* [Qemu-devel] [Bug 883133] Re: qemu on ARM hosts asserts due to code buffer/libc heap conflict
[not found] <20111028150403.31257.25788.malonedeb@chaenomeles.canonical.com>
@ 2011-12-01 20:11 ` Natalia Portillo
2011-12-09 18:50 ` Dr. David Alan Gilbert
` (7 subsequent siblings)
8 siblings, 0 replies; 9+ messages in thread
From: Natalia Portillo @ 2011-12-01 20:11 UTC (permalink / raw)
To: qemu-devel
** Also affects: qemu
Importance: Undecided
Status: New
--
You received this bug notification because you are a member of qemu-
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https://bugs.launchpad.net/bugs/883133
Title:
qemu on ARM hosts asserts due to code buffer/libc heap conflict
Status in QEMU:
New
Status in Linaro QEMU:
New
Bug description:
On ARM hosts qemu (about half the time) asserts on startup:
qemu-system-i386: malloc.c:3096: sYSMALLOc: Assertion `(old_top == (((mbinptr) (((char *) &((av)->bins[((1) - 1) * 2])) -
__builtin_offsetof (struct malloc_chunk, fd)))) && old_size == 0) || ((unsigned long) (old_size) >= (unsigned long)((((__builtin_offsetof (struct malloc_chunk, fd_nextsize))+((2 * (sizeof(size_t))) - 1)) & ~((2 * (sizeof(size_t))) - 1))) && ((old_top)->size & 0x1) && ((unsigned long)old_end & pagemask) == 0)' failed.
This turns out to be because code_gen_alloc() is using mmap(MAP_FIXED)
to map the code buffer at address 0x01000000UL, which is in the area
glibc happens to be using for its heap. This tends to make the next
malloc() abort, although occasionally the stars align and we pass that
and fail weirdly later on.
I suspect we need to drop the MAP_FIXED requirement and fix the TCG code to cope with emitting code for longer-range
branches for calls to host fns etc (calls/branches within the generated code should be ok to keep using the short-range
branch insn I think). There is already no guarantee that the generated code and the host C code are within short
branch range of each other...
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/883133/+subscriptions
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Qemu-devel] [Bug 883133] Re: qemu on ARM hosts asserts due to code buffer/libc heap conflict
[not found] <20111028150403.31257.25788.malonedeb@chaenomeles.canonical.com>
2011-12-01 20:11 ` [Qemu-devel] [Bug 883133] Re: qemu on ARM hosts asserts due to code buffer/libc heap conflict Natalia Portillo
@ 2011-12-09 18:50 ` Dr. David Alan Gilbert
2011-12-15 10:21 ` Dr. David Alan Gilbert
` (6 subsequent siblings)
8 siblings, 0 replies; 9+ messages in thread
From: Dr. David Alan Gilbert @ 2011-12-09 18:50 UTC (permalink / raw)
To: qemu-devel
** Changed in: qemu-linaro
Assignee: (unassigned) => Dr. David Alan Gilbert (davidgil-uk)
** Changed in: qemu-linaro
Status: New => In Progress
--
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/883133
Title:
qemu on ARM hosts asserts due to code buffer/libc heap conflict
Status in QEMU:
New
Status in Linaro QEMU:
In Progress
Bug description:
On ARM hosts qemu (about half the time) asserts on startup:
qemu-system-i386: malloc.c:3096: sYSMALLOc: Assertion `(old_top == (((mbinptr) (((char *) &((av)->bins[((1) - 1) * 2])) -
__builtin_offsetof (struct malloc_chunk, fd)))) && old_size == 0) || ((unsigned long) (old_size) >= (unsigned long)((((__builtin_offsetof (struct malloc_chunk, fd_nextsize))+((2 * (sizeof(size_t))) - 1)) & ~((2 * (sizeof(size_t))) - 1))) && ((old_top)->size & 0x1) && ((unsigned long)old_end & pagemask) == 0)' failed.
This turns out to be because code_gen_alloc() is using mmap(MAP_FIXED)
to map the code buffer at address 0x01000000UL, which is in the area
glibc happens to be using for its heap. This tends to make the next
malloc() abort, although occasionally the stars align and we pass that
and fail weirdly later on.
