Bug 216054
| Summary: | proc: Fix a dentry lock race between release_task and lookup | ||
|---|---|---|---|
| Product: | File System | Reporter: | Zhihao Cheng (chengzhihao1) |
| Component: | Other | Assignee: | fs_other |
| Status: | NEW --- | ||
| Severity: | normal | ||
| Priority: | P1 | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Kernel Version: | 5.18-rc7 | Subsystem: | |
| Regression: | No | Bisected commit-id: | |
| Attachments: |
a.c
access.sh run.sh |
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(In reply to Zhihao Cheng from comment #0) > Process systemd can take long period high cpu usage during releasing task, > which can be reproduced by following steps: > 1. gcc -o aa a.c > 2. ./run.sh # Termial 1 > 3. ./access.sh # Termial 2, after run.sh finish > 4. time killall -wq aa > real 4m40.946s user 0m0.010s sys 0m0.052s > > $ top # during killall > > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND > > 1 root 20 0 73152 8144 6348 S 99.7 0.0 0:22.56 systemd > > 5117 root 20 0 145096 1688 1448 R 99.7 0.0 0:04.86 ps Created attachment 301081 [details]
a.c
Created attachment 301082 [details]
access.sh
Created attachment 301083 [details]
run.sh
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Process systemd can take long period high cpu usage during releasing task, which can be reproduced by following steps: 1. gcc -o aa a.c 2. ./run.sh # Termial 1 3. ./access.sh # Termial 2, after run.sh finish 4. time killall -wq aa $ top # during killall PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1 root 20 0 73152 8144 6348 S 99.7 0.0 0:22.56 systemd 5117 root 20 0 145096 1688 1448 R 99.7 0.0 0:04.86 ps