[{"id":1759840,"web_url":"http://patchwork.ozlabs.org/comment/1759840/","msgid":"","list_archive_url":null,"date":"2017-08-29T23:30:56","subject":"Re: [Qemu-devel] [PATCH] oslib-posix: Print errors before aborting\n\ton qemu_alloc_stack()","submitter":{"id":70924,"url":"http://patchwork.ozlabs.org/api/people/70924/","name":"Philippe Mathieu-Daudé","email":"f4bug@amsat.org"},"content":"On 08/29/2017 06:20 PM, Eduardo Habkost wrote:\n> If QEMU is running on a system that's out of memory and mmap()\n> fails, QEMU aborts with no error message at all, making it hard\n> to debug the reason for the failure.\n> \n> Add perror() calls that will print error information before\n> aborting.\n> \n> Signed-off-by: Eduardo Habkost \n\nReviewed-by: Philippe Mathieu-Daudé \nTested-by: Philippe Mathieu-Daudé \n\n> ---\n> util/oslib-posix.c | 2 ++\n> 1 file changed, 2 insertions(+)\n> \n> diff --git a/util/oslib-posix.c b/util/oslib-posix.c\n> index cacf0ef..80086c5 100644\n> --- a/util/oslib-posix.c\n> +++ b/util/oslib-posix.c\n> @@ -530,6 +530,7 @@ void *qemu_alloc_stack(size_t *sz)\n> ptr = mmap(NULL, *sz, PROT_READ | PROT_WRITE,\n> MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);\n> if (ptr == MAP_FAILED) {\n> + perror(\"failed to allocate memory for stack\");\n> abort();\n> }\n> \n> @@ -544,6 +545,7 @@ void *qemu_alloc_stack(size_t *sz)\n> guardpage = ptr;\n> #endif\n> if (mprotect(guardpage, pagesz, PROT_NONE) != 0) {\n> + perror(\"failed to set up stack guard page\");\n> abort();\n> }\n> \n>","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@bilbo.ozlabs.org","Authentication-Results":["ozlabs.org;\n\tspf=pass (mailfrom) smtp.mailfrom=nongnu.org\n\t(client-ip=2001:4830:134:3::11; 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Linux x86_64; rv:52.0) Gecko/20100101\n\tThunderbird/52.3.0","MIME-Version":"1.0","In-Reply-To":"<20170829212053.6003-1-ehabkost@redhat.com>","Content-Type":"text/plain; charset=utf-8; format=flowed","Content-Language":"en-US","Content-Transfer-Encoding":"8bit","X-detected-operating-system":"by eggs.gnu.org: Genre and OS details not\n\trecognized.","X-Received-From":"2607:f8b0:400d:c09::243","Subject":"Re: [Qemu-devel] [PATCH] oslib-posix: Print errors before aborting\n\ton qemu_alloc_stack()","X-BeenThere":"qemu-devel@nongnu.org","X-Mailman-Version":"2.1.21","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Cc":"Kevin Wolf , Stefan Hajnoczi ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"\"Qemu-devel\"\n\t"}},{"id":1759961,"web_url":"http://patchwork.ozlabs.org/comment/1759961/","msgid":"<20170830083339.GB24565@stefanha-x1.localdomain>","list_archive_url":null,"date":"2017-08-30T08:33:39","subject":"Re: [Qemu-devel] [PATCH] oslib-posix: Print errors before aborting\n\ton qemu_alloc_stack()","submitter":{"id":2747,"url":"http://patchwork.ozlabs.org/api/people/2747/","name":"Stefan Hajnoczi","email":"stefanha@gmail.com"},"content":"On Tue, Aug 29, 2017 at 06:20:53PM -0300, Eduardo Habkost wrote:\n> If QEMU is running on a system that's out of memory and mmap()\n> fails, QEMU aborts with no error message at all, making it hard\n> to debug the reason for the failure.\n> \n> Add perror() calls that will print error information before\n> aborting.\n> \n> Signed-off-by: Eduardo Habkost \n> ---\n> util/oslib-posix.c | 2 ++\n> 1 file changed, 2 insertions(+)\n\nReviewed-by: Stefan Hajnoczi ","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@bilbo.ozlabs.org","Authentication-Results":["ozlabs.org;\n\tspf=pass (mailfrom) smtp.mailfrom=nongnu.org\n\t(client-ip=2001:4830:134:3::11; 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charset=us-ascii","Content-Disposition":"inline","In-Reply-To":"<20170829212053.6003-1-ehabkost@redhat.com>","User-Agent":"Mutt/1.8.3 (2017-05-23)","X-detected-operating-system":"by eggs.gnu.org: Genre and OS details not\n\trecognized.","X-Received-From":"2a00:1450:400c:c09::242","Subject":"Re: [Qemu-devel] [PATCH] oslib-posix: Print errors before aborting\n\ton qemu_alloc_stack()","X-BeenThere":"qemu-devel@nongnu.org","X-Mailman-Version":"2.1.21","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Cc":"Kevin Wolf , qemu-devel@nongnu.org,\n\tStefan Hajnoczi ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"\"Qemu-devel\"\n\t"}},{"id":1759963,"web_url":"http://patchwork.ozlabs.org/comment/1759963/","msgid":"<20170830083354.GC24565@stefanha-x1.localdomain>","list_archive_url":null,"date":"2017-08-30T08:33:54","subject":"Re: [Qemu-devel] [PATCH] oslib-posix: Print errors before aborting\n\ton qemu_alloc_stack()","submitter":{"id":2747,"url":"http://patchwork.ozlabs.org/api/people/2747/","name":"Stefan Hajnoczi","email":"stefanha@gmail.com"},"content":"On Tue, Aug 29, 2017 at 06:20:53PM -0300, Eduardo Habkost wrote:\n> If QEMU is running on a system that's out of memory and mmap()\n> fails, QEMU aborts with no error message at all, making it hard\n> to debug the reason for the failure.\n> \n> Add perror() calls that will print error information before\n> aborting.\n> \n> Signed-off-by: Eduardo Habkost \n> ---\n> util/oslib-posix.c | 2 ++\n> 1 file changed, 2 insertions(+)\n\nThanks, applied to my block-next tree:\nhttps://github.com/stefanha/qemu/commits/block-next\n\nStefan","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@bilbo.ozlabs.org","Authentication-Results":["ozlabs.org;\n\tspf=pass (mailfrom) smtp.mailfrom=nongnu.org\n\t(client-ip=2001:4830:134:3::11; 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