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([175.143.94.228]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2a88b414cc7sm64377665ad.33.2026.01.29.20.14.47 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 29 Jan 2026 20:14:51 -0800 (PST) Message-ID: Date: Fri, 30 Jan 2026 12:14:45 +0800 Precedence: bulk X-Mailing-List: linux-btrfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Sun YangKai Subject: Re: [PATCH] btrfs: prevent COW amplification during btrfs_search_slot To: Leo Martins , Filipe Manana Cc: linux-btrfs@vger.kernel.org, kernel-team@fb.com References: <20260130001254.83750-1-loemra.dev@gmail.com> Content-Language: en-US In-Reply-To: <20260130001254.83750-1-loemra.dev@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 2026/1/30 08:12, Leo Martins wrote: > On Thu, 29 Jan 2026 11:52:07 +0000 Filipe Manana wrote: >> On Tue, Jan 27, 2026 at 8:43 PM Leo Martins wrote: >>> I've been investigating enospcs at Meta and have observed a strange >>> pattern where filesystems are enospcing with lots of unallocated space >>> (> 100G). Sample dmesg dump at bottom of message. >>> >>> btrfs_insert_delayed_dir_index is attempting to migrate some reservation >>> from the transaction block reserve and finding it exhausted leading to a >>> warning and enospc. This is a bug as the reservations are meant to be >>> worst case. It should be impossible to exhaust the transaction block >>> reserve. >>> >>> Some tracing of affected hosts revealed that there were single >>> btrfs_search_slot calls that were COWing 100s of times. I was able to >>> reproduce this behavior locally by creating a very constrained cgroup >>> and producing a lot of concurrent filesystem operations. Here's the >>> pattern: >>> >>> 1. btrfs_search_slot() begins tree traversal with cow=1 >>> 2. Node at level N needs COW (old generation or WRITTEN flag set) >>> 3. btrfs_cow_block() allocates new node, updates parent pointer >>> 4. Traversal continues, but hits a condition requiring restart (e.g., node >>> not cached, lock contention, need higher write_lock_level) >>> 5. btrfs_release_path() releases all locks and references >>> 6. Memory pressure triggers writeback on the COW'd node >>> 7. lock_extent_buffer_for_io() clears EXTENT_BUFFER_DIRTY and sets >>> BTRFS_HEADER_FLAG_WRITTEN >>> 8. goto again - traversal restarts from root >>> 9. Traversal reaches the freshly COW'd node >>> 10. should_cow_block() sees WRITTEN flag set, returns true >>> 11. btrfs_cow_block() allocates another new node - same logical position, >>> new physical location, new reservation consumed >>> 12. Steps 4-11 repeat indefinitely under sustained memory pressure >>> >>> Note this behavior should be much harder to trigger since Boris's >>> AS_KERNEL_FILE changes that make it so that extent_buffer pages aren't >>> accounted for in user cgroups. However, I believe it >>> would still be an issue under global memory pressure. >>> Link:https://lore.kernel.org/linux-btrfs/cover.1755812945.git.boris@bur.io/ >>> >>> This COW amplification breaks the idea that transaction reservations are >>> worst case as any search slot call could find itself in this COW loop and >>> exhaust its reservation. >>> >>> My proposed solution is to temporarily pin extent buffers for the >>> lifetime of btrfs_search_slot. This prevents the massive COW >>> amplification that can be seen during high memory pressure. >>> >>> The implementation uses a local xarray to track COW'd buffers for the >>> duration of the search. The xarray stores extent_buffer pointers without >>> taking additional references; this is safe because tracked buffers remain >>> dirty (writeback_blockers prevents the dirty bit from being cleared) and >>> dirty buffers cannot be reclaimed by memory pressure. >>> >>> Synchronization is provided by eb->lock: increments in >>> btrfs_search_slot_track_cow() occur while holding the write lock, and >>> the check in lock_extent_buffer_for_io() also holds the write lock via >>> btrfs_tree_lock(). Decrements don't require eb->lock because >>> writeback_blockers is atomic and merely indicates "don't write yet". >>> Once we decrement, we're done and don't care if writeback proceeds >>> immediately. >> This seems too complex to me. >> >> So this problem is very similar to some idea I had a few years ago but >> never managed to implement. >> It was about avoiding unnecessary COW, not for this space reservation >> exhaustion due to sustained memory pressure, but it would solve it >> too. >> >> The idea was that we do unnecessary COW in cases like this: >> >> 1) We COW a path in some tree and we are at transaction N; >> >> 2) Writeback happened for the extent buffers in that path while we are >> in the same transaction, because we reached the 32M limit and some >> task called btrfs_btree_balance_dirty() or something else triggered >> writeback of the btree inode; >> >> 3) While still at transaction N, we visit the same path to add an