From: Zygo Blaxell <ce3g8jdj@umail.furryterror.org>
To: Josef Bacik <josef@toxicpanda.com>
Cc: linux-btrfs@vger.kernel.org, kernel-team@fb.com
Subject: Re: [PATCH v7 00/38] Cleanup error handling in relocation
Date: Wed, 16 Dec 2020 14:56:03 -0500 [thread overview]
Message-ID: <20201216195603.GP31381@hungrycats.org> (raw)
In-Reply-To: <cover.1608135849.git.josef@toxicpanda.com>
On Wed, Dec 16, 2020 at 11:26:16AM -0500, Josef Bacik wrote:
> v6->v7:
> - Broke up the series into 3 series, 1 for cosmetic things, 1 for all the major
> issues (including those reported on v6 of this set), and this new set which is
> solely the error handling related patches for relocation. It's still a lot of
> patches, sorry about that.
So far it lockdepped, but it is still running:
[Wed Dec 16 13:30:45 2020] irq event stamp: 5875656
[Wed Dec 16 13:30:45 2020] ======================================================
[Wed Dec 16 13:30:45 2020] hardirqs last enabled at (5875655): [<ffffffff98a82e37>] _raw_spin_unlock_irqrestore+0x47/0x50
[Wed Dec 16 13:30:45 2020] WARNING: possible circular locking dependency detected
[Wed Dec 16 13:30:45 2020] hardirqs last disabled at (5875656): [<ffffffff98a8368d>] _raw_spin_lock_irqsave+0x7d/0xa0
[Wed Dec 16 13:30:45 2020] softirqs last enabled at (5874382): [<ffffffff98e0044f>] __do_softirq+0x44f/0x5a7
[Wed Dec 16 13:30:45 2020] 5.10.0-39fbe74d1bbc-josef+ #1 Tainted: G W
[Wed Dec 16 13:30:45 2020] softirqs last disabled at (5874369): [<ffffffff98c01122>] asm_call_irq_on_stack+0x12/0x20
[Wed Dec 16 13:30:45 2020] ------------------------------------------------------
[Wed Dec 16 13:30:45 2020] btrfs/6366 is trying to acquire lock:
[Wed Dec 16 13:30:45 2020] ffff88816f146a28 (btrfs-treloc-03){+.+.}-{3:3}, at: __btrfs_tree_lock+0x29/0x190
[Wed Dec 16 13:30:45 2020]
but task is already holding lock:
[Wed Dec 16 13:30:45 2020] ffff88810167c598 (btrfs-tree-02){++++}-{3:3}, at: __btrfs_tree_lock+0x29/0x190
[Wed Dec 16 13:30:45 2020]
which lock already depends on the new lock.
[Wed Dec 16 13:30:45 2020]
the existing dependency chain (in reverse order) is:
[Wed Dec 16 13:30:45 2020]
-> #1 (btrfs-tree-02){++++}-{3:3}:
[Wed Dec 16 13:30:45 2020] down_write_nested+0xa6/0x2d0
[Wed Dec 16 13:30:45 2020] __btrfs_tree_lock+0x29/0x190
[Wed Dec 16 13:30:45 2020] btrfs_tree_lock+0x10/0x20
[Wed Dec 16 13:30:45 2020] btrfs_search_slot+0x474/0x1090
[Wed Dec 16 13:30:45 2020] do_relocation+0x2a0/0xc20
[Wed Dec 16 13:30:45 2020] relocate_tree_blocks+0x733/0xb90
[Wed Dec 16 13:30:45 2020] relocate_block_group+0x2eb/0x780
[Wed Dec 16 13:30:45 2020] btrfs_relocate_block_group+0x26e/0x4c0
[Wed Dec 16 13:30:45 2020] btrfs_relocate_chunk+0x52/0x120
