CVE-2022-50053 in Linux
Sumário
de VulDB • 30/06/2026
Based on the kernel log provided, here is an analysis of the issue and recommended troubleshooting steps.
### **Summary** The system experienced a **Kernel Panic due to `hung_task`**. This means one or more processes were blocked in uninterruptible sleep (`D` state) for longer than the configured timeout (default 120 seconds), causing the kernel watchdog (`khungtaskd`) to panic and halt the system.
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### **Key Log Analysis**
#### 1. The Panic Cause ```text [ 5267.206970] Kernel panic - not syncing: hung_task: blocked tasks
``` - **`hung_task`**: A kernel watchdog feature that detects processes stuck in uninterruptible sleep (`D` state) for too long. - This is often caused by hardware issues (disk I/O, network), driver bugs, or resource exhaustion.
#### 2. The Blocked Process Context The stack trace shows the panic was triggered while handling a **write syscall**: ```text [ 5267.198304] Call Trace:
... [ 5267.198886] ksys_write+0x5c/0xd0 <-- System call for writing to a file descriptor
[ 5267.199367] do_syscall_64+0x3a/0x80
... ``` - **`RDI: 0000000000000001`**: File descriptor `1` (stdout). - **`RSI: 00005569420ee900`**: Pointer to the buffer being written. - **`RDX: 0000000000000002`**: Length of data to write (2 bytes).
This suggests a process was trying to write to stdout when it got stuck, likely waiting for I/O completion or a lock held by another blocked task.
#### 3. System Information - **Kernel Version**: `5.18.0-04958-ga54ce3703613-dirty` - This is an **out-of-tree, custom-built kernel** (indicated by `-dirty`). Custom kernels may have bugs or missing patches present in stable releases. - **Hardware**: Dell PowerEdge R730 with BIOS `2.11.0`. - **Taint Flag**: `G S` - `S`: Loaded a module from outside the tree (likely proprietary drivers). - This increases the likelihood of driver-related issues.
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### **Common Causes & Troubleshooting Steps**
#### ✅ Step 1: Check for I/O Issues (Most Common) Since the hang occurred during a write syscall, check if disk or network storage was unresponsive. - Look at `dmesg` logs **before** this panic for errors like: - `EXT4-fs error`, `XFS corruption`, `SCSI timeout`. - `nvme0q1: I/O completion timed out`. - Network interface drops (`eth0 link down`). - Check if the root filesystem or any mounted storage was under heavy load.
#### ✅ Step 2: Identify Blocked Tasks Before Panic The kernel usually prints a list of hung tasks before panicking. Look for lines like: ```text [timestamp] INFO: task <process_name>:<pid> blocked for more than 120 seconds.
Not tainted 5.18.0-... ``` If you have access to the full log, find these entries and check their stack traces (`Call Trace`) to see what they were waiting on (e.g., `lock`, `wait_on_bit`, `blk_mq_start_request`).
#### ✅ Step 3: Review Custom Kernel & Drivers - The kernel is marked `-dirty` and tainted with proprietary modules. - **Recommendation**: Test with a stable, upstream Linux kernel version to rule out custom code bugs. - Check if any recently updated drivers (especially storage or network) are involved.
#### ✅ Step 4: Hardware Diagnostics Since this is a Dell PowerEdge R730: 1. Run **Dell OpenManage** or `omreport` to check hardware health. 2. Check RAID controller logs for disk errors. 3. Verify memory integrity (run `memtest86+`).
#### ✅ Step 5: Adjust Hung Task Timeout (Temporary Workaround) If this is a non-critical system and you want more time before panic, increase the timeout in `/proc/sys/kernel/hung_task_timeout_secs`: ```bash echo
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