item >> to a leaf, or modify an item, whatever. Because the extent buffers >> have BTRFS_HEADER_FLAG_WRITTEN, we COW them again (should_cow_block() >> returns true). >> >> So during the lifetime of a transaction we can have a lot of >> unnecessary COW - we spend more time allocating extents, allocating >> memory, copying extent buffer data, use more space per transaction, >> etc. >> >> The idea was to not COW when an extent buffer has >> BTRFS_HEADER_FLAG_WRITTEN set, but only if its generation >> (btrfs_header_generation(eb)) matches the current transaction. >> That is safe because there's no committed tree that points to an >> extent buffer created in the current transaction. >> >> Any further modification to the extent buffer must be sure that the >> EXTENT_BUFFER_DIRTY flag is set, that the eb range is still in the >> transaction's dirty_pages io tree, etc, so that we don't miss writing >> the extent buffer to the same location again before the transaction >> commits the superblocks. >> >> Have you considered an approach like this? > I had not considered this, but it is a great idea. > > My first thought is that implementing this could be as simple > as removing the BTRFS_HEADER_FLAG_WRITTEN check. However, this > would mess with the assumptions around the log tree. From > btrfs_sync_log(): After a fast glance and some tests, I found things might not be that easy. The problem is not only the log tree. > /* > * IO has been started, blocks of the log tree have WRITTEN flag set > * in their headers. new modifications of the log will be written to > * new positions. so it's safe to allow log writers to go in. > */ > > ^ Assumes that WRITTEN blocks will be COW'd. > > The issue looks like: > > 1. fsync A COWs eb > 2. fsync A lock_extent_buffer_for_io(); sets WRITTEN, unlocks tree > 3. fsync B does __not__ COW eb and modifies it > 4. fsync A writes modified eb to disk > 5. CRASH; the log tree is corrupted > > One way to avoid that is to keep the current behavior for the log > tree, but that leaves the potential for COW amplification... I tested with a patch like this: @@ -624,14 +624,18 @@ static inline bool should_cow_block(const struct btrfs_trans_handle *trans,         if (btrfs_header_generation(buf) != trans->transid)                 return true; -       if (btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) -               return true; -         /* Ensure we can see the FORCE_COW bit. */         smp_mb__before_atomic();         if (test_bit(BTRFS_ROOT_FORCE_COW, &root->state))                 return true; +       if (btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) { +               if (btrfs_root_id(root) == BTRFS_TREE_LOG_OBJECTID) +                       return true; +               btrfs_mark_buffer_dirty(trans, buf); +               return false; +       } +         if (btrfs_root_id(root) == BTRFS_TREE_RELOC_OBJECTID)                 return false; And get some errors like this: [  +0.090163] [ T2589] run fstests btrfs/004 at 2026-01-30 11:53:37 [  +0.432352] [T11685] BTRFS: device fsid 1fb397fc-97a7-44dd-9602-dd38b74bc391 devid 1 transid 8 /dev/loop1 (7:1) scanned by mount (11685) [  +0.000351] [T11685] BTRFS info (device loop1): first mount of filesystem 1fb397fc-97a7-44dd-9602-dd38b74bc391 [  +0.000014] [T11685] BTRFS info (device loop1): using crc32c (crc32c-lib) checksum algorithm [  +0.001298] [T11685] BTRFS info (device loop1): checking UUID tree [  +0.000039] [T11685] BTRFS info (device loop1): enabling ssd optimizations [  +0.000003] [T11685] BTRFS info (device loop1): turning on async discard [  +0.000002] [T11685] BTRFS info (device loop1): enabling free space tree [  +1.051781] [T11703] page: refcount:2 mapcount:0 mapping:00000000eb6d7caa index:0x2348 pfn:0x1caebf [  +0.000008] [T11703] memcg:ffff9b3300263cc0 [  +0.000003] [T11703] aops:0xffffffffc0354040 ino:1 [  +0.000024] [T11703] flags: 0x4e0000000000423e(referenced|uptodate|dirty|lru|workingset|private|writeback|zone=1) [  +0.000007] [T11703] raw: 4e0000000000423e fffff74a872bb908 fffff74a84206a88 ffff9b33c6706880 [  +0.000004] [T11703] raw: 0000000000002348 ffff9b334be522d0 00000002ffffffff ffff9b3300263cc0 [  +0.000002] [T11703] page dumped because: eb page dump [  +0.000003] [T11703] BTRFS critical (device loop1): corrupt leaf: root=5 block=36995072 slot=118 ino=406 file_offset=94208, invalid ram_bytes for file extent, have 8660273067269322872, should be aligned to 4096 [  +0.000013] [T11703] BTRFS info (device loop1): leaf 36995072 gen 33 total ptrs 128 free space 2857 owner 5 [  +0.000006] [T11703]     item 0 key (386 DIR_ITEM 238230307) itemoff 16249 itemsize 34 [  +0.000004] [T11703]         location key (462 1 0) type 2 [  +0.000003] [T11703]         transid 33 data_len 0 name_len 4 [  +0.000003] [T11703]     item 1 key (386 DIR_ITEM 1473745676) itemoff 16216 itemsize 33 [  +0.000004] [T11703]         location key (376 1 0) type 3 [  +0.000002] [T11703]         