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 [jbd2]
__ext4_journal_start_sb+0x110/0x188 [ext4]
ext4_do_writepages+0x3dc/0x740 [ext4]
ext4_writepages+0xa4/0x190 [ext4]
do_writepages+0x94/0x228
__writeback_single_inode+0x48/0x318
writeback_sb_inodes+0x204/0x590
__writeback_inodes_wb+0x54/0xf8
wb_writeback+0x2cc/0x3d8
wb_do_writeback+0x2e0/0x2f8
wb_workfn+0x80/0x2a8
process_one_work+0x178/0x3e8
worker_thread+0x234/0x3b8
kthread+0xf0/0x108
ret_from_fork+0x10/0x20
So explicitly call cond_resched() in jbd2_log_do_checkpoint() to avoid
softlockup.
References
Configurations
Configuration 1 (hide)
|
Configuration 2 (hide)
|
History
16 Jan 2026, 20:24
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://git.kernel.org/stable/c/26cb9aad94cb1811d8fae115594cc71fa3d91ab0 - Patch | |
| References | () https://git.kernel.org/stable/c/3faac5e1d14c63260fd1bf789d96bde3ab3d9e54 - Patch | |
| References | () https://git.kernel.org/stable/c/41f40038de62e8306897cf6840791b268996432a - Patch | |
| References | () https://git.kernel.org/stable/c/429d50cbaff45090d52a1ea850d5de8c14881ee7 - Patch | |
| References | () https://git.kernel.org/stable/c/84ff98c1ea19acd3f9389e4bb6061364e943f85e - Patch | |
| References | () https://git.kernel.org/stable/c/9d98cf4632258720f18265a058e62fde120c0151 - Patch | |
| References | () https://git.kernel.org/stable/c/f683d611518d30334813eecf9a8c687453e2800e - Patch | |
| References | () https://git.kernel.org/stable/c/f7ee8fd689e6d534f9fd2494b9266f7998082e65 - Patch | |
| References | () https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html - Third Party Advisory | |
| References | () https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html - Third Party Advisory | |
| CPE | cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
|
| First Time |
Linux
Debian Debian debian Linux Linux linux Kernel |
|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
| CWE | CWE-667 |
03 Nov 2025, 18:16
| Type | Values Removed | Values Added |
|---|---|---|
| References |
|
11 Sep 2025, 17:15
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2025-09-11 17:15
Updated : 2026-01-16 20:24
NVD link : CVE-2025-39782
Mitre link : CVE-2025-39782
CVE.ORG link : CVE-2025-39782
JSON object : View
Products Affected
debian
- debian_linux
linux
- linux_kernel
CWE
CWE-667
Improper Locking