Barret Rhoden 9bf3b3649d perf: Add cond_resched() to task_function_call() ...

commit 2ed6edd33a upstream.

Under rare circumstances, task_function_call() can repeatedly fail and
cause a soft lockup.

There is a slight race where the process is no longer running on the cpu
we targeted by the time remote_function() runs.  The code will simply
try again.  If we are very unlucky, this will continue to fail, until a
watchdog fires.  This can happen in a heavily loaded, multi-core virtual
machine.

Reported-by: syzbot+bb4935a5c09b5ff79940@syzkaller.appspotmail.com
Signed-off-by: Barret Rhoden <brho@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200414222920.121401-1-brho@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2020-06-20 10:24:13 +02:00

..

bpf

bpf: Explicitly memset the bpf_attr structure

2020-04-02 17:20:40 +02:00

configs

…

debug

kdb: do a sanity check on the cpu in kdb_per_cpu()

2020-01-29 10:24:24 +01:00

events

perf: Add cond_resched() to task_function_call()

2020-06-20 10:24:13 +02:00

gcov

kernel/gcov/fs.c: gcov_seq_next() should increase position index

2020-05-02 17:23:05 +02:00

irq

genirq/generic_pending: Do not lose pending affinity update

2020-06-03 08:16:47 +02:00

livepatch

…

locking

locktorture: Print ratio of acquisitions, not failures

2020-04-24 07:59:15 +02:00

power

PM: hibernate: Freeze kernel threads in software_resume()

2020-05-05 19:14:36 +02:00

printk

printk: fix integer overflow in setup_log_buf()

2019-11-28 18:28:15 +01:00

rcu

rcuperf: Fix cleanup path for invalid perf_type strings

2019-05-31 06:48:30 -07:00

sched

sched/fair: Don't NUMA balance for kthreads

2020-06-20 10:24:08 +02:00

time

ptp: fix the race between the release of ptp_clock and cdev

2020-05-20 08:15:32 +02:00

trace

Stop the ad-hoc games with -Wno-maybe-initialized

2020-05-20 08:15:37 +02:00

.gitignore

…

acct.c

kernel/acct.c: fix the acct->needcheck check in check_free_space()

2018-01-10 09:29:51 +01:00

async.c

kernel/async.c: revert "async: simplify lowest_in_progress()"

2018-02-17 13:21:18 +01:00

audit_fsnotify.c

…

audit_tree.c

…

audit_watch.c

audit_get_nd(): don't unlock parent too early

2019-12-21 10:40:48 +01:00

audit.c

audit: check the length of userspace generated audit records

2020-05-02 17:23:12 +02:00

audit.h

…

auditfilter.c

audit: fix error handling in audit_data_to_entry()

2020-03-11 07:53:05 +01:00

auditsc.c

audit: print empty EXECVE args

2019-11-28 18:28:55 +01:00

backtracetest.c

…

bounds.c

kbuild: fix kernel/bounds.c 'W=1' warning

2018-11-13 11:16:57 -08:00

capability.c

…

cgroup_freezer.c

…

cgroup_pids.c

cgroup: pids: use atomic64_t for pids->limit

2019-12-21 10:42:02 +01:00

cgroup.c

cgroup: memcg: net: do not associate sock with unrelated cgroup

2020-03-20 09:07:43 +01:00

compat.c

…

configs.c

…

context_tracking.c

…

cpu_pm.c

…

cpu.c

x86/speculation: Remove redundant arch_smt_update() invocation

2020-04-24 07:58:57 +02:00

cpuset.c

sched/cpuset/pm: Fix cpuset vs. suspend-resume bugs

2017-10-12 11:51:25 +02:00

crash_dump.c

…

cred.c

memcg: account security cred as well to kmemcg

2020-01-12 11:24:13 +01:00

delayacct.c

…

dma.c

…

elfcore.c

kernel/elfcore.c: include proper prototypes

2019-10-17 13:42:13 -07:00

exec_domain.c

…

exit.c

kernel/exit.c: release ptraced tasks before zap_pid_ns_processes

2019-02-06 17:33:29 +01:00

extable.c

…

fork.c

kernel/sysctl.c: do not override max_threads provided by userspace

2019-10-17 13:42:44 -07:00

freezer.c

…

futex_compat.c

…

futex.c

futex: Unbreak futex hashing

2020-04-02 17:20:28 +02:00

groups.c

kernel: make groups_sort calling a responsibility group_info allocators

2018-01-10 09:29:52 +01:00

hung_task.c

kernel: hung_task.c: disable on suspend

2019-04-20 09:07:52 +02:00

irq_work.c

…

jump_label.c

jump_label: Invoke jump_label_test() via early_initcall()

