Hi, The Fedora arm-32 build VMs have a somewhat long standing problem of hanging when running mkfs.ext4 with a bunch of processes stuck in D state. This has been seen as far back as 4.13 but is still present on 4.14: sysrq: SysRq : Show Blocked State [255/1885] task PC stack pid father auditd D 0 377 1 0x00000020 [<c0955e68>] (__schedule) from [<c0956070>] (schedule+0x98/0xbc) [<c0956070>] (schedule) from [<c09598e4>] (schedule_timeout+0x328/0x3ac) [<c09598e4>] (schedule_timeout) from [<c09564f8>] (io_schedule_timeout+0x24/0x38) [<c09564f8>] (io_schedule_timeout) from [<c03720bc>] (balance_dirty_pages.constprop.6+0xac8 /0xc5c) [<c03720bc>] (balance_dirty_pages.constprop.6) from [<c0372508>] (balance_dirty_pages_ratel imited+0x2b8/0x43c) [<c0372508>] (balance_dirty_pages_ratelimited) from [<c03637f8>] (generic_perform_write+0x1 74/0x1a4) [<c03637f8>] (generic_perform_write) from [<c0365e98>] (__generic_file_write_iter+0x16c/0x1 98) [<c0365e98>] (__generic_file_write_iter) from [<c046b398>] (ext4_file_write_iter+0x314/0x41 4) [<c046b398>] (ext4_file_write_iter) from [<c03ddd68>] (__vfs_write+0x100/0x128) [<c03ddd68>] (__vfs_write) from [<c03ddf5c>] (vfs_write+0xc0/0x194) [<c03ddf5c>] (vfs_write) from [<c03de12c>] (SyS_write+0x44/0x7c) [<c03de12c>] (SyS_write) from [<c0224ef0>] (__sys_trace_return+0x0/0x10) rs:main Q:Reg D 0 441 1 0x00000000 [<c0955e68>] (__schedule) from [<c0956070>] (schedule+0x98/0xbc) [<c0956070>] (schedule) from [<c09598e4>] (schedule_timeout+0x328/0x3ac) [<c09598e4>] (schedule_timeout) from [<c09564f8>] (io_schedule_timeout+0x24/0x38) [<c09564f8>] (io_schedule_timeout) from [<c03720bc>] (balance_dirty_pages.constprop.6+0xac8 /0xc5c) [<c03720bc>] (balance_dirty_pages.constprop.6) from [<c0372508>] (balance_dirty_pages_ratel imited+0x2b8/0x43c) [<c0372508>] (balance_dirty_pages_ratelimited) from [<c03637f8>] (generic_perform_write+0x1 74/0x1a4) [<c03637f8>] (generic_perform_write) from [<c0365e98>] (__generic_file_write_iter+0x16c/0x1 98) [<c0365e98>] (__generic_file_write_iter) from [<c046b398>] (ext4_file_write_iter+0x314/0x41 4) [<c046b398>] (ext4_file_write_iter) from [<c03ddd68>] (__vfs_write+0x100/0x128) [<c03ddd68>] (__vfs_write) from [<c03ddf5c>] (vfs_write+0xc0/0x194) [<c03ddf5c>] (vfs_write) from [<c03de12c>] (SyS_write+0x44/0x7c) [<c03de12c>] (SyS_write) from [<c0224d40>] (ret_fast_syscall+0x0/0x4c) ntpd D 0 1453 1 0x00000001 [<c0955e68>] (__schedule) from [<c0956070>] (schedule+0x98/0xbc) [<c0956070>] (schedule) from [<c09598e4>] (schedule_timeout+0x328/0x3ac) [<c09598e4>] (schedule_timeout) from [<c09564f8>] (io_schedule_timeout+0x24/0x38) [<c09564f8>] (io_schedule_timeout) from [<c03720bc>] (balance_dirty_pages.constprop.6+0xac8 /0xc5c) [<c03720bc>] (balance_dirty_pages.constprop.6) from [<c0372508>] (balance_dirty_pages_ratel