Add patches to fix soft lockup from elevator changes (rhbz 902012)
This commit is contained in:
Josh Boyer
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51825034b1
commit
049b5083cf
162
elevator-Fix-a-race-in-elevator-switching-and-md.patch
Normal file
162
elevator-Fix-a-race-in-elevator-switching-and-md.patch
Normal file
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Subject: [PATCH v2 1/2] elevator: Fix a race in elevator switching and md
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device initialization
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To: linux-kernel@vger.kernel.org
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From: Tomoki Sekiyama <tomoki.sekiyama@hds.com>
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Cc: axboe@kernel.dk, tj@kernel.org, seiji.aguchi@hds.com,
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vgoyal@redhat.com, majianpeng@gmail.com
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Date: Fri, 30 Aug 2013 18:47:07 -0400
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The soft lockup below happens at the boot time of the system using dm
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multipath and the udev rules to switch scheduler.
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[ 356.127001] BUG: soft lockup - CPU#3 stuck for 22s! [sh:483]
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[ 356.127001] RIP: 0010:[<ffffffff81072a7d>] [<ffffffff81072a7d>] lock_timer_base.isra.35+0x1d/0x50
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...
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[ 356.127001] Call Trace:
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[ 356.127001] [<ffffffff81073810>] try_to_del_timer_sync+0x20/0x70
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[ 356.127001] [<ffffffff8118b08a>] ? kmem_cache_alloc_node_trace+0x20a/0x230
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[ 356.127001] [<ffffffff810738b2>] del_timer_sync+0x52/0x60
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[ 356.127001] [<ffffffff812ece22>] cfq_exit_queue+0x32/0xf0
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[ 356.127001] [<ffffffff812c98df>] elevator_exit+0x2f/0x50
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[ 356.127001] [<ffffffff812c9f21>] elevator_change+0xf1/0x1c0
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[ 356.127001] [<ffffffff812caa50>] elv_iosched_store+0x20/0x50
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[ 356.127001] [<ffffffff812d1d09>] queue_attr_store+0x59/0xb0
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[ 356.127001] [<ffffffff812143f6>] sysfs_write_file+0xc6/0x140
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[ 356.127001] [<ffffffff811a326d>] vfs_write+0xbd/0x1e0
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[ 356.127001] [<ffffffff811a3ca9>] SyS_write+0x49/0xa0
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[ 356.127001] [<ffffffff8164e899>] system_call_fastpath+0x16/0x1b
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This is caused by a race between md device initialization by multipathd and
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shell script to switch the scheduler using sysfs.
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- multipathd:
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SyS_ioctl -> do_vfs_ioctl -> dm_ctl_ioctl -> ctl_ioctl -> table_load
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-> dm_setup_md_queue -> blk_init_allocated_queue -> elevator_init
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q->elevator = elevator_alloc(q, e); // not yet initialized
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- sh -c 'echo deadline > /sys/$DEVPATH/queue/scheduler':
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elevator_switch (in the call trace above)
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struct elevator_queue *old = q->elevator;
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q->elevator = elevator_alloc(q, new_e);
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elevator_exit(old); // lockup! (*)
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- multipathd: (cont.)
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err = e->ops.elevator_init_fn(q); // init fails; q->elevator is modified
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(*) When del_timer_sync() is called, lock_timer_base() will loop infinitely
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while timer->base == NULL. In this case, as timer will never initialized,
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it results in lockup.
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This patch introduces acquisition of q->sysfs_lock around elevator_init()
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into blk_init_allocated_queue(), to provide mutual exclusion between
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initialization of the q->scheduler and switching of the scheduler.
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This should fix this bugzilla:
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https://bugzilla.redhat.com/show_bug.cgi?id=902012
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Signed-off-by: Tomoki Sekiyama <tomoki.sekiyama@hds.com>
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---
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block/blk-core.c | 10 +++++++++-
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block/elevator.c | 6 ++++++
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2 files changed, 15 insertions(+), 1 deletion(-)
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diff --git a/block/blk-core.c b/block/blk-core.c
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index 93a18d1..2f6275f 100644
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--- a/block/blk-core.c
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+++ b/block/blk-core.c
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@@ -739,9 +739,17 @@ blk_init_allocated_queue(struct request_queue *q, request_fn_proc *rfn,
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q->sg_reserved_size = INT_MAX;
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+ /* Protect q->elevator from elevator_change */
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+ mutex_lock(&q->sysfs_lock);
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+
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/* init elevator */
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- if (elevator_init(q, NULL))
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+ if (elevator_init(q, NULL)) {
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+ mutex_unlock(&q->sysfs_lock);
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return NULL;
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+ }
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+
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+ mutex_unlock(&q->sysfs_lock);
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+
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return q;
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}
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EXPORT_SYMBOL(blk_init_allocated_queue);
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diff --git a/block/elevator.c b/block/elevator.c
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index 668394d..02d4390 100644
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--- a/block/elevator.c
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+++ b/block/elevator.c
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@@ -186,6 +186,12 @@ int elevator_init(struct request_queue *q, char *name)
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struct elevator_type *e = NULL;
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int err;
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+ /*
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+ * q->sysfs_lock must be held to provide mutual exclusion between
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+ * elevator_switch() and here.
