================= STACK 
===============================================
[ 2977.471233] ZFS options:   recordsize=4096
[ 2977.471279] Stress test:   
/home/ubuntu/autotest/client/tmp/ubuntu_zfs_stress/src/stress-ng/stress-ng 
--verify --times --metrics-brief --syslog --keep-name -t 5s --hdd 4 --hdd-opts 
sync,wr-rnd,rd-rnd,fadv-willneed,fadv-rnd --link 4 --symlink 4 --lockf 4 --seek 
4 --aio 4 --aio-requests 32 --dentry 4 --dir 4 --dentry-order stride 
--fallocate 4 --fstat 4 --dentries 65536 --io 1 --lease 4 --mmap 0 --mmap-file 
--mmap-async --open 4 --rename 4 --hdd-bytes 128M --fallocate-bytes 128M 
--chdir 4 --chmod 4 --filename 4 --rename 4 --mmap-bytes 128M --hdd-write-size 
512 --ionice-class besteffort --ionice-level 0
[ 2977.471302] Mount point:   /testpool/test
[ 3142.546399] INFO: task kswapd0:91 blocked for more than 120 seconds.
[ 3142.547173]       Tainted: P           O      5.15.0-198-generic-64k 
#208-Ubuntu
[ 3142.547853] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this 
message.
[ 3142.548557] task:kswapd0         state:D stack:    0 pid:   91 ppid:     2 
flags:0x00000008
[ 3142.548562] Call trace:
[ 3142.548562]  __switch_to+0xf8/0x140
[ 3142.548617]  __schedule+0x298/0x750
[ 3142.548621]  schedule+0x64/0x140
[ 3142.548623]  cv_wait_common+0x1c8/0x1d0 [spl]
[ 3142.548637]  __cv_wait+0x20/0x30 [spl]
[ 3142.548647]  dmu_tx_wait+0x124/0x1e0 [zfs]
[ 3142.548746]  zfs_putpage+0x454/0x460 [zfs]
[ 3142.548855]  zpl_putpage+0x48/0x70 [zfs]
[ 3142.548944]  zpl_writepage+0x40/0x50 [zfs]
[ 3142.549032]  pageout+0x104/0x3ac
[ 3142.549035]  shrink_page_list+0xb4c/0xf70
[ 3142.549036]  shrink_inactive_list+0x170/0x550
[ 3142.549038]  shrink_lruvec+0x2d0/0x3c0
[ 3142.549039]  shrink_node_memcgs+0x1c4/0x22c
[ 3142.549040]  shrink_node+0x164/0x6f0
[ 3142.549042]  balance_pgdat+0x34c/0x80c
[ 3142.549043]  kswapd+0x130/0x220
[ 3142.549045]  kthread+0x110/0x114
[ 3142.549048]  ret_from_fork+0x10/0x20
[ 3142.549061] INFO: task kworker/u4:4:44237 blocked for more than 120 seconds.
[ 3142.549717]       Tainted: P           O      5.15.0-198-generic-64k 
#208-Ubuntu
[ 3142.550420] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this 
message.
[ 3142.551270] task:kworker/u4:4    state:D stack:    0 pid:44237 ppid:     2 
flags:0x00000008
[ 3142.551276] Workqueue: writeback wb_workfn (flush-zfs-62)
[ 3142.551281] Call trace:
[ 3142.551282]  __switch_to+0xf8/0x140
[ 3142.551285]  __schedule+0x298/0x750
[ 3142.551288]  schedule+0x64/0x140
[ 3142.551291]  cv_wait_common+0x1c8/0x1d0 [spl]
[ 3142.551304]  __cv_wait+0x20/0x30 [spl]
[ 3142.551313]  dmu_tx_wait+0x124/0x1e0 [zfs]
[ 3142.551404]  zfs_putpage+0x454/0x460 [zfs]
[ 3142.551492]  zpl_putpage+0x48/0x70 [zfs]
[ 3142.551579]  write_cache_pages+0x1b4/0x420
[ 3142.551582]  zpl_writepages+0x9c/0x190 [zfs]
[ 3142.551669]  do_writepages+0x88/0x264
[ 3142.551671]  __writeback_single_inode+0x48/0x3d0
[ 3142.551673]  writeback_sb_inodes+0x260/0x660
[ 3142.551675]  __writeback_inodes_wb+0x68/0x170
[ 3142.551676]  wb_writeback+0x314/0x410
[ 3142.551678]  wb_do_writeback+0x2f4/0x3c0
[ 3142.551679]  wb_workfn+0x94/0x2cc
[ 3142.551680]  process_one_work+0x210/0x4f0
[ 3142.551683]  worker_thread+0x170/0x5a0
[ 3142.551685]  kthread+0x110/0x114
[ 3142.551687]  ret_from_fork+0x10/0x20
[ 3142.551697] INFO: task txg_quiesce:178211 blocked for more than 120 seconds.