transid 30 data_len 0 name_len 3 [  +0.000003] [T11703]     item 2 key (386 DIR_ITEM 2243137595) itemoff 16182 itemsize 34 [  +0.000004] [T11703]         location key (413 1 0) type 1 [  +0.000002] [T11703]         transid 32 data_len 0 name_len 4 [  +0.000003] [T11703]     item 3 key (386 DIR_ITEM 2980467489) itemoff 16148 itemsize 34 [  +0.000003] [T11703]         location key (478 1 0) type 1 [  +0.000002] [T11703]         transid 33 data_len 0 name_len 4 [  +0.000003] [T11703]     item 4 key (386 DIR_ITEM 3091124746) itemoff 16115 itemsize 33 [  +0.000002] [T11703]         location key (474 1 0) type 3 [  +0.000002] [T11703]         transid 33 data_len 0 name_len 3 [  +0.000001] [T11703]     item 5 key (386 DIR_ITEM 4127802504) itemoff 16082 itemsize 33 [  +0.000003] [T11703]         location key (407 1 0) type 2 [  +0.000001] [T11703]         transid 27 data_len 0 name_len 3 [  +0.000002] [T11703]     item 6 key (386 DIR_INDEX 2) itemoff 16049 itemsize 33 [  +0.000003] [T11703]         location key (407 1 0) type 2 [  +0.000001] [T11703]         transid 27 data_len 0 name_len 3 [  +0.000002] [T11703]     item 7 key (386 DIR_INDEX 4) itemoff 16016 itemsize 33 [  +0.000002] [T11703]         location key (376 1 0) type 3 [  +0.000002] [T11703]         transid 30 data_len 0 name_len 3 [  +0.000002] [T11703]     item 8 key (386 DIR_INDEX 5) itemoff 15982 itemsize 34 [  +0.000002] [T11703]         location key (413 1 0) type 1 [  +0.000002] [T11703]         transid 32 data_len 0 name_len 4 [  +0.000002] [T11703]     item 9 key (386 DIR_INDEX 6) itemoff 15948 itemsize 34 [  +0.000002] [T11703]         location key (462 1 0) type 2 [  +0.000002] [T11703]         transid 33 data_len 0 name_len 4 [  +0.000001] [T11703]     item 10 key (386 DIR_INDEX 7) itemoff 15915 itemsize 33 [  +0.000003] [T11703]         location key (474 1 0) type 3 [  +0.000001] [T11703]         transid 33 data_len 0 name_len 3 [  +0.000002] [T11703]     item 11 key (386 DIR_INDEX 8) itemoff 15881 itemsize 34 [  +0.000002] [T11703]         location key (478 1 0) type 1 [  +0.000002] [T11703]         transid 33 data_len 0 name_len 4 [  +0.000002] [T11703]     item 12 key (387 INODE_ITEM 0) itemoff 15721 itemsize 160 [  +0.000002] [T11703]         inode generation 25 transid 25 size 0 nbytes 0 [  +0.000003] [T11703]         block group 0 mode 20444 links 1 uid 0 gid 0 [  +0.000002] [T11703]         rdev 0 sequence 0 flags 0x0 [  +0.000002] [T11703]         atime 1769745218.410248188 [  +0.000002] [T11703]         ctime 1769745218.410248188 [  +0.000002] [T11703]         mtime 1769745218.410248188 [  +0.000002] [T11703]         otime 1769745218.410248188 [  +0.000002] [T11703]     item 13 key (387 INODE_REF 324) itemoff 15708 itemsize 13 [  +0.000002] [T11703]         index 13 name_len 3 [  +0.000002] [T11703]     item 14 key (389 INODE_ITEM 0) itemoff 15548 itemsize 160 [  +0.000002] [T11703]         inode generation 25 transid 33 size 375425 nbytes 8192 [  +0.000003] [T11703]         block group 0 mode 100666 links 1 uid 0 gid 0 [  +0.000002] [T11703]         rdev 0 sequence 4 flags 0x0 [  +0.000001] [T11703]         atime 1769745218.410248188 [  +0.000002] [T11703]         ctime 1769745218.662385845 [  +0.000002] [T11703]         mtime 1769745218.662385845 [  +0.000001] [T11703]         otime 1769745218.410248188 [  +0.000002] [T11703]     item 15 key (389 INODE_REF 334) itemoff 15535 itemsize 13 [  +0.000002] [T11703]         index 7 name_len 3 [  +0.000002] [T11703]     item 16 key (389 XATTR_ITEM 1939513822) itemoff 15435 itemsize 100 [  +0.000003] [T11703]         location key (0 0 0) type 8 [  +0.000002] [T11703]         transid 33 data_len 63 name_len 7 [  +0.000002] [T11703]     item 17 key (389 EXTENT_DATA 368640) itemoff 15382 itemsize 53 [  +0.000002] [T11703]         generation 31 type 1 [  +0.000002] [T11703]         extent data disk bytenr 17526784 nr 8192 [  +0.000002] [T11703]         extent data offset 0 nr 4096 ram 8192 [  +0.000002] [T11703]         extent compression 0 [  +0.000002] [T11703]     item 18 key (389 EXTENT_DATA 372736) itemoff 15329 itemsize 53 [  +0.000002] [T11703]         generation 33 type 1 [  +0.000001] [T11703]         extent data disk bytenr 14102528 nr 4096 [  +0.000002] [T11703]         extent data offset 0 nr 4096 ram 4096 [  +0.000002] [T11703]         extent compression 0 [  +0.000001] [T11703]     item 19 key (389 EXTENT_DATA 1179648) itemoff 15276 itemsize 53 [  +0.000002] [T11703]         generation 33 type 1 [  +0.000002] [T11703]         extent data disk bytenr 370638848 nr 28672 [  +0.000002] [T11703]         extent data offset 0 nr 28672 ram 28672 [  +0.000002] [T11703]         extent compression 0 [  +0.000001] [T11703]     item 20 key (390 INODE_ITEM 0) itemoff 15116 itemsize 160 [  +0.000002] [T11703]         inode generation 25 transid 33 size 0 nbytes 0 [  +0.000002] [T11703]         block group 0 mode 20444 links 2 uid 0 gid 0 [  +0.000002] [T11703]         rdev 0 sequence 3 flags 0x0 [  +0.000002] [T11703]         atime 1769745218.414620392 [  +0.000002] [T11703]         ctime 1769745218.892384583 [  +0.000001] [T11703]         mtime 1769745218.414620392 [  +0.000002] [T11703]         otime 1769745218.414620392 [  +0.000002] [T11703]     item 21 key (390 INODE_REF 300) itemoff 15103 itemsize 13 [  +0.000002] [T11703]         index 13 name_len 3 [  +0.000002] [T11703]     item 22 key (390 INODE_REF 327) itemoff 15089 itemsize 14 [  +0.000002] [T11703]         index 17 name_len 4 [  +0.000001] [T11703]     item 23 key (391 INODE_ITEM 0) itemoff 14929 itemsize 160 [  +0.000003] [T11703]         inode generation 25 transid 30 size 12 nbytes 0 [  +0.000002] [T11703]         block group 0 mode 40777 links 1 uid 0 gid 0 [  +0.000002] [T11703]         rdev 0 sequence 3 flags 0x0 [  +0.000001] [T11703]         atime 1769745218.414620392 [  +0.000002] [T11703]         ctime 1769745218.609052805 [  +0.000002] [T11703]         mtime 1769745218.609052805 [  +0.000001] [T11703]         otime 1769745218.414620392 [  +0.000002] [T11703]     item 24 key (391 INODE_REF 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itemsize 160 [  +0.000003] [T11703]         inode generation 25 transid 25 size 0 nbytes 0 [  +0.000001] [T11703]         block group 0 mode 20444 links 1 uid 0 gid 0 [  +0.000002] [T11703]         rdev 0 sequence 2 flags 0x0 [  +0.000002] [T11703]         atime 1769745218.425720477 [  +0.000002] [T11703]         ctime 1769745218.429053792 [  +0.000001] [T11703]         mtime 1769745218.425720477 [  +0.000002] [T11703]         otime 1769745218.425720477 [  +0.000002] [T11703]     item 30 key (392 INODE_REF 391) itemoff 14611 itemsize 13 [  +0.000002] [T11703]         index 2 name_len 3 [  +0.000001] [T11703]     item 31 key (393 INODE_ITEM 0) itemoff 14451 itemsize 160 [  +0.000003] [T11703]         inode generation 25 transid 25 size 0 nbytes 0 [  +0.000001] [T11703]         block group 0 mode 20000 links 1 uid 0 gid 0 [  +0.000002] [T11703]         rdev 0 sequence 19 flags 0x0 [  +0.000002] [T11703]         atime 1769745218.429053792 [  +0.000002] [T11703]         ctime 1769745218.429053792 [  +0.000001] [T11703]         mtime 1769745218.429053792 [  +0.000002] [T11703]         otime 1769745218.429053792 [  +0.000002] [T11703]     item 32 key (393 INODE_REF 377) itemoff 14438 itemsize 13 [  +0.000002] [T11703]         index 4 name_len 3 [  +0.000002] [T11703]     item 33 key (394 INODE_ITEM 0) itemoff 14278 itemsize 160 [  +0.000023] [T11703]         inode generation 25 transid 29 size 0 nbytes 0 [  +0.000002] [T11703]         block group 0 mode 20444 links 1 uid 116392077 gid 49956004 [  +0.000002] [T11703]         rdev 0 sequence 20 flags 0x0 [  +0.000017] [T11703]         atime 1769745218.435720422 [  +0.000005] [T11703]         ctime 1769745218.575719654 [  +0.000002] [T11703]         mtime 1769745218.435720422 [  +0.000002] [T11703]         otime 1769745218.435720422 [  +0.000002] [T11703]     item 34 key (394 INODE_REF 336) itemoff 14265 itemsize 13 [  +0.000003] [T11703]         index 11 name_len 3 [  +0.000002] [T11703]     item 35 key (395 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25 transid 32 size 3371008 nbytes 757760 [  +0.000002] [T11703]         block group 0 mode 100666 links 1 uid 0 gid 0 [  +0.000002] [T11703]         rdev 0 sequence 40 flags 0x10 [  +0.000002] [T11703]         atime 1769745218.436974912 [  +0.000002] [T11703]         ctime 1769745218.732385461 [  +0.000001] [T11703]         mtime 1769745218.732385461 [  +0.000002] [T11703]         otime 1769745218.436974912 [  +0.000002] [T11703]     item 52 key (397 INODE_REF 344) itemoff 13188 itemsize 13 [  +0.000002] [T11703]         index 5 name_len 3 [  +0.000002] [T11703]     item 53 key (397 EXTENT_DATA 204800) itemoff 13135 itemsize 53 [  +0.000002] [T11703]         generation 14 type 2 [  +0.000002] [T11703]         extent data disk bytenr 135266304 nr 954368 [  +0.000001] [T11703]         extent data offset 421888 nr 8192 ram 954368 [  +0.000002] [T11703]         extent compression 0 [  +0.000002] [T11703]     item 54 key (397 EXTENT_DATA 253952) itemoff 13082 itemsize 53 [  +0.000002] [T11703]         generation 14 type 2 [  +0.000001] [T11703]         extent data disk bytenr 135266304 nr 954368 [  +0.000002] [T11703]         extent data offset 471040 nr 28672 ram 954368 [  +0.000002] [T11703]         extent compression 0 [  +0.000001] [T11703]     item 55 key (397 EXTENT_DATA 507904) itemoff 13029 itemsize 53 [  +0.000003] [T11703]         generation 31 type 1 [  +0.000001] [T11703]         extent data disk bytenr 17121280 nr 49152 [  +0.000002] [T11703]         extent data offset 0 nr 40960 ram 49152 [  +0.000001] [T11703]         extent compression 0 [  +0.000002] [T11703]     item 56 key (397 EXTENT_DATA 643072) itemoff 12976 itemsize 53 [  +0.000002] [T11703]         generation 27 type 1 [  +0.000002] [T11703]         extent data disk bytenr 362475520 nr 77824 [  +0.000001] [T11703]         extent data offset 0 nr 57344 ram 77824 [  +0.000002] [T11703]         extent compression 0 [  +0.000001] [T11703]     item 57 key (397 EXTENT_DATA 700416) itemoff 12923 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key (397 EXTENT_DATA 2244608) itemoff 12605 itemsize 53 [  +0.000002] [T11703]         generation 33 type 1 [  +0.000001] [T11703]         extent data disk bytenr 366755840 nr 102400 [  +0.000001] [T11703]         extent data offset 0 nr 102400 ram 102400 [  +0.000002] [T11703]         extent compression 0 [  +0.000001] [T11703]     item 64 key (397 EXTENT_DATA 2990080) itemoff 12552 itemsize 53 [  +0.000001] [T11703]         generation 32 type 2 [  +0.000001] [T11703]         extent data disk bytenr 153870336 nr 585728 [  +0.000002] [T11703]         extent data offset 16384 nr 172032 ram 585728 [  +0.000001] [T11703]         extent compression 0 [  +0.000001] [T11703]     item 65 key (397 EXTENT_DATA 3162112) itemoff 12499 itemsize 53 [  +0.000002] [T11703]         generation 32 type 1 [  +0.000001] [T11703]         extent data disk bytenr 153870336 nr 585728 [  +0.000001] [T11703]         extent data offset 188416 nr 110592 ram 585728 [  +0.000001] [T11703]         extent compression 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+0.000001] [T11703]         atime 1769745218.436974912 [  +0.000002] [T11703]         ctime 1769745218.522719547 [  +0.000001] [T11703]         mtime 1769745218.522719547 [  +0.000001] [T11703]         otime 1769745218.436974912 [  +0.000001] [T11703]     item 69 key (398 INODE_REF 369) itemoff 12220 itemsize 13 [  +0.000002] [T11703]         index 4 name_len 3 [  +0.000001] [T11703]     item 70 key (398 EXTENT_DATA 40960) itemoff 12167 itemsize 53 [  +0.000002] [T11703]         generation 14 type 2 [  +0.000001] [T11703]         extent data disk bytenr 135266304 nr 954368 [  +0.000001] [T11703]         extent data offset 421888 nr 8192 ram 954368 [  +0.000002] [T11703]         extent compression 0 [  +0.000001] [T11703]     item 71 key (398 EXTENT_DATA 90112) itemoff 12114 itemsize 53 [  +0.000002] [T11703]         generation 14 type 2 [  +0.000001] [T11703]         extent data disk bytenr 135266304 nr 954368 [  +0.000001] [T11703]         extent data offset 471040 nr 28672 ram 954368 [  +0.000001] [T11703]         extent compression 0 [  +0.000001] [T11703]     item 72 key (398 EXTENT_DATA 344064) itemoff 12061 itemsize 53 [  +0.000002] [T11703]         generation 14 type 2 [  +0.000001] [T11703]         extent data disk bytenr 135266304 nr 954368 [  +0.000001] [T11703]         extent data offset 421888 nr 8192 ram 954368 [  +0.000002] [T11703]         extent compression 0 [  +0.000001] [T11703]     item 73 key (398 EXTENT_DATA 393216) itemoff 12008 itemsize 53 [  +0.000002] [T11703]         generation 14 type 2 [  +0.000001] [T11703]         extent data disk bytenr 135266304 nr 954368 [  +0.000001] [T11703]         extent data offset 471040 nr 28672 ram 954368 [  +0.000001] [T11703]         extent compression 0 [  +0.000001] [T11703]     item 74 key (398 EXTENT_DATA 753664) itemoff 11955 itemsize 53 [  +0.000002] [T11703]         generation 27 type 1 [  +0.000001] [T11703]         extent data disk bytenr 21372928 nr 16384 [  +0.000001] [T11703]         extent data offset 0 nr 16384 ram 16384 [  +0.000001] [T11703]         extent compression 0 [  +0.000001] [T11703]     item 75 key (398 EXTENT_DATA 806912) itemoff 11902 itemsize 53 [  +0.000002] [T11703]         generation 33 type 1 [  +0.000001] [T11703]         extent data disk bytenr 366972928 nr 102400 [  +0.000001] [T11703]         extent data offset 0 nr 102400 ram 102400 [  +0.000002] [T11703]         extent compression 0 [  +0.000001] [T11703]     item 76 key (398 EXTENT_DATA 962560) itemoff 11849 itemsize 53 [  +0.000001] [T11703]         generation 31 type 1 [  +0.000001] [T11703]         extent data disk bytenr 17121280 nr 49152 [  +0.000002] [T11703]         extent data offset 0 nr 40960 ram 49152 [  +0.000001] [T11703]         extent compression 0 [  +0.000001] [T11703]     item 77 key (398 EXTENT_DATA 1343488) itemoff 11796 itemsize 53 [  +0.000002] [T11703]         generation 31 type 1 [  +0.000001] [T11703]         extent data disk bytenr 17121280 nr 49152 [  +0.000001] [T11703]         extent data offset 8192 nr 32768 ram 49152 [  +0.000001] [T11703]         extent compression 0 [  +0.000001] [T11703]     item 78 key (398 EXTENT_DATA 1388544) itemoff 11743 itemsize 53 [  +0.000002] [T11703]         generation 33 type 1 [  +0.000001] [T11703]         extent data disk bytenr 14479360 nr 4096 [  +0.000001] [T11703]         extent data offset 0 nr 4096 ram 4096 [  +0.000002] [T11703]         extent compression 0 [  +0.000001] [T11703]     item 79 key (399 INODE_ITEM 0) itemoff 11583 itemsize 160 [  +0.000001] [T11703]         inode generation 