From: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Date: Wed, 9 Jan 2019 13:00:03 +0100
Subject: s390/smp: fix CPU hotplug deadlock with CPU rescan
Git-commit: b7cb707c373094ce4008d4a6ac9b6b366ec52da5
Patch-mainline: v5.0 or v5.0-rc3 (next release)
References: git-fixes
smp_rescan_cpus() is called without the device_hotplug_lock, which can lead
to a dedlock when a new CPU is found and immediately set online by a udev
rule.
This was observed on an older kernel version, where the cpu_hotplug_begin()
loop was still present, and it resulted in hanging chcpu and systemd-udev
processes. This specific deadlock will not show on current kernels. However,
there may be other possible deadlocks, and since smp_rescan_cpus() can still
trigger a CPU hotplug operation, the device_hotplug_lock should be held.
For reference, this was the deadlock with the old cpu_hotplug_begin() loop:
chcpu (rescan) systemd-udevd
echo 1 > /sys/../rescan
-> smp_rescan_cpus()
-> (*) get_online_cpus()
(increases refcount)
-> smp_add_present_cpu()
(new CPU found)
-> register_cpu()
-> device_add()
-> udev "add" event triggered -----------> udev rule sets CPU online
-> echo 1 > /sys/.../online
-> lock_device_hotplug_sysfs()
(this is missing in rescan path)
-> device_online()
-> (**) device_lock(new CPU dev)
-> cpu_up()
-> cpu_hotplug_begin()
(loops until refcount == 0)
-> deadlock with (*)
-> bus_probe_device()
-> device_attach()
-> device_lock(new CPU dev)
-> deadlock with (**)
Fix this by taking the device_hotplug_lock in the CPU rescan path.
Cc: <stable@vger.kernel.org>
Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
[ ptesarik: Context adjusted, because SLE15 does not contain upstream
commit 6cbaefb4bf2ce6746e49c972289702133b347ffa. ]
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
arch/s390/kernel/smp.c | 4 ++++
drivers/s390/char/sclp_config.c | 2 ++
2 files changed, 6 insertions(+)
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -1163,7 +1163,11 @@ static ssize_t __ref rescan_store(struct
{
int rc;
+ rc = lock_device_hotplug_sysfs();
+ if (rc)
+ return rc;
rc = smp_rescan_cpus();
+ unlock_device_hotplug();
return rc ? rc : count;
}
static DEVICE_ATTR(rescan, 0200, NULL, rescan_store);
--- a/drivers/s390/char/sclp_config.c
+++ b/drivers/s390/char/sclp_config.c
@@ -59,7 +59,9 @@ static void sclp_cpu_capability_notify(s
static void __ref sclp_cpu_change_notify(struct work_struct *work)
{
+ lock_device_hotplug();
smp_rescan_cpus();
+ unlock_device_hotplug();
}
static void sclp_conf_receiver_fn(struct evbuf_header *evbuf)