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ef1ea98c8fffe227e5319215d84a53fa2a4bcebc
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Peter Zijlstra ef1ea98c8f task_work: Fix NMI race condition 
__schedule()
  // disable irqs
      <NMI>
	  task_work_add(current, work, TWA_NMI_CURRENT);
      </NMI>
  // current = next;
  // enable irqs
      <IRQ>
	  task_work_set_notify_irq()
	  test_and_set_tsk_thread_flag(current,
                                       TIF_NOTIFY_RESUME); // wrong task!
      </IRQ>
  // original task skips task work on its next return to user (or exit!)

Fixes: 466e4d801c ("task_work: Add TWA_NMI_CURRENT as an additional notify mode.")
Reported-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Link: https://patch.msgid.link/20250924080118.425949403@infradead.org
2025-10-29 10:29:54 +01:00
..
bpf
bpf: Avoid RCU context warning when unpinning htab with internal structs
2025-10-10 10:10:08 -07:00
cgroup
Merge tag 'rcu.2025.09.26a' of git://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux
2025-10-04 11:28:45 -07:00
configs
kcfi: Rename CONFIG_CFI_CLANG to CONFIG_CFI
2025-09-24 14:29:14 -07:00
debug
kdb: remove redundant check for scancode 0xe0
2025-09-20 21:19:09 +01:00
dma
Merge tag 'dma-mapping-6.18-2025-09-30' of git://git.kernel.org/pub/scm/linux/kernel/git/mszyprowski/linux
2025-10-03 17:41:12 -07:00
entry
Merge tag 'hyperv-next-signed-20251006' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux
2025-10-07 08:40:15 -07:00
events
Merge tag 'mm-stable-2025-10-01-19-00' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-10-02 18:18:33 -07:00
futex
Merge tag 'locking-futex-2025-09-29' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2025-09-30 16:07:10 -07:00
gcov
…
irq
Merge tag 'irq-core-2025-09-29' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2025-09-30 15:55:25 -07:00
kcsan
Merge tag 'kcsan-20250929-v6.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/melver/linux
2025-10-02 08:31:44 -07:00
livepatch
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locking
locking/local_lock: Introduce local_lock_is_locked().
2025-09-29 09:42:35 +02:00
module
kcfi: Rename CONFIG_CFI_CLANG to CONFIG_CFI
2025-09-24 14:29:14 -07:00
power
Merge branches 'pm-core', 'pm-runtime' and 'pm-sleep'
2025-09-29 12:54:01 +02:00
printk
Merge tag 'printk-for-6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux
2025-10-04 11:13:11 -07:00
rcu
Merge tag 'hyperv-next-signed-20251006' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux
2025-10-07 08:40:15 -07:00
sched
Merge tag 'mm-stable-2025-10-01-19-00' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-10-02 18:18:33 -07:00
time
Merge tag 'net-next-6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
2025-10-02 15:17:01 -07:00
trace
Merge tag 'trace-v6.18-3' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace
2025-10-11 16:06:04 -07:00
unwind
…
.gitignore
…
acct.c
kernel/acct.c: saner struct file treatment
2025-09-27 20:13:56 -04:00
async.c
…
audit_fsnotify.c
VFS/audit: introduce kern_path_parent() for audit
2025-09-23 12:37:35 +02:00
audit_tree.c
Merge tag 'pull-mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-10-03 10:19:44 -07:00
audit_watch.c
VFS/audit: introduce kern_path_parent() for audit
2025-09-23 12:37:35 +02:00
audit.c
audit: fix skb leak when audit rate limit is exceeded
2025-09-10 19:55:00 -04:00
audit.h
audit: create audit_stamp structure
2025-08-30 10:15:28 -04:00
auditfilter.c
Merge tag 'audit-pr-20250926' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit
2025-09-30 08:22:16 -07:00
auditsc.c
audit: add record for multiple object contexts
2025-08-30 10:15:30 -04:00
backtracetest.c
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bounds.c
…
capability.c
…
cfi.c
…
compat.c
…
configs.c
…
context_tracking.c
…
cpu_pm.c
…
cpu.c
…
crash_core_test.c
crash: add KUnit tests for crash_exclude_mem_range
2025-09-13 17:32:55 -07:00
crash_core.c
crash: add KUnit tests for crash_exclude_mem_range
2025-09-13 17:32:55 -07:00
crash_dump_dm_crypt.c
…
crash_reserve.c
…
cred.c
copy_process: pass clone_flags as u64 across calltree
2025-09-01 15:31:34 +02:00
delayacct.c
…
dma.c
…
elfcorehdr.c
…
exec_domain.c
…
exit.c
task_stack.h: clean-up stack_not_used() implementation
2025-09-21 14:22:00 -07:00
exit.h
…
extable.c
…
fail_function.c
…
fork.c
Merge tag 'mm-nonmm-stable-2025-10-02-15-29' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-10-02 18:44:54 -07:00
freezer.c
mm/oom_kill: thaw the entire OOM victim process
2025-09-21 14:22:35 -07:00
gen_kheaders.sh
…
groups.c
…
hung_task.c
hung_task: dump blocker task if it is not hung
2025-09-13 17:32:43 -07:00
iomem.c
…
irq_work.c
…
jump_label.c
…
kallsyms_internal.h
…
kallsyms_selftest.c
kallsyms: use kmalloc_array() instead of kmalloc()
2025-09-28 11:36:14 -07:00
kallsyms_selftest.h
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kallsyms.c
…
kcmp.c
…