25 transid 32 size 585093 nbytes 339968 [  +0.000002] [T11703]         block group 0 mode 100666 links 1 uid 0 gid 0 [  +0.000001] [T11703]         rdev 0 sequence 31 flags 0x10 [  +0.000001] [T11703]         atime 1769745218.552386449 [  +0.000002] [T11703]         ctime 1769745218.649404376 [  +0.000001] [T11703]         mtime 1769745218.649404376 [  +0.000001] [T11703]         otime 1769745218.438593902 [  +0.000002] [T11703]     item 80 key (399 INODE_REF 297) itemoff 11570 itemsize 13 [  +0.000001] [T11703]         index 14 name_len 3 [  +0.000002] [T11703]     item 81 key (399 EXTENT_DATA 49152) itemoff 11517 itemsize 53 [  +0.000001] [T11703]         generation 14 type 2 [  +0.000001] [T11703]         extent data disk bytenr 135266304 nr 954368 [  +0.000002] [T11703]         extent data offset 421888 nr 8192 ram 954368 [  +0.000001] [T11703]         extent compression 0 [  +0.000001] [T11703]     item 82 key (399 EXTENT_DATA 98304) itemoff 11464 itemsize 53 [  +0.000002] [T11703]         generation 14 type 2 [  +0.000001] [T11703]         extent data disk bytenr 135266304 nr 954368 [  +0.000001] [T11703]         extent data offset 471040 nr 28672 ram 954368 [  +0.000001] [T11703]         extent compression 0 [  +0.000001] [T11703]     item 83 key (399 EXTENT_DATA 163840) itemoff 11411 itemsize 53 [  +0.000002] [T11703]         generation 27 type 1 [  +0.000001] [T11703]         extent data disk bytenr 362151936 nr 45056 [  +0.000001] [T11703]         extent data offset 0 nr 45056 ram 45056 [  +0.000001] [T11703]         extent compression 0 [  +0.000001] [T11703]     item 84 key (399 EXTENT_DATA 229376) itemoff 11358 itemsize 53 [  +0.000002] [T11703]         generation 30 type 1 [  +0.000001] [T11703]         extent data disk bytenr 363864064 nr 98304 [  +0.000001] [T11703]         extent data offset 0 nr 98304 ram 98304 [  +0.000002] [T11703]         extent compression 0 [  +0.000001] [T11703]     item 85 key (399 EXTENT_DATA 335872) itemoff 11305 itemsize 53 [  +0.000001] [T11703]         generation 25 type 2 [  +0.000001] [T11703]         extent data disk bytenr 359723008 nr 94208 [  +0.000002] [T11703]         extent data offset 0 nr 4096 ram 94208 [  +0.000001] [T11703]         extent compression 0 [  +0.000001] [T11703]     item 86 key (399 EXTENT_DATA 344064) itemoff 11252 itemsize 53 [  +0.000002] [T11703]         generation 33 type 1 [  +0.000001] [T11703]         extent data disk bytenr 14061568 nr 4096 [  +0.000001] [T11703]         extent data offset 0 nr 4096 ram 4096 [  +0.000001] [T11703]         extent compression 0 [  +0.000001] [T11703]     item 87 key (399 EXTENT_DATA 356352) itemoff 11199 itemsize 53 [  +0.000002] [T11703]         generation 15 type 2 [  +0.000001] [T11703]         extent data disk bytenr 138276864 nr 282624 [  +0.000001] [T11703]         extent data offset 69632 nr 16384 ram 282624 [  +0.000001] [T11703]         extent compression 0 [  +0.000001] [T11703]     item 88 key (399 EXTENT_DATA 479232) itemoff 11146 itemsize 53 [  +0.000002] [T11703]         generation 31 type 1 [  +0.000001] [T11703]         extent data disk bytenr 17408000 nr 106496 [  +0.000001] [T11703]         extent data offset 0 nr 102400 ram 106496 [  +0.000002] [T11703]         extent compression 0 [  +0.000001] [T11703]     item 89 key (399 EXTENT_DATA 581632) itemoff 11093 itemsize 53 [  +0.000001] [T11703]         generation 33 type 1 [  +0.000002] [T11703]         extent data disk bytenr 13647872 nr 4096 [  +0.000001] [T11703]         extent data offset 0 nr 4096 ram 4096 [  +0.000001] [T11703]         extent compression 0 [  +0.000001] [T11703]     item 90 key (399 EXTENT_DATA 1445888) itemoff 11040 itemsize 53 [  +0.000002] [T11703]         generation 33 type 1 [  +0.000001] [T11703]         extent data disk bytenr 21803008 nr 32768 [  +0.000002] [T11703]         extent data offset 0 nr 28672 ram 32768 [  +0.000001] [T11703]         extent compression 0 [  +0.000001] [T11703]     item 91 key (399 EXTENT_DATA 1474560) itemoff 10987 itemsize 53 [  +0.000002] [T11703]         generation 33 type 1 [  +0.000001] [T11703]         extent data disk bytenr 13877248 nr 4096 [  +0.000001] [T11703]         extent data offset 0 nr 4096 ram 4096 [  +0.000001] [T11703]         extent compression 0 [  +0.000001] [T11703]     item 92 key (399 EXTENT_DATA 1892352) itemoff 10934 itemsize 53 [  +0.000002] [T11703]         generation 33 type 1 [  +0.000001] [T11703]         extent data disk bytenr 369930240 nr 65536 [  +0.000001] [T11703]         extent data offset 0 nr 65536 ram 65536 [  +0.000002] [T11703]         extent compression 0 [  +0.000001] [T11703]     item 93 key (400 INODE_ITEM 0) itemoff 10774 itemsize 160 [  +0.000001] [T11703]         inode generation 25 transid 30 size 0 nbytes 0 [  +0.000002] [T11703]         block group 0 mode 20444 links 1 uid 0 gid 0 [  +0.000001] [T11703]         rdev 0 sequence 23 flags 0x0 [  +0.000002] [T11703]         