[ 3142.552452]       Tainted: P           O      5.15.0-198-generic-64k 
#208-Ubuntu
[ 3142.553239] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this 
message.
[ 3142.554009] task:txg_quiesce     state:D stack:    0 pid:178211 ppid:     2 
flags:0x00000008
[ 3142.554014] Call trace:
[ 3142.554015]  __switch_to+0xf8/0x140
[ 3142.554019]  __schedule+0x298/0x750
[ 3142.554022]  schedule+0x64/0x140
[ 3142.554025]  cv_wait_common+0x1c8/0x1d0 [spl]
[ 3142.554037]  __cv_wait+0x20/0x30 [spl]
[ 3142.554046]  txg_quiesce+0x17c/0x1f4 [zfs]
[ 3142.554138]  txg_quiesce_thread+0xb8/0x12c [zfs]
[ 3142.554225]  thread_generic_wrapper+0x68/0x80 [spl]
[ 3142.554235]  kthread+0x110/0x114
[ 3142.554238]  ret_from_fork+0x10/0x20
[ 3142.554242] INFO: task stress-ng:178577 blocked for more than 120 seconds.
[ 3142.555235]       Tainted: P           O      5.15.0-198-generic-64k 
#208-Ubuntu
[ 3142.556103] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this 
message.
[ 3142.556934] task:stress-ng       state:D stack:    0 pid:178577 ppid:178523 
flags:0x00000005
[ 3142.556938] Call trace:
[ 3142.556939]  __switch_to+0xf8/0x140
[ 3142.556943]  __schedule+0x298/0x750
[ 3142.556946]  schedule+0x64/0x140
[ 3142.556948]  io_schedule+0x44/0x64
[ 3142.556951]  cv_wait_common+0xdc/0x1d0 [spl]
[ 3142.556963]  __cv_wait_io+0x20/0x30 [spl]
[ 3142.556972]  txg_wait_open+0xa4/0x100 [zfs]
[ 3142.557063]  dmu_free_long_range_impl+0x2c8/0x380 [zfs]
[ 3142.557149]  dmu_free_long_range+0xa8/0xe0 [zfs]
[ 3142.557235]  zfs_rmnode+0x2c4/0x3ac [zfs]
[ 3142.557324]  zfs_zinactive+0xf4/0x100 [zfs]
[ 3142.557411]  zfs_inactive+0x134/0x200 [zfs]
[ 3142.557499]  zpl_evict_inode+0x48/0x70 [zfs]
[ 3142.557585]  evict+0x124/0x380
[ 3142.557589]  iput_final+0x90/0x1c0
[ 3142.557590]  iput+0xf4/0x114
[ 3142.557591]  dentry_unlink_inode+0xd0/0x15c
[ 3142.557593]  __dentry_kill+0xe4/0x220
[ 3142.557595]  dput+0x3a0/0x44c
[ 3142.557597]  __fput+0xd4/0x284
[ 3142.557600]  ____fput+0x18/0x24
[ 3142.557602]  task_work_run+0xc8/0x170
[ 3142.557605]  do_notify_resume+0x1e8/0x20c
[ 3142.557606]  el0_svc+0x6c/0x160
[ 3142.557608]  el0t_64_sync_handler+0xa4/0x12c
[ 3142.557610]  el0t_64_sync+0x1a4/0x1a8
[ 3142.557613] INFO: task stress-ng:178580 blocked for more than 120 seconds.
[ 3142.558380]       Tainted: P           O      5.15.0-198-generic-64k 
#208-Ubuntu
[ 3142.559201] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this 
message.
