* [Bug libc/13276] assertation failure in realloc when running out of virtual mappings
2011-10-08 16:24 [Bug libc/13276] New: assertation failure in realloc when running out of virtual mappings andi-bz at firstfloor dot org
@ 2011-10-08 18:40 ` bugdal at aerifal dot cx
2011-10-08 19:05 ` andi-bz at firstfloor dot org
` (5 subsequent siblings)
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From: bugdal at aerifal dot cx @ 2011-10-08 18:40 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=13276
Rich Felker <bugdal at aerifal dot cx> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |bugdal at aerifal dot cx
--- Comment #1 from Rich Felker <bugdal at aerifal dot cx> 2011-10-08 18:40:07 UTC ---
Making realloc fail in this case is not entirely a solution. The new memory has
already been allocated at this point, and the exact same error (inability to
munmap) could happen when trying to free this new allocation. (Maybe this isn't
possible, however, if the new allocation is either always on the heap or
performed atomically via mremap, i.e. if realloc never uses mmap+munmap.)
The most robust solution would be to ensure that each allocation is always its
own vma by putting guard pages between them, i.e. mmap(size+1page) with
PROT_NONE to begin with, then mmap size over top of that with MAP_FIXED.
Unfortunately this increases the kernelspace memory usage quite a bit (more
vmas) and adds an extra syscall to every allocation (probably an unacceptable
performance cost).
An alternative solution might be merge the region that munmap fails to free
into the free lists managed for non-mmap-serviced allocations.
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* [Bug libc/13276] assertation failure in realloc when running out of virtual mappings
2011-10-08 16:24 [Bug libc/13276] New: assertation failure in realloc when running out of virtual mappings andi-bz at firstfloor dot org
2011-10-08 18:40 ` [Bug libc/13276] " bugdal at aerifal dot cx
@ 2011-10-08 19:05 ` andi-bz at firstfloor dot org
2011-10-08 20:01 ` bugdal at aerifal dot cx
` (4 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: andi-bz at firstfloor dot org @ 2011-10-08 19:05 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=13276
--- Comment #2 from Andi Kleen <andi-bz at firstfloor dot org> 2011-10-08 19:04:31 UTC ---
I guess it would be reasonable to just leave the mapping around in this case
Normally the program will error out anyways when this happens, otherwise
it should happen rarely.
Just it shouldn't assertation failure.
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* [Bug libc/13276] assertation failure in realloc when running out of virtual mappings
2011-10-08 16:24 [Bug libc/13276] New: assertation failure in realloc when running out of virtual mappings andi-bz at firstfloor dot org
2011-10-08 18:40 ` [Bug libc/13276] " bugdal at aerifal dot cx
2011-10-08 19:05 ` andi-bz at firstfloor dot org
@ 2011-10-08 20:01 ` bugdal at aerifal dot cx
2011-10-08 20:01 ` bugdal at aerifal dot cx
` (3 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: bugdal at aerifal dot cx @ 2011-10-08 20:01 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=13276
--- Comment #3 from Rich Felker <bugdal at aerifal dot cx> 2011-10-08 20:01:02 UTC ---
Created attachment 5967
--> http://sourceware.org/bugzilla/attachment.cgi?id=5967
test case
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* [Bug libc/13276] assertation failure in realloc when running out of virtual mappings
2011-10-08 16:24 [Bug libc/13276] New: assertation failure in realloc when running out of virtual mappings andi-bz at firstfloor dot org
` (2 preceding siblings ...)
2011-10-08 20:01 ` bugdal at aerifal dot cx
@ 2011-10-08 20:01 ` bugdal at aerifal dot cx
2011-10-10 3:23 ` [Bug libc/13276] assertion " ppluzhnikov at google dot com
` (2 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: bugdal at aerifal dot cx @ 2011-10-08 20:01 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=13276
--- Comment #4 from Rich Felker <bugdal at aerifal dot cx> 2011-10-08 20:01:30 UTC ---
I can't reproduce the failure for realloc (calling realloc to resize a
mmap-sized block down to size 1 results in mremap to PAGE_SIZE rather than
servicing it from the heap), but I was able to reproduce it with free instead
of realloc. Test case is attached.
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* [Bug libc/13276] assertion failure in realloc when running out of virtual mappings
2011-10-08 16:24 [Bug libc/13276] New: assertation failure in realloc when running out of virtual mappings andi-bz at firstfloor dot org
` (3 preceding siblings ...)
2011-10-08 20:01 ` bugdal at aerifal dot cx
@ 2011-10-10 3:23 ` ppluzhnikov at google dot com
2011-10-29 20:40 ` drepper.fsp at gmail dot com
2014-06-27 11:53 ` fweimer at redhat dot com
6 siblings, 0 replies; 8+ messages in thread
From: ppluzhnikov at google dot com @ 2011-10-10 3:23 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=13276
Paul Pluzhnikov <ppluzhnikov at google dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |ppluzhnikov at google dot
| |com
Summary|assertation failure in |assertion failure in
|realloc when running out of |realloc when running out of
|virtual mappings |virtual mappings
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* [Bug libc/13276] assertion failure in realloc when running out of virtual mappings
2011-10-08 16:24 [Bug libc/13276] New: assertation failure in realloc when running out of virtual mappings andi-bz at firstfloor dot org
` (4 preceding siblings ...)
2011-10-10 3:23 ` [Bug libc/13276] assertion " ppluzhnikov at google dot com
@ 2011-10-29 20:40 ` drepper.fsp at gmail dot com
2014-06-27 11:53 ` fweimer at redhat dot com
6 siblings, 0 replies; 8+ messages in thread
From: drepper.fsp at gmail dot com @ 2011-10-29 20:40 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=13276
Ulrich Drepper <drepper.fsp at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
--- Comment #5 from Ulrich Drepper <drepper.fsp at gmail dot com> 2011-10-29 20:40:10 UTC ---
I checked in a patch.
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* [Bug libc/13276] assertion failure in realloc when running out of virtual mappings
2011-10-08 16:24 [Bug libc/13276] New: assertation failure in realloc when running out of virtual mappings andi-bz at firstfloor dot org
` (5 preceding siblings ...)
2011-10-29 20:40 ` drepper.fsp at gmail dot com
@ 2014-06-27 11:53 ` fweimer at redhat dot com
6 siblings, 0 replies; 8+ messages in thread
From: fweimer at redhat dot com @ 2014-06-27 11:53 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=13276
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Flags| |security-
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