I suspect we need to drop the MAP_FIXED requirement and fix the TCG code to cope with emitting code for longer-range
branches for calls to host fns etc (calls/branches within the generated code should be ok to keep using the short-range
branch insn I think). There is already no guarantee that the generated code and the host C code are within short
branch range of each other...
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/883133/+subscriptions
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Qemu-devel] [Bug 883133] Re: qemu on ARM hosts asserts due to code buffer/libc heap conflict
[not found] <20111028150403.31257.25788.malonedeb@chaenomeles.canonical.com>
2011-12-01 20:11 ` [Qemu-devel] [Bug 883133] Re: qemu on ARM hosts asserts due to code buffer/libc heap conflict Natalia Portillo
2011-12-09 18:50 ` Dr. David Alan Gilbert
@ 2011-12-15 10:21 ` Dr. David Alan Gilbert
2011-12-15 22:56 ` Peter Maydell
` (5 subsequent siblings)
8 siblings, 0 replies; 9+ messages in thread
From: Dr. David Alan Gilbert @ 2011-12-15 10:21 UTC (permalink / raw)
To: qemu-devel
Fix pushed into QEMU upstream today.
--
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/883133
Title:
qemu on ARM hosts asserts due to code buffer/libc heap conflict
Status in QEMU:
New
Status in Linaro QEMU:
In Progress
Bug description:
On ARM hosts qemu (about half the time) asserts on startup:
qemu-system-i386: malloc.c:3096: sYSMALLOc: Assertion `(old_top == (((mbinptr) (((char *) &((av)->bins[((1) - 1) * 2])) -
__builtin_offsetof (struct malloc_chunk, fd)))) && old_size == 0) || ((unsigned long) (old_size) >= (unsigned long)((((__builtin_offsetof (struct malloc_chunk, fd_nextsize))+((2 * (sizeof(size_t))) - 1)) & ~((2 * (sizeof(size_t))) - 1))) && ((old_top)->size & 0x1) && ((unsigned long)old_end & pagemask) == 0)' failed.
This turns out to be because code_gen_alloc() is using mmap(MAP_FIXED)
to map the code buffer at address 0x01000000UL, which is in the area
glibc happens to be using for its heap. This tends to make the next
malloc() abort, although occasionally the stars align and we pass that
and fail weirdly later on.
I suspect we need to drop the MAP_FIXED requirement and fix the TCG code to cope with emitting code for longer-range
branches for calls to host fns etc (calls/branches within the generated code should be ok to keep using the short-range
branch insn I think). There is already no guarantee that the generated code and the host C code are within short
branch range of each other...
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/883133/+subscriptions
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Qemu-devel] [Bug 883133] Re: qemu on ARM hosts asserts due to code buffer/libc heap conflict
[not found] <20111028150403.31257.25788.malonedeb@chaenomeles.canonical.com>
` (2 preceding siblings ...)
2011-12-15 10:21 ` Dr. David Alan Gilbert
@ 2011-12-15 22:56 ` Peter Maydell
2012-01-04 15:16 ` Peter Maydell
` (4 subsequent siblings)
8 siblings, 0 replies; 9+ messages in thread
From: Peter Maydell @ 2011-12-15 22:56 UTC (permalink / raw)
To: qemu-devel
** Changed in: qemu
Status: New => Fix Committed
--
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/883133
Title:
qemu on ARM hosts asserts due to code buffer/libc heap conflict
Status in QEMU:
Fix Committed
Status in Linaro QEMU:
In Progress
Bug description:
On ARM hosts qemu (about half the time) asserts on startup:
qemu-system-i386: malloc.c:3096: sYSMALLOc: Assertion `(old_top == (((mbinptr) (((char *) &((av)->bins[((1) - 1) * 2])) -
__builtin_offsetof (struct malloc_chunk, fd)))) && old_size == 0) || ((unsigned long) (old_size) >= (unsigned long)((((__builtin_offsetof (struct malloc_chunk, fd_nextsize))+((2 * (sizeof(size_t))) - 1)) & ~((2 * (sizeof(size_t))) - 1))) && ((old_top)->size & 0x1) && ((unsigned long)old_end & pagemask) == 0)' failed.