[ 3142.559969] task:stress-ng       state:D stack:    0 pid:178580 ppid:178523 
flags:0x00000005
[ 3142.559973] Call trace:
[ 3142.559974]  __switch_to+0xf8/0x140
[ 3142.559977]  __schedule+0x298/0x750
[ 3142.559981]  schedule+0x64/0x140
[ 3142.559983]  io_schedule+0x44/0x64
[ 3142.559985]  cv_wait_common+0xdc/0x1d0 [spl]
[ 3142.559997]  __cv_wait_io+0x20/0x30 [spl]
[ 3142.560007]  txg_wait_open+0xa4/0x100 [zfs]
[ 3142.560097]  dmu_free_long_range_impl+0x2c8/0x380 [zfs]
[ 3142.560183]  dmu_free_long_range+0xa8/0xe0 [zfs]
[ 3142.560268]  zfs_rmnode+0x2c4/0x3ac [zfs]
[ 3142.560354]  zfs_zinactive+0xf4/0x100 [zfs]
[ 3142.560440]  zfs_inactive+0x134/0x200 [zfs]
[ 3142.560526]  zpl_evict_inode+0x48/0x70 [zfs]
[ 3142.560611]  evict+0x124/0x380
[ 3142.560615]  iput_final+0x90/0x1c0
[ 3142.560616]  iput+0xf4/0x114
[ 3142.560617]  dentry_unlink_inode+0xd0/0x15c
[ 3142.560619]  __dentry_kill+0xe4/0x220
[ 3142.560621]  dput+0x3a0/0x44c
[ 3142.560623]  __fput+0xd4/0x284
[ 3142.560625]  ____fput+0x18/0x24
[ 3142.560627]  task_work_run+0xc8/0x170
[ 3142.560629]  do_notify_resume+0x1e8/0x20c
[ 3142.560631]  el0_svc+0x6c/0x160
[ 3142.560633]  el0t_64_sync_handler+0xa4/0x12c
[ 3142.560634]  el0t_64_sync+0x1a4/0x1a8
[ 3142.560638] INFO: task stress-ng:178593 blocked for more than 120 seconds.
[ 3142.561484]       Tainted: P           O      5.15.0-198-generic-64k 
#208-Ubuntu
[ 3142.562221] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this 
message.
[ 3142.563043] task:stress-ng       state:D stack:    0 pid:178593 ppid:178523 
flags:0x0000000d
[ 3142.563047] Call trace:
[ 3142.563048]  __switch_to+0xf8/0x140
[ 3142.563052]  __schedule+0x298/0x750
[ 3142.563055]  schedule+0x64/0x140
[ 3142.563057]  io_schedule+0x44/0x64
[ 3142.563059]  cv_wait_common+0xdc/0x1d0 [spl]
[ 3142.563072]  __cv_wait_io+0x20/0x30 [spl]
[ 3142.563081]  txg_wait_open+0xa4/0x100 [zfs]
[ 3142.563172]  dmu_free_long_range_impl+0x2c8/0x380 [zfs]
[ 3142.563257]  dmu_free_long_range+0xa8/0xe0 [zfs]
[ 3142.563342]  zfs_rmnode+0x2c4/0x3ac [zfs]
[ 3142.563429]  zfs_zinactive+0xf4/0x100 [zfs]
[ 3142.563516]  zfs_inactive+0x134/0x200 [zfs]
[ 3142.563602]  zpl_evict_inode+0x48/0x70 [zfs]
[ 3142.563688]  evict+0x124/0x380
[ 3142.563691]  iput_final+0x90/0x1c0
[ 3142.563692]  iput+0xf4/0x114
[ 3142.563693]  do_unlinkat+0x1e4/0x29c
[ 3142.563695]  __arm64_sys_unlinkat+0x48/0x90
[ 3142.563696]  invoke_syscall+0x68/0xe0
[ 3142.563699]  el0_svc_common.constprop.0+0x54/0x184
[ 3142.563702]  do_el0_svc+0x30/0xac
[ 3142.563704]  el0_svc+0x48/0x160
[ 3142.563705]  el0t_64_sync_handler+0xa4/0x12c
[ 3142.563707]  el0t_64_sync+0x1a4/0x1a8
[ 3142.563709] INFO: task stress-ng:178594 blocked for more than 120 seconds.
[ 3142.564409]       Tainted: P           O      5.15.0-198-generic-64k 
#208-Ubuntu
[ 3142.565132] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this 
message.
