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Message-ID: <55c8b839-e844-49fe-bedc-948e60f681c7@gmx.com> Date: Mon, 23 Jun 2025 15:20:43 +0930 From: Qu Wenruo <quwenruo.btrfs@....com> To: Byungchul Park <byungchul@...com>, linux-kernel@...r.kernel.org, clm@...com, josef@...icpanda.com, dsterba@...e.com, linux-btrfs@...r.kernel.org Cc: kernel_team@...ynix.com, torvalds@...ux-foundation.org, akpm@...ux-foundation.org, yeoreum.yun@....com, yunseong.kim@...csson.com, gwan-gyeong.mun@...el.com, harry.yoo@...cle.com, ysk@...lloc.com Subject: Re: [RFC] DEPT report on around btrfs, unlink, and truncate 在 2025/6/23 12:51, Byungchul Park 写道: > Hi folks, > > Thanks to Yunseong, we got two DEPT reports in btrfs. It doesn't mean > it's obvious deadlocks, but after digging into the reports, I'm > wondering if it could happen by any chance. > > 1) The first scenario that I'm concerning is: > > context A context B > > do_truncate() > ... > btrfs_do_readpage() // with folio lock held This one is for data.> do_unlinkat() > ... > push_leaf_right() > btrfs_tree_lock_nested() > down_write_nested(&eb->lock) // hold > btrfs_get_extent() > btrfs_lookup_file_extent() > btrfs_search_slot() > down_read_nested(&eb->lock) // stuck This one is for metadata. Data and metadata page cache will never cross into each other. Thanks, Qu > __push_leaf_right() > ... > folio_lock() // stuck > > 2) The second scenario that I'm concerning is: > > context A context B > > do_truncate() > ... > btrfs_do_readpage() // with folio lock held > do_unlinkat() > ... > btrfs_truncate_inode_items() > btrfs_lock_root_node() > down_write_nested(&eb->lock) // hold > btrfs_del_items() > push_leaf_right() > __push_leaf_right() > btrfs_get_extent() > btrfs_lookup_file_extent() > btrfs_search_slot() > btrfs_read_lock_root_node() > down_read_nested(&eb->lock) // stuck > ... > folio_lock() //stuck > > Am I missing something? > > FYI, the followings are the DEPT reports we got. > > Byungchul > > --- > [ 304.343395][ T7488] =================================================== > [ 304.343446][ T7488] DEPT: Circular dependency has been detected. > [ 304.343462][ T7488] 6.15.0-rc6-00043-ga83a69ec7f9f #5 Not tainted > [ 304.343477][ T7488] --------------------------------------------------- > [ 304.343488][ T7488] summary > [ 304.343498][ T7488] --------------------------------------------------- > [ 304.343509][ T7488] *** DEADLOCK *** > [ 304.343509][ T7488] > [ 304.343520][ T7488] context A > [ 304.343531][ T7488] [S] lock(btrfs-tree-00:0) > [ 304.343545][ T7488] [W] dept_page_wait_on_bit(pg_locked_map:0) > [ 304.343559][ T7488] [E] unlock(btrfs-tree-00:0) > [ 304.343572][ T7488] > [ 304.343581][ T7488] context B > [ 304.343591][ T7488] [S] (unknown)(pg_locked_map:0) > [ 304.343603][ T7488] [W] lock(btrfs-tree-00:0) > [ 304.343616][ T7488] [E] dept_page_clear_bit(pg_locked_map:0) > [ 304.343629][ T7488] > [ 304.343637][ T7488] [S]: start of the event context > [ 304.343647][ T7488] [W]: the wait blocked > [ 304.343656][ T7488] [E]: the event not reachable > [ 304.343666][ T7488] --------------------------------------------------- > [ 304.343676][ T7488] context A's detail > [ 304.343686][ T7488] --------------------------------------------------- > [ 304.343696][ T7488] context A > [ 304.343706][ T7488] [S] lock(btrfs-tree-00:0) > [ 304.343718][ T7488] [W] dept_page_wait_on_bit(pg_locked_map:0) > [ 304.343731][ T7488] [E] unlock(btrfs-tree-00:0) > [ 304.343744][ T7488] > [ 304.343753][ T7488] [S] lock(btrfs-tree-00:0): > [ 304.343764][ T7488] [<ffff8000824f41d8>] btrfs_tree_lock_nested+0x38/0x324 > [ 304.343796][ T7488] stacktrace: > [ 304.343805][ T7488] down_write_nested+0xe4/0x21c > [ 304.343826][ T7488] btrfs_tree_lock_nested+0x38/0x324 > [ 304.343865][ T7488] push_leaf_right+0x23c/0x628 > [ 304.343896][ T7488] btrfs_del_items+0x974/0xaec > [ 304.343916][ T7488] btrfs_truncate_inode_items+0x1c5c/0x2b00 > [ 304.343938][ T7488] btrfs_evict_inode+0xa4c/0xd38 > [ 304.343968][ T7488] evict+0x340/0x7b0 > [ 304.343993][ T7488] iput+0x4ec/0x840 > [ 304.344011][ T7488] do_unlinkat+0x444/0x59c > [ 304.344038][ T7488] __arm64_sys_unlinkat+0x11c/0x260 > [ 304.344057][ T7488] invoke_syscall+0x88/0x2e0 > [ 304.344084][ T7488] el0_svc_common.constprop.0+0xe8/0x2e0 > [ 304.344104][ T7488] do_el0_svc+0x44/0x60 > [ 304.344123][ T7488] el0_svc+0x50/0x188 > [ 304.344151][ T7488] el0t_64_sync_handler+0x10c/0x140 > [ 304.344172][ T7488] el0t_64_sync+0x198/0x19c > [ 304.344189][ T7488] > [ 304.344198][ T7488] [W] dept_page_wait_on_bit(pg_locked_map:0): > [ 304.344211][ T7488] [<ffff8000823b1d20>] __push_leaf_right+0x8f0/0xc70 > [ 304.344232][ T7488] stacktrace: > [ 304.344241][ T7488] __push_leaf_right+0x8f0/0xc70 > [ 304.344260][ T7488] push_leaf_right+0x408/0x628 > [ 304.344278][ T7488] btrfs_del_items+0x974/0xaec > [ 304.344297][ T7488] btrfs_truncate_inode_items+0x1c5c/0x2b00 > [ 304.344314][ T7488] btrfs_evict_inode+0xa4c/0xd38 > [ 304.344335][ T7488] evict+0x340/0x7b0 > [ 304.344352][ T7488] iput+0x4ec/0x840 > [ 304.344369][ T7488] do_unlinkat+0x444/0x59c > [ 304.344388][ T7488] __arm64_sys_unlinkat+0x11c/0x260 > [ 304.344407][ T7488] invoke_syscall+0x88/0x2e0 > [ 304.344425][ T7488] el0_svc_common.constprop.0+0xe8/0x2e0 > [ 304.344445][ T7488] do_el0_svc+0x44/0x60 > [ 304.344463][ T7488] el0_svc+0x50/0x188 > [ 304.344482][ T7488] el0t_64_sync_handler+0x10c/0x140 > [ 304.344503][ T7488] el0t_64_sync+0x198/0x19c > [ 304.344518][ T7488] > [ 304.344527][ T7488] [E] unlock(btrfs-tree-00:0): > [ 304.344539][ T7488] (N/A) > [ 304.344549][ T7488] --------------------------------------------------- > [ 304.344559][ T7488] context B's detail > [ 304.344568][ T7488] --------------------------------------------------- > [ 304.344578][ T7488] context B > [ 304.344588][ T7488] [S] (unknown)(pg_locked_map:0) > [ 304.344600][ T7488] [W] lock(btrfs-tree-00:0) > [ 304.344613][ T7488] [E] dept_page_clear_bit(pg_locked_map:0) > [ 304.344625][ T7488] > [ 304.344634][ T7488] [S] (unknown)(pg_locked_map:0): > [ 