Steven Rostedt (VMware) 2de780dfbe ftrace: Handle tracing when switching between context ... commit 726b3d3f14 upstream. When an interrupt or NMI comes in and switches the context, there's a delay from when the preempt_count() shows the update. As the preempt_count() is used to detect recursion having each context have its own bit get set when tracing starts, and if that bit is already set, it is considered a recursion and the function exits. But if this happens in that section where context has changed but preempt_count() has not been updated, this will be incorrectly flagged as a recursion. To handle this case, create another bit call TRANSITION and test it if the current context bit is already set. Flag the call as a recursion if the TRANSITION bit is already set, and if not, set it and continue. The TRANSITION bit will be cleared normally on the return of the function that set it, or if the current context bit is clear, set it and clear the TRANSITION bit to allow for another transition between the current context and an even higher one. Cc: stable@vger.kernel.org Fixes: edc15cafcb ("tracing: Avoid unnecessary multiple recursion checks") Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2020-11-10 12:35:58 +01:00
..
bpf	bpf: Fix a rcu warning for bpffs map pretty-print	2020-10-01 13:14:52 +02:00
cgroup	cgroup: add missing skcd->no_refcnt check in cgroup_sk_clone()	2020-08-19 08:14:47 +02:00
configs	kconfig: tinyconfig: remove stale stack protector fixups	2018-06-15 07:15:28 +09:00
debug	kgdb: Make "kgdbcon" work properly with "kgdb_earlycon"	2020-11-05 11:08:41 +01:00
dma	dma-debug: add a schedule point in debug_dma_dump_mappings()	2020-01-04 19:12:43 +01:00
events	perf: Fix task_function_call() error handling	2020-10-14 10:31:26 +02:00
gcov	gcov: add support for GCC 10.1	2020-09-17 13:45:31 +02:00
irq	genirq/matrix: Deal with the sillyness of for_each_cpu() on UP	2020-09-03 11:24:29 +02:00
livepatch	livepatch: Nullify obj->mod in klp_module_coming()'s error path	2019-10-07 18:57:10 +02:00
locking	locking/lockdep: Fix overflow in presentation of average lock-time	2020-09-03 11:24:21 +02:00
power	PM: hibernate: remove the bogus call to get_gendisk() in software_resume()	2020-10-30 10:38:28 +01:00
printk	printk: handle blank console arguments passed in.	2020-10-01 13:14:45 +02:00
rcu	rcu: Avoid data-race in rcu_gp_fqs_check_wake()	2020-02-11 04:33:55 -08:00
sched	sched/features: Fix !CONFIG_JUMP_LABEL case	2020-10-30 10:38:25 +01:00
time	timekeeping: Prevent 32bit truncation in scale64_check_overflow()	2020-10-01 13:14:36 +02:00
trace	ftrace: Handle tracing when switching between context	2020-11-10 12:35:58 +01:00
.gitignore
acct.c	acct_on(): don't mess with freeze protection	2019-05-31 06:46:05 -07:00
async.c
audit_fsnotify.c
audit_tree.c	audit: Embed key into chunk	2019-12-13 08:51:11 +01:00
audit_watch.c	audit: CONFIG_CHANGE don't log internal bookkeeping as an event	2020-10-01 13:14:33 +02:00
audit.c	audit: fix a net reference leak in audit_list_rules_send()	2020-06-22 09:05:13 +02:00
audit.h	audit: fix a net reference leak in audit_list_rules_send()	2020-06-22 09:05:13 +02:00
auditfilter.c	audit: fix a net reference leak in audit_list_rules_send()	2020-06-22 09:05:13 +02:00
auditsc.c	audit: print empty EXECVE args	2019-12-01 09:17:17 +01:00
backtracetest.c
bounds.c	kbuild: fix kernel/bounds.c 'W=1' warning	2018-11-13 11:08:47 -08:00
capability.c	LSM: generalize flag passing to security_capable	2020-01-23 08:21:29 +01:00
compat.c	make 'user_access_begin()' do 'access_ok()'	2020-06-22 09:04:58 +02:00
configs.c
context_tracking.c
cpu_pm.c	kernel/cpu_pm: Fix uninitted local in cpu_pm	2020-06-22 09:05:28 +02:00
cpu.c	sched/core: Fix illegal RCU from offline CPUs	2020-06-22 09:05:14 +02:00
crash_core.c	kernel/crash_core.c: print timestamp using time64_t	2018-08-22 10:52:47 -07:00
crash_dump.c
cred.c	memcg: account security cred as well to kmemcg	2020-01-09 10:19:00 +01:00
delayacct.c
dma.c
elfcore.c	kernel/elfcore.c: include proper prototypes	2019-10-11 18:21:23 +02:00
exec_domain.c
exit.c	exit: Move preemption fixup up, move blocking operations down	2020-06-22 09:05:14 +02:00
extable.c
fail_function.c	bpf/error-inject/kprobes: Clear current_kprobe and enable preempt in kprobe	2018-06-21 12:33:19 +02:00
fork.c	mm, oom_adj: don't loop through tasks in __set_oom_adj when not necessary	2020-10-29 09:55:15 +01:00
freezer.c	PM / reboot: Eliminate race between reboot and suspend	2018-08-06 12:35:20 +02:00
futex.c	futex: Fix incorrect should_fail_futex() handling	2020-11-05 11:08:38 +01:00
groups.c