[ 3142.565885] task:stress-ng       state:D stack:    0 pid:178594 ppid:178523 
flags:0x00000005
[ 3142.565889] Call trace:
[ 3142.565890]  __switch_to+0xf8/0x140
[ 3142.565893]  __schedule+0x298/0x750
[ 3142.565896]  schedule+0x64/0x140
[ 3142.565898]  io_schedule+0x44/0x64
[ 3142.565900]  cv_wait_common+0xdc/0x1d0 [spl]
[ 3142.565913]  __cv_wait_io+0x20/0x30 [spl]
[ 3142.565922]  txg_wait_open+0xa4/0x100 [zfs]
[ 3142.566013]  dmu_free_long_range_impl+0x2c8/0x380 [zfs]
[ 3142.566099]  dmu_free_long_range+0xa8/0xe0 [zfs]
[ 3142.566184]  zfs_rmnode+0x2c4/0x3ac [zfs]
[ 3142.566271]  zfs_zinactive+0xf4/0x100 [zfs]
[ 3142.566388]  zfs_inactive+0x134/0x200 [zfs]
[ 3142.566475]  zpl_evict_inode+0x48/0x70 [zfs]
[ 3142.566560]  evict+0x124/0x380
[ 3142.566564]  iput_final+0x90/0x1c0
[ 3142.566565]  iput+0xf4/0x114
[ 3142.566566]  do_unlinkat+0x1e4/0x29c
[ 3142.566568]  __arm64_sys_unlinkat+0x48/0x90
[ 3142.566569]  invoke_syscall+0x68/0xe0
[ 3142.566572]  el0_svc_common.constprop.0+0x54/0x184
[ 3142.566574]  do_el0_svc+0x30/0xac
[ 3142.566576]  el0_svc+0x48/0x160
[ 3142.566578]  el0t_64_sync_handler+0xa4/0x12c
[ 3142.566580]  el0t_64_sync+0x1a4/0x1a8
[ 3142.566582] INFO: task stress-ng:178595 blocked for more than 120 seconds.
[ 3142.567255]       Tainted: P           O      5.15.0-198-generic-64k 
#208-Ubuntu
[ 3142.567992] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this 
message.
[ 3142.568698] task:stress-ng       state:D stack:    0 pid:178595 ppid:178523 
flags:0x00000005
[ 3142.568703] Call trace:
[ 3142.568703]  __switch_to+0xf8/0x140
[ 3142.568707]  __schedule+0x298/0x750
[ 3142.568710]  schedule+0x64/0x140
[ 3142.568712]  io_schedule+0x44/0x64
[ 3142.568714]  cv_wait_common+0xdc/0x1d0 [spl]
[ 3142.568726]  __cv_wait_io+0x20/0x30 [spl]
[ 3142.568735]  txg_wait_open+0xa4/0x100 [zfs]
[ 3142.568838]  dmu_free_long_range_impl+0x2c8/0x380 [zfs]
[ 3142.568924]  dmu_free_long_range+0xa8/0xe0 [zfs]
[ 3142.569009]  zfs_rmnode+0x2c4/0x3ac [zfs]
[ 3142.569097]  zfs_zinactive+0xf4/0x100 [zfs]
[ 3142.569183]  zfs_inactive+0x134/0x200 [zfs]
[ 3142.569269]  zpl_evict_inode+0x48/0x70 [zfs]
[ 3142.569354]  evict+0x124/0x380
[ 3142.569357]  iput_final+0x90/0x1c0
[ 3142.569358]  iput+0xf4/0x114
[ 3142.569359]  do_unlinkat+0x1e4/0x29c
[ 3142.569361]  __arm64_sys_unlinkat+0x48/0x90
[ 3142.569362]  invoke_syscall+0x68/0xe0
[ 3142.569365]  el0_svc_common.constprop.0+0x54/0x184
[ 3142.569367]  do_el0_svc+0x30/0xac
[ 3142.569369]  el0_svc+0x48/0x160
[ 3142.569370]  el0t_64_sync_handler+0xa4/0x12c
[ 3142.569372]  el0t_64_sync+0x1a4/0x1a8
[ 3142.569374] INFO: task stress-ng:178596 blocked for more than 120 seconds.
[ 3142.570068]       Tainted: P           O      5.15.0-198-generic-64k 
#208-Ubuntu
[ 3142.570847] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this 
message.
