CVE-2023-54224 (GCVE-0-2023-54224)
Vulnerability from cvelistv5 – Published: 2025-12-30 12:11 – Updated: 2025-12-30 12:11
VLAI?
Title
btrfs: fix lockdep splat and potential deadlock after failure running delayed items
Summary
In the Linux kernel, the following vulnerability has been resolved:
btrfs: fix lockdep splat and potential deadlock after failure running delayed items
When running delayed items we are holding a delayed node's mutex and then
we will attempt to modify a subvolume btree to insert/update/delete the
delayed items. However if have an error during the insertions for example,
btrfs_insert_delayed_items() may return with a path that has locked extent
buffers (a leaf at the very least), and then we attempt to release the
delayed node at __btrfs_run_delayed_items(), which requires taking the
delayed node's mutex, causing an ABBA type of deadlock. This was reported
by syzbot and the lockdep splat is the following:
WARNING: possible circular locking dependency detected
6.5.0-rc7-syzkaller-00024-g93f5de5f648d #0 Not tainted
------------------------------------------------------
syz-executor.2/13257 is trying to acquire lock:
ffff88801835c0c0 (&delayed_node->mutex){+.+.}-{3:3}, at: __btrfs_release_delayed_node+0x9a/0xaa0 fs/btrfs/delayed-inode.c:256
but task is already holding lock:
ffff88802a5ab8e8 (btrfs-tree-00){++++}-{3:3}, at: __btrfs_tree_lock+0x3c/0x2a0 fs/btrfs/locking.c:198
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (btrfs-tree-00){++++}-{3:3}:
__lock_release kernel/locking/lockdep.c:5475 [inline]
lock_release+0x36f/0x9d0 kernel/locking/lockdep.c:5781
up_write+0x79/0x580 kernel/locking/rwsem.c:1625
btrfs_tree_unlock_rw fs/btrfs/locking.h:189 [inline]
btrfs_unlock_up_safe+0x179/0x3b0 fs/btrfs/locking.c:239
search_leaf fs/btrfs/ctree.c:1986 [inline]
btrfs_search_slot+0x2511/0x2f80 fs/btrfs/ctree.c:2230
btrfs_insert_empty_items+0x9c/0x180 fs/btrfs/ctree.c:4376
btrfs_insert_delayed_item fs/btrfs/delayed-inode.c:746 [inline]
btrfs_insert_delayed_items fs/btrfs/delayed-inode.c:824 [inline]
__btrfs_commit_inode_delayed_items+0xd24/0x2410 fs/btrfs/delayed-inode.c:1111
__btrfs_run_delayed_items+0x1db/0x430 fs/btrfs/delayed-inode.c:1153
flush_space+0x269/0xe70 fs/btrfs/space-info.c:723
btrfs_async_reclaim_metadata_space+0x106/0x350 fs/btrfs/space-info.c:1078
process_one_work+0x92c/0x12c0 kernel/workqueue.c:2600
worker_thread+0xa63/0x1210 kernel/workqueue.c:2751
kthread+0x2b8/0x350 kernel/kthread.c:389
ret_from_fork+0x2e/0x60 arch/x86/kernel/process.c:145
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
-> #0 (&delayed_node->mutex){+.+.}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3142 [inline]
check_prevs_add kernel/locking/lockdep.c:3261 [inline]
validate_chain kernel/locking/lockdep.c:3876 [inline]
__lock_acquire+0x39ff/0x7f70 kernel/locking/lockdep.c:5144
lock_acquire+0x1e3/0x520 kernel/locking/lockdep.c:5761
__mutex_lock_common+0x1d8/0x2530 kernel/locking/mutex.c:603
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:799
__btrfs_release_delayed_node+0x9a/0xaa0 fs/btrfs/delayed-inode.c:256
btrfs_release_delayed_node fs/btrfs/delayed-inode.c:281 [inline]
__btrfs_run_delayed_items+0x2b5/0x430 fs/btrfs/delayed-inode.c:1156
btrfs_commit_transaction+0x859/0x2ff0 fs/btrfs/transaction.c:2276
btrfs_sync_file+0xf56/0x1330 fs/btrfs/file.c:1988
vfs_fsync_range fs/sync.c:188 [inline]
vfs_fsync fs/sync.c:202 [inline]
do_fsync fs/sync.c:212 [inline]
__do_sys_fsync fs/sync.c:220 [inline]
__se_sys_fsync fs/sync.c:218 [inline]
__x64_sys_fsync+0x196/0x1e0 fs/sync.c:218
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
other info that
---truncated---
Severity ?
