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Daniel Jordan 3e6c08dd97 padata: Put CPU offline callback in ONLINE section to allow failure 
[ Upstream commit c8c4a2972f ]

syzbot reported the following warning:

    DEAD callback error for CPU1
    WARNING: kernel/cpu.c:1463 at _cpu_down+0x759/0x1020 kernel/cpu.c:1463, CPU#0: syz.0.1960/14614

at commit 4ae12d8bd9 ("Merge tag 'kbuild-fixes-7.0-2' of git://git.kernel.org/pub/scm/linux/kernel/git/kbuild/linux")
which tglx traced to padata_cpu_dead() given it's the only
sub-CPUHP_TEARDOWN_CPU callback that returns an error.

Failure isn't allowed in hotplug states before CPUHP_TEARDOWN_CPU
so move the CPU offline callback to the ONLINE section where failure is
possible.

Fixes: 894c9ef978 ("padata: validate cpumask without removed CPU during offline")
Reported-by: syzbot+123e1b70473ce213f3af@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/all/69af0a05.050a0220.310d8.002f.GAE@google.com/
Debugged-by: Thomas Gleixner <tglx@kernel.org>
Signed-off-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2026-05-23 13:04:29 +02:00
..
bpf
bpf: Fix OOB in pcpu_init_value
2026-05-23 13:04:25 +02:00
cgroup
cgroup: fix race between task migration and iteration
2026-03-25 11:08:30 +01:00
configs
Remove WARN_ALL_UNSEEDED_RANDOM kernel config option
2026-03-04 07:21:32 -05:00
debug
…
dma
dma: swiotlb: add KMSAN annotations to swiotlb_bounce()
2026-04-02 13:09:31 +02:00
entry
…
events
kernel: be more careful about dup_mmap() failures and uprobe registering
2026-04-22 13:19:01 +02:00
futex
futex: Require sys_futex_requeue() to have identical flags
2026-04-02 13:09:54 +02:00
gcov
gcov: add support for GCC 15
2025-11-24 10:35:59 +01:00
irq
kexec: Consolidate machine_kexec_mask_interrupts() implementation
2026-03-25 11:08:25 +01:00
kcsan
kcsan: test: Initialize dummy variable
2025-08-15 12:13:46 +02:00
livepatch
livepatch: Match old_sympos 0 and 1 in klp_find_func()
2026-01-08 10:13:56 +01:00
locking
rtmutex: Use waiter::task instead of current in remove_waiter()
2026-05-07 06:09:43 +02:00
module
module: Fix freeing of charp module parameters when CONFIG_SYSFS=n
2026-05-23 13:04:21 +02:00
power
PM: hibernate: Drain trailing zero pages on userspace restore
2026-04-02 13:09:39 +02:00
printk
printk: nbcon: Allow reacquire during panic
2025-08-20 18:30:47 +02:00
rcu
rcu: Fix rcu_read_unlock() deadloop due to softirq
2026-03-04 07:19:21 -05:00
sched
sched: Use u64 for bandwidth ratio calculations
2026-05-07 06:09:30 +02:00
time
hrtimer: Reduce trace noise in hrtimer_start()
2026-05-23 13:04:21 +02:00
trace
tracing/probes: Limit size of event probe to 3K
2026-05-17 17:14:35 +02:00
.gitignore
…
acct.c
acct: block access to kernel internal filesystems
2025-02-27 04:30:23 -08:00
async.c
…
audit_fsnotify.c
…
audit_tree.c
…
audit_watch.c
…
audit.c
…
audit.h
audit,module: restore audit logging in load failure case
2025-08-15 12:13:31 +02:00
auditfilter.c
…
auditsc.c
audit,module: restore audit logging in load failure case
2025-08-15 12:13:31 +02:00
backtracetest.c
…
bounds.c
…
capability.c
…
cfi.c
…
compat.c
…
configs.c
…
context_tracking.c
…
cpu_pm.c
…
cpu.c
watchdog/hardlockup/perf: Fix perf_event memory leak
2025-04-10 14:39:11 +02:00
crash_core.c
crash: fix crashkernel resource shrink
2025-11-24 10:36:01 +01:00
crash_reserve.c
…
cred.c
…
delayacct.c
…
dma.c
…
elfcorehdr.c
…
exec_domain.c
…
exit.c
ptrace: slightly saner 'get_dumpable()' logic
2026-05-15 14:51:08 +02:00
exit.h
…
extable.c
…
fail_function.c
…
fork.c
mm: convert mm_lock_seq to a proper seqcount
2026-05-14 15:29:17 +02:00
freezer.c
sched,freezer: Remove unnecessary warning in __thaw_task
2025-07-24 08:56:37 +02:00
gen_kheaders.sh
kheaders: Ignore silly-rename files
2025-01-23 17:22:55 +01:00
groups.c
…
hung_task.c
…
iomem.c
…
irq_work.c
…
jump_label.c
…
kallsyms_internal.h
…
kallsyms_selftest.c
…
