{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-71194",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-71194"
  ],
  "published": "2026-02-04T16:05:00Z",
  "summary": "btrfs: fix deadlock in wait_current_trans() due to ignored transaction type",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix deadlock in wait_current_trans() due to ignored transaction type\n\nWhen wait_current_trans() is called during start_transaction(), it\ncurrently waits for a blocked transaction without considering whether\nthe given transaction type actually needs to wait for that particular\ntransaction state. The btrfs_blocked_trans_types[] array already defines\nwhich transaction types should wait for which transaction states, but\nthis check was missing in wait_current_trans().\n\nThis can lead to a deadlock scenario involving two transactions and\npending ordered extents:\n\n  1. Transaction A is in TRANS_STATE_COMMIT_DOING state\n\n  2. A worker processing an ordered extent calls start_transaction()\n     with TRANS_JOIN\n\n  3. join_transaction() returns -EBUSY because Transaction A is in\n     TRANS_STATE_COMMIT_DOING\n\n  4. Transaction A moves to TRANS_STATE_UNBLOCKED and completes\n\n  5. A new Transaction B is created (TRANS_STATE_RUNNING)\n\n  6. The ordered extent from step 2 is added to Transaction B's\n     pending ordered extents\n\n  7. Transaction B immediately starts commit by another task and\n     enters TRANS_STATE_COMMIT_START\n\n  8. The worker finally reaches wait_current_trans(), sees Transaction B\n     in TRANS_STATE_COMMIT_START (a blocked state), and waits\n     unconditionally\n\n  9. However, TRANS_JOIN should NOT wait for TRANS_STATE_COMMIT_START\n     according to btrfs_blocked_trans_types[]\n\n  10. Transaction B is waiting for pending ordered extents to complete\n\n  11. Deadlock: Transaction B waits for ordered extent, ordered extent\n      waits for Transaction B\n\nThis can be illustrated by the following call stacks:\n  CPU0                              CPU1\n                                    btrfs_finish_ordered_io()\n                                      start_transaction(TRANS_JOIN)\n                                        join_transaction()\n                                          # -EBUSY (Transaction A is\n                                          # TRANS_STATE_COMMIT_DOING)\n  # Transaction A completes\n  # Transaction B created\n  # ordered extent added to\n  # Transaction B's pending list\n  btrfs_commit_transaction()\n    # Transaction B enters\n    # TRANS_STATE_COMMIT_START\n    # waiting for pending ordered\n    # extents\n                                        wait_current_trans()\n                                          # waits for Transaction B\n                                          # (should not wait!)\n\nTask bstore_kv_sync in btrfs_commit_transaction waiting for ordered\nextents:\n\n  __schedule+0x2e7/0x8a0\n  schedule+0x64/0xe0\n  btrfs_commit_transaction+0xbf7/0xda0 [btrfs]\n  btrfs_sync_file+0x342/0x4d0 [btrfs]\n  __x64_sys_fdatasync+0x4b/0x80\n  do_syscall_64+0x33/0x40\n  entry_SYSCALL_64_after_hwframe+0x44/0xa9\n\nTask kworker in wait_current_trans waiting for transaction commit:\n\n  Workqueue: btrfs-syno_nocow btrfs_work_helper [btrfs]\n  __schedule+0x2e7/0x8a0\n  schedule+0x64/0xe0\n  wait_current_trans+0xb0/0x110 [btrfs]\n  start_transaction+0x346/0x5b0 [btrfs]\n  btrfs_finish_ordered_io.isra.0+0x49b/0x9c0 [btrfs]\n  btrfs_work_helper+0xe8/0x350 [btrfs]\n  process_one_work+0x1d3/0x3c0\n  worker_thread+0x4d/0x3e0\n  kthread+0x12d/0x150\n  ret_from_fork+0x1f/0x30\n\nFix this by passing the transaction type to wait_current_trans() and\nchecking btrfs_blocked_trans_types[cur_trans->state] against the given\ntype before deciding to wait. This ensures that transaction types which\nare allowed to join during certain blocked states will not unnecessarily\nwait and cause deadlocks.",
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