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06065c451f
qemu/linux-user
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Peter Maydell 06065c451f linux-user: wrap fork() in a start/end exclusive section 
When we do a fork() in usermode emulation, we need to be in
a start/end exclusive section, so that we can ensure that no
other thread is in an RCU section. Otherwise you can get this
deadlock:

- fork thread: has mmap_lock, waits for rcu_sync_lock
  (because rcu_init_lock() is registered as a pthread_atfork() hook)
- RCU thread: has rcu_sync_lock, waits for rcu_read_(un)lock
- another CPU thread: in RCU critical section, waits for mmap_lock

This can show up if you have a heavily multithreaded guest program
that does a fork().

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reported-by: Stuart Monteith <stuart.monteith@linaro.org>
Message-Id: <1512650481-1723-1-git-send-email-peter.maydell@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
2018-01-23 14:20:52 +01:00
..
aarch64 linux-user: Add separate aarch64_be uname 2018-01-11 13:25:31 +00:00
alpha linux-user: Handle ERFKILL and EHWPOISON 2017-01-22 18:14:10 -08:00
arm linux-user/arm/nwfpe: Check coprocessor number for FPA emulation 2018-01-11 13:25:39 +00:00
cris linux-user: Clean up target_structs.h header guards 2016-07-12 16:19:16 +02:00
host Replace 'struct ucontext' with 'ucontext_t' type 2017-07-20 10:10:28 +01:00
hppa linux-user/hppa: Fix typo for TARGET_NR_epoll_wait 2017-11-07 21:58:13 +02:00
i386 linux-user: fix TARGET_NR_select 2016-09-22 07:24:21 +03:00
m68k linux-user: Update m68k syscall definitions to match Linux 4.6 2017-02-16 15:29:26 +01:00
microblaze linux-user: fix TARGET_NR_select 2016-09-22 07:24:21 +03:00
mips linux-user: Handle ERFKILL and EHWPOISON 2017-01-22 18:14:10 -08:00
mips64 linux-user: Handle ERFKILL and EHWPOISON 2017-01-22 18:14:10 -08:00
nios2 nios2: Add usermode binaries emulation 2017-01-24 13:10:35 -08:00
openrisc target/openrisc: implement shadow registers 2017-05-04 09:39:01 +09:00
ppc ppc: Fix signal delivery in ppc-user and ppc64-user 2016-09-23 10:29:40 +10:00
s390x linux-user: Clean up target_structs.h header guards 2016-07-12 16:19:16 +02:00
sh4 linux-user: Update sh4 syscall definitions to match Linux 4.8 2017-02-16 15:29:16 +01:00
sparc sparc: embed sparc_def_t into CPUSPARCState 2017-09-01 11:54:24 -03:00
sparc64 linux-user: sparc64: Use correct target SHMLBA in shmat() 2016-10-21 15:19:40 +03:00
tilegx linux-user: fix TARGET_NR_select 2016-09-22 07:24:21 +03:00
unicore32 linux-user: Clean up target_structs.h header guards 2016-07-12 16:19:16 +02:00
x86_64 linux-user: Fix target_semid_ds structure definition 2016-08-04 16:36:53 +03:00
elfload.c linux-user: Fix calculation of auxv length 2017-11-20 16:15:41 +02:00
errno_defs.h linux-user: Handle ERFKILL and EHWPOISON 2017-01-22 18:14:10 -08:00
flat.h
flatload.c linux-user: Fix error handling in flatload.c target_pread() 2016-09-21 14:27:19 +03:00
ioctls.h linux-user: Add some random ioctls 2017-10-16 21:00:04 +03:00
linux_loop.h linux-user: Add loop control ioctls 2016-07-19 15:22:33 +03:00
linuxload.c linux-user: Clean up includes 2016-01-29 15:07:22 +00:00
m68k-sim.c linux-user: Clean up includes 2016-01-29 15:07:22 +00:00
main.c linux-user: wrap fork() in a start/end exclusive section 2018-01-23 14:20:52 +01:00
Makefile.objs linux-user: Provide safe_syscall for fixing races between signals and syscalls 2016-05-27 14:49:51 +03:00
mmap.c linux-user: fix tcg/mmap test 2017-02-16 15:29:30 +01:00
qemu.h linux-user: Support stack-grows-up in elfload.c 2017-01-22 18:14:10 -08:00
safe-syscall.S linux-user: Provide safe_syscall for fixing races between signals and syscalls 2016-05-27 14:49:51 +03:00
signal.c linux-user: Fix endianess of aarch64 signal trampoline 2018-01-11 13:25:31 +00:00
socket.h linux-user: Add HPPA socket.h definitions 2017-01-23 09:52:39 -08:00
strace.c linux-user: fix O_TMPFILE handling 2017-10-16 16:00:56 +03:00
strace.list linux-user: add rt_tgsigqueueinfo() strace 2017-05-29 14:56:08 +03:00
syscall_defs.h linux-user: Handle TARGET_MAP_STACK and TARGET_MAP_HUGETLB 2017-11-07 21:58:13 +02:00
syscall_types.h linux-user: Add FICLONE and FICLONERANGE ioctls 2017-02-16 15:29:30 +01:00
syscall.c linux-user: Handle rt_sigaction correctly for SPARC 2017-11-07 21:59:51 +02:00
target_flat.h
trace-events trace-events: fix code style: print 0x before hex numbers 2017-08-01 12:13:07 +01:00
uaccess.c util: move declarations out of qemu-common.h 2016-03-22 22:20:17 +01:00
uname.c linux-user: Clean up includes 2016-01-29 15:07:22 +00:00
uname.h Clean up decorations and whitespace around header guards 2016-07-12 16:20:46 +02:00
vm86.c linux-user: Clean up includes 2016-01-29 15:07:22 +00:00