The patch titled
Subject: fork: report pid exhaustion correctly
has been removed from the -mm tree. Its filename was
fork-report-pid-exhaustion-correctly.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: KJ Tsanaktsidis <ktsanaktsidis(a)zendesk.com>
Subject: fork: report pid exhaustion correctly
Make the clone and fork syscalls return EAGAIN when the limit on the
number of pids /proc/sys/kernel/pid_max is exceeded.
Currently, when the pid_max limit is exceeded, the kernel will return
ENOSPC from the fork and clone syscalls. This is contrary to the
documented behaviour, which explicitly calls out the pid_max case as one
where EAGAIN should be returned. It also leads to really confusing error
messages in userspace programs which will complain about a lack of disk
space when they fail to create processes/threads for this reason.
This error is being returned because alloc_pid() uses the idr api to find
a new pid; when there are none available, idr_alloc_cyclic() returns
-ENOSPC, and this is being propagated back to userspace.
This behaviour has been broken before, and was explicitly fixed in
commit 35f71bc0a09a ("fork: report pid reservation failure properly"),
so I think -EAGAIN is definitely the right thing to return in this case.
The current behaviour change dates from commit 95846ecf9dac ("pid:
replace pid bitmap implementation with IDR AIP") and was I believe
unintentional.
This patch has no impact on the case where allocating a pid fails because
the child reaper for the namespace is dead; that case will still return
-ENOMEM.
Link: http://lkml.kernel.org/r/20180903111016.46461-1-ktsanaktsidis@zendesk.com
Fixes: 95846ecf9dac ("pid: replace pid bitmap implementation with IDR AIP")
Signed-off-by: KJ Tsanaktsidis <ktsanaktsidis(a)zendesk.com>
Reviewed-by: Andrew Morton <akpm(a)linux-foundation.org>
Acked-by: Michal Hocko <mhocko(a)suse.com>
Cc: Gargi Sharma <gs051095(a)gmail.com>
Cc: Rik van Riel <riel(a)redhat.com>
Cc: Oleg Nesterov <oleg(a)redhat.com>
Cc: <stable(a)vger.kernel.org>
Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org>
---
diff -puN kernel/pid.c~fork-report-pid-exhaustion-correctly kernel/pid.c
--- a/kernel/pid.c~fork-report-pid-exhaustion-correctly
+++ a/kernel/pid.c
@@ -195,7 +195,7 @@ struct pid *alloc_pid(struct pid_namespa
idr_preload_end();
if (nr < 0) {
- retval = nr;
+ retval = (nr == -ENOSPC) ? -EAGAIN : nr;
goto out_free;
}
_
Patches currently in -mm which might be from ktsanaktsidis(a)zendesk.com are
While we currently grab a runtime PM ref in nouveau's normal connector
detection code, we apparently don't do this for MST. This means if we're
in a scenario where the GPU is suspended and userspace attempts to do a
connector probe on an MSTC connector, the probe will fail entirely due
to the DP aux channel and GPU not being woken up:
[ 316.633489] nouveau 0000:01:00.0: i2c: aux 000a: begin idle timeout ffffffff
[ 316.635713] nouveau 0000:01:00.0: i2c: aux 000a: begin idle timeout ffffffff
[ 316.637785] nouveau 0000:01:00.0: i2c: aux 000a: begin idle timeout ffffffff
...
So, grab a runtime PM ref here.
Signed-off-by: Lyude Paul <lyude(a)redhat.com>
Cc: stable(a)vger.kernel.org
---
drivers/gpu/drm/nouveau/dispnv50/disp.c | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c
index c94b7f42d62d..9da0bdfe1e1c 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/disp.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c
@@ -938,9 +938,22 @@ static enum drm_connector_status
nv50_mstc_detect(struct drm_connector *connector, bool force)
{
struct nv50_mstc *mstc = nv50_mstc(connector);
+ enum drm_connector_status conn_status;
+ int ret;
+
if (!mstc->port)
return connector_status_disconnected;
- return drm_dp_mst_detect_port(connector, mstc->port->mgr, mstc->port);
+
+ ret = pm_runtime_get_sync(connector->dev->dev);
+ if (ret < 0 && ret != -EACCES)
+ return connector_status_disconnected;
+
+ conn_status = drm_dp_mst_detect_port(connector, mstc->port->mgr,
+ mstc->port);
+
+ pm_runtime_mark_last_busy(connector->dev->dev);
+ pm_runtime_put_autosuspend(connector->dev->dev);
+ return conn_status;
}
static void
--
2.17.1
Hi,
[This is an automated email]
This commit has been processed because it contains a -stable tag.
The stable tag indicates that it's relevant for the following trees: all
The bot has tested the following trees: v4.18.8, v4.14.70, v4.9.127, v4.4.156, v3.18.122,
v4.18.8: Build OK!
v4.14.70: Failed to apply! Possible dependencies:
22aac3eb0c46 ("MAINTAINERS: add entry for STM32 I2C driver")
v4.9.127: Failed to apply! Possible dependencies:
22aac3eb0c46 ("MAINTAINERS: add entry for STM32 I2C driver")
78f839029e1d ("iio: distance: srf08: add IIO driver for us ranger")
v4.4.156: Failed to apply! Possible dependencies:
22aac3eb0c46 ("MAINTAINERS: add entry for STM32 I2C driver")
78f839029e1d ("iio: distance: srf08: add IIO driver for us ranger")
v3.18.122: Failed to apply! Possible dependencies:
22aac3eb0c46 ("MAINTAINERS: add entry for STM32 I2C driver")
4193c0f1d863 ("iio: driver for Semtech SX9500 proximity solution")
78f839029e1d ("iio: distance: srf08: add IIO driver for us ranger")
Please let us know how to resolve this.
--
Thanks,
Sasha
On little endian platforms, csum_ipv6_magic() keeps len and proto in
CPU byte order. This generates a bad results leading to ICMPv6 packets
from other hosts being dropped by powerpc64le platforms.
In order to fix this, len and proto should be converted to network
byte order ie bigendian byte order. However checksumming 0x12345678
and 0x56341278 provide the exact same result so it is enough to
rotate the sum of len and proto by 1 byte.
PPC32 only support bigendian so the fix is needed for PPC64 only
Fixes: e9c4943a107b ("powerpc: Implement csum_ipv6_magic in assembly")
Reported-by: Jianlin Shi <jishi(a)redhat.com>
Reported-by: Xin Long <lucien.xin(a)gmail.com>
Cc: <stable(a)vger.kernel.org> # 4.18+
Signed-off-by: Christophe Leroy <christophe.leroy(a)c-s.fr>
---
arch/powerpc/lib/checksum_64.S | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/powerpc/lib/checksum_64.S b/arch/powerpc/lib/checksum_64.S
index 886ed94b9c13..2a68c43e13f5 100644
--- a/arch/powerpc/lib/checksum_64.S
+++ b/arch/powerpc/lib/checksum_64.S
@@ -443,6 +443,9 @@ _GLOBAL(csum_ipv6_magic)
addc r0, r8, r9
ld r10, 0(r4)
ld r11, 8(r4)
+#ifndef CONFIG_CPU_BIG_ENDIAN
+ rotldi r5, r5, 8
+#endif
adde r0, r0, r10
add r5, r5, r7
adde r0, r0, r11
--
2.13.3