Re: [linus:master] [sched/fair] 4823725d9d: INFO:task_blocked_for_more_than#seconds

[Peter Zijlstra]

On Wed, May 06, 2026 at 04:09:02PM +0800, Oliver Sang wrote:
> hi, Peter Zijlstra,
> 
> On Wed, May 06, 2026 at 09:48:58AM +0200, Peter Zijlstra wrote:
> > On Wed, May 06, 2026 at 03:06:13PM +0800, Oliver Sang wrote:
> > 
> > > we tested upon below commit:
> > > 0c0cf14be4909 (tip/sched/urgent) sched/fair: Fix wakeup_preempt_fair() for not waking up task
> > > 
> > > found most issues are still existing
> > 
> > Moo :-(
> > 
> > > =========================================================================================
> > > compiler/kconfig/rootfs/sleep/tbox_group/testcase:
> > >   gcc-14/i386-randconfig-2006-20250804/yocto-i386-minimal-20190520.cgz/1/vm-snb/boot
> > > 
> > > 9fe89f022c05d99c 4823725d9d1d9cc5b36647e0cb8 0c0cf14be490975a7431e9d49fc
> > > ---------------- --------------------------- ---------------------------
> > >        fail:runs  %reproduction    fail:runs  %reproduction    fail:runs
> > >            |             |             |             |             |
> > >            :499         13%          64:499          5%          23:1001  last_state.booting
> > >            :499          6%          29:499          3%          13:1001  dmesg.BUG:kernel_hang_in_boot_stage
> > >            :499          7%          33:499          2%          10:1001  dmesg.BUG:workqueue_lockup-pool
> > >            :499          0%           1:499          0%           1:1001  dmesg.EIP:_raw_spin_unlock_irqrestore
> > >            :499          1%           3:499          0%           1:1001  dmesg.EIP:finish_task_switch
> > >            :499          0%           1:499          0%            :1001  dmesg.EIP:handle_softirqs
> > >            :499          0%           2:499          0%           1:1001  dmesg.EIP:lock_acquire
> > >            :499          0%           1:499          0%           2:1001  dmesg.EIP:lock_release
> > >            :499          0%           1:499          0%            :1001  dmesg.EIP:on_each_cpu_cond_mask
> > >            :499          0%           1:499          0%            :1001  dmesg.EIP:rcu_preempt_deferred_qs_irqrestore
> > >            :499          1%           3:499          0%           1:1001  dmesg.INFO:rcu_preempt_detected_stalls_on_CPUs/tasks
> > >            :499          3%          14:499          2%          10:1001  dmesg.INFO:task_blocked_for_more_than#seconds
> > > 
> > > the config used for 0c0cf14be4909 is attached as config-7.1.0-rc1+
> > > one dmesg from 0c0cf14be4909 for dmesg.INFO:task_blocked_for_more_than#seconds
> > > is attached as dmesg-0c0cf14be4.decoded.xz
> > 
> > Do you have a URL for that yocto image? git grep yocto on the lkp repo
> > didn't immediately find me one, and I don't appear to have it in my
> > .lkp/cache either.
> 
> it's here:
> https://download.01.org/0day-ci/lkp-qemu/osimage/yocto/yocto-i386-minimal-20190520.cgz

Thanks!, however I'm not seeing boot fails.

I use:

qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 8 -m 8G -device e1000,netdev=u1 -netdev user,id=u1  -serial stdio -monitor pty -display none -append "earlyprintk=ttyS0,115200 force_early_printk console=ttyS0,115201 debug systemd.log_level=info sysrq_always_enabled ignore_loglevel nokaslr kgdboc=ttyS0" -virtfs local,path=$PWD/,mount_tag=tmp,security_model=none -kernel i386-build/arch/x86/boot/bzImage -initrd yocto-i386-minimal-20190520.cgz

and have booted the thing at least 10 times now, each time landing in
the yocto login without issue. Is there anything I'm not doing right?