[ 3142.571593] task:stress-ng       state:D stack:    0 pid:178596 ppid:178523 
flags:0x0000000d
[ 3142.571598] Call trace:
[ 3142.571599]  __switch_to+0xf8/0x140
[ 3142.571602]  __schedule+0x298/0x750
[ 3142.571605]  schedule+0x64/0x140
[ 3142.571607]  io_schedule+0x44/0x64
[ 3142.571609]  cv_wait_common+0xdc/0x1d0 [spl]
[ 3142.571621]  __cv_wait_io+0x20/0x30 [spl]
[ 3142.571630]  txg_wait_open+0xa4/0x100 [zfs]
[ 3142.571718]  dmu_free_long_range_impl+0x2c8/0x380 [zfs]
[ 3142.571817]  dmu_free_long_range+0xa8/0xe0 [zfs]
[ 3142.571901]  zfs_rmnode+0x2c4/0x3ac [zfs]
[ 3142.571989]  zfs_zinactive+0xf4/0x100 [zfs]
[ 3142.572075]  zfs_inactive+0x134/0x200 [zfs]
[ 3142.572160]  zpl_evict_inode+0x48/0x70 [zfs]
[ 3142.572245]  evict+0x124/0x380
[ 3142.572249]  iput_final+0x90/0x1c0
[ 3142.572250]  iput+0xf4/0x114
[ 3142.572251]  do_unlinkat+0x1e4/0x29c
[ 3142.572253]  __arm64_sys_unlinkat+0x48/0x90
[ 3142.572254]  invoke_syscall+0x68/0xe0
[ 3142.572257]  el0_svc_common.constprop.0+0x54/0x184
[ 3142.572259]  do_el0_svc+0x30/0xac
[ 3142.572261]  el0_svc+0x48/0x160
[ 3142.572263]  el0t_64_sync_handler+0xa4/0x12c
[ 3142.572264]  el0t_64_sync+0x1a4/0x1a8
[ 3142.572267] INFO: task stress-ng:178635 blocked for more than 120 seconds.
[ 3142.572963]       Tainted: P           O      5.15.0-198-generic-64k 
#208-Ubuntu
[ 3142.573640] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this 
message.
[ 3142.574430] task:stress-ng       state:D stack:    0 pid:178635 ppid:     1 
flags:0x00000005
[ 3142.574435] Call trace:
[ 3142.574435]  __switch_to+0xf8/0x140
[ 3142.574438]  __schedule+0x298/0x750
[ 3142.574441]  schedule+0x64/0x140
[ 3142.574443]  io_schedule+0x44/0x64
[ 3142.574445]  cv_wait_common+0xdc/0x1d0 [spl]
[ 3142.574458]  __cv_wait_io+0x20/0x30 [spl]
[ 3142.574467]  txg_wait_synced_impl+0xa8/0x140 [zfs]
[ 3142.574556]  txg_wait_synced+0x1c/0x60 [zfs]
[ 3142.574643]  dmu_tx_wait+0x17c/0x1e0 [zfs]
[ 3142.574729]  dmu_tx_assign+0x50/0x90 [zfs]
[ 3142.574832]  zfs_write+0x30c/0xaf0 [zfs]
[ 3142.574919]  zpl_iter_write+0xf0/0x130 [zfs]
[ 3142.575005]  new_sync_write+0xf4/0x194
[ 3142.575008]  vfs_write+0x238/0x2d0
[ 3142.575010]  ksys_write+0x74/0x10c
[ 3142.575012]  __arm64_sys_write+0x24/0x30
[ 3142.575014]  invoke_syscall+0x68/0xe0
[ 3142.575016]  el0_svc_common.constprop.0+0x54/0x184
[ 3142.575019]  do_el0_svc+0x30/0xac
[ 3142.575021]  el0_svc+0x48/0x160
[ 3142.575023]  el0t_64_sync_handler+0xa4/0x12c
[ 3142.575024]  el0t_64_sync+0x1a4/0x1a8
==========================================================================================

=========================== Test suite command 
===========================================
09:40:31 DEBUG| [stdout] ZFS options:   recordsize=4096
09:40:31 DEBUG| [stdout] Stress test:   
/home/ubuntu/autotest/client/tmp/ubuntu_zfs_stress/src/stress-ng/stress-ng 
--verify --times --metrics-brief --syslog --keep-name -t 5s --hdd 4 --hdd-opts 
sync,wr-rnd,rd-rnd,fadv-willneed,fadv-rnd --link 4 --symlink 4 --lockf 4 --seek 
4 --aio 4 --aio-requests 32 --dentry 4 --dir 4 --dentry-order stride 
--fallocate 4 --fstat 4 --dentries 65536 --io 1 --lease 4 --mmap 0 --mmap-file 
--mmap-async --open 4 --rename 4 --hdd-bytes 128M --fallocate-bytes 128M 
--chdir 4 --chmod 4 --filename 4 --rename 4 --mmap-bytes 128M --hdd-write-size 