2017-12-14 09:28:24 +01:00

kallsyms.c

…

kcmp.c

…

Kconfig.freezer

…

Kconfig.hz

…

Kconfig.locks

…

Kconfig.preempt

…

kcov.c

kcov: ensure irq code sees a valid area

2018-08-03 07:55:12 +02:00

kexec_core.c

objtool, x86: Add several functions and files to the objtool whitelist

2018-06-05 10:28:57 +02:00

kexec_file.c

…

kexec_internal.h

…

kexec.c

…

kmod.c

kmod: make request_module() return an error when autoloading is disabled

2020-04-24 07:58:59 +02:00

kprobes.c

kprobes: Don't call BUG_ON() if there is a kprobe in use on free list

2019-11-25 09:52:15 +01:00

ksysfs.c

…

kthread.c

kthread, tracing: Don't expose half-written comm when creating kthreads

2018-08-03 07:55:12 +02:00

latencytop.c

…

Makefile

x86/uaccess, kcov: Disable stack protector

2019-06-22 08:17:19 +02:00

membarrier.c

…

memremap.c

mm, devm_memremap_pages: kill mapping "System RAM" support

2019-01-13 10:03:51 +01:00

module_signing.c

…

module-internal.h

…

module.c

kernel/module.c: wakeup processes in module_wq on module unload

2019-12-21 10:42:21 +01:00

notifier.c

x86/mm: split vmalloc_sync_all()

2020-04-02 17:20:26 +02:00

nsproxy.c

…

padata.c

padata: purge get_cpu and reorder_via_wq from padata_do_serial

2020-05-27 16:41:53 +02:00

panic.c

panic: ensure preemption is disabled during panic()

2019-10-17 13:42:25 -07:00

params.c

…

pid_namespace.c

signal/pid_namespace: Fix reboot_pid_ns to use send_sig not force_sig

2019-08-04 09:33:16 +02:00

pid.c

pidns: disable pid allocation if pid_ns_prepare_proc() is failed in alloc_pid()

2018-04-13 19:47:53 +02:00

profile.c

…

ptrace.c

ptrace: Fix ->ptracer_cred handling for PTRACE_TRACEME

2019-07-10 09:55:45 +02:00

range.c

…

reboot.c

…

relay.c

kernel/relay.c: handle alloc_percpu returning NULL in relay_open

2020-06-11 09:22:20 +02:00

resource.c

resource: fix integer overflow at reallocation

2018-04-24 09:34:09 +02:00

seccomp.c

seccomp: Move speculation migitation control to arch code

2018-05-22 16:58:02 +02:00

signal.c

signal: Extend exec_id to 64bits

2020-04-24 07:58:54 +02:00

smp.c

cpu/hotplug: Fix SMT supported evaluation

2018-08-15 18:14:53 +02:00

smpboot.c

…

smpboot.h

…

softirq.c

Mark HI and TASKLET softirq synchronous

2018-08-15 18:14:42 +02:00

stacktrace.c

…

stop_machine.c

stop_machine: Use raw spinlocks

2018-08-03 07:55:24 +02:00

sys_ni.c

…

sys.c

kernel/sys.c: prctl: fix false positive in validate_prctl_map()

2019-06-22 08:17:13 +02:00

sysctl_binary.c

…

sysctl.c

kernel: sysctl: make drop_caches write-only

2020-01-04 13:41:04 +01:00

task_work.c

…

taskstats.c

taskstats: fix data-race

2020-01-12 11:24:12 +01:00

test_kprobes.c

…

torture.c

…

tracepoint.c

tracepoint: Do not warn on ENOMEM

2018-05-09 09:50:20 +02:00

tsacct.c

…

ucount.c

…

uid16.c

kernel: make groups_sort calling a responsibility group_info allocators

2018-01-10 09:29:52 +01:00

up.c

…

user_namespace.c

userns: move user access out of the mutex

2018-09-09 20:01:24 +02:00

user-return-notifier.c

…

user.c

…

utsname_sysctl.c

sys: don't hold uts_sem while accessing userspace memory

2018-09-09 20:01:24 +02:00

utsname.c

…

watchdog_hld.c

…

watchdog.c

…

workqueue_internal.h

workqueue: Fix NULL pointer dereference

2017-11-15 15:53:17 +01:00

workqueue.c

workqueue: don't use wq_select_unbound_cpu() for bound works

2020-03-20 09:07:43 +01:00