imited+0x2b8/0x43c) [<c0372508>] (balance_dirty_pages_ratelimited) from [<c03637f8>] (generic_perform_write+0x1 74/0x1a4) [<c03637f8>] (generic_perform_write) from [<c0365e98>] (__generic_file_write_iter+0x16c/0x1 98) [<c0365e98>] (__generic_file_write_iter) from [<c046b398>] (ext4_file_write_iter+0x314/0x41 4) [<c046b398>] (ext4_file_write_iter) from [<c03ddd68>] (__vfs_write+0x100/0x128) [<c03ddd68>] (__vfs_write) from [<c03ddf5c>] (vfs_write+0xc0/0x194) [<c046b398>] (ext4_file_write_iter) from [<c03ddd68>] (__vfs_write+0x100/0x128) [203/1885] [<c03ddd68>] (__vfs_write) from [<c03ddf5c>] (vfs_write+0xc0/0x194) [<c03ddf5c>] (vfs_write) from [<c03de12c>] (SyS_write+0x44/0x7c) [<c03de12c>] (SyS_write) from [<c0224d40>] (ret_fast_syscall+0x0/0x4c) kojid D 0 4616 1 0x00000000 [<c0955e68>] (__schedule) from [<c0956070>] (schedule+0x98/0xbc) [<c0956070>] (schedule) from [<c09598e4>] (schedule_timeout+0x328/0x3ac) [<c09598e4>] (schedule_timeout) from [<c09564f8>] (io_schedule_timeout+0x24/0x38) [<c09564f8>] (io_schedule_timeout) from [<c03720bc>] (balance_dirty_pages.constprop.6+0xac8 /0xc5c) [<c03720bc>] (balance_dirty_pages.constprop.6) from [<c0372508>] (balance_dirty_pages_ratel imited+0x2b8/0x43c) [<c0372508>] (balance_dirty_pages_ratelimited) from [<c03637f8>] (generic_perform_write+0x1 74/0x1a4) [<c03637f8>] (generic_perform_write) from [<c0365e98>] (__generic_file_write_iter+0x16c/0x1 98) [<c0365e98>] (__generic_file_write_iter) from [<c046b398>] (ext4_file_write_iter+0x314/0x41 4) [<c046b398>] (ext4_file_write_iter) from [<c03ddd68>] (__vfs_write+0x100/0x128) [<c03ddd68>] (__vfs_write) from [<c03ddf5c>] (vfs_write+0xc0/0x194) [<c03ddf5c>] (vfs_write) from [<c03de12c>] (SyS_write+0x44/0x7c) [<c03de12c>] (SyS_write) from [<c0224d40>] (ret_fast_syscall+0x0/0x4c) kworker/u8:0 D 0 28525 2 0x00000000 Workqueue: writeback wb_workfn (flush-7:0) [<c0955e68>] (__schedule) from [<c0956070>] (schedule+0x98/0xbc) [<c0956070>] (schedule) from [<c0281c34>] (io_schedule+0x1c/0x2c) [<c0281c34>] (io_schedule) from [<c055ff2c>] (wbt_wait+0x21c/0x300) [<c055ff2c>] (wbt_wait) from [<c053ba14>] (blk_mq_make_request+0xac/0x560) [<c053ba14>] (blk_mq_make_request) from [<c0530034>] (generic_make_request+0xd0/0x214) [<c0530034>] (generic_make_request) from [<c053028c>] (submit_bio+0x114/0x16c) [<c053028c>] (submit_bio) from [<c0412b98>] (submit_bh_wbc+0x190/0x1a0) [<c0412b98>] (submit_bh_wbc) from [<c0412e90>] (__block_write_full_page+0x2e8/0x43c) [<c0412e90>] (__block_write_full_page) from [<c0413150>] (block_write_full_page+0x80/0xec) [<c0413150>] (block_write_full_page) from [<c0370380>] (__writepage+0x1c/0x4c) [<c0370380>] (__writepage) from [<c0370d30>] (write_cache_pages+0x350/0x3f0) [<c0370d30>] (write_cache_pages) from [<c03715d8>] (generic_writepages+0x44/0x60) [<c03715d8>] (generic_writepages) from [<c0372eb4>] (do_writepages+0x3c/0x74) [<c0372eb4>] (do_writepages) from [<c04098a8>] (__writeback_single_inode+0xb4/0x404) [<c04098a8>] (__writeback_single_inode) from [<c040a118>] (writeback_sb_inodes+0x258/0x438) [<c040a118>] (writeback_sb_inodes) from [<c040a364>] (__writeback_inodes_wb+0x6c/0xa8) [<c040a364>] (__writeback_inodes_wb) from [<c040a564>] (wb_writeback+0x1c4/0x30c) [<c040a564>] (wb_writeback) from [<c040ae98>] (wb_workfn+0x130/0x450) [<c040ae98>] (wb_workfn) from [<c026f488>] (process_one_work+0x254/0x42c) [<c026f488>] (process_one_work) from [<c02705c4>] (worker_thread+0x2d0/0x450) [<c02705c4>] (worker_thread) from [<c02750cc>] (kthread+0x13c/0x154) [<c02750cc>] (kthread) from [<c0224e18>] (ret_from_fork+0x14/0x3c) kworker/u8:1 D 0 16594 2 0x00000000 Workqueue: writeback wb_workfn (flush-252:0) [<c0955e68>] (__schedule) from [<c0956070>] (schedule+0x98/0xbc) [<c0956070>] (schedule) from [<c0281c34>] (io_schedule+0x1c/0x2c) [<c0281c34>] (io_schedule) from [<c055ff2c>] (wbt_wait+0x21c/0x300) [<c055ff2c>] (wbt_wait) from [<c053ba14>] (blk_mq_make_request+0xac/0x560) [<c053ba14>] (blk_mq_make_request) from [<c0530034>] (generic_make_request+0xd0/0x214) [<c0530034>] (generic_make_request) from [<c053028c>] (submit_bio+0x114/0x16c) [<c053ba14>] (blk_mq_make_request) from [<c0530034>] (generic_make_request+0xd0/0[151/1885] [<c0530034>] (generic_make_request) from [<c053028c>] (submit_bio+0x114/0x16c) [<c053028c>] (submit_bio) from [<c0412b98>] (submit_bh_wbc+0x190/0x1a0) [<c0412b98>] (submit_bh_wbc) from [<c0412e90>] (__block_write_full_page+0x2e8/0x43c) [<c0412e90>] (__block_write_full_page) from [<c0413150>] (block_write_full_page+0x80/0xec) [<c0413150>] (block_write_full_page) from [<c0370380>] (__writepage+0x1c/0x4c) [<c0370380>] (__writepage) from [<c0370d30>] (write_cache_pages+0x350/0x3f0) [<c0370d30>] (write_cache_pages) from [<c03715d8>] (generic_writepages+0x44/0x60) [<c03715d8>] (generic_writepages) from [<c0372eb4>] (do_writepages+0x3c/0x74) [<c0372eb4>] (do_writepages) from [<c04098a8>] (__writeback_single_inode+0xb4/0x404) [<c04098a8>] (__writeback_single_inode) from [<c040a118>] (writeback_sb_inodes+0x258/0x438) [<c040a118>] (writeback_sb_inodes) from [<c040a364>] (__writeback_inodes_wb+0x6c/0xa8) [<c040a364>] (__writeback_inodes_wb) from [<c040a564>] (wb_writeback+0x1c4/0x30c) [<c040a564>] (wb_writeback) from [<c040ae98>] (wb_workfn+0x130/0x450) [<c040ae98>] (wb_workfn) from [<c026f488>] (process_one_work+0x254/0x42c) [<c026f488>] (process_one_work) from [<c02705c4>] (worker_thread+0x2d0/0x450) [<c02705c4>] (worker_thread) from [<c02750cc>] (kthread+0x13c/0x154) [<c02750cc>] (kthread) from [<c0224e18>] (ret_from_fork+0x14/0x3c) loop0 D 0 9138 2 0x00000000 [<c0955e68>] (__schedule) from [<c0956070>] (schedule+0x98/0xbc) [<c0956070>] (schedule) from [<c09598e4>] (schedule_timeout+0x328/0x3ac) [<c09598e4>] (schedule_timeout) from [<c09564f8>] (io_schedule_timeout+0x24/0x38) [<c09564f8>] (io_schedule_timeout) from [<c03720bc>] (balance_dirty_pages.constprop.6+0xac8 /0xc5c) [<c03720bc>] (balance_dirty_pages.constprop.6) from [<c0372508>] (balance_dirty_pages_ratel imited+0x2b8/0x43c) [<c0372508>] (balance_dirty_pages_ratelimited) from [<c03637f8>] (generic_perform_write+0x1 74/0x1a4) [<c03637f8>] (generic_perform_write) from [<c0365e98>] (__generic_file_write_iter+0x16c/0x1 98) [<c0365e98>] (__generic_file_write_iter) from [<c046b398>] (ext4_file_write_iter+0x314/0x41 4) [<c046b398>] (ext4_file_write_iter) from [<c03dbccc>] (do_iter_readv_writev+0x118/0x140) [<c03dbccc>] (do_iter_readv_writev) from [<c03dd024>] (do_iter_write+0x84/0xf8) [<c03dd024>] (do_iter_write) from [<bf38b19c>] (lo_write_bvec+0x70/0xec [loop]) [<bf38b19c>] (lo_write_bvec [loop]) from [<bf38c04c>] (loop_queue_work+0x3b4/0x92c [loop]) [<bf38c04c>] (loop_queue_work [loop]) from [<c0275234>] (kthread_worker_fn+0x114/0x1c8) [<c0275234>] (kthread_worker_fn) from [<c02750cc>] (kthread+0x13c/0x154) [<c02750cc>] (kthread) from [<c0224e18>] (ret_from_fork+0x14/0x3c) mkfs.ext4 D 0 9142 1535 0x00000000 [<c0955e68>] (__schedule) from [<c0956070>] (schedule+0x98/0xbc) [<c0956070>] (schedule) from [<c0281c34>] (io_schedule+0x1c/0x2c) [<c0281c34>] (io_schedule) from [<c0362080>] (__lock_page+0x10c/0x144) [<c0362080>] (__lock_page) from [<c0370bb8>] (write_cache_pages+0x1d8/0x3f0) [<c0370bb8>] (write_cache_pages) from [<c03715d8>] (generic_writepages+0x44/0x60) [<c03715d8>] (generic_writepages) from [<c0372eb4>] (do_writepages+0x3c/0x74) [<c0372eb4>] (do_writepages) from [<c0364264>] (__filemap_fdatawrite_range+0xc0/0xe0) [<c0364264>] (__filemap_fdatawrite_range) from [<c0364454>] (file_write_and_wait_range+0x40 /0x78) [<c0364454>] (file_write_and_wait_range) from [<c0415868>] (blkdev_fsync+0x20/0x50) [<c0415868>] (blkdev_fsync) from [<c040e26c>] (vfs_fsync+0x28/0x30) [<c040e26c>] (vfs_fsync) from [<c040e2a4>] (do_fsync+0x30/0x4c) [<c040e2a4>] (do_fsync) from [<c0224d40>] (ret_fast_syscall+0x0/0x4c) python D 0 9167 9165 0x00000000 Sun Feb 18 18:17:58 2018] [<c0955e68>] (__schedule) from [<c0956070>] (schedule+0x98/0xbc) [<c0956070>] (schedule) from [<c09598e4>] (schedule_timeout+0x328/0x3ac) [<c09598e4>] (schedule_timeout) from [<c09564f8>] (io_schedule_timeout+0x24/0x38) [<c09564f8>] (io_schedule_timeout) from [<c03720bc>] (balance_dirty_pages.constprop.6+0xac8 /0xc5c) [<c03720bc>] (balance_dirty_pages.constprop.6) from [<c0372508>] (balance_dirty_pages_ratel imited+0x2b8/0x43c) [<c0372508>] (balance_dirty_pages_ratelimited) from [<c0397724>] (fault_dirty_shared_page+0 