Message-ID: <cd67fbcd-d659-4822-bb90-7e8fbb40a856@molgen.mpg.de>
Date: Sun, 22 Sep 2024 00:50:21 +0200
From: Paul Menzel <pmenzel@...gen.mpg.de>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Anna-Maria Behnsen <anna-maria@...utronix.de>,
 Frederic Weisbecker <frederic@...nel.org>,
 Thomas Gleixner <tglx@...utronix.de>, LKML <linux-kernel@...r.kernel.org>,
 regressions@...ts.linux.dev
Subject: Error: psi: inconsistent task state! task=1:swapper/0 cpu=0
 psi_flags=4 clear=0 set=4

#regzbot introduced: 2e0199df252a..54a58a787791

Dear Peter,


With merge commit 2004cef11ea0 (Merge tag 'sched-core-2024-09-19' of 
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip) I see the warning 
below on the Intel Kaby Lake laptop Dell XPS 13 9360 and with QEMU.

Dell XPS 13 9360:

     psi: inconsistent task state! task=1:swapper/0 cpu=0 psi_flags=4 
clear=0 set=4

QEMU:

     $ qemu-system-x86_64 -enable-kvm -smp cpus=2 -m 1G -net nic -net 
user,hostfwd=tcp::22222-:22 -kernel /dev/shm/bzImage -append 
"root=/dev/sda1 debug console=ttyS0" -nographic

     psi: inconsistent task state! task=11:kworker/u8:0 cpu=1 psi_fla4

Due to a compile error, I couldn’t bisect all commits, but it’s one of 
the commits below:

     $ git bisect skip
     There are only 'skip'ped commits left to test.
     The first bad commit could be any of:
     781773e3b68031bd001c0c18aa72e8470c225ebd
     a1c446611e31ca5363d4db51e398271da1dce0af
     e1459a50ba31831efdfc35278023d959e4ba775b
     f12e148892ede8d9ee82bcd3e469e6d01fc077ac
     152e11f6df293e816a6a37c69757033cdc72667d
     2e0199df252a536a03f4cb0810324dff523d1e79
     54a58a78779169f9c92a51facf6de7ce94962328
     We cannot bisect more!


Kind regards,

Paul


PS: Build error is:

```
kernel/sched/fair.c: In function ârequeue_delayed_entityâ:
kernel/sched/fair.c:6818:24: warning: unused variable âcfs_rqâ 
[-Wunused-variable]
  6818 |         struct cfs_rq *cfs_rq = cfs_rq_of(se);
       |                        ^~~~~~
   AR      drivers/base/firmware_loader/built-in.a
   AR      drivers/base/built-in.a
   AR      drivers/built-in.a
In file included from kernel/sched/fair.c:54:
kernel/sched/fair.c: In function âswitched_from_fairâ:
kernel/sched/sched.h:2132:24: error: implicit declaration of function 
âstatic_branch_DELAY_ZEROâ; did you mean âstatic_branch_DELAY_DEQUEUEâ? 
[-Wimplicit-function-declaration]
  2132 | #define sched_feat(x) 
(static_branch_##x(&sched_feat_keys[__SCHED_FEAT_##x]))
       |                        ^~~~~~~~~~~~~~
kernel/sched/fair.c:12977:21: note: in expansion of macro âsched_featâ
12977 |                 if (sched_feat(DELAY_ZERO) && p->se.vlag > 0)
       |                     ^~~~~~~~~~
kernel/sched/sched.h:2132:59: error: â__SCHED_FEAT_DELAY_ZEROâ 
undeclared (first use in this function); did you mean 
â__SCHED_FEAT_DELAY_DEQUEUEâ?
  2132 | #define sched_feat(x) 
(static_branch_##x(&sched_feat_keys[__SCHED_FEAT_##x]))
       | 
^~~~~~~~~~~~~
kernel/sched/fair.c:12977:21: note: in expansion of macro âsched_featâ
12977 |                 if (sched_feat(DELAY_ZERO) && p->se.vlag > 0)
       |                     ^~~~~~~~~~
kernel/sched/sched.h:2132:59: note: each undeclared identifier is 
reported only once for each function it appears in
  2132 | #define sched_feat(x) 
(static_branch_##x(&sched_feat_keys[__SCHED_FEAT_##x]))
       | 
^~~~~~~~~~~~~
kernel/sched/fair.c:12977:21: note: in expansion of macro âsched_featâ
12977 |                 if (sched_feat(DELAY_ZERO) && p->se.vlag > 0)
       |                     ^~~~~~~~~~
make[4]: *** [scripts/Makefile.build:244: kernel/sched/fair.o] Error 1
```