No CVSS data available.
Assigner
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux |
Affected:
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 50abe4b37f58a25214b732212926d35e6fabd6c3
(git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 126d5a99e583e2d387ee4ea7b796c8fec4483244 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a70c6e57316b677c83e0e53569c555057b5813c4 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 3d379dd109f80c8f3b9aaa2d15681b37803aa4c0 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 779c3cf2749c7a7bad6f839cb2954a25ba92f4d6 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 32247b9526bfdaeef85f7339d9b4f913c7370f92 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 36d918da3f1bf749178c7daf471a3be1730ed3ca (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e110f8911ddb93e6f55da14ccbbe705397b30d0b (git) |
|||||||
|
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{
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix lockdep splat and potential deadlock after failure running delayed items\n\nWhen running delayed items we are holding a delayed node\u0027s mutex and then\nwe will attempt to modify a subvolume btree to insert/update/delete the\ndelayed items. However if have an error during the insertions for example,\nbtrfs_insert_delayed_items() may return with a path that has locked extent\nbuffers (a leaf at the very least), and then we attempt to release the\ndelayed node at __btrfs_run_delayed_items(), which requires taking the\ndelayed node\u0027s mutex, causing an ABBA type of deadlock. This was reported\nby syzbot and the lockdep splat is the following:\n\n WARNING: possible circular locking dependency detected\n 6.5.0-rc7-syzkaller-00024-g93f5de5f648d #0 Not tainted\n ------------------------------------------------------\n syz-executor.2/13257 is trying to acquire lock:\n ffff88801835c0c0 (\u0026delayed_node-\u003emutex){+.+.}-{3:3}, at: __btrfs_release_delayed_node+0x9a/0xaa0 fs/btrfs/delayed-inode.c:256\n\n but task is already holding lock:\n ffff88802a5ab8e8 (btrfs-tree-00){++++}-{3:3}, at: __btrfs_tree_lock+0x3c/0x2a0 fs/btrfs/locking.c:198\n\n which lock already depends on the new lock.\n\n the existing dependency chain (in reverse order) is:\n\n -\u003e #1 (btrfs-tree-00){++++}-{3:3}:\n __lock_release kernel/locking/lockdep.c:5475 [inline]\n lock_release+0x36f/0x9d0 kernel/locking/lockdep.c:5781\n up_write+0x79/0x580 kernel/locking/rwsem.c:1625\n btrfs_tree_unlock_rw fs/btrfs/locking.h:189 [inline]\n btrfs_unlock_up_safe+0x179/0x3b0 fs/btrfs/locking.c:239\n search_leaf fs/btrfs/ctree.c:1986 [inline]\n btrfs_search_slot+0x2511/0x2f80 fs/btrfs/ctree.c:2230\n btrfs_insert_empty_items+0x9c/0x180 fs/btrfs/ctree.c:4376\n btrfs_insert_delayed_item fs/btrfs/delayed-inode.c:746 [inline]\n btrfs_insert_delayed_items fs/btrfs/delayed-inode.c:824 [inline]\n __btrfs_commit_inode_delayed_items+0xd24/0x2410 fs/btrfs/delayed-inode.c:1111\n __btrfs_run_delayed_items+0x1db/0x430 fs/btrfs/delayed-inode.c:1153\n flush_space+0x269/0xe70 fs/btrfs/space-info.c:723\n btrfs_async_reclaim_metadata_space+0x106/0x350 fs/btrfs/space-info.c:1078\n process_one_work+0x92c/0x12c0 kernel/workqueue.c:2600\n worker_thread+0xa63/0x1210 kernel/workqueue.c:2751\n kthread+0x2b8/0x350 kernel/kthread.c:389\n ret_from_fork+0x2e/0x60 arch/x86/kernel/process.c:145\n ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304\n\n -\u003e #0 (\u0026delayed_node-\u003emutex){+.+.