Luis Chamberlain 8660484ed1 module: add debugging auto-load duplicate module support ... The finit_module() system call can in the worst case use up to more than twice of a module's size in virtual memory. Duplicate finit_module() system calls are non fatal, however they unnecessarily strain virtual memory during bootup and in the worst case can cause a system to fail to boot. This is only known to currently be an issue on systems with larger number of CPUs. To help debug this situation we need to consider the different sources for finit_module(). Requests from the kernel that rely on module auto-loading, ie, the kernel's *request_module() API, are one source of calls. Although modprobe checks to see if a module is already loaded prior to calling finit_module() there is a small race possible allowing userspace to trigger multiple modprobe calls racing against modprobe and this not seeing the module yet loaded. This adds debugging support to the kernel module auto-loader (*request_module() calls) to easily detect duplicate module requests. To aid with possible bootup failure issues incurred by this, it will converge duplicates requests to a single request. This avoids any possible strain on virtual memory during bootup which could be incurred by duplicate module autoloading requests. Folks debugging virtual memory abuse on bootup can and should enable this to see what pr_warn()s come on, to see if module auto-loading is to blame for their wores. If they see duplicates they can further debug this by enabling the module.enable_dups_trace kernel parameter or by enabling CONFIG_MODULE_DEBUG_AUTOLOAD_DUPS_TRACE. Current evidence seems to point to only a few duplicates for module auto-loading. And so the source for other duplicates creating heavy virtual memory pressure due to larger number of CPUs should becoming from another place (likely udev). Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>		2023-04-19 17:26:01 -07:00
..
bpf	- Daniel Verkamp has contributed a memfd series ("mm/memfd: add	2023-02-23 17:09:35 -08:00
cgroup	Networking changes for 6.3.	2023-02-21 18:24:12 -08:00
configs	mm, slob: rename CONFIG_SLOB to CONFIG_SLOB_DEPRECATED	2022-12-01 00:09:20 +01:00
debug	kdb: use srcu console list iterator	2022-12-02 11:25:00 +01:00
dma	dma-mapping: benchmark: remove MODULE_LICENSE in non-modules	2023-04-13 13:13:51 -07:00
entry	entry: kmsan: introduce kmsan_unpoison_entry_regs()	2022-10-03 14:03:25 -07:00
events	perf/hw_breakpoint: remove MODULE_LICENSE in non-modules	2023-04-13 13:13:52 -07:00
futex	- Prevent the leaking of a debug timer in futex_waitv()	2023-01-01 11:15:05 -08:00
gcov	gcov: add support for checksum field	2022-12-21 14:31:52 -08:00
irq	A set of updates for the interrupt susbsystem:	2023-03-05 11:19:16 -08:00
kcsan	kcsan: test: don't put the expect array on the stack	2023-01-02 08:59:33 -08:00
livepatch	kallsyms: Delete an unused parameter related to {module_}kallsyms_on_each_symbol()	2023-03-19 13:27:19 -07:00
locking	RCU pull request for v6.3	2023-02-21 10:45:51 -08:00
module	module: add debugging auto-load duplicate module support	2023-04-19 17:26:01 -07:00
power	Merge branches 'powercap', 'pm-domains', 'pm-em' and 'pm-opp'	2023-02-15 20:06:26 +01:00
printk	Change DEFINE_SEMAPHORE() to take a number argument	2023-04-18 11:15:24 -07:00
rcu	Merge branch 'stall.2023.01.09a' into HEAD	2023-02-02 16:40:07 -08:00
sched	More power management updates for 6.3-rc1	2023-03-03 10:30:58 -08:00
time	Updates for timekeeping, timers and clockevent/source drivers:	2023-02-21 09:45:13 -08:00
trace	rv/reactor: remove MODULE_LICENSE in non-modules	2023-04-13 13:13:53 -07:00
.gitignore
acct.c	acct: fix potential integer overflow in encode_comp_t()	2022-11-30 16:13:18 -08:00
async.c
audit_fsnotify.c	audit: fix potential double free on error path from fsnotify_add_inode_mark	2022-08-22 18:50:06 -04:00
