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[Bug] High CPU usage and input lag from futex contention with sched_yield spin-waiting #17460
Closed as duplicate
Description
Bug Description
futex contention + sched_yield spin-waiting causing 80%+ CPU and multi-second input lag
| time % | seconds | usecs/call | calls | errors | syscall |
|---|---|---|---|---|---|
| 67.17 | 8.648213 | 1292 | 6691 | 593 | futex |
| 11.06 | 1.423371 | 118614 | 12 | 4 | restart_syscall |
| 9.77 | 1.257509 | 19960 | 63 | epoll_pwait2 | |
| 7.80 | 1.004175 | 85 | 11791 | sched_yield | |
| 3.74 | 0.481445 | 59 | 8105 | madvise | |
| 0.28 | 0.036002 | 10 | 3499 | pread64 | |
| 0.05 | 0.007019 | 38 | 184 | statx | |
| 0.04 | 0.005431 | 27 | 196 | 184 | access |
| 0.04 | 0.005192 | 13 | 383 | clock_gettime | |
| 0.02 | 0.002756 | 30 | 89 | write | |
| 0.01 | 0.001065 | 28 | 38 | recvfrom | |
| 0.00 | 0.000453 | 18 | 24 | timerfd_settime | |
| 0.00 | 0.000342 | 342 | 1 | gettid | |
| 0.00 | 0.000312 | 62 | 5 | rt_sigprocmask | |
| 0.00 | 0.000305 | 12 | 25 | 24 | epoll_ctl |
| 0.00 | 0.000244 | 244 | 1 | clone3 | |
| 0.00 | 0.000215 | 23 | 9 | close | |
| 0.00 | 0.000163 | 163 | 1 | prctl | |
| 0.00 | 0.000140 | 17 | 8 | openat | |
| 0.00 | 0.000111 | 111 | 1 | set_robust_list | |
| 0.00 | 0.000109 | 109 | 1 | sched_getaffinity | |
| 0.00 | 0.000088 | 1 | 55 | read | |
| 0.00 | 0.000059 | 59 | 1 | sched_setscheduler | |
| 0.00 | 0.000029 | 29 | 1 | rseq | |
| 0.00 | 0.000000 | 0 | 1 | sendto | |
| 100.00 | 12.874748 | 412 | 31185 | 805 | total |
Environment Info
- Platform: linux
- Terminal: windows-terminal
- Version: 2.1.4
- Feedback ID: a8e5e4a4-93a2-409b-aa8c-2f0825ce6d04
Errors
[{"error":"Error: String not found in file. Failed to apply edit.\n at jyH (/$bunfs/root/claude:2039:731)\n at YC$ (/$bunfs/root/claude:2039:107)\n at s9D (/$bunfs/root/claude:2092:123)\n at HdI (/$bunfs/root/claude:1798:2286)\n at E5 (/$bunfs/root/claude:680:20691)\n at fG (/$bunfs/root/claude:680:39063)\n at _R (/$bunfs/root/claude:680:49671)\n at W5 (/$bunfs/root/claude:680:85807)\n at ph (/$bunfs/root/claude:680:84787)\n at Fq (/$bunfs/root/claude:680:84612)","timestamp":"2026-01-11T08:51:02.632Z"},{"error":"Error: String not found in file. Failed to apply edit.\n at jyH (/$bunfs/root/claude:2039:731)\n at YC$ (/$bunfs/root/claude:2039:107)\n at s9D (/$bunfs/root/claude:2092:123)\n at HdI (/$bunfs/root/claude:1798:2286)\n at E5 (/$bunfs/root/claude:680:20691)\n at fG (/$bunfs/root/claude:680:39063)\n at _R (/$bunfs/root/claude:680:49671)\n at W5 (/$bunfs/root/claude:680:85807)\n at ph (/$bunfs/root/claude:680:84787)\n at Fq (/$bunfs/root/claude:680:84612)","timestamp":"2026-01-11T08:51:03.896Z"},{"error":"Error: String not found in file. Failed to apply edit.\n at jyH (/$bunfs/root/claude:2039:731)\n at YC$ (/$bunfs/root/claude:2039:107)\n at s9D (/$bunfs/root/claude:2092:123)\n at HdI (/$bunfs/root/claude:1798:2286)\n at E5 (/$bunfs/root/claude:680:20691)\n at fG (/$bunfs/root/claude:680:39063)\n at _R (/$bunfs/root/claude:680:49671)\n at W5 (/$bunfs/root/claude:680:85807)\n at ph (/$bunfs/root/claude:680:84787)\n at Fq (/$bunfs/root/claude:680:84612)","timestamp":"2026-01-11T08:51:13.437Z"},{"error":"Error: String not found in file. Failed to apply edit.\n at jyH (/$bunfs/root/claude:2039:731)\n at YC$ (/$bunfs/root/claude:2039:107)\n at s9D (/$bunfs/root/claude:2092:123)\n at HdI (/$bunfs/root/claude:1798:2286)\n at E5 (Note: Error logs were truncated.
Activity
github-actions commentedon Jan 11, 2026
Found 2 possible duplicate issues:
This issue will be automatically closed as a duplicate in 3 days.
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github-actions commentedon Jan 15, 2026
This issue has been automatically closed as a duplicate of #17142.
If this is incorrect, please re-open this issue or create a new one.
🤖 Generated with Claude Code
github-actions commentedon Jan 23, 2026
This issue has been automatically locked since it was closed and has not had any activity for 7 days. If you're experiencing a similar issue, please file a new issue and reference this one if it's relevant.