}-{3:3}:\n check_prev_add kernel/locking/lockdep.c:3142 [inline]\n check_prevs_add kernel/locking/lockdep.c:3261 [inline]\n validate_chain kernel/locking/lockdep.c:3876 [inline]\n __lock_acquire+0x39ff/0x7f70 kernel/locking/lockdep.c:5144\n lock_acquire+0x1e3/0x520 kernel/locking/lockdep.c:5761\n __mutex_lock_common+0x1d8/0x2530 kernel/locking/mutex.c:603\n __mutex_lock kernel/locking/mutex.c:747 [inline]\n mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:799\n __btrfs_release_delayed_node+0x9a/0xaa0 fs/btrfs/delayed-inode.c:256\n btrfs_release_delayed_node fs/btrfs/delayed-inode.c:281 [inline]\n __btrfs_run_delayed_items+0x2b5/0x430 fs/btrfs/delayed-inode.c:1156\n btrfs_commit_transaction+0x859/0x2ff0 fs/btrfs/transaction.c:2276\n btrfs_sync_file+0xf56/0x1330 fs/btrfs/file.c:1988\n vfs_fsync_range fs/sync.c:188 [inline]\n vfs_fsync fs/sync.c:202 [inline]\n do_fsync fs/sync.c:212 [inline]\n __do_sys_fsync fs/sync.c:220 [inline]\n __se_sys_fsync fs/sync.c:218 [inline]\n __x64_sys_fsync+0x196/0x1e0 fs/sync.c:218\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\n other info that\n---truncated---"
}
],
"providerMetadata": {
"dateUpdated": "2025-12-30T12:11:18.076Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/50abe4b37f58a25214b732212926d35e6fabd6c3"
},
{
"url": "https://git.kernel.org/stable/c/126d5a99e583e2d387ee4ea7b796c8fec4483244"
},
{
"url": "https://git.kernel.org/stable/c/a70c6e57316b677c83e0e53569c555057b5813c4"
},
{
"url": "https://git.kernel.org/stable/c/3d379dd109f80c8f3b9aaa2d15681b37803aa4c0"
},
{
"url": "https://git.kernel.org/stable/c/779c3cf2749c7a7bad6f839cb2954a25ba92f4d6"
},
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},
{
"url": "https://git.kernel.org/stable/c/e110f8911ddb93e6f55da14ccbbe705397b30d0b"
}
],
"title": "btrfs: fix lockdep splat and potential deadlock after failure running delayed items",
"x_generator": {
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}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2023-54224",
"datePublished": "2025-12-30T12:11:18.076Z",
"dateReserved": "2025-12-30T12:06:44.501Z",
"dateUpdated": "2025-12-30T12:11:18.076Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2023-54224\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-30T13:16:10.743\",\"lastModified\":\"2025-12-31T20:42:43.210\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbtrfs: fix lockdep splat and potential deadlock after failure running delayed items\\n\\nWhen running delayed items we are holding a delayed node\u0027s mutex and then\\nwe will attempt to modify a subvolume btree to insert/update/delete the\\ndelayed items. However if have an error during the insertions for example,\\nbtrfs_insert_delayed_items() may return with a path that has locked extent\\nbuffers (a leaf at the very least), and then we attempt to release the\\ndelayed node at __btrfs_run_delayed_items(), which requires taking the\\ndelayed node\u0027s mutex, causing an ABBA type of deadlock. This was reported\\nby syzbot and the lockdep splat is the following:\\n\\n WARNING: possible circular locking dependency detected\\n 6.5.0-rc7-syzkaller-00024-g93f5de5f648d #0 Not tainted\\n ------------------------------------------------------\\n syz-executor.2/13257 is trying to acquire lock:\\n ffff88801835c0c0 (\u0026delayed_node-\u003emutex){+.+.}-{3:3}, at: __btrfs_release_delayed_node+0x9a/0xaa0 fs/btrfs/delayed-inode.c:256\\n\\n but task is already holding lock:\\n ffff88802a5ab8e8 (btrfs-tree-00){++++}-{3:3}, at: __btrfs_tree_lock+0x3c/0x2a0 fs/btrfs/locking.c:198\\n\\n which lock already depends on the new lock.