Bug 215527
| Summary: | Random freeze in bfq_put_idle_entity / bfq_exit_icq_bfqq | ||
|---|---|---|---|
| Product: | IO/Storage | Reporter: | Bernd Buschinski (b.buschinski) |
| Component: | Block Layer | Assignee: | Paolo Valente (paolo.valente) |
| Status: | RESOLVED CODE_FIX | ||
| Severity: | normal | CC: | regressions |
| Priority: | P1 | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Kernel Version: | 5.15.15 | Subsystem: | |
| Regression: | No | Bisected commit-id: | |
|
Description
Bernd Buschinski
2022-01-24 13:22:42 UTC
(In reply to Bernd Buschinski from comment #0) > With kernel 5.15.15 (possible all 5.15*, don't know when it really started) > I get random freezes and a system log like: But it used to work fine in older versions (like 5.14?)? Or has it always been there? (In reply to The Linux kernel's regression tracker (Thorsten Leemhuis) from comment #1) > (In reply to Bernd Buschinski from comment #0) > > With kernel 5.15.15 (possible all 5.15*, don't know when it really started) > > I get random freezes and a system log like: > > But it used to work fine in older versions (like 5.14?)? Or has it always > been there? As far as I can remember, it used to work fine with 5.14*. BUT as this happens more or less randomly, it might be possible that I just didn't notice/trigger it. (In reply to Bernd Buschinski from comment #2) > As far as I can remember, it used to work fine with 5.14*. thx, I'll track it as a regression then. Might not be one, but "random freezes" is something that shouldn't happen, so it might be worth tracking anyway. > BUT as this happens more or less randomly, it might be possible that I just > didn't notice/trigger it. It's up to the maintainers to handle this, but two quick notes from my side: * a bisection (https://www.kernel.org/doc/html/latest/admin-guide/bug-bisect.html ) would be helpful, but I guess it won't be possible here? * you might want to give 5.17-rc1 a try, maybe you are lucky and this already was fixed in between (In reply to The Linux kernel's regression tracker (Thorsten Leemhuis) from comment #3) > (In reply to Bernd Buschinski from comment #2) > > > As far as I can remember, it used to work fine with 5.14*. > > thx, I'll track it as a regression then. Might not be one, but "random > freezes" is something that shouldn't happen, so it might be worth tracking > anyway. > > > BUT as this happens more or less randomly, it might be possible that I just > > didn't notice/trigger it. > > It's up to the maintainers to handle this, but two quick notes from my side: > > * a bisection > (https://www.kernel.org/doc/html/latest/admin-guide/bug-bisect.html ) would > be helpful, but I guess it won't be possible here? > > * you might want to give 5.17-rc1 a try, maybe you are lucky and this > already was fixed in between I will try 5.16.3 "soon" and if this does not help 5.17-rc*. *if* I find a kind of reliable reproducer, I will try to bisect. The only hint I got is: it seems to happen more frequently when building (big) docker images, but this is a 1 out of 10 situations. But sometimes didn't even happen after 20 retries, and it takes a long time. For the record: I tried to use 5.16.3 and 5.17-rc2, but I am blocked by another regression (https://bugzilla.kernel.org/show_bug.cgi?id=215550), meaning I can not really daily drive them, so I can't test if this issue is fixed in newer versions. Paolo, what the status here? Nothing happened for a while? What up here? Bernd, is the problem still happening and did you try latest mainline? Paolo, did you have a chance to look into this? I am currently using 5.16.8 (for a few days now), the issue did not appear again. So I assume it was fixed in between. If it ever reappears, or if I find a reproducer, I would reopen this ticket. |