x9c/0xb4) [<c0397724>] (fault_dirty_shared_page) from [<c0399c48>] (do_wp_page+0x628/0x688) [<c0399c48>] (do_wp_page) from [<c039cd0c>] (handle_mm_fault+0xd5c/0xe08) [<c039cd0c>] (handle_mm_fault) from [<c095c7d8>] (do_page_fault+0x1f0/0x360) [<c095c7d8>] (do_page_fault) from [<c0201384>] (do_DataAbort+0x34/0xb4) [<c0201384>] (do_DataAbort) from [<c095c19c>] (__dabt_usr+0x3c/0x40) Exception stack(0xc69dbfb0 to 0xc69dbff8) bfa0: 019fec50 00000002 cc684d00 cc684d00 bfc0: 00000001 b4214cf4 019fec50 00000002 000587b8 00000000 00000001 b4214cf0 bfe0: b4f39584 bec32990 b4eee238 b4e799a0 600f0010 ffffffff python D 0 9313 9304 0x00000000 [<c0955e68>] (__schedule) from [<c0956070>] (schedule+0x98/0xbc) [<c0956070>] (schedule) from [<c09598e4>] (schedule_timeout+0x328/0x3ac) [<c09598e4>] (schedule_timeout) from [<c09564f8>] (io_schedule_timeout+0x24/0x38) [<c09564f8>] (io_schedule_timeout) from [<c03720bc>] (balance_dirty_pages.constprop.6+0xac8 /0xc5c) [<c03720bc>] (balance_dirty_pages.constprop.6) from [<c0372508>] (balance_dirty_pages_ratel imited+0x2b8/0x43c) [<c0372508>] (balance_dirty_pages_ratelimited) from [<c03637f8>] (generic_perform_write+0x1 74/0x1a4) [<c03637f8>] (generic_perform_write) from [<c0365e98>] (__generic_file_write_iter+0x16c/0x1 98) [<c0365e98>] (__generic_file_write_iter) from [<c046b398>] (ext4_file_write_iter+0x314/0x41 4) [<c046b398>] (ext4_file_write_iter) from [<c03ddd68>] (__vfs_write+0x100/0x128) [<c03ddd68>] (__vfs_write) from [<c03ddf5c>] (vfs_write+0xc0/0x194) [<c03ddf5c>] (vfs_write) from [<c03de12c>] (SyS_write+0x44/0x7c) [<c03de12c>] (SyS_write) from [<c0224d40>] (ret_fast_syscall+0x0/0x4c) python D 0 9326 9317 0x00000000 [<c0955e68>] (__schedule) from [<c0956070>] (schedule+0x98/0xbc) [<c0956070>] (schedule) from [<c09598e4>] (schedule_timeout+0x328/0x3ac) [<c09598e4>] (schedule_timeout) from [<c09564f8>] (io_schedule_timeout+0x24/0x38) [<c09564f8>] (io_schedule_timeout) from [<c03720bc>] (balance_dirty_pages.constprop.6+0xac8 /0xc5c) [<c03720bc>] (balance_dirty_pages.constprop.6) from [<c0372508>] (balance_dirty_pages_ratel imited+0x2b8/0x43c) [<c0372508>] (balance_dirty_pages_ratelimited) from [<c03637f8>] (generic_perform_write+0x1 74/0x1a4) [<c03637f8>] (generic_perform_write) from [<c0365e98>] (__generic_file_write_iter+0x16c/0x1 98) [<c0365e98>] (__generic_file_write_iter) from [<c046b398>] (ext4_file_write_iter+0x314/0x41 4) [<c046b398>] (ext4_file_write_iter) from [<c03ddd68>] (__vfs_write+0x100/0x128) [<c03ddd68>] (__vfs_write) from [<c03ddf5c>] (vfs_write+0xc0/0x194) [<c03ddf5c>] (vfs_write) from [<c03de12c>] (SyS_write+0x44/0x7c) [<c03de12c>] (SyS_write) from [<c0224d40>] (ret_fast_syscall+0x0/0x4c) python D 0 9351 9342 0x00000000 [<c0955e68>] (__schedule) from [<c0956070>] (schedule+0x98/0xbc) [<c0956070>] (schedule) from [<c09598e4>] (schedule_timeout+0x328/0x3ac) [<c09598e4>] (schedule_timeout) from [<c09564f8>] (io_schedule_timeout+0x24/0x38) [<c09564f8>] (io_schedule_timeout) from [<c03720bc>] (balance_dirty_pages.constprop.6+0xac8 /0xc5c) [<c03720bc>] (balance_dirty_pages.constprop.6) from [<c0372508>] (balance_dirty_pages_ratel imited+0x2b8/0x43c) [<c0372508>] (balance_dirty_pages_ratelimited) from [<c03637f8>] (generic_perform_write+0x1 74/0x1a4) [<c03637f8>] (generic_perform_write) from [<c0365e98>] (__generic_file_write_iter+0x16c/0x1 98) [<c0365e98>] (__generic_file_write_iter) from [<c046b398>] (ext4_file_write_iter+0x314/0x41 4) [<c046b398>] (ext4_file_write_iter) from [<c03ddd68>] (__vfs_write+0x100/0x128) [<c03ddd68>] (__vfs_write) from [<c03ddf5c>] (vfs_write+0xc0/0x194) [<c03ddf5c>] (vfs_write) from [<c03de12c>] (SyS_write+0x44/0x7c) [<c03de12c>] (SyS_write) from [<c0224d40>] (ret_fast_syscall+0x0/0x4c) python D 0 9361 9352 0x00000000 [<c0955e68>] (__schedule) from [<c0956070>] (schedule+0x98/0xbc) [<c0956070>] (schedule) from [<c09598e4>] (schedule_timeout+0x328/0x3ac) [<c09598e4>] (schedule_timeout) from [<c09564f8>] (io_schedule_timeout+0x24/0x38) [<c09564f8>] (io_schedule_timeout) from [<c03720bc>] (balance_dirty_pages.constprop.6+0xac8 /0xc5c) [<c03720bc>] (balance_dirty_pages.constprop.6) from [<c0372508>] (balance_dirty_pages_ratel imited+0x2b8/0x43c) [<c0372508>] (balance_dirty_pages_ratelimited) from [<c03637f8>] (generic_perform_write+0x1 74/0x1a4) [<c03637f8>] (generic_perform_write) from [<c0365e98>] (__generic_file_write_iter+0x16c/0x1 98) [<c0365e98>] (__generic_file_write_iter) from [<c046b398>] (ext4_file_write_iter+0x314/0x41 4) [<c046b398>] (ext4_file_write_iter) from [<c03ddd68>] (__vfs_write+0x100/0x128) [<c03ddd68>] (__vfs_write) from [<c03ddf5c>] (vfs_write+0xc0/0x194) [<c03ddf5c>] (vfs_write) from [<c03de12c>] (SyS_write+0x44/0x7c) [<c03de12c>] (SyS_write) from [<c0224d40>] (ret_fast_syscall+0x0/0x4c) python D 0 9374 9365 0x00000000 [<c0955e68>] (__schedule) from [<c0956070>] (schedule+0x98/0xbc) [<c0956070>] (schedule) from [<c09598e4>] (schedule_timeout+0x328/0x3ac) [<c09598e4>] (schedule_timeout) from [<c09564f8>] (io_schedule_timeout+0x24/0x38) [<c09564f8>] (io_schedule_timeout) from [<c03720bc>] (balance_dirty_pages.constprop.6+0xac8 /0xc5c) [<c03720bc>] (balance_dirty_pages.constprop.6) from [<c0372508>] (balance_dirty_pages_ratel imited+0x2b8/0x43c) [<c0372508>] (balance_dirty_pages_ratelimited) from [<c03637f8>] (generic_perform_write+0x1 74/0x1a4) [<c03637f8>] (generic_perform_write) from [<c0365e98>] (__generic_file_write_iter+0x16c/0x1 98) [<c0365e98>] (__generic_file_write_iter) from [<c046b398>] (ext4_file_write_iter+0x314/0x41 4) [<c046b398>] (ext4_file_write_iter) from [<c03ddd68>] (__vfs_write+0x100/0x128) [<c03ddd68>] (__vfs_write) from [<c03ddf5c>] (vfs_write+0xc0/0x194) [<c03ddf5c>] (vfs_write) from [<c03de12c>] (SyS_write+0x44/0x7c) [<c03de12c>] (SyS_write) from [<c0224d40>] (ret_fast_syscall+0x0/0x4c) python D 0 9385 9376 0x00000000 [<c0955e68>] (__schedule) from [<c0956070>] (schedule+0x98/0xbc) [<c0956070>] (schedule) from [<c09598e4>] (schedule_timeout+0x328/0x3ac) [<c09598e4>] (schedule_timeout) from [<c09564f8>] (io_schedule_timeout+0x24/0x38) [<c09564f8>] (io_schedule_timeout) from [<c03720bc>] (balance_dirty_pages.constprop.6+0xac8 /0xc5c) [<c03720bc>] (balance_dirty_pages.constprop.6) from [<c0372508>] (balance_dirty_pages_ratel imited+0x2b8/0x43c) [<c0372508>] (balance_dirty_pages_ratelimited) from [<c03637f8>] (generic_perform_write+0x1 74/0x1a4) [<c03637f8>] (generic_perform_write) from [<c0365e98>] (__generic_file_write_iter+0x16c/0x1 98) [<c0365e98>] (__generic_file_write_iter) from [<c046b398>] (ext4_file_write_iter+0x314/0x41 4) [<c046b398>] (ext4_file_write_iter) from [<c03ddd68>] (__vfs_write+0x100/0x128) [<c03ddd68>] (__vfs_write) from [<c03ddf5c>] (vfs_write+0xc0/0x194) [<c03ddf5c>] (vfs_write) from [<c03de12c>] (SyS_write+0x44/0x7c) [<c03de12c>] (SyS_write) from [<c0224d40>] (ret_fast_syscall+0x0/0x4c) systemd-journal D 0 9678 1 0x00000080 [<c0955e68>] (__schedule) from [<c0956070>] (schedule+0x98/0xbc) [<c0956070>] (schedule) from [<c09598e4>] (schedule_timeout+0x328/0x3ac) [<c09598e4>] (schedule_timeout) from [<c09564f8>] (io_schedule_timeout+0x24/0x38) [<c09564f8>] (io_schedule_timeout) from [<c03720bc>] (balance_dirty_pages.constprop.6+0xac8 /0xc5c) [<c03720bc>] (balance_dirty_pages.constprop.6) from [<c0372508>] (balance_dirty_pages_ratel imited+0x2b8/0x43c) [<c0372508>] (balance_dirty_pages_ratelimited) from [<c0397724>] (fault_dirty_shared_page+0 x9c/0xb4) [<c0397724>] (fault_dirty_shared_page) from [<c039cc34>] (handle_mm_fault+0xc84/0xe08) [<c039cc34>] (handle_mm_fault) from [<c095c7d8>] (do_page_fault+0x1f0/0x360) [<c095c7d8>] (do_page_fault) from [<c0201384>] (do_DataAbort+0x34/0xb4) [<c0201384>] (do_DataAbort) from [<c095c19c>] (__dabt_usr+0x3c/0x40) Exception stack(0xc40d9fb0 to 0xc40d9ff8) 9fa0: b5e605e0 00000000 001c2b28 b5e64000 9fc0: 01b60ff0 00000000 be94e444 be94e448 001c6550 00000000 be94e660 be94e450 9fe0: 00000000 be94e400 b6cfffcc b6e94a50 20000010 ffffffff This looks like everything is blocked on the writeback completing but the writeback has been throttled. According to the infra team, this problem is _not_ seen without LPAE (i.e. only 4G of RAM). I did see https://patchwork.kernel.org/patch/10201593/ but that doesn't seem to quite match since this seems to be completely stuck. Any suggestions to narrow the problem down? Thanks, Laura -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