\\n\\n the existing dependency chain (in reverse order) is:\\n\\n -\u003e #1 (btrfs-tree-00){++++}-{3:3}:\\n __lock_release kernel/locking/lockdep.c:5475 [inline]\\n lock_release+0x36f/0x9d0 kernel/locking/lockdep.c:5781\\n up_write+0x79/0x580 kernel/locking/rwsem.c:1625\\n btrfs_tree_unlock_rw fs/btrfs/locking.h:189 [inline]\\n btrfs_unlock_up_safe+0x179/0x3b0 fs/btrfs/locking.c:239\\n search_leaf fs/btrfs/ctree.c:1986 [inline]\\n btrfs_search_slot+0x2511/0x2f80 fs/btrfs/ctree.c:2230\\n btrfs_insert_empty_items+0x9c/0x180 fs/btrfs/ctree.c:4376\\n btrfs_insert_delayed_item fs/btrfs/delayed-inode.c:746 [inline]\\n btrfs_insert_delayed_items fs/btrfs/delayed-inode.c:824 [inline]\\n __btrfs_commit_inode_delayed_items+0xd24/0x2410 fs/btrfs/delayed-inode.c:1111\\n __btrfs_run_delayed_items+0x1db/0x430 fs/btrfs/delayed-inode.c:1153\\n flush_space+0x269/0xe70 fs/btrfs/space-info.c:723\\n btrfs_async_reclaim_metadata_space+0x106/0x350 fs/btrfs/space-info.c:1078\\n process_one_work+0x92c/0x12c0 kernel/workqueue.c:2600\\n worker_thread+0xa63/0x1210 kernel/workqueue.c:2751\\n kthread+0x2b8/0x350 kernel/kthread.c:389\\n ret_from_fork+0x2e/0x60 arch/x86/kernel/process.c:145\\n ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304\\n\\n -\u003e #0 (\u0026delayed_node-\u003emutex){+.+.}-{3:3}:\\n check_prev_add kernel/locking/lockdep.c:3142 [inline]\\n check_prevs_add kernel/locking/lockdep.c:3261 [inline]\\n validate_chain kernel/locking/lockdep.c:3876 [inline]\\n __lock_acquire+0x39ff/0x7f70 kernel/locking/lockdep.c:5144\\n lock_acquire+0x1e3/0x520 kernel/locking/lockdep.c:5761\\n __mutex_lock_common+0x1d8/0x2530 kernel/locking/mutex.c:603\\n __mutex_lock kernel/locking/mutex.c:747 [inline]\\n mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:799\\n __btrfs_release_delayed_node+0x9a/0xaa0 fs/btrfs/delayed-inode.c:256\\n btrfs_release_delayed_node fs/btrfs/delayed-inode.c:281 [inline]\\n __btrfs_run_delayed_items+0x2b5/0x430 fs/btrfs/delayed-inode.c:1156\\n btrfs_commit_transaction+0x859/0x2ff0 fs/btrfs/transaction.c:2276\\n btrfs_sync_file+0xf56/0x1330 fs/btrfs/file.c:1988\\n vfs_fsync_range fs/sync.c:188 [inline]\\n vfs_fsync fs/sync.c:202 [inline]\\n do_fsync fs/sync.c:212 [inline]\\n __do_sys_fsync fs/sync.c:220 [inline]\\n __se_sys_fsync fs/sync.c:218 [inline]\\n __x64_sys_fsync+0x196/0x1e0 fs/sync.c:218\\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\\n do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80\\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\\n\\n other info that\\n---truncated---\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/126d5a99e583e2d387ee4ea7b796c8fec4483244\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/32247b9526bfdaeef85f7339d9b4f913c7370f92\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/36d918da3f1bf749178c7daf471a3be1730ed3ca\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3d379dd109f80c8f3b9aaa2d15681b37803aa4c0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/50abe4b37f58a25214b732212926d35e6fabd6c3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/779c3cf2749c7a7bad6f839cb2954a25ba92f4d6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a70c6e57316b677c83e0e53569c555057b5813c4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e110f8911ddb93e6f55da14ccbbe705397b30d0b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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