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Bug 1692252 - WARNING: CPU: 5 PID: 26907 at kernel/sched/deadline.c:186 task_non_contending+0x25e/0x300
Summary: WARNING: CPU: 5 PID: 26907 at kernel/sched/deadline.c:186 task_non_contending...
Status: NEW
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: kernel-rt
Version: 7.7
Hardware: Unspecified
OS: Unspecified
Target Milestone: rc
: ---
Assignee: Juri Lelli
QA Contact: Qiao Zhao
Depends On:
TreeView+ depends on / blocked
Reported: 2019-03-25 07:12 UTC by Qiao Zhao
Modified: 2019-03-27 07:30 UTC (History)
2 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Last Closed:
Target Upstream Version:

Attachments (Terms of Use)

Description Qiao Zhao 2019-03-25 07:12:33 UTC
Description of problem:

[ 2418.835535] restraintd[11835]: ** Running task: 89850037 [/kernel/scheduler/sched_deadline/Sanity] 
[ 2436.824226] ------------[ cut here ]------------ 
[ 2436.824241] WARNING: CPU: 5 PID: 26907 at kernel/sched/deadline.c:186 task_non_contending+0x25e/0x300 
[ 2436.824319] Modules linked in: rpcrdma ib_isert iscsi_target_mod ib_iser libiscsi scsi_transport_iscsi ib_srpt target_core_mod ib_srp scsi_transport_srp scsi_tgt ib_ipoib rdma_ucm ib_uverbs ib_umad rdma_cm ib_cm iw_cm ib_core nls_koi8_u nls_cp932 ts_kmp nf_conntrack_ipv4 nf_defrag_ipv4 nf_conntrack rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver nfs lockd grace fscache sunrpc amd64_edac_mod edac_mce_amd crc32_pclmul ghash_clmulni_intel aesni_intel lrw gf128mul glue_helper ablk_helper cryptd joydev pcspkr sp5100_tco fam15h_power k10temp i2c_piix4 sg ipmi_ssif ipmi_si ipmi_devintf ipmi_msghandler hpilo hpwdt acpi_power_meter xfs sd_mod crc_t10dif crct10dif_generic sr_mod cdrom crct10dif_pclmul crct10dif_common crc32c_intel igb dca radeon ata_generic sfc pata_acpi serio_raw i2c_algo_bit tg3 mtd drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm drm drm_panel_orientation_quirks pata_atiixp bnx2x mdio ptp pps_core hpsa libcrc32c scsi_transport_sas netxen_nic ahci libahci libata dm_mirror dm_region_hash dm_log dm_mod [last unloaded: zlib] 
[ 2436.824352] CPU: 5 PID: 26907 Comm: deadline_test Kdump: loaded Tainted: G               ------------ T 3.10.0-1025.rt56.984.el7.x86_64 #1 
[ 2436.824353] Hardware name: HP ProLiant DL585 G7, BIOS A16 03/19/2012 
[ 2436.824355] Call Trace: 
[ 2436.824369]  [<ffffffffaf363ef3>] dump_stack+0x19/0x1b 
[ 2436.824377]  [<ffffffffaec8935b>] __warn+0xfb/0x120 
[ 2436.824382]  [<ffffffffaec8949d>] warn_slowpath_null+0x1d/0x20 
[ 2436.824387]  [<ffffffffaece093e>] task_non_contending+0x25e/0x300 
[ 2436.824393]  [<ffffffffaece0a77>] dequeue_task_dl+0x97/0x140 
[ 2436.824398]  [<ffffffffaecc73d6>] deactivate_task+0x46/0xd0 
[ 2436.824405]  [<ffffffffaf369527>] __schedule+0x747/0x930 
[ 2436.824410]  [<ffffffffaece107c>] ? prio_changed_dl+0x6c/0x80 
[ 2436.824416]  [<ffffffffaf369740>] schedule+0x30/0x96 
[ 2436.824420]  [<ffffffffaf36a2dd>] __rt_mutex_slowlock+0xdd/0x160 
[ 2436.824425]  [<ffffffffaf36a783>] rt_mutex_slowlock_locked+0xc3/0x1c0 
[ 2436.824431]  [<ffffffffaed646be>] ? trace_buffer_lock_reserve+0x1e/0x60 
[ 2436.824435]  [<ffffffffaf36a8fc>] rt_mutex_slowlock+0x7c/0xc0 
[ 2436.824441]  [<ffffffffaf36a9ef>] rt_mutex_lock+0x6f/0x90 
[ 2436.824445]  [<ffffffffaf36c0ee>] _mutex_lock+0xe/0x10 
[ 2436.824450]  [<ffffffffaee35a05>] SyS_write+0x65/0xf0 
[ 2436.824455]  [<ffffffffaf3760a1>] ? system_call_after_swapgs+0xae/0x146 
[ 2436.824459]  [<ffffffffaf37615e>] system_call_fastpath+0x25/0x2a 
[ 2436.824464]  [<ffffffffaf3760a1>] ? system_call_after_swapgs+0xae/0x146 
[ 2436.824468] ---[ end trace 0000000000000002 ]--- 

Please see the detailed info in

Version-Release number of selected component (if applicable):
kernel is kernel-rt-3.10.0-1025.rt56.984.el7.x86_64

How reproducible:

Steps to Reproduce:
1. Install rt-tests
# for i in `seq 100`; do deadline_test; done
or run /kernel/scheduler/sched_deadline/Sanity

Actual results:

Expected results:

Additional info:

Comment 1 Juri Lelli 2019-03-26 07:28:11 UTC
Hi Qiao,

Could you please test again with scratch build below?


Comment 2 Qiao Zhao 2019-03-27 06:34:44 UTC
(In reply to Juri Lelli from comment #1)
> Hi Qiao,
> Could you please test again with scratch build below?
> 1030.rt56.989.bz1692252.el7/kernel-rt-3.10.0-1030.rt56.989.bz1692252.el7.repo
> Thanks!

Hi Juri,

I have tested your build kernel-rt-3.10.0-1030.rt56.989.bz1692252.el7,
and running "deadline_test" more than 150 times on, everything looks good, no such call trace again.


Comment 3 Juri Lelli 2019-03-27 07:30:38 UTC
Great! Thanks for testing.

I'll report upstream that patch seems to be working and
post it to kernel-rt for wider review as soon as it is

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