From: Richard Henderson <richard.henderson@linaro.org>
To: Andreas Schwab <schwab@suse.de>, qemu-devel@nongnu.org
Subject: Re: qemu-x86_64 runs out of memory
Date: Tue, 13 Sep 2022 11:53:22 +0100 [thread overview]
Message-ID: <c16ba95c-6a97-92cd-ee01-67f5fd0a65ff@linaro.org> (raw)
In-Reply-To: <mvmczbzty5j.fsf@suse.de>
On 9/13/22 10:35, Andreas Schwab wrote:
> $ cat mmap.c
> #include <stdio.h>
> #include <sys/mman.h>
>
> int
> main (void)
> {
> void *A;
> size_t L = 0, U, Max = 0;
> for (U = 1; ; U *= 2)
> {
> A = mmap (0, U, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE, -1, 0);
> if (A == (void *) -1)
> break;
> else
> munmap (A, U);
> }
> while (L + 1 < U)
> {
> size_t M = L + (U - L) / 2;
> A = mmap (0, M, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE, -1, 0);
> if (A == (void *) -1)
> U = M;
> else
> {
> Max = M;
> munmap(A, M);
> L = M;
> }
> }
> printf ("%zx\n", Max);
> }
> $ cc -O2 -g -Wall -std=gnu11 -g mmap.c -o mmap
> $ ./mmap
> 7f672e5ff000
> $ qemu-x86_64 ./mmap
> Killed
>
I suspect this is the same as
https://gitlab.com/qemu-project/qemu/-/issues/290
Needs a reorg of memory region tracking for {linux,bsd}-user.
r~
next prev parent reply other threads:[~2022-09-13 10:59 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-13 9:35 qemu-x86_64 runs out of memory Andreas Schwab
2022-09-13 10:53 ` Richard Henderson [this message]
2022-09-26 11:39 ` Li Zhang
2022-09-13 14:33 ` Alex Bennée
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