[Wed Dec 16 13:30:45 2020] btrfs_balance+0xe2e/0x1900
[Wed Dec 16 13:30:45 2020] btrfs_ioctl_balance+0x1f9/0x460
[Wed Dec 16 13:30:45 2020] btrfs_ioctl+0xe9c/0x4360
[Wed Dec 16 13:30:45 2020] __x64_sys_ioctl+0xc3/0x100
[Wed Dec 16 13:30:45 2020] do_syscall_64+0x37/0x80
[Wed Dec 16 13:30:45 2020] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[Wed Dec 16 13:30:45 2020]
-> #0 (btrfs-treloc-03){+.+.}-{3:3}:
[Wed Dec 16 13:30:45 2020] __lock_acquire+0x1ebb/0x2880
[Wed Dec 16 13:30:45 2020] lock_acquire+0x192/0x550
[Wed Dec 16 13:30:45 2020] down_write_nested+0xa6/0x2d0
[Wed Dec 16 13:30:45 2020] __btrfs_tree_lock+0x29/0x190
[Wed Dec 16 13:30:45 2020] btrfs_lock_root_node+0x5b/0x190
[Wed Dec 16 13:30:45 2020] btrfs_search_slot+0xc8d/0x1090
[Wed Dec 16 13:30:45 2020] replace_path.isra.36+0x8a2/0xee0
[Wed Dec 16 13:30:45 2020] merge_reloc_root+0x58c/0xc10
[Wed Dec 16 13:30:45 2020] merge_reloc_roots+0x1e6/0x4a0
[Wed Dec 16 13:30:45 2020] relocate_block_group+0x3d2/0x780
[Wed Dec 16 13:30:45 2020] btrfs_relocate_block_group+0x26e/0x4c0
[Wed Dec 16 13:30:45 2020] btrfs_relocate_chunk+0x52/0x120
[Wed Dec 16 13:30:45 2020] btrfs_balance+0xe2e/0x1900
[Wed Dec 16 13:30:45 2020] btrfs_ioctl_balance+0x1f9/0x460
[Wed Dec 16 13:30:45 2020] btrfs_ioctl+0xe9c/0x4360
[Wed Dec 16 13:30:45 2020] __x64_sys_ioctl+0xc3/0x100
[Wed Dec 16 13:30:45 2020] do_syscall_64+0x37/0x80
[Wed Dec 16 13:30:45 2020] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[Wed Dec 16 13:30:45 2020]
other info that might help us debug this:
[Wed Dec 16 13:30:45 2020] Possible unsafe locking scenario:
[Wed Dec 16 13:30:45 2020] CPU0 CPU1
[Wed Dec 16 13:30:45 2020] ---- ----
[Wed Dec 16 13:30:45 2020] lock(btrfs-tree-02);
[Wed Dec 16 13:30:45 2020] lock(btrfs-treloc-03);
[Wed Dec 16 13:30:45 2020] lock(btrfs-tree-02);
[Wed Dec 16 13:30:45 2020] lock(btrfs-treloc-03);
[Wed Dec 16 13:30:45 2020]
*** DEADLOCK ***
[Wed Dec 16 13:30:45 2020] 5 locks held by btrfs/6366:
[Wed Dec 16 13:30:45 2020] #0: ffff888128318498 (sb_writers#13){.+.+}-{0:0}, at: btrfs_ioctl_balance+0x71/0x460
[Wed Dec 16 13:30:45 2020] #1: ffff88810d2f22c8 (&fs_info->delete_unused_bgs_mutex){+.+.}-{3:3}, at: btrfs_balance+0xa54/0x1900
[Wed Dec 16 13:30:45 2020] #2: ffff88810d2f08f0 (&fs_info->cleaner_mutex){+.+.}-{3:3}, at: btrfs_relocate_block_group+0x266/0x4c0
[Wed Dec 16 13:30:45 2020] #3: ffff8881283186b8 (sb_internal#2){.+.+}-{0:0}, at: btrfs_start_transaction+0x1e/0x20
[Wed Dec 16 13:30:45 2020] #4: ffff88810167c598 (btrfs-tree-02){++++}-{3:3}, at: __btrfs_tree_lock+0x29/0x190
[Wed Dec 16 13:30:45 2020]
stack backtrace:
[Wed Dec 16 13:30:45 2020] CPU: 0 PID: 6366 Comm: btrfs Tainted: G W 5.10.0-39fbe74d1bbc-josef+ #1