512 --ionice-class besteffort --ionice-level 0
09:40:31 DEBUG| [stdout] VDEV path:     
09:40:31 DEBUG| [stdout] Mount point:   /testpool/test
09:40:31 DEBUG| [stdout] Date:          Fri Oct 9 09:40:31 UTC 2026
09:40:31 DEBUG| [stdout] Host:          afaina-jammy-test-3-kcp
09:40:31 DEBUG| [stdout] Kernel:        5.15.0-198-generic-64k #208-Ubuntu SMP 
Fri Sep 4 11:25:05 UTC 2026
09:40:31 DEBUG| [stdout] Machine:       afaina-jammy-test-3-kcp aarch64
09:40:31 DEBUG| [stdout] CPUs online:   2
09:40:31 DEBUG| [stdout] CPUs total:    2
09:40:31 DEBUG| [stdout] Page size:     65536
09:40:31 DEBUG| [stdout] Pages avail:   49549
09:40:31 DEBUG| [stdout] Pages total:   63598
09:40:31 DEBUG| [stdout] 
--------------------------------------------------------------------------------
09:40:31 DEBUG| [stdout]  
09:40:31 DEBUG| [stdout] zfs set recordsize=4096 testpool/test
09:40:31 DEBUG| [stdout]  
09:40:31 DEBUG| [stdout] stress-ng: info:  [178523] aio stressor will be 
skipped, it is not implemented on this system: aarch64 Linux 
5.15.0-198-generic-64k gcc 11.4.0 (built without aio.h)
09:40:31 DEBUG| [stdout] stress-ng: info:  [178523] setting to a 5 secs run per 
stressor
09:40:31 DEBUG| [stdout] stress-ng: info:  [178523] dispatching hogs: 4 hdd, 4 
link, 4 symlink, 4 lockf, 4 seek, 4 dentry, 4 dir, 4 fallocate, 4 fstat, 1 io, 
4 lease, 2 mmap, 4 open, 4 rename, 4 chdir, 4 chmod, 4 filename, 4 rename
09:40:31 DEBUG| [stdout] stress-ng: info:  [178523] note: 
/proc/sys/kernel/sched_autogroup_enabled is 1 and this can impact scheduling 
throughput for processes not attached to a tty. Setting this to 0 may improve 
performance metrics
09:40:31 DEBUG| [stdout] stress-ng: info:  [178533] hdd: using 256M file system 
space per stressor instance (total 1G of 1.75G available file system space)
09:40:31 DEBUG| [stdout] stress-ng: info:  [178561] fallocate: using 32M file 
system space per stressor instance (total 128M of 1.75G available file system 
space)
09:40:31 DEBUG| [stdout] stress-ng: info:  [178569] io: this is a legacy I/O 
sync stressor, consider using iomix instead
09:40:31 DEBUG| [stdout] stress-ng: info:  [178575] mmap: using 128M per 
stressor instance (total 256M of 2.98G available memory)
09:40:31 DEBUG| [stdout] stress-ng: info:  [178577] open: using a maximum of 
1048576 file descriptors
09:40:36 DEBUG| [stdout] stress-ng: info:  [178553] dentry: 12195 dentries 
allocated
09:40:36 DEBUG| [stdout] stress-ng: info:  [178585] chdir: removing 8192 
directories
09:42:36 DEBUG| [stdout] stress-ng: warn:  [178576] cannot terminate process 
178635, gave up after 120 seconds
09:42:36 DEBUG| [stdout] stress-ng: warn:  [178575] cannot terminate process 
178637, gave up after 120 seconds
==========================================================================================

** Also affects: linux (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Also affects: zfs-linux (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Focal)
     Assignee: (unassigned) => Canonical Kernel Team (canonical-kernel-team)

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https://bugs.launchpad.net/bugs/2158722

Title:
  ubuntu_zfs_stress failure for jammy on openstack:ppc64el

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