hung_task.c	kernel: hung_task.c: disable on suspend	2019-04-20 09:16:02 +02:00
iomem.c
irq_work.c	irq_work: Do not raise an IPI when queueing work on the local CPU	2019-05-31 06:46:19 -07:00
jump_label.c	jump_label: move 'asm goto' support test to Kconfig	2019-06-04 08:02:34 +02:00
kallsyms.c	kallsyms: Refactor kallsyms_show_value() to take cred	2020-07-16 08:17:26 +02:00
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt	kconfig: include kernel/Kconfig.preempt from init/Kconfig	2018-08-02 08:06:54 +09:00
kcov.c	kernel/kcov.c: mark write_comp_data() as notrace	2019-02-12 19:47:20 +01:00
kexec_core.c	kexec: Allocate decrypted control pages for kdump if SME is enabled	2019-11-24 08:20:29 +01:00
kexec_file.c	treewide: Use array_size() in vzalloc()	2018-06-12 16:19:22 -07:00
kexec_internal.h
kexec.c	kexec: add call to LSM hook in original kexec_load syscall	2018-07-16 12:31:57 -07:00
kmod.c	kmod: make request_module() return an error when autoloading is disabled	2020-04-17 10:48:52 +02:00
kprobes.c	kprobes: Fix compiler warning for !CONFIG_KPROBES_ON_FTRACE	2020-10-01 13:14:54 +02:00
ksysfs.c
kthread.c	kthread_worker: prevent queuing delayed work from timer_fn when it is being canceled	2020-11-10 12:35:58 +01:00
latencytop.c
Makefile	y2038: futex: Move compat implementation into futex.c	2019-12-01 09:17:38 +01:00
memremap.c	mm/memory_hotplug: shrink zones when offlining memory	2020-01-29 16:43:27 +01:00
module_signing.c	modsign: log module name in the event of an error	2018-07-02 11:36:17 +02:00
module-internal.h	modsign: log module name in the event of an error	2018-07-02 11:36:17 +02:00
module.c	module: Correctly truncate sysfs sections output	2020-08-21 11:05:34 +02:00
notifier.c	x86/mm: split vmalloc_sync_all()	2020-03-25 08:06:13 +01:00
nsproxy.c
padata.c	padata: purge get_cpu and reorder_via_wq from padata_do_serial	2020-05-27 17:37:36 +02:00
panic.c	kernel/panic.c: do not append newline to the stack protector panic string	2019-12-01 09:17:10 +01:00
params.c
pid_namespace.c	signal/pid_namespace: Fix reboot_pid_ns to use send_sig not force_sig	2019-07-26 09:14:01 +02:00
pid.c	Fix failure path in alloc_pid()	2019-01-13 09:51:06 +01:00
profile.c
ptrace.c	ptrace: reintroduce usage of subjective credentials in ptrace_has_cap()	2020-01-23 08:21:29 +01:00
range.c
reboot.c	PM / reboot: Eliminate race between reboot and suspend	2018-08-06 12:35:20 +02:00
relay.c	kernel/relay.c: fix memleak on destroy relay channel	2020-08-26 10:30:59 +02:00
resource.c	resource: fix locking in find_next_iomem_res()	2019-09-16 08:22:20 +02:00
rseq.c	rseq: uapi: Declare rseq_cs field as union, update includes	2018-07-10 22:18:52 +02:00
seccomp.c	LSM: generalize flag passing to security_capable	2020-01-23 08:21:29 +01:00
signal.c	ptrace: fix task_join_group_stop() for the case when current is traced	2020-11-10 12:35:53 +01:00
smp.c	cpu/hotplug: Fix "SMT disabled by BIOS" detection for KVM	2019-02-12 19:47:25 +01:00
smpboot.c	smpboot: Remove cpumask from the API	2018-07-03 09:20:44 +02:00
smpboot.h
softirq.c	nohz: Fix missing tick reprogram when interrupting an inline softirq	2018-08-03 15:52:10 +02:00
stacktrace.c
stop_machine.c	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-08-13 11:25:07 -07:00
sys_ni.c	Merge branch 'core-rseq-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-06-10 10:17:09 -07:00
sys.c	kernel/sys.c: avoid copying possible padding bytes in copy_to_user	2020-10-01 13:14:29 +02:00
sysctl_binary.c
sysctl.c	kernel: sysctl: make drop_caches write-only	2020-01-04 19:13:17 +01:00
task_work.c
taskstats.c	taskstats: fix data-race	2020-01-09 10:18:59 +01:00
test_kprobes.c	kprobes: Remove jprobe API implementation	2018-06-21 12:33:05 +02:00
torture.c	torture: Keep old-school dmesg format	2018-06-25 11:30:10 -07:00
tracepoint.c	tracepoint: Fix tracepoint array element size mismatch	2018-10-17 15:35:29 -04:00
tsacct.c
ucount.c
uid16.c
uid16.h
umh.c	usermodehelper: reset umask to default before executing user process	2020-10-14 10:31:21 +02:00
up.c
user_namespace.c	userns: also map extents in the reverse map to kernel IDs	2018-11-13 11:09:00 -08:00
user-return-notifier.c
user.c	userns: use irqsave variant of refcount_dec_and_lock()	2018-08-22 10:52:47 -07:00
utsname_sysctl.c	sys: don't hold uts_sem while accessing userspace memory	2018-08-11 02:05:53 -05:00
utsname.c
watchdog_hld.c	watchdog: Mark watchdog touch functions as notrace	2018-08-30 12:56:40 +02:00
watchdog.c	watchdog/softlockup: Enforce that timestamp is valid on boot	2020-02-24 08:34:49 +01:00
workqueue_internal.h
workqueue.c	workqueue: don't use wq_select_unbound_cpu() for bound works	2020-03-18 07:14:20 +01:00