8:39 a.m.
Greetings,
0day kernel testing robot got the below dmesg and the first bad commit is
git://bee.sh.intel.com/git/ydu19/linux cc-v4-on-3.16-rc2
commit 981fa8778958e70170ad2e757bc75f5e3c688665
Author: Yuyang Du <yuyang.du(a)intel.com>
AuthorDate: Wed Jun 25 03:57:18 2014 +0800
Commit: Yuyang Du <yuyang.du(a)intel.com>
CommitDate: Thu Jun 26 15:06:56 2014 +0800
Define SD_WORKLOAD_CONSOLIDATION and attach to sched_domain
Workload Consolidation is completely CPU topology and policy driven. To do so,
we define SD_WORKLOAD_CONSOLIDATION, and add some fields in sched_domain struct:
1) total_groups is the group number in total in this domain
2) group_number is this CPU's group sequence number
3) consolidating_coeff is the coefficient for consolidating CPUs, and is changeable
via sysctl tool to make consolidation more aggressive or less
4) first_group is the pointer to this domain's first group ordered by CPU number
This patchset enables SD_WORKLOAD_CONSOLIDATION in MC domain by default. But we need
to come up with a better way to determine on which architecture this flag should be
enabled or not. Thanks to PeterZ and Dietmar for pointing this out and help me
finally understand it.
Signed-off-by: Yuyang Du <yuyang.du(a)intel.com>
===================================================
PARENT COMMIT NOT CLEAN. LOOK OUT FOR WRONG BISECT!
===================================================
Attached dmesg for the parent commit, too, to help confirm whether it is a noise error.
+-------------------------------------------------------------+------------+------------+------------------+
| | 3b3fb61976 | 981fa87789 |
v3.16-rc2_062617 |
+-------------------------------------------------------------+------------+------------+------------------+
| boot_successes | 76 | 0 |
0 |
| boot_failures | 3 | 20 |
13 |
| WARNING:CPU:PID:at_mm/early_ioremap.c:__early_ioremap() | 1 | |
|
| BUG:kernel_boot_crashed | 2 | |
|
| WARNING:CPU:PID:at_kernel/sched/core.c:build_sched_domain() | 0 | 20 |
13 |
| backtrace:build_sched_domains | 0 | 20 |
13 |
| backtrace:sched_init_smp | 0 | 20 |
13 |
| backtrace:kernel_init_freeable | 0 | 20 |
13 |
| BUG:unable_to_handle_kernel_NULL_pointer_dereference | 0 | 0 |
6 |
| Oops | 0 | 0 |
6 |
| RIP:run_timer_softirq | 0 | 0 |
1 |
| Kernel_panic-not_syncing:Fatal_exception_in_interrupt | 0 | 0 |
3 |
| backtrace:cryptomgr_test | 0 | 0 |
2 |
| BUG:unable_to_handle_kernel_paging_request | 0 | 0 |
5 |
| RIP:kzfree | 0 | 0 |
3 |
| Kernel_panic-not_syncing:Fatal_exception | 0 | 0 |
4 |
| RIP:__insert_vmap_area | 0 | 0 |
1 |
| backtrace:add_disk | 0 | 0 |
1 |
| backtrace:null_init | 0 | 0 |
1 |
| kernel_BUG_at_kernel/cred.c | 0 | 0 |
1 |
| invalid_opcode | 0 | 0 |
1 |
| RIP:__invalid_creds | 0 | 0 |
1 |
| backtrace:delayed_put_task_struct | 0 | 0 |
1 |
| BUG:u | 0 | 0 |
1 |
| INFO:task_blocked_for_more_than_seconds | 0 | 0 |
1 |
| RIP:native_safe_halt | 0 | 0 |
1 |
| RIP:flat_send_IPI_mask | 0 | 0 |
1 |
| Kernel_panic-not_syncing:hung_task:blocked_tasks | 0 | 0 |
1 |
| backtrace:register_pernet_subsys | 0 | 0 |
1 |
| backtrace:packet_init | 0 | 0 |
1 |
| backtrace:watchdog | 0 | 0 |
1 |
| BUG:unable_to_handle_kernel | 0 | 0 |
1 |
| RIP:no_context | 0 | 0 |
1 |
| INFO:trying_to_register_non-static_key | 0 | 0 |