This turns out to be because code_gen_alloc() is using mmap(MAP_FIXED)
to map the code buffer at address 0x01000000UL, which is in the area
glibc happens to be using for its heap. This tends to make the next
malloc() abort, although occasionally the stars align and we pass that
and fail weirdly later on.
I suspect we need to drop the MAP_FIXED requirement and fix the TCG code to cope with emitting code for longer-range
branches for calls to host fns etc (calls/branches within the generated code should be ok to keep using the short-range
branch insn I think). There is already no guarantee that the generated code and the host C code are within short
branch range of each other...
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/883133/+subscriptions
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Qemu-devel] [Bug 883133] Re: qemu on ARM hosts asserts due to code buffer/libc heap conflict
[not found] <20111028150403.31257.25788.malonedeb@chaenomeles.canonical.com>
` (3 preceding siblings ...)
2011-12-15 22:56 ` Peter Maydell
@ 2012-01-04 15:16 ` Peter Maydell
2012-01-05 0:58 ` Michael Hope
` (3 subsequent siblings)
8 siblings, 0 replies; 9+ messages in thread
From: Peter Maydell @ 2012-01-04 15:16 UTC (permalink / raw)
To: qemu-devel
** Changed in: qemu-linaro
Status: In Progress => Fix Committed
--
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/883133
Title:
qemu on ARM hosts asserts due to code buffer/libc heap conflict
Status in QEMU:
Fix Committed
Status in Linaro QEMU:
Fix Committed
Bug description:
On ARM hosts qemu (about half the time) asserts on startup:
qemu-system-i386: malloc.c:3096: sYSMALLOc: Assertion `(old_top == (((mbinptr) (((char *) &((av)->bins[((1) - 1) * 2])) -
__builtin_offsetof (struct malloc_chunk, fd)))) && old_size == 0) || ((unsigned long) (old_size) >= (unsigned long)((((__builtin_offsetof (struct malloc_chunk, fd_nextsize))+((2 * (sizeof(size_t))) - 1)) & ~((2 * (sizeof(size_t))) - 1))) && ((old_top)->size & 0x1) && ((unsigned long)old_end & pagemask) == 0)' failed.
This turns out to be because code_gen_alloc() is using mmap(MAP_FIXED)
to map the code buffer at address 0x01000000UL, which is in the area
glibc happens to be using for its heap. This tends to make the next
malloc() abort, although occasionally the stars align and we pass that
and fail weirdly later on.
I suspect we need to drop the MAP_FIXED requirement and fix the TCG code to cope with emitting code for longer-range
branches for calls to host fns etc (calls/branches within the generated code should be ok to keep using the short-range
branch insn I think). There is already no guarantee that the generated code and the host C code are within short
branch range of each other...
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/883133/+subscriptions
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Qemu-devel] [Bug 883133] Re: qemu on ARM hosts asserts due to code buffer/libc heap conflict
[not found] <20111028150403.31257.25788.malonedeb@chaenomeles.canonical.com>
` (4 preceding siblings ...)
2012-01-04 15:16 ` Peter Maydell
@ 2012-01-05 0:58 ` Michael Hope
2012-01-05 16:03 ` Peter Maydell
` (2 subsequent siblings)
8 siblings, 0 replies; 9+ messages in thread
From: Michael Hope @ 2012-01-05 0:58 UTC (permalink / raw)
To: qemu-devel
** Changed in: qemu-linaro
Importance: Undecided => Medium
--
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/883133
Title:
qemu on ARM hosts asserts due to code buffer/libc heap conflict
Status in QEMU:
Fix Committed
Status in Linaro QEMU:
Fix Committed
Bug description:
On ARM hosts qemu (about half the time) asserts on startup:
qemu-system-i386: malloc.c:3096: sYSMALLOc: Assertion `(old_top == (((mbinptr) (((char *) &((av)->bins[((1) - 1) * 2])) -
__builtin_offsetof (struct malloc_chunk, fd)))) && old_size == 0) || ((unsigned long) (old_size) >= (unsigned long)((((__builtin_offsetof (struct malloc_chunk, fd_nextsize))+((2 * (sizeof(size_t))) - 1)) & ~((2 * (sizeof(size_t))) - 1))) && ((old_top)->size & 0x1) && ((unsigned long)old_end & pagemask) == 0)' failed.