[Wed Dec 16 13:30:45 2020] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
[Wed Dec 16 13:30:45 2020] Call Trace:
[Wed Dec 16 13:30:45 2020] dump_stack+0xbc/0xf9
[Wed Dec 16 13:30:45 2020] print_circular_bug.isra.42.cold.67+0x146/0x14b
[Wed Dec 16 13:30:45 2020] check_noncircular+0x219/0x250
[Wed Dec 16 13:30:45 2020] ? print_circular_bug.isra.42+0x230/0x230
[Wed Dec 16 13:30:45 2020] ? pvclock_clocksource_read+0xeb/0x190
[Wed Dec 16 13:30:45 2020] ? __kasan_check_write+0x14/0x20
[Wed Dec 16 13:30:45 2020] ? lockdep_lock+0xaa/0x160
[Wed Dec 16 13:30:45 2020] __lock_acquire+0x1ebb/0x2880
[Wed Dec 16 13:30:45 2020] ? register_lock_class+0x8f0/0x8f0
[Wed Dec 16 13:30:45 2020] ? rcu_read_lock_sched_held+0xa1/0xd0
[Wed Dec 16 13:30:45 2020] ? rcu_read_lock_bh_held+0xb0/0xb0
[Wed Dec 16 13:30:45 2020] lock_acquire+0x192/0x550
[Wed Dec 16 13:30:45 2020] ? __btrfs_tree_lock+0x29/0x190
[Wed Dec 16 13:30:45 2020] ? check_flags+0x30/0x30
[Wed Dec 16 13:30:45 2020] ? ___might_sleep+0x10f/0x1e0
[Wed Dec 16 13:30:46 2020] ? __might_sleep+0x71/0xe0
[Wed Dec 16 13:30:46 2020] down_write_nested+0xa6/0x2d0
[Wed Dec 16 13:30:46 2020] ? __btrfs_tree_lock+0x29/0x190
[Wed Dec 16 13:30:46 2020] ? btrfs_root_node+0x23/0x200
[Wed Dec 16 13:30:46 2020] ? _down_write_nest_lock+0x2c0/0x2c0
[Wed Dec 16 13:30:46 2020] ? rcu_read_lock_sched_held+0xd0/0xd0
[Wed Dec 16 13:30:46 2020] __btrfs_tree_lock+0x29/0x190
[Wed Dec 16 13:30:46 2020] btrfs_lock_root_node+0x5b/0x190
[Wed Dec 16 13:30:46 2020] btrfs_search_slot+0xc8d/0x1090
[Wed Dec 16 13:30:46 2020] ? __kasan_check_read+0x11/0x20
[Wed Dec 16 13:30:46 2020] ? check_flags.part.50+0x6c/0x1e0
[Wed Dec 16 13:30:46 2020] ? split_leaf+0xa20/0xa20
[Wed Dec 16 13:30:46 2020] ? _raw_spin_unlock+0x22/0x30
[Wed Dec 16 13:30:46 2020] ? release_extent_buffer+0x225/0x280
[Wed Dec 16 13:30:46 2020] ? __kasan_check_write+0x14/0x20
[Wed Dec 16 13:30:46 2020] ? free_extent_buffer.part.53+0x90/0x140
[Wed Dec 16 13:30:46 2020] ? free_extent_buffer+0x13/0x20
[Wed Dec 16 13:30:46 2020] replace_path.isra.36+0x8a2/0xee0
[Wed Dec 16 13:30:46 2020] ? describe_relocation.isra.30+0xf0/0xf0
[Wed Dec 16 13:30:46 2020] ? check_setget_bounds+0x2a/0x60
[Wed Dec 16 13:30:46 2020] ? btrfs_get_64+0x1e8/0x200
[Wed Dec 16 13:30:46 2020] ? btrfs_get_token_64+0x350/0x350
[Wed Dec 16 13:30:46 2020] ? memcpy+0x4d/0x60
[Wed Dec 16 13:30:46 2020] merge_reloc_root+0x58c/0xc10
[Wed Dec 16 13:30:46 2020] ? prepare_to_merge+0x660/0x660
[Wed Dec 16 13:30:46 2020] ? btrfs_lookup_fs_root+0x113/0x180
[Wed Dec 16 13:30:46 2020] ? btrfs_end_super_write+0x3c0/0x3c0
[Wed Dec 16 13:30:46 2020] ? mutex_lock_io_nested+0xc20/0xc20
[Wed Dec 16 13:30:46 2020] ? btrfs_get_root_ref+0x24a/0x470