atime 1769745218.439782042 [  +0.000001] [T11703]         ctime 1769745218.632386010 [  +0.000001] [T11703]         mtime 1769745218.439782042 [  +0.000001] [T11703]         otime 1769745218.439782042 [  +0.000002] [T11703]     item 94 key (400 INODE_REF 272) itemoff 10761 itemsize 13 [  +0.000001] [T11703]         index 44 name_len 3 [  +0.000002] [T11703]     item 95 key (401 INODE_ITEM 0) itemoff 10601 itemsize 160 [  +0.000001] [T11703]         inode generation 25 transid 33 size 14 nbytes 0 [  +0.000002] [T11703]         block group 0 mode 40777 links 1 uid 0 gid 0 [  +0.000001] [T11703]         rdev 0 sequence 22 flags 0x0 [  +0.000001] [T11703]         atime 1769745218.444837643 [  +0.000002] [T11703]         ctime 1769745218.839051542 [  +0.000001] [T11703]         mtime 1769745218.839051542 [  +0.000001] [T11703]         otime 1769745218.444837643 [  +0.000002] [T11703]     item 96 key (401 INODE_REF 319) itemoff 10588 itemsize 13 [  +0.000001] [T11703]         index 10 name_len 3 [  +0.000001] [T11703]     item 97 key (401 DIR_ITEM 1191232959) itemoff 10554 itemsize 34 [  +0.000002] [T11703]         location key (459 1 0) type 3 [  +0.000002] [T11703]         transid 33 data_len 0 name_len 4 [  +0.000001] [T11703]     item 98 key (401 DIR_ITEM 3224377935) itemoff 10521 itemsize 33 [  +0.000002] [T11703]         location key (429 1 0) type 1 [  +0.000001] [T11703]         transid 30 data_len 0 name_len 3 [  +0.000001] [T11703]     item 99 key (401 DIR_INDEX 2) itemoff 10488 itemsize 33 [  +0.000002] [T11703]         location key (429 1 0) type 1 [  +0.000001] [T11703]         transid 30 data_len 0 name_len 3 [  +0.000002] [T11703]     item 100 key (401 DIR_INDEX 3) itemoff 10454 itemsize 34 [  +0.000001] [T11703]         location key (459 1 0) type 3 [  +0.000002] [T11703]         transid 33 data_len 0 name_len 4 [  +0.000001] [T11703]     item 101 key (402 INODE_ITEM 0) itemoff 10294 itemsize 160 [  +0.000002] [T11703]         inode generation 25 transid 30 size 0 nbytes 0 [  +0.000001] [T11703]         block group 0 mode 20000 links 1 uid 10 gid 25 [  +0.000002] [T11703]         rdev 0 sequence 20 flags 0x0 [  +0.000001] [T11703]         atime 1769745218.446861225 [  +0.000001] [T11703]         ctime 1769745218.609052805 [  +0.000002] [T11703]         mtime 1769745218.446861225 [  +0.000001] [T11703]         otime 1769745218.446861225 [  +0.000001] [T11703]     item 102 key (402 INODE_REF 336) itemoff 10281 itemsize 13 [  +0.000002] [T11703]         index 12 name_len 3 [  +0.000001] [T11703]     item 103 key (403 INODE_ITEM 0) itemoff 10121 itemsize 160 [  +0.000002] [T11703]         inode generation 25 transid 33 size 48 nbytes 0 [  +0.000001] [T11703]         block group 0 mode 40777 links 1 uid 0 gid 0 [  +0.000002] [T11703]         rdev 0 sequence 40 flags 0x0 [  +0.000001] [T11703]         atime 1769745218.446861225 [  +0.000001] [T11703]         ctime 1769745218.802385077 [  +0.000001] [T11703]         mtime 1769745218.802385077 [  +0.000002] [T11703]         otime 1769745218.446861225 [  +0.000001] [T11703]     item 104 key (403 INODE_REF 335) itemoff 10108 itemsize 13 [  +0.000002] [T11703]         index 8 name_len 3 [  +0.000001] [T11703]     item 105 key (403 DIR_ITEM 383218927) itemoff 10074 itemsize 34 [  +0.000002] [T11703]         location key (299 1 0) type 3 [  +0.000001] [T11703]         transid 33 data_len 0 name_len 4 [  +0.000001] [T11703]     item 106 key (403 DIR_ITEM 445930716) itemoff 10041 itemsize 33 [  +0.000002] [T11703]         location key (287 1 0) type 3 [  +0.000001] [T11703]         transid 30 data_len 0 name_len 3 [  +0.000002] [T11703]     item 107 key (403 DIR_ITEM 1238590424) itemoff 10008 itemsize 33 [  +0.000001] [T11703]         location key (418 1 0) type 2 [  +0.000002] [T11703]         transid 27 data_len 0 name_len 3 [  +0.000001] [T11703]     item 108 key (403 DIR_ITEM 1779809903) itemoff 9974 itemsize 34 [  +0.000002] [T11703]         location key (486 1 0) type 2 [  +0.000001] [T11703]         transid 33 data_len 0 name_len 4 [  +0.000001] [T11703]     item 109 key (403 DIR_ITEM 1827976929) itemoff 9941 itemsize 33 [  +0.000002] [T11703]         location key (263 1 0) type 3 [  +0.000002] [T11703]         transid 30 data_len 0 name_len 3 [  +0.000001] [T11703]     item 110 key (403 DIR_ITEM 2397436283) itemoff 9907 itemsize 34 [  +0.000002] [T11703]         location key (458 1 0) type 7 [  +0.000001] [T11703]         transid 33 data_len 0 name_len 4 [  +0.000001] [T11703]     item 111 key (403 DIR_ITEM 2479530324) itemoff 9873 itemsize 34 [  +0.000002] [T11703]         location key (457 1 0) type 3 [  +0.000001] [T11703]         transid 33 data_len 0 name_len 4 [  +0.000001] [T11703]     item 112 key (403 DIR_ITEM 3110495684) itemoff 9839 itemsize 34 [  +0.000002] [T11703]         location key (466 1 0) type 3 [  +0.000001] [T11703]         transid 33 data_len 0 name_len 4 [  +0.000002] [T11703]     