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MFV r283512:

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3599 dtrace_dynvar tail calls can blow stack
Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: Gordon Ross <gordon.ross@nexenta.com>
Approved by: Richard Lowe <richlowe@richlowe.net>
Author: Bryan Cantrill <bryan@joyent.com>

illumos/illumos-gate@d47448f09a
This commit is contained in:
Mark Johnston 2015-09-11 03:04:24 +00:00
commit 2275da185c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=287641
1 changed files with 3 additions and 3 deletions
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6
sys/cddl/contrib/opensolaris/uts/common/dtrace/dtrace.c
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@ -23,7 +23,7 @@
/*
* Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2013, Joyent, Inc. All rights reserved.
* Copyright (c) 2015, Joyent, Inc. All rights reserved.
* Copyright (c) 2012, 2014 by Delphix. All rights reserved.
*/
@ -2146,7 +2146,7 @@ dtrace_dynvar(dtrace_dstate_t *dstate, uint_t nkeys,
* this hash chain, or another CPU is deleting an element from this
* hash chain. The simplest way to deal with both of these cases
* (though not necessarily the most efficient) is to free our
* allocated block and tail-call ourselves. Note that the free is
* allocated block and re-attempt it all. Note that the free is
* to the dirty list and _not_ to the free list. This is to prevent
* races with allocators, above.
*/
@ -2159,7 +2159,7 @@ dtrace_dynvar(dtrace_dstate_t *dstate, uint_t nkeys,
dvar->dtdv_next = free;
} while (dtrace_casptr(&dcpu->dtdsc_dirty, free, dvar) != free);
return (dtrace_dynvar(dstate, nkeys, key, dsize, op, mstate, vstate));
goto top;
}
/*ARGSUSED*/