[Wed Dec 16 13:30:46 2020] ? __mutex_unlock_slowpath+0xb2/0x400
[Wed Dec 16 13:30:46 2020] ? btrfs_find_highest_objectid+0x1b0/0x1b0
[Wed Dec 16 13:30:46 2020] ? btrfs_init_reloc_root+0x370/0x370
[Wed Dec 16 13:30:46 2020] ? __kasan_check_write+0x14/0x20
[Wed Dec 16 13:30:46 2020] merge_reloc_roots+0x1e6/0x4a0
[Wed Dec 16 13:30:46 2020] ? merge_reloc_root+0xc10/0xc10
[Wed Dec 16 13:30:46 2020] ? btrfs_block_rsv_release+0x3a7/0x620
[Wed Dec 16 13:30:46 2020] relocate_block_group+0x3d2/0x780
[Wed Dec 16 13:30:46 2020] ? btrfs_defrag_leaves+0x250/0x650
[Wed Dec 16 13:30:46 2020] ? merge_reloc_roots+0x4a0/0x4a0
[Wed Dec 16 13:30:46 2020] btrfs_relocate_block_group+0x26e/0x4c0
[Wed Dec 16 13:30:46 2020] btrfs_relocate_chunk+0x52/0x120
[Wed Dec 16 13:30:46 2020] btrfs_balance+0xe2e/0x1900
[Wed Dec 16 13:30:46 2020] ? pvclock_clocksource_read+0xeb/0x190
[Wed Dec 16 13:30:46 2020] ? btrfs_relocate_chunk+0x120/0x120
[Wed Dec 16 13:30:46 2020] ? lock_acquired+0x7f/0x5e0
[Wed Dec 16 13:30:46 2020] ? do_raw_spin_lock+0x1e0/0x1e0
[Wed Dec 16 13:30:46 2020] ? do_raw_spin_unlock+0xa8/0x140
[Wed Dec 16 13:30:46 2020] btrfs_ioctl_balance+0x1f9/0x460
[Wed Dec 16 13:30:46 2020] btrfs_ioctl+0xe9c/0x4360
[Wed Dec 16 13:30:46 2020] ? __kasan_check_read+0x11/0x20
[Wed Dec 16 13:30:46 2020] ? check_chain_key+0x1f4/0x2f0
[Wed Dec 16 13:30:46 2020] ? __asan_loadN+0xf/0x20
[Wed Dec 16 13:30:46 2020] ? btrfs_ioctl_get_supported_features+0x30/0x30
[Wed Dec 16 13:30:46 2020] ? kvm_sched_clock_read+0x18/0x30
[Wed Dec 16 13:30:46 2020] ? check_chain_key+0x1f4/0x2f0
[Wed Dec 16 13:30:46 2020] ? lock_downgrade+0x3f0/0x3f0
[Wed Dec 16 13:30:46 2020] ? handle_mm_fault+0xad6/0x2150
[Wed Dec 16 13:30:46 2020] ? do_vfs_ioctl+0xfc/0x9d0
[Wed Dec 16 13:30:46 2020] ? ioctl_file_clone+0xe0/0xe0
[Wed Dec 16 13:30:46 2020] ? check_flags.part.50+0x6c/0x1e0
[Wed Dec 16 13:30:46 2020] ? check_flags.part.50+0x6c/0x1e0
[Wed Dec 16 13:30:46 2020] ? check_flags+0x26/0x30
[Wed Dec 16 13:30:46 2020] ? lock_is_held_type+0xc3/0xf0
[Wed Dec 16 13:30:46 2020] ? syscall_enter_from_user_mode+0x1b/0x60
[Wed Dec 16 13:30:46 2020] ? do_syscall_64+0x13/0x80
[Wed Dec 16 13:30:46 2020] ? rcu_read_lock_sched_held+0xa1/0xd0
[Wed Dec 16 13:30:46 2020] ? __kasan_check_read+0x11/0x20
[Wed Dec 16 13:30:46 2020] ? __fget_light+0xae/0x110
[Wed Dec 16 13:30:46 2020] __x64_sys_ioctl+0xc3/0x100
[Wed Dec 16 13:30:46 2020] do_syscall_64+0x37/0x80
[Wed Dec 16 13:30:46 2020] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[Wed Dec 16 13:30:46 2020] RIP: 0033:0x7f7c98b07427
[Wed Dec 16 13:30:46 2020] Code: 00 00 90 48 8b 05 69 aa 0c 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 39 aa 0c 00 f7 d8 64 89 01 48