PPS: Bisect log:

```
$ git bisect log
git bisect start
# status: waiting for both good and bad commits
# good: [509d2cd12a10d057fdf72f565b930f9a81140d59] Merge tag 
'Smack-for-6.12' of https://github.com/cschaufler/smack-next
git bisect good 509d2cd12a10d057fdf72f565b930f9a81140d59
# status: waiting for bad commit, 1 good commit known
# bad: [509d2cd12a10d057fdf72f565b930f9a81140d59] Merge tag 
'Smack-for-6.12' of https://github.com/cschaufler/smack-next
git bisect bad 509d2cd12a10d057fdf72f565b930f9a81140d59
# bad: [2004cef11ea072838f99bd95cefa5c8e45df0847] Merge tag 
'sched-core-2024-09-19' of 
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect bad 2004cef11ea072838f99bd95cefa5c8e45df0847
# skip: [2e0199df252a536a03f4cb0810324dff523d1e79] sched/fair: Prepare 
exit/cleanup paths for delayed_dequeue
git bisect skip 2e0199df252a536a03f4cb0810324dff523d1e79
# good: [f23c042ce34ba265cf3129d530702b5d218e3f4b] sched/deadline: 
Comment sched_dl_entity::dl_server variable
git bisect good f23c042ce34ba265cf3129d530702b5d218e3f4b
# skip: [a1c446611e31ca5363d4db51e398271da1dce0af] sched,freezer: Mark 
TASK_FROZEN special
git bisect skip a1c446611e31ca5363d4db51e398271da1dce0af
# bad: [85e511df3cec46021024176672a748008ed135bf] sched/eevdf: Allow 
shorter slices to wakeup-preempt
git bisect bad 85e511df3cec46021024176672a748008ed135bf
# good: [8e2e13ac6122915bd98315237b0317495e391be0] sched/fair: Cleanup 
pick_task_fair() vs throttle
git bisect good 8e2e13ac6122915bd98315237b0317495e391be0
# skip: [f12e148892ede8d9ee82bcd3e469e6d01fc077ac] sched/fair: Prepare 
pick_next_task() for delayed dequeue
git bisect skip f12e148892ede8d9ee82bcd3e469e6d01fc077ac
# bad: [54a58a78779169f9c92a51facf6de7ce94962328] sched/fair: Implement 
DELAY_ZERO
git bisect bad 54a58a78779169f9c92a51facf6de7ce94962328
# good: [dfa0a574cbc47bfd5f8985f74c8ea003a37fa078] sched/uclamg: Handle 
delayed dequeue
git bisect good dfa0a574cbc47bfd5f8985f74c8ea003a37fa078
# skip: [781773e3b68031bd001c0c18aa72e8470c225ebd] sched/fair: Implement 
ENQUEUE_DELAYED
git bisect skip 781773e3b68031bd001c0c18aa72e8470c225ebd
# skip: [e1459a50ba31831efdfc35278023d959e4ba775b] sched: Teach 
dequeue_task() about special task states
git bisect skip e1459a50ba31831efdfc35278023d959e4ba775b
# good: [e28b5f8bda01720b5ce8456b48cf4b963f9a80a1] sched/fair: Assert 
{set_next,put_prev}_entity() are properly balanced
git bisect good e28b5f8bda01720b5ce8456b48cf4b963f9a80a1
# skip: [152e11f6df293e816a6a37c69757033cdc72667d] sched/fair: Implement 
delayed dequeue
git bisect skip 152e11f6df293e816a6a37c69757033cdc72667d
# only skipped commits left to test
# possible first bad commit: [54a58a78779169f9c92a51facf6de7ce94962328] 
sched/fair: Implement DELAY_ZERO
# possible first bad commit: [152e11f6df293e816a6a37c69757033cdc72667d] 
sched/fair: Implement delayed dequeue
# possible first bad commit: [e1459a50ba31831efdfc35278023d959e4ba775b] 
sched: Teach dequeue_task() about special task states
# possible first bad commit: [a1c446611e31ca5363d4db51e398271da1dce0af] 
sched,freezer: Mark TASK_FROZEN special
# possible first bad commit: [781773e3b68031bd001c0c18aa72e8470c225ebd] 
sched/fair: Implement ENQUEUE_DELAYED
# possible first bad commit: [f12e148892ede8d9ee82bcd3e469e6d01fc077ac] 
sched/fair: Prepare pick_next_task() for delayed dequeue
# possible first bad commit: [2e0199df252a536a03f4cb0810324dff523d1e79] 
sched/fair: Prepare exit/cleanup paths for delayed_dequeue
```
View attachment "20240922--dell-xps-13-9360--6.11.0-07463-g7048c3743423.txt" of type "text/plain" (69446 bytes)

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