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Fix dnode_hold_impl() soft lockup

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Soft lockups could happen when multiple threads trying
to get zrl on the same dnode handle in order to allocate
and initialize the dnode marked as DN_SLOT_ALLOCATED.

Don't loop from beginning when we can't get zrl, otherwise
we would increase the zrl refcount and nobody can actually
lock it.

Reviewed by: Tom Caputi <tcaputi@datto.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Li Dongyang <dongyangli@ddn.com>
Closes #8433
This commit is contained in:
lidongyang
2019-02-23 04:48:37 +11:00
committed by Brian Behlendorf
parent f8bb2a7e0c
commit 8d9e51c084
2 changed files with 53 additions and 56 deletions
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include/sys/zfs_context.h
+1
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@@ -236,6 +236,7 @@ extern kthread_t *zk_thread_create(void (*func)(void *), void *arg,
#define kpreempt_disable() ((void)0)
#define kpreempt_enable() ((void)0)
#define cond_resched() sched_yield()
/*
* Mutexes