[Wed Dec 16 13:30:46 2020] RSP: 002b:00007fff0cb87938 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
[Wed Dec 16 13:30:46 2020] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f7c98b07427
[Wed Dec 16 13:30:46 2020] RDX: 00007fff0cb87948 RSI: 00000000c4009420 RDI: 0000000000000003
[Wed Dec 16 13:30:46 2020] RBP: 0000000000000003 R08: 0000000000000003 R09: 0000000000000078
[Wed Dec 16 13:30:46 2020] R10: fffffffffffff59d R11: 0000000000000202 R12: 0000000000000002
[Wed Dec 16 13:30:46 2020] R13: 00007fff0cb89a3f R14: 0000557c21f8c119 R15: 0000000000000000
[Wed Dec 16 13:31:03 2020] BTRFS info (device dm-0): found 2 extents, loops 2, stage: update data pointers
[Wed Dec 16 13:31:59 2020] BTRFS info (device dm-0): relocating block group 981598208000 flags data
next prev parent reply other threads:[~2020-12-16 19:57 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-16 16:26 [PATCH v7 00/38] Cleanup error handling in relocation Josef Bacik
2020-12-16 16:26 ` [PATCH v7 01/38] btrfs: convert BUG_ON()'s in relocate_tree_block Josef Bacik
2020-12-16 16:26 ` [PATCH v7 02/38] btrfs: return an error from btrfs_record_root_in_trans Josef Bacik
2021-02-26 19:03 ` David Sterba
2020-12-16 16:26 ` [PATCH v7 03/38] btrfs: handle errors from select_reloc_root() Josef Bacik
2021-02-26 18:30 ` David Sterba
2021-03-11 18:10 ` Josef Bacik
2021-04-09 19:24 ` David Sterba
2020-12-16 16:26 ` [PATCH v7 04/38] btrfs: convert BUG_ON()'s in select_reloc_root() to proper errors Josef Bacik
2020-12-16 16:26 ` [PATCH v7 05/38] btrfs: check record_root_in_trans related failures in select_reloc_root Josef Bacik
2020-12-16 16:26 ` [PATCH v7 06/38] btrfs: do proper error handling in record_reloc_root_in_trans Josef Bacik
2020-12-16 16:26 ` [PATCH v7 07/38] btrfs: handle btrfs_record_root_in_trans failure in btrfs_rename_exchange Josef Bacik
2020-12-16 16:26 ` [PATCH v7 08/38] btrfs: handle btrfs_record_root_in_trans failure in btrfs_rename Josef Bacik
2020-12-16 16:26 ` [PATCH v7 09/38] btrfs: handle btrfs_record_root_in_trans failure in btrfs_delete_subvolume Josef Bacik
2020-12-16 16:26 ` [PATCH v7 10/38] btrfs: handle btrfs_record_root_in_trans failure in btrfs_recover_log_trees Josef Bacik
2020-12-16 16:26 ` [PATCH v7 11/38] btrfs: handle btrfs_record_root_in_trans failure in create_subvol Josef Bacik
2020-12-16 16:26 ` [PATCH v7 12/38] btrfs: btrfs: handle btrfs_record_root_in_trans failure in relocate_tree_block Josef Bacik
2020-12-16 16:26 ` [PATCH v7 13/38] btrfs: handle btrfs_record_root_in_trans failure in start_transaction Josef Bacik
2020-12-16 16:26 ` [PATCH v7 14/38] btrfs: handle record_root_in_trans failure in qgroup_account_snapshot Josef Bacik