1 |
+-------------------------------------------------------------+------------+------------+------------------+
[ 0.169944] smpboot: Total of 2 processors activated (9575.99 BogoMIPS)
[ 0.172397] ------------[ cut here ]------------
[ 0.172397] ------------[ cut here ]------------
[ 0.173600] WARNING: CPU: 0 PID: 1 at kernel/sched/core.c:6069
build_sched_domain+0xbe/0x2e8()
git bisect start 9c33bf1e59d26dad8dc45e438cbdc28783589b11
a497c3ba1d97fc69c1e78e7b96435ba8c2cb42ee --
git bisect good 10d9d029067f2aacbdc140786efff146d79b34c5 # 23:21 20+ 1 Merge
'cgroup/for-3.16-fixes' into devel-hourly-2014062617
git bisect bad b8db0fc896849e940f23fbea02c137869c94f3d3 # 23:44 0- 20 Merge
'kvm-ppc/kvm-ppc-queue' into devel-hourly-2014062617
git bisect good 7135b130d9f1c30321f9a9e024498557026cdd03 # 00:11 20+ 0 Merge
'arm-platforms/kvm-arm64/irq-forward' into devel-hourly-2014062617
git bisect good c2484a8acda7d9ff41a98d3e2fcc5a65bbd02747 # 00:21 20+ 1 Merge
'arc/for-next' into devel-hourly-2014062617
git bisect good 1a799f5c9dbbd47d503af1e0cedf9d252cca2d6d # 00:37 20+ 19 Merge
'cryptodev/master' into devel-hourly-2014062617
git bisect bad 9c259d6a46e754ea8fb42bcf688255ffa2c8c048 # 00:40 0- 11 Merge
'yuyang/cc-v4-on-3.16-rc2' into devel-hourly-2014062617
git bisect bad 1a43e8a377f4adc5c9a412de1a57ab453f8313d4 # 00:45 0- 1 Workload
Consolidation: Consolidating workload to a subset of CPUs if possible
git bisect good 7dee841147a972e809dfcd75f638d7145dd8e756 # 00:50 20+ 0 sched:
Precise accumulated time and acount runnable number in update_entity_runnable_avg
git bisect bad 981fa8778958e70170ad2e757bc75f5e3c688665 # 00:54 0- 20 Define
SD_WORKLOAD_CONSOLIDATION and attach to sched_domain
git bisect good 3b3fb61976509ef8f7c0c05adba0b61cea6b05db # 00:59 20+ 1 How CPU
ConCurrency (CC) accrues with runqueue change and time
# first bad commit: [981fa8778958e70170ad2e757bc75f5e3c688665] Define
SD_WORKLOAD_CONSOLIDATION and attach to sched_domain
git bisect good 3b3fb61976509ef8f7c0c05adba0b61cea6b05db # 01:02 60+ 4 How CPU
ConCurrency (CC) accrues with runqueue change and time
git bisect bad 9c33bf1e59d26dad8dc45e438cbdc28783589b11 # 01:02 0- 13 0day
head guard for 'devel-hourly-2014062617'
git bisect good eb477e03feb8dacb3a9e3b2f750ff6c6eeffee33 # 05:06 60+ 4 Merge
git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending
git bisect good 96426007c90cde23c0402856f3e0aec0f4cc2e48 # 08:30 60+ 53 Add
linux-next specific files for 20140627
This script may reproduce the error.
-----------------------------------------------------------------------------
#!/bin/bash
kernel=$1
kvm=(
qemu-system-x86_64 -cpu kvm64 -enable-kvm
-kernel $kernel
-smp 2
-m 256M
-net nic,vlan=0,macaddr=00:00:00:00:00:00,model=virtio
-net user,vlan=0
-net nic,vlan=1,model=e1000
-net user,vlan=1
-boot order=nc
-no-reboot
-watchdog i6300esb
-serial stdio
-display none
-monitor null
)
append=(
debug
sched_debug
apic=debug
ignore_loglevel
sysrq_always_enabled
panic=10
prompt_ramdisk=0
earlyprintk=ttyS0,115200
console=ttyS0,115200
console=tty0
vga=normal
root=/dev/ram0
rw
)
"${kvm[@]}" --append "${append[*]}"
-----------------------------------------------------------------------------
Thanks,
Fengguang
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