From: kernel test robot <oliver.sang@intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: <oe-lkp@lists.linux.dev>, <lkp@intel.com>,
<linux-kernel@vger.kernel.org>,
K Prateek Nayak <kprateek.nayak@amd.com>,
Shubhang Kaushik <shubhang@os.amperecomputing.com>,
<aubrey.li@linux.intel.com>, <yu.c.chen@intel.com>,
<oliver.sang@intel.com>
Subject: [linus:master] [sched/fair] 4823725d9d: INFO:task_blocked_for_more_than#seconds
Date: Tue, 5 May 2026 21:19:49 +0800 [thread overview]
Message-ID: <202605052050.8156b7e0-lkp@intel.com> (raw)
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.
=========================================================================================
tbox_group/testcase/rootfs/kconfig/compiler/sleep:
vm-snb/boot/yocto-i386-minimal-20190520.cgz/i386-randconfig-2006-20250804/gcc-14/1
9fe89f022c05d99c 4823725d9d1d9cc5b36647e0cb8
---------------- ---------------------------
fail:runs %reproduction fail:runs
| | |
:499 13% 64:499 last_state.booting
:499 6% 29:499 dmesg.BUG:kernel_hang_in_boot_stage
:499 7% 33:499 dmesg.BUG:workqueue_lockup-pool
:499 0% 1:499 dmesg.EIP:_raw_spin_unlock_irqrestore
:499 1% 3:499 dmesg.EIP:finish_task_switch
:499 0% 1:499 dmesg.EIP:handle_softirqs
:499 0% 2:499 dmesg.EIP:lock_acquire
:499 0% 1:499 dmesg.EIP:lock_release
:499 0% 1:499 dmesg.EIP:on_each_cpu_cond_mask
:499 0% 1:499 dmesg.EIP:rcu_preempt_deferred_qs_irqrestore
:499 1% 3:499 dmesg.INFO:rcu_preempt_detected_stalls_on_CPUs/tasks
:499 3% 14:499 dmesg.INFO:task_blocked_for_more_than#seconds
below full report is for "dmesg.INFO:task_blocked_for_more_than#seconds",
if you need more information, please let us know. thanks!
[1] https://lore.kernel.org/all/202602032236.bcc0d1b7-lkp@intel.com/
kernel test robot noticed "INFO:task_blocked_for_more_than#seconds" on:
commit: 4823725d9d1d9cc5b36647e0cb8ff616cad6536f ("sched/fair: Increase weight bits for avg_vruntime")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
[test failed on linus/master f1a5e78a55ebf2b05777fd5eb738038ddae609d6]
[test failed on linux-next/master b9303e6bff706758c167af686b5315ad00233bf8]
[test failed on fix commit 556146ce5e9476db234134c46ddf0e154ca17028]
in testcase: boot
config: i386-randconfig-2006-20250804
compiler: gcc-14
test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 32G
(please refer to attached dmesg/kmsg for entire log/backtrace)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <oliver.sang@intel.com>
| Closes: https://lore.kernel.org/oe-lkp/202605052050.8156b7e0-lkp@intel.com
[ 983.510203][ T24] INFO: task kworker/u4:2:45 blocked for more than 492 seconds.
[ 983.696012][ T24] Not tainted 7.0.0-rc1+ #1
[ 983.730478][ T24] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 983.906134][ T24] task:kworker/u4:2 state:D stack:0 pid:45 tgid:45 ppid:44 task_flags:0x8040 flags:0x00080000
[ 984.159850][ T24] Call Trace:
[ 984.407777][ T24] __schedule (sched/core.c:5295 sched/core.c:6908)
[ 984.706338][ T24] ? sched_submit_work (linux/blkdev.h:1205 sched/core.c:6969)
[ 984.907449][ T24] schedule (sched/core.c:6990 sched/core.c:7005)
[ 985.006131][ T24] async_synchronize_cookie_domain (async.c:317 (discriminator 7))
[ 985.104747][ T24] ? swake_up_all (sched/swait.c:82)
[ 985.203211][ T24] wait_for_initramfs (initramfs.c:778)
[ 985.307882][ T24] call_usermodehelper_exec_async (umh.c:108)
[ 985.394170][ T24] ? umh_complete (umh.c:58)
[ 985.706723][ T24] ret_from_fork (x86/kernel/process.c:158)
[ 985.779811][ T24] ? umh_complete (umh.c:58)
[ 986.710694][ T24] ret_from_fork_asm (x86/entry/entry_32.S:736)
[ 987.013319][ T24] entry_INT80_32 (x86/entry/entry_32.S:940)
[ 987.306125][ T24]
[ 987.306125][ T24] Showing all locks held in the system:
[ 987.502551][ T24] 4 locks held by kworker/u4:0/12:
[ 987.544601][ T24] 1 lock held by khungtaskd/24:
[ 987.693891][ T24] #0: b22ae69c (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire (linux/rcupdate.h:311)
[ 987.857208][ T24] 2 locks held by kworker/u4:2/44:
[ 988.011251][ T24] #0: b30d6cc0 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work (workqueue.c:3249)
[ 988.109740][ T24] #1: b39c5f18 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work (workqueue.c:3250)
[ 988.412819][ T24]
[ 988.545186][ T24] =============================================
[ 988.545186][ T24]
BUG: kernel hang in boot stage
The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20260505/202605052050.8156b7e0-lkp@intel.com
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
next reply other threads:[~2026-05-05 13:20 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-05 13:19 kernel test robot [this message]
2026-05-05 15:29 ` [linus:master] [sched/fair] 4823725d9d: INFO:task_blocked_for_more_than#seconds Peter Zijlstra
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