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

hi, Peter Zijlstra,

On Tue, May 05, 2026 at 05:29:18PM +0200, Peter Zijlstra wrote:
> On Tue, May 05, 2026 at 09:19:49PM +0800, kernel test robot wrote:
> > 
> > 
> > Hello,
> > 
> > 
> > for this change "sched/fair: Increase weight bits for avg_vruntime", we reported
> > "[peterz-queue:sched/hrtick] [sched/fair]  fb047eb995: Oops:general_protection_fault,probably_for_non-canonical_address#:#[##]KASAN_PTI"
> > in [1]
> > 
> > but we cannot reproduce the issue in [1] now with same tests and the same
> > x86_64-randconfig as the kbuild input config for 4823725d9d.
> > 
> > however, with another i386-randconfig in boot tests, we found some random
> > issues for this change which are clean on parent.
> 
> Much of that branch has since made its way upstream -- with various bugs
> fixed. Can any of this be reproduced on tip/sched/urgent ?

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

=========================================================================================
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

if you need more information, please let us know. thanks!