2020-12-16 16:26 ` [PATCH v7 15/38] btrfs: handle record_root_in_trans failure in btrfs_record_root_in_trans Josef Bacik
2020-12-16 16:26 ` [PATCH v7 16/38] btrfs: handle record_root_in_trans failure in create_pending_snapshot Josef Bacik
2020-12-16 16:26 ` [PATCH v7 17/38] btrfs: do not panic in __add_reloc_root Josef Bacik
2020-12-16 16:26 ` [PATCH v7 18/38] btrfs: have proper error handling in btrfs_init_reloc_root Josef Bacik
2020-12-16 16:26 ` [PATCH v7 19/38] btrfs: do proper error handling in create_reloc_root Josef Bacik
2020-12-16 16:26 ` [PATCH v7 20/38] btrfs: validate ->reloc_root after recording root in trans Josef Bacik
2020-12-16 16:26 ` [PATCH v7 21/38] btrfs: handle btrfs_update_reloc_root failure in commit_fs_roots Josef Bacik
2020-12-16 16:26 ` [PATCH v7 22/38] btrfs: change insert_dirty_subvol to return errors Josef Bacik
2020-12-16 16:26 ` [PATCH v7 23/38] btrfs: handle btrfs_update_reloc_root failure in insert_dirty_subvol Josef Bacik
2020-12-16 16:26 ` [PATCH v7 24/38] btrfs: handle btrfs_update_reloc_root failure in prepare_to_merge Josef Bacik
2020-12-16 16:26 ` [PATCH v7 25/38] btrfs: do proper error handling in btrfs_update_reloc_root Josef Bacik
2020-12-16 16:26 ` [PATCH v7 26/38] btrfs: convert logic BUG_ON()'s in replace_path to ASSERT()'s Josef Bacik
2020-12-16 16:26 ` [PATCH v7 27/38] btrfs: handle btrfs_cow_block errors in replace_path Josef Bacik
2020-12-16 16:26 ` [PATCH v7 28/38] btrfs: handle btrfs_search_slot failure " Josef Bacik
2020-12-16 16:26 ` [PATCH v7 29/38] btrfs: handle errors in reference count manipulation " Josef Bacik
2020-12-16 16:26 ` [PATCH v7 30/38] btrfs: handle extent reference errors in do_relocation Josef Bacik
2020-12-16 16:26 ` [PATCH v7 31/38] btrfs: check for BTRFS_BLOCK_FLAG_FULL_BACKREF being set improperly Josef Bacik
2020-12-16 16:26 ` [PATCH v7 32/38] btrfs: remove the extent item sanity checks in relocate_block_group Josef Bacik
2020-12-16 16:26 ` [PATCH v7 33/38] btrfs: do proper error handling in create_reloc_inode Josef Bacik
2020-12-16 16:26 ` [PATCH v7 34/38] btrfs: handle __add_reloc_root failures in btrfs_recover_relocation Josef Bacik
2020-12-16 16:26 ` [PATCH v7 35/38] btrfs: cleanup error handling in prepare_to_merge Josef Bacik
2020-12-16 16:26 ` [PATCH v7 36/38] btrfs: handle extent corruption with select_one_root properly Josef Bacik
2020-12-16 16:26 ` [PATCH v7 37/38] btrfs: do proper error handling in merge_reloc_roots Josef Bacik
2020-12-16 16:26 ` [PATCH v7 38/38] btrfs: check return value of btrfs_commit_transaction in relocation Josef Bacik
2020-12-16 19:56 ` Zygo Blaxell [this message]
2020-12-18 16:25 ` [PATCH v7 00/38] Cleanup error handling " Zygo Blaxell
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