jbd2: prevent softlockup in jbd2_log_do_checkpoint()

{
  "id": "1734dde142203f8d6ae158e0176ff50ba9feff24fb599e1da9a5842348948253",
  "url": "https://osv.dev/vulnerability/CVE-2025-39782",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "jbd2: prevent softlockup in jbd2_log_do_checkpoint()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: jbd2: prevent softlockup in jbd2_log_do_checkpoint() Both jbd2_log_do_checkpoint() and jbd2_journal_shrink_checkpoint_list() periodically release j_list_lock after processing a batch of buffers to avoid long hold times on the j_list_lock. However, since both functions contend for j_list_lock, the combined time spent waiting and processing can be significant. jbd2_journal_shrink_checkpoint_list() explicitly calls cond_resched() when need_resched() is true to avoid softlockups during prolonged operations. But jbd2_log_do_checkpoint() only exits its loop when need_resched() is true, relying on potentially sleeping functions like __flush_batch() or wait_on_buffer() to trigger rescheduling. If those functions do not sleep, the kernel may hit a softlockup. watchdog: BUG: soft lockup - CPU#3 stuck for 156s! [kworker/u129:2:373] CPU: 3 PID: 373 Comm: kworker/u129:2 Kdump: loaded Not tainted 6.6.0+ #10 Hardware name: Huawei TaiShan 2280 /BC11SPCD, BIOS 1.27 06/13/2017 Workqueue: writeback wb_workfn (flush-7:2) pstate: 20000005 (nzCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : native_queued_spin_lock_slowpath+0x358/0x418 lr : jbd2_log_do_checkpoint+0x31c/0x438 [jbd2] Call trace: native_queued_spin_lock_slowpath+0x358/0x418 jbd2_log_do_checkpoint+0x31c/0x438 [jbd2] __jbd2_log_wait_for_space+0xfc/0x2f8 [jbd2] add_transaction_credits+0x3bc/0x418 [jbd2] start_this_handle+0xf8/0x560 [jbd2] jbd2__journal_start+0x118/0x228 ",
    "evidence": "osv:CVE-2025-39782",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.4.297",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.10.241",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.190",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.149",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.103",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.44",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.16.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2025-39782",
      "aliases": [
        "CVE-2025-39782"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "f93ea411b73594f7d144855fd34278bcf34a9afc"
                },
                {
                  "fixed": "f683d611518d30334813eecf9a8c687453e2800e"
                },
                {
                  "fixed": "f7ee8fd689e6d534f9fd2494b9266f7998082e65"
                },
                {
                  "fixed": "84ff98c1ea19acd3f9389e4bb6061364e943f85e"
                },
                {
                  "fixed": "26cb9aad94cb1811d8fae115594cc71fa3d91ab0"
                },
                {
                  "fixed": "41f40038de62e8306897cf6840791b268996432a"
                },
                {
                  "fixed": "429d50cbaff45090d52a1ea850d5de8c14881ee7"
                },
                {
                  "fixed": "3faac5e1d14c63260fd1bf789d96bde3ab3d9e54"
                },
                {
                  "fixed": "9d98cf4632258720f18265a058e62fde120c0151"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-39782.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "2.6.16"
                },
                {
                  "fixed": "5.4.297"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.5.0"
                },
                {
                  "fixed": "5.10.241"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.190"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.149"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.103"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.44"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.16.4"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-39782.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.424281322Z",
      "provider": "osv",
      "references": [
        "https://cert-portal.siemens.com/productcert/html/ssa-019113.html",
        "https://cert-portal.siemens.com/productcert/html/ssa-032379.html",
        "https://cert-portal.siemens.com/productcert/html/ssa-457936.html",
        "https://git.kernel.org/stable/c/26cb9aad94cb1811d8fae115594cc71fa3d91ab0",
        "https://git.kernel.org/stable/c/3faac5e1d14c63260fd1bf789d96bde3ab3d9e54",
        "https://git.kernel.org/stable/c/41f40038de62e8306897cf6840791b268996432a",
        "https://git.kernel.org/stable/c/429d50cbaff45090d52a1ea850d5de8c14881ee7",
        "https://git.kernel.org/stable/c/84ff98c1ea19acd3f9389e4bb6061364e943f85e",
        "https://git.kernel.org/stable/c/9d98cf4632258720f18265a058e62fde120c0151",
        "https://git.kernel.org/stable/c/f683d611518d30334813eecf9a8c687453e2800e",
        "https://git.kernel.org/stable/c/f7ee8fd689e6d534f9fd2494b9266f7998082e65",
        "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html",
        "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39782.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-39782",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39782.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-39782",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 518024,
  "published_at": "2025-09-11T16:56:32.616+00:00"
}