linux-block@xxxxxxxxxxxxxxx, tj@xxxxxxxxxx Bcc: Subject: Re: [BUG] blk-throttle panic on 32bit machine after startup Reply-To: CAEKhA2x1Qi3Ywaj9fzdsaChabqDSMe2m2441wReg_V=39_Cuhg@xxxxxxxxxxxxxx I'm the college of the reporter and I would like to provide more information. The code in 5.15-rc6 in "blk-throttle.c" around line 791 is written as below: /* * Previous slice has expired. We must have trimmed it after * last * bio dispatch. That means since start of last slice, we never * used * that bandwidth. Do try to make use of that bandwidth while * giving * credit. */ if (time_after_eq(start, tg->slice_start[rw])) tg->slice_start[rw] = start; I think this piece of code presumes all jiffies values are greater than 0, which is the initial value assigned when kzalloc-ing throtl_grp. It fails on 32-bit linux for the first 5 minutes after booting, since the jiffies value then will be less than 0.