kallsyms_selftest.h
…
kallsyms.c
kallsyms/ftrace: set module buildid in ftrace_mod_address_lookup()
2026-03-04 07:20:02 -05:00
kcmp.c
…
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.kexec
crash, powerpc: default to CRASH_DUMP=n on PPC_BOOK3S_32
2024-11-14 22:43:48 -08:00
Kconfig.locks
…
Kconfig.preempt
…
kcov.c
kcov: mark in_softirq_really() as __always_inline
2025-01-09 13:33:49 +01:00
kexec_core.c
kexec: define functions to map and unmap segments
2026-03-13 17:20:27 +01:00
kexec_elf.c
kexec: initialize ELF lowest address to ULONG_MAX
2025-04-10 14:39:24 +02:00
kexec_file.c
kexec: derive purgatory entry from symbol
2026-03-04 07:21:51 -05:00
kexec_internal.h
…
kexec.c
…
kheaders.c
…
kprobes.c
kprobes: Remove unneeded warnings from __arm_kprobe_ftrace()
2026-03-25 11:08:48 +01:00
ksyms_common.c
…
ksysfs.c
…
kthread.c
…
latencytop.c
…
Makefile
…
module_signature.c
…
notifier.c
…
nsproxy.c
…
padata.c
padata: Put CPU offline callback in ONLINE section to allow failure
2026-05-23 13:04:29 +02:00
panic.c
objtool, panic: Disable SMAP in __stack_chk_fail()
2025-05-02 07:59:19 +02:00
params.c
module: Fix freeing of charp module parameters when CONFIG_SYSFS=n
2026-05-23 13:04:21 +02:00
pid_namespace.c
…
pid_sysctl.h
…
pid.c
pid: Add a judgment for ns null in pid_nr_ns
2025-10-19 16:34:05 +02:00
profile.c
…
ptrace.c
ptrace: slightly saner 'get_dumpable()' logic
2026-05-15 14:51:08 +02:00
range.c
…
reboot.c
Flush console log from kernel_power_off()
2025-04-20 10:15:12 +02:00
regset.c
…
relay.c
…
resource_kunit.c
…
resource.c
Reinstate "resource: avoid unnecessary lookups in find_next_iomem_res()"
2025-12-18 13:55:11 +01:00
rseq.c
rseq: Clarify rseq registration rseq_size bound check comment
2026-03-13 17:20:17 +01:00
scftorture.c
…
scs.c
scs: fix a wrong parameter in __scs_magic
2026-01-08 10:14:21 +01:00
seccomp.c
seccomp: passthrough uprobe systemcall without filtering
2025-11-02 22:15:20 +09:00
signal.c
pidfs: improve multi-threaded exec and premature thread-group leader exit polling
2025-05-29 11:02:09 +02:00
smp.c
smp: Fix up and expand the smp_call_function_many() kerneldoc
2025-10-15 12:00:02 +02:00
smpboot.c
…
smpboot.h
…
softirq.c
lockdep: Fix wait context check on softirq for PREEMPT_RT
2025-05-29 11:02:08 +02:00
stackleak.c
…
stacktrace.c
…
static_call_inline.c
x86/static-call: provide a way to do very early static-call updates
2024-12-19 18:13:23 +01:00
static_call.c
…
stop_machine.c
sched/core: Fix migrate_swap() vs. hotplug
2025-07-17 18:37:03 +02:00
sys_ni.c
…
sys.c
kernel/sys.c: fix the racy usage of task_lock(tsk->group_leader) in sys_prlimit64() paths
2025-10-19 16:33:51 +02:00
sysctl-test.c
…
sysctl.c
sysctl: fix uninitialized variable in proc_do_large_bitmap
2026-04-02 13:09:40 +02:00
task_work.c
task_work: Fix NMI race condition
2025-12-18 13:54:50 +01:00
taskstats.c
taskstats: set version in TGID exit notifications
2026-05-07 06:09:40 +02:00
torture.c
…
tracepoint.c
tracepoint: balance regfunc() on func_add() failure in tracepoint_add_func()
2026-05-14 15:29:29 +02:00
tsacct.c
…
ucount.c
ucount: check for CAP_SYS_RESOURCE using ns_capable_noaudit()
2026-03-04 07:20:08 -05:00
uid16.c
…
uid16.h
…
umh.c
…
up.c
…
user_namespace.c
…
user-return-notifier.c
…
user.c
…
usermode_driver.c
…
utsname_sysctl.c
…
utsname.c
…
vhost_task.c
vhost: Take a reference on the task in struct vhost_task.
2025-10-02 13:44:10 +02:00
vmcore_info.c
…
watch_queue.c
watch_queue: fix pipe accounting mismatch
2025-04-10 14:39:10 +02:00
watchdog_buddy.c
…
watchdog_perf.c
watchdog/hardlockup/perf: Fix perf_event memory leak
2025-04-10 14:39:11 +02:00
watchdog.c
watchdog/softlockup: fix sample ring index wrap in need_counting_irqs()
2026-03-04 07:21:54 -05:00
workqueue_internal.h
…
workqueue.c
workqueue: Add pool_workqueue to pending_pwqs list when unplugging multiple inactive works
2026-04-18 10:41:56 +02:00