faca92f2f1
First commit: Revert "Revert "ambe741d47: am2f460fbe: am73b5cad9: Merge "bionic: Fix wrong kernel_id in pthread descriptor after fork()""" This reverts commit06823da2f0. Second commit: bionic: fix atfork hanlder_mutex deadlock This cherry-picks commit34e89c232dAfter applying the kernel_id fix, the system refused to boot up and we got following crash log: I/DEBUG ( 113): pid: 618, tid: 618 >>> org.simalliance.openmobileapi.service:remote <<< I/DEBUG ( 113): signal 16 (SIGSTKFLT), code -6 (?), fault addr -------- I/DEBUG ( 113): eax fffffe00 ebx b77de994 ecx 00000080 edx 00724002 I/DEBUG ( 113): esi 00000000 edi 00004000 I/DEBUG ( 113): xcs 00000073 xds 0000007b xes 0000007b xfs 00000000 xss 0000007b I/DEBUG ( 113): eip b7761351 ebp bfdf3de8 esp bfdf3dc4 flags 00000202 I/DEBUG ( 113): #00 eip: 00015351 /system/lib/libc.so I/DEBUG ( 113): #01 eip: 0000d13c /system/lib/libc.so (pthread_mutex_lock) I/DEBUG ( 113): #02 eip: 00077b48 /system/lib/libc.so (__bionic_atfork_run_prepare) I/DEBUG ( 113): #03 eip: 00052cdb /system/lib/libc.so (fork) I/DEBUG ( 113): #04 eip: 0009ae91 /system/lib/libdvm.so (_Z18dvmOptimizeDexFileillPKcjjb) I/DEBUG ( 113): #05 eip: 000819d6 /system/lib/libdvm.so (_Z14dvmJarFileOpenPKcS0_PP7JarFileb) I/DEBUG ( 113): #06 eip: 000b175e /system/lib/libdvm.so (_ZL40Dalvik_dalvik_system_DexFile_openDexFilePKjP6JValue) I/DEBUG ( 113): #07 eip: 0011fb94 /system/lib/libdvm.so Root cause: The atfork uses the mutex handler_mutex to protect the atfork_head. The parent will call __bionic_atfork_run_prepare() to lock the handler_mutex, and need both the parent and child to unlock their own copy of handler_mutex after fork. At that time, the owner of hanlder_mutex is set as the parent. If we apply the kernel_id fix, then the child's kernel_id will be set as child's tid. The handler_mutex is a recursive lock, and pthread_mutex_unlock(&hander_mutex) will fail because the mutex owner is the parent, while the current tid (__get_thread()->kernel_id) is child, not matched with the mutex owner. At that time, the handler_mutex is left in lock state.If the child wants to fork other process after than, then it will try to lock handler_mutex, and then be deadlocked. Fix: Since the child has its own copy of vm space from the the parent, the child space's handler_mutex should be reset to the initialized state. Change-Id: I3907dd9a153418fb78862f2aa6d0302c375d9e27 Signed-off-by: Jack Ren <jack.ren@intel.com> Signed-off-by: Chenyang Du <chenyang.du@intel.com> Signed-off-by: Bruce Beare <bruce.j.beare@intel.com> Change-Id: Ic8072f366a877443a60fe215f3c00b3df5a259c8
43 lines
1.6 KiB
C
43 lines
1.6 KiB
C
/*
|
|
* Copyright (C) 2011 The Android Open Source Project
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
|
|
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef _BIONIC_PTHREAD_H
|
|
#define _BIONIC_PTHREAD_H
|
|
|
|
#include <sys/cdefs.h>
|
|
|
|
__BEGIN_DECLS
|
|
|
|
/* Internal, not an NDK API */
|
|
extern pid_t __pthread_gettid(pthread_t thid);
|
|
extern int __pthread_settid(pthread_t thid, pid_t tid);
|
|
|
|
__END_DECLS
|
|
|
|
#endif /* _BIONIC_PTHREAD_H */
|