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From: "Bulekov, Alexander" <alxndr@bu.edu>
To: "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>
Cc: "pbonzini@redhat.com" <pbonzini@redhat.com>,
	"bsd@redhat.com" <bsd@redhat.com>,
	"stefanha@redhat.com" <stefanha@redhat.com>,
	"Bulekov, Alexander" <alxndr@bu.edu>
Subject: [PATCH v8 13/21] main: keep rcu_atfork callback enabled for qtest
Date: Wed, 29 Jan 2020 05:34:22 +0000	[thread overview]
Message-ID: <20200129053357.27454-14-alxndr@bu.edu> (raw)
In-Reply-To: <20200129053357.27454-1-alxndr@bu.edu>

The qtest-based fuzzer makes use of forking to reset-state between
tests. Keep the callback enabled, so the call_rcu thread gets created
within the child process.

Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
---
 vl.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/vl.c b/vl.c
index bb77935f04..cf8e2d3ebb 100644
--- a/vl.c
+++ b/vl.c
@@ -3794,7 +3794,14 @@ void qemu_init(int argc, char **argv, char **envp)
     set_memory_options(&ram_slots, &maxram_size, machine_class);
 
     os_daemonize();
-    rcu_disable_atfork();
+
+    /*
+     * If QTest is enabled, keep the rcu_atfork enabled, since system processes
+     * may be forked testing purposes (e.g. fork-server based fuzzing)
+     */
+    if (!qtest_enabled()) {
+        rcu_disable_atfork();
+    }
 
     if (pid_file && !qemu_write_pidfile(pid_file, &err)) {
         error_reportf_err(err, "cannot create PID file: ");
-- 
2.23.0



  parent reply	other threads:[~2020-01-29  5:37 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-29  5:34 [PATCH v8 00/21] Add virtual device fuzzing support Bulekov, Alexander
2020-01-29  5:34 ` [PATCH v8 01/21] softmmu: split off vl.c:main() into main.c Bulekov, Alexander
2020-01-30 14:39   ` Stefan Hajnoczi
2020-01-30 15:06   ` Alex Bennée
2020-01-30 17:44     ` Alexander Bulekov
2020-01-30 18:41       ` Alex Bennée
2020-02-05 14:02   ` Darren Kenny
2020-01-29  5:34 ` [PATCH v8 02/21] module: check module wasn't already initialized Bulekov, Alexander
2020-01-29  5:34 ` [PATCH v8 03/21] fuzz: add FUZZ_TARGET module type Bulekov, Alexander
2020-02-05 11:28   ` Darren Kenny
2020-01-29  5:34 ` [PATCH v8 04/21] qtest: add qtest_server_send abstraction Bulekov, Alexander
2020-02-05 11:30   ` Darren Kenny
2020-01-29  5:34 ` [PATCH v8 05/21] libqtest: add a layer of abstraction to send/recv Bulekov, Alexander
2020-02-05 11:32   ` Darren Kenny
2020-01-29  5:34 ` [PATCH v8 06/21] libqtest: make bufwrite rely on the TransportOps Bulekov, Alexander
2020-02-05 11:36   ` Darren Kenny
2020-01-29  5:34 ` [PATCH v8 07/21] qtest: add in-process incoming command handler Bulekov, Alexander
2020-02-05 11:39   ` Darren Kenny
2020-01-29  5:34 ` [PATCH v8 08/21] libqos: rename i2c_send and i2c_recv Bulekov, Alexander
2020-02-05 11:40   ` Darren Kenny
2020-01-29  5:34 ` [PATCH v8 09/21] libqos: split qos-test and libqos makefile vars Bulekov, Alexander
2020-01-29  5:34 ` [PATCH v8 10/21] libqos: move useful qos-test funcs to qos_external Bulekov, Alexander
2020-01-29 10:03   ` Paolo Bonzini
2020-02-05 13:34   ` Darren Kenny
2020-01-29  5:34 ` [PATCH v8 11/21] fuzz: add fuzzer skeleton Bulekov, Alexander
2020-02-05 11:55   ` Darren Kenny
2020-01-29  5:34 ` [PATCH v8 12/21] exec: keep ram block across fork when using qtest Bulekov, Alexander
2020-02-05 13:00   ` Darren Kenny
2020-01-29  5:34 ` Bulekov, Alexander [this message]
2020-01-30 14:42   ` [PATCH v8 13/21] main: keep rcu_atfork callback enabled for qtest Stefan Hajnoczi
2020-01-30 17:24     ` Paolo Bonzini
2020-01-30 17:42       ` Alexander Bulekov
2020-01-30 18:14         ` Paolo Bonzini
2020-02-05 13:58   ` Darren Kenny
2020-06-18  7:34   ` Thomas Huth
2020-06-18 15:08     ` Alexander Bulekov
2020-01-29  5:34 ` [PATCH v8 14/21] fuzz: support for fork-based fuzzing Bulekov, Alexander
2020-01-29  5:34 ` [PATCH v8 16/21] fuzz: add target/fuzz makefile rules Bulekov, Alexander
2020-01-29  5:34 ` [PATCH v8 15/21] fuzz: add support for qos-assisted fuzz targets Bulekov, Alexander
2020-02-05 13:18   ` Darren Kenny
2020-02-11 16:19     ` Alexander Bulekov
2020-01-29  5:34 ` [PATCH v8 17/21] fuzz: add configure flag --enable-fuzzing Bulekov, Alexander
2020-02-05 13:19   ` Darren Kenny
2020-01-29  5:34 ` [PATCH v8 18/21] fuzz: add i440fx fuzz targets Bulekov, Alexander
2020-02-05 13:26   ` Darren Kenny
2020-02-06 14:47     ` Alexander Bulekov
2020-01-29  5:34 ` [PATCH v8 19/21] fuzz: add virtio-net fuzz target Bulekov, Alexander
2020-01-30 14:43   ` Stefan Hajnoczi
2020-02-05 13:57   ` Darren Kenny
2020-02-06 14:51     ` Alexander Bulekov
2020-01-29  5:34 ` [PATCH v8 20/21] fuzz: add virtio-scsi " Bulekov, Alexander
2020-02-05 13:31   ` Darren Kenny
2020-01-29  5:34 ` [PATCH v8 21/21] fuzz: add documentation to docs/devel/ Bulekov, Alexander
2020-02-05 13:33   ` Darren Kenny
2020-01-30 14:44 ` [PATCH v8 00/21] Add virtual device fuzzing support Stefan Hajnoczi

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