https://bugzilla.kernel.org/show_bug.cgi?id=214767 Pedram Fard (pedram.fard@xxxxxxxxxx) changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |pedram.fard@xxxxxxxxxx --- Comment #13 from Pedram Fard (pedram.fard@xxxxxxxxxx) --- We have run into a similar issue. We use xfs_freeze to take backup snapshots of our filesystems and occasionally, in the process the xfs_freeze/thaw process turns into zombies. We used the echo w > /proc/sysrq-trigger to get the stack trace: [736826.666940] task:kswapd0 state:D stack: 0 pid: 576 ppid: 2 flags:0x00004000 [736826.674439] Call Trace: [736826.677686] __schedule+0x1f9/0x660 [736826.681593] schedule+0x46/0xb0 [736826.685141] percpu_rwsem_wait+0xa9/0x180 [736826.688867] ? percpu_free_rwsem+0x30/0x30 [736826.692764] __percpu_down_read+0x49/0x60 [736826.696549] xfs_trans_alloc+0x15d/0x170 [736826.700367] xfs_free_eofblocks+0x130/0x1e0 [736826.807546] xfs_fs_destroy_inode+0xa8/0x1b0 [736826.811610] destroy_inode+0x3b/0x70 [736826.815150] dispose_list+0x48/0x60 [736826.818796] prune_icache_sb+0x54/0x80 [736826.822476] super_cache_scan+0x161/0x1e0 [736826.826341] do_shrink_slab+0x145/0x240 [736826.830294] shrink_slab_memcg+0xcd/0x1e0 [736826.834371] shrink_node_memcgs+0x186/0x1c0 [736826.838491] shrink_node+0x14f/0x570 [736826.842088] balance_pgdat+0x232/0x510 [736826.845820] kswapd+0xe2/0x170 [736826.849154] ? balance_pgdat+0x510/0x510 [736826.852944] kthread+0x11b/0x140 [736826.856326] ? __kthread_bind_mask+0x60/0x60 [736826.860313] ret_from_fork+0x22/0x30 [736826.863839] task:systemd-logind state:D stack: 0 pid: 2073 ppid: 1 flags:0x00000084 [736826.871453] Call Trace: [736826.874898] __schedule+0x1f9/0x660 [736826.878898] ? kvm_sched_clock_read+0xd/0x20 [736826.883265] schedule+0x46/0xb0 [736826.887003] rwsem_down_write_slowpath+0x234/0x4b0 [736826.891114] ? __kmalloc+0x154/0x2b0 [736826.894794] prealloc_shrinker+0x4c/0xf0 [736826.898526] alloc_super+0x29a/0x2f0 [736826.902210] ? set_anon_super+0x40/0x40 [736826.905867] sget_fc+0x6c/0x240 [736826.909206] ? shmem_create+0x20/0x20 [736826.912912] get_tree_nodev+0x23/0xb0 [736826.916533] ? bpf_lsm_capset+0x10/0x10 [736826.920310] vfs_get_tree+0x25/0xb0 [736826.923848] do_new_mount+0x152/0x1b0 [736826.927548] __x64_sys_mount+0x103/0x140 [736826.931531] do_syscall_64+0x33/0x40 [736826.935597] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [736826.940323] RIP: 0033:0x7f49f8efcdba [736826.944298] RSP: 002b:00007ffdb98f2658 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 [736826.952238] RAX: ffffffffffffffda RBX: 000055f21a7113a0 RCX: 00007f49f8efcdba [736826.959940] RDX: 000055f218672af0 RSI: 000055f21a721de0 RDI: 000055f218672af0 [736826.967721] RBP: 00007ffdb98f2690 R08: 000055f21a7a51e0 R09: 0000000000000000 [736826.975503] R10: 0000000000000006 R11: 0000000000000202 R12: 0000000000000000 [736826.983253] R13: 00007ffdb98f2740 R14: 00007ffdb98f2820 R15: 0000000000000000 [736826.990979] task:dockerd state:D stack: 0 pid: 6639 ppid: 1 flags:0x00000080 [736826.999289] Call Trace: [736827.002695] __schedule+0x1f9/0x660 [736827.006708] schedule+0x46/0xb0 [736827.010512] rwsem_down_write_slowpath+0x234/0x4b0 [736827.015214] ? __kmalloc+0x154/0x2b0 [736827.019291] prealloc_shrinker+0x4c/0xf0 [736827.023495] alloc_super+0x29a/0x2f0 [736827.027505] sget+0x91/0x220 [736827.031089] ? destroy_super_rcu+0x40/0x40 [736827.035268] ? ovl_get_lowerstack+0x190/0x190 [overlay] [736827.040172] mount_nodev+0x26/0x90 [736827.044070] legacy_get_tree+0x27/0x40 [736827.048169] vfs_get_tree+0x25/0xb0 [736827.052088] do_new_mount+0x152/0x1b0 [736827.056076] __x64_sys_mount+0x103/0x140 [736827.060176] do_syscall_64+0x33/0x40 [736827.064158] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [736827.068950] RIP: 0033:0x55c5416cc2aa [736827.072915] RSP: 002b:000000c0015b2768 EFLAGS: 00000216 ORIG_RAX: 00000000000000a5 [736827.080676] RAX: ffffffffffffffda RBX: 000000c00005e800 RCX: 000055c5416cc2aa [736827.088375] RDX: 000000c000df5320 RSI: 000000c0012db140 RDI: 000000c000df52e8 [736827.095311] RBP: 000000c0015b2800 R08: 000000c0015a0600 R09: 0000000000000000 [736827.102300] R10: 0000000000000000 R11: 0000000000000216 R12: 0000000000000133 [736827.109100] R13: 0000000000000132 R14: 0000000000000200 R15: 0000000000000055 [737030.525416] task:sh state:D stack: 0 pid:27526 ppid: 27517 flags:0x00000080 [737030.532905] Call Trace: [737030.536188] __schedule+0x1f9/0x660 [737030.540060] schedule+0x46/0xb0 [737030.543385] percpu_rwsem_wait+0xa9/0x180 [737030.547220] ? percpu_free_rwsem+0x30/0x30 [737030.551093] __percpu_down_read+0x49/0x60 [737030.555220] mnt_want_write+0x66/0x90 [737030.558966] open_last_lookups+0x30d/0x3f0 [737030.562914] ? path_init+0x2bd/0x3e0 [737030.681735] path_openat+0x88/0x1d0 [737030.685600] ? xfs_iunlock+0x94/0xe0 [737030.689575] do_filp_open+0x88/0x130 [737030.693496] ? __check_object_size.part.0+0x11f/0x140 [737030.698201] do_sys_openat2+0x97/0x150 [737030.702232] __x64_sys_openat+0x54/0x90 [737030.706301] do_syscall_64+0x33/0x40 [737030.710248] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [737030.714945] RIP: 0033:0x7f4502c0d14e [737030.718849] RSP: 002b:00007ffd066be7a0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 [737030.726628] RAX: ffffffffffffffda RBX: 00000000009ba360 RCX: 00007f4502c0d14e [737030.734177] RDX: 0000000000000241 RSI: 00000000009bb8c0 RDI: ffffffffffffff9c [737030.741759] RBP: 00007ffd066be8a0 R08: 0000000000000020 R09: 00000000009bb8c0 [737030.749452] R10: 00000000000001b6 R11: 0000000000000246 R12: 0000000000000000 [737030.757142] R13: 0000000000000001 R14: 0000000000000001 R15: 00000000009bad60 [737030.764836] task:bash state:D stack: 0 pid:27580 ppid: 1 flags:0x00000084 [737030.773068] Call Trace: [737030.776437] __schedule+0x1f9/0x660 [737030.780354] schedule+0x46/0xb0 [737030.784080] percpu_rwsem_wait+0xa9/0x180 [737030.788264] ? percpu_free_rwsem+0x30/0x30 [737030.792476] __percpu_down_read+0x49/0x60 [737030.796642] mnt_want_write+0x66/0x90 [737030.800660] open_last_lookups+0x30d/0x3f0 [737030.804923] ? path_init+0x2bd/0x3e0 [737030.808895] path_openat+0x88/0x1d0 [737030.812800] ? xfs_iunlock+0x94/0xe0 [737030.816745] do_filp_open+0x88/0x130 [737030.820694] ? getname_flags.part.0+0x29/0x1a0 [737030.825097] ? __check_object_size.part.0+0x11f/0x140 [737030.829846] ? audit_alloc_name+0x8c/0xe0 [737030.834010] do_sys_openat2+0x97/0x150 [737030.838056] __x64_sys_openat+0x54/0x90 [737030.842164] do_syscall_64+0x33/0x40 [737030.846146] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [737030.850855] RIP: 0033:0x7f2072a9414e [737030.854822] RSP: 002b:00007ffd855832e0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 [737030.862655] RAX: ffffffffffffffda RBX: 000000000178aab0 RCX: 00007f2072a9414e [737030.870259] RDX: 0000000000000241 RSI: 000000000178af20 RDI: ffffffffffffff9c [737030.877820] RBP: 00007ffd855833e0 R08: 0000000000000020 R09: 000000000178af20 [737030.885463] R10: 00000000000001b6 R11: 0000000000000246 R12: 0000000000000000 [737030.893083] R13: 0000000000000003 R14: 0000000000000001 R15: 000000000178aa60 [736992.593491] task:k state:D stack: 0 pid:11166 ppid: 29014 flags:0x00000184 [736992.600911] Call Trace: [736992.604234] __schedule+0x1f9/0x660 [736992.607842] schedule+0x46/0xb0 [736992.611295] percpu_rwsem_wait+0xa9/0x180 [736992.614999] ? percpu_free_rwsem+0x30/0x30 [736992.618901] __percpu_down_read+0x49/0x60 [736992.622614] mnt_want_write+0x66/0x90 [736992.626323] open_last_lookups+0x30d/0x3f0 [736992.630064] ? path_init+0x2bd/0x3e0 [736992.633795] path_openat+0x88/0x1d0 [736992.637360] do_filp_open+0x88/0x130 [736992.640911] ? getname_flags.part.0+0x29/0x1a0 [736992.645006] ? __check_object_size.part.0+0x11f/0x140 [736992.649268] ? audit_alloc_name+0x8c/0xe0 [736992.653173] do_sys_openat2+0x97/0x150 [736992.656832] __x64_sys_openat+0x54/0x90 [736992.660619] do_syscall_64+0x33/0x40 [736992.664181] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [736992.668543] RIP: 0033:0x7f81dc2d11ae [736992.672208] RSP: 002b:00007ffcff615c00 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 [736992.679509] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f81dc2d11ae [736992.686481] RDX: 0000000000000042 RSI: 00007f81d757e6b8 RDI: 00000000ffffff9c [736992.693723] RBP: 00007f81d7ba14c4 R08: 000000000000003a R09: 0000000000000000 [736992.700684] R10: 00000000000001b6 R11: 0000000000000246 R12: 00007f81d757e6b8 [736992.708136] R13: 00007f81d7ba14c4 R14: 00007f81dbfb45b8 R15: 00007f81d7f3f8fc [736992.715824] task:k state:D stack: 0 pid:11273 ppid: 29014 flags:0x00000184 [736992.724256] Call Trace: [736992.727698] __schedule+0x1f9/0x660 [736992.731616] schedule+0x46/0xb0 [736992.735367] percpu_rwsem_wait+0xa9/0x180 [736992.739512] ? percpu_free_rwsem+0x30/0x30 [736992.743681] __percpu_down_read+0x49/0x60 [736992.747837] mnt_want_write+0x66/0x90 [736992.751896] open_last_lookups+0x30d/0x3f0 [736992.756191] ? path_init+0x2bd/0x3e0 [736992.760175] path_openat+0x88/0x1d0 [736992.764055] do_filp_open+0x88/0x130 [736992.768115] ? getname_flags.part.0+0x29/0x1a0 [736992.772563] ? __check_object_size.part.0+0x11f/0x140 [736992.777391] ? audit_alloc_name+0x8c/0xe0 [736992.781658] do_sys_openat2+0x97/0x150 [736992.785794] __x64_sys_openat+0x54/0x90 [736992.789856] do_syscall_64+0x33/0x40 [736992.793913] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [736992.798746] RIP: 0033:0x7fb7d337f1ae [736992.802878] RSP: 002b:00007ffd9b2dbda0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 [736992.810824] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fb7d337f1ae [736992.818496] RDX: 0000000000000042 RSI: 00007fb7d2e2aa88 RDI: 00000000ffffff9c [736992.826359] RBP: 00007fb7cecdc7dc R08: 0000000000000008 R09: 0000000000000000 [736992.833753] R10: 00000000000001b6 R11: 0000000000000246 R12: 00007fb7d2e2aa88 [736992.840727] R13: 00007fb7d2e2aa7c R14: 00007fb7d3150920 R15: 0000000000000004 [736992.847580] task:tail state:D stack: 0 pid:11608 ppid: 9603 flags:0x00004186 [736992.855146] Call Trace: [736992.858238] __schedule+0x1f9/0x660 [736992.861943] schedule+0x46/0xb0 [736992.865387] percpu_rwsem_wait+0xa9/0x180 [736992.869138] ? percpu_free_rwsem+0x30/0x30 [736992.873134] __percpu_down_read+0x49/0x60 [736992.876948] xfs_trans_alloc+0x15d/0x170 [736992.880854] xfs_free_eofblocks+0x130/0x1e0 [736992.885085] xfs_release+0x13d/0x160 [736992.888807] __fput+0x96/0x240 [736992.892138] task_work_run+0x5f/0x90 [736992.895834] do_exit+0x22c/0x3b0 [736992.899189] ? timerqueue_del+0x1e/0x40 [736992.902967] do_group_exit+0x33/0xa0 [736992.906469] get_signal+0x15d/0x5b0 [736993.013638] arch_do_signal+0x25/0xf0 [736993.017223] exit_to_user_mode_loop+0x8d/0xc0 [736993.021148] exit_to_user_mode_prepare+0x6a/0x70 [736993.025371] syscall_exit_to_user_mode+0x22/0x140 [736993.029417] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [736993.033852] RIP: 0033:0x7f907725e6f4 [736993.037391] RSP: 002b:00007ffcf7722f38 EFLAGS: 00000246 ORIG_RAX: 0000000000000023 [736993.044403] RAX: fffffffffffffdfc RBX: 0000000000000001 RCX: 00007f907725e6f4 [736993.051384] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffcf7722f40 [736993.058190] RBP: 0000000000000000 R08: 00007ffcf7723070 R09: 00007f9077312e80 [736993.065109] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffcf7722f40 [736993.071934] R13: 00007ffcf77256bf R14: 0000560396137440 R15: 0000000000000000 [736996.659414] task:process-exporte state:D stack: 0 pid:30396 ppid: 2204 flags:0x00004082 [736996.666720] Call Trace: [736996.669864] __schedule+0x1f9/0x660 [736996.673371] schedule+0x46/0xb0 [736996.676730] rwsem_down_write_slowpath+0x234/0x4b0 [736996.680991] unregister_memcg_shrinker.isra.0+0x18/0x40 [736996.685377] unregister_shrinker+0x7b/0x80 [736996.689295] deactivate_locked_super+0x29/0xa0 [736996.693241] cleanup_mnt+0x12d/0x190 [736996.696912] task_work_run+0x5f/0x90 [736996.700444] do_exit+0x22c/0x3b0 [736996.703996] do_group_exit+0x33/0xa0 [736996.707581] get_signal+0x15d/0x5b0 [736996.711191] arch_do_signal+0x25/0xf0 [736996.714771] exit_to_user_mode_loop+0x8d/0xc0 [736996.718759] exit_to_user_mode_prepare+0x6a/0x70 [736996.722740] syscall_exit_to_user_mode+0x22/0x140 [736996.726869] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [736996.835174] RIP: 0033:0x4a2c50 [736996.838687] RSP: 002b:000000c000213798 EFLAGS: 00000216 ORIG_RAX: 0000000000000000 [736996.845651] RAX: 0000000000000200 RBX: 000000c000032500 RCX: 00000000004a2c50 [736996.852636] RDX: 0000000000000200 RSI: 000000c0008ef600 RDI: 0000000000000005 [736996.859446] RBP: 000000c0002137e8 R08: 0000000000000000 R09: 0000000000000000 [736996.866347] R10: 0000000000000000 R11: 0000000000000216 R12: ffffffffffffffff [736996.873124] R13: 000000000000000c R14: 000000000000000b R15: 0000000000000010 -- You may reply to this email to add a comment. 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