audit_tree.c	audit: use fsnotify group lock helpers	2022-04-25 14:37:28 +02:00
audit_watch.c	audit_init_parent(): constify path	2022-09-01 17:39:30 -04:00
audit.c	audit: use time_after to compare time	2022-08-29 19:47:03 -04:00
audit.h	audit: remove selinux_audit_rule_update() declaration	2022-09-07 11:30:15 -04:00
auditfilter.c
auditsc.c	capability: just use a 'u64' instead of a 'u32[2]' array	2023-03-01 10:01:22 -08:00
backtracetest.c
bounds.c	mm: multi-gen LRU: minimal implementation	2022-09-26 19:46:09 -07:00
capability.c	capability: just use a 'u64' instead of a 'u32[2]' array	2023-03-01 10:01:22 -08:00
cfi.c	cfi: Switch to -fsanitize=kcfi	2022-09-26 10:13:13 -07:00
compat.c
configs.c
context_tracking.c	context_tracking: Fix noinstr vs KASAN	2023-01-13 11:48:18 +01:00
cpu_pm.c	cpuidle, cpu_pm: Remove RCU fiddling from cpu_pm_{enter,exit}()	2023-01-13 11:48:15 +01:00
cpu.c	cpu/hotplug: Do not bail-out in DYING/STARTING sections	2022-12-02 12:43:02 +01:00
crash_core.c	mm: remove 'First tail page' members from struct page	2023-02-02 22:32:59 -08:00
crash_dump.c
cred.c	cred: Do not default to init_cred in prepare_kernel_cred()	2022-11-01 10:04:52 -07:00
delayacct.c	delayacct: support re-entrance detection of thrashing accounting	2022-09-26 19:46:07 -07:00
dma.c
exec_domain.c
exit.c	arm64 updates for 6.3:	2023-02-21 15:27:48 -08:00
extable.c	context_tracking: Take NMI eqs entrypoints over RCU	2022-07-05 13:32:59 -07:00
fail_function.c	kernel/fail_function: fix memory leak with using debugfs_lookup()	2023-02-08 13:36:22 +01:00
fork.c	- Daniel Verkamp has contributed a memfd series ("mm/memfd: add	2023-02-23 17:09:35 -08:00
freezer.c	freezer,sched: Rewrite core freezer logic	2022-09-07 21:53:50 +02:00
gen_kheaders.sh	kheaders: use standard naming for the temporary directory	2023-01-22 23:43:34 +09:00
groups.c	security: Add LSM hook to setgroups() syscall	2022-07-15 18:21:49 +00:00
hung_task.c	hung_task: print message when hung_task_warnings gets down to zero.	2023-02-09 17:03:20 -08:00
iomem.c
irq_work.c	irq_work: use kasan_record_aux_stack_noalloc() record callstack	2022-04-15 14:49:55 -07:00
jump_label.c	jump_label: Prevent key->enabled int overflow	2022-12-01 15:53:05 -08:00
kallsyms_internal.h	kallsyms: Reduce the memory occupied by kallsyms_seqs_of_names[]	2022-11-12 18:47:36 -08:00
kallsyms_selftest.c	kallsyms: Delete an unused parameter related to {module_}kallsyms_on_each_symbol()	2023-03-19 13:27:19 -07:00
kallsyms_selftest.h	kallsyms: Add self-test facility	2022-11-15 00:42:02 -08:00
kallsyms.c	kallsyms: Delete an unused parameter related to {module_}kallsyms_on_each_symbol()	2023-03-19 13:27:19 -07:00
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt	Revert "signal, x86: Delay calling signals in atomic on RT enabled kernels"	2022-03-31 10:36:55 +02:00
kcov.c	mm: replace vma->vm_flags direct modifications with modifier calls	2023-02-09 16:51:39 -08:00
kexec_core.c	There is no particular theme here - mainly quick hits all over the tree.	2023-02-23 17:55:40 -08:00
kexec_elf.c
kexec_file.c	kexec: introduce sysctl parameters kexec_load_limit_*	2023-02-02 22:50:05 -08:00
kexec_internal.h	panic, kexec: make __crash_kexec() NMI safe	2022-09-11 21:55:06 -07:00
kexec.c	kexec: introduce sysctl parameters kexec_load_limit_*	2023-02-02 22:50:05 -08:00
kheaders.c
kprobes.c	x86/kprobes: Fix arch_check_optimized_kprobe check within optimized_kprobe range	2023-02-21 08:49:16 +09:00
ksysfs.c	kernels/ksysfs.c: export kernel address bits	2023-01-20 14:30:45 +01:00
kthread.c	kthread_worker: check all delayed works when destroy kthread worker	2023-02-02 22:50:02 -08:00
latencytop.c	latencytop: use the last element of latency_record of system	2022-09-11 21:55:12 -07:00
Makefile	module: fold usermode helper kmod into modules directory	2023-03-24 11:33:08 -07:00
module_signature.c
notifier.c	kernel/notifier: Remove CONFIG_SRCU	2023-02-02 16:26:06 -08:00
