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38683148828165ea0b66ace93a9fedc2d3281e27
linux/kernel
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Tejun Heo 3868314882 cgroup: statically initialize init_css_set->dfl_cgrp 
Like other csets, init_css_set's dfl_cgrp is initialized when the cset
gets linked.  init_css_set gets linked in cgroup_init().  This has
been fine till now but the recently added basic CPU usage accounting
may end up accessing dfl_cgrp of init before cgroup_init() leading to
the following oops.

  SELinux:  Initializing.
  BUG: unable to handle kernel NULL pointer dereference at 00000000000000b0
  IP: account_system_index_time+0x60/0x90
  PGD 0 P4D 0
  Oops: 0000 [#1] SMP
  Modules linked in:
  CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.14.0-rc2-00003-g041cd64 #10
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
  +1.9.3-20161025_171302-gandalf 04/01/2014
  task: ffffffff81e10480 task.stack: ffffffff81e00000
  RIP: 0010:account_system_index_time+0x60/0x90
  RSP: 0000:ffff880011e03cb8 EFLAGS: 00010002
  RAX: ffffffff81ef8800 RBX: ffffffff81e10480 RCX: 0000000000000003
  RDX: 0000000000000000 RSI: 00000000000f4240 RDI: 0000000000000000
  RBP: ffff880011e03cc0 R08: 0000000000010000 R09: 0000000000000000
  R10: 0000000000000020 R11: 0000003b9aca0000 R12: 000000000001c100
  R13: 0000000000000000 R14: ffffffff81e10480 R15: ffffffff81e03cd8
  FS:  0000000000000000(0000) GS:ffff880011e00000(0000) knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: 00000000000000b0 CR3: 0000000001e09000 CR4: 00000000000006b0
  DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
  Call Trace:
   <IRQ>
   account_system_time+0x45/0x60
   account_process_tick+0x5a/0x140
   update_process_times+0x22/0x60
   tick_periodic+0x2b/0x90
   tick_handle_periodic+0x25/0x70
   timer_interrupt+0x15/0x20
   __handle_irq_event_percpu+0x7e/0x1b0
   handle_irq_event_percpu+0x23/0x60
   handle_irq_event+0x42/0x70
   handle_level_irq+0x83/0x100
   handle_irq+0x6f/0x110
   do_IRQ+0x46/0xd0
   common_interrupt+0x9d/0x9d

Fix it by statically initializing init_css_set.dfl_cgrp so that init's
default cgroup is accessible from the get-go.

Fixes: 041cd640b2 ("cgroup: Implement cgroup2 basic CPU usage accounting")
Reported-by: “kbuild-all@01.org” <kbuild-all@01.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
2017-09-25 14:02:53 -07:00
..
bpf
bpf: fix ri->map_owner pointer on bpf_prog_realloc
2017-09-19 16:38:53 -07:00
cgroup
cgroup: statically initialize init_css_set->dfl_cgrp
2017-09-25 14:02:53 -07:00
configs
ANDROID: binder: add hwbinder,vndbinder to BINDER_DEVICES.
2017-08-22 18:43:23 -07:00
debug
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h>
2017-03-02 08:42:34 +01:00
events
bpf: one perf event close won't free bpf program attached by another perf event
2017-09-20 14:10:29 -07:00
gcov
gcov: support GCC 7.1
2017-05-12 15:57:15 -07:00
irq
genirq: Fix cpumask check in __irq_startup_managed()
2017-09-16 20:20:56 +02:00
livepatch
livepatch: Fix stacking of patches with respect to RCU
2017-06-20 10:42:19 +02:00
locking
mm: treewide: remove GFP_TEMPORARY allocation flag
2017-09-13 18:53:16 -07:00
power
Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2017-09-12 11:30:56 -07:00
printk
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk
2017-09-07 21:00:52 -07:00
rcu
treewide: make "nr_cpu_ids" unsigned
2017-09-08 18:26:48 -07:00
sched
cpuacct: Introduce cgroup_account_cputime[_field]()
2017-09-25 08:12:04 -07:00
time
drivers/pps: aesthetic tweaks to PPS-related content
2017-09-08 18:26:51 -07:00
trace
Merge tag 'trace-v4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
2017-09-20 06:38:07 -10:00
.gitignore
…
acct.c
