Hi Tejun,
0day kernel testing robot got the below dmesg and the first bad commit is
git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git review-dfl_files
commit 53fcf10b90f01b8dbdaa9fd380ebe64a10ffbc78
Author: Tejun Heo <[email protected]>
AuthorDate: Thu Jul 3 11:18:30 2014 -0400
Commit: Tejun Heo <[email protected]>
CommitDate: Thu Jul 3 11:18:30 2014 -0400
cgroup: split cgroup_base_files[] into cgroup_{dfl|legacy}_base_files[]
Currently cgroup_base_files[] contains the cgroup core interface files
for both legacy and default hierarchies with each file tagged with
CFTYPE_INSANE and CFTYPE_ONLY_ON_DFL. This is difficult to read.
Let's separate it out to two separate tables, cgroup_dfl_base_files[]
and cgroup_legacy_base_files[], and use the appropriate one in
cgroup_mkdir() depending on the hierarchy type. This makes tagging
each file unnecessary.
This patch doesn't introduce any behavior changes.
Signed-off-by: Tejun Heo <[email protected]>
+-------------------------------------------------------------------------+------------+------------+
| | 4eff080ef0 | 53fcf10b90 |
+-------------------------------------------------------------------------+------------+------------+
| boot_successes | 60 | 0 |
| boot_failures | 0 | 20 |
| WARNING:CPU:PID:at_kernel/cgroup.c:cgroup_init_cftypes() | 0 | 20 |
| WARNING:CPU:PID:at_arch/x86/kernel/cpu/common.c:warn_pre_alternatives() | 0 | 20 |
| BUG:unable_to_handle_kernel_NULL_pointer_dereference | 0 | 20 |
| Oops | 0 | 20 |
| EIP_is_at_strchr | 0 | 20 |
| Kernel_panic-not_syncing:Attempted_to_kill_the_idle_task | 0 | 20 |
| backtrace:cgroup_init_cftypes | 0 | 20 |
| backtrace:warn_slowpath_null | 0 | 20 |
| backtrace:cgroup_init | 0 | 20 |
| backtrace:register_filesystem | 0 | 20 |
+-------------------------------------------------------------------------+------------+------------+
[ 0.020000] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.020000] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.020227] ------------[ cut here ]------------
[ 0.020756] WARNING: CPU: 0 PID: 0 at kernel/cgroup.c:2988 cgroup_init_cftypes+0x7f/0x86()
[ 0.021827] CPU: 0 PID: 0 Comm: swapper Not tainted 3.16.0-rc2-00005-g53fcf10 #369
[ 0.022644] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
[ 0.023510] 00000000 00000000 81b97f50 817e52a2 81b97f80 8103257a 81a73029 00000000
[ 0.024469] 00000000 81a79d73 00000bac 8106e0cc 8106e0cc 81bb29d8 81bb271c 00000000
[ 0.025427] 81b97f90 81032626 00000009 00000000 81b97fa4 8106e0cc 00000000 00020800
[ 0.026389] Call Trace:
[ 0.026665] [<817e52a2>] dump_stack+0x16/0x18
[ 0.027162] [<8103257a>] warn_slowpath_common+0x6b/0x82
[ 0.027734] [<8106e0cc>] ? cgroup_init_cftypes+0x7f/0x86
[ 0.028322] [<8106e0cc>] ? cgroup_init_cftypes+0x7f/0x86
[ 0.028903] [<81032626>] warn_slowpath_null+0x1d/0x1f
[ 0.029467] [<8106e0cc>] cgroup_init_cftypes+0x7f/0x86
[ 0.030015] [<81c8213c>] cgroup_init+0x15/0x1a9
[ 0.030518] [<810f123b>] ? proc_mkdir+0x14/0x16
[ 0.031030] [<81c6eb40>] start_kernel+0x41c/0x453
[ 0.031546] [<81c6e4da>] ? set_init_arg+0x49/0x49
[ 0.032074] [<81c6e2cb>] i386_start_kernel+0x79/0x7d
[ 0.032622] ---[ end trace f7c9b96c96ca301f ]---
[ 0.033214] Initializing cgroup subsys perf_event
git bisect start 7af305fa6329db0131931fa49d30aeb8ebffd865 4c834452aad01531db949414f94f817a86348d59 --
git bisect bad 15c0370d9a7b84a5be4b4c6eb50b68b3a4c8a054 # 08:55 0- 20 Merge 'bluetooth/master' into devel-lkp-hsx01-i386-201407040014
git bisect good d9f509f8cad2453e734c1deeb876e86d6656cecb # 08:59 20+ 0 Merge 'amirv/for-netdev' into devel-lkp-hsx01-i386-201407040014
git bisect bad 2f1320f7cecbb26ee09814c18f6ace48452fca11 # 09:01 0- 20 Merge 'cgroup/review-dfl_files' into devel-lkp-hsx01-i386-201407040014
git bisect bad 53fcf10b90f01b8dbdaa9fd380ebe64a10ffbc78 # 09:04 0- 10 cgroup: split cgroup_base_files[] into cgroup_{dfl|legacy}_base_files[]
git bisect good afbb1b5b595c1a4b1a6f036f220f7b107a504e2d # 09:14 20+ 0 cgroup: make interface file "cgroup.sane_behavior" legacy-only
git bisect good 4eff080ef0fc3d5ba30c6b464c877c24f85b5d71 # 09:17 20+ 0 cgroup: clean up sane_behavior handling
# first bad commit: [53fcf10b90f01b8dbdaa9fd380ebe64a10ffbc78] cgroup: split cgroup_base_files[] into cgroup_{dfl|legacy}_base_files[]
git bisect good 4eff080ef0fc3d5ba30c6b464c877c24f85b5d71 # 09:20 60+ 0 cgroup: clean up sane_behavior handling
git bisect bad 7af305fa6329db0131931fa49d30aeb8ebffd865 # 09:20 0- 11 0day head guard for 'devel-lkp-hsx01-i386-201407040014'
git bisect good 5170a3b24a9141e2349a3420448743b7c68f2223 # 09:23 60+ 0 Merge branch 'akpm' (patches from Andrew Morton)
git bisect good 0e9ce823ad7bc6b85c279223ae6638d47089461e # 09:26 60+ 0 Add linux-next specific files for 20140703
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,
Jet