304.344646][ T7488] (N/A) > [ 304.344655][ T7488] > [ 304.344663][ T7488] [W] lock(btrfs-tree-00:0): > [ 304.344675][ T7488] [<ffff8000824f3b48>] btrfs_tree_read_lock_nested+0x38/0x330 > [ 304.344694][ T7488] stacktrace: > [ 304.344703][ T7488] down_read_nested+0xc8/0x368 > [ 304.344720][ T7488] btrfs_tree_read_lock_nested+0x38/0x330 > [ 304.344737][ T7488] btrfs_search_slot+0x1204/0x2dc8 > [ 304.344756][ T7488] btrfs_lookup_file_extent+0xe0/0x128 > [ 304.344773][ T7488] btrfs_get_extent+0x2cc/0x1e24 > [ 304.344789][ T7488] btrfs_do_readpage+0x628/0x1258 > [ 304.344810][ T7488] btrfs_read_folio+0x310/0x450 > [ 304.344828][ T7488] btrfs_truncate_block+0x2c0/0xb24 > [ 304.344854][ T7488] btrfs_cont_expand+0x11c/0xba8 > [ 304.344870][ T7488] btrfs_setattr+0x8d8/0x10f4 > [ 304.344885][ T7488] notify_change+0x900/0xfbc > [ 304.344906][ T7488] do_truncate+0x154/0x210 > [ 304.344937][ T7488] vfs_truncate+0x55c/0x66c > [ 304.344957][ T7488] __arm64_sys_truncate+0x16c/0x1e4 > [ 304.344978][ T7488] invoke_syscall+0x88/0x2e0 > [ 304.344997][ T7488] el0_svc_common.constprop.0+0xe8/0x2e0 > [ 304.345017][ T7488] > [ 304.345025][ T7488] [E] dept_page_clear_bit(pg_locked_map:0): > [ 304.345037][ T7488] [<ffff80008249c284>] end_folio_read+0x3e4/0x590 > [ 304.345056][ T7488] stacktrace: > [ 304.345065][ T7488] folio_unlock+0x8c/0x160 > [ 304.345099][ T7488] end_folio_read+0x3e4/0x590 > [ 304.345116][ T7488] btrfs_do_readpage+0x830/0x1258 > [ 304.345132][ T7488] btrfs_read_folio+0x310/0x450 > [ 304.345149][ T7488] btrfs_truncate_block+0x2c0/0xb24 > [ 304.345164][ T7488] btrfs_cont_expand+0x11c/0xba8 > [ 304.345179][ T7488] btrfs_setattr+0x8d8/0x10f4 > [ 304.345194][ T7488] notify_change+0x900/0xfbc > [ 304.345213][ T7488] do_truncate+0x154/0x210 > [ 304.345232][ T7488] vfs_truncate+0x55c/0x66c > [ 304.345252][ T7488] __arm64_sys_truncate+0x16c/0x1e4 > [ 304.345272][ T7488] invoke_syscall+0x88/0x2e0 > [ 304.345291][ T7488] el0_svc_common.constprop.0+0xe8/0x2e0 > [ 304.345310][ T7488] do_el0_svc+0x44/0x60 > [ 304.345328][ T7488] el0_svc+0x50/0x188 > [ 304.345347][ T7488] el0t_64_sync_handler+0x10c/0x140 > [ 304.345369][ T7488] --------------------------------------------------- > [ 304.345379][ T7488] information that might be helpful > [ 304.345388][ T7488] --------------------------------------------------- > [ 304.345402][ T7488] CPU: 1 UID: 0 PID: 7488 Comm: syz-executor Not tainted 6.15.0-rc6-00043-ga83a69ec7f9f #5 PREEMPT > [ 304.345416][ T7488] Hardware name: QEMU KVM Virtual Machine, BIOS 2025.02-8 05/13/2025 > [ 304.345422][ T7488] Call trace: > [ 304.345426][ T7488] show_stack+0x34/0x80 (C) > [ 304.345452][ T7488] dump_stack_lvl+0x104/0x180 > [ 304.345476][ T7488] dump_stack+0x20/0x2c > [ 304.345490][ T7488] cb_check_dl+0x1080/0x10ec > [ 304.345504][ T7488] bfs+0x4d8/0x630 > [ 304.345514][ T7488] add_dep+0x1cc/0x364 > [ 304.345526][ T7488] __dept_wait+0x60c/0x16e0 > [ 304.345537][ T7488] dept_wait+0x168/0x1a8 > [ 304.345548][ T7488] btrfs_clear_buffer_dirty+0x420/0x820 > [ 