https://github.com/torvalds/linux
Revision e45cc288724f0cfd497bb5920bcfa60caa335729 authored by Maurizio Lombardi on 19 September 2022, 16:39:29 UTC, committed by Vlastimil Babka on 22 September 2022, 19:48:48 UTC
Commit 5a836bf6b09f ("mm: slub: move flush_cpu_slab() invocations __free_slab() invocations out of IRQ context") moved all flush_cpu_slab() invocations to the global workqueue to avoid a problem related with deactivate_slab()/__free_slab() being called from an IRQ context on PREEMPT_RT kernels. When the flush_all_cpu_locked() function is called from a task context it may happen that a workqueue with WQ_MEM_RECLAIM bit set ends up flushing the global workqueue, this will cause a dependency issue. workqueue: WQ_MEM_RECLAIM nvme-delete-wq:nvme_delete_ctrl_work [nvme_core] is flushing !WQ_MEM_RECLAIM events:flush_cpu_slab WARNING: CPU: 37 PID: 410 at kernel/workqueue.c:2637 check_flush_dependency+0x10a/0x120 Workqueue: nvme-delete-wq nvme_delete_ctrl_work [nvme_core] RIP: 0010:check_flush_dependency+0x10a/0x120[ 453.262125] Call Trace: __flush_work.isra.0+0xbf/0x220 ? __queue_work+0x1dc/0x420 flush_all_cpus_locked+0xfb/0x120 __kmem_cache_shutdown+0x2b/0x320 kmem_cache_destroy+0x49/0x100 bioset_exit+0x143/0x190 blk_release_queue+0xb9/0x100 kobject_cleanup+0x37/0x130 nvme_fc_ctrl_free+0xc6/0x150 [nvme_fc] nvme_free_ctrl+0x1ac/0x2b0 [nvme_core] Fix this bug by creating a workqueue for the flush operation with the WQ_MEM_RECLAIM bit set. Fixes: 5a836bf6b09f ("mm: slub: move flush_cpu_slab() invocations __free_slab() invocations out of IRQ context") Cc: <stable@vger.kernel.org> Signed-off-by: Maurizio Lombardi <mlombard@redhat.com> Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
1 parent d71608a
Tip revision: e45cc288724f0cfd497bb5920bcfa60caa335729 authored by Maurizio Lombardi on 19 September 2022, 16:39:29 UTC
mm: slub: fix flush_cpu_slab()/__free_slab() invocations in task context.
mm: slub: fix flush_cpu_slab()/__free_slab() invocations in task context.
Tip revision: e45cc28
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.cocciconfig | -rw-r--r-- | 59 bytes |
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COPYING | -rw-r--r-- | 496 bytes |
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Makefile | -rw-r--r-- | 64.5 KB |
README | -rw-r--r-- | 727 bytes |
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