item 113 key (403 DIR_ITEM 3884400930) itemoff 9806 itemsize 33 [  +0.000001] [T11703]         location key (416 1 0) type 1 [  +0.000002] [T11703]         transid 27 data_len 0 name_len 3 [  +0.000001] [T11703]     item 114 key (403 DIR_INDEX 4) itemoff 9773 itemsize 33 [  +0.000002] [T11703]         location key (416 1 0) type 1 [  +0.000001] [T11703]         transid 27 data_len 0 name_len 3 [  +0.000001] [T11703]     item 115 key (403 DIR_INDEX 5) itemoff 9740 itemsize 33 [  +0.000002] [T11703]         location key (418 1 0) type 2 [  +0.000001] [T11703]         transid 27 data_len 0 name_len 3 [  +0.000002] [T11703]     item 116 key (403 DIR_INDEX 7) itemoff 9707 itemsize 33 [  +0.000001] [T11703]         location key (287 1 0) type 3 [  +0.000002] [T11703]         transid 30 data_len 0 name_len 3 [  +0.000001] [T11703]     item 117 key (403 DIR_INDEX 8) itemoff 9674 itemsize 33 [  +0.000002] [T11703]         location key (263 1 0) type 3 [  +0.000001] [T11703]         transid 30 data_len 0 name_len 3 [  +0.000001] [T11703]     item 118 key (403 DIR_INDEX 10) itemoff 9640 itemsize 34 [  +0.000002] [T11703]         location key (299 1 0) type 3 [  +0.000001] [T11703]         transid 33 data_len 0 name_len 4 [  +0.000002] [T11703]     item 119 key (403 DIR_INDEX 11) itemoff 9606 itemsize 34 [  +0.000001] [T11703]         location key (457 1 0) type 3 [  +0.000002] [T11703]         transid 33 data_len 0 name_len 4 [  +0.000001] [T11703]     item 120 key (403 DIR_INDEX 12) itemoff 9572 itemsize 34 [  +0.000002] [T11703]         location key (458 1 0) type 7 [  +0.000001] [T11703]         transid 33 data_len 0 name_len 4 [  +0.000001] [T11703]     item 121 key (404 INODE_ITEM 0) itemoff 9412 itemsize 160 [  +0.000002] [T11703]         inode generation 27 transid 32 size 3080 nbytes 3080 [  +0.000001] [T11703]         block group 0 mode 120777 links 1 uid 0 gid 0 [  +0.000002] [T11703]         rdev 0 sequence 21 flags 0x0 [  +0.000001] [T11703]         atime 1769745218.505720038 [  +0.000001] [T11703]         ctime 1769745218.754448742 [  +0.000002] [T11703]         mtime 1769745218.505720038 [  +0.000001] [T11703]         otime 1769745218.505720038 [  +0.000001] [T11703]     item 122 key (404 INODE_REF 315) itemoff 9399 itemsize 13 [  +0.000002] [T11703]         index 19 name_len 3 [  +0.000001] [T11703]     item 123 key (404 EXTENT_DATA 0) itemoff 6298 itemsize 3101 [  +0.000002] [T11703]         generation 27 type 0 [  +0.000001] [T11703]         inline extent data size 3080 ram_bytes 3080 compression 0 [  +0.000002] [T11703]     item 124 key (405 INODE_ITEM 0) itemoff 6138 itemsize 160 [  +0.000001] [T11703]         inode generation 27 transid 30 size 20 nbytes 0 [  +0.000002] [T11703]         block group 0 mode 40777 links 1 uid 31 gid 901 [  +0.000002] [T11703]         rdev 0 sequence 26 flags 0x0 [  +0.000001] [T11703]         atime 1769745218.505720038 [  +0.000001] [T11703]         ctime 1769745218.662385845 [  +0.000001] [T11703]         mtime 1769745218.662385845 [  +0.000001] [T11703]         otime 1769745218.505720038 [  +0.000002] [T11703]     item 125 key (405 INODE_REF 327) itemoff 6125 itemsize 13 [  +0.000001] [T11703]         index 12 name_len 3 [  +0.000002] [T11703]     item 126 key (405 DIR_ITEM 695610317) itemoff 6091 itemsize 34 [  +0.000002] [T11703]         location key (435 1 0) type 2 [  +0.000001] [T11703]         transid 30 data_len 0 name_len 4 [  +0.000001] [T11703]     item 127 key (405 DIR_ITEM 828387202) itemoff 6057 itemsize 34 [  +0.000002] [T11703]         location key (479 1 0) type 3 [  +0.000001] [T11703]         transid 33 data_len 0 name_len 4 [  +0.000002] [T11703] BTRFS error (device loop1): block=36995072 write time tree block corruption detected [  +0.003429] [T11703] BTRFS: error (device loop1) in btrfs_commit_transaction:2555: errno=-5 IO failure (Error while writing out transaction) [  +0.000007] [T11703] BTRFS info (device loop1 state E): forced readonly [  +0.000002] [T11703] BTRFS warning (device loop1 state E): Skipping commit of aborted transaction. [  +0.000002] [T11703] BTRFS error (device loop1 state EA): Transaction aborted (error -5) [  +0.000003] [T11703] BTRFS: error (device loop1 state EA) in cleanup_transaction:2037: errno=-5 IO failure The reported 406 inode is even not in the printed leaf. It seems like a data race maybe caused by: We unlock the eb after setting the WRITTEN flag during write back, and the eb should not get modified since then because all future writes will use the cowed eb. However, with the WRITTEN flag check removed in should_cow_block, we might write to the eb with WRITTEN flag set which might be under io. To fix this, we need to check the DIRTY flag again to prevent writing a eb which has some new data written, and lock the eb before we really doing io related things. I'm not farmilar with io related code so please correct me if I got anything wrong. Thanks, Sun Yangkai