Messages in this thread | | | Date | Tue, 2 Apr 2024 10:17:16 +0200 | From | "Linux regression tracking (Thorsten Leemhuis)" <> | Subject | Bug 218665 - nohz_full=0 prevents kernel from booting |
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Hi, Thorsten here, the Linux kernel's regression tracker.
I noticed a regression report in bugzilla.kernel.org. As many (most?) kernel developers don't keep an eye on it, I decided to forward it by mail.
Tejun, apparently it's cause by a change of yours.
Note, you have to use bugzilla to reach the reporter, as I sadly[1] can not CCed them in mails like this.
Quoting from https://bugzilla.kernel.org/show_bug.cgi?id=218665 :
> booting the current kernel (6.9.0-rc1, master/712e1425) on x86_64 > with nohz_full=0 cause a page fault and prevents the kernel from > booting. > > Steps to reproduce: > - make defconfig > - set CONFIG_NO_HZ_FULL=y > - set CONFIG_SUSPEND=n and CONFIG_HIBERNATION=n (to get CONFIG_PM_SLEEP_SMP=n) > - make > - qemu-system-x86_64 -nographic -cpu qemu64 -smp cores=2 -m 1024 -kernel arch/x86/boot/bzImage -append "earlyprintk=ttyS0 console=ttyS0 root=/dev/dummy rootwait nohz_full=0" > > I have attached the output of a failed nohz_full=0 boot as > nohz_full_0.txt and - for reference - the output of a nohz_full=1 > boot as nohz_full_1.txt. > > Interestingly enough, using the deprecated isolcpus parameter to > enable NO_HZ for cpu0 works. I've attached the output as > isolcpus_nohz_0.txt. > > Bisecting showed 5797b1c18919cd9c289ded7954383e499f729ce0 as first bad commit.
See the ticket for more details.
Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat) -- Everything you wanna know about Linux kernel regression tracking: https://linux-regtracking.leemhuis.info/about/#tldr If I did something stupid, please tell me, as explained on that page.
[1] because bugzilla.kernel.org tells users upon registration their "email address will never be displayed to logged out users"
#regzbot introduced: 5797b1c18919cd9c289ded7954383e499f729ce0 #regzbot from: Friedrich Oslage #regzbot duplicate https://bugzilla.kernel.org/show_bug.cgi?id=218665 #regzbot title: workqueue: nohz_full=0 prevents booting #regzbot ignore-activity
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