nsproxy.c	fs/exec: switch timens when a task gets a new mm	2022-10-25 15:15:52 -07:00
padata.c	Kbuild updates for v6.2	2022-12-19 12:33:32 -06:00
panic.c	panic: fix the panic_print NMI backtrace setting	2023-03-02 21:54:23 -08:00
params.c	module: make module_ktype structure constant	2023-03-09 12:55:15 -08:00
pid_namespace.c	- Daniel Verkamp has contributed a memfd series ("mm/memfd: add	2023-02-23 17:09:35 -08:00
pid_sysctl.h	mm/memfd: add MFD_NOEXEC_SEAL and MFD_EXEC	2023-01-18 17:12:37 -08:00
pid.c	gfs2: Add glockfd debugfs file	2022-06-29 13:07:16 +02:00
profile.c	kernel/profile.c: simplify duplicated code in profile_setup()	2022-09-11 21:55:12 -07:00
ptrace.c	rseq: Introduce extensible rseq ABI	2022-12-27 12:52:10 +01:00
range.c
reboot.c	kernel/reboot: Add SYS_OFF_MODE_RESTART_PREPARE mode	2022-10-04 15:59:36 +02:00
regset.c
relay.c	mm: replace vma->vm_flags direct modifications with modifier calls	2023-02-09 16:51:39 -08:00
resource_kunit.c
resource.c	dax/kmem: Fix leak of memory-hotplug resources	2023-02-17 14:58:01 -08:00
rseq.c	rseq: Extend struct rseq with per-memory-map concurrency ID	2022-12-27 12:52:12 +01:00
scftorture.c	scftorture: Fix distribution of short handler delays	2022-04-11 17:07:29 -07:00
scs.c	scs: add support for dynamic shadow call stacks	2022-11-09 18:06:35 +00:00
seccomp.c	seccomp: fix kernel-doc function name warning	2023-01-13 17:01:06 -08:00
signal.c	sched: Introduce per-memory-map concurrency ID	2022-12-27 12:52:11 +01:00
smp.c	bitmap patches for v6.1-rc1	2022-10-10 12:49:34 -07:00
smpboot.c	smpboot: use atomic_try_cmpxchg in cpu_wait_death and cpu_report_death	2022-09-11 21:55:10 -07:00
smpboot.h
softirq.c	context_tracking: Take IRQ eqs entrypoints over RCU	2022-07-05 13:32:59 -07:00
stackleak.c	stackleak: add on/off stack variants	2022-05-08 01:33:09 -07:00
stacktrace.c
static_call_inline.c	static_call: Add call depth tracking support	2022-10-17 16:41:16 +02:00
static_call.c	static_call: Don't make __static_call_return0 static	2022-04-05 09:59:38 +02:00
stop_machine.c	Scheduler changes in this cycle were:	2022-05-24 11:11:13 -07:00
sys_ni.c	kernel/sys_ni: add compat entry for fadvise64_64	2022-08-20 15:17:45 -07:00
sys.c	- Daniel Verkamp has contributed a memfd series ("mm/memfd: add	2023-02-23 17:09:35 -08:00
sysctl-test.c	kernel/sysctl-test: use SYSCTL_{ZERO/ONE_HUNDRED} instead of i_{zero/one_hundred}	2022-09-08 16:56:45 -07:00
sysctl.c	sysctl: fix proc_dobool() usability	2023-02-21 13:34:07 -08:00
task_work.c	task_work: use try_cmpxchg in task_work_add, task_work_cancel_match and task_work_run	2022-09-11 21:55:10 -07:00
taskstats.c	genetlink: start to validate reserved header bytes	2022-08-29 12:47:15 +01:00
torture.c	torture: Fix hang during kthread shutdown phase	2023-01-05 12:10:35 -08:00
tracepoint.c	tracepoint: Allow livepatch module add trace event	2023-02-18 14:34:36 -05:00
tsacct.c	taskstats: version 12 with thread group and exe info	2022-04-29 14:38:03 -07:00
ucount.c	ucounts: Split rlimit and ucount values and max values	2022-05-18 18:24:57 -05:00
uid16.c
uid16.h
umh.c	umh: simplify the capability pointer logic	2023-03-03 16:18:19 -08:00
up.c
user_namespace.c	userns: fix a struct's kernel-doc notation	2023-02-02 22:50:04 -08:00
user-return-notifier.c
user.c	kernel/user: Allow user_struct::locked_vm to be usable for iommufd	2022-11-30 20:16:49 -04:00
usermode_driver.c	blob_to_mnt(): kern_unmount() is needed to undo kern_mount()	2022-05-19 23:25:47 -04:00
utsname_sysctl.c	kernel/utsname_sysctl.c: Fix hostname polling	2022-10-23 12:01:01 -07:00
utsname.c
watch_queue.c	watch_queue: remove MODULE_LICENSE in non-modules	2023-04-13 13:13:54 -07:00
watchdog_hld.c	Revert "printk: add functions to prefer direct printing"	2022-06-23 18:41:40 +02:00
watchdog.c	powerpc updates for 6.0	2022-08-06 16:38:17 -07:00
workqueue_internal.h
workqueue.c	workqueue: Fold rebind_worker() within rebind_workers()	2023-01-13 07:50:40 -10:00