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+ */
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+ lockdep_assert_held(&q->sysfs_lock);
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+
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if (unlikely(q->elevator))
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return 0;
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121
elevator-acquire-q-sysfs_lock-in-elevator_change.patch
Normal file
121
elevator-acquire-q-sysfs_lock-in-elevator_change.patch
Normal file
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Fri, 30 Aug 2013 18:47:17 -0400 (EDT)
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Subject: [PATCH v2 2/2] elevator: acquire q->sysfs_lock in elevator_change()
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To: linux-kernel@vger.kernel.org
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From: Tomoki Sekiyama <tomoki.sekiyama@hds.com>
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Cc: axboe@kernel.dk, tj@kernel.org, seiji.aguchi@hds.com,
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vgoyal@redhat.com, majianpeng@gmail.com
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Date: Fri, 30 Aug 2013 18:47:16 -0400
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Add locking of q->sysfs_lock into elevator_change() (an exported function)
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to ensure it is held to protect q->elevator from elevator_init(), even if
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elevator_change() is called from non-sysfs paths.
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sysfs path (elv_iosched_store) uses __elevator_change(), non-locking
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version, as the lock is already taken by elv_iosched_store().
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Signed-off-by: Tomoki Sekiyama <tomoki.sekiyama@hds.com>
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---
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block/elevator.c | 16 ++++++++++++++--
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1 file changed, 14 insertions(+), 2 deletions(-)
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diff --git a/block/elevator.c b/block/elevator.c
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index 02d4390..6d765f7 100644
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--- a/block/elevator.c
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+++ b/block/elevator.c
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@@ -965,7 +965,7 @@ fail_init:
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/*
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* Switch this queue to the given IO scheduler.
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*/
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-int elevator_change(struct request_queue *q, const char *name)
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+static int __elevator_change(struct request_queue *q, const char *name)
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{
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char elevator_name[ELV_NAME_MAX];
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struct elevator_type *e;
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@@ -987,6 +987,18 @@ int elevator_change(struct request_queue *q, const char *name)
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return elevator_switch(q, e);
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}
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+
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+int elevator_change(struct request_queue *q, const char *name)
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+{
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+ int ret;
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|
+
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||||||
|
+ /* Protect q->elevator from elevator_init() */
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||||||
|
+ mutex_lock(&q->sysfs_lock);
|
||||||
|
+ ret = __elevator_change(q, name);
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||||||
|
+ mutex_unlock(&q->sysfs_lock);
|
||||||
|
+
|
||||||
|
+ return ret;
|
||||||
|
+}
|
||||||
|
EXPORT_SYMBOL(elevator_change);
|
||||||
|
|
||||||
|
ssize_t elv_iosched_store(struct request_queue *q, const char *name,
|
||||||
|
@@ -997,7 +1009,7 @@ ssize_t elv_iosched_store(struct request_queue *q, const char *name,
|
||||||
|
if (!q->elevator)
|
||||||
|
return count;
|
||||||
|
|
||||||
|
- ret = elevator_change(q, name);
|
||||||
|
+ ret = __elevator_change(q, name);
|
||||||
|
if (!ret)
|
||||||
|
return count;
|
||||||
|
|
||||||
|
|
||||||
|
--
|
||||||
|
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
|
||||||
|
the body of a message to majordomo@vger.kernel.org
|
||||||
|
More majordomo info at http://vger.kernel.org/majordomo-info.html
|
||||||
|
Please read the FAQ at http://www.tux.org/lkml/
|
||||||
11
kernel.spec
11
kernel.spec
@ -743,6 +743,10 @@ Patch25108: Revert-rt2x00pci-Use-PCI-MSIs-whenever-possible.patch
|
|||||||
#rhbz 1008323
|
#rhbz 1008323
|
||||||
Patch25109: skge-fix-invalid-value-passed-to-pci_unmap_sigle.patch
|
Patch25109: skge-fix-invalid-value-passed-to-pci_unmap_sigle.patch
|
||||||
|
|
||||||
|
#rhbz 902012
|
||||||
|
Patch25114: elevator-Fix-a-race-in-elevator-switching-and-md.patch
|
||||||
|
Patch25115: elevator-acquire-q-sysfs_lock-in-elevator_change.patch
|
||||||
|
|
||||||
# END OF PATCH DEFINITIONS
|
# END OF PATCH DEFINITIONS
|
||||||
|
|
||||||
%endif
|
%endif
|
||||||
@ -1447,6 +1451,10 @@ ApplyPatch Revert-rt2x00pci-Use-PCI-MSIs-whenever-possible.patch
|
|||||||
#rhbz 1008323
|
#rhbz 1008323
|
||||||
ApplyPatch skge-fix-invalid-value-passed-to-pci_unmap_sigle.patch
|
ApplyPatch skge-fix-invalid-value-passed-to-pci_unmap_sigle.patch
|
||||||
|
|
||||||
|
#rhbz 902012
|
||||||
|
ApplyPatch elevator-Fix-a-race-in-elevator-switching-and-md.patch
|
||||||
|
ApplyPatch elevator-acquire-q-sysfs_lock-in-elevator_change.patch
|
||||||
|
|
||||||
# END OF PATCH APPLICATIONS
|
# END OF PATCH APPLICATIONS
|
||||||
|
|
||||||
%endif
|
%endif
|
||||||
@ -2251,6 +2259,9 @@ fi
|
|||||||
# ||----w |
|
# ||----w |
|
||||||
# || ||
|
# || ||
|
||||||
%changelog
|
%changelog
|
||||||
|
* Fri Sep 27 2013 Josh Boyer <jwboyer@fedoraproject.org>
|
||||||
|
- Add patches to fix soft lockup from elevator changes (rhbz 902012)
|
||||||
|
|
||||||
* Thu Sep 26 2013 Josh Boyer <jwboyer@fedoraproject.org> - 3.12.0-0.rc2.git2.1
|
* Thu Sep 26 2013 Josh Boyer <jwboyer@fedoraproject.org> - 3.12.0-0.rc2.git2.1
|
||||||
- Linux v3.12-rc2-83-g4b97280
|
- Linux v3.12-rc2-83-g4b97280
|
||||||
|
|
||||||
|
|||||||
Loading…
Reference in New Issue
Block a user