aristocratos/btop

[BUG] Floating point exception issue since updating to linux kernel 6.6

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#662 opened on 2023年11月10日

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buggood first issue

説明

Description btop fails to start, and prints out the error message "floating point exception (core dumped)" after updating the zen kernel to 6.6 on Arch. Booting with the LTS kernel (6.1) makes btop work again.

To Reproduce

I'm not sure, just that after updating the zen kernel to 6.6 provided by Arch Linux, btop stops launching altogether with the above message.

Expected behavior

To work as usual.

Info

  • btop++ version: 1.2.13
  • Binary: static binary as packaged by the Arch team.
  • Architecture: x86_64
  • Platform: Linux
  • (Linux) Kernel: 6.6.1-zen1-1-zen
  • Terminal used: kitty
  • Font used: Droid Sans Font

Additional context

contents of ~/.config/btop/btop.log

2023/11/10 (00:58:27) | ===> btop++ v.1.2.13
2023/11/10 (00:58:27) | DEBUG: Starting in DEBUG mode!
2023/11/10 (00:58:27) | INFO: Logger set to DEBUG
2023/11/10 (00:58:27) | DEBUG: Using locale en_US.UTF-8
2023/11/10 (00:58:27) | INFO: Running on /dev/pts/0
2023/11/10 (00:58:27) | DEBUG: Loading theme file: /home/peter/.config/btop/themes/dracula.theme

GDB Backtrace

The program did not crash when I ran it with gdb, but displayed the message Thread 2 "btop" received signal SIGFPE, Arithmetic exception. [Switching to Thread 0x7ffff75ff6c0 (LWP 14759)] 0x00005555555ba64f in ?? () without making any progress.

Note: the issue seems similar to this one, but unlike that report, I've never compiled btop before.

コントリビューターガイド

技術スタック
cpp
領域
cliperformance
Issue 種別
bug
難度新しい貢献者にとっての実装難度です。1 は非常に小さな変更、5 は専門的な作業です。
4
推定時間経験ある貢献者が調査、実装、テスト、pull request 準備にかけるおおよその時間範囲です。
1-2 days
活動状況Issue が今どれだけ取り組みやすいかを示します。新しい、活発、古い、ブロック中、またはメンテナー入力待ちなどです。
active
明確さ期待される変更、受け入れ条件、次の手順がどれだけ明確かを示します。
needs investigation
前提条件
C++ programmingLinux kernel debuggingGDB usage
初心者向け度初回貢献者にどれだけ取り組みやすいかを 1-100 で推定したスコアです。
15
調査方針
The issue is a floating point exception (SIGFPE) when running btop on Linux kernel 6.6. To diagnose, compare kernel behaviour between 6.6 and 6.1, focusing on system calls or /proc filesystem changes that might cause division by zero or invalid arithmetic. Review btop source code in areas related to CPU or memory stats (e.g., src/linux/collect.cpp) for potential uninitialized values. The GDB backtrace shows the crash in an anonymous function, so compile with debug symbols to pinpoint the exact location. Note that similar issue #308 may provide clues.
[BUG] Floating point exception issue since updating to linux kernel 6.6 · aristocratos/btop#662 | Good First Issue