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e125fbeb53
This patch fixes an deadlock issue when dlm_lowcomms_close() is called. When dlm_lowcomms_close() is called the clusters_root.subsys.su_mutex is held to remove configfs items. At this time we flushing (e.g. cancel_work_sync()) the workers of send and recv workqueue. Due the fact that we accessing configfs items (mark values), these workers will lock clusters_root.subsys.su_mutex as well which are already hold by dlm_lowcomms_close() and ends in a deadlock situation. [67170.703046] ====================================================== [67170.703965] WARNING: possible circular locking dependency detected [67170.704758] 5.11.0-rc4+ #22 Tainted: G W [67170.705433] ------------------------------------------------------ [67170.706228] dlm_controld/280 is trying to acquire lock: [67170.706915] ffff9f2f475a6948 ((wq_completion)dlm_recv){+.+.}-{0:0}, at: __flush_work+0x203/0x4c0 [67170.708026] but task is already holding lock: [67170.708758] ffffffffa132f878 (&clusters_root.subsys.su_mutex){+.+.}-{3:3}, at: configfs_rmdir+0x29b/0x310 [67170.710016] which lock already depends on the new lock. The new behaviour adds the mark value to the node address configuration which doesn't require to held the clusters_root.subsys.su_mutex by accessing mark values in a separate datastructure. However the mark values can be set now only after a node address was set which is the case when the user is using dlm_controld. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com> |
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| .. | ||
| ast.c | ||
| ast.h | ||
| config.c | ||
| config.h | ||
| debug_fs.c | ||
| dir.c | ||
| dir.h | ||
| dlm_internal.h | ||
| Kconfig | ||
| lock.c | ||
| lock.h | ||
| lockspace.c | ||
| lockspace.h | ||
| lowcomms.c | ||
| lowcomms.h | ||
| lvb_table.h | ||
| main.c | ||
| Makefile | ||
| member.c | ||
| member.h | ||
| memory.c | ||
| memory.h | ||
| midcomms.c | ||
| midcomms.h | ||
| netlink.c | ||
| plock.c | ||
| rcom.c | ||
| rcom.h | ||
| recover.c | ||
| recover.h | ||
| recoverd.c | ||
| recoverd.h | ||
| requestqueue.c | ||
| requestqueue.h | ||
| user.c | ||
| user.h | ||
| util.c | ||
| util.h | ||