This turns out to be because code_gen_alloc() is using mmap(MAP_FIXED)
to map the code buffer at address 0x01000000UL, which is in the area
glibc happens to be using for its heap. This tends to make the next
malloc() abort, although occasionally the stars align and we pass that
and fail weirdly later on.
I suspect we need to drop the MAP_FIXED requirement and fix the TCG code to cope with emitting code for longer-range
branches for calls to host fns etc (calls/branches within the generated code should be ok to keep using the short-range
branch insn I think). There is already no guarantee that the generated code and the host C code are within short
branch range of each other...
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/883133/+subscriptions
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Qemu-devel] [Bug 883133] Re: qemu on ARM hosts asserts due to code buffer/libc heap conflict
[not found] <20111028150403.31257.25788.malonedeb@chaenomeles.canonical.com>
` (5 preceding siblings ...)
2012-01-05 0:58 ` Michael Hope
@ 2012-01-05 16:03 ` Peter Maydell
2012-01-12 10:12 ` Peter Maydell
2012-07-10 14:54 ` Peter Maydell
8 siblings, 0 replies; 9+ messages in thread
From: Peter Maydell @ 2012-01-05 16:03 UTC (permalink / raw)
To: qemu-devel
NB: this would typically only happen when the ARM host had address space
randomization including brk randomization enabled (ie
/proc/sys/kernel/randomize_va_space is 2).
--
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/883133
Title:
qemu on ARM hosts asserts due to code buffer/libc heap conflict
Status in QEMU:
Fix Committed
Status in Linaro QEMU:
Fix Committed
Bug description:
On ARM hosts qemu (about half the time) asserts on startup:
qemu-system-i386: malloc.c:3096: sYSMALLOc: Assertion `(old_top == (((mbinptr) (((char *) &((av)->bins[((1) - 1) * 2])) -
__builtin_offsetof (struct malloc_chunk, fd)))) && old_size == 0) || ((unsigned long) (old_size) >= (unsigned long)((((__builtin_offsetof (struct malloc_chunk, fd_nextsize))+((2 * (sizeof(size_t))) - 1)) & ~((2 * (sizeof(size_t))) - 1))) && ((old_top)->size & 0x1) && ((unsigned long)old_end & pagemask) == 0)' failed.
This turns out to be because code_gen_alloc() is using mmap(MAP_FIXED)
to map the code buffer at address 0x01000000UL, which is in the area
glibc happens to be using for its heap. This tends to make the next
malloc() abort, although occasionally the stars align and we pass that
and fail weirdly later on.
I suspect we need to drop the MAP_FIXED requirement and fix the TCG code to cope with emitting code for longer-range
branches for calls to host fns etc (calls/branches within the generated code should be ok to keep using the short-range
branch insn I think). There is already no guarantee that the generated code and the host C code are within short
branch range of each other...
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/883133/+subscriptions
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Qemu-devel] [Bug 883133] Re: qemu on ARM hosts asserts due to code buffer/libc heap conflict
[not found] <20111028150403.31257.25788.malonedeb@chaenomeles.canonical.com>
` (6 preceding siblings ...)
2012-01-05 16:03 ` Peter Maydell
@ 2012-01-12 10:12 ` Peter Maydell
2012-07-10 14:54 ` Peter Maydell
8 siblings, 0 replies; 9+ messages in thread
From: Peter Maydell @ 2012-01-12 10:12 UTC (permalink / raw)
To: qemu-devel
** Changed in: qemu-linaro
Status: Fix Committed => Triaged
** Changed in: qemu-linaro
Status: Triaged => Fix Released
--
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/883133
Title:
qemu on ARM hosts asserts due to code buffer/libc heap conflict
Status in QEMU:
Fix Committed
Status in Linaro QEMU:
Fix Released
Bug description:
On ARM hosts qemu (about half the time) asserts on startup:
qemu-system-i386: malloc.c:3096: sYSMALLOc: Assertion `(old_top == (((mbinptr) (((char *) &((av)->bins[((1) - 1) * 2])) -
__builtin_offsetof (struct malloc_chunk, fd)))) && old_size == 0) || ((unsigned long) (old_size) >= (unsigned long)((((__builtin_offsetof (struct malloc_chunk, fd_nextsize))+((2 * (sizeof(size_t))) - 1)) & ~((2 * (sizeof(size_t))) - 1))) && ((old_top)->size & 0x1) && ((unsigned long)old_end & pagemask) == 0)' failed.