304.345561][ T7488] __push_leaf_right+0x8f0/0xc70 > [ 304.345575][ T7488] push_leaf_right+0x408/0x628 > [ 304.345589][ T7488] btrfs_del_items+0x974/0xaec > [ 304.345603][ T7488] btrfs_truncate_inode_items+0x1c5c/0x2b00 > [ 304.345616][ T7488] btrfs_evict_inode+0xa4c/0xd38 > [ 304.345632][ T7488] evict+0x340/0x7b0 > [ 304.345644][ T7488] iput+0x4ec/0x840 > [ 304.345657][ T7488] do_unlinkat+0x444/0x59c > [ 304.345671][ T7488] __arm64_sys_unlinkat+0x11c/0x260 > [ 304.345685][ T7488] invoke_syscall+0x88/0x2e0 > [ 304.345698][ T7488] el0_svc_common.constprop.0+0xe8/0x2e0 > [ 304.345713][ T7488] do_el0_svc+0x44/0x60 > [ 304.345726][ T7488] el0_svc+0x50/0x188 > [ 304.345741][ T7488] el0t_64_sync_handler+0x10c/0x140 > [ 304.345756][ T7488] el0t_64_sync+0x198/0x19c > [ 304.345857][ T7488] =================================================== > [ 304.345995][ T7488] DEPT: Circular dependency has been detected. > [ 304.346006][ T7488] 6.15.0-rc6-00043-ga83a69ec7f9f #5 Not tainted > [ 304.346019][ T7488] --------------------------------------------------- > [ 304.346029][ T7488] summary > [ 304.346038][ T7488] --------------------------------------------------- > [ 304.346049][ T7488] *** DEADLOCK *** > [ 304.346049][ T7488] > [ 304.346058][ T7488] context A > [ 304.346069][ T7488] [S] lock(btrfs-tree-01:0) > [ 304.346082][ T7488] [W] dept_page_wait_on_bit(pg_locked_map:0) > [ 304.346095][ T7488] [E] unlock(btrfs-tree-01:0) > [ 304.346108][ T7488] > [ 304.346117][ T7488] context B > [ 304.346126][ T7488] [S] (unknown)(pg_locked_map:0) > [ 304.346139][ T7488] [W] lock(btrfs-tree-01:0) > [ 304.346151][ T7488] [E] dept_page_clear_bit(pg_locked_map:0) > [ 304.346164][ T7488] > [ 304.346173][ T7488] [S]: start of the event context > [ 304.346183][ T7488] [W]: the wait blocked > [ 304.346192][ T7488] [E]: the event not reachable > [ 304.346201][ T7488] --------------------------------------------------- > [ 304.346211][ T7488] context A's detail > [ 304.346221][ T7488] --------------------------------------------------- > [ 304.346231][ T7488] context A > [ 304.346240][ T7488] [S] lock(btrfs-tree-01:0) > [ 304.346253][ T7488] [W] dept_page_wait_on_bit(pg_locked_map:0) > [ 304.346266][ T7488] [E] unlock(btrfs-tree-01:0) > [ 304.346278][ T7488] > [ 304.346287][ T7488] [S] lock(btrfs-tree-01:0): > [ 304.346299][ T7488] [<ffff8000824f41d8>] btrfs_tree_lock_nested+0x38/0x324 > [ 304.346321][ T7488] stacktrace: > [ 304.346330][ T7488] down_write_nested+0xe4/0x21c > [ 304.346347][ T7488] btrfs_tree_lock_nested+0x38/0x324 > [ 304.346363][ T7488] btrfs_lock_root_node+0x70/0xac > [ 304.346379][ T7488] btrfs_search_slot+0x3f8/0x2dc8 > [ 304.346399][ T7488] btrfs_truncate_inode_items+0x2ec/0x2b00 > [ 304.346417][ T7488] btrfs_evict_inode+0xa4c/0xd38 > [ 304.346438][ T7488] evict+0x340/0x7b0 > [ 304.346456][ T7488] iput+0x4ec/0x840 > [ 304.346473][ T7488] do_unlinkat+0x444/0x59c > [ 304.346492][ T7488] __arm64_sys_unlinkat+0x11c/0x260 > [ 304.346511][ T7488] invoke_syscall+0x88/0x2e0 > [ 304.346530][ T7488] el0_svc_common.constprop.0+0xe8/0x2e0 > [ 304.346550][ T7488] do_el0_svc+0x44/0x60 > [ 304.346568][ T7488] el0_svc+0x50/0x188 > [ 304.346588][ T7488] el0t_64_sync_handler+0x10c/0x140 > [ 304.346608][ T7488] el0t_64_sync+0x198/0x19c > [ 304.346623][ T7488] > [ 304.346632][ T7488] [W] dept_page_wait_on_bit(pg_locked_map:0): > [ 304.346644][ T7488] [<ffff8000823b1d20>] __push_leaf_right+0x8f0/0xc70 > [ 304.346665][ T7488] stacktrace: > [ 304.346674][ T7488] __push_leaf_right+0x8f0/0xc70 > [ 304.346692][ T7488] push_leaf_right+0x408/0x628 > [ 304.346711][ T7488] btrfs_del_items+0x974/0xaec > [ 304.346729][ T7488] btrfs_truncate_inode_items+0x1c5c/0x2b00 > [ 304.346747][ T7488] btrfs_evict_inode+0xa4c/0xd38 > [ 304.346767][ T7488] evict+0x340/0x7b0 > [ 304.346785][ T7488] iput+0x4ec/0x840 > [ 304.346802][ T7488] do_unlinkat+0x444/0x59c > [ 304.346820][ T7488] __arm64_sys_unlinkat+0x11c/0x260 > [ 304.346850][ T7488] invoke_syscall+0x88/0x2e0 > [ 304.346871][ T7488] el0_svc_common.constprop.0+0xe8/0x2e0 > [ 304.346891][ T7488] do_el0_svc+0x44/0x60 > [ 304.346909][ T7488] el0_svc+0x50/0x188 > [ 304.346928][ T7488] el0t_64_sync_handler+0x10c/0x140 > [ 304.346949][ T7488] el0t_64_sync+0x198/0x19c > [ 304.346963][ T7488] > [ 304.346972][ T7488] [E] unlock(btrfs-tree-01:0): > [ 304.346984][ T7488] (N/A) > [ 304.346994][ T7488] --------------------------------------------------- > [ 304.347004][ T7488] context B's detail > [ 304.347013][ T7488] --------------------------------------------------- > [ 304.347023][ T7488] context B > [ 304.347033][ T7488] [S] (unknown)(pg_locked_map:0) > [ 304.347046][ T7488] [W] lock(btrfs-tree-01:0) > [ 304.347058][ T7488] [E] dept_page_clear_bit(pg_locked_map:0) > [ 304.347071][ T7488] > [ 304.347080][ T7488] [S] (unknown)(pg_locked_map:0): > [ 304.347092][ T7488] (N/A) > [ 304.347101][ T7488] > [ 304.347109][ T7488] [W] lock(btrfs-tree-01:0): > [ 304.347121][ T7488] [<ffff8000824f3b48>] btrfs_tree_read_lock_nested+0x38/0x330 > [ 304.347140][ T7488] stacktrace: > [ 304.347149][ T7488] down_read_nested+0xc8/0x368 > [ 304.347165][ T7488] btrfs_tree_read_lock_nested+0x38/0x330 > [ 304.347181][ T7488] btrfs_read_lock_root_node+0x70/0xb4 > [ 304.347198][ T7488] btrfs_search_slot+0x34c/0x2dc8 > [ 304.347217][ T7488] btrfs_lookup_file_extent+0xe0/0x128 > [ 304.347233][ T7488] btrfs_get_extent+0x2cc/0x1e24 > [ 304.347248][ T7488] btrfs_do_readpage+0x628/0x1258 > [ 304.347270][ T7488] btrfs_read_folio+0x310/0x450 > [ 304.347287][ T7488] btrfs_truncate_block+0x2c0/0xb24 > [ 304.347302][ T7488] btrfs_cont_expand+0x11c/0xba8 > [ 304.347317][ T7488] btrfs_setattr+0x8d8/0x10f4 > [ 304.347332][ T7488] notify_change+0x900/0xfbc > [ 304.347352][ T7488] do_truncate+0x154/0x210 > [ 304.347374][ T7488] vfs_truncate+0x55c/0x66c > [ 304.347394][ T7488] __arm64_sys_truncate+0x16c/0x1e4 > [ 304.347414][ T7488] invoke_syscall+0x88/0x2e0 > [ 304.347433][ T7488] > [ 304.347441][ T7488] [E] dept_page_clear_bit(pg_locked_map:0): > [ 304.347453][ T7488] [<ffff80008249c284>] end_folio_read+0x3e4/0x590 > [ 304.347471][ T7488] stacktrace: > [ 304.347480][ T7488] folio_unlock+0x8c/0x160 > [ 304.347504][ T7488] end_folio_read+0x3e4/0x590 > [ 304.347520][ T7488] btrfs_do_readpage+0x830/0x1258 > [ 304.347536][ T7488] btrfs_read_folio+0x310/0x450 > [ 304.347553][ T7488] btrfs_truncate_block+0x2c0/0xb24 > [ 304.347568][ T7488] btrfs_cont_expand+0x11c/0xba8 > [ 304.347583][ T7488] btrfs_setattr+0x8d8/0x10f4 > [ 304.347598][ T7488] notify_change+0x900/0xfbc > [ 304.347617][ T7488] do_truncate+0x154/0x210 > [ 304.347636][ T7488] vfs_truncate+0x55c/0x66c > [ 304.347656][ T7488] __arm64_sys_truncate+0x16c/0x1e4 > [ 304.347676][ T7488] invoke_syscall+0x88/0x2e0 > [ 304.347695][ T7488] el0_svc_common.constprop.0+0xe8/0x2e0 > [ 304.347714][ T7488] do_el0_svc+0x44/0x60 > [ 304.347732][ T7488] el0_svc+0x50/0x188 > [ 304.347751][ T7488] el0t_64_sync_handler+0x10c/0x140 > [ 304.347772][ T7488] --------------------------------------------------- > [ 304.347782][ T7488] information that might be helpful > [ 304.347791][ T7488] --------------------------------------------------- > [ 304.347803][ T7488] CPU: 1 UID: 0 PID: 7488 Comm: syz-executor Not tainted 6.15.0-rc6-00043-ga83a69ec7f9f #5 PREEMPT > [ 304.347815][ T7488] Hardware name: QEMU KVM Virtual Machine, BIOS 2025.02-8 05/13/2025 > [ 304.347821][ T7488] Call trace: > [ 304.347825][ T7488] show_stack+0x34/0x80 (C) > [ 304.347852][ T7488] dump_stack_lvl+0x104/0x180 > [ 304.347870][ T7488] dump_stack+0x20/0x2c > [ 304.347884][ T7488] cb_check_dl+0x1080/0x10ec > [ 304.347897][ T7488] bfs+0x4d8/0x630 > [ 304.347906][ T7488] add_dep+0x1cc/0x364 > [ 304.347917][ T7488] __dept_wait+0x60c/0x16e0 > [ 304.347928][ T7488] dept_wait+0x168/0x1a8 > [ 304.347940][ T7488] btrfs_clear_buffer_dirty+0x420/0x820 > [ 304.347952][ T7488] __push_leaf_right+0x8f0/0xc70 > [ 304.347967][ T7488] push_leaf_right+0x408/0x628 > [ 304.347980][ T7488] btrfs_del_items+0x974/0xaec > [ 304.347994][ T7488] btrfs_truncate_inode_items+0x1c5c/0x2b00 > [ 304.348007][ T7488] btrfs_evict_inode+0xa4c/0xd38 > [ 304.348023][ T7488] evict+0x340/0x7b0 > [ 304.348036][ T7488] iput+0x4ec/0x840 > [ 304.348048][ T7488] do_unlinkat+0x444/0x59c > [ 304.348062][ T7488] __arm64_sys_unlinkat+0x11c/0x260 > [ 304.348076][ T7488] invoke_syscall+0x88/0x2e0 > [ 304.348090][ T7488] el0_svc_common.constprop.0+0xe8/0x2e0 > [ 304.348105][ T7488] do_el0_svc+0x44/0x60 > [ 304.348118][ T7488] el0_svc+0x50/0x188 > [ 304.348132][ T7488] el0t_64_sync_handler+0x10c/0x140 > [ 304.348148][ T7488] el0t_64_sync+0x198/0x19c > [ 304.386144][ T8054] BTRFS info (device loop0): first mount of filesystem 3a492a15-ac49-4ce6-945e-cef7a687c6c9 > [ 304.389687][ T8054] BTRFS info (device loop0): using crc32c (crc32c-arm64) checksum algorithm > [ 304.389788][ T8054] BTRFS info (device loop0): using free-space-tree > [ 304.701202][ T7488] BTRFS info (device loop3): last unmount of filesystem 3a492a15-ac49-4ce6-945e-cef7a687c6c9 >
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