jbd2: prevent softlockup in jbd2_log_do_checkpoint()
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
CVE-2025-39782
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2025-39782
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "f93ea411b73594f7d144855fd34278bcf34a9afc",
"lessThan": "f683d611518d30334813eecf9a8c687453e2800e",
"versionType": "git"
},
{
"status": "affected",
"version": "f93ea411b73594f7d144855fd34278bcf34a9afc",
"lessThan": "f7ee8fd689e6d534f9fd2494b9266f7998082e65",
"versionType": "git"
},
{
"status": "affected",
"version": "f93ea411b73594f7d144855fd34278bcf34a9afc",
"lessThan": "84ff98c1ea19acd3f9389e4bb6061364e943f85e",
"versionType": "git"
},
{
"status": "affected",
"version": "f93ea411b73594f7d144855fd34278bcf34a9afc",
"lessThan": "26cb9aad94cb1811d8fae115594cc71fa3d91ab0",
"versionType": "git"
},
{
"status": "affected",
"version": "f93ea411b73594f7d144855fd34278bcf34a9afc",
"lessThan": "41f40038de62e8306897cf6840791b268996432a",
"versionType": "git"
},
{
"status": "affected",
"version": "f93ea411b73594f7d144855fd34278bcf34a9afc",
"lessThan": "429d50cbaff45090d52a1ea850d5de8c14881ee7",
"versionType": "git"
},
{
"status": "affected",
"version": "f93ea411b73594f7d144855fd34278bcf34a9afc",
"lessThan": "3faac5e1d14c63260fd1bf789d96bde3ab3d9e54",
"versionType": "git"
},
{
"status": "affected",
"version": "f93ea411b73594f7d144855fd34278bcf34a9afc",
"lessThan": "9d98cf4632258720f18265a058e62fde120c0151",
"versionType": "git"
}
],
"programFiles": [
"fs/jbd2/checkpoint.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.16"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.16",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.4.297",
"versionType": "semver",
"lessThanOrEqual": "5.4.*"
},
{
"status": "unaffected",
"version": "5.10.241",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.190",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.149",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.103",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.44",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.16.4",
"versionType": "semver",
"lessThanOrEqual": "6.16.*"
},
{
"status": "unaffected",
"version": "6.17",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/jbd2/checkpoint.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-39782
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #27067 · Revision 1
- Added to Heist Feed
- Publisher date