This turns out to be because code_gen_alloc() is using mmap(MAP_FIXED)
to map the code buffer at address 0x01000000UL, which is in the area
glibc happens to be using for its heap. This tends to make the next
malloc() abort, although occasionally the stars align and we pass that
and fail weirdly later on.
I suspect we need to drop the MAP_FIXED requirement and fix the TCG code to cope with emitting code for longer-range
branches for calls to host fns etc (calls/branches within the generated code should be ok to keep using the short-range
branch insn I think). There is already no guarantee that the generated code and the host C code are within short
branch range of each other...
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/883133/+subscriptions
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Qemu-devel] [Bug 883133] Re: qemu on ARM hosts asserts due to code buffer/libc heap conflict
[not found] <20111028150403.31257.25788.malonedeb@chaenomeles.canonical.com>
` (7 preceding siblings ...)
2012-01-12 10:12 ` Peter Maydell
@ 2012-07-10 14:54 ` Peter Maydell
8 siblings, 0 replies; 9+ messages in thread
From: Peter Maydell @ 2012-07-10 14:54 UTC (permalink / raw)
To: qemu-devel
** Changed in: qemu
Status: Fix Committed => Fix Released
--
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/883133
Title:
qemu on ARM hosts asserts due to code buffer/libc heap conflict
Status in QEMU:
Fix Released
Status in Linaro QEMU:
Fix Released
Bug description:
On ARM hosts qemu (about half the time) asserts on startup:
qemu-system-i386: malloc.c:3096: sYSMALLOc: Assertion `(old_top == (((mbinptr) (((char *) &((av)->bins[((1) - 1) * 2])) -
__builtin_offsetof (struct malloc_chunk, fd)))) && old_size == 0) || ((unsigned long) (old_size) >= (unsigned long)((((__builtin_offsetof (struct malloc_chunk, fd_nextsize))+((2 * (sizeof(size_t))) - 1)) & ~((2 * (sizeof(size_t))) - 1))) && ((old_top)->size & 0x1) && ((unsigned long)old_end & pagemask) == 0)' failed.
This turns out to be because code_gen_alloc() is using mmap(MAP_FIXED)
to map the code buffer at address 0x01000000UL, which is in the area
glibc happens to be using for its heap. This tends to make the next
malloc() abort, although occasionally the stars align and we pass that
and fail weirdly later on.
I suspect we need to drop the MAP_FIXED requirement and fix the TCG code to cope with emitting code for longer-range
branches for calls to host fns etc (calls/branches within the generated code should be ok to keep using the short-range
branch insn I think). There is already no guarantee that the generated code and the host C code are within short
branch range of each other...
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/883133/+subscriptions
^ permalink raw reply [flat|nested] 9+ messages in thread
end of thread, other threads:[~2012-07-10 15:01 UTC | newest]
Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
[not found] <20111028150403.31257.25788.malonedeb@chaenomeles.canonical.com>
2011-12-01 20:11 ` [Qemu-devel] [Bug 883133] Re: qemu on ARM hosts asserts due to code buffer/libc heap conflict Natalia Portillo
2011-12-09 18:50 ` Dr. David Alan Gilbert
2011-12-15 10:21 ` Dr. David Alan Gilbert
2011-12-15 22:56 ` Peter Maydell
2012-01-04 15:16 ` Peter Maydell
2012-01-05 0:58 ` Michael Hope
2012-01-05 16:03 ` Peter Maydell
2012-01-12 10:12 ` Peter Maydell
2012-07-10 14:54 ` Peter Maydell
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