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.kexec
crash: add KUnit tests for crash_exclude_mem_range
2025-09-13 17:32:55 -07:00
Kconfig.locks
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Kconfig.preempt
softirq: Allow to drop the softirq-BKL lock on PREEMPT_RT
2025-09-17 16:25:41 +02:00
kcov.c
kcov: use write memory barrier after memcpy() in kcov_move_area()
2025-09-13 17:32:44 -07:00
kexec_core.c
kexec_core: remove redundant 0 value initialization
2025-09-13 17:32:49 -07:00
kexec_elf.c
…
kexec_file.c
x86/kexec: carry forward the boot DTB on kexec
2025-09-13 17:32:43 -07:00
kexec_handover.c
kho: add support for preserving vmalloc allocations
2025-10-07 13:48:55 -07:00
kexec_internal.h
…
kexec.c
…
kheaders.c
…
kprobes.c
…
kstack_erase.c
…
ksyms_common.c
…
ksysfs.c
…
kthread.c
…
latencytop.c
…
Makefile
Merge tag 'mm-nonmm-stable-2025-10-02-15-29' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-10-02 18:44:54 -07:00
module_signature.c
…
notifier.c
…
nscommon.c
ns: drop assert
2025-09-25 09:23:54 +02:00
nsproxy.c
Merge tag 'namespace-6.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-09-29 11:20:29 -07:00
nstree.c
ns: move ns type into struct ns_common
2025-09-25 09:23:54 +02:00
padata.c
padata: WQ_PERCPU added to alloc_workqueue users
2025-09-13 12:11:06 +08:00
panic.c
panic: remove CONFIG_PANIC_ON_OOPS_VALUE
2025-09-28 11:36:13 -07:00
params.c
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pid_namespace.c
Merge tag 'namespace-6.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-09-29 11:20:29 -07:00
pid_sysctl.h
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pid.c
Merge tag 'namespace-6.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-09-29 11:20:29 -07:00
profile.c
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ptrace.c
…
range.c
…
reboot.c
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regset.c
…
relay.c
…
resource_kunit.c
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resource.c
resource: improve child resource handling in release_mem_region_adjustable()
2025-09-21 14:22:34 -07:00
rseq.c
rseq: Protect event mask against membarrier IPI
2025-09-13 19:51:59 +02:00
scftorture.c
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scs.c
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seccomp.c
Merge tag 'perf-core-2025-09-26' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2025-09-30 11:11:21 -07:00
signal.c
signal: Fix memory leak for PIDFD_SELF* sentinels
2025-08-19 13:51:28 +02:00
smp.c
smp: Fix up and expand the smp_call_function_many() kerneldoc
2025-09-18 22:21:28 +02:00
smpboot.c
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smpboot.h
…
softirq.c
softirq: Allow to drop the softirq-BKL lock on PREEMPT_RT
2025-09-17 16:25:41 +02:00
stacktrace.c
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static_call_inline.c
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static_call.c
…
stop_machine.c
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sys_ni.c
uprobes/x86: Add uprobe syscall to speed up uprobe
2025-08-21 20:09:20 +02:00
sys.c
Merge tag 'mm-nonmm-stable-2025-10-02-15-29' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-10-02 18:44:54 -07:00
sysctl-test.c
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sysctl.c
…
task_work.c
task_work: Fix NMI race condition
2025-10-29 10:29:54 +01:00
taskstats.c
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torture.c
…
tracepoint.c
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tsacct.c
pid: change bacct_add_tsk() to use task_ppid_nr_ns()
2025-08-19 13:38:20 +02:00
ucount.c
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uid16.c
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uid16.h
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umh.c
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up.c
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user_namespace.c
ns: move ns type into struct ns_common
2025-09-25 09:23:54 +02:00
user-return-notifier.c
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user.c
ns: move ns type into struct ns_common
2025-09-25 09:23:54 +02:00
utsname_sysctl.c
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utsname.c
Merge tag 'namespace-6.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-09-29 11:20:29 -07:00
vhost_task.c
vhost: Take a reference on the task in struct vhost_task.
2025-09-21 17:44:20 -04:00
vmcore_info.c
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watch_queue.c
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watchdog_buddy.c
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watchdog_perf.c
watchdog: skip checks when panic is in progress
2025-09-13 17:32:53 -07:00
watchdog.c
watchdog: skip checks when panic is in progress
2025-09-13 17:32:53 -07:00
workqueue_internal.h
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workqueue.c
workqueue: WQ_PERCPU added to alloc_workqueue users
2025-09-16 10:33:53 -10:00