fs: make the buf argument to __kernel_write a void pointer
2017-09-04 19:05:15 -04:00
async.c
async: Adjust system_state checks
2017-05-23 10:01:37 +02:00
audit_fsnotify.c
Merge branch 'fsnotify' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2017-05-03 11:05:15 -07:00
audit_tree.c
Merge branch 'fsnotify' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2017-05-03 11:05:15 -07:00
audit_watch.c
Merge tag 'audit-pr-20170816' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit
2017-08-16 16:48:34 -07:00
audit.c
audit: update the function comments
2017-09-05 09:46:59 -04:00
audit.h
ipc: mqueue: Replace timespec with timespec64
2017-09-03 20:21:24 -04:00
auditfilter.c
audit: kernel generated netlink traffic should have a portid of 0
2017-05-02 10:16:05 -04:00
auditsc.c
Merge branch 'work.ipc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-09-14 17:37:26 -07:00
backtracetest.c
…
bounds.c
…
capability.c
…
compat.c
semtimedop(): move compat to native
2017-07-15 20:46:47 -04:00
configs.c
…
context_tracking.c
…
cpu_pm.c
PM / CPU: replace raw_notifier with atomic_notifier
2017-07-31 13:09:49 +02:00
cpu.c
Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2017-09-04 13:53:53 -07:00
crash_core.c
kdump: protect vmcoreinfo data under the crash memory
2017-07-12 16:26:00 -07:00
crash_dump.c
…
cred.c
doc: ReSTify credentials.txt
2017-05-18 10:30:19 -06:00
delayacct.c
sched/headers: Prepare to move cputime functionality from <linux/sched.h> into <linux/sched/cputime.h>
2017-03-02 08:42:39 +01:00
dma.c
…
elfcore.c
…
exec_domain.c
…
exit.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2017-09-11 18:34:47 -07:00
extable.c
lib/extable.c: use bsearch() library function in search_extable()
2017-07-10 16:32:35 -07:00
fork.c
Merge tag 'selinux-pr-20170831' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux
2017-09-12 13:21:00 -07:00
freezer.c
…
futex_compat.c
…
futex.c
futex: Remove duplicated code and fix undefined behaviour
2017-08-25 22:49:59 +02:00
groups.c
kernel/groups.c: use sort library function
2017-07-10 16:32:34 -07:00
hung_task.c
kernel/hung_task.c: defer showing held locks
2017-05-08 17:15:10 -07:00
irq_work.c
…
jump_label.c
jump_label: Provide hotplug context variants
2017-08-10 12:28:59 +02:00
kallsyms.c
kernel/kallsyms.c: replace all_var with IS_ENABLED(CONFIG_KALLSYMS_ALL)
2017-07-10 16:32:34 -07:00
kcmp.c
kcmp: add KCMP_EPOLL_TFD mode to compare epoll target files
2017-07-12 16:26:01 -07:00
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.locks
…
Kconfig.preempt
…
kcov.c
kcov: support compat processes
2017-09-08 18:26:51 -07:00
kexec_core.c
x86/mm, kexec: Allow kexec to be used with SME
2017-07-18 11:38:04 +02:00
kexec_file.c
kexec_file: adjust declaration of kexec_purgatory
2017-07-12 16:26:02 -07:00
kexec_internal.h
kexec_file: adjust declaration of kexec_purgatory
2017-07-12 16:26:02 -07:00
kexec.c
kdump: protect vmcoreinfo data under the crash memory
2017-07-12 16:26:00 -07:00
kmod.c
kmod: move #ifdef CONFIG_MODULES wrapper to Makefile
2017-09-08 18:26:51 -07:00
kprobes.c
kprobes: Ensure that jprobe probepoints are at function entry
2017-07-08 11:05:35 +02:00
ksysfs.c
kexec: move vmcoreinfo out of the kernel's .bss section
2017-07-12 16:25:59 -07:00
kthread.c
kernel/kthread.c: kthread_worker: don't hog the cpu
2017-08-31 16:33:15 -07:00
latencytop.c
sched/headers: Prepare to move sched_info_on() and force_schedstat_enabled() from <linux/sched.h> to <linux/sched/stat.h>
2017-03-02 08:42:39 +01:00
Makefile
kmod: move #ifdef CONFIG_MODULES wrapper to Makefile
2017-09-08 18:26:51 -07:00
memremap.c
mm/device-public-memory: device memory cache coherent with CPU
2017-09-08 18:26:46 -07:00
module_signing.c
…
module-internal.h
…
module.c
module: fix ddebug_remove_module()
2017-07-25 15:08:32 +02:00
notifier.c
kernel/notifier.c: simplify expression
2017-02-24 17:46:56 -08:00
nsproxy.c
perf: Add PERF_RECORD_NAMESPACES to include namespaces related info
2017-03-13 15:57:41 -03:00
padata.c
padata: Avoid nested calls to cpus_read_lock() in pcrypt_init_padata()
2017-05-26 10:10:37 +02:00
panic.c
locking/refcounts, x86/asm: Implement fast refcount overflow protection
2017-08-17 10:40:26 +02:00
params.c
boot/param: Move next_arg() function to lib/cmdline.c for later reuse
2017-04-18 10:37:13 +02:00
pid_namespace.c
userns,pidns: Verify the userns for new pid namespaces
2017-07-20 07:43:58 -05:00
pid.c
pids: make task_tgid_nr_ns() safe
2017-08-21 12:47:31 -07:00
profile.c
sched/headers: Prepare to move sched_info_on() and force_schedstat_enabled() from <linux/sched.h> to <linux/sched/stat.h>
2017-03-02 08:42:39 +01:00
ptrace.c
signal: Remove kernel interal si_code magic
2017-07-24 14:30:28 -05:00
range.c
…
reboot.c
…
relay.c
Merge branch 'work.splice' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-05-02 11:38:06 -07:00
resource.c
…
seccomp.c
seccomp: Implement SECCOMP_RET_KILL_PROCESS action
2017-08-14 13:46:50 -07:00
signal.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2017-09-11 18:34:47 -07:00
smp.c
treewide: make "nr_cpu_ids" unsigned
2017-09-08 18:26:48 -07:00
smpboot.c
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task.h>
2017-03-02 08:42:35 +01:00
smpboot.h
…
softirq.c
sched/core: Remove 'task' parameter and rename tsk_restore_flags() to current_restore_flags()
2017-04-11 09:06:32 +02:00
stacktrace.c
stacktrace/x86: add function for detecting reliable stack traces
2017-03-08 09:18:02 +01:00
stop_machine.c
stop_machine: Provide stop_machine_cpuslocked()
2017-05-26 10:10:36 +02:00
sys_ni.c
…
sys.c
prctl: Allow local CAP_SYS_ADMIN changing exe_file
2017-07-20 07:46:07 -05:00
sysctl_binary.c
fs: fix kernel_write prototype
2017-09-04 19:05:15 -04:00
sysctl.c
kernel/watchdog: split up config options
2017-07-12 16:26:02 -07:00
task_work.c
task_work: Replace spin_unlock_wait() with lock/unlock pair
2017-07-25 10:08:58 -07:00
taskstats.c
taskstats: add e/u/stime for TGID command
2017-05-08 17:15:12 -07:00
test_kprobes.c
…
torture.c
torture: Fix typo suppressing CPU-hotplug statistics
2017-07-25 13:04:45 -07:00
tracepoint.c
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task.h>
2017-03-02 08:42:35 +01:00
tsacct.c
sched/headers: Prepare to move cputime functionality from <linux/sched.h> into <linux/sched/cputime.h>
2017-03-02 08:42:39 +01:00
ucount.c
ucount: Remove the atomicity from ucount->count
2017-03-06 15:26:37 -06:00
uid16.c
sched/headers: Prepare to remove <linux/cred.h> inclusion from <linux/sched.h>
2017-03-02 08:42:31 +01:00
umh.c
kmod: split out umh code into its own file
2017-09-08 18:26:50 -07:00
up.c
smp: Avoid using two cache lines for struct call_single_data
2017-08-29 15:14:38 +02:00
user_namespace.c
userns,pidns: Verify the userns for new pid namespaces
2017-07-20 07:43:58 -05:00
user-return-notifier.c
…
user.c
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/user.h>
2017-03-02 08:42:29 +01:00
utsname_sysctl.c
sched/headers: Remove <linux/rwsem.h> from <linux/sched.h>
2017-03-03 01:45:36 +01:00
utsname.c
sched/headers: Prepare to move the task_lock()/unlock() APIs to <linux/sched/task.h>
2017-03-02 08:42:38 +01:00
watchdog_hld.c
kernel/watchdog: Prevent false positives with turbo modes
2017-08-18 12:35:02 +02:00
watchdog.c
kernel/watchdog: Prevent false positives with turbo modes
2017-08-18 12:35:02 +02:00
workqueue_internal.h
…
workqueue.c
Merge branch 'for-